JP2012098136A - Monitoring method of safety valve in nuclear power plant - Google Patents

Monitoring method of safety valve in nuclear power plant Download PDF

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JP2012098136A
JP2012098136A JP2010245747A JP2010245747A JP2012098136A JP 2012098136 A JP2012098136 A JP 2012098136A JP 2010245747 A JP2010245747 A JP 2010245747A JP 2010245747 A JP2010245747 A JP 2010245747A JP 2012098136 A JP2012098136 A JP 2012098136A
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safety valve
sensor output
power plant
nuclear power
low
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Akira Kubota
亮 久保田
Kenji Onodera
賢司 小野寺
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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 check whether a flow (leakage), if existing, at downstream side of a safety valve is due to action of the safety valve caused by pressure increase in the system pressure or due to forcible external force caused by thermal expansion or the like, in the safety valve provide in a nuclear power plant or the like.SOLUTION: An action of the safety valve, presence/absence of sheet leakage, sensor abnormality, and the like, which cannot be checked from the appearance are checked by means of a temperature sensor and a pressure sensor for detecting a fluid state in the piping and a displacement sensor for detecting a displacement of a valve rod.

Description

この発明は、原子力発電プラントの安全弁の運転状態監視方法に関する。   The present invention relates to a method for monitoring an operating state of a safety valve of a nuclear power plant.

従来、原子力発電プラントなどに設置されている安全弁においては、通常圧力容器等に接続された配管系統の内圧が上昇した場合に圧力容器等の破損を防ぐために作動するよう設計されている。しかし、安全弁下流側に流体の流れ（漏洩）が認められた場合、系統圧力上昇に伴う正常な安全弁の作動か、または、熱膨張等の強制的外力による安全弁の変形に起因する弁異常かが判断できない場合があり、安全弁の運転状態を判断し異常原因を特定することが困難になっている。   Conventionally, a safety valve installed in a nuclear power plant or the like is usually designed to operate in order to prevent damage to the pressure vessel or the like when the internal pressure of a piping system connected to the pressure vessel or the like rises. However, if fluid flow (leakage) is recognized on the downstream side of the safety valve, it may be normal operation of the safety valve due to system pressure rise or valve abnormality due to deformation of the safety valve due to forced external force such as thermal expansion. In some cases, it cannot be determined, and it is difficult to determine the operating state of the safety valve and identify the cause of the abnormality.

これに対し、特許文献１に記載された技術では、配管内部の流体の状態（温度）を検知するセンサと、全圧検出配管及び静圧検出配管により流量を検出し、弁の開閉状態を正確に判断可能な信号処理装置をそなえた安全弁監視装置が開示されている。また、特許文献２には、安全弁に取り付けた加速度センサと圧力容器の圧力により安全弁の開閉状態および異常正常を判断する、逃がし安全弁の動作状態監視装置が開示されている。   On the other hand, in the technique described in Patent Document 1, the flow rate is detected by a sensor that detects the state (temperature) of the fluid inside the pipe, the total pressure detection pipe and the static pressure detection pipe, and the open / close state of the valve is accurately determined. A safety valve monitoring device including a signal processing device that can be determined is disclosed. Further, Patent Document 2 discloses an operating state monitoring device for a relief safety valve that determines whether the safety valve is open or closed and abnormally normal based on an acceleration sensor attached to the safety valve and the pressure of the pressure vessel.

特開昭５６−１２４７８２号公報JP-A-56-124782 特開平２−４５０６９号公報JP-A-2-45069

上記の特許文献１および特許文献２では、基本的な安全弁の運転状態の正常、異常を判断することができる。しかしながら、弁の変位センサと温度センサと圧力センサを組み合わせてより正確に安全弁の作動状態を検出し、さらにセンサ自体の正常／異常を判別する構成については開示されていない。   In Patent Literature 1 and Patent Literature 2 described above, whether the basic operating state of the safety valve is normal or abnormal can be determined. However, there is no disclosure of a configuration for more accurately detecting the operating state of the safety valve by combining a valve displacement sensor, a temperature sensor, and a pressure sensor, and further determining normality / abnormality of the sensor itself.

本発明は、原子力発電プラントの系統運転中に安全弁が作動したか否か、及び安全弁の正確な作動状態か否かを確認する事が可能な安全弁の運転状態監視方法を提供することを目的とする。   It is an object of the present invention to provide a safety valve operating state monitoring method capable of confirming whether or not a safety valve has been activated during system operation of a nuclear power plant and whether or not the safety valve is in an accurate operating state. To do.

本発明は、入口側配管と出口側配管の間に設けられ前記入口側配管圧力が設定値を超えると開放され流入口と流出口を連通させる弁体と、該弁体の上部に設けられた弁棒とを有する安全弁であって、前記弁棒の昇降を感知する変位センサと、前記出口側配管内部の流体温度を検知する温度センサと、前記入口側配管圧力を検出する圧力センサと、前記各センサからのデータを受信して前記安全弁の開閉を制御する制御装置を有する原子力発電プラントの安全弁監視制御方法において、前記変位センサと温度センサと圧力センサの出力の組合せにより前記安全弁の作動状態および前記変位センサと温度センサと圧力センサの異常を判断する事を特徴とする。   The present invention is provided between an inlet-side pipe and an outlet-side pipe, and is provided on the upper part of the valve body that is opened when the inlet-side pipe pressure exceeds a set value and communicates the inlet and the outlet. A safety valve having a valve stem, a displacement sensor that senses raising and lowering of the valve stem, a temperature sensor that detects a fluid temperature inside the outlet side pipe, a pressure sensor that detects the inlet side pipe pressure, In a safety valve monitoring and control method for a nuclear power plant having a control device that receives data from each sensor and controls the opening and closing of the safety valve, an operating state of the safety valve is determined by a combination of outputs of the displacement sensor, temperature sensor, and pressure sensor, and An abnormality of the displacement sensor, the temperature sensor, and the pressure sensor is determined.

また、原子力発電プラントの安全弁監視制御方法において、前記温度センサ出力が高且つ変位センサ出力が無且つ圧力センサ出力が高の場合、または前記温度センサ出力が高且つ変位センサ出力が無且つ圧力センサ出力が低の場合に前記安全弁がシートリーク状態にあると判断することを特徴とする。   Further, in the safety valve monitoring control method for a nuclear power plant, when the temperature sensor output is high and the displacement sensor output is not high and the pressure sensor output is high, or the temperature sensor output is high and the displacement sensor output is not high and the pressure sensor output is high It is determined that the safety valve is in a seat leak state when the pressure is low.

また、原子力発電プラントの安全弁監視制御方法において、前記温度センサ出力が低且つ変位センサ出力が有且つ圧力センサ出力が高の場合、または前記温度センサ出力が低且つ変位センサ出力が無且つ圧力センサ出力が高の場合に前記温度センサが異常状態にあると判断することを特徴とする。   Further, in the safety valve monitoring control method for a nuclear power plant, when the temperature sensor output is low and the displacement sensor output is high and the pressure sensor output is high, or the temperature sensor output is low and the displacement sensor output is low and the pressure sensor output is low When the temperature is high, it is determined that the temperature sensor is in an abnormal state.

また、原子力発電プラントの安全弁監視制御方法において、前記温度センサ出力が高且つ変位センサ出力が有且つ圧力センサ出力が低の場合、または前記温度センサ出力が低且つ変位センサ出力が有且つ圧力センサ出力が低の場合に前記安全弁が閉じない異常状態にあると判断することを特徴とする。   In the safety valve monitoring control method for a nuclear power plant, when the temperature sensor output is high and the displacement sensor output is high and the pressure sensor output is low, or the temperature sensor output is low and the displacement sensor output is low and the pressure sensor output is low Is low, it is determined that the safety valve is in an abnormal state where it does not close.

また、原子力発電プラントの安全弁監視制御方法において、前記温度センサ出力が高且つ変位センサ出力が有且つ圧力センサ出力が高の場合に前記安全弁が正常な開放状態にあり、または前記温度センサ出力が低且つ変位センサ出力が無且つ圧力センサ出力が低の場合に前記安全弁が正常な閉鎖状態にあると判断することを特徴とする。   Further, in the safety valve monitoring control method for a nuclear power plant, when the temperature sensor output is high, the displacement sensor output is high, and the pressure sensor output is high, the safety valve is in a normal open state, or the temperature sensor output is low. When the displacement sensor output is not present and the pressure sensor output is low, it is determined that the safety valve is in a normal closed state.

本発明によれば、原子力発電プラントにおいて、入口側配管と出口側配管の間に設けられる弁体と弁棒とを有する安全弁であって、前記弁棒の昇降を感知する変位センサと、前記出口側配管温度を検知する温度センサと、入口側配管圧力を検出する圧力センサとを有し、変位センサと温度センサと圧力センサの出力の組合せにより安全弁の作動状態および前記変位センサと温度センサと圧力センサの異常を判断する安全弁の作動の有無、及びシートリーク等の安全弁異常状態、及び各種センサの異常状態を時系列的に正確に判断することができる。   According to the present invention, in a nuclear power plant, a safety valve having a valve body and a valve stem provided between an inlet-side pipe and an outlet-side pipe, the displacement sensor for sensing the elevation of the valve stem, and the outlet A temperature sensor for detecting the side pipe temperature and a pressure sensor for detecting the inlet side pipe pressure. The operating state of the safety valve and the displacement sensor, the temperature sensor, and the pressure are determined by the combination of the displacement sensor, the temperature sensor, and the output of the pressure sensor. It is possible to accurately determine in time series whether or not a safety valve that determines a sensor abnormality is operating, a safety valve abnormality state such as a seat leak, and abnormal states of various sensors.

本発明の安全弁の作動状態を検出する装置の配置図Arrangement of the device for detecting the operating state of the safety valve of the present invention 本発明の安全弁の作動状態を判断する手順を示すフローチャートThe flowchart which shows the procedure which judges the operating state of the safety valve of this invention 本発明の温度センサと圧カセンサと変位センサによって安全弁の作動状態を判断する手順を示すフローチャートThe flowchart which shows the procedure which judges the operating state of a safety valve by the temperature sensor of this invention, a pressure sensor, and a displacement sensor

〔装置構成〕
具体的には、本発明は以下のものを提供する。図１は、実施形態の構成を示す配置図である。なお以降の説明では、同じ部材の場合には同じ符号を付すとともに、すでに説明した部材の説明は省略する。 〔Device configuration〕
Specifically, the present invention provides the following. FIG. 1 is a layout diagram showing the configuration of the embodiment. In the following description, the same reference numerals are given to the same members, and the description of the members already described is omitted.

図１に示す安全弁１は弁体６を有する。弁体６は入口側配管９内の圧力が設定圧を超えると矢印方向に上昇して開状態になり、流入口１２と流出口１３とを連通させるようになっている。   The safety valve 1 shown in FIG. When the pressure in the inlet side pipe 9 exceeds the set pressure, the valve body 6 rises in the direction of the arrow and opens, and the inlet 12 and the outlet 13 are communicated.

原子炉圧力容器に接続された入口側配管９に設けられたテストライン１１に圧カセンサ４を接続し、ケーブル１０を介して制御装置５に入口側の圧力を伝達する。制御装置５は例えば情報端末から構成し、中央の制御装置に各種情報を送信するものであってもよい。また、安全弁１は弁体６に連結された弁棒７を有し、弁体６が開状態にあるか閉状態にあるかを変位センサ３に伝達する。変位センサ６は非接触型センサを用い、弁棒７の変位を検出する。   The pressure sensor 4 is connected to a test line 11 provided in the inlet side pipe 9 connected to the reactor pressure vessel, and the pressure on the inlet side is transmitted to the control device 5 via the cable 10. The control device 5 may be constituted by an information terminal, for example, and may transmit various information to a central control device. The safety valve 1 has a valve rod 7 connected to the valve body 6, and transmits to the displacement sensor 3 whether the valve body 6 is in an open state or a closed state. The displacement sensor 6 uses a non-contact type sensor and detects the displacement of the valve stem 7.

そして、安全弁１は弁蓋１５の上部に、変位センサ３を取付け可能な矩形の切り欠き部１４を持ち、変位センサ３は切り欠き部１４に取付けられており、ケーブル１０を介して制御装置５に弁体の変位を伝達する。   The safety valve 1 has a rectangular notch 14 to which the displacement sensor 3 can be attached at the top of the valve lid 15, and the displacement sensor 3 is attached to the notch 14. The displacement of the valve element is transmitted to

また、出口側配管８に熱電対からなる温度センサ２が取付けられており、これもケーブル１０を介して制御装置５に出口側配管８を流れる流体の温度を伝達する。   A temperature sensor 2 made of a thermocouple is attached to the outlet side pipe 8, and this also transmits the temperature of the fluid flowing through the outlet side pipe 8 to the control device 5 via the cable 10.

制御装置５は、温度センサ２、変位センサ３、圧カセンサ４の各状態より、安全弁１の状態を検出し時系列的に記録し、このデータに基づいた安全弁1およびセンサの作動状態を判断監視する。
〔安全弁動作状態を判断する手順〕
図２に、温度センサ２、変位センサ３の状態から安全弁１の状態を検出する手順を示す。はじめに、通常は安全弁１は閉状態にあるとし、変位センサ３の全閉状態の位置及び、温度センサ２の検知温度の情報を制御装置に登録する。 The control device 5 detects the state of the safety valve 1 from each state of the temperature sensor 2, the displacement sensor 3 and the pressure sensor 4 and records it in time series, and judges and monitors the operating state of the safety valve 1 and the sensor based on this data. To do.
[Procedure for determining safety valve operating status]
FIG. 2 shows a procedure for detecting the state of the safety valve 1 from the state of the temperature sensor 2 and the displacement sensor 3. First, normally, it is assumed that the safety valve 1 is in a closed state, and information on the position of the displacement sensor 3 in the fully closed state and the temperature detected by the temperature sensor 2 is registered in the control device.

次に、手順１６にて、出口側配管８を流れる流体の温度を検出しその測定データを制御装置５に送信する。次に手順１６の取得データと、制御装置５に設定してある温度センサの規準温度である高温基準温度（配管内部流体温度）および低温基準温度（外部温度）を比較し、取得データが規準温度よりも時系列的に変化していない場合には手順２０により安全弁１は閉状態にあると判断する。   Next, in step 16, the temperature of the fluid flowing through the outlet side pipe 8 is detected and the measurement data is transmitted to the control device 5. Next, the acquired data in step 16 is compared with the high temperature reference temperature (fluid internal fluid temperature) and the low temperature reference temperature (external temperature), which are reference temperatures of the temperature sensor set in the control device 5, and the acquired data is the reference temperature. In the case where the time has not changed in time series, it is determined by the procedure 20 that the safety valve 1 is in the closed state.

取得データが規準温度から時系列的に変化している場合、さらに手順１７において変位センサ３から変位の情報を取得し、変位が全閉状態からの変位を示した場合には手順１８により安全弁１が開状態と判断する。しかし、変位が時系列的に閉状態を示した場合には、手順１９により安全弁１にシートリークが発生していると判断する。
〔安全弁動作状態を判断する別の手順〕
図３に、温度センサ２、変位センサ３、圧カセンサ４の状態より、安全弁１の状態を検出する手順を示す。はじめに、通常は安全弁１は閉状態にあるとし、変位センサ３の全閉状態の位置及び、圧カセンサ４の吹出圧力、温度センサ２の検知温度の情報を制御装置に登録する。 When the acquired data changes in time series from the reference temperature, further, displacement information is acquired from the displacement sensor 3 in step 17, and when the displacement indicates a displacement from the fully closed state, the safety valve 1 is Is determined to be open. However, if the displacement indicates a closed state in time series, it is determined in step 19 that a seat leak has occurred in the safety valve 1.
[Another procedure for judging the operating state of safety valve]
FIG. 3 shows a procedure for detecting the state of the safety valve 1 from the state of the temperature sensor 2, the displacement sensor 3, and the pressure sensor 4. First, normally, the safety valve 1 is assumed to be in a closed state, and information on the position of the displacement sensor 3 in the fully closed state, the discharge pressure of the pressure sensor 4 and the detected temperature of the temperature sensor 2 is registered in the control device.

次に、手順２１で出口側配管８を流れる流体の温度を検知してその測定データを制御装置５に送信する。次に手順１６の取得データと、制御装置５に設定してある温度センサ２の高温基準温度（配管内部流体温度）および低温基準温度（外部温度）を比較し、取得データが規準温度よりも低い場合、手順２６により安全弁１は閉状態にあると判断する。   Next, in step 21, the temperature of the fluid flowing through the outlet side pipe 8 is detected, and the measurement data is transmitted to the control device 5. Next, the acquired data in step 16 is compared with the high temperature reference temperature (fluid internal fluid temperature) and low temperature reference temperature (external temperature) of the temperature sensor 2 set in the control device 5, and the acquired data is lower than the reference temperature. In this case, it is determined by the procedure 26 that the safety valve 1 is in the closed state.

表1に温度センサ２、変位センサ３、圧カセンサ４の状態信号の概略を示す。   Table 1 outlines the status signals of the temperature sensor 2, the displacement sensor 3, and the pressure sensor 4.

Figure 2012098136
Figure 2012098136

取得データが規準温度よりも高い場合、手順２２において圧カセンサ４から入口側配管９の流体圧力を測定し、測定データが安全弁1の吹出圧力よりも低い場合には、手順２５より安全弁１にシートリークが発生していると判断する。次に圧カセンサ４の測定データが吹出圧力よりも高い場合には、変位センサ３から変位情報を取得し変位が開状態を示した場合、手順２４により安全弁１が開状態であると判断する。しかし、変位が閉状態を示した場合には手順２５により安全弁１にシートリークが発生していると判断する。   If the acquired data is higher than the reference temperature, the fluid pressure in the inlet side pipe 9 is measured from the pressure sensor 4 in step 22, and if the measured data is lower than the discharge pressure of the safety valve 1, the seat is placed on the safety valve 1 from step 25. It is determined that a leak has occurred. Next, when the measurement data of the pressure sensor 4 is higher than the blowing pressure, when the displacement information is acquired from the displacement sensor 3 and the displacement indicates the open state, it is determined by the procedure 24 that the safety valve 1 is in the open state. However, if the displacement indicates a closed state, it is determined in step 25 that a seat leak has occurred in the safety valve 1.

また、温度センサ２、変位センサ３の状態から安全弁１の状態を検出する手順の場合も、温度センサ２、変位センサ３、圧カセンサ４の状態から安全弁１の状態を検出する手順の場合も、温度センサ２の取得データが規準温度よりも低く変位センサ３が開状態を示している場合には、弁体の噛みこみ等の異常な状態であると判断する。   Also, in the case of the procedure for detecting the state of the safety valve 1 from the state of the temperature sensor 2 and the displacement sensor 3, the case of the procedure for detecting the state of the safety valve 1 from the state of the temperature sensor 2, the displacement sensor 3 and the pressure sensor 4 When the acquired data of the temperature sensor 2 is lower than the reference temperature and the displacement sensor 3 indicates the open state, it is determined that the valve body is in an abnormal state such as biting.

これらの判断条件を表２にまとめる。   These determination conditions are summarized in Table 2.

Figure 2012098136
Figure 2012098136

以上の実施形態により、従来、外観上では判断の付かなかった、安全弁の正常作動及びシートリーク、センサ異常等の判断が可能となる。   According to the above embodiment, it is possible to determine normal operation of the safety valve, seat leak, sensor abnormality, etc., which have not been conventionally determined on the appearance.

１：安全弁
２：温度センサ
３：変位センサ
４：圧カセンサ
５：制御装置
６：弁体
７：弁棒
８：出口側配管
９：入口側配管
１０：ケーブル
１１：テストライン
１２：流入口
１３：流出口
１４：切り欠き部
１５：弁蓋 1: Safety valve 2: Temperature sensor
3: Displacement sensor
4: Pressure sensor
5: Control device
6: Valve body 7: Valve stem
8: Outlet piping
9: Inlet side piping
10: Cable
11: Test line 12: Inlet 13: Outlet
14: Notch
15: Valve lid

Claims (5)

入口側配管と出口側配管の間に設けられ前記入口配管圧力が設定値を超えると開放され流入口と流出口を連通させる弁体と、該弁体の上部に設けられた弁棒とを有する安全弁であって、前記弁棒の昇降を感知する変位センサと、前記出口側配管内部の流体温度を検知する温度センサと、前記入口側配管圧力を検出する圧力センサと、前記各センサからのデータを受信して前記安全弁の開閉を制御する制御装置を有する原子力発電プラントの安全弁監視制御方法において、
前記変位センサと温度センサと圧力センサの出力の組合せにより前記安全弁の作動状態および前記変位センサと温度センサと圧力センサの異常を判断する事を特徴とする原子力発電プラントの安全弁監視制御方法。 A valve body that is provided between the inlet side pipe and the outlet side pipe and is opened when the inlet pipe pressure exceeds a set value; and a valve rod provided at an upper portion of the valve body. A displacement sensor that senses the rise and fall of the valve stem, a temperature sensor that detects a fluid temperature inside the outlet-side pipe, a pressure sensor that detects the inlet-side pipe pressure, and data from each sensor In a safety valve monitoring and control method for a nuclear power plant having a control device for controlling the opening and closing of the safety valve by receiving
A safety valve monitoring and control method for a nuclear power plant, wherein an operating state of the safety valve and an abnormality of the displacement sensor, temperature sensor, and pressure sensor are determined by a combination of outputs of the displacement sensor, temperature sensor, and pressure sensor. 請求項１に記載された原子力発電プラントの安全弁監視制御方法において、前記温度センサ出力が高且つ変位センサ出力が無且つ圧力センサ出力が高の場合、または前記温度センサ出力が高且つ変位センサ出力が無且つ圧力センサ出力が低の場合に、前記安全弁がシートリーク状態にあると判断することを特徴とする原子力発電プラントの安全弁監視制御方法。   The safety valve monitoring control method for a nuclear power plant according to claim 1, wherein the temperature sensor output is high and the displacement sensor output is not high and the pressure sensor output is high, or the temperature sensor output is high and the displacement sensor output is high. A safety valve monitoring and control method for a nuclear power plant, wherein the safety valve is determined to be in a seat leak state when the pressure sensor output is low and the pressure sensor output is low. 請求項１に記載された原子力発電プラントの安全弁監視制御方法において、前記温度センサ出力が低且つ変位センサ出力が有且つ圧力センサ出力が高の場合、または前記温度センサ出力が低且つ変位センサ出力が無且つ圧力センサ出力が高の場合に、前記温度センサが異常状態にあると判断することを特徴とする原子力発電プラントの安全弁監視制御方法。   The safety valve monitoring and control method for a nuclear power plant according to claim 1, wherein the temperature sensor output is low and the displacement sensor output is high and the pressure sensor output is high, or the temperature sensor output is low and the displacement sensor output is low. A method for monitoring and controlling a safety valve in a nuclear power plant, wherein the temperature sensor is determined to be in an abnormal state when there is no pressure sensor output and the output is high. 請求項１に記載された原子力発電プラントの安全弁監視制御方法において、前記温度センサ出力が高且つ変位センサ出力が有且つ圧力センサ出力が低の場合、または前記温度センサ出力が低且つ変位センサ出力が有且つ圧力センサ出力が低の場合に、前記安全弁が閉じない異常状態にあると判断することを特徴とする原子力発電プラントの安全弁監視制御方法。   The safety valve monitoring control method for a nuclear power plant according to claim 1, wherein the temperature sensor output is high and the displacement sensor output is high and the pressure sensor output is low, or the temperature sensor output is low and the displacement sensor output is low. A safety valve monitoring and control method for a nuclear power plant, characterized in that when the pressure sensor output is low and the pressure sensor output is low, it is determined that the safety valve is in an abnormal state that does not close. 請求項１に記載された原子力発電プラントの安全弁監視制御方法において、前記温度センサ出力が高且つ変位センサ出力が有且つ圧力センサ出力が高の場合に前記安全弁が正常な開放状態にあり、または前記温度センサ出力が低且つ変位センサ出力が無且つ圧力センサ出力が低の場合に前記安全弁が正常な閉鎖状態にあると判断することを特徴とする原子力発電プラントの安全弁監視制御方法。   The safety valve monitoring and control method for a nuclear power plant according to claim 1, wherein the safety valve is in a normally open state when the temperature sensor output is high, the displacement sensor output is high, and the pressure sensor output is high, or A safety valve monitoring and control method for a nuclear power plant, wherein when the temperature sensor output is low, the displacement sensor output is not present, and the pressure sensor output is low, it is determined that the safety valve is in a normal closed state.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107605823A (en) * 2017-08-24 2018-01-19 哈电集团哈尔滨电站阀门有限公司 A kind of spring safety valve debugging apparatus
CN111177981A (en) * 2019-12-17 2020-05-19 福建福清核电有限公司 Nuclear power plant safety valve checking optimization method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107605823A (en) * 2017-08-24 2018-01-19 哈电集团哈尔滨电站阀门有限公司 A kind of spring safety valve debugging apparatus
CN111177981A (en) * 2019-12-17 2020-05-19 福建福清核电有限公司 Nuclear power plant safety valve checking optimization method

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