• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    ABSTRACTA method and apparatus for an alternative Cooling system used to cool the suppression pool of a Boiling Water ReaCtor (BWR) nuclear reaCtor. The Coolingsystem includes a Cooling Coil in an isolation Condenser loCated at an elevation thatis above the suppression pool. The isolation Condenser is ConneCted to thesuppression pool via inlet and outlet pipes. The system may provide a naturalConveCtion flow of fluids between the suppression pool and the Cooling Coils topassively Cool fluid from the suppression pool Without requiring external eleCtriCalpower.
    公开号:SE1350987A1
    申请号:SE1350987
    申请日:2013-08-28
    公开日:2014-03-13
    发明作者:Robert J Ginsberg；John R Bass；Robert A Ayer；Richard M Rogers
    申请人:Ge Hitachi Nucl Energy America；
    IPC主号:
    专利说明:

    [2] [0002]reactor (BWR) reactor building 5. The suppression pool 2 may be a torus shaped FIG. 1 is a cut-away view of a conventional boiling water nuclear pool that is part of the reactor building primary containment (although it should beunderstood that example embodiments may be applied to other suppression poolconfigurations used in other BWR reactors with different configurations than theone shown in FIG. 1). Specifically, the suppression pool 2 may be an extension ofthe steel primary containment vessel 3, which is located Within the shell 4 of thereactor building 5. The suppression pool 2 may be positioned below the reactor 1and spent fuel pool 10, and is used to limit containment pressure increases duringcertain accidents. In particular, the suppression pool 2 may be used to cool andcondense steam released during plant accidents. For instance, many plant safety /relief valves are designed to discharge steam into the suppression pool 2, tocondense the steam and mitigate undesired pressure increases. Conventionally, aBWR suppression pool 2 is approximately 140 feet in total diameter (i.e., plot plandiameter), with a 30 foot diameter torus shaped shell. During normal operation,the suppression pool 2 usually has suppression pool water in the pool at a depth ofabout 15 feet (with approximately 1,000,000 gallons of suppression pool water inthe suppression pool 2, during normal operation).
    [3] [0003]heat removal (RHR) system of the BWR plant. During normal (non-accident) plant The pool 2 is conventionally cleaned and cooled by the residual conditions, the RHR system can remove water from the suppression pool 2 (usingconventional RHR pumps) and send the water through a demineralizer (not shown)to remove impurities and some radioactive isotopes that may be contained in thewater. During a plant accident, the RHR system is also designed to remove some ofthe suppression pool water from the suppression pool 2 and send the water to aheat exchanger (within the RHR system) for cooling.
    [4] [0004]be disrupted. In particular, the plant may be without normal electrical power to During a serious plant accident, normal plant electrical power may run the conventional RHR system and pumps. If electrical power is disrupted for a lengthy period of time, water in the suppression pool may eventually boil andimpair the ability of the suppression pool to condense plant steam and reducecontainment pressure.
    [5] [0005]radioactive water (above acceptable design limits) to be transferred between the In a plant emergency, use of the RHR system may cause highly suppression pool and RHR systems (located outside of primary containment). Thetransfer of the highly radioactive water between the suppression pool and RHRsystem may, in and of itself, cause a potential escalation in leakage of harmfulradioactive isotopes that may escape the suppression pool. Additionally, radiationdosage rates in areas of the RHR system could be excessively high during anaccident, making it difficult for plant personnel to access and control the system.
    [8] [0008] FIG. 1 is a cut-away view of a conventional boiling water nuclearreactor (BWR) reactor building;
    [9] [0009] FIG. 2 is a cut-away of a boiling water nuclear reactor (BWR)reactor building, in accordance with an example embodiments;
    [10] [0010] FIG. 3 is a diagram of an alternative BWR containment heatremoval system, in accordance with an example embodiment; and
    [11] [0011] FIG. 4 is a flowchart of a method of using an alternative BWR containment heat removal system, in accordance with an example embodiment.
    [12] [0012] Detailed example embodiments are disclosed herein. However,specific structural and functional details disclosed herein are merely representativefor purposes of describing example embodiments. Example embodiments may,however, be embodied in many alternate forms and should not be construed aslimited to only the embodiments set forth herein.
    [13] [0013] modifications and alternative forms, embodiments thereof are shown by way of Accordingly, while example embodiments are capable of various example in the drawings and will herein be described in detail. It should beunderstood, however, that there is no intent to limit example embodiments to theparticular forms disclosed, but to the contrary, example embodiments are to coverall modif1cations, equivalents, and alternatives falling within the scope of exampleembodiments. Like numbers refer to like elements throughout the description ofthe figures.[0014]may be used herein to describe various elements, these elements should not be It Will be understood that, although the terms first, second, etc. limited by these terms. These terms are only used to distinguish one element fromanother. For example, a first element could be termed a second element, and,similarly, a second element could be termed a first element, without departing fromthe scope of example embodiments. As used herein, the term "and / or" includes anyand all combinations of one or more of the associated listed items.
    [15] [0015]"connected" or "coupled" to another element, it may be directly connected or It Will be understood that when an element is referred to as being coupled to the other element or intervening elements may be present. In contrast,when an element is referred to as being "directly connected" or "directly coupled" toanother element, there are no intervening elements present. Other words used todescribe the relationship between elements should be interpreted in a like fashion(e.g., "between" versus "directly between", "adjacent" versus "directly adjacent",etc.).
    [16] [0016]particular embodiments only and is not intended to be limiting of example The terminology used herein is for the purpose of describing embodiments. As used herein, the singular forms "a", "an" and "the" are intended toinclude the plural forms as well, unless the context clearly indicates otherwise. Itwill be further understood that the terms "comprises", "comprising,", "includes"and /or "including", when used herein, specify the presence of stated features,integers, steps, operations, elements, and /or components, but do not preclude thepresence or addition of one or more other features, integers, steps, operations,elements, components, and/ or groups thereof.
    [17] [0017]the functions/ acts noted may occur out of the order noted in the figures. For It should also be noted that in some alternative implementations, example, two figures shown in succession may in fact be executed substantiallyconcurrently or may sometimes be executed in the reverse order, depending uponthe functionality/ acts involved.
    [18] [0018] reactor building, in accordance with an example embodiment. Specifically, an FIG. 2 is a cut-away of a boiling water nuclear reactor (BWR) isolation condenser 20 may be included in a position in the reactor building 5 thatis located above an elevation of the suppression pool 2.
    [19] [0019]removal (ABCHR) system 30, in accordance with an example embodiment. The FIG. 3 is a diagram of an alternative BWR containment heat system may include an isolation condenser 20 (filled with cool water) located at anelevation that is above the suppression pool 2 (see FIG. 2). The isolation condenser20 is located above the suppression pool 2 in order to ensure that a natural convection circulation of fluid may be established between the isolation condenser20 and the suppression pool 2. Cooling coils 40 may be located in the isolationcondenser 20. The cooling coil 40 may be a radiator-type cooling coil.Alternatively, the cooling coil 40 may include branched piping, or anotherconfiguration that increases the surface area between the coil 40 and the water inthe isolation condenser 20.
    [20] [0020] The cooling coils 40 may be connected to the suppression pool 2via outlet and inlet pipes 22/ 24. The outlet pipe 22 may include a manuallyoperated outlet isolation valve 26 that opens and closes the outlet 22 between theisolation condenser 20 and the suppression pool 2. The inlet pipe 24 may alsoinclude a manually operated inlet isolation valve 28 that opens and closes the inlet24 between the isolation condenser 20 and the suppression pool 2. The inlet /outlet isolation valves 26/ 28 may be manually operated to ensure that externalpower need not be required to operate the ABCHR system 30.
    [21] [0021] An outlet pipe discharge point 22a (at the suppression pool 2) ofthe outlet 22 may be positioned at a location that is at or near a top elevation of thesuppression pool 2. Preferably, the outlet discharge point 22a may be locatedabove the normal water level 2a of the suppression pool 2. This ensures that onlyhot steam and/ or water exits the suppression pool 2 via a natural convection flowto be condensed by the cooling coils 40. Likewise, an outlet pipe entry point 22b ofthe outlet 22 may be located at or near a top elevation of the isolation condenser20. The outlet 22 may also be connected at or near a top elevation of the coolingcoils 40. This ensures that the hot steam / water entering coils 40 may becondensed and drain (via gravity) out of the coils 40 and back into the suppressionpool 2. By locating the outlet pipe entry point 22b near a top elevation of theisolation condenser 20, the outlet pipe 22 will also not heat water near a bottomfloor of the isolation condenser 20 (to ensure that the inlet pipe 24 near the inletdischarge point 24a is not inadvertently heated.
    [22] [0022] The inlet pipe discharge point 24a (at the isolation condenser 20)of the inlet 24 may be positioned at a location that is at or near a bottom elevationof the isolation condenser 20. This ensures that only cooler water exits coils 40and drains back into the suppression pool 2. An inlet pipe entry point 24b of theinlet 24 may be located at or near a bottom elevation of the suppression pool 2(preferably, below the normal water level 2a of the suppression pool 2), to ensurethat the cool water entering entry point 24b is separated from the hot steam /water near top elevations of the suppression pool 2.
    [23] [0023] FIG. 4 is a flowchart of a method of using an ABCHR system 30, inaccordance with an example embodiment. Step S40 may include opening theoutlet and inlet isolation valves 22/24 (FIG. 3) of the system 30 to establish anatural convection flow of fluid between the suppression pool 2 and the coolingcoils 40 of the isolation condenser 20. Specifically, step S42 may include allowinghot steam / water to exit the suppression pool 2, via natural convection force, anddischarge into the cooling coils 40 to condense and cool the fluid. Step S344 mayinclude allowing the condensed and cooled fluid to drain, via gravity, from the coils 40 of the isolation condenser 20 back into the suppression pool 2. By performingthis method, a passive means of cooling the fluid of the suppression pool 2 may beestablished Without the need for an external power source.
    [24] [0024] obvious that the same may be varied in many Ways. Such variations are not to be Example embodiments having thus been described, it Will be regarded as a departure from the intended spirit and scope of exampleembodiments, and all such modif1cations as Would be obvious to one skilled in theart are intended to be included Within the scope of the following claims.
    权利要求:
    Claims (13)
    [1] 1. A system, comprising: a suppression pool; an isolation condenser located at an elevation above the suppression pool,the isolation condenser containing cool Water; a cooling coil located in the isolation condenser; and an outlet pipe and an inlet pipe connecting the suppression pool to thecooling coil, Wherein the system operates Without the need for any external power source.
    [2] 2. The system of claim 1, Wherein, the outlet pipe is connected to the suppression pool near a top elevation ofthe suppression pool, the inlet pipe is connected to the suppression pool near a bottom elevation ofthe suppression pool.
    [3] 3. The system of claim 1, further comprising:an outlet isolation valve in the outlet pipe; andan inlet isolation valve in the inlet pipe.
    [4] 4. The system of claim 3, Wherein the outlet and inlet isolation valves are manuallyoperated valves.
    [5] 5. The system of claim 1, Wherein, the outlet pipe is connected to the cooling coil near a top elevation of thecooling coil; the inlet pipe is connected to the cooling coil near a bottom elevation of thecooling coil.
    [6] 6. The system of claim 1, Wherein, the cooling coil is a radiator-type cooling coil, the cooling coil is fully submerged under a normal liquid level of the isolationcondenser.
    [7] 7. A method of making a system, comprising: positioning an isolation condenser at an elevation above a suppression pool,the isolation condenser containing cool Water; placing a cooling coil in the isolation condenser; and connecting the suppression pool and the cooling coil via an inlet pipe and anoutlet pipe, Wherein the system is operated Without the need for an external powersource.
    [8] 8. The method of claim 7, Wherein, the connecting of the suppression pool and the cooling coil includesconnecting the outlet pipe to the suppression pool near a top elevation of thesuppression pool, the connecting of the suppression pool and the cooling coil includesconnecting the inlet pipe to the suppression pool near a bottom elevation of thesuppression pool.
    [9] 9. The method of claim 7, further comprising:placing an outlet isolation valve in the outlet pipe; andplacing an inlet isolation valve in the inlet pipe.
    [10] 10. The method of claim 9, Wherein the outlet and inlet isolation valves aremanually operated valves.
    [11] 11. The method of claim 7, Wherein, the connecting of the suppression pool and the cooling coils includesconnecting the outlet pipe to the cooling coil near a top elevation of the cooling coil, the connecting of the suppression pool and the cooling coil includesconnecting the inlet pipe to the cooling coil near a bottom elevation of the coolingcoil.
    [12] 12. The method of claim 7, Wherein,the placing of the cooling coil in the isolation condenser including fully submerging the cooling coil below a normal liquid level of the isolation condenser,the cooling coil being a radiator-type cooling coil.
    [13] 13. The method of using the system of claim 3, comprising: opening the inlet and outlet isolation valves to establish a natural convectionforce between the suppression pool and the cooling coil; allowing hot fluid from the suppression pool to floW into the cooling coils tocondense and cool the fluid; and draining the condensed and cooled fluid from the cooling coil into thesuppression pool.
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    同族专利:
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    法律状态:
    2015-12-29| NAV| Patent application has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    US13/611,384|US20140072089A1|2012-09-12|2012-09-12|Method and system for an alternative bwr containment heat removal system|
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