CN108766596B - Cooling system for containment built-in spent fuel pool - Google Patents
Cooling system for containment built-in spent fuel pool Download PDFInfo
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- CN108766596B CN108766596B CN201810378932.8A CN201810378932A CN108766596B CN 108766596 B CN108766596 B CN 108766596B CN 201810378932 A CN201810378932 A CN 201810378932A CN 108766596 B CN108766596 B CN 108766596B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/14—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from headers; from joints in ducts
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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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Abstract
The invention belongs to the technical field of nuclear safety control, and relates to a cooling system of a containment built-in spent fuel pool. The spent fuel pool cooling system comprises a spent fuel pool, a refueling water tank, a containment, a connecting pipeline, a first water collector, a second water collector, a first water drainage pipeline, a second water drainage pipeline, a containment cooling system and a pool cooling system, wherein the spent fuel pool and the refueling water tank are arranged in the containment and are connected through the connecting pipeline; a first water collector and a second water collector are arranged on the inner side wall of the containment and are respectively used for providing condensed water in the containment for a spent fuel pool and a refueling water tank below through a first drainage pipeline and a second drainage pipeline; the containment is connected with a containment cooling system, and the spent fuel pool is connected with a pool cooling system. The cooling system for the containment built-in spent fuel pool can collect condensed water in the containment and simultaneously ensure the cooling of the containment built-in spent fuel pool and the reactor core.
Description
Technical Field
The invention belongs to the technical field of nuclear safety control, and relates to a cooling system of a containment built-in spent fuel pool.
Background
In nuclear power plants, spent fuel pools are used to store fresh fuel and spent fuel assemblies discharged from the core to a burn-up depth. Because the spent fuel has radioactivity, the spent fuel pool needs to ensure a shielding water level to realize radioactive containment. Meanwhile, the spent fuel has a certain decay heat, so that the spent fuel pool needs to be cooled, the water level of the spent fuel pool is prevented from being reduced due to evaporation, the spent fuel is exposed, even the spent fuel is melted and damaged, and a large amount of radioactivity is released.
At present, most nuclear power plants, such as the boiling water reactor and the pressurized water reactor of the second generation M310 type nuclear power plant and the third generation ACP nuclear power plant of China, adopt an external spent fuel water pool. The external spent fuel pool can possibly cause serious accidents of the spent fuel pool under the conditions that the external spent fuel pool loses cooling and cannot be supplemented with water; and the built-in spent fuel pool can collect condensed water in the containment vessel and guide the condensed water into the containment vessel as long as the containment vessel is ensured to be cooled under the condition of losing the cooling so as to ensure the water supplement of the spent fuel pool.
Chinese patent application 201310011902.0 discloses an in-containment spent fuel pool that is limited to providing cooling to both the core and the spent fuel pool by an in-containment refueling water tank, which may result in the core and the spent fuel pool losing cooling at the same time.
Disclosure of Invention
The invention aims to provide a containment built-in spent fuel pool cooling system which can collect condensed water in a containment and ensure the cooling of the containment built-in spent fuel pool and a reactor core.
To achieve the object, in a basic embodiment, the invention provides a containment built-in spent fuel pool cooling system, which comprises a spent fuel pool, a refueling water tank, a containment, a connecting pipeline, a first water collector, a second water collector, a first water discharge pipeline, a second water discharge pipeline, a containment cooling system and a pool cooling system,
the spent fuel pool and the refueling water tank are arranged in the containment and are connected through the connecting pipeline, the spent fuel pool is used for storing new fuel and spent fuel with a certain fuel consumption degree, and the refueling water tank is used for supplying water for reactor core water injection or reactor cavity submergence with required water quantity;
the connecting pipeline comprises an overflow pipeline which is connected with the spent fuel pool and the upper part of the refueling water tank; the connecting pipeline also comprises a balance pipeline which is connected with the spent fuel pool and the lower part of the refueling water tank, and a check valve which is arranged on the balance pipeline;
the first water collector and the second water collector are arranged on the inner side wall of the containment and are respectively used for providing condensed water in the containment for the spent fuel pool and the refueling water tank below through the first drainage pipeline and the second drainage pipeline;
the first water collector and the second water collector are independent from each other;
the containment is connected with the containment cooling system, and the spent fuel pool is connected with the pool cooling system.
In a preferred embodiment, the present invention provides an in-containment spent fuel pool cooling system, wherein the spent fuel pool cooling system further comprises a third drain line located in the containment for collecting in-containment condensed water in a region where the first water collector and the second water collector do not collect condensed water, and the third drain line is connected to the refueling water tank.
The containment built-in spent fuel pool cooling system has the advantages that condensed water in the containment can be collected, and meanwhile, the containment built-in spent fuel pool and the reactor core are guaranteed to be cooled.
The containment built-in spent fuel pool cooling system is provided with 2 independent water collectors and 3 drainage pipelines and is used for collecting condensed water in the containment to supplement water for the spent fuel pool and the refueling water tank in the containment under the condition that a reactor or the spent fuel pool has an accident. Under the condition that a general system is intact, the 2 independent water collectors can collect condensed water of the containment vessel, and water quantity allocation between the spent fuel pool and the refueling water tank is realized through an overflow pipeline or a balance pipeline. If first water collector or first water discharge pipeline break down, the dead fuel pond emergence accident leads to the water level to descend simultaneously, and under such condition, the comdenstion water that second water collector and other can not collect the region and collect can get into the dead fuel pond by the refueling water tank through second water discharge pipeline, third water discharge pipeline, balanced pipeline, guarantees that the spent fuel subassembly is in the submerged state, can not cause adverse effect to the reactor. If the second water collector or the second water drainage pipeline breaks down and the reactor breaks down at the same time, in such a case, the condensed water collected by the first water collector and other non-collecting areas can enter the refueling water tank through the first water drainage pipeline, the third water drainage pipeline and the overflow pipeline, so that the cooling is provided for the reactor core, and the adverse effect on the spent fuel assembly is avoided. In summary, the containment built-in spent fuel pool cooling system of the invention can simultaneously ensure the cooling of the containment built-in spent fuel pool and the reactor core, avoid the influence on one of the spent fuel pool or the reactor when the other one is in an accident, and prevent the two from losing the cooling at the same time when the accident happens, thereby causing more serious consequences.
Drawings
Fig. 1 is a block diagram illustrating the components of an exemplary in-containment spent fuel pool cooling system of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
An exemplary composition structure of a containment built-in spent fuel pool cooling system of the present invention is shown in fig. 1, and includes a containment, a spent fuel pool 1, a refueling water tank 2, a first water collector 3, a first drain line 4, a second water collector 5, a second drain line 6, an overflow line 7, a balance line 8, a check valve 9, a non-collecting region 10, a third drain line 11, a pool cooling system 12, and a containment cooling system 13.
The spent fuel pool 1 and the refueling water tank 2 are arranged in the containment, wherein the spent fuel pool 1 is used for storing new fuel and spent fuel with a certain fuel consumption degree, and the refueling water tank 2 is used for providing required water volume for reactor core water injection or reactor cavity submergence. Be provided with first water collector 3 and second water collector 5 on the inside wall of containment, first water collector 3 is used for providing the interior condensate water of containment for spent fuel pool 1 of below through first drain line 4, and second water collector 5 is used for providing the interior condensate water of containment for refueling water tank 2 of below through second drain line 6.
The upper parts of the spent fuel pool 1 and the refueling water tank 2 are connected with an overflow pipeline 7, the lower parts of the spent fuel pool and the refueling water tank are connected with a balance pipeline 8, and a check valve 9 is arranged on the balance pipeline 8. The overflow pipeline 7 can introduce the redundant condensed water in the spent fuel pool 1 into the refueling water tank 2; the balance pipeline 8 can lead the water in the refueling water tank 2 into the spent fuel pool 1 to supplement water when the water amount in the spent fuel pool 1 is insufficient, and the check valve 9 on the balance pipeline can prevent the water in the spent fuel pool 1 from flowing out.
In the containment, a third drain line 11 is arranged in a non-collectable area 10 where the first water collector 3 and the second water collector 5 cannot collect the condensed water, and is connected with the refueling water tank 2, so that the condensed water in the containment which cannot be collected by the first water collector 3 and the second water collector 5 can be guided into the refueling water tank 2 as far as possible.
The spent fuel pool 1 is connected with a pool cooling system 12, and the containment is connected with a containment cooling system 13.
The principle of the exemplary in-containment spent fuel pool cooling system of the present invention described above is as follows.
Under the normal condition of the pool cooling system 12, if an accident occurs to the reactor, the refueling water tank 2 supplies water to the reactor core or the reactor cavity to submerge the required water volume, and a large amount of water which is caused by the accident and is capable of releasing mass energy and is submerged in the reactor core or the reactor cavity due to decay heat after shutdown evaporates into the containment, so that the temperature and the pressure of the containment can be raised, at the moment, steam in the atmosphere of the containment can be condensed by the containment cooling system 13, and condensed water is collected by two water collectors and supplemented into the spent fuel water pool 1 and the refueling water tank 2, and meanwhile, even if the second water collector 5 fails or supplies insufficient condensed water, redundant condensed water entering the spent fuel water pool 1 can still flow into the refueling water tank 2 through the overflow pipeline 7.
Under the condition that the pool cooling system 12 loses the cooling function, the decay heat of the spent fuel can enable the moisture in the spent fuel pool 1 to be continuously evaporated, at the moment, the containment cooling system 13 can enable the water vapor in the atmosphere of the containment to be condensed, the condensed water is collected by the two water collectors and is supplemented into the spent fuel pool 1 and the refueling water tank 2, and meanwhile, even if the first water collector 3 is in failure or the provided condensed water is insufficient, the redundant condensed water entering the refueling water tank 2 can still flow into the spent fuel pool 1 through the balance pipeline 8, and the spent fuel assembly is guaranteed to be in a submerged state.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations. The above-described embodiments are merely illustrative of the present invention, and the present invention may be embodied in other specific forms or other specific forms without departing from the spirit or essential characteristics thereof. The described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention should be indicated by the appended claims, and any changes that are equivalent to the intent and scope of the claims should be construed to be included therein.
Claims (2)
1. The utility model provides a built-in spent fuel pond cooling system of containment which characterized in that: the spent fuel pool cooling system comprises a spent fuel pool, a refueling water tank, a containment, a connecting pipeline, a first water collector, a second water collector, a first water drainage pipeline, a second water drainage pipeline, a containment cooling system and a pool cooling system,
the spent fuel pool and the refueling water tank are arranged in the containment and are connected through the connecting pipeline, the spent fuel pool is used for storing new fuel and spent fuel with a certain fuel consumption degree, and the refueling water tank is used for supplying water for reactor core water injection or reactor cavity submergence with required water quantity;
the connecting pipeline comprises an overflow pipeline which is connected with the spent fuel pool and the upper part of the refueling water tank; the connecting pipeline also comprises a balance pipeline which is connected with the spent fuel pool and the lower part of the refueling water tank, and a check valve which is arranged on the balance pipeline;
the first water collector and the second water collector are arranged on the inner side wall of the containment and are respectively used for providing condensed water in the containment for the spent fuel pool and the refueling water tank below through the first drainage pipeline and the second drainage pipeline;
the first water collector and the second water collector are independent from each other;
the containment is connected with the containment cooling system, and the spent fuel pool is connected with the pool cooling system.
2. The spent fuel pool cooling system according to claim 1, wherein: the spent fuel pool cooling system also comprises a third drainage pipeline which is positioned in the containment and used for collecting the condensed water in the containment in the area where the condensed water cannot be collected by the first water collector and the second water collector, and the third drainage pipeline is connected with the refueling water tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810378932.8A CN108766596B (en) | 2018-04-25 | 2018-04-25 | Cooling system for containment built-in spent fuel pool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810378932.8A CN108766596B (en) | 2018-04-25 | 2018-04-25 | Cooling system for containment built-in spent fuel pool |
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| CN108766596A CN108766596A (en) | 2018-11-06 |
| CN108766596B true CN108766596B (en) | 2021-06-25 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5255296A (en) * | 1992-06-24 | 1993-10-19 | Westinghouse Electric Corp. | Collecting and recirculating condensate in a nuclear reactor containment |
| CN202887745U (en) * | 2012-09-27 | 2013-04-17 | 中国核电工程有限公司 | Active and passive combined safety shell heat extraction device |
| CN103440887A (en) * | 2013-09-10 | 2013-12-11 | 华北电力大学 | Low-temperature negative-pressure heat tube of spent fuel pool |
| CN103928069A (en) * | 2013-01-14 | 2014-07-16 | 上海核工程研究设计院 | Containment built-in spent fuel pool |
| CN104167229A (en) * | 2014-04-24 | 2014-11-26 | 国核华清（北京）核电技术研发中心有限公司 | Passive containment shell condensed water injection system |
| CN104575633A (en) * | 2013-10-12 | 2015-04-29 | 中科华核电技术研究院有限公司 | Passive water replenishment and heat export system for spent fuel pool |
-
2018
- 2018-04-25 CN CN201810378932.8A patent/CN108766596B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5255296A (en) * | 1992-06-24 | 1993-10-19 | Westinghouse Electric Corp. | Collecting and recirculating condensate in a nuclear reactor containment |
| CN202887745U (en) * | 2012-09-27 | 2013-04-17 | 中国核电工程有限公司 | Active and passive combined safety shell heat extraction device |
| CN103928069A (en) * | 2013-01-14 | 2014-07-16 | 上海核工程研究设计院 | Containment built-in spent fuel pool |
| CN103440887A (en) * | 2013-09-10 | 2013-12-11 | 华北电力大学 | Low-temperature negative-pressure heat tube of spent fuel pool |
| CN104575633A (en) * | 2013-10-12 | 2015-04-29 | 中科华核电技术研究院有限公司 | Passive water replenishment and heat export system for spent fuel pool |
| CN104167229A (en) * | 2014-04-24 | 2014-11-26 | 国核华清（北京）核电技术研发中心有限公司 | Passive containment shell condensed water injection system |
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