JP6757702B2 - Condensate storage facility - Google Patents

Condensate storage facility Download PDF

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JP6757702B2
JP6757702B2 JP2017150582A JP2017150582A JP6757702B2 JP 6757702 B2 JP6757702 B2 JP 6757702B2 JP 2017150582 A JP2017150582 A JP 2017150582A JP 2017150582 A JP2017150582 A JP 2017150582A JP 6757702 B2 JP6757702 B2 JP 6757702B2
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condensate storage
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storage facility
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cst
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圭人 植崎
圭人 植崎
晴彦 池田
晴彦 池田
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Hitachi GE Nuclear Energy Ltd
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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
    • G21C15/18—Emergency cooling arrangements; Removing shut-down heat
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining
    • G21C17/02—Devices or arrangements for monitoring coolant or moderator
    • G21C17/035—Moderator- or coolant-level detecting devices
    • 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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  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
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Description

本発明は、復水貯蔵設備に係り、特に原子力発電プラントの復水貯蔵設備の系統構成に関する。 The present invention relates to a condensate storage facility, and more particularly to a system configuration of a condensate storage facility of a nuclear power plant.

原子力プラントで用いられる復水貯蔵タンクまたは復水貯蔵槽（以下ＣＳＴと称する）は、プラントで使用する水を一時貯蔵しておくための設備であり、多目的な機能と巨大な容積を持つ復水貯蔵設備である。ＣＳＴは、プラントの非常用水の貯蔵機能や、系統・機器への給水、水張り、他系統の水の受け入れといった常用水の貯蔵機能を持つ。 The condensate storage tank or condensate storage tank (hereinafter referred to as CST) used in a nuclear plant is a facility for temporarily storing the water used in the plant, and has a versatile function and a huge volume of condensate. It is a storage facility. The CST has a storage function for emergency water in a plant, and a storage function for regular water such as water supply to systems and equipment, water filling, and acceptance of water from other systems.

復水貯蔵設備として、単一のＣＳＴから構成される系統構成と、非常用水を貯蔵する非常用ＣＳＴおよび常用水を貯蔵する常用ＣＳＴが分離されて設置される系統構成がそれぞれ公知である。 As the condensate storage facility, a system configuration composed of a single CST and a system configuration in which an emergency CST for storing emergency water and a regular CST for storing regular water are separately installed are known.

単一のＣＳＴでは、ＣＳＴ下部に貯蔵される水が非常用水源として常に一定量確保され、ＣＳＴ上部の水が常用水源として利用される。ＣＳＴ下部に非常用復水供給配管、ＣＳＴ中腹に常用復水供給配管を有する構成となっている（非特許文献１）。 In a single CST, a certain amount of water stored in the lower part of the CST is always secured as an emergency water source, and the water in the upper part of the CST is used as a regular water source. It has an emergency condensate supply pipe at the bottom of the CST and a regular condensate supply pipe at the middle of the CST (Non-Patent Document 1).

非常用ＣＳＴと常用ＣＳＴが分離されて設置された復水貯蔵設備として、例えば、特許文献１に記載のように、常用ＣＳＴと非常用ＣＳＴの接続ラインを設け、通常運転中は待機状態にある非常用ＣＳＴに貯蔵された水（非常用水）の水質浄化および水位制御のために、非常用ＣＳＴの非常用水の一部を常用ＣＳＴに回収して浄化し、常用ＣＳＴから非常用ＣＳＴへ水の補給を行うことが提案されている。常用ＣＳＴと非常用ＣＳＴの接続ラインを設け、常用ＣＳＴから非常用ＣＳＴへ水の補給を行うようにしたものとしては、他に特許文献２や特許文献３に記載のものがある。 As a condensate storage facility in which the emergency CST and the regular CST are installed separately, for example, as described in Patent Document 1, a connection line between the regular CST and the emergency CST is provided, and the emergency CST is in a standby state during normal operation. In order to purify the water quality and control the water level of the water stored in the emergency CST (emergency water), a part of the emergency water of the emergency CST is collected and purified in the regular CST, and the water is changed from the regular CST to the emergency CST. It is proposed to replenish. Other examples described in Patent Document 2 and Patent Document 3 include those provided with a connection line between the regular CST and the emergency CST so as to replenish water from the regular CST to the emergency CST.

特開２０００−２０６２８４号公報Japanese Unexamined Patent Publication No. 2000-206284 特開平１０−３０７１９９号公報Japanese Unexamined Patent Publication No. 10-307199 特開２０１２−０１８００９号公報Japanese Unexamined Patent Publication No. 2012-018009

軽水炉発電のあらまし 財団法人原子力安全研究協会 P102、図2.11.1Summary of Light Water Reactor Power Generation Nuclear Safety Research Association P102, Figure 2.11.1

単一のＣＳＴの系統構成では、非常時において常用水源を非常用水源としても利用ができる深層防護の機能を有していると言える。 It can be said that a single CST system configuration has a defense in depth function that allows the regular water source to be used as an emergency water source in an emergency.

しかし、特許文献１などに記載の非常用ＣＳＴと常用ＣＳＴが別個に設置された復水貯蔵設備の系統構成では、プラント内の設備の配置性に優れているが、ポンプを用いて常用ＣＳＴに貯蔵された水（常用水）を非常用ＣＳＴに送水しているため、外部電源喪失などを伴う非常時において、常用水を非常用水として利用する深層防護の機能を喪失する可能性がある。また、ポンプ動力に非常用電源を用いる場合には、非常用電源にかかる負荷が大きくなる。 However, in the system configuration of the condensate storage facility in which the emergency CST and the regular CST are separately installed as described in Patent Document 1 and the like, the arrangement of the facilities in the plant is excellent, but the pump is used to make the regular CST. Since the stored water (regular water) is sent to the emergency CST, there is a possibility that the defense in depth function of using the regular water as emergency water may be lost in an emergency accompanied by loss of external power supply. Further, when an emergency power supply is used for pump power, the load applied to the emergency power supply becomes large.

本発明の目的は、常用ＣＳＴと非常用ＣＳＴが別個に設置された復水貯蔵設備において、非常時において常用水を非常用水としても利用ができる深層防護の機能を有する復水貯蔵設備を提供することにある。 An object of the present invention is to provide a condensate storage facility having a function of defense in depth, which can be used as emergency water in an emergency in a condensate storage facility in which a regular CST and an emergency CST are separately installed. There is.

本発明は、常用ＣＳＴと非常用ＣＳＴが別個に設置された復水貯蔵設備において、常用ＣＳＴと非常用ＣＳＴが、フェールオープン機能を有する弁（ＦＯ弁）を設けた管路によって接続され、ＦＯ弁が開の際に静水頭差によって常用ＣＳＴ内の水を非常用ＣＳＴに送水するようにしたことを特徴とする。 According to the present invention, in a condensate storage facility in which a regular CST and an emergency CST are separately installed, the regular CST and the emergency CST are connected by a pipeline provided with a valve (FO valve) having a fail-open function, and the FO. It is characterized in that when the valve is opened, the water in the regular CST is sent to the emergency CST due to the difference in the hydrostatic head.

本発明によれば、非常用ＣＳＴと常用ＣＳＴが別個に設置された復水貯蔵設備において、非常時において静水頭差によって常用ＣＳＴ内の水が非常用ＣＳＴに移動するようになり、非常時において常用水を非常用水として利用することが可能な深層防護の機能を有する系統構成を実現できる。これにより、原子力発電プラントの安全性をより向上させることができる。 According to the present invention, in a condensate storage facility in which an emergency CST and a regular CST are separately installed, the water in the regular CST moves to the emergency CST in an emergency due to a hydrostatic head difference. It is possible to realize a system configuration having a defense in depth function that enables the use of regular water as emergency water. As a result, the safety of the nuclear power plant can be further improved.

上記した以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。 Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

本発明の実施例１の復水貯蔵設備の全体構成を説明する図である。It is a figure explaining the whole structure of the condensate storage facility of Example 1 of this invention. 本発明の実施例２の復水貯蔵設備の全体構成を説明する図である。It is a figure explaining the whole structure of the condensate storage facility of Example 2 of this invention.

先ず、本発明に至った経緯を説明する。
非常用ＣＳＴと常用ＣＳＴを別個に配置している特許文献１〜３では、通常運転時における非常用水の浄化ために、ポンプが設けられた管路によって非常用ＣＳＴと常用ＣＳＴを接続している。すなわち、特許文献１〜３では非常時に常用水を非常用水として利用する深層防護の機能について考慮されていない。しかし、非常用ＣＳＴと常用ＣＳＴを別個に設置した復水貯蔵設備においても、単一のＣＳＴの系統構成のように、非常時において常用水源を非常用水源としても利用ができる深層防護の機能を有するようにすることが重要である。 First, the background to the present invention will be described.
In Patent Documents 1 to 3 in which the emergency CST and the regular CST are separately arranged, the emergency CST and the regular CST are connected by a pipeline provided with a pump in order to purify the emergency water during normal operation. .. That is, Patent Documents 1 to 3 do not consider the defense-in-depth function of using regular water as emergency water in an emergency. However, even in a condensate storage facility where an emergency CST and a regular CST are installed separately, a defense in depth function that allows the regular water source to be used as an emergency water source in an emergency, such as a single CST system configuration, is provided. It is important to have.

そして、上述したように、従来の非常用ＣＳＴと常用ＣＳＴが分離されて設置された復水貯蔵設備では、ポンプを用いて常用ＣＳＴの常用水を非常用ＣＳＴに送水しているため、外部電源喪失などを伴う非常時において、常用水を非常用水として利用する深層防護の機能を喪失する可能性がある。外部電源喪失を考慮してポンプ動力に非常用電源を用いる構成が考えられる。しかしながら、この場合、非常用電源にかかる負荷が大きくなる。ポンプ動力に非常用電源を用いる構成は、能動的に深層防護の機能を得る構成であると言える。本発明者らは、能動的に深層防護機能を得る構成ではなく、受動的な深層防護の機能を得る構成が有効であるとの着想に基づき、本発明の構成に至ったものである。そして、本発明では、常用ＣＳＴと非常用ＣＳＴをＦＯ弁が設けられた管路によって接続し、静水頭差によって常用ＣＳＴ内の水を非常用ＣＳＴに送水するようにすることにより、ポンプなどの動力を必要とする大規模な機器を用いずに、受動的な深層防護の機能を実現するようにしたものである。
以下、図面を参照しながら本発明の実施例を説明する。 As described above, in the condensate storage facility in which the conventional emergency CST and the regular CST are installed separately, the regular water of the regular CST is sent to the emergency CST by using a pump, so that an external power source is used. In an emergency accompanied by loss, there is a possibility that the defense in depth function of using regular water as emergency water will be lost. Considering the loss of external power supply, it is conceivable to use an emergency power supply for pump power. However, in this case, the load on the emergency power supply becomes large. It can be said that the configuration using the emergency power supply for the pump power is the configuration that actively obtains the function of defense in depth. The present inventors have arrived at the configuration of the present invention based on the idea that a configuration for obtaining a passive defense-in-depth function is effective rather than a configuration for actively obtaining a defense-in-depth function. Then, in the present invention, the regular CST and the emergency CST are connected by a pipeline provided with the FO valve, and the water in the regular CST is sent to the emergency CST by the hydrostatic head difference. It is designed to realize the function of passive defense in depth without using large-scale equipment that requires power.
Hereinafter, examples of the present invention will be described with reference to the drawings.

図１は、本発明の実施例１に係る復水貯蔵設備を模式的に示す図である。
ＣＳＴの主要な機能は以下の通りである。非常用ＣＳＴは１の機能を有し、常用ＣＳＴは２〜５の機能を有している。通常、常用ＣＳＴは非常用ＣＳＴの２〜３倍程度の容量を有する。
１．原子炉冷却用の非常用水源
２．プラント停止中の原子炉ウェル水張り水源
３．プラント構成機器への洗浄水、水張り水、補給水などの供給
４．復水給水系への水張り、およびプラント停止中の復水給水受け入れ
５．廃棄物処理系の処理済水受け入れ
本実施例の復水貯蔵設備は、給水、水張り、他系統の水の受け入れなどを目的として用いられる常用ＣＳＴ１０１と、非常用水の確保を目的として用いられる非常用ＣＳＴ１０２に分離され、別個に設置されている。 FIG. 1 is a diagram schematically showing a condensate storage facility according to a first embodiment of the present invention.
The main functions of CST are as follows. The emergency CST has 1 function, and the regular CST has 2 to 5 functions. Usually, the regular CST has a capacity of about 2 to 3 times that of the emergency CST.
1. 1. Emergency water source for cooling the reactor 2. Reactor well flooded water source when the plant is shut down 3. Supply of wash water, flooded water, make-up water, etc. to plant components 4. 4. Filling the condensate water supply system and accepting condensate water supply when the plant is stopped. Acceptance of treated water in the waste treatment system The condensate storage facility of this example is the regular CST101 used for the purpose of water supply, water filling, acceptance of water of other systems, etc., and the emergency use for the purpose of securing emergency water. It is separated into CST102 and installed separately.

常用ＣＳＴ１０１には、他系統からの流入水を受け入れる流入水受け入れライン２０１とプラント構成機器などへの送水を行う常用水供給ライン２０２が接続されている。常用水供給ライン２０２はポンプ（図示省略）が設けられている。 The regular CST 101 is connected to an inflow water receiving line 201 that receives inflow water from another system and a regular water supply line 202 that sends water to plant components and the like. The regular water supply line 202 is provided with a pump (not shown).

非常用ＣＳＴ１０２には、非常用水供給ライン２０３が接続されている。非常用水供給ライン２０３にはポンプ（図示省略）が設けられている。このポンプは外部電源喪失などの場合でも非常用電源で駆動できるように構成されている。 An emergency water supply line 203 is connected to the emergency CST 102. The emergency water supply line 203 is provided with a pump (not shown). This pump is configured to be driven by an emergency power supply even in the event of loss of external power supply.

本実施例では、常用ＣＳＴ１０１が非常用ＣＳＴ１０２よりも高所に配置され、かつ常用ＣＳＴ１０１下部と非常用ＣＳＴ１０２上部がＦＯ弁３０１を設けた管路（常用ＣＳＴ‐非常用ＣＳＴ接続ライン２０４）で接続されている。常用ＣＳＴ‐非常用ＣＳＴ接続ライン２０４にはポンプが設けられていない。また、同ライン２０４には、非常時に常用ＣＳＴ側から非常用ＣＳＴ側へ水が移動するのに障害となる機器が設けられていない。 In this embodiment, the regular CST101 is arranged at a higher position than the emergency CST102, and the lower part of the regular CST101 and the upper part of the emergency CST102 are connected by a pipeline (regular CST-emergency CST connection line 204) provided with the FO valve 301. Has been done. There is no pump on the regular CST-emergency CST connection line 204. Further, the line 204 is not provided with a device that hinders the movement of water from the regular CST side to the emergency CST side in an emergency.

ＦＯ弁は、フェールオープン機能を有する弁であり、通常時は閉となっており、プラント電源喪失時、自動で開となる弁を意味する。従って、本実施例では、電源喪失を伴う非常時において、ＦＯ弁３０１が開となることから、静水頭差によって常用ＣＳＴ１０１内の水が非常用ＣＳＴ１０２に移動する。したがって、本実施例では、常用水を非常用水源としても利用可能な深層防護の機能を有する。また、本実施例では、常用ＣＳＴ１０１から非常用ＣＳＴ１０２への送水にポンプのような電源を必要とする機器を用いていないので、深層防護の機能は受動的なものと言える。すなわち、深層防護の機能を得るためにポンプを用いていない。ポンプを用いた場合、非常用電源を必要とする。非常用電源は原子炉に給水するためのポンプなどを駆動するために用いるものである。常用ＣＳＴ１０１から非常用ＣＳＴ１０２への送水のために非常用電源を用いた場合、非常用電源を消費してしまうことになり、原子炉への給水を行うポンプの駆動に影響が出るので、非常用電源を大きなものとする必要がある。本実施例では非常用電源を用いないで深層防護の機能を実現するものである。 The FO valve is a valve having a fail-open function, which is normally closed and automatically opens when the plant power is lost. Therefore, in this embodiment, since the FO valve 301 is opened in an emergency accompanied by a power loss, the water in the regular CST 101 moves to the emergency CST 102 due to the hydrostatic head difference. Therefore, in this embodiment, it has a defense in depth function that can use regular water as an emergency water source. Further, in this embodiment, since a device such as a pump that requires a power source for water supply from the regular CST101 to the emergency CST102 is not used, it can be said that the defense in depth function is passive. That is, no pump is used to obtain the function of defense in depth. When using a pump, an emergency power supply is required. The emergency power supply is used to drive a pump or the like for supplying water to the reactor. If an emergency power supply is used to send water from the regular CST101 to the emergency CST102, the emergency power supply will be consumed and the drive of the pump that supplies water to the reactor will be affected. The power supply needs to be large. In this embodiment, the function of defense in depth is realized without using an emergency power supply.

本実施例では、常用ＣＳＴ１０１下部と非常用ＣＳＴ１０２上部を接続している。このため、非常用ＣＳＴ１０２内の非常用水が常用水ＣＳＴ１０１に流出することがない。これにより、非常用水源喪失のリスクが解消される。なお、この効果を得るために、常用ＣＳＴ‐非常用ＣＳＴ接続ライン２０４の非常用ＣＳＴ１０２への接続口を非常用ＣＳＴ１０２の水位よりも高い位置とし、常用水ＣＳＴ１０１への接続口の位置を、非常用ＣＳＴ１０２への接続口よりも高い位置とするのが望ましい。また、非常用ＣＳＴは水源喪失のリスクをなくすために例えば炭素鋼により形成された常用ＣＳＴよりも強固な部材（例えばステンレス鋼）で構成される。このため、例えば、非常用ＣＳＴの下部に配管を漏水が生じないように接続することは容易でない。従って、常用ＣＳＴ‐非常用ＣＳＴ接続ライン２０４の非常用ＣＳＴ１０２への接続（送水の供給口）を非常用ＣＳＴ１０２の上部にすることは漏水リスクの低減にも有効である。 In this embodiment, the lower part of the regular CST101 and the upper part of the emergency CST102 are connected. Therefore, the emergency water in the emergency CST 102 does not flow out to the regular water CST 101. This eliminates the risk of loss of emergency water sources. In order to obtain this effect, the connection port of the regular CST-emergency CST connection line 204 to the emergency CST102 is set to a position higher than the water level of the emergency CST102, and the position of the connection port to the regular water CST101 is set to very high. It is desirable that the position is higher than the connection port to the CST 102. In addition, the emergency CST is composed of a member (for example, stainless steel) stronger than the regular CST made of carbon steel, for example, in order to eliminate the risk of water source loss. Therefore, for example, it is not easy to connect the pipe to the lower part of the emergency CST so as not to cause water leakage. Therefore, setting the connection (water supply port) of the regular CST-emergency CST connection line 204 to the emergency CST 102 at the upper part of the emergency CST 102 is also effective in reducing the risk of water leakage.

また、本実施例では、非常用ＣＳＴ１０２における水位調節を以下のような構成により実現している。
すなわち、非常用ＣＳＴ内の水位を検出するために、非常用ＣＳＴ１０２にはレベルスイッチ（リミットスイッチ）４０２が設けられている。また、ＦＯ弁３０１は、圧縮空気で閉方向に動作するように構成された空気動作（Air Operation）弁でもあり、ＦＯ弁３０１には蓄圧器４０１が接続されている。レベルスイッチ４０２で非常用ＣＳＴ１０２内の非常用水の水位を検出し、所定の上限水位を検知したら、蓄圧器４０１からの圧縮空気がＦＯ弁３０１の駆動部に供給されるようになっている。これにより、ＦＯ弁３０１が閉じて、非常用ＣＳＴ１０２におけるオーバーフローを防止する。本実施例は、水位調節のためのラインと非常時に常用ＣＳＴ１０１から非常用ＣＳＴ１０２へ送水して深層防護の機能を実現するためのラインを一つのラインで実現するようにしており、安全性をより向上させながら、コスト低減も可能としたものと言える。 Further, in this embodiment, the water level adjustment in the emergency CST 102 is realized by the following configuration.
That is, in order to detect the water level in the emergency CST, the emergency CST 102 is provided with a level switch (limit switch) 402. Further, the FO valve 301 is also an air operation valve configured to operate in the closed direction with compressed air, and a pressure accumulator 401 is connected to the FO valve 301. When the level switch 402 detects the water level of the emergency water in the emergency CST 102 and detects a predetermined upper limit water level, the compressed air from the accumulator 401 is supplied to the drive unit of the FO valve 301. As a result, the FO valve 301 is closed to prevent overflow in the emergency CST 102. In this embodiment, a line for adjusting the water level and a line for sending water from the regular CST101 to the emergency CST102 in an emergency to realize the function of defense in depth are realized in one line, and the safety is further improved. It can be said that it is possible to reduce costs while improving.

本実施例では、常用ＣＳＴ１０１及び非常用ＣＳＴ１０２を共にタンクにより構成しても良いが、非常用ＣＳＴ１０２をプールとして構成するのが望ましい。すなわち、常用ＣＳＴ１０１をタンク（容器）とし、地面若しくは高所に設置し、非常用ＣＳＴ１０２を常用ＣＳＴ１０１よりも低所に位置するように地下若しくは地面にプールとして据え付ける。非常用ＣＳＴ１０２は、例えば、コンクリートにより枠体が形成され、内部にステンレス鋼の内張り材が施された構成とする。 In this embodiment, both the regular CST101 and the emergency CST102 may be configured by a tank, but it is desirable to configure the emergency CST102 as a pool. That is, the regular CST101 is used as a tank (container) and installed on the ground or in a high place, and the emergency CST102 is installed underground or in the ground as a pool so as to be located at a lower place than the regular CST101. The emergency CST102 has, for example, a structure in which a frame is formed of concrete and a stainless steel lining material is provided inside.

図２は、本発明の実施例２に係る復水貯蔵設備を模式的に示す図である。実施例１と共通な部分についての説明は省略する。
実施例２では、常用ＣＳＴ１０１及び非常用ＣＳＴ１０２が共にタンクにより構成されている。常用ＣＳＴ１０１下部と非常用ＣＳＴ１０２下部が、常用ＣＳＴ‐非常用ＣＳＴ接続ライン２０４により接続されている。常用ＣＳＴ‐非常用ＣＳＴ接続ライン２０４の非常用ＣＳＴ１０２への接続を容易にするため、非常用ＣＳＴ１０２は炭素鋼で構成されている。また、常用ＣＳＴ１０１と非常用ＣＳＴ１０２は略同一レベルに設置されており、例えば、同一建屋内に設置されている。本実施例では、常用ＣＳＴ‐非常用ＣＳＴ接続ライン２０４に、ＦＯ弁３０１と逆止弁３０２が設けられている。また、同ライン２０４には、実施例１と同様に、非常時に常用ＣＳＴ側から非常用ＣＳＴ側へ水が移動するのに障害となる機器が設けられていない。 FIG. 2 is a diagram schematically showing a condensate storage facility according to a second embodiment of the present invention. The description of the parts common to the first embodiment will be omitted.
In the second embodiment, both the regular CST101 and the emergency CST102 are configured by a tank. The lower part of the regular CST101 and the lower part of the emergency CST102 are connected by the regular CST-emergency CST connection line 204. The emergency CST 102 is made of carbon steel to facilitate the connection of the regular CST-emergency CST connection line 204 to the emergency CST 102. Further, the regular CST101 and the emergency CST102 are installed at substantially the same level, for example, they are installed in the same building. In this embodiment, the regular CST-emergency CST connection line 204 is provided with a FO valve 301 and a check valve 302. Further, the same line 204 is not provided with a device that hinders the movement of water from the regular CST side to the emergency CST side in an emergency, as in the first embodiment.

非常用ＣＳＴ１０２は常用ＣＳＴ１０１に比べ容積が十分に小さくなることから、同一レベルに設置されていても、電源喪失を伴う非常時において、常用ＣＳＴ１０１の常用水は水頭差により非常用ＣＳＴ１０２に流入する。従って、非常時に常用ＣＳＴ‐非常用ＣＳＴ接続ライン２０４を通じて常用ＣＳＴ１０１から非常用ＣＳＴ１０２へ自動で水が流入する。すなわち、本実施例においても常用水を非常用水源としても利用可能な深層防護の機能を有する。また、逆止弁３０２は、非常用ＣＳＴ１０２から常用ＣＳＴ１０１への流れを止めるもので、逆止弁３０２により、常用ＣＳＴ‐非常用ＣＳＴ接続ライン２０４を通じて非常用ＣＳＴ１０２内の非常用水が常用ＣＳＴ１０１に流出することによる非常用水源喪失のリスクが低減する。 Since the volume of the emergency CST102 is sufficiently smaller than that of the regular CST101, even if the emergency CST102 is installed at the same level, the regular water of the regular CST101 flows into the emergency CST102 due to the head difference in an emergency accompanied by a power loss. Therefore, in an emergency, water automatically flows from the regular CST 101 to the emergency CST 102 through the regular CST-emergency CST connection line 204. That is, also in this embodiment, it has a defense in depth function that can use regular water as an emergency water source. Further, the check valve 302 stops the flow from the emergency CST 102 to the regular CST 101, and the check valve 302 causes the emergency water in the emergency CST 102 to flow out to the regular CST 101 through the regular CST-emergency CST connection line 204. The risk of loss of emergency water sources is reduced.

なお、本発明は上記した実施例に限定されるものではなく、様々な変形例が含まれる。例えば、上記した実施例は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施例の構成の一部を他の実施例の構成に置き換えることが可能であり、また、ある実施例の構成に他の実施例の構成を加えることも可能である。また、各実施例の構成の一部について、他の構成の追加，削除，置換をすることが可能である。 The present invention is not limited to the above-described examples, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

１０１：常用ＣＳＴ
１０２：非常用ＣＳＴ
２０１：流入水受け入れライン
２０２：常用水供給ライン
２０３：非常用水供給ライン
２０４：常用ＣＳＴ‐非常用ＣＳＴ接続ライン
３０１：ＦＯ弁
３０２：逆止弁
４０１：蓄圧器
４０２：レベルスイッチ 101: Regular CST
102: Emergency CST
201: Inflow water receiving line 202: Regular water supply line 203: Emergency water supply line 204: Regular CST-Emergency CST connection line 301: FO valve 302: Check valve 401: Accumulator 402: Level switch

Claims (6)

復水貯蔵タンクまたは復水貯蔵槽より構成された復水貯蔵設備として常用復水貯蔵設備と非常用復水貯蔵設備が別個に設置された復水貯蔵設備において、
前記常用復水貯蔵設備と前記非常用復水貯蔵設備が、フェールオープン機能を有する弁を設けた管路によって接続されており、
前記フェールオープン機能を有する弁が開の際に静水頭差によって前記常用復水貯蔵設備内の常用水を前記非常用復水貯蔵設備に送水するようにし、
前記フェールオープン機能を有する弁は蓄圧装置からの圧縮空気により閉じる方向に駆動される空気動作弁として構成されており、前記非常用復水貯蔵設備に設けた水位を検出するレベルスイッチが上限水位を検出した際に閉じるように構成されていることを特徴とする復水貯蔵設備。 In a condensate storage facility in which a regular condensate storage facility and an emergency condensate storage facility are separately installed as a condensate storage facility composed of a condensate storage tank or a condensate storage tank.
The regular condensate storage facility and the emergency condensate storage facility are connected by a pipeline provided with a valve having a fail-open function.
When the valve having the fail-open function is opened, the regular water in the regular condensate storage facility is sent to the emergency condensate storage facility by a hydrostatic head difference.
The valve having a fail-open function is configured as an air-operated valve driven in the closing direction by compressed air from the accumulator, and a level switch provided in the emergency condensate storage facility for detecting the water level sets the upper limit water level. A condensate storage facility that is configured to close when detected. 請求項１に記載の復水貯蔵設備において、
前記常用復水貯蔵設備が前記非常用復水貯蔵設備よりも高所に配置されていることを特徴とする復水貯蔵設備。 In the condensate storage facility according to claim 1,
Condensate storage facility, characterized in that said common condensate storage facilities are located in high altitude than the emergency condensate storage facilities. 請求項２に記載の復水貯蔵設備において、
前記フェールオープン機能を有する弁を設けた管路は、前記常用復水貯蔵設備の下部と前記非常用復水貯蔵設備の上部を接続することを特徴とする復水貯蔵設備。 In the condensate storage facility according to claim 2.
The condensate storage facility provided with a valve having a fail-open function connects the lower part of the regular condensate storage facility and the upper part of the emergency condensate storage facility. 復水貯蔵タンクまたは復水貯蔵槽より構成された復水貯蔵設備として常用復水貯蔵設備と非常用復水貯蔵設備が別個に設置された復水貯蔵設備において、
前記常用復水貯蔵設備と前記非常用復水貯蔵設備が、フェールオープン機能を有する弁を設けた管路によって接続されており、
前記フェールオープン機能を有する弁が開の際に静水頭差によって前記常用復水貯蔵設備内の常用水を前記非常用復水貯蔵設備に送水するようにし、
前記フェールオープン機能を有する弁を設けた管路は、前記常用復水貯蔵設備の下部と前記非常用復水貯蔵設備の下部を接続しており、
前記常用復水貯蔵設備と前記非常用復水貯蔵設備は前記フェールオープン機能を有する弁が開の際に静水頭差によって前記常用復水貯蔵設備内の常用水を前記非常用復水貯蔵設備に送水できるように配置されていることを特徴とする復水貯蔵設備。 In a condensate storage facility in which a regular condensate storage facility and an emergency condensate storage facility are separately installed as a condensate storage facility composed of a condensate storage tank or a condensate storage tank.
The regular condensate storage facility and the emergency condensate storage facility are connected by a pipeline provided with a valve having a fail-open function.
When the valve having the fail-open function is opened, the regular water in the regular condensate storage facility is sent to the emergency condensate storage facility by a hydrostatic head difference.
The pipeline provided with the valve having the fail-open function connects the lower part of the regular condensate storage facility and the lower part of the emergency condensate storage facility .
The customary condensate storage facilities and said emergency condensate storage facilities the fail-open function the condensate storage facility emergency the conventional water in the conventional condensate storage features by hydrostatic head difference when the valve is opened with A condensate storage facility characterized by being arranged so that water can be sent. 請求項４に記載の復水貯蔵設備において、
前記フェールオープン機能を有する弁を設けた管路は、前記非常用復水貯蔵設備から前記常用復水貯蔵設備への流れを止める逆止弁を備えていることを特徴とする復水貯蔵設備。 In the condensate storage facility according to claim 4.
The condensate storage facility provided with a valve having a fail-open function is provided with a check valve for stopping the flow from the emergency condensate storage facility to the regular condensate storage facility. 請求項４または５に記載の復水貯蔵設備において、
前記フェールオープン機能を有する弁は蓄圧装置からの圧縮空気により閉じる方向に駆動される空気動作弁として構成されており、前記非常用復水貯蔵設備に設けた水位を検出するレベルスイッチが上限水位を検出した際に閉じるように構成されていることを特徴とする復水貯蔵設備。 In the condensate storage facility according to claim 4 or 5 .
The valve having a fail-open function is configured as an air-operated valve driven in the closing direction by compressed air from the accumulator, and a level switch provided in the emergency condensate storage facility for detecting the water level sets the upper limit water level. A condensate storage facility that is configured to close when detected.
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