JP2018115970A - Valve closing speed control device, boiling water nuclear electric power plant, and operation method of boiling water nuclear electric power plant - Google Patents

Valve closing speed control device, boiling water nuclear electric power plant, and operation method of boiling water nuclear electric power plant Download PDF

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JP2018115970A
JP2018115970A JP2017007253A JP2017007253A JP2018115970A JP 2018115970 A JP2018115970 A JP 2018115970A JP 2017007253 A JP2017007253 A JP 2017007253A JP 2017007253 A JP2017007253 A JP 2017007253A JP 2018115970 A JP2018115970 A JP 2018115970A
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closing speed
valve
reactor
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power plant
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JP6678606B2 (en
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宏則 近藤
Hironori Kondo
宏則 近藤
純一 北村
Junichi Kitamura
純一 北村
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Hitachi GE Nuclear Energy Ltd
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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
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Abstract

PROBLEM TO BE SOLVED: To provide a valve closing speed control device capable of relaxing an increase in pressure of a nuclear reactor and output of a nuclear reactor generated by closing of a valve, and to provide a boiling water nuclear electric power plant, and an operation method of the boiling water nuclear electric power plant.SOLUTION: A valve closing speed control device 1 includes: a nuclear reactor cooling material void fraction calculation part 2 for calculating a void fraction of a nuclear reactor cooling material within a nuclear reactor container 74; and a valve closing speed calculation part 3 and a valve closing speed change part 4 for monitoring a change in the calculated void fraction, computes the closing speeds of a main steam isolation valve 9A, a steam increase/decrease valve 9B, a main steam stop valve 9C according to the change, and outputs a closing speed S4.SELECTED DRAWING: Figure 3

Description

本発明は、弁閉鎖速度制御装置、沸騰水型原子力発電プラントおよび沸騰水型原子力発電プラントの運転方法に関する。   The present invention relates to a valve closing speed control device, a boiling water nuclear power plant, and a method for operating a boiling water nuclear power plant.

主蒸気隔離弁閉止が原因以外のスクラムに際して、インターナルポンプの一部又は全部のトリップ手段や主蒸気隔離弁閉止設定値の変更手段、及び主蒸気隔離弁閉止設定のブロック手段を設けて、原子炉スクラム時の不要な主蒸気隔離弁の閉止作動と、原子炉水位上昇を回避することを目的として、特許文献１には、複数のインターナルポンプを使用した沸騰水型原子炉で原子炉圧力高等の各事象により前記インターナルポンプの一部をトリップさせる原子炉制御装置において、原子炉スクラムに際して前記インターナルポンプをランバックさせると共に、所定時間後にランバック運転させたインターナルポンプの一部をトリップする手段のタイマーを設けた原子炉制御装置が記載されている。   For scrams other than the main steam isolation valve closing cause, a means for tripping all or part of the internal pump, a means for changing the main steam isolation valve closing set value, and a block means for setting the main steam isolation valve closing are provided. For the purpose of avoiding unnecessary main steam isolation valve closing operation and reactor water level rise during reactor scram, Patent Document 1 describes a reactor pressure in a boiling water reactor using a plurality of internal pumps. In a reactor control apparatus that trips a part of the internal pump by each event such as high, the internal pump is run back during a reactor scram, and a part of the internal pump that is run back after a predetermined time is A reactor control device is described which is provided with a timer for tripping means.

特開平０９−２６４９８９号公報Japanese Patent Laid-Open No. 09-264989

通常運転における原子力発電プラントは、原子炉内の核分裂によって発生する熱を用いて蒸気を発生させ、その蒸気は主蒸気配管を経由してタービンへ送られ、タービンを回転させることによりタービンに直結した発電機にて電気を発生させている。   Nuclear power plants in normal operation generate steam using the heat generated by nuclear fission in the nuclear reactor, and the steam is sent to the turbine via the main steam pipe and directly connected to the turbine by rotating the turbine. Electricity is generated by a generator.

原子力発電プラントの原子炉には、沸騰水型原子炉と加圧水型原子炉との主に２種類の型がある。このうち、沸騰水型原子力発電プラントの場合、原子炉内の核分裂は原子炉冷却材のボイド率（冷却材密度）の変化に依存するため、原子炉冷却材のボイド率を制御することにより発生熱出力を制御、すなわち発生蒸気量を制御している。   There are two main types of nuclear power plant nuclear reactors: boiling water reactors and pressurized water reactors. Of these, in the case of boiling water nuclear power plants, nuclear fission in the nuclear reactor depends on changes in the void ratio (coolant density) of the reactor coolant. The heat output is controlled, that is, the amount of generated steam is controlled.

沸騰水型原子力発電プラントでは、過渡時に主蒸気配管上の弁を閉鎖する機能を有している。例えば、主蒸気配管の破断が生じた場合、主蒸気隔離弁を閉鎖することによって、原子炉を隔離して原子炉冷却材の流出を防ぐようになっている。また、発電機負荷遮断又はタービントリップが生じた場合には、タービン蒸気加減弁又は主蒸気止め弁を閉鎖することにより、タービンの過回転等を防止してタービンを保護するようになっている。   A boiling water nuclear power plant has a function of closing a valve on the main steam pipe during a transition. For example, when the main steam pipe is broken, the main steam isolation valve is closed to isolate the reactor and prevent the reactor coolant from flowing out. In addition, when the generator load is interrupted or the turbine trip occurs, the turbine steam control valve or the main steam stop valve is closed to prevent over-rotation of the turbine and the like to protect the turbine.

しかし、主蒸気隔離弁、タービン蒸気加減弁、および主蒸気止め弁等の主蒸気配管上の弁が閉鎖した場合、原子炉で発生した主蒸気の流れが遮断されるため、原子炉圧力が上昇する。原子炉圧力が上昇すると、原子炉冷却材のボイド率が低下し、炉心に正の反応度が投入されるため、原子炉出力が上昇し、燃料破損に至る可能性がある、との課題がある。   However, when the main steam piping valves such as the main steam isolation valve, turbine steam control valve, and main steam stop valve are closed, the flow of the main steam generated in the reactor is shut off, and the reactor pressure increases. To do. When the reactor pressure increases, the void ratio of the reactor coolant decreases, and positive reactivity is introduced into the core.Therefore, there is a problem that the reactor output increases and fuel damage may occur. is there.

特に、主蒸気配管上の弁の閉鎖速度が早いほど原子炉圧力および原子炉出力が急激に上昇し、また、弁閉鎖時の原子炉冷却材ボイド率が大きいほど、弁閉鎖によるボイド率低下は大きくなる。このため、原子炉圧力および原子炉出力の上昇が大きくなり、同様の課題が生じ得る。   In particular, the faster the valve closing speed on the main steam pipe, the more rapidly the reactor pressure and reactor power increase, and the larger the reactor coolant void ratio when the valve is closed, the lower the void ratio due to valve closing. growing. For this reason, the increase in the reactor pressure and the reactor power becomes large, and the same problem may occur.

本発明は、弁の閉鎖によって生じる原子炉圧力および原子炉出力の上昇を緩和することが可能な弁閉鎖速度制御装置、沸騰水型原子力発電プラントおよび沸騰水型原子力発電プラントの運転方法を提供することを目的とする。   The present invention provides a valve closing speed control device, a boiling water nuclear power plant, and a method for operating a boiling water nuclear power plant that can mitigate increases in reactor pressure and reactor power caused by valve closing. For the purpose.

上記課題を解決するために、例えば特許請求の範囲に記載の構成を採用する。
本発明は、上記課題を解決する手段を複数含んでいるが、その一例を挙げるならば、沸騰水型原子力発電プラントの原子炉とタービンとを連結する主蒸気配管に設けられた弁の閉鎖速度の制御を行う弁閉鎖速度制御装置であって、前記原子炉内の原子炉冷却材のボイド率の変化を監視し、前記変化に応じて前記弁の閉鎖速度を演算し、演算された閉鎖速度で前記弁が閉鎖されるよう前記弁に閉鎖速度信号を出力する演算部と、を備えたことを特徴とする。 In order to solve the above problems, for example, the configuration described in the claims is adopted.
The present invention includes a plurality of means for solving the above-described problems. For example, a closing speed of a valve provided in a main steam pipe connecting a nuclear reactor of a boiling water nuclear power plant and a turbine is described. A valve closing speed control device that controls the change in the void ratio of the reactor coolant in the reactor, calculates the valve closing speed in accordance with the change, and calculates the calculated closing speed And a calculation unit that outputs a closing speed signal to the valve so that the valve is closed.

本発明によれば、主蒸気配管上の弁の閉鎖時に生じる原子炉圧力および原子炉出力の上昇を緩和することが可能となる。上記した以外の課題、構成および効果は、以下の実施形態の説明により明らかにされる。   ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to relieve | moderate the raise of the reactor pressure and reactor power which arise at the time of the valve closing on the main steam piping. Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

本発明を適用する沸騰水型原子力発電プラントの概要の一例を示す図である。It is a figure which shows an example of the outline | summary of the boiling water nuclear power plant to which this invention is applied. 本発明の弁閉鎖速度制御装置を備えた沸騰水型原子力発電プラントのシステム構成の一例を示す図である。It is a figure which shows an example of the system configuration | structure of a boiling water nuclear power plant provided with the valve closing speed control apparatus of this invention. 本発明の弁閉鎖速度制御装置の構成の一例を示す図である。It is a figure which shows an example of a structure of the valve closing speed control apparatus of this invention. 本発明の弁閉鎖速度制御装置で制御された弁の開度と時間との関係の一例を示す図である。It is a figure which shows an example of the relationship between the opening degree of a valve controlled by the valve closing speed control apparatus of this invention, and time. 本発明の弁閉鎖速度制御装置で制御された弁の開度と時間との関係の他の一例を示す図である。It is a figure which shows another example of the relationship between the opening degree of a valve controlled by the valve closing speed control apparatus of this invention, and time.

本発明の弁閉鎖速度制御装置、および沸騰水型原子力発電プラントの運転方法の実施形態を、図１乃至図５を用いて説明する。   Embodiments of a valve closing speed control apparatus and a boiling water nuclear power plant operating method according to the present invention will be described with reference to FIGS. 1 to 5.

まず、沸騰水型原子力発電プラントの概略について図１を用いて説明する。図１は、沸騰水型原子力発電プラントの概要の一例を示す図である。   First, an outline of a boiling water nuclear power plant will be described with reference to FIG. FIG. 1 is a diagram illustrating an example of an outline of a boiling water nuclear power plant.

図１において、沸騰水型原子力発電プラント７１は、大きくは原子炉建屋７２とタービン建屋７３とから構成されている。   In FIG. 1, a boiling water nuclear power plant 71 is mainly composed of a reactor building 72 and a turbine building 73.

原子炉建屋７２の内部には原子炉圧力容器５が中心部に存在しており、この原子炉圧力容器５は原子炉格納容器７４で覆われている。   The reactor pressure vessel 5 exists in the center of the reactor building 72, and the reactor pressure vessel 5 is covered with a reactor containment vessel 74.

タービン建屋７３の内部にはタービン７が設けられており、このタービン７の回転により発電機８が回転するようになっている。タービン７の下方には復水器７８が設けられている。   A turbine 7 is provided inside the turbine building 73, and the generator 8 is rotated by the rotation of the turbine 7. A condenser 78 is provided below the turbine 7.

原子炉建屋７２の原子炉格納容器７４内の原子炉圧力容器５とタービン建屋７３内のタービン７とは主蒸気配管６とで連結されている。また原子炉圧力容器５と復水器７８とは給復水配管８０で連結されている。復水器７８には海水を循環するために海水循環配管８１が取り付けられており、取水口８１ａから海水が取り込まれて復水器７８を循環した後、散水口８１ｂから海に戻される。   The reactor pressure vessel 5 in the reactor containment vessel 74 of the reactor building 72 and the turbine 7 in the turbine building 73 are connected by the main steam pipe 6. Further, the reactor pressure vessel 5 and the condenser 78 are connected by a feed water condensate pipe 80. A seawater circulation pipe 81 is attached to the condenser 78 to circulate seawater. After the seawater is taken in from the intake port 81a and circulated through the condenser 78, it is returned to the sea from the sprinkler port 81b.

通常運転における沸騰水型原子力発電プラント７１では、原子炉圧力容器５内の核燃料の核分裂によって発生する熱を用いて水を沸騰させ、この沸騰によって蒸気を発生させている。発生させた蒸気は主蒸気配管６を経由してタービン建屋７３内のタービン７へ送られ、タービン７を回転させることによりタービン７に直結した発電機８が回転し、電気が発生する。   In the boiling water nuclear power plant 71 in normal operation, water is boiled using heat generated by nuclear fission of nuclear fuel in the reactor pressure vessel 5, and steam is generated by this boiling. The generated steam is sent to the turbine 7 in the turbine building 73 via the main steam pipe 6, and when the turbine 7 is rotated, the generator 8 directly connected to the turbine 7 is rotated, and electricity is generated.

タービン７の回転に使用した蒸気は復水器７８で冷却されることによって凝縮されて水に戻り、給復水配管８０によって再び原子炉圧力容器5内に戻されて蒸気として使用される。   The steam used for the rotation of the turbine 7 is condensed and returned to water by being cooled by the condenser 78, and is again returned to the reactor pressure vessel 5 by the feed condensate piping 80 and used as steam.

次に、沸騰水型原子力発電プラント７１中における弁閉鎖速度制御装置１について図２乃至図５を用いて説明する。図２は沸騰水型原子力発電システムと弁閉鎖速度制御装置の概略構成図、図３は弁閉鎖速度制御装置の構成を示す図、図４および図５は弁閉鎖速度制御装置で制御された弁の開度と時間との関係を示す図である。   Next, the valve closing speed control device 1 in the boiling water nuclear power plant 71 will be described with reference to FIGS. 2 is a schematic configuration diagram of a boiling water nuclear power generation system and a valve closing speed control device, FIG. 3 is a diagram showing a configuration of the valve closing speed control device, and FIGS. 4 and 5 are valves controlled by the valve closing speed control device. It is a figure which shows the relationship between the opening degree of and the time.

図２に示すように、運転時の沸騰水型原子力発電プラント７１では、原子炉系制御装置１１は主蒸気流量検出器１０から入力される主蒸気流量信号Ｓ６や主蒸気配管圧力検出器１２から入力される主蒸気配管圧力信号Ｓ７等の入力を常に受けており、主蒸気配管６内の蒸気の状態を常に監視している。   As shown in FIG. 2, in the boiling water nuclear power plant 71 during operation, the nuclear reactor system control device 11 receives the main steam flow rate signal S6 input from the main steam flow rate detector 10 and the main steam pipe pressure detector 12. The main steam pipe pressure signal S7 and the like input are always received, and the state of the steam in the main steam pipe 6 is constantly monitored.

このような沸騰水型原子力発電プラント７１では、例えば、主蒸気配管６の破断等によって主蒸気流量信号Ｓ６が異常に上昇した場合や、主蒸気配管圧力信号Ｓ７が異常に低下したと判断されるときは、主蒸気隔離弁閉鎖信号Ｓ８を主蒸気隔離弁９Ａへ出力し、主蒸気配管６上に設けられた主蒸気隔離弁９Ａを緊急で閉鎖する。   In such a boiling water nuclear power plant 71, for example, it is determined that the main steam flow rate signal S6 has abnormally increased due to the main steam pipe 6 being broken or the like, or that the main steam pipe pressure signal S7 has been abnormally decreased. At this time, the main steam isolation valve closing signal S8 is output to the main steam isolation valve 9A, and the main steam isolation valve 9A provided on the main steam pipe 6 is closed urgently.

しかしながら、主蒸気配管6の破断の場合、圧力低下によって原子炉冷却材（通常は軽水）の飽和温度が低下し、原子炉冷却材ボイド率が増加する。このため、従来の技術では主蒸気隔離弁９Ａの閉鎖によって炉心に大きな正の反応度が投入されて原子炉圧力および原子炉出力が大きく上昇し、上述のように燃料破損に至る可能性がある、との課題が生じる可能性がある。   However, when the main steam pipe 6 is broken, the saturation temperature of the reactor coolant (usually light water) decreases due to the pressure drop, and the reactor coolant void ratio increases. For this reason, in the prior art, closing the main steam isolation valve 9A causes a large positive reactivity to be introduced into the reactor core, and the reactor pressure and the reactor power are greatly increased, which may lead to fuel failure as described above. , And there is a possibility that a problem occurs.

そこで、図２に示すように、沸騰水型原子力発電プラント７１に、原子炉系制御装置１１に加えて、主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃの閉鎖による原子炉圧力および原子炉出力の上昇を緩和することを目的として、主蒸気配管６に設けられた主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃの閉鎖速度の制御を行う弁閉鎖速度制御装置１を新たに設ける。   Therefore, as shown in FIG. 2, in addition to the reactor system controller 11, the reactor pressure by closing the main steam isolation valve 9A, the steam control valve 9B, and the main steam stop valve 9C is added to the boiling water nuclear power plant 71. And a valve closing speed control device for controlling the closing speed of the main steam isolation valve 9A, the steam control valve 9B, and the main steam stop valve 9C provided in the main steam pipe 6 for the purpose of mitigating the increase in the reactor power. 1 is newly provided.

この弁閉鎖速度制御装置１は、図３に示すように、原子炉冷却材ボイド率算出部２、弁閉鎖速度算出部３および弁閉鎖速度変更部４から構成される。   As shown in FIG. 3, the valve closing speed control device 1 includes a reactor coolant void ratio calculating unit 2, a valve closing speed calculating unit 3, and a valve closing speed changing unit 4.

図３において、原子炉冷却材ボイド率算出部２は、原子炉内に配置された原子炉出力検出器１４や原子炉再循環流量検出器１３からの原子炉出力信号Ｓ１や原子炉再循環流量信号Ｓ２等を受け、原子炉冷却材内のボイド率Ｓ３を算出する。   In FIG. 3, the reactor coolant void ratio calculation unit 2 includes a reactor output signal S1 and a reactor recirculation flow rate from the reactor output detector 14 and the reactor recirculation flow rate detector 13 disposed in the reactor. In response to the signal S2 and the like, the void ratio S3 in the reactor coolant is calculated.

弁閉鎖速度算出部３は、原子炉冷却材ボイド率算出部２で算出されたボイド率Ｓ３の変化を監視し、ボイド率Ｓ３の変化に応じて主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃの閉鎖速度Ｓ４を演算する。   The valve closing speed calculation unit 3 monitors the change in the void rate S3 calculated by the reactor coolant void rate calculation unit 2, and according to the change in the void rate S3, the main steam isolation valve 9A, the steam control valve 9B, The closing speed S4 of the steam stop valve 9C is calculated.

特に、原子炉冷却材ボイド率算出部２で算出されるボイド率が上昇したと判断されたときは、弁閉鎖速度算出部３にて算出された主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃの閉鎖速度Ｓ４に従い、各弁の閉鎖速度を設定する。   In particular, when it is determined that the void ratio calculated by the reactor coolant void ratio calculation unit 2 has increased, the main steam isolation valve 9A, the steam control valve 9B, According to the closing speed S4 of the steam stop valve 9C, the closing speed of each valve is set.

また、弁閉鎖速度算出部３は、弁の種類に応じた閉鎖速度Ｓ４を演算する。例えば、閉鎖速度を自由に調節できる弁であれば、図４に示すように、全閉になるまでに要する時間が長くなるよう、緩やかな閉鎖速度Ｓ４とする。閉鎖速度を調節できない弁であれば、図５に示すように、閉鎖途中で閉鎖を停止するような閉鎖速度Ｓ４とする。   Moreover, the valve closing speed calculation part 3 calculates the closing speed S4 according to the kind of valve. For example, in the case of a valve that can freely adjust the closing speed, as shown in FIG. 4, it is set to a gradual closing speed S4 so that the time required for full closing becomes longer. If it is a valve which cannot adjust a closing speed, as shown in FIG. 5, it will be set as closing speed S4 which stops closing in the middle of closing.

弁閉鎖速度変更部４は、弁閉鎖速度算出部３で演算された閉鎖速度で主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃが閉鎖されるように、主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃに対して弁閉鎖速度変更指令信号Ｓ５を出力する。   The valve closing speed changing unit 4 is configured so that the main steam isolation valve 9A, the main steam isolation valve 9B, and the main steam stop valve 9C are closed at the closing speed calculated by the valve closing speed calculation unit 3. A valve closing speed change command signal S5 is output to the steam control valve 9B and the main steam stop valve 9C.

次に、本実施形態に係る沸騰水型原子力発電プラント７１の運転方法について説明する。   Next, an operation method of the boiling water nuclear power plant 71 according to the present embodiment will be described.

本実施形態では、沸騰水型原子力発電プラント７１の運転中は、原子炉内に配置された原子炉出力検出器１４や原子炉再循環流量検出器１３からの原子炉出力信号Ｓ１や原子炉再循環流量信号Ｓ２等の入力を受け、原子炉冷却材ボイド率算出部２にて原子炉格納容器７４内の原子炉冷却材内のボイド率Ｓ３を絶えず算出し続ける（ボイド率の検出工程）。   In the present embodiment, during the operation of the boiling water nuclear power plant 71, the reactor output signal S1 from the reactor output detector 14 and the reactor recirculation flow rate detector 13 arranged in the reactor or the reactor reactivation Receiving the circulation flow signal S2 and the like, the reactor coolant void ratio calculation unit 2 continuously calculates the void ratio S3 in the reactor coolant in the reactor containment vessel 74 (void ratio detection step).

また、弁閉鎖速度算出部３は、原子炉冷却材ボイド率算出部２において絶えず算出されるボイド率Ｓ３の変化を監視し続ける。そして、ボイド率Ｓ３の変化、例えば、通常運転範囲から外れる急激な上昇が生じていると判断したときは、主蒸気配管６に設けられた主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃの閉鎖速度を通常より遅くするための閉鎖速度Ｓ４を算出する（閉鎖速度の演算工程）。   Further, the valve closing speed calculation unit 3 continues to monitor the change in the void rate S3 that is constantly calculated by the reactor coolant void rate calculation unit 2. When it is determined that there is a change in the void ratio S3, for example, a sudden rise outside the normal operating range, a main steam isolation valve 9A, a steam control valve 9B, a main steam stop provided in the main steam pipe 6 A closing speed S4 for making the closing speed of the valve 9C slower than usual is calculated (closing speed calculating step).

そして、弁閉鎖速度算出部３で算出された閉鎖速度Ｓ４で弁が閉鎖されるよう、弁閉鎖速度変更指令信号Ｓ５を弁閉鎖速度変更部４から出力し、主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃの閉鎖速度が適切に設定される（閉鎖速度設定工程）。   Then, the valve closing speed change command signal S5 is output from the valve closing speed changing section 4 so that the valve is closed at the closing speed S4 calculated by the valve closing speed calculating section 3, and the main steam isolation valve 9A, the steam control valve is output. 9B, the closing speed of the main steam stop valve 9C is appropriately set (closing speed setting step).

次に、本実施形態の効果について説明する。   Next, the effect of this embodiment will be described.

上述した本発明の沸騰水型原子力発電プラント７１は、沸騰水型原子力発電プラント７１の原子炉圧力容器5とタービン７とを連結する主蒸気配管６に設けられた主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃの閉鎖速度の制御を行う弁閉鎖速度制御装置１を備えており、この弁閉鎖速度制御装置１は、原子炉圧力容器内の原子炉冷却材のボイド率を算出する原子炉冷却材ボイド率算出部２と、算出されたボイド率の変化を監視し、変化に応じて主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃの閉鎖速度を演算し、閉鎖速度Ｓ４を出力する弁閉鎖速度算出部３および弁閉鎖速度変更指令S5を出力する弁閉鎖速度変更部４と、を備えている。   The above-described boiling water nuclear power plant 71 of the present invention includes a main steam isolation valve 9A provided in the main steam pipe 6 that connects the reactor pressure vessel 5 of the boiling water nuclear power plant 71 and the turbine 7, and steam control. A valve closing speed control device 1 that controls the closing speed of the valve 9B and the main steam stop valve 9C is provided. The valve closing speed control device 1 calculates the void ratio of the reactor coolant in the reactor pressure vessel. The reactor coolant void ratio calculation unit 2 that monitors the change in the calculated void ratio, and calculates the closing speed of the main steam isolation valve 9A, the steam control valve 9B, and the main steam stop valve 9C according to the change, A valve closing speed calculating unit 3 that outputs a closing speed S4; and a valve closing speed changing unit 4 that outputs a valve closing speed changing command S5.

このような構成によって、主蒸気配管６上の弁の閉鎖速度が原子炉冷却材内のボイド率に応じた適切な閉鎖速度に設定されるため、原子炉で発生した主蒸気の流れの遮断が緩やかになり、原子炉圧力の上昇とそれに伴って炉心に投入される正の反応度を従来に比べて緩やかにすることができる。従って、原子炉出力の上昇を従来に比べて緩和することができ、燃料破損に至る可能性を従来に比べてより低くすることが可能となるとの効果を奏する。   With such a configuration, the closing speed of the valve on the main steam pipe 6 is set to an appropriate closing speed corresponding to the void ratio in the reactor coolant, so that the flow of the main steam generated in the reactor is blocked. As a result, the reactor pressure increases and the positive reactivity injected into the reactor core can be moderated as compared with the conventional technology. Therefore, the increase in the reactor power can be mitigated compared to the conventional case, and the possibility that the fuel can be damaged can be reduced as compared with the conventional case.

また、弁閉鎖速度算出部３および弁閉鎖速度変更部４は、ボイド率が上昇したと判断されたときは、主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃの閉鎖速度を遅くするため、より確実に原子炉圧力および原子炉出力の上昇を従来に比べて緩やかにすることができる。   Further, when it is determined that the void rate has increased, the valve closing speed calculating unit 3 and the valve closing speed changing unit 4 reduce the closing speed of the main steam isolation valve 9A, the steam control valve 9B, and the main steam stop valve 9C. As a result, the increase in the reactor pressure and the reactor power can be made more gradual than before.

また、弁閉鎖速度算出部３および弁閉鎖速度変更部４は、弁の種類に応じた閉鎖速度を演算することにより、弁に最も適した閉鎖制御が行われるため、より安定かつ確実な緊急時の弁閉鎖制御を実現することができる。   In addition, the valve closing speed calculating unit 3 and the valve closing speed changing unit 4 calculate the closing speed according to the type of the valve, so that the closing control most suitable for the valve is performed. The valve closing control can be realized.

＜その他＞
なお、本発明は上記の実施形態に限られず、種々の変形、応用が可能なものである。上述した実施形態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ない。 <Others>
In addition, this invention is not restricted to said embodiment, A various deformation | transformation and application are possible. The above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to the one having all the configurations described.

例えば、主蒸気配管６に設けられた弁を、主蒸気隔離弁９Ａ，蒸気加減弁９Ｂ，主蒸気止め弁９Ｃとした場合について説明したが、これらのうちいずれか一つ以上であればよく、また主蒸気配管６上に配置された弁であれば、これらの弁以外であってもよい。   For example, although the case where the valves provided in the main steam pipe 6 are the main steam isolation valve 9A, the steam control valve 9B, and the main steam stop valve 9C, any one or more of these may be used, Moreover, as long as it is a valve | bulb arrange | positioned on the main steam piping 6, you may be other than these valves.

１…弁閉鎖速度制御装置
２…原子炉冷却材ボイド率算出部
３…弁閉鎖速度算出部
４…弁閉鎖速度変更部
５…原子炉圧力容器
６…主蒸気配管
７…タービン
８…発電機
９Ａ…主蒸気隔離弁
９Ｂ…蒸気加減弁
９Ｃ…主蒸気止め弁
１０…主蒸気流量検出器
１１…原子炉系制御装置
１２…主蒸気配管圧力検出器
１３…原子炉再循環流量検出器
１４…原子炉出力検出器
Ｓ１…原子炉出力信号
Ｓ２…原子炉再循環流量信号
Ｓ３…原子炉冷却材ボイド率信号
Ｓ４…弁閉鎖速度要求信号
Ｓ５…弁閉鎖速度変更指令信号
Ｓ６…主蒸気流量信号
Ｓ７…主蒸気配管圧力信号 DESCRIPTION OF SYMBOLS 1 ... Valve closing speed control apparatus 2 ... Reactor coolant void ratio calculation part 3 ... Valve closing speed calculation part 4 ... Valve closing speed change part 5 ... Reactor pressure vessel 6 ... Main steam piping 7 ... Turbine 8 ... Generator 9A ... Main steam isolation valve 9B ... Steam control valve 9C ... Main steam stop valve 10 ... Main steam flow detector 11 ... Reactor system controller 12 ... Main steam piping pressure detector 13 ... Reactor recirculation flow detector 14 ... Atom Reactor output detector S1 ... Reactor output signal S2 ... Reactor recirculation flow rate signal S3 ... Reactor coolant void ratio signal S4 ... Valve closing speed request signal S5 ... Valve closing speed change command signal S6 ... Main steam flow signal S7 ... Main steam piping pressure signal

Claims (5)

沸騰水型原子力発電プラントの原子炉とタービンとを連結する主蒸気配管に設けられた弁の閉鎖速度の制御を行う弁閉鎖速度制御装置であって、
前記原子炉内の原子炉冷却材のボイド率の変化を監視し、前記変化に応じて前記弁の閉鎖速度を演算し、演算された閉鎖速度で前記弁が閉鎖されるよう前記弁に閉鎖速度信号を出力する演算部と、を備えた
ことを特徴とする弁閉鎖速度制御装置。 A valve closing speed control device for controlling a closing speed of a valve provided in a main steam pipe connecting a reactor and a turbine of a boiling water nuclear power plant,
The change in the void ratio of the reactor coolant in the reactor is monitored, the valve closing speed is calculated in accordance with the change, and the valve closing speed is closed at the calculated closing speed. A valve closing speed control device comprising: an arithmetic unit that outputs a signal. 請求項１に記載の弁閉鎖速度制御装置において、
前記演算部は、前記ボイド率が上昇したと判断されたときは、前記弁の閉鎖速度を遅くする
ことを特徴とする弁閉鎖速度制御装置。 The valve closing speed control device according to claim 1,
When it is determined that the void ratio has increased, the arithmetic unit slows down the valve closing speed. 請求項１に記載の弁閉鎖速度制御装置において、
前記演算部は、前記弁の種類に応じた閉鎖速度を演算する
ことを特徴とする弁閉鎖速度制御装置。 The valve closing speed control device according to claim 1,
The said calculating part calculates the closing speed according to the kind of said valve. The valve closing speed control apparatus characterized by the above-mentioned. 請求項１に記載の弁閉鎖速度制御装置を備えた
ことを特徴とする沸騰水型原子力発電プラント。 A boiling water nuclear power plant comprising the valve closing speed control device according to claim 1. 原子炉とタービンとを備えた沸騰水型原子力発電プラントの運転方法であって、
前記原子炉内の原子炉冷却材のボイド率の変化を監視し、前記変化に応じて原子炉とタービンとを連接する主蒸気配管に設けられた弁の閉鎖速度を演算する演算工程と、
前記演算工程で演算された閉鎖速度で前記弁が閉鎖されるよう前記弁の閉鎖速度を設定する閉鎖速度設定工程と、を有する
ことを特徴とする沸騰水型原子力発電プラントの運転方法。 A method of operating a boiling water nuclear power plant including a nuclear reactor and a turbine,
A calculation step of monitoring a change in a void ratio of the reactor coolant in the reactor, and calculating a closing speed of a valve provided in a main steam pipe connecting the reactor and the turbine according to the change;
A method for operating the boiling water nuclear power plant, comprising: a closing speed setting step for setting the closing speed of the valve so that the valve is closed at the closing speed calculated in the calculating step.
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