Low head loss modular suction strainer with contoured surfaces
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G21C-009/00
G21C-019/30
B01D-029/07
B01D-039/08
B01D-039/12
출원번호
UP-0596097
(2005-05-03)
등록번호
US-7848475
(2011-01-31)
국제출원번호
PCT/US2005/015178
(2005-05-03)
§371/§102 date
20071227
(20071227)
국제공개번호
WO05/113108
(2005-12-01)
발명자
/ 주소
Kaufman, Andrew E.
Bilanin, Alan J.
출원인 / 주소
Continuum Dynamics, Inc.
대리인 / 주소
Quinlan, P.C., David M.
인용정보
피인용 횟수 :
6인용 특허 :
12
초록▼
A strainer for an emergency core cooling system (ECCS) in a nuclear power plant comprises a perforated strainer element that is immersed in a reservoir of cooling water, which is drawn through the strainer element into the emergency core cooling system. The side of the strainer element in contact wi
A strainer for an emergency core cooling system (ECCS) in a nuclear power plant comprises a perforated strainer element that is immersed in a reservoir of cooling water, which is drawn through the strainer element into the emergency core cooling system. The side of the strainer element in contact with the cooling water has a contoured configuration for disrupting the formation of a flat bed of fibrous material that can trap small particulate material intended to pass through the strainer element. Incorporating this strainer element into an ECCS strainer enables the strainer to be made more compact, because the debris bed need not be spread over an unduly large area to prevent excessive head loss from the debris load in the event of a reactor loss of coolant accident. The strainer also incorporates a modular construction that uses individual strainer disc modules. Each disc module includes a perforated first disc part having a central opening and a perforated second disc part also having a central opening. The first and second disc parts fit together to form an interior space with facing perforated major surfaces and an axial opening, and connecting tubes between the discs place the axial openings in fluid communication. The entire assembly is secured together by tie rods that hold the discs together with the connecting tubes compressed between them.
대표청구항▼
What is claimed is: 1. A nuclear power plant emergency core cooling system that circulates cooling water during a power plant loss of cooling accident, said cooling system having therein a strainer comprising: a strainer element for immersion in the cooling water during the loss of cooling accident
What is claimed is: 1. A nuclear power plant emergency core cooling system that circulates cooling water during a power plant loss of cooling accident, said cooling system having therein a strainer comprising: a strainer element for immersion in the cooling water during the loss of cooling accident, said strainer element including at least two strainer members, each said strainer member having a continuous major surface with a plurality of perforations therethrough distributed on at least a portion of said major surface for straining fibrous debris from cooling water passing through said perforations during the loss of cooling accident, wherein said strainer members are disposed with said major surfaces in spaced apart relation to form a hollow interior space with external sides of said major surfaces facing the cooling water during the loss of cooling accident; and a suction opening operatively connected between an emergency core cooling system pump and said interior space for drawing the cooling water into said interior space from said external sides through said perforations, wherein said external sides of said strainer member major surfaces have contouring members on at least said perforated portions of said major surfaces, and said contouring members contact fibrous debris in said cooling water during the loss of cooling accident to disrupt the formation on said perforations of a flat bed of fibrous debris that can trap particulate material small enough to pass through said perforations. 2. A nuclear power plant emergency core cooling system as in claim 1, wherein said contouring members comprise wire mesh cloth covering at least said perforated portions of said external sides of said major surfaces. 3. A nuclear power plant emergency core cooling system, as in claim 1, wherein said contouring members comprise a plurality of protrusions extending from at least said perforated portions of said external sides of said major surfaces. 4. A nuclear power plant emergency core cooling system as in claim 3, wherein said protrusions are substantially uniform and are raised above said external sides of said major surfaces in a regular repeating pattern. 5. A nuclear power plant emergency core cooling system as in claim 4, wherein said protrusions are substantially hemispherical. 6. A nuclear power plant emergency core cooling system as in claim 4, further comprising a plurality of substantially uniform depressions alternating in said pattern with said protrusions, said depressions being substantially hemispherical. 7. A nuclear power plant emergency core cooling system as in claim 1, wherein said contouring members comprise a plurality of substantially similar corrugations in at least said perforated portions of said major surfaces. 8. A nuclear power plant emergency core cooling system as in claim 1, further comprising: a plurality of said strainer elements, each including substantially planar said strainer members defining a hollow disc, wherein said strainer includes plural said discs disposed in a stack with an external side of a major surface of one said disc facing an external side of a major surface of an adjacent said disc; and a plurality of connecting tubes disposed between said discs for placing said interior spaces of said discs in fluid communication, wherein said suction opening comprises a connection to said interior space of one of said discs at one end of said stack. 9. A nuclear power plant emergency core cooling system as in claim 8, wherein said connecting tubes are disposed along edges of said discs. 10. A nuclear power plant emergency core cooling system as in claim 8, wherein said connecting tubes are disposed proximate to a center of said major surfaces of said discs. 11. A nuclear power plant emergency core cooling system as in claim 8, wherein said major surfaces of said discs are generally circular. 12. A nuclear power plant emergency core cooling system as in claim 8, wherein said major surfaces of said discs are polygonal. 13. A nuclear power plant emergency core cooling system as in claim 8, wherein said connecting tubes are generally circular in cross section. 14. A nuclear power plant emergency core cooling system as in claim 8, wherein: said stack is disposed along an axis; each said disc includes a first disc part having a fluid opening and a second disc part having a fluid opening, said first and second disc parts forming said disc with a fluid opening formed at said axis by said fluid openings in said disc parts; said suction opening comprises said fluid opening said at said disc at said one end of said stack; said connecting tubes place said fluid openings of facing said discs in fluid communication; and at least one structural member secures said discs together and holds said connecting tubes in place between said discs. 15. A nuclear power plant emergency core cooling system as in claim 14, wherein each said disc includes a core flow regulator extending between said fluid openings in said first and second disc parts for regulating fluid flow from said interior space into said connecting tubes. 16. A nuclear power plant emergency core cooling system as in claim 15, wherein: said fluid openings are disposed proximate to a center of said major surfaces of said disc parts to define a central axis of said strainer; and said core flow regulator comprises a tubular core boss secured in said fluid openings of said disc parts and having at least one aperture placing said interior space in fluid communication with a central strainer core formed by said tubular core bosses and said connecting tubes. 17. A nuclear power plant emergency core cooling system as in claim 16, wherein said aperture is a slot extending generally axially along said core boss. 18. A nuclear power plant emergency core cooling system as in claim 16, wherein said aperture is smaller in said core boss in a said disc further from said one end of said stack than in said adjacent disc closer to said one end of said stack. 19. A nuclear power plant emergency core cooling system as in claim 14, wherein: said first and second disc parts each include a substantially planar, perforated major surface having the same planform with four straight sides and flanges at the periphery of said planform, said flanges of one said disc part fitting within said flanges of the other said disc part to form sides of each said disc and said disc parts including corner openings proximate to the corners of said four-sided planform; at least one of said disc parts includes support spacers attached to said interior major surface thereof and bearing against said facing interior major surface of the other of said disc part; and said strainer includes a plurality of said structural members, each comprising a tie rod extending through said corner openings and urging said strainer discs together with said connecting tubes compressed therebetween. 20. A nuclear power plant emergency core cooling system as in claim 19, wherein said planform is rectangular. 21. A nuclear power plant emergency core cooling system as in claim 19, wherein at least one of each of said first and second disc parts includes a reinforcing boss at each said corner opening. 22. A nuclear power plant emergency core cooling system as in claim 21, wherein said plurality of structural members further includes stiffener beams connected to said periphery of said strainer discs. 23. A nuclear power plant emergency core cooling system as in claim 19, wherein each said disc includes a tubular core boss secured in said fluid openings of said disc parts, said core boss having at least one aperture placing said interior space of said disc in fluid communication with a central strainer core formed by said tubular core bosses and said connecting tubes and regulating fluid flow from said interior space to said central strainer core. 24. A nuclear power plant emergency core cooling system as in claim 23, wherein said tubular core boss comprises a circular cylinder with a slot extending generally axially along said core boss, and ends of said core boss protrude axially from said discs and extend into said connecting tubes. 25. A nuclear power plant emergency core cooling system that circulates cooling water during a power plant loss of cooling accident, said cooling system having therein a strainer comprising: a strainer element for immersion in the cooling water during the loss of cooling accident, said strainer element including at least two strainer members, each said strainer member having a continuous major surface with a plurality of perforations therethrough distributed on at least a portion of said major surface for straining fibrous debris from cooling water passing through said perforations during the loss of cooling accident, wherein said strainer members are disposed with said major surfaces in spaced apart relation to form a hollow interior space with external sides of said major surfaces facing the cooling water during the loss of cooling accident; and a suction opening operatively connected between an emergency core cooling system pump and said interior space for drawing the cooling water into said interior space from said external sides through said perforations, wherein said external sides of said major surfaces have on at least said perforated portions of said major surfaces at least one of a wire mesh cloth covering said portions, a plurality of protrusions on said portions, a plurality of protrusions on said portions and a plurality of depressions in said portions alternating in a pattern with said protrusions, and a plurality of corrugations on said portions. 26. A nuclear power plant emergency core cooling system as in claim 25, further comprising: a plurality of said strainer elements, each including substantially planar said strainer members defining a hollow disc, wherein said strainer includes plural said discs disposed in a stack with an external side of a major surface of one said disc facing an external side of a major surface of an adjacent said disc; and a plurality of connecting tubes disposed between said discs for placing said interior spaces of said discs in fluid communication, wherein said suction opening comprises a fluid connection to said interior space of one of said discs at one end of said stack.
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