SU1362229A1 - Device for measuring gas pressure in fuelcells of nuclear reactors - Google Patents

Abstract

The invention relates to a measurement technique and allows shortening the time for measuring pressure. The press-up mechanism of the device is made as a base 9 with detachable tightened cradles 6 for mounting on a fuel rod 2. Based on 9, along the axis of the crates 6, a thermal receiver from differentially included thermocouples 4 and 5 and a heater 1 in the form of metal foil are placed. The clamping force of thermoelements 4 and 5 to the cladding of the fuel element 2 is determined by the rigidity of T1RUZHIP 8. With the help of heater 1, the cladding is heated. The time dependence of the signal from thermoelements 4 and 5 is recorded, from which the gas pressure inside the fuel element 2 is determined. 2 nl. with CO CD K tsD CO tpus.1

Description

1 obrc 1 eL1 (7 O spnGy.h to u) meri-7-sl1, its technical equipment, namely, ugtroyg.t lm for the player}} date of gas n o6: iy4CH, rx tvels .x dr. I jenKTopoiJ I conditions are 7.

| ELT) of the invention of the invention with the ppeMPFiH hype.

FIG. 1 iso Prazti the proposed device for determining the pressure of gas in fuel rods, a general view; in fig. 2 - its structural scheme.

The device contains a heater 1 made in the form of a metal foil bent in the form of a Twel shell 2 with elastic current 3; the first thermal receiver containing two differentially connected thermocouples 4 and 5 located along the axis of the heater 1 at the same distance from it opposite to this,; a pressing mechanism, made of a base with two: lodgments 6 for mounting the device on a fuel element 2 along its axis and an elastic retainer, made in the form of a plate 7, repeating the shape of the base w with lodgments 6, and two 11 and spring springs

performed in the form of a bar 9, fixed with 16, the registration of the temporary clamping of the lodgements 6 at a distance that ensures the axial stability of the device — relative to the fuel rod 2 (for the telnets of the type BI, the distance between the lodgments 6 is equal to the pitch of the dista- On the insulator 10, elastic current leads are fastened with screws 11 (position of heater 1 can be adjusted by rotating elastic current leads 3 around the axis of screws 11 and sampling the gap between the holes and current leads -.0 and screw - mi 1). The insulator 10 fixedly mounted to the strap 9 by means of the angle 12 and has two cradle dl. thermoelements -4 and 5. Slats 9 and 7 have brackets 13 for fixing the jaws of the manipulator 14, and the length of the slats 9 and 7 choose. from the maximum allowable force developed by the manipulator 14 and the stiffness of the springs 8. The device is spun; also by the second thermal receiver 15, fixed on the rear side of the heater I Li (} 5 effectively connected, thermoelements 4 and 5 are connected to the main thermal-MV input of the registration unit 16, the second thermal sensor 15 is connected to the second input of the registration unit 16, nag35

40

45

50

55

signals from a dissipative thermal receiver.

 Previously, on reference samples with gas pressure known in the measured range, similar tests are carried out, the dp value of each sample is determined, the maximum signal during the measurement of the aperture, a calibration curve is plotted as a function of the pressure dependence of the signal , according to which and by the measurement of the signal in question on the studied system, the non-magnitude of the gas pressure inside it is determined.

The efficiency of the proposed device was tested on reference samples made from BN-350 fuel cell shells under the conditions of the BN-350 reactor protection chamber, from the gas pressure range 0-100 atm. The duration of the heating pulse was 1.5. s, the maximum temperature of the shell under the heater, the heater (nichrome foil), oh- BaTHBaroitpifi half of the perimeter of the shell, had a length of 10 mm, the distance from the edge of the heater to the differential, thermal receiver 10 mm, used as thermal receivers

622292

peaTejTb 1 ps, to the t / yri block nagregyu -) -. As a recording recorder block b, for example, a recorder 11-327 is used, for example, as a heating control block 17, to use a heating device with an adhesion heater.

The device works. The next way is Q.

The horn-1O cy of the manipulator 1A is connected to the gas cavity of the fuel element 2, vertically placed in a protective chamber, and secured to the 15 shell with an elastic retainer by releasing the slats 9 and 7 by the manipulator 1A. This heater 11 tightly seizes the shell TVzla

2, thermoelements; 4 and 5 tightly 20 are pressed against it on the PHBIFOM distance from the edges of the heater. The clamping force of thermoelements 4 and 5 and the heater is kept constant from ob-. the sample to the sample and is determined by the stiffness of the springs 8. Then using

heating control unit 17 and narpiever 1 perform pulsed heating of the fuel element shell 2 with simultaneous recording using a block

five

0

five

0

five

signals from a dissipative thermal receiver.

 Previously, on reference samples with gas pressure known in the measuring range, similar tests are carried out, the d.p value of each sample is determined as the maximum signal during the measuring time of the air, a calibration curve is plotted as a function of pressure, According to which and by the measurement of the signal in question on the studied system, the value of the gas pressure inside it is determined.

The efficiency of the proposed device was tested on reference samples made from BN-350 fuel cell shells under the conditions of the BN-350 reactor protection chamber, from the gas pressure range 0-100 atm. The duration of the heating pulse was 1.5. S, the maximum temperature of the shell under the heater, the heater (nichrome foil), oh- BaTHBaroitpifi half of the perimeter of the shell, had a length of 10 mm, the distance from the edge of the heater to the differential, thermal receiver 10 mm, as thermal receivers was used

3

chromel capelip thermocouple, recording time 10 s.

Claims (1)

Invention Formula A device for measuring gas pressure in fuel rotor nuclear supports containing a heater, a thermal receiver, and a mechanism for pressing them to the gas collector of the fuel being investigated, which is because A. Sokolovskiy’s compiler A.T.Ivanova Tehred M.HodaniKorretor s.Cherni Order 3722. Circulation: Subscription , VNIIPI USSR State Committee on Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. ; -; - - - - - - Production and printing company, Uzhgorod, st. Design, h 13fi2229 In order to shorten the measurement time, the heater is made in the form of metal foil with uprules and current leads, the clamping mechanism is made in the form of a base with detachable spring-loaded cradles for installation on the wire, and the heater and the thermogun are fixed on the base along the axis of the cradle, and the base is fixed between the lodgements.