Method of approximating temperature field of working medium in full-sized installation

FIELD: physics.

SUBSTANCE: invention relates to methods of controlling coolant of a nuclear reactor and can be used for approximating temperature field of working medium in heat exchangers and reactors. In the proposed method required local mass flow of a tracer in the working medium is determined after each elementary area at the inlet of the working section. The tracer is successively let into each elementary area at the inlet of the working section. An air sample is taken at the outlet of the working section and local concentrations of the tracer at the outlet of the working section are measured, corresponding to inlet of the tracer into different elementary areas at its inlet. Standardised local concentrations of the tracer at the outlet of the working section are added and the resultant local concentrations are obtained. The unknown local temperature of the working medium at the outlet of a full-sized installation is determined from an approximate relationship, which takes into account the ratio of the linear scale of the working section with respect to the full-sized installation, complete heat flow at the inlet of the full-sized installation, flow of the tracer at the inlet and concentration of the tracer at the outlet of the working section, specific heat capacity of the working medium at the outlet of the full-sized installation, density and average speed of the working medium at the outlet of the full-sized installation and working section.

EFFECT: wider functional capabilities, increased accuracy, reduced labour input for determining temperature field at the outlet of a full-sized installation.

9 cl, 4 dwg

 

The invention relates to measuring technique and can be used to determine the temperature field of the working environment in natural settings, such as running parts of the heat exchangers and reactor pressure vessels.

There is a method of study of the mixing of the coolant flowing in the parts collecting systems [Cabrinovic B.N., Delnov NR. Study of the mixing of the coolant in the distributing manifold systems quick and VVER reactors / Nuclear power. T. Vol.5. November 1994 S-344].

The method includes the inlet of the tracer in the stream of air flowing in the portion of the work area through one of the input sockets and check the concentration of tracer at the outlet of the flow part of the experimental plot using programmirovanie leak detector.

The disadvantages of this method are as follows:

- there is no ratio that allows the recalculation of the relative concentrations of the tracer in temperature values;

- it is not possible to determine other (arbitrary) field temperature of the working medium at the outlet of the flow part of field installation without additional research on-site;

is not taken into account the local physical properties of the working environment in the flowing part full-scale installation and site.

The closest technical re is the group of the claimed method is a method of determination of temperature fields in the flow part of the work area, considered in [Levchenko UD Hydrodynamics channel heat exchangers for nuclear power plants // Thesis for the degree of doctor of technical Sciences. SSC RF-IPPE, Obninsk, 1991, 526 S. Section 2.4. Hydrodynamic modeling of the collector nuclear reactor VG-400. P.88-99].

The known method includes the continuous and simultaneous input of gaseous tracer on all selected elemental areas of the input section in isothermal flow of air sampling from a stream of air at the outlet of the flow part of the experimental plot, feed samples were taken in the analysis of samples, analysis of samples, determination of the concentration of tracer in the air flow, the determination of the local temperature in the flowing part full-scale installation in the approximate ratios linking the local temperature of the coolant at the outlet of the flow part of the full-scale installation with a relative concentration of tracer in the air stream flowing part of the work area, maximum and minimum temperatures at the flow inlet flow part full-scale installation.

The disadvantages of this method are:

the relatively high complexity of determining the temperature of the working medium at the outlet of the flow part of the full-scale installation associated with required the capacity of simultaneous input of tracer in the characteristic point at the entrance to the flowing part of the work area with a given concentration (expense) of the tracer;

- limited region of obtaining data for analysis of various types of temperature fields at the entrance to the flowing part full-scale installation;

- the lack of definition of some (arbitrary) field temperature of the working medium at the outlet of the flow part of field installation without additional research on-site;

- not taking into account the local physical properties of the working medium flowing in parts of the field installation and working of the site;

- the relatively low accuracy of determination of the temperature field at the outlet of the flow part of field installation due to the significant complexity of the structures of the devices used by a known method for determining the temperature for the simultaneous input of tracer into all the typical area of the input section of the work area and in this regard, the possible disturbing effects of input devices on the velocity field and the possible mutual influence of the supply lines of tracer in the experimental selection of the required field of concentration.

The proposed method eliminates the mentioned disadvantages, namely:

- consider the impact of the physical properties of the working medium flowing in parts of the field installation and the work area on the designated field outlet temperature of the flowing part full-scale installation;

to obtain the temperature field navyhode from flowing part full-scale installation in various fields of temperature at the entrance of her flowing part without additional tests of the work area;

more accurately reproduce the input stream part of the work area, the local costs of the tracer, the corresponding field of the local heat fluxes in the natural working environment at the entrance to the flowing part full-scale installation.

To eliminate these disadvantages in the method for the approximate determination of the temperature field of the working environment in a natural setting, including continuous intake of gaseous tracer into the flow of inlet air in the flowing part of the work area, the sampling of the air flow at the outlet of the flow part of the work area, feed samples were taken in the analysis of samples, analysis of samples, the measurement of the concentration of tracer in the air stream at the outlet of the flow part of the work area, the determination of the local temperature of the working medium at the outlet of the flow part of the full-scale installation on the approximate value features:

- to specify an arbitrary value of the dimension proportionality coefficient representing the ratio of the total heat flux at the entrance to the flowing part full-scale installation to technologically possible full the mass flow of tracer at the inlet in the flow part of the work area;

- to determine the necessary local mass flows of the tracer in the working environment through each elemental area at the entrance flow is part of the work area;

- tracer with arbitrarily specified local mass flow alternately to let in every elementary Playground at the entrance to the flowing part of the work area;

- to measure the local concentration of the tracer at the outlet of the flow part of the work area corresponding to the inlet of the tracer in various elementary Playground at the entrance to the flowing part of the work area;

- measured local concentrations of the tracer at the outlet of the flow part of the work area, corresponding to different locations of the inlet of the tracer at the inlet in the flow part of the work area, normalization by multiplying by a factor equal to the ratio of required and arbitrarily specified expenses of the tracer through the elementary Playground at the entrance to the flowing part of the work area;

normalized local concentration of tracer, in relation to each characteristic point at the outlet of the flow part of the work area, to sum up and to get the resulting local concentration of the tracer in the unit area at the outlet of the flow part of the work area;

- desired local temperature of the working medium at the outlet of the flow part of the full-scale installation to determine the approximate value considering the linear scale of the flow part of the work area relative to the flowing part full-scale installation, complete aloway the input flow field installation technologically possible total mass flow rate of tracer at the inlet in the flow part of the work area, resulting normalized local concentration of the tracer in the unit area at the exit of the work area, specific heat, density and the average velocity of the working medium at the outlet of the flow part of the full-scale installation, the density and the average velocity of the working medium at the outlet of the flow part of the work area.

In private cases, the implementation of the method features:

- full heat flow at the entrance to the flowing part full-scale installation to determine the ratio, taking into account the specific heat of the working medium at its average temperature, total mass flow rate and the average temperature of the working environment;

- local mass flow rate of tracer in the working environment through each elemental area at the entrance to the flowing part of the work area to determine the ratio, taking into account technologically possible total mass flow rate of tracer at the inlet in the flow part of the work area, full heat flow at the entrance to the flowing part full-scale installation, specific heat, density, velocity and temperature of the working environment in the elementary Playground at the entrance to the flowing part full-scale installation, as well as the area of this elementary playgrounds;

as Tr is sera to use gaseous halide tracer or gaseous hydrocarbons;

- the local velocity of the working medium at the inlet in the flow part of the work area and (or) on the exit to determine experimentally, as a result of calculations and (or) to set as a constant value;

- field temperatures at the entrance to the flowing part full-scale installation to determine the result of calculations or set as source data;

- similarity of the velocity fields of the working medium at the inlet in the flow-through portion and at the outlet of the flow part of the work area and field installation to provide due to the geometrical similarity of their flow passages or by affecting the flow devices, such as guide devices, gratings;

- supplying of the tracer in the flow of the working environment of the work area, the mass flow rate of tracer to be kept constant at an arbitrary level sufficient to obtain field measured concentrations at the outlet of the flow part with definable error.

The technical result consists in extending the functionality of the method of improving accuracy, reducing costs and complexity determine the temperature field at the outlet of the flow part of the full-scale installation.

Method for the approximate determination of the temperature field of the working environment in a natural setting is as follows.

Set an arbitrary value of the size ratio property is ture, represents the ratio of the total heat flux at the entrance to the flowing part full-scale installation to technologically possible full the mass flow of tracer at the inlet in the flow part of the work area.

Define the required local mass flows of the tracer in the working environment through each elemental area at the entrance of the flow part of the work area.

In the air flow in each elementary area at the entrance to the flowing part of the work area continuously and alternately admit the tracer with arbitrarily specified local mass flow.

At the outlet of the flow part of the work area of the air flow taken a sample, submit it to the analysis of the samples, analyze the selected sample and measure the local concentration of the tracer corresponding to the inlet of the tracer in various elementary Playground at the entrance to the flowing part of the work area.

Measured local concentrations of the tracer at the outlet of the flow part of the work area, corresponding to different locations of the inlet of the tracer at the inlet in the flow part of the work area, normalized by multiplying by normalizing factor equal to the ratio required and arbitrarily specified expenses of the tracer through the elementary Playground at the entrance to the flowing part of the work area.

The normalized local concentration is AI tracer, related to each characteristic point at the outlet of the flow part of the work area, summarize and get the resulting local concentration of the tracer in the unit area at the outlet of the flow part of the work area.

The desired local temperature of the working environment in each characteristic point at the outlet of the flow part of the full-scale installation to determine the approximate value

where T is the desired local temperature of the working environment; And - the linear scale of the flow part of the work area relative to the flowing part full-scale installation; Q - full heat flow, j; G is technologically possible total mass flow rate of tracer, kg/s;resultant set of local normalized concentration of the tracer; Cp- specific heat of the working environment, j/(kg·K); ρ is the density of the working environment, kg/m3; W is the average velocity of the working medium, m/s; superscripts "n" and "p" correspond to full-scale installation and job site; subscripts "1" and "2" correspond to the characteristics of the working medium in the inlet and outlet flow passages of field installation and working of the site; subscripts "i" and "j" correspond to the numbers of elementary platforms at the entrance to the flowing part of the work area and the rooms basic sites at the outlet of the flow cha the TEI working area and on-site installation.

Special cases of the method are as follows.

Full heat flow at the entrance to the flowing part of the field set as source parameter or determined by the ratio

where Q is full heat flow, j/s; withp- specific heat of the working medium at its average temperature, j/(kg·K)M - full mass flow rate, kg/s; T is the average temperature of the working environment, To; the Superscript "h" corresponds to full-scale installation; the lower the index "1" corresponds to a production environment in-situ installation.

Local mass flow rate of tracer in the working environment through each elemental area at the entrance to the flowing part of the work area is determined by the value

where- local mass flow rate of the tracer through the elementary Playground at the entrance flow part of the work area, kg/s; Q - full heat flow, j/s; G is the full mass flow rate of tracer, kg/s; withp- specific heat of the working environment, j/(kg·K); ρ is the density of the working environment, kg/m3; W is the local velocity of the working medium, m/s; T is the local temperature of the working environment, To; Δs is the area of elementary playgrounds, m2; superscripts "n" and "p" correspond to full-scale installation and job site; the subscript "1 which corresponds to the characteristics of the working medium at the inlet flow passages full-scale installation and working area.

As tracer using gaseous halide tracer or gaseous hydrocarbon.

The local velocity of the working medium at the inlet in the flow part of the work area and / or the exit is determined experimentally, as a result of calculations and (or) set as a constant value.

Field temperatures at the entrance to the flowing part full-scale unit is determined as a result of calculations or set as source data.

The similarity of the velocity fields of the working medium at the inlet in the flow-through portion and at the outlet of the flow part of the work area and field units provide due to the geometrical similarity of their flow passages or by affecting the flow devices, such as guide devices, arrays.

When the cart of the tracer in the flow of the working environment of the work area, the mass flow rate of tracer maintain a constant to an arbitrary level that is sufficient to obtain field measured concentrations at the outlet of the flow part with definable error.

An example of a specific implementation of the method.

Characteristics of full-scale installation

Full-scale installation - high temperature gas reactor (HTGR). Collector Assembly HTGR includes a lattice of the lower reflector, the shading elements flowing part of the collapsible reservoir and four branch pipe.

Characteristics of rotocol part of field position: ;;

,- communicating sections at the entrance to the flow-through portion and the output of a flowing part full-scale installation, respectively, m2. The output of the flow part - 4 output pipe with bushing sections 1×1.4 m2each.

Initial data on the working environment in-situ installation:

Mn=340 kg/s (full mass flow rate of helium);;;.

Full heat flow through the flow-through portion of the collapsible reservoir was determined by the ratio (2). In the calculation result received:

The average speed of the gas flow at the entrance into a collecting reservoir was determined by the formula. In the calculation result received:.

The average speed of the gas flow at the outlet of precast collector was determined by the formula. In the calculation result received:.

After helium precast collector SVBR through the 4 output socket.

Figure 1 shows the radial temperature profile in the inlet section of the flow part precast collector HTGR, figure 2 - radial profile of the relative velocity in the inlet section of the flow is Asti precast collector HTGR, where r is the radial coordinate, R is the maximum radius of the entrance section of the collapsible reservoir. Figure 3 given the profile of the relative velocity height (bottom to top) section of the outlet pipe flow part precast collector HTGR. Figure 1-3 designation <W> corresponds to the average flow velocity of the working environment.

Characteristics of the work area

The liquid part of the working area is made geometrically similar flow part precast collector HTGR in the scale of 1:5. Accordingly, in the formula (1) coefficient A=0,2..

Characteristics of the working environment in the flowing part of the work area:; Mp=5,75 kg/s (mass air flow).

The average speed of air flow at the outlet of the flow part of the work area was determined by the formula. In the calculation result received:.

Working medium : air. Gaseous tracer - propane.

The air temperature in the working area was held constant in technologically acceptable range so as not to take into account the effect of temperature on air density.

The profile of the relative velocity in the inlet section of the flow part of the work area, similar to the one presented in figure 2 was created using a profiling grid.

Developed turbulence, the second current and the geometric similarity of the flowing parts of the field collector and the work area provided the same profile as the relative velocities of helium and air in the outlet pipes. The influence of natural convection on the velocity profile in the flow part of field collector is negligible.

The implementation method for the approximate determination of the temperature field

The number of elementary areas, which were divided input section precast collector field installation and working of the site, was equal to 5×6=30. Of these 5 sites in the radial direction, 6 - in azimuth. This radius was divided into 5 equal parts, angles in the azimuth direction was the same and equal to π/3.

Plan precast collector HTGR and arrangement of elementary platforms at the entrance to the flowing part full-scale installation are given in figure 4.

Technologically possible total mass flow rate of tracer - propane through all the elementary areas of the work area was set equal. This propane consumption was sufficient when using a cylinder with liquefied gas without charge exchange during the entire testing of the work area and corresponded to obtain an average mass concentration of propane in the air flow in the working section at the level of 10-4. This level concentrations of propane is in the range of concentrations measured by the gas chromatograph Model 3700.

The value of the ratio of total thermal input flow in the flowing part of the precast collector HTGR to complete the mass is at the expense of propane inlet flow portion of the work area, which is a dimensional coefficient of proportionality in determining the local mass flow rates of the tracer in the working environment through each elemental area at the entrance to the flowing part of the work area, equal to.

Local mass flow rate of tracer in the working environment through each elemental area at the entrance to the flowing part of the work area, are presented in table 1, was determined by the ratio (3) using the original data presented in figure 1-3:

In table 1 the ratio of necessary and arbitrarily preset flow rate of the traceris a normalizing coefficient. The mass flow rate of the tracer through each of the elementary sites were maintained constant over time.

When calculating the elementary sitestake into account salesgenie passing the input section of the collector support columns and outlet pipes.

The mass flow rate of intake air flowing in the portion of the work area and at the exit provided constant over time.

The measurement of the concentration of propane in air flow performed by a gas chromatograph.

In the air flow in each elementary area at the entrance to running frequent the work area continuously and alternately let the propane with arbitrarily specified local mass flow. In this example of the method for the mass flow of propane through each of the elementary sites were asked the same and equal to. Increased consumption of propane was chosen to increase the accuracy of measurement of the concentration of propane in the air flow in the working section.

In characteristic points of the cross-section at the outlet of the flow part of the work area of the air flow, a sample was taken, lodged in system analysis samples were analyzed selected samples and measured local concentrations of propane using a gas chromatograph corresponding to the inlet of the tracer in various elementary Playground at the entrance to the flowing part of the work area.

Characteristic points at the outlet of the flow part precast collector HTGR was a point in the lower and upper parts of the pipes with coordinates y/H=0.05 and y/H=0,95. Here the coordinate "y", calculated from the lower surface of the nozzle up to the height "H". The temperatures at these points it is possible to judge the degree of mixing of the fluid in the collapsible reservoir HTGR. In this example, because of the symmetry in terms of the flow part of the collapsible reservoir and the uniformity of the output nozzles describes the results of measurements of concentrations of propane in the characteristic points of the 3rd socket (see figure 4).

Measured local concentrations of propane at the output of the C flow part of the work area, corresponding to different locations of the inlet propane inlet flow portion of the work area, normalized by multiplying by normalizing factor equal to the ratio required and arbitrarily specified costs of propane through elementary Playground at the entrance to the flowing part of the work area.

Normalized measured local concentrations of propane in the characteristic points of the 3rd of the outlet pipe are given in table 2. Due to the symmetric geometry of the work area values measured local concentrations of propane, obtained from the input of the tracer in the elementary symmetric sites, were averaged.

The normalized local concentration of propane related to each characteristic point at the outlet of the flow part of the work area, were summed up and defined the resulting normalized local concentration of propane in the unit area at the outlet of the flow part of the work area.

Table 2
The local values of the normalized concentrations of propane in the characteristic points of nozzle No. 3 of the work area
№ p/pi
151, 5600
241, 4600
331, 3600
421, 266,694,96
511, 164,533,36
612, 159,036,69
722, 2515,511,5
832, 352,822,09
942, 451,891,40
1052, 5500
1113, 1411,3837
1223, 2444,633,0
1333, 3470,552,2
1443, 4413187,2
1553, 54281208

In the outlet pipes of field installation and the working area of the field relative velocities of the working environment are the same. The desired local temperature of the working medium at the outlet of the flow part of the full-scale installation was determined according to the approximate relation (1). In the calculation result received:

Table 2 shows the resulting local normalized value of the measured concentrations of propane in the characteristic points of the 3rd output socket.

Substituting them into the formula (4), received the resulting temperature characteristic points in the outlet port field installation:

;

These results are confirmed by calculations based on the numerical simulation of teplogidravlike flow of helium in the flowing part of the prefab to the of lectora HTGR.

Feasibility of the method for the approximate determination of the temperature field of the working environment in-situ installation.

1. Method for the approximate determination of the temperature field of the working environment in a natural setting, including continuous intake of gaseous tracer into the flow of inlet air in the flowing part of the work area, the sampling of the air flow at the outlet of the flow part of the work area, feed samples were taken in the analysis of samples, analysis of samples, the measurement of the concentration of tracer in the air stream at the outlet of the flow part of the work area, the determination of the local temperature of the working medium at the outlet of the flow part of the full-scale installation on the approximate value, wherein the set arbitrary value of the dimension proportionality coefficient representing the ratio of the total heat flux on the entrance to the flowing part full-scale installation to technologically possible full the mass flow of tracer at the inlet in the flow part of the work area, define the required local mass flows of the tracer in the working environment through each elemental area at the entrance of the flow part of the work area, the tracer with arbitrarily specified local mass flow alternately admitted in each elementary Pasadena the entrance of the flow part of the work area, measure the local concentration of the tracer at the outlet of the flow part of the work area corresponding to the inlet of the tracer in various elementary Playground at the entrance to the flowing part of the work area, measured local concentrations of the tracer at the outlet of the flow part of the work area, corresponding to different locations of the inlet of the tracer at the inlet in the flow part of the work area, measured local concentrations of the tracer at the outlet of the flow part of the work area, corresponding to different locations of the inlet of the tracer at the inlet in the flow part of the work area, normalized by multiplying by normalizing factor equal to the ratio required and arbitrarily specified expenses of the tracer through the elementary Playground at the entrance to the flowing part the work area, normalized to the local concentration of tracer, in relation to each characteristic point at the outlet of the flow part of the work area, summarize and get the resulting normalized local concentration of the tracer in the unit area at the outlet of the flow part of the work area, and the desired local temperature of the working medium at the outlet of the flow part of the full-scale unit is determined according to the approximate ratio

where T is the desired local temperature of the working environment, To;
A - line, the initial scale of the flow part of the work area relative to the flowing part full-scale installation;
Q - full heat flow, j/s;
G - technologically possible total mass flow rate of tracer, kg/s;
With the resultant set of local normalized concentration of the tracer;
withp- specific heat of the working environment, j/(kg·K);
ρ is the density of the working environment, kg/m3;
W is the average velocity of the working medium, m/s;
superscripts "n" and "p" correspond to full-scale installation and job site; subscripts "1" and "2" correspond to the characteristics of the working medium in the inlet and outlet flow passages of field installation and working of the site; subscripts "i" and "j" correspond to the numbers of elementary platforms at the entrance to the flowing part of the work area and the rooms basic sites at the outlet of the flowing parts of the work area and field installation.

2. The method according to claim 1, characterized in that the total heat flux at the entrance to the flowing part full-scale unit is determined by the ratio

where Q is full heat flow, j/s;
withp- specific heat of the working medium at its average temperature, j/(kg·K);
M - full mass fluid flow, kg/s;
T - average temperature of the working environment, To;
the Superscript "h" corresponds to full-scale installation;
the lower the index "1" corresponds to a production environment in-situ installation.

3. The method according to claim 1, characterized in that n is necessary, the local mass flow rate of tracer in the working environment through each elemental area at the entrance to the flowing part of the work area is determined by the ratio

where- local mass flow rate of the tracer through the elementary Playground at the entrance to the flowing part of the work area, kg/s;
G - technologically possible total mass flow rate of tracer, kg/s;
Q - full heat flow, j/s;
withp- specific heat of the working environment, j/(kg·K);
ρ is the density of the working environment, kg/m3;
W is the local velocity of the working medium, m/s;
T is the local temperature of the working environment, To;
Δs is the area of elementary playgrounds, m2;
superscripts "n" and "p" correspond to full-scale installation and job site; the lower the index "1" corresponds to the characteristics of the working medium at the inlet flow passages full-scale installation and working area.

4. The method according to claim 1, characterized in that as the tracer using gaseous halide tracer or gaseous hydrocarbon.

5. The method according to claim 1, characterized in that the local velocity of the working medium at the inlet in the flow part of the work area and / or the exit is determined experimentally, as a result of calculations and (or) set as a constant value.

6. The method according to claim 1, characterized in that the temperature at the entrance to the flowing part full-scale unit is determined as a result of calculations or set as source data.

7. The method according to claim 1, ex is different, however, the similarity of the velocity fields of the working medium at the inlet in the flow-through portion and at the outlet of the flow part of the work area and field units provide due to the geometrical similarity of their flow passages or by affecting the flow devices, for example, the guide devices, arrays.

8. The method according to claim 1, characterized in that the supplying of the tracer in the flow of the working environment of the work area, the mass flow rate of tracer maintain a constant to an arbitrary level that is sufficient to obtain field measured concentrations at the outlet of the flow part with definable error.



 

Same patents:

FIELD: physics; measurement.

SUBSTANCE: present invention relates to a system of taking samples from the atmosphere of a reactor containment of a nuclear process installation and a method of obtaining such a sample. The system of taking samples contains a pipe for taking samples, which enters the reactor containment and is connected to a low pressure system and an analysis system. There is a throttling device in front of the pipe for taking samples on the side of the gas, where it connects to the atmosphere in the reactor containment. The pipe for taking samples is a small pipe with nominal inner diametre of up to 15 mm, and is preferably in form of a capillary pipe with nominal inner diametre between 1 mm and 5 mm. When implementing the method of taking samples, low pressure is created in the pipe for taking samples, compared to pressure in the reactor containment. After the sample enters the pipe for taking samples, pressure in the pipe is limited.

EFFECT: possibility of taking a sample, suitable for taking exceptionally reliable and accurate measurement values.

22 cl, 3 dwg

FIELD: physics; nuclear power.

SUBSTANCE: invention is intended for the control of tightness of steam and gas generators of ship nuclear engine installation on the stopped reactor, both at stationary pressure, and at carrying out of hydraulic trials. The method of tightness control of steam and gas generators of the ship nuclear engine installation with the water heat transfer medium under pressure includes sampling from each prestressly drained steam and gas generator on the stopped reactor and measuring of the content of tritium with the subsequent calculation of leaking quantity. Samplings of air moisture are performed from the pipe system of each steam and gas generator. Then tritium content in air of the pipe system of each steam and gas generator is determined. Before sampling, additional removal of water from pipelines of a contour of circulation of the drained steam and gas generators is performed. Sampling of moisture of air and determination of tritium content in air is performed with an interval of 24-48 hours.

EFFECT: increase of sensitivity of control method, possibility of earlier detection of steam and gas generator leakiness and possibility of determination quantity of leaking of the heat transfer medium of the first contour in specific steam and gas generator.

2 cl

FIELD: measuring devices, metallurgy.

SUBSTANCE: ultrasonic measuring converter contains a unit which consists of an ultrasonic generator and an oscillations transmitting block; it is designed to direct ultrasonic waves into a liquid metal through the oscillations transmitting block and to receive ultrasonic waves passing through a liquid metal. The oscillations transmitting block can include a wave guide component located near the ultrasonic generator and a moistened component contacting with a liquid metal. The moistened component or the whole oscillations transmitting block are made out of ferrite stainless steel, of aluminium alloy, with contents of aluminum of 70% or more, or out of copper alloy with contents of copper 50% or more.

EFFECT: upgraded accuracy of measurements due to increased ratio of acoustic pressure transmission owing to optimisation of acoustic relation in a moistened border of a division.

6 cl, 12 dwg

FIELD: technological processes.

SUBSTANCE: invention is related to highly efficient liquid medium with distributed nanoparticles for cooling of nuclear reactor as main material, with which the nanoparticles are mixed, to method and device for preparation of liquid medium and to method of liquid medium leak detection. Highly efficient liquid medium is a liquid natrium as the main material, in which the previously treated nanoparticles are evenly distributed for removal of oxide film on surfaces of nanoparticles. As nanoparticles, at least superfine nickel particles are used in the quantity of at least 10 million-1. The methods of condition creation were developed, in which the nanoparticles do not have the oxide film on their surface. First, by removal of oxide film prior to mixing of nanoparticles with liquid natrium in atmosphere of hydrogen gas. Second, by removal of oxide film by means of addition and shaking of oxygen absorber before or after nanoparticles addition to liquid natrium. Third, by coating of nanoparticles surface with natrim atoms prior to creation of oxide film on their surface with the help of device, which consists of evaporating chamber, chamber of molecular beam and collector chamber, which are successively connected with each other. The prepared alternative liquid medium possesses high working characteristics at low cost.

EFFECT: addition of nanoparticles to mentioned liquid medium leads to sharp increase of light brightness.

20 cl, 9 dwg

FIELD: nuclear power engineering; shipboard nuclear power plants.

SUBSTANCE: proposed method for checking core of shipboard water-cooled nuclear power plant for condition includes measurement of reference-radionuclide specific beta-activity in primary coolant samples taken from running reactor followed by evaluation of core condition. Sample for evaluating core condition is taken downstream of ion-exchange filter under any operating conditions of reactor. Used as reference radionuclide is tritium. Such method makes it possible to check reactor core for condition under any of its operating conditions, including shutdown condition.

EFFECT: reduced dose rate suffered by attending personnel under poor tightness condition of cans.

2 cl

The invention relates to measuring technique and can be used to determine flow rates in the channels of nuclear power plants in the measurement of flow through turbine flowmeters of various types

The invention relates to the field of radiochemical analysis

The invention relates to channel nuclear reactors, in particular to a device for controlling flow of water coolant in the first circuit channel of a nuclear reactor RBMK series

The invention relates to a method and apparatus for obtaining liquid samples from the emergency protective shell of the reactor of a nuclear power plant using the sampling vessel

FIELD: nuclear power engineering; shipboard nuclear power plants.

SUBSTANCE: proposed method for checking core of shipboard water-cooled nuclear power plant for condition includes measurement of reference-radionuclide specific beta-activity in primary coolant samples taken from running reactor followed by evaluation of core condition. Sample for evaluating core condition is taken downstream of ion-exchange filter under any operating conditions of reactor. Used as reference radionuclide is tritium. Such method makes it possible to check reactor core for condition under any of its operating conditions, including shutdown condition.

EFFECT: reduced dose rate suffered by attending personnel under poor tightness condition of cans.

2 cl

FIELD: technological processes.

SUBSTANCE: invention is related to highly efficient liquid medium with distributed nanoparticles for cooling of nuclear reactor as main material, with which the nanoparticles are mixed, to method and device for preparation of liquid medium and to method of liquid medium leak detection. Highly efficient liquid medium is a liquid natrium as the main material, in which the previously treated nanoparticles are evenly distributed for removal of oxide film on surfaces of nanoparticles. As nanoparticles, at least superfine nickel particles are used in the quantity of at least 10 million-1. The methods of condition creation were developed, in which the nanoparticles do not have the oxide film on their surface. First, by removal of oxide film prior to mixing of nanoparticles with liquid natrium in atmosphere of hydrogen gas. Second, by removal of oxide film by means of addition and shaking of oxygen absorber before or after nanoparticles addition to liquid natrium. Third, by coating of nanoparticles surface with natrim atoms prior to creation of oxide film on their surface with the help of device, which consists of evaporating chamber, chamber of molecular beam and collector chamber, which are successively connected with each other. The prepared alternative liquid medium possesses high working characteristics at low cost.

EFFECT: addition of nanoparticles to mentioned liquid medium leads to sharp increase of light brightness.

20 cl, 9 dwg

FIELD: measuring devices, metallurgy.

SUBSTANCE: ultrasonic measuring converter contains a unit which consists of an ultrasonic generator and an oscillations transmitting block; it is designed to direct ultrasonic waves into a liquid metal through the oscillations transmitting block and to receive ultrasonic waves passing through a liquid metal. The oscillations transmitting block can include a wave guide component located near the ultrasonic generator and a moistened component contacting with a liquid metal. The moistened component or the whole oscillations transmitting block are made out of ferrite stainless steel, of aluminium alloy, with contents of aluminum of 70% or more, or out of copper alloy with contents of copper 50% or more.

EFFECT: upgraded accuracy of measurements due to increased ratio of acoustic pressure transmission owing to optimisation of acoustic relation in a moistened border of a division.

6 cl, 12 dwg

FIELD: physics; nuclear power.

SUBSTANCE: invention is intended for the control of tightness of steam and gas generators of ship nuclear engine installation on the stopped reactor, both at stationary pressure, and at carrying out of hydraulic trials. The method of tightness control of steam and gas generators of the ship nuclear engine installation with the water heat transfer medium under pressure includes sampling from each prestressly drained steam and gas generator on the stopped reactor and measuring of the content of tritium with the subsequent calculation of leaking quantity. Samplings of air moisture are performed from the pipe system of each steam and gas generator. Then tritium content in air of the pipe system of each steam and gas generator is determined. Before sampling, additional removal of water from pipelines of a contour of circulation of the drained steam and gas generators is performed. Sampling of moisture of air and determination of tritium content in air is performed with an interval of 24-48 hours.

EFFECT: increase of sensitivity of control method, possibility of earlier detection of steam and gas generator leakiness and possibility of determination quantity of leaking of the heat transfer medium of the first contour in specific steam and gas generator.

2 cl

FIELD: physics; measurement.

SUBSTANCE: present invention relates to a system of taking samples from the atmosphere of a reactor containment of a nuclear process installation and a method of obtaining such a sample. The system of taking samples contains a pipe for taking samples, which enters the reactor containment and is connected to a low pressure system and an analysis system. There is a throttling device in front of the pipe for taking samples on the side of the gas, where it connects to the atmosphere in the reactor containment. The pipe for taking samples is a small pipe with nominal inner diametre of up to 15 mm, and is preferably in form of a capillary pipe with nominal inner diametre between 1 mm and 5 mm. When implementing the method of taking samples, low pressure is created in the pipe for taking samples, compared to pressure in the reactor containment. After the sample enters the pipe for taking samples, pressure in the pipe is limited.

EFFECT: possibility of taking a sample, suitable for taking exceptionally reliable and accurate measurement values.

22 cl, 3 dwg

FIELD: physics.

SUBSTANCE: invention relates to methods of controlling coolant of a nuclear reactor and can be used for approximating temperature field of working medium in heat exchangers and reactors. In the proposed method required local mass flow of a tracer in the working medium is determined after each elementary area at the inlet of the working section. The tracer is successively let into each elementary area at the inlet of the working section. An air sample is taken at the outlet of the working section and local concentrations of the tracer at the outlet of the working section are measured, corresponding to inlet of the tracer into different elementary areas at its inlet. Standardised local concentrations of the tracer at the outlet of the working section are added and the resultant local concentrations are obtained. The unknown local temperature of the working medium at the outlet of a full-sized installation is determined from an approximate relationship, which takes into account the ratio of the linear scale of the working section with respect to the full-sized installation, complete heat flow at the inlet of the full-sized installation, flow of the tracer at the inlet and concentration of the tracer at the outlet of the working section, specific heat capacity of the working medium at the outlet of the full-sized installation, density and average speed of the working medium at the outlet of the full-sized installation and working section.

EFFECT: wider functional capabilities, increased accuracy, reduced labour input for determining temperature field at the outlet of a full-sized installation.

9 cl, 4 dwg

FIELD: nuclear engineering.

SUBSTANCE: invention relates to devices designed to cut cores from well walls or channels and can be used in nuclear engineering to cutting graphite cores from channel-type uranium-graphite reactor lining. Proposed device comprises bearing rod with rotary drive, tubular cutter, and tubular cutter rotation-and-feed mechanism. The latter consists of drive bevel gear interacting with hollow gear shaft and fixed sleeve with outer thread arranged inside said hollow gear shaft. Note here that tubular cutter represents a sleeve with inner thread screwed on aforesaid fixed sleeve.

EFFECT: ease of cutting complete cores over entire width of graphite block at 90° to block location without using whatever means capable of destructing or fouling cores.

2 dwg

FIELD: power industry.

SUBSTANCE: invention is intended for determining thermal hydraulic characteristics (THC) along section of assembly and can be used for determining parametres of single-, double-phase flows in heat-producing assemblies of various purpose. A cell is taken in the check section of the assembly; difference of static pressures is measured till sample cell is formed on the wall of channel and on simulator of fuel elements on the side of cell under investigation. Sample cell is formed in check section by installing a sampler into the cell under investigation, which is identical as to the shape to the cell under investigation; difference of static pressures is measured after sample cell is formed. Sampling tube is connected to sample cell; pressure drop is measured between sample cell in check section and sampling section. Heat carrier is taken through the sampling tube, and THC are measured in the taken sample. At that, check section of assembly is chosen outside its active part, sample cell is pre-formed by installing a grid, and as the parametre characterising the cell state before and after sample cell is formed and sampling tube is connected, there used is total pressure in the cell centre.

EFFECT: improving measurement accuracy of thermal hydraulic characteristics along section of heat-producing assembly.

9 dwg

FIELD: physics.

SUBSTANCE: proposed device comprises one vacuum chamber separated from controlled medium by hydrogen-permeable membrane and communicated with vacuum magneto-charged pump, as well as extra vacuum chamber separated from medium by hydrogen-permeable membrane and communicated with vacuum metre. Vacuum gate is connected between main and extra vacuum chambers. Controlled medium is fed to vacuum chambers by incoming flow head. Recuperator is used for heating purposes. Hydrogen concentration in circuit is controlled is performed by intermittent comparison of magneto-charged pump current readings with those of vacuum metre.

EFFECT: uptightness control in initial period.

2 cl, 2 dwg

FIELD: power industry.

SUBSTANCE: in-core control and protection system of reactor zone of WWPR includes direct charging detectors (DCD) and thermoelectric converters (TEC), which are combined into assemblies of in-core detectors (AICD), information-measuring devices (IMD). AICD are arranged in reactor core so that near each fuel assembly in the area not exceeding three cross dimensions of fuel cluster there are three to six AICD. Information-measuring devices have measuring accuracy of signals of AICD detectors, which does not exceed 0.05%. Information-measuring devices have the possibility of correcting the DCD received signals. Number of racks of information-measuring devices corresponds to the number of channels of reactor protection system. DCD include neutron flux detectors, thermoelectric converters (TEC) and temperature detectors.

EFFECT: invention allows providing the protection of nuclear reactor core in compliance with normative documents.

Up!