CN107170497B - A kind of large size pool type natrium cold fast reactor neutron detection method - Google Patents
A kind of large size pool type natrium cold fast reactor neutron detection method Download PDFInfo
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- CN107170497B CN107170497B CN201710323758.2A CN201710323758A CN107170497B CN 107170497 B CN107170497 B CN 107170497B CN 201710323758 A CN201710323758 A CN 201710323758A CN 107170497 B CN107170497 B CN 107170497B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/06—Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination
- G21C17/07—Leak testing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention discloses a kind of large-scale pool type natrium cold fast reactor neutron detection methods, the first neutron detector is set in the neutron detector chamber in heap container side, refueling machine direction, it is arranged in the heap container below this direction refueling machine simultaneously and squeezes sodium chamber, forms neutron extraction channel；Close to neutron extraction channel direction arranged off-centre neutron source；The second neutron detector in refueling machine lateral location setting heap, is used in combination the first neutron detector and the second neutron detector realizes the neutron detection of large-scale pool type natrium cold fast reactor.The present invention realizes the outer neutron monitoring range covering total power range of heap container, and can play the role of overall process monitoring during first fuel loading starts and reloads.
Description
Technical field
The invention belongs to corpuscular radiation fields of measurement, in particular to a kind of large-scale pool type natrium cold fast reactor neutron detection side
Method.
Background technique
Neutron Flux Monitoring System is the essential monitoring system of reactor, is related to reactor start-up, power fortune
Can row, shutdown, test and charging process go on smoothly.According to China's correlation nuclear safety codes and the regulation of professional standard, instead
Stack device is answered to must be provided with neutron fluence rate monitoring device.
The large-scale sodium-cooled fast reactor neutron detection method of Russia uses the inside and outside setting neutron detector of reactor vessel, is
So that container external detector is received more neutron signals and cavity is set in container to increase neutron to container external leakage.
But this method is affected by the size of reactor vessel, for larger sized reactor, is arranged outside heap container
Neutron detector is difficult to receive effective neutron signal.And the neutron detector being arranged outside heap container is to reactor first fuel loading
And the neutron monitoring during cold-refueling is unable to satisfy requirement.
Although China has not yet built up large-scale sodium-cooled fast reactor, outside the heap container of the large-sized pool type natrium cold fast reactor of high power
The problem of neutron detection is urgently to be resolved.
Summary of the invention
(1) goal of the invention
Large-scale pool type natrium cold fast reactor neutron detection ability is measured the present invention overcomes the prior art, and standard, heap container is not achieved
The neutron detector of outer setting is unable to satisfy requirement and big to the neutron monitoring during reactor first fuel loading and cold-refueling
Type pool type sodium-cooled fast reactor core size is larger, even if in heap container be arranged detector can because detector position apart from reactor core compared with
It far is difficult to meet the deficiency of detection requirement, provides a kind of large-scale pool type natrium cold fast reactor neutron detection method.This method solves
The problem of large-scale pool type natrium cold fast reactor neutron detection difficulty realizes the outer neutron monitoring range covering full power amount of heap container
Journey, and overall process monitoring can be played the role of during first fuel loading starts and reloads.
(2) technical solution
In order to solve the problems of prior art, technical solution provided by the invention is as follows:
(1) the first neutron detector is set in the neutron detector chamber in heap container side, refueling machine direction, while
It is arranged in heap container below this direction refueling machine and squeezes sodium chamber, forms neutron extraction channel；
(2) close to neutron extraction channel direction arranged off-centre neutron source；
(3) the second neutron detector in refueling machine lateral location setting heap, is used in combination the first neutron detector and the
Two neutron detectors realize the neutron detection of large-scale pool type natrium cold fast reactor.
Further, in the step (1) to wrapping up moderator around neutron detector cavity room.
Further, the second neutron detector is in refueling machine channel two in the refueling machine side setting heap of the step (3)
Side is respectively set detector and carries out neutron monitoring.
Further, the depleted uranium component of reactor core replaces with stainless steel component on neutron extraction channel direction.
Further, chamber where the first neutron detector and reactor core are arranged in same level by the step (1).
Further, it is wrapped up around step (1) the neutron detector chamber using zircoium hydride.
Further, it is wrapped up around step (1) the neutron detector chamber using graphite.
Further, the second neutron detector is fixed on the fixed protection platform of heap top in the step (2), it will be in second
Plane is set as waiting height in sub- detector probe and reactor core.
Further, moderator is provided with around the neutron source.
Further, (3) second neutron detector of step is only arranged one.
(3) beneficial effect
This method can solve the problems, such as that large-scale pool type natrium cold fast reactor neutron detection is difficult, so that the outer neutron monitoring model of heap container
Covering total power range is enclosed, and overall process monitoring can be played the role of during first fuel loading starts and reloads.Wherein, (1) exists
Detector is set at the reactor pit in heap container side refueling machine direction, while sodium is set in the heap container below this direction refueling machine
Cavity forms neutron extraction channel, and because the heap inner shield in direction thus is weak, neutron is easily leaked out to herein, emptying neutron leakage
Sodium on direction then considerably increases amount of the neutron to heap external leakage；The depleted uranium component of reactor core on neutron extraction channel direction is replaced
Being changed to stainless steel component can make the equivalent heat neutron fluence rate at ex-core detector improve 2-3 times.(2) where neutron detector
Graphite is set around chamber or hydrogenates the moderator of zirconia material, to the Moderation of the fast neutrons for leaking reactor core where detector
Position forms thermal neutron peak, i.e. thermal neutron fluence rate in raising chamber, improves the response of neutron detector；Slowing down is done using graphite
Agent can make thermal neutron fluence rate at detector improve 2 times, do moderator thermal neutron fluence rate using zircoium hydride and improve 4 times；(3) partially
The heart arranges neutron source, so that reactor core neutron is easily leaked out to detector, improves neutron detector detection efficient.
Detailed description of the invention
Fig. 1 squeezes sodium chamber schematic diagram
The outer neutron detector chamber of Fig. 2 heap container and surrounding wrapping layer schematic diagram
Neutron detector schematic diagram is set in Fig. 3 heap container
1. 2. heap top fixed protection platform of reactor core, 3. refueling machine 4. squeezes 5. neutron detector chamber of sodium chamber, 6. moderator
7. 8. neutron source of the second neutron detector
Specific embodiment
Below in conjunction with specification drawings and specific embodiments, the present invention is further elaborated.
First neutron detector is set in the neutron detector chamber 5 in heap container side, 3 direction of refueling machine, while
It is arranged in the heap container of this 3 lower section of direction refueling machine and squeezes sodium chamber 4, forms neutron extraction channel；Arrangement institute as shown in Figure 1, Figure 2
Show；The depleted uranium component of reactor core 1 replaces with stainless steel component on neutron extraction channel direction.Chamber where first neutron detector with
Reactor core 1 is arranged in same level.5 surrounding of neutron detector chamber is wrapped up using zircoium hydride or graphite.In
Sub- extraction channel direction arranged off-centre neutron source 8, as shown in Figure 3；Zircoium hydride or graphite moderator are provided with around neutron source 8.
The second neutron detector 7 is separately positioned on refueling machine channel two sides in heap, is fixed on heap top fixed protection platform 2, in second
The sub- probe of detector 7 is set as waiting height with plane in reactor core 1.Second neutron detector 7 settable one may also set up two.
The first neutron detector is used in combination and the second neutron detector 7 realizes the neutron detection of large-scale pool type natrium cold fast reactor.This implementation
Neutron detector in example can work under high temperature environment.
Carry out large-scale sodium-cooled fast reactor neutron detection through the invention the result shows that: detector cavity cell structure is optimized,
So that reactor core fast neutron is formed thermal neutron peak at detector, and improves detector efficiency.In addition moderator ratio is done not using graphite
Thermal neutron fluence rate at detector can be made to improve 2 times using moderator, do moderator effect ratio using zircoium hydride and done using graphite
Moderator effect improves 2 times.The depleted uranium component of reactor core on neutron extraction channel direction, which is replaced with stainless steel component, can make out-pile
Equivalent heat neutron fluence rate at detector improves 2-3 times.
Claims (10)
1. a kind of large size pool type natrium cold fast reactor neutron detection method, which is characterized in that
(1) the first neutron detector is set in the neutron detector chamber (5) in heap container side, refueling machine (3) direction, together
When heap container below this direction refueling machine (3) in be arranged and squeeze sodium chamber (4), form neutron extraction channel；
(2) close to neutron extraction channel direction arranged off-centre neutron source (6)；
(3) the second neutron detector (7) in refueling machine lateral location setting heap, is used in combination the first neutron detector and the
Two neutron detectors realize the neutron detection of large-scale pool type natrium cold fast reactor.
2. a kind of large-scale pool type natrium cold fast reactor neutron detection method according to claim 1, which is characterized in that the step
(1) to wrapping up moderator around neutron detector cavity room in.
3. a kind of large-scale pool type natrium cold fast reactor neutron detection method according to claim 1, which is characterized in that the step
Suddenly the second neutron detector (7) is to be respectively set second in refueling machine (3) channel two sides in (three) refueling machine (3) side setting heap
Neutron detector (7) carries out neutron monitoring.
4. a kind of large-scale pool type natrium cold fast reactor neutron detection method according to claim 1, which is characterized in that the neutron
The depleted uranium component of reactor core (1) replaces with stainless steel component on extraction channel direction.
5. a kind of large-scale pool type natrium cold fast reactor neutron detection method according to claim 1, which is characterized in that the step
(1) chamber where the first neutron detector and reactor core (1) are arranged in same level.
6. a kind of large-scale pool type natrium cold fast reactor neutron detection method according to claim 2, which is characterized in that the step
(1) it is wrapped up around neutron detector chamber (5) using zircoium hydride.
7. a kind of large-scale pool type natrium cold fast reactor neutron detection method according to claim 2, which is characterized in that the step
(1) it is wrapped up around neutron detector chamber (5) using graphite.
8. a kind of large-scale pool type natrium cold fast reactor neutron detection method according to claim 1, which is characterized in that the step
(3) the second neutron detector is fixed on heap top fixed protection platform (2) in, by the second neutron detector (7) probe and heap
Plane is set as equal height in core (1).
9. a kind of large-scale pool type natrium cold fast reactor neutron detection method according to claim 1, which is characterized in that the neutron
Moderator is provided with around source (6).
10. a kind of large-scale pool type natrium cold fast reactor neutron detection method according to claim 1, which is characterized in that the step
Suddenly (three) second neutron detectors are only arranged one.
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| CN107170497B true CN107170497B (en) | 2019-03-12 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0540191A (en) * | 1991-08-08 | 1993-02-19 | Toshiba Corp | Neutron detector |
| JP2006162488A (en) * | 2004-12-09 | 2006-06-22 | Toshiba Corp | Neutron detector movement support device during fuel loading, and support method |
| CN102810338A (en) * | 2012-08-17 | 2012-12-05 | 中国原子能科学研究院 | Sodium-void reactivity measurement method for sodium-cooled fast reactor and sodium-void experimental assembly |
| US8384004B1 (en) * | 2004-10-22 | 2013-02-26 | Lawrence Livermore National Security | Real-time multi-mode neutron multiplicity counter |
| CN103314309A (en) * | 2010-10-14 | 2013-09-18 | 阿利发Np有限公司 | Self-calibrating, highly accurate, long-lived, dual rhodium vanadium emitter nuclear in-core detector |
| JP5957174B2 (en) * | 2010-12-14 | 2016-07-27 | 株式会社東芝 | Radiation measurement equipment for spent fuel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3845685B2 (en) * | 2001-07-10 | 2006-11-15 | 独立行政法人 日本原子力研究開発機構 | Nondestructive measuring device for the amount of fissile material in radioactive waste solids |
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2017
- 2017-05-10 CN CN201710323758.2A patent/CN107170497B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0540191A (en) * | 1991-08-08 | 1993-02-19 | Toshiba Corp | Neutron detector |
| US8384004B1 (en) * | 2004-10-22 | 2013-02-26 | Lawrence Livermore National Security | Real-time multi-mode neutron multiplicity counter |
| JP2006162488A (en) * | 2004-12-09 | 2006-06-22 | Toshiba Corp | Neutron detector movement support device during fuel loading, and support method |
| CN103314309A (en) * | 2010-10-14 | 2013-09-18 | 阿利发Np有限公司 | Self-calibrating, highly accurate, long-lived, dual rhodium vanadium emitter nuclear in-core detector |
| JP5957174B2 (en) * | 2010-12-14 | 2016-07-27 | 株式会社東芝 | Radiation measurement equipment for spent fuel |
| CN102810338A (en) * | 2012-08-17 | 2012-12-05 | 中国原子能科学研究院 | Sodium-void reactivity measurement method for sodium-cooled fast reactor and sodium-void experimental assembly |
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