CN201556427U - Nuclear power station safety shell pit and filter screen thereof - Google Patents
Nuclear power station safety shell pit and filter screen thereof Download PDFInfo
- Publication number
- CN201556427U CN201556427U CN2009202604956U CN200920260495U CN201556427U CN 201556427 U CN201556427 U CN 201556427U CN 2009202604956 U CN2009202604956 U CN 2009202604956U CN 200920260495 U CN200920260495 U CN 200920260495U CN 201556427 U CN201556427 U CN 201556427U
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- filter screen
- melt pit
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- nuclear power
- secondary filter
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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
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Abstract
The utility model relates to a nuclear power station safety shell pit and a filter screen thereof. The nuclear power station safety shell pit comprises a pit main body, wherein a ring-shaped corridor is formed on the edge of the pit main body, a row of flow collection passages is arranged in the ring-shaped corridor, a pit filter screen component is arranged on the flow collection passages, a secondary filter screen component is arranged between the pit filter screen component and the flow collection passages, the pit filter screen component comprises at least one pit filter screen module, the second filter screen component comprises at least one secondary filter screen module, the second filter screen module is arranged between one pit filter screen module and the flow collection passage and is concretely arranged on the bottom of the second filter screen module or on the flow collection passages. Two rows of flow collection passages are combined into one row to lower the pressure drop of the filter screen, simultaneously, the second filter screen component is additionally arranged between the pit filter screen component and the flow collection passages, the safety of the filter screen is improved, the steam corrosion risk of a downstream pump is alleviated, thereby effectively guaranteeing that suction pressing heads of a safety injection and a safety spraying pumps in the recycling phase, and ensuring the realization of safety injection and safety spraying functions.
Description
Technical field
The utility model relates to melt pit, more particularly, relates to a kind of nuclear power plant containment shell melt pit and filter screen thereof.
Background technology
Nuclear power plant containment shell melt pit filter screen blockage problem has obtained the common concern of international nuclear power industry, many countries issue security regulations or instruction in recent years one after another, require the containment sump filter screen of continuing to use early stage design concept is carried out the failure risk evaluation or implement improving.Broad research and a lot of run case of international nuclear power industry prove: in the early stage design of nuclear power station the stopping state of the melt pit filter screen under the emergency conditions such as LOCA is underestimated, had great nuclear safety risk.U.S. NRC (meeting of nuclear pipe) has carried out a series of researchs with other nuclear power industry at melt pit filter screen blockage problem, and it is bigger to the contribution of nuclear power station reactor core damage frequency that the result shows that the melt pit filter screen stops up.
China nuclear safety regulatory authority also pays much attention to melt pit filter screen blockage problem, and external correlative study situation has been carried out nearly 10 years Technical Follow-Up.Abroad under the background that research conclusion is more and more brighter and clearer, China nuclear safety regulatory authority already and will continue to promote domestic nuclear power owner unit and actively consider melt pit filter screen blockage problem, the melt pit filter screen is stopped up risk carry out qualitative and quantitative evaluation, and under the situation of technology necessity, implement hardware modifications or transformation.
As the improved guiding aspiration of domestic application containment sump filter screen power station, mountain range Australia second phase nuclear power station is being implemented the containment sump filter screen and is being improved, and containment sump strainer filtering area has been increased more than 10 times.Yet, feed back according to the experience that mountain range Australia implements in the containment sump filter screen development second phase, the design proposal of containment sump filter screen still needs further to optimize, so that alleviate the fragment load of melt pit filter screen, reduce the pressure drop of melt pit filter screen, improve melt pit filter screen design capacity.
The melt pit filter screen arranges that along containment sump ring corridor footprint area is bigger.Existing product is each less filter screen module, is embedded on the collection flow channels, and the filter screen module has the effect of interception impurity, and water enters collection flow channels by the filter screen module, and collection flow channels is collected water together and taken for the intake of pump.
Have 4 pumps---two safe injection pumps and two containment spray pumps in melt pit water intaking, this is the needs that guarantee power plant safety, inject or safety shower for safety, respectively there is a pump all can realize functional requirement, be provided with that two pumps, two safety inject, the safety shower series have then increased redundance, satisfy single failure criteria, thereby improved the security in power station.For cooperating two series of safe injection, safety shower, the collection flow channels of melt pit filter screen also is set to two row usually, be respectively the water supplying pump of two series, though security has guaranteed like this, but experience from the mountain range Australia second phase, under fragment fully loaded situation, the pressure loss allowance of melt pit filter screen is very little, and downstream pump has certain cavitation risk.
For existing nuclear power station, safety is injected, the position of safety shower pump has been difficult to adjust, for the filter screen design that two row collection flow channels are set, certainly will cause two row collection flow channels overlapping to some extent in the middle part, inject to satisfy safety, the needs that the two pumps of safety shower is fetched water from two row collection flow channels respectively, and two row filter screens are set on collection flow channels accordingly, the shortcoming of this scheme is, report to the leadship after accomplishing a task in the middle of the two row filter screens and improved the pressure drop of filter screen integral body, make under fragment fully loaded situation, the pressure loss allowance of melt pit filter screen is very little, downstream pump has certain cavitation risk, arrange the filter screen collection flow channels if not reporting to the leadship after accomplishing a task, then need adjust on the filter screen Pump Suction Nozzle and arrange to adjust to have big difficulty to the pipeline of pump, the mechanics workload is also very big, and can increase the pressure loss on the pipeline equally, and reducing the net positive suction head of pump, it is relatively poor that this adjusts feasibility.
The utility model content
The technical problems to be solved in the utility model is, at the melt pit filter screen of prior art under fragment fully loaded situation, the pressure loss allowance of melt pit filter screen is very little, and downstream pump has certain defectives such as cavitation risk, and a kind of nuclear power plant containment shell melt pit and filter screen thereof are provided.
The technical scheme that its technical matters that solves the utility model adopts is: construct a kind of nuclear power plant containment shell melt pit, comprise the melt pit main body, form annular gallery at the edge of described melt pit main body, in described annular gallery, be provided with a row collection flow channels, described collection flow channels is provided with the melt pit net-filter assembly, is provided with the secondary filter assembly between described melt pit net-filter assembly and collection flow channels; Described melt pit net-filter assembly comprises at least one melt pit filter screen module, described secondary filter assembly comprises at least one secondary filter module, a secondary filter module is arranged between a melt pit filter screen module and the collection flow channels, in a preferred embodiment, secondary filter module can be arranged on the bottom of a melt pit filter screen module or be arranged on the collection flow channels.
In nuclear power plant containment shell melt pit described in the utility model, described melt pit filter screen module is an annulus tube filter screen module, is being provided with the filtration through hole on anchor ring, following anchor ring, medial surface and the lateral surface on the described annulus tube filter screen module; Described secondary filter assembly is a surface plate structure, is provided with the circular secondary filter module that the following anchor ring of at least one and described annulus tube filter screen module is complementary thereon, and described circular secondary filter module is provided with the filtration through hole.
In nuclear power plant containment shell melt pit described in the utility model, described melt pit net-filter assembly comprises a plurality of annulus tube filter screen modules, and the secondary filter assembly of surface plate structure is provided with a plurality of circular secondary filter modules.
In nuclear power plant containment shell melt pit described in the utility model, described melt pit filter screen module comprises at least two sieve plate that are provided with at interval, be provided with the filtration through hole on the every sieve plate, described secondary filter module is the surface plate structure, is provided with the filtration through hole thereon.
According to another aspect of the present utility model, a kind of nuclear power plant containment shell melt pit filter screen is provided, it is arranged on the collection flow channels of nuclear power plant containment shell melt pit, it is characterized in that, comprises the melt pit net-filter assembly and is arranged on secondary filter assembly between described melt pit net-filter assembly and the collection flow channels; Described melt pit net-filter assembly comprises at least one melt pit filter screen module, and described secondary filter assembly comprises at least one secondary filter module, and a secondary filter module is arranged between a melt pit filter screen module and the collection flow channels.
In nuclear power plant containment shell melt pit filter screen described in the utility model, described melt pit filter screen module is an annulus tube filter screen module, is being provided with the filtration through hole on anchor ring, following anchor ring, medial surface and the lateral surface on the described annulus tube filter screen module; Described secondary filter assembly is a surface plate structure, is provided with the circular secondary filter module that the following anchor ring of at least one and described annulus tube filter screen module is complementary thereon, and described circular secondary filter module is provided with the filtration through hole.
In nuclear power plant containment shell melt pit filter screen described in the utility model, described melt pit net-filter assembly comprises a plurality of annulus tube filter screen modules, and the secondary filter assembly of surface plate structure is provided with a plurality of circular secondary filter modules.
In nuclear power plant containment shell melt pit filter screen described in the utility model, described melt pit filter screen module comprises at least two sieve plate that are provided with at interval, be provided with the filtration through hole on the every sieve plate, described secondary filter assembly is the surface plate structure, is provided with the filtration through hole thereon.
In nuclear power plant containment shell melt pit filter screen described in the utility model, described melt pit net-filter assembly comprises a plurality of annulus tube filter screen modules, and the secondary filter assembly of surface plate structure is provided with a plurality of circular secondary filter modules.
Implement containment sump device of the present utility model, has following beneficial effect: two row collection flow channels are merged into row, to reduce the filter screen pressure drop, between melt pit net-filter assembly and collection flow channels, increase simultaneously and be provided with the secondary filter assembly, improved the security of filter screen, alleviate the cavitation risk of downstream pump, thereby guarantee that effectively recycle stage safety is injected, the intake head of safety shower pump, guarantee the realization of safe injection, safety shower function.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of the utility model nuclear power plant containment shell melt pit one embodiment;
Fig. 2 is the structural representation of the nuclear power plant containment shell melt pit filter screen shown in Fig. 1;
Fig. 3 is the structural representation of another embodiment of the utility model nuclear power plant containment shell melt pit filter screen.
Embodiment
The utility model is to design at nuclear power plant containment shell melt pit and filter screen thereof, nuclear power plant containment shell melt pit filter screen has been born important security function, its performance has directly determined the water intaking reliability in emergence core stacking cool system (ECCS) " recycle " stage, and influences the long-term safety of nuclear power station.The technical program reduces the melt pit filter screen effectively and stops up risk, improves npp safety.
As shown in Figure 1, in nuclear power plant containment shell melt pit of the present utility model, it comprises melt pit main body 1, in this embodiment, the profile of melt pit main body 1 is circular, form annular gallery 11 at the edge of melt pit main body 1, this annular gallery 11 has inner webs and outer webs, shown in Fig. 2 and 3, form collection flow channels 5 in this annular gallery 11, the inner webs of annular gallery 11 is provided with cavity and door, and nuclear power plant containment shell melt pit filter screen 111 is set on collection flow channels 5, this nuclear power plant containment shell melt pit filter screen 111 is along containment sump ring corridor 11, occupy one section, it is embedded on the collection flow channels 5, carries out the impurity interception, water enters collection flow channels 5 by filter screen, and collection flow channels 5 is collected water together and taken for the intake of pump.Fragment flow to melt pit with fluid downwards along the space in the floor in the containment, finally collects in the melt pit annular gallery 11, and the intake of pump and nuclear power plant containment shell melt pit filter screen 111 all are arranged among the annular gallery 11.Flow to the current of melt pit downwards along each space in the floor, in melt pit main body 1, form 9 traffic sources 14, each traffic sources 14 all has the water of certain flow to flow out, behind the melt pit annular of the flowing through gallery 11, through nuclear power plant containment shell melt pit filter screen 111 and collection flow channels, flow out from four outlets that are positioned at the melt pit bottom.
Innovative point of the present utility model is, existing two row collection flow channels are combined into a row collection flow channels, and it needs the lap merging of existing two row collection flow channels is got final product the invariant position of pump intake.For this reason, and nuclear power plant containment shell melt pit filter screen 111 is designed to be made up of two parts, and it comprises the melt pit net-filter assembly and is arranged on the secondary filter assembly of melt pit net-filter assembly bottom.Simultaneously, the melt pit net-filter assembly comprises at least one melt pit filter screen module 6, the secondary filter assembly comprises at least one secondary filter module, promptly to increasing secondary filter between each melt pit filter screen module 6 and the collection flow channels 5, after certain melt pit filter screen module 6 is destroyed, secondary filter can guarantee that fragment can not enter collection flow channels 5 from cut, thereby guarantees the validity of whole filtering net structure.
Among the embodiment as shown in Figure 2, melt pit filter screen module 6 is an annulus tube filter screen module, is provided with on anchor ring, following anchor ring, medial surface and lateral surface on this annulus tube filter screen module 6 and filters through hole 61; And secondary filter assembly 7 is a surface plate structure, is provided with the circular secondary filter module (not shown) that the following anchor ring of at least one and annulus tube filter screen module 6 is complementary thereon, and circular secondary filter module is provided with the filtration through hole.When specific design, this melt pit net-filter assembly comprises a plurality of annulus tube filter screen modules 6, and the secondary filter assembly 7 of surface plate structure is provided with a plurality of circular secondary filter modules.Secondary filter assembly 7 is arranged on the junction of melt pit net-filter assembly and collection flow channels, such as, can be directly arranged in the vacancy of collection flow channels, the leakproofness of looking mounting means can be set to annular or circle; Also can be arranged on the end of melt pit net-filter assembly, be set to annular.The filtration hole size of secondary filter assembly 7 and material can be consistent with the melt pit net-filter assembly.Because the melt pit net-filter assembly was relation in parallel before importing collection flow channels, the increase of secondary filter assembly 7 increases minimum (generally on the secondary filter assembly 7 fragment of deposition can seldom) for the pressure loss of filter screen integral body, and secondary filter assembly 7 is with respect to the melt pit net-filter assembly, its area is also very little, thereby the cost that increases is limited.Therefore, this scheme can be with less economic cost, effectively improve the security and the crushing design capacity of nuclear power plant containment shell melt pit filter screen, thereby guarantee that effectively recycle stage safety is injected, the intake head of safety shower pump, guarantee the realization of safe injection, safety shower function.
Among another embodiment as shown in Figure 3, melt pit filter screen module 6 comprises at least two sieve plate that are provided with at interval, is provided with on the every sieve plate and filters through hole 61, and secondary filter assembly 7 also is the surface plate structure, is provided with thereon and filters through hole 71.In the embodiment shown in fig. 3, melt pit filter screen module 6 is provided with at interval by three sieve plate and forms, yet as the case may be, but the quantity of the sieve plate that is provided with at interval in each melt pit filter screen module 6 of flexible design.
In the technical solution of the utility model, two row filter screens are merged into row, thereby effectively reduce the filter screen pressure drop, alleviate the cavitation risk of downstream pump.The melt pit filter screen is non-active equipment, and the probability that itself breaks down is extremely low, in the rules non-active equipment is not done yet the rigid requirement of single failure criteria.
As shown in Figure 1, when specific design, according to containment sump design feature and flow field distribution features, some middle catching sheets 112 are set, at the bottom of making the part fragment before arriving melt pit filter screen 111, be deposited to the pond, thereby effectively reduce by 112 loads of melt pit filter screen, improve melt pit filter screen design capacity.Transfer to the process of melt pit filter screen 112 with fluid by analytical fragments, catching sheet 112 in the middle of increasing in place, and calculate the fluid flow fields distribution situation in reactor building-3.5m absolute altitude containment sump under the recycle operating mode, calculate deposition and the transmission situation of insulation fragment in melt pit according to Flow Field Distribution.In conjunction with result of calculation, the middle interception measure of insulation fragment is set.Therefore, at first, the catching sheet 112 that this is used to tackle fragment is set at the two ends of melt pit filter screen 111, then, the place, cavity on the sidewall of annular gallery 11 or the position of door place and corresponding melt pit filter screen 111 are provided with this catching sheet 112.In force, catching sheet can be designed as rectangular configuration, and this catching sheet is provided with the filtration aperture.
In the flow process, turbulent flow concentrates the place that middle catching sheet 112 is set on runner, the height of catching sheet 112 is about 0.7～0.9m, and the lowest water level in the melt pit is about 1～1.2m under the recycle operating mode, set up catching sheet 112 and can not hinder fluid collection in melt pit ring corridor, but can effectively reduce the flow turbulence degree, fragment is gathered before catching sheet, reduce the number of tiles that flow to filter screen as far as possible, prevent that filter screen from stopping up.Catching sheet fragment interception result as shown in Figure 2.In one embodiment, when the lowest water level in the melt pit was 1.1m, the height of catching sheet 112 is can be 0.8m.
The utility model describes by several specific embodiments, it will be appreciated by those skilled in the art that, under the situation that does not break away from the utility model scope, can also carry out various conversion and be equal to alternative the utility model.In addition, at particular condition or concrete condition, can make various modifications to the utility model, and not break away from scope of the present utility model.Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole embodiments that fall in the utility model claim scope.
Claims (9)
1. nuclear power plant containment shell melt pit, comprise the melt pit main body, form annular gallery at the edge of described melt pit main body, it is characterized in that, in described annular gallery, be provided with a row collection flow channels, described collection flow channels is provided with the melt pit net-filter assembly, is provided with the secondary filter assembly between described melt pit net-filter assembly and collection flow channels; Described melt pit net-filter assembly comprises at least one melt pit filter screen module, and described secondary filter assembly comprises at least one secondary filter module, and a secondary filter module is arranged between a melt pit filter screen module and the collection flow channels.
2. nuclear power plant containment shell melt pit according to claim 1 is characterized in that, described melt pit filter screen module is an annulus tube filter screen module, is being provided with the filtration through hole on anchor ring, following anchor ring, medial surface and the lateral surface on the described annulus tube filter screen module; Described secondary filter assembly is a surface plate structure, is provided with the circular secondary filter module that the following anchor ring of at least one and described annulus tube filter screen module is complementary thereon, and described circular secondary filter module is provided with the filtration through hole.
3. nuclear power plant containment shell melt pit according to claim 2 is characterized in that, described melt pit net-filter assembly comprises a plurality of annulus tube filter screen modules, and the secondary filter assembly of surface plate structure is provided with a plurality of circular secondary filter modules.
4. nuclear power plant containment shell melt pit according to claim 1, it is characterized in that described melt pit filter screen module comprises at least two sieve plate that are provided with at interval, is provided with the filtration through hole on the every sieve plate, described secondary filter assembly is the surface plate structure, is provided with the filtration through hole thereon.
5. nuclear power plant containment shell melt pit filter screen, it is arranged on the collection flow channels of nuclear power plant containment shell melt pit, it is characterized in that, comprises the melt pit net-filter assembly and is arranged on secondary filter assembly between described melt pit net-filter assembly and the collection flow channels; Described melt pit net-filter assembly comprises at least one melt pit filter screen module, and described secondary filter assembly comprises at least one secondary filter module, and a secondary filter module is arranged between a melt pit filter screen module and the collection flow channels.
6. nuclear power plant containment shell melt pit filter screen according to claim 5, it is characterized in that, described melt pit filter screen module is an annulus tube filter screen module, is being provided with the filtration through hole on anchor ring, following anchor ring, medial surface and the lateral surface on the described annulus tube filter screen module; Described secondary filter assembly is a surface plate structure, is provided with the circular secondary filter module that the following anchor ring of at least one and described annulus tube filter screen module is complementary thereon, and described circular secondary filter module is provided with the filtration through hole.
7. nuclear power plant containment shell melt pit filter screen according to claim 6 is characterized in that, described melt pit net-filter assembly comprises a plurality of annulus tube filter screen modules, and the secondary filter assembly of surface plate structure is provided with a plurality of circular secondary filter modules.
8. nuclear power plant containment shell melt pit filter screen according to claim 5 is characterized in that, described melt pit net-filter assembly comprises a plurality of annulus tube filter screen modules, and the secondary filter assembly of surface plate structure is provided with a plurality of circular secondary filter modules.
9. nuclear power plant containment shell melt pit filter screen according to claim 5, it is characterized in that described melt pit filter screen module comprises at least two sieve plate that are provided with at interval, is provided with the filtration through hole on the every sieve plate, described secondary filter assembly is the surface plate structure, is provided with the filtration through hole thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202604956U CN201556427U (en) | 2009-11-23 | 2009-11-23 | Nuclear power station safety shell pit and filter screen thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202604956U CN201556427U (en) | 2009-11-23 | 2009-11-23 | Nuclear power station safety shell pit and filter screen thereof |
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| Publication Number | Publication Date |
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| CN201556427U true CN201556427U (en) | 2010-08-18 |
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| CN2009202604956U Expired - Lifetime CN201556427U (en) | 2009-11-23 | 2009-11-23 | Nuclear power station safety shell pit and filter screen thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103028285A (en) * | 2012-12-17 | 2013-04-10 | 中国核电工程有限公司 | Filter system for built-in containment refueling water storage tank |
| CN103047129A (en) * | 2012-12-17 | 2013-04-17 | 中国核电工程有限公司 | Filter at safety system pump suction inlet inside replacement material water tank inside nuclear power plant |
| CN103489491A (en) * | 2012-06-12 | 2014-01-01 | 中科华核电技术研究院有限公司 | Device for changing ground pit fragment transmission |
| WO2014094567A1 (en) * | 2012-12-17 | 2014-06-26 | 中国核电工程有限公司 | In-containment refueling water storage tank filter system |
| CN107340218A (en) * | 2017-06-05 | 2017-11-10 | 中广核研究院有限公司 | The pilot system of downstream effect in a kind of research CPR1000 melt pit filter screen heaps |
| CN107464594A (en) * | 2016-06-03 | 2017-12-12 | 中广核研究院有限公司 | Containment recycles blocking apparatus |
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2009
- 2009-11-23 CN CN2009202604956U patent/CN201556427U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103489491A (en) * | 2012-06-12 | 2014-01-01 | 中科华核电技术研究院有限公司 | Device for changing ground pit fragment transmission |
| CN103028285A (en) * | 2012-12-17 | 2013-04-10 | 中国核电工程有限公司 | Filter system for built-in containment refueling water storage tank |
| CN103047129A (en) * | 2012-12-17 | 2013-04-17 | 中国核电工程有限公司 | Filter at safety system pump suction inlet inside replacement material water tank inside nuclear power plant |
| WO2014094567A1 (en) * | 2012-12-17 | 2014-06-26 | 中国核电工程有限公司 | In-containment refueling water storage tank filter system |
| CN103028285B (en) * | 2012-12-17 | 2015-04-22 | 中国核电工程有限公司 | Filter system for built-in containment refueling water storage tank |
| GB2522822A (en) * | 2012-12-17 | 2015-08-05 | China Nuclear Power Eng Co Ltd | In-containment refueling water storage tank filter system |
| GB2522822B (en) * | 2012-12-17 | 2020-09-02 | China Nuclear Power Eng Co Ltd | In-containment refueling water storage tank filter system |
| CN107464594A (en) * | 2016-06-03 | 2017-12-12 | 中广核研究院有限公司 | Containment recycles blocking apparatus |
| CN107464594B (en) * | 2016-06-03 | 2019-08-13 | 中广核研究院有限公司 | Containment recycles blocking apparatus |
| CN107340218A (en) * | 2017-06-05 | 2017-11-10 | 中广核研究院有限公司 | The pilot system of downstream effect in a kind of research CPR1000 melt pit filter screen heaps |
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Granted publication date: 20100818 |