JP2019027748A - Condensate storage facility - Google Patents

Condensate storage facility Download PDF

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JP2019027748A
JP2019027748A JP2017150582A JP2017150582A JP2019027748A JP 2019027748 A JP2019027748 A JP 2019027748A JP 2017150582 A JP2017150582 A JP 2017150582A JP 2017150582 A JP2017150582 A JP 2017150582A JP 2019027748 A JP2019027748 A JP 2019027748A
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cst
emergency
water
condensate storage
valve
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JP6757702B2 (en
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圭人 植崎
Yoshito Uezaki
圭人 植崎
晴彦 池田
Haruhiko Ikeda
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)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
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Abstract

To provide a condensate storage facility provided a common use condensate tank (CST) and an emergency CST separately as condensate storage tanks or condensate storage tubs, and having a function of deep protection that the common use water can be used as emergency water in emergency.SOLUTION: In a condensate storage facility provided a common use CST 101 and an emergency CST 102 separately, the common use CST 101 and the emergency CST 102 are connected by a pipe line 204 arranged a valve (FO valve) 301 having fail open function, and when the FO valve 301 is opened, the water in the common use CST 101 is supplied to the emergency CST 102 by static water head difference.SELECTED DRAWING: Figure 1

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。   A condensate storage tank or condensate storage tank (hereinafter referred to as CST) used in a nuclear power plant is a facility for temporarily storing water used in the plant, and has a multipurpose function and a huge capacity. 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 devices, water filling, and reception 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 a condensate storage facility, a system configuration composed of a single CST, a system configuration in which an emergency CST that stores emergency water and a service CST that stores service 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 an ordinary water source. An emergency condensate supply pipe is provided at the lower part of the CST, and an ordinary condensate supply pipe is provided in 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 normal CST are separated and installed, for example, as described in Patent Document 1, a connection line between the normal CST and the emergency CST is provided and is in a standby state during normal operation. In order to purify the water stored in the emergency CST (emergency water) and control the water level, a part of the emergency water in the emergency CST is collected and purified in the regular CST, and water is transferred from the regular CST to the emergency CST. It has been proposed to supply. Others that provide a connection line between the regular CST and the emergency CST and replenish water from the regular CST to the emergency CST include those described in Patent Document 2 and Patent Document 3.

特開２０００−２０６２８４号公報JP 2000-206284 A 特開平１０−３０７１９９号公報JP-A-10-307199 特開２０１２−０１８００９号公報JP 2012-018009 A

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 the system configuration of a single CST has a deep protection function that can 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 described in Patent Document 1 are installed separately, the arrangement of the facilities in the plant is excellent. Since the stored water (ordinary water) is sent to the emergency CST, there is a possibility of losing the function of deep protection that uses the regular water as emergency water in an emergency involving loss of external power. Further, when an emergency power supply is used for pump power, a load applied to the emergency power supply increases.

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 deep protection function that can be used as an emergency water in an emergency in a condensate storage facility in which a service CST and an emergency CST are installed separately. 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。   In the condensate storage facility in which the service CST and the emergency CST are separately installed, the service CST and the emergency CST are connected by a pipe line provided with a valve (FO valve) having a fail-open function. When the valve is opened, the water in the service CST is sent to the emergency CST by the hydrostatic head difference.

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 the condensate storage facility in which the emergency CST and the service CST are installed separately, the water in the service CST moves to the emergency CST due to a hydrostatic head difference in an emergency. It is possible to realize a system configuration having a defense-in-depth function that can use ordinary water as emergency water. Thereby, the safety | security of a nuclear power plant can be improved more.

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。   Problems, configurations, and effects other than those described above will be clarified by the following description of 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 service CST are separately arranged, the emergency CST and the service CST are connected by a pipe line provided with a pump in order to purify the emergency water during normal operation. . In other words, Patent Documents 1 to 3 do not consider the function of deep defense that uses ordinary water as emergency water in an emergency. However, even in the condensate storage facility in which the emergency CST and the service CST are installed separately, the function of deep protection that can use the service water source as an emergency water source in an emergency is provided, as in the system configuration of a single CST. It is important to have it.

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 normal CST are separated and installed, the normal CST normal water is sent to the emergency CST using a pump. In the event of an emergency with loss, etc., there is a possibility of losing the function of defense in depth that uses ordinary water as emergency water. Considering the loss of external power supply, a configuration using an emergency power supply for pump power can be considered. 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 a 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 that obtains a passive depth protection function is effective rather than a configuration that actively obtains a depth protection function. In the present invention, the service CST and the emergency CST are connected by a pipe line provided with an FO valve, and the water in the service CST is sent to the emergency CST by a hydrostatic head difference, so that It is intended to realize a passive defense-in-depth function without using large-scale equipment that requires power.
Embodiments of the present invention will be described below 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 illustrating the condensate storage facility according to the first embodiment of the present invention.
The main functions of CST are as follows. The emergency CST has one function, and the regular CST has two to five functions. Usually, the service CST has a capacity of about 2 to 3 times that of the emergency CST.
1. 1. Emergency water source for reactor cooling 2. Reactor well water-filled water source during plant shutdown 3. Supply of cleaning water, water filling water, makeup water, etc. to plant components 4. Filling the condensate supply system and accepting condensate supply while the plant is stopped Receiving treated water for waste treatment system The condensate storage facility of this embodiment is used for the purpose of securing emergency water and the regular CST101 used for water supply, water filling, receiving water from other systems, etc. 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 other systems and a regular water supply line 202 that supplies 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 so that it can be driven by an emergency power supply even in the event of loss of external power.

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 service CST 101 is arranged at a higher position than the emergency CST 102, and the lower part of the service CST 101 and the upper part of the emergency CST 102 are connected by a pipe line (service CST-emergency CST connection line 204) provided with the FO valve 301 Has been. The service CST-emergency CST connection line 204 is not provided with a pump. In addition, the line 204 is not provided with a device that hinders water from moving from the normal 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 means a valve that is normally closed and is automatically opened when the plant power supply is lost. Therefore, in this embodiment, since the FO valve 301 is opened in an emergency with 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 function of deep defense that can use the regular water as an emergency water source. Further, in this embodiment, since a device that requires a power source such as a pump is not used for water supply from the regular CST 101 to the emergency CST 102, it can be said that the defense-in-depth function is passive. That is, a pump is not used to obtain a deep defense function. When a pump is used, an emergency power supply is required. The emergency power supply is used to drive a pump for supplying water to the nuclear reactor. If an emergency power supply is used to send water from the regular CST 101 to the emergency CST 102, the emergency power supply will be consumed, and this will affect the drive of the pump that supplies water to the reactor. The power supply needs to be large. In this embodiment, the function of deep defense is realized without using an emergency power source.

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 CST 101 and the upper part of the emergency CST 102 are connected. For this reason, the emergency water in the emergency CST 102 does not flow into 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 service CST-emergency CST connection line 204 to the emergency CST 102 is positioned higher than the water level of the emergency CST 102, and the position of the connection port to the service water CST 101 is It is desirable that the position be higher than the connection port to the CST 102 for use. Further, the emergency CST is composed of a member (for example, stainless steel) that is stronger than the regular CST made of carbon steel, for example, in order to eliminate the risk of water source loss. For this reason, for example, it is not easy to connect the piping to the lower part of the emergency CST so that water leakage does not occur. Therefore, it is also effective to reduce the risk of water leakage by connecting the service CST-emergency CST connection line 204 to the emergency CST 102 (the water supply port) above the emergency CST 102.

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。 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. The FO valve 301 is also an air operation valve configured to operate in the closing direction with compressed air, and a pressure accumulator 401 is connected to the FO valve 301. When the level switch 402 detects the level of the emergency water in the emergency CST 102 and detects a predetermined upper limit water level, the compressed air from the pressure accumulator 401 is supplied to the drive unit of the FO valve 301. As a result, the FO valve 301 is closed, and overflow in the emergency CST 102 is prevented. In this embodiment, a line for adjusting the water level and a line for realizing the defense function of the deep layer by supplying water from the regular CST 101 to the emergency CST 102 in an emergency are realized by one line, and the safety is further improved. It can be said that the cost can be reduced 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 CST 101 and the emergency CST 102 may be configured by tanks, but it is desirable to configure the emergency CST 102 as a pool. That is, the regular CST 101 is a tank (container), and is installed on the ground or a high place, and the emergency CST 102 is installed as a pool on the basement or the ground so as to be located lower than the regular CST 101. The emergency CST 102 has, for example, a structure in which a frame is formed of concrete and a stainless steel lining material is applied to the 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 illustrating the condensate storage facility according to the second embodiment of the present invention. A description of parts common to the first embodiment will be omitted.
In the second embodiment, both the regular CST 101 and the emergency CST 102 are constituted by tanks. The lower part of the normal CST 101 and the lower part of the emergency CST 102 are connected by a normal CST-emergency CST connection line 204. In order to facilitate the connection of the service CST-emergency CST connection line 204 to the emergency CST 102, the emergency CST 102 is made of carbon steel. Further, the service CST 101 and the emergency CST 102 are installed at substantially the same level, for example, installed in the same building. In this embodiment, an FO valve 301 and a check valve 302 are provided on the service CST-emergency CST connection line 204. Similarly to the first embodiment, the line 204 is not provided with a device that hinders water from moving from the normal CST side to the emergency CST side in an emergency.

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 CST 102 is sufficiently smaller than that of the service CST 101, even if the emergency CST 102 is installed at the same level, the service water of the service CST 101 flows into the service CST 102 due to a water head difference in an emergency with power loss. Accordingly, in an emergency, water automatically flows from the service CST 101 to the service CST 102 through the service CST-emergency CST connection line 204. In other words, this embodiment also has a defense-in-depth function that can use ordinary water as an emergency water source. The check valve 302 stops the flow from the emergency CST 102 to the service CST 101. The check valve 302 causes the emergency water in the emergency CST 102 to flow out to the service CST 101 through the service CST-emergency CST connection line 204. Reducing the risk of loss of emergency water sources.

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。   In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

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: Common use CST
102: Emergency CST
201: Inflow water receiving line 202: Service water supply line 203: Emergency water supply line 204: Service CST-Emergency CST connection line 301: FO valve 302: Check valve 401: Pressure accumulator 402: Level switch

Claims (6)

復水貯蔵タンクまたは復水貯蔵槽（以下、ＣＳＴと称する）として常用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、
前記常用ＣＳＴと前記非常用ＣＳＴが、フェールオープン機能を有する弁（以下、ＦＯ弁と称する）を設けた管路によって接続されており、
前記ＦＯ弁が開の際に静水頭差によって前記常用ＣＳＴ内の常用水を前記非常用ＣＳＴに送水するようにしたことを特徴とする復水貯蔵設備。 In a condensate storage facility in which a regular CST and an emergency CST are separately installed as a condensate storage tank or a condensate storage tank (hereinafter referred to as CST),
The normal CST and the emergency CST are connected by a pipe provided with a valve having a fail-open function (hereinafter referred to as FO valve),
A condensate storage facility characterized in that, when the FO valve is opened, the normal water in the normal CST is sent to the emergency CST by a hydrostatic head difference. 請求項１に記載の復水貯蔵設備において、
前記常用ＣＳＴが前記非常用ＣＳＴ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,
The condensate storage facility, wherein the regular CST is disposed higher than the emergency CST. 請求項２に記載の復水貯蔵設備において、
前記ＦＯ弁を設けた管路は、前記常用ＣＳＴの下部と前記非常用ＣＳＴ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 characterized in that the pipe line provided with the FO valve connects the lower part of the regular CST and the upper part of the emergency CST. 請求項１に記載の復水貯蔵設備において、
前記ＦＯ弁を設けた管路は、前記常用ＣＳＴの下部と前記非常用ＣＳＴの下部を接続しており、
前記常用ＣＳＴと前記非常用ＣＳＴは前記ＦＯ弁が開の際に静水頭差によって前記常用ＣＳＴ内の常用水を前記非常用ＣＳＴ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 the condensate storage facility according to claim 1,
The pipe line provided with the FO valve connects the lower part of the normal CST and the lower part of the emergency CST,
The normal CST and the emergency CST are arranged so that when the FO valve is opened, the normal water in the normal CST can be sent to the emergency CST by a hydrostatic head difference. Facility. 請求項４に記載の復水貯蔵設備において、
前記ＦＯ弁を設けた管路は、前記非常用ＣＳＴから前記常用ＣＳＴ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 conduit having the FO valve is provided with a check valve for stopping the flow from the emergency CST to the service CST. 請求項１〜５の何れか一項に記載の復水貯蔵設備において、
前記ＦＯ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ＣＳＴ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 any one of claims 1 to 5,
The FO valve is configured as an air operated valve that is driven in a closing direction by compressed air from a pressure accumulator, and is closed when a level switch for detecting a water level provided in the emergency CST detects an upper limit water level. Condensate storage facility characterized in that it is configured.
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