CN108182980A - It is a kind of to sob the air-channel system for inhaling detection device online suitable for fuel can - Google Patents

It is a kind of to sob the air-channel system for inhaling detection device online suitable for fuel can Download PDF

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Publication number
CN108182980A
CN108182980A CN201711203852.0A CN201711203852A CN108182980A CN 108182980 A CN108182980 A CN 108182980A CN 201711203852 A CN201711203852 A CN 201711203852A CN 108182980 A CN108182980 A CN 108182980A
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CN
China
Prior art keywords
road
air
gas
fuel
valve
Prior art date
Application number
CN201711203852.0A
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Chinese (zh)
Inventor
王婷婷
林德雨
张庆威
刘红旗
马刚
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中核控制系统工程有限公司
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Priority to CN201711203852.0A priority Critical patent/CN108182980A/en
Publication of CN108182980A publication Critical patent/CN108182980A/en

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    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21CNUCLEAR REACTORS
    • G21C17/00Monitoring; Testing ; Maintaining
    • G21C17/06Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination

Abstract

The present invention relates to a kind of air-channel systems for sobbing suction detection device online suitable for fuel can, include the sleeve of external fuel manipulator crane device, for measuring the measuring chamber of radgas activity, the switch valve of external compressed air and the gas injection road of each device of connection, pumping road, purification road and flushing road.The present invention can be reduced effectively in radgas133Xe,85Kr radioactive activities reduce the injury to operating personnel and personnel of reloading.Gas path device is simple, can be carried out continuously processing, not influenced by exhaust gas production.Independent flushing road is designed, flushing flow rate is controllable, and flushing gas can purify.Without individually being operated to sleeve upper cover, accidental operation is reduced.

Description

It is a kind of to sob the air-channel system for inhaling detection device online suitable for fuel can

Technical field

The invention belongs to the damage testing fields of pressurized-water reactor nuclear power plant fuel element cladding, and in particular to one kind is suitable for The air-channel system of line fuel element failure detection device.

Background technology

During reactor refuling, in order to differentiate damaged fuel assembly in time and be isolated, pollution reactor core is avoided With coolant circuit, storage pond etc., to determine whether Reactor fuel element cladding is complete.Online suction detecting system of sobbing is in fuel During reactor core taking-up, nuclear power plant's necessary equipment of fast qualitative detection is carried out to fuel assembly by beam, is reloaded every time necessary It uses.

Online sob is inhaled in detecting system, if element has a breakage, gas fission product, predominantly133Xe、85Kr, can be from combustion Charge bar escapes.Compressed air by gas injection road is injected from component bottom in sleeve, if there is failed fuel element involucrum, is split Becoming gas can be carried secretly the cell for flowing upwardly to upper cartridge by compressed air.Small mixture of the interior formation containing fission product.Very Empty generator generates negative pressure, by being evacuated road, mixture is evacuated, radgas is directly arranged after flowing through γ measuring chambers Go out.If γ measuring chambers measure133Xe activity is higher, then it is damaged to illustrate that fuel can exists.

It is both domestic and external at present it is online sob in the gas path device for inhaling detecting system, pumping circuit is by radgas, mainly For133Xe,85Kr is exhausted directly to air through exhaust outlet, unprocessed.Especially have fuel sheath failure when, radioactivity gas In body133Xe,87The activity of Ke is higher, and half-life period is longer, if being drawn into human body, it will cause stronger interior irradiations.In air The fission gas retained can cause radiological hazard to equipment operator and personnel of reloading.

After failed element is detected, background can increase in gas circuit, need to be to gas to ensure the accuracy of next component detection Road is rinsed to reach background level.The backwashing manner that current external product uses for:Exhaust outlet is closed, pumping road air-flow occurs It reverses, compressed air flow to sleeve upper end cell through γ measuring chambers.It needs artificially to open sleeve upper cover at this time, so that gas is discharged. This kind of method gas circuit integrality is destroyed, and during reloading, and easily causes accidental operation.

Invention content

It is an object of the invention to:Fuel element failure is provided and sobs the air-channel system scheme for inhaling detection device online, is solved In existing gas circuit radioactive pollution and rinse the problems such as.

Technical scheme is as follows:It is a kind of to sob the air-channel system for inhaling detection device, packet online suitable for fuel can The sleeve of external fuel manipulator crane device is included, for measuring the measuring chamber of radgas activity, the switch valve of external compressed air And gas injection road, pumping road, purification road and the flushing road of each device of connection;

The gas injection road, for sleeve bottom injecting compressed air, including gas injection stop valve, gas injection regulating valve, noting Pressure gauge and gas flow meter;The one end on gas injection road is connected with sleeve bottom, other end connection air pressure switch valve;

The pumping road, including pumping shut-off valve, extraction control valve, suction pressure meter, extraction flow gauge and vacuum hair Raw device;The vacuum generator has 3 end interfaces, and the safety valve on one end connection purification road, one end is connected by extraction flow gauge and surveyed Room is measured, the other end passes sequentially through suction pressure meter, extraction control valve, pumping shut-off valve and is connected to switch valve, and measuring chamber is connected to Sleeve upper end;

The purification road for purification gas, reduces the radioactive activity of discharge gas, one end connection vacuum generator Further it is detained bed I with safety valve, drier, activated carbon guard bed, activated carbon afterwards, activated carbon is detained bed II, high efficiency particulate air filter It is sequentially connected with detector;

The flushing road, when fuel assembly has breakage, the radioactive activity for being evacuated gas in road increases, to make pumping Gaseous radioactivity activity is restored to background level in road, and pumping road is rinsed;Rinse road one end connection air pressure switch Valve, the other end pass sequentially through the upper end company rinsed after shut-off valve, flushing regulating valve, flushing pressure meter, rinse flow gauge with sleeve It connects.

The sleeve inner is equipped with nuclear fuel assembly;The drier, adsorption capacity of the vapor in activated carbon It is better than inert gas, when airflow humidity is higher, activated carbon can adsorb vapor first, lead to the adsorption capacity to inert gas Decline, therefore increase drier in gas circuit and gas is dried;The drier selects Zeolite dehydration device;The activity Charcoal guard bed avoids having an impact consequent activities charcoal delay bed for absorbing moisture abnormal in air-flow;The activated carbon It is detained bed I and activated carbon is detained bed II using dust active carbon, raw material is the organic material rich in carbon;The high efficiency particulate air filter Using synthetic fibers or glass fibre, particle is efficiently trapped, removes the active carbon particle that may be carried in air-flow;It is described Detector gas discharge before, gaseous radioactivity is measured, when radioactivity be higher than a certain threshold value when provide alarm, with Convenient to operate person is intervened;The detector is scintillator gas room;The detector is mica window GM counting tubes;It is described Safety valve be exhaust protection valve, when exhaust line occur it is abnormal cause airline pressure excessively high when, open safety valve and discharge gas; The measuring chamber is surrounded by vitriol chamber, and gamma detector is contained in inside.

The remarkable result of the present invention is:

1) increase purifying radioactive gas gas circuit.It can effectively reduce in radgas133Xe,85Kr radioactive activities, subtract Few injury to operating personnel and personnel of reloading.Gas path device is simple, can be carried out continuously processing, not by the shadow of exhaust gas production It rings, it is not high to improve investment.

2) the flushing design of such scheme, flushing effect is preferable, and flushing flow rate is controllable, and flushing gas can purify.Fuel water Belong to high-risk operation on pond, such design of rinsing does not have to individually operate sleeve upper cover, reduces accidental operation.

Description of the drawings

Fig. 1 inhales monitoring device air-channel system figure for online sob;

In figure:1. switch valve, 2. measuring chambers, 3. driers, 4. activated carbon guard beds, 5. activated carbons are detained I, 6. activity of bed Charcoal is detained bed II, 7. high efficiency particulate air filters, 8. detectors, 9. shut-off valves, 10. regulating valves, 11. pressure gauges, 12. flowmeters, 13. peaces 14. vacuum generator of full valve, 15. nuclear fuel assemblies, 16. casings.

Specific embodiment

Below in conjunction with the accompanying drawings and specific embodiment sobs suction detection online to a kind of fuel can that is suitable for of the present invention The air-channel system of device is described in further detail.

As shown in Figure 1, a kind of sob the air-channel system for inhaling detection device suitable for fuel can online, including external loading and unloading The sleeve 16 of machine device, for measuring the measuring chamber 2 of radgas activity, the switch valve 1 of external compressed air and connection Gas injection road, pumping road, purification road and the flushing road of each device;

The gas injection road, for 16 bottom injecting compressed air of sleeve, including gas injection stop valve, gas injection regulating valve, Gas injection pressure meter and gas flow meter;The one end on gas injection road is connected with 16 bottom of sleeve, other end connection air pressure switch valve 1;

The pumping road, including pumping shut-off valve, extraction control valve, suction pressure meter, extraction flow gauge and vacuum hair Raw device 14;The vacuum generator 14 has 3 end interfaces, and the safety valve 13 on one end connection purification road, one end passes through extraction flow gauge Measuring chamber 2 is connected, the other end passes sequentially through suction pressure meter, extraction control valve, pumping shut-off valve and is connected to switch valve 1, measures Room 2 is connected to 16 upper end of sleeve;

The purification road for purification gas, reduces the radioactive activity of discharge gas, one end connection vacuum generator Further it is detained bed I 5 with safety valve 13, drier 3, activated carbon guard bed 4, activated carbon after 14, activated carbon is detained bed II 6, high Effect filter 7 and detector 8 are sequentially connected;

The flushing road, when fuel assembly has breakage, the radioactive activity for being evacuated gas in road increases, to make pumping Gaseous radioactivity activity is restored to background level in road, and pumping road is rinsed;Rinse road one end connection air pressure switch Valve 1, the other end pass sequentially through rinse shut-off valve 9, rinse regulating valve 10, flushing pressure meter 11, after rinse flow gauge 12 with sleeve 16 upper end connection.

16 inside of sleeve is equipped with nuclear fuel assembly 15;The drier 3, absorption of the vapor in activated carbon Ability is better than inert gas, and when airflow humidity is higher, activated carbon can adsorb vapor first, lead to the absorption to inert gas Ability declines, therefore increases drier in gas circuit and gas is dried;The drier 3 selects Zeolite dehydration device.

The activated carbon is detained bed I 5 and activated carbon is detained bed II 6 using dust active carbon, and raw material is having rich in carbon Machine material, such as coal, timber, shell;Work is attached to due to the effect of adsorption into active-carbon bed gas macromolecular On property charcoal, it is trapped in active-carbon bed inside;Wherein radionuclide Xe, Kr is preferably adsorbed because molecular weight is larger by activated carbon, The small gas of its molecular weight such as hydrogen, nitrogen etc. are expelled directly out with air-flow;After a period of time, the gas molecule meeting adsorbed It is separated again due to parsing, and as air-flow is pushed ahead, bed absorption is then detained by activated carbon below;By in this way One section of continuous absorption, resolving, activated carbon it is active-carbon bed it is interior be detained a period of time, due to decaying for itself, Its radioactivity has substantially reduced.

Activated carbon is detained bed and the residence time of inert gas can be calculated by the following formula:

T=kd·M/Q

In formula:T- mean residence times, s;

The filling quality of M- activated carbons, g;

Q- gas flows, cm3/s。

The detector 8 measures gaseous radioactivity before gas discharge, when radioactivity is higher than a certain threshold value When provide alarm, so that operator is intervened;The detector 8 is scintillator gas room;The detector 8 is mica Window GM counting tubes;The safety valve 13 is exhaust protection valve, when exception, which occurs, in exhaust line causes airline pressure excessively high, is opened Safety valve discharges gas;The measuring chamber 2 is surrounded by vitriol chamber, and gamma detector is contained in inside.

After having fuel assembly breakage, residual radioactivity substance is had in gas circuit;Before carrying out next group of component and being promoted, Pipeline need to be rinsed, so that gas circuit radioactivity reaches background level.

Pumping road shut-off valve is closed, opens and rinses road shut-off valve.Compressed air is by rinsing road shut-off valve, rinsing road at this time Regulating valve, flushing pressure meter, flushing road flowmeter enter the small interior in sleeve upper end.By small indoor residual gas along pumping road, pass through It crosses measuring chamber, flowmeter, vacuum generator, send to the discharge of purification road.This process reaches to flushing remaining in gas circuit.

Since inert gas chemical property is stablized, it is difficult to be removed it by chemical reaction.It is main in radgas Element133Xe and85The half-life period of Kr is all shorter, and generally by the natural decay of 1 month or so, radioactivity can be reduced to Originally 2% or so, its radioactivity is reduced by natural decay.By the physical absorption performance of activated carbon, in room temperature, normal pressure Lower Adsorption of Radioactive inert gas, after the decay of certain time, then is discharged.

Since activated carbon is based on physical property to the absorption of inert gas, will not fail under normal circumstances.Protect drying The activated carbon of state, which is detained bed, to be used for a long time, it is not necessary to replace.

The radgas extracted out through vacuum generator enters purification road, and gas removes water, into activity through the drying of drier 3 Charcoal guard bed 4 absorbs abnormal moisture, is detained bed I 5 into activated carbon, radgas remains in activated carbon and is detained one in bed I 5 The section time enters activated carbon after activated carbon parsing and is detained bed II 6;Gas is filtered through high efficiency particulate air filter 7, reaches detector 8;Detection Whether device 8 is used for examining hot drain up to standard, if there is exceptional value, provides prompting.

Claims (10)

1. a kind of sob the air-channel system for inhaling detection device suitable for fuel can online, it is characterised in that:Including external loading and unloading The sleeve (16) of machine device, for measuring the measuring chamber of radgas activity (2), the switch valve (1) of external compressed air with And gas injection road, pumping road, purification road and the flushing road of each device of connection;
The gas injection road, for sleeve (16) bottom injecting compressed air, including gas injection stop valve, gas injection regulating valve, noting Pressure gauge and gas flow meter;The one end on gas injection road is connected with sleeve (16) bottom, other end connection air pressure switch valve (1);
The pumping road, including pumping shut-off valve, extraction control valve, suction pressure meter, extraction flow gauge and vacuum generator (14);The vacuum generator (14) has 3 end interfaces, and the safety valve (13) on one end connection purification road, one end passes through extraction flow Meter connection measuring chamber (2), the other end pass sequentially through suction pressure meter, extraction control valve, pumping shut-off valve and are connected to switch valve (1), measuring chamber (2) is connected to sleeve (16) upper end;
The purification road for purification gas, reduces the radioactive activity of discharge gas, one end connection vacuum generator (14) Further it is detained bed I (5) with safety valve (13), drier (3), activated carbon guard bed (4), activated carbon afterwards, activated carbon is detained bed II (6), high efficiency particulate air filter (7) and detector (8) are sequentially connected;
The flushing road, when fuel assembly has breakage, the radioactive activity for being evacuated gas in road increases, to make in pumping road Gaseous radioactivity activity is restored to background level, and pumping road is rinsed;Rinse road one end connection air pressure switch valve (1), the other end, which passes sequentially through, rinses shut-off valve (9), rinses regulating valve (10), flushing pressure meter (11), rinse flow gauge (12) The upper end with sleeve (16) is connect afterwards.
2. a kind of air-channel system for sobbing suction detection device online suitable for fuel can as described in claim 1, feature exist In:Nuclear fuel assembly (15) is housed inside the sleeve (16).
3. a kind of air-channel system for sobbing suction detection device online suitable for fuel can as described in claim 1, feature exist In:The drier (3), adsorption capacity of the vapor in activated carbon is better than inert gas, living when airflow humidity is higher Property charcoal can adsorb vapor first, cause to the decline of the adsorption capacity of inert gas, therefore increase drier in gas circuit to gas It is dried, selects Zeolite dehydration device.
4. a kind of air-channel system for sobbing suction detection device online suitable for fuel can as described in claim 1, feature exist In:The activated carbon guard bed (4) avoids being detained consequent activities charcoal bed generation shadow for absorbing moisture abnormal in air-flow It rings.
5. a kind of air-channel system for sobbing suction detection device online suitable for fuel can as described in claim 1, feature exist In:The activated carbon is detained bed I (5) and activated carbon is detained bed II (6) using dust active carbon, and raw material is rich in the organic of carbon Material.
6. a kind of air-channel system for sobbing suction detection device online suitable for fuel can as described in claim 1, feature exist In:The high efficiency particulate air filter (7) efficiently traps particle, removing can in air-flow using synthetic fibers or glass fibre The active carbon particle that can be carried.
7. a kind of air-channel system for sobbing suction detection device online suitable for fuel can as described in claim 1, feature exist In:The detector (8) measures gaseous radioactivity before gas discharge, when radioactivity is higher than a certain threshold value Alarm is provided, so that operator is intervened.
8. a kind of air-channel system for sobbing suction detection device online suitable for fuel can as described in claim 1, feature exist In:The detector (8) is scintillator gas room or mica window GM counting tubes.
9. a kind of air-channel system for sobbing suction detection device online suitable for fuel can as described in claim 1, feature exist In:The safety valve (13) is exhaust protection valve, when exception, which occurs, in exhaust line causes airline pressure excessively high, opens safety valve Gas is discharged.
10. a kind of air-channel system for sobbing suction detection device online suitable for fuel can as described in claim 1, feature exist In:The measuring chamber (2) is surrounded by vitriol chamber, and gamma detector is contained in inside.
CN201711203852.0A 2017-11-27 2017-11-27 It is a kind of to sob the air-channel system for inhaling detection device online suitable for fuel can CN108182980A (en)

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