JPS58220906A - Erroneous-closure preventing apparatus for main steam sealing valve in test - Google Patents

Erroneous-closure preventing apparatus for main steam sealing valve in test

Info

Publication number
JPS58220906A
JPS58220906A JP57102223A JP10222382A JPS58220906A JP S58220906 A JPS58220906 A JP S58220906A JP 57102223 A JP57102223 A JP 57102223A JP 10222382 A JP10222382 A JP 10222382A JP S58220906 A JPS58220906 A JP S58220906A
Authority
JP
Japan
Prior art keywords
valve
air
main steam
test
closed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP57102223A
Other languages
Japanese (ja)
Inventor
Hiromi Shimokawa
下川　広実
Katsushige Onodera
小野寺　勝重
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP57102223A priority Critical patent/JPS58220906A/en
Publication of JPS58220906A publication Critical patent/JPS58220906A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/20—Checking operation of shut-down devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Control Of Turbines (AREA)

Abstract

PURPOSE:To prevent erroneous closing of a main steam sealing valve and suppress stop of a nuclear reactor by installing an air tank and a solenoid valve in a test control circuit, in order to immediately prevent discharge of the air for valve operation when an air pilot valve is broken. CONSTITUTION:In test, a switch C1 is turned ON, when switches C2 and C3 are ON. Then, an air metering valve 4 is opened, and the discharged air is stored in an air tank 2. Since the valve is closed by about 10%, at this time and the internal pressure in the air tank 2 becomes equal to the pressure under a piston 12, a main steam sealing valve is not closed by about 10% or more, even if the air metering valve 4 is in trouble. After test is completed, a test controlling air pilot valve 1 is closed, and a solenoid valve 3 is opened to discharge air. In this case, if the main steam sealing valve is closed by about 10% or more further, the solenoid valve 3 is immediately closed, and thus excessively closed state of the main steam sealing valve can be prevented.

Description

【発明の詳細な説明】 本発明は主蒸気隔離弁テストコントロール回路に係り、
特に主蒸気隔離弁の誤閑の防止に好適な装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a main steam isolation valve test control circuit;
In particular, the present invention relates to a device suitable for preventing erroneous opening of a main steam isolation valve.

従来の回路は、テストコントロール用のエアパイロット
バルブにテスト閉速度調整用のエアメタリングバルブが
組み込まれているだけの装置となっていたので、エアパ
イロットバルブが故障（固着？シートリーク）した場合
、主蒸気隔離弁は、そのまま誤閉してしまうというよう
な欠点があった。The conventional circuit was simply an air metering valve for test closing speed adjustment built into the air pilot valve for test control, so if the air pilot valve malfunctioned (stuck or seat leaked) However, the main steam isolation valve had the disadvantage that it could be closed incorrectly.

本発明の目的は主蒸気隔離弁の定期試験による全閉制動
作の防正装ｆｉｌ’！に提供することにある。The purpose of the present invention is to prevent the full-closure braking action by periodic testing of the main steam isolation valve! The aim is to provide the following.

エアパイロットバルブが故障（固着やシートリーク）し
た場合、バルブ作動用空気の排出をできる限り早い時点
で防止することが本発明の基本釣力えである。If the air pilot valve malfunctions (sticking or seat leak), the basic purpose of the present invention is to prevent the valve operating air from being discharged as soon as possible.

以下、本発明の一実施例を第１図および第２図により説
明する。An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

第１図は、本発明に係るもので、第２図のテストコント
ロール用エアパイロットハルフ１４）排気管側のエアメ
タリングバルブ４の後方に本発明である空気タンク２と
電磁弁３を設けたものである。FIG. 1 shows the air tank 2 and electromagnetic valve 3 according to the present invention, which are installed behind the air metering valve 4 on the exhaust pipe side of the test control air pilot half shown in FIG. It is something.

第２図は、従来の主蒸気隔離弁の制御回路図であり、主
蒸気隔離弁の弁開状態を示す。スイッチＣ２＋　Ｃ８を
オンすることにより操作用空気はアクチュエータ５の一
部であるピストン１２を押し上げ、弁は開状態になる。FIG. 2 is a control circuit diagram of a conventional main steam isolation valve, showing an open state of the main steam isolation valve. By turning on the switches C2+C8, the operating air pushes up the piston 12, which is a part of the actuator 5, and the valve becomes open.

その際、空気はメインコントロール用エアパイロットバ
ルブ７の排気管から排出される。At this time, air is discharged from the exhaust pipe of the main control air pilot valve 7.

主蒸気隔離弁１０％閉テスト前は、エアメタリングバル
ブ４と電磁弁３は閉じている。Before the main steam isolation valve 10% closure test, the air metering valve 4 and the solenoid valve 3 are closed.

テスト時は、スイッチＣ６，Ｃ３の両方のスイッチが入
った状態でスイッチＣ３を入れる。その時エアメタリン
グバルブ４が開となり空気タンク内に排出空気を貯める
。この時点でバルブは１０チ閉となる。During testing, switch C3 is turned on with both switches C6 and C3 turned on. At that time, the air metering valve 4 is opened and the discharged air is stored in the air tank. At this point, the valve is closed by 10 inches.

この時、空気タンク２内圧力とピストン１２下部の圧力
とが同一となっているので、もしエアメタリングバルブ
４が故障（固着やシートリーク）しても主蒸気隔離弁は
１０チ閉以上は閉とならない。At this time, the pressure inside the air tank 2 and the pressure at the bottom of the piston 12 are the same, so even if the air metering valve 4 malfunctions (sticking or seat leak), the main steam isolation valve will not close more than 10 times. It won't close.

テスト終了時、テストコントロール用エアパイロットバ
ルブ１を閉とした後、電磁弁３を開き空　気を排出する
が、主蒸気隔離弁が更に１０チ閉以上に閉となる場合は
直ちに′電磁弁３を閉とすることにより異常に主蒸気隔
離弁が閉となることを防ｌトできる。　　　　　　　　
″：′ 本実本実施工れば、エアメタリングパルプ４の異常（固
着やシートリーク）時の空気の排出は阻止され、主蒸気
隔離弁の誤閉防止の効果がある。At the end of the test, after closing the test control air pilot valve 1, the solenoid valve 3 is opened to exhaust the air. However, if the main steam isolation valve closes further by 10 degrees or more, the solenoid valve 3 is immediately closed. By closing the main steam isolation valve, it is possible to prevent the main steam isolation valve from abnormally closing.
″:′ This actual implementation prevents air from being discharged in the event of an abnormality (sticking or sheet leak) in the air metering pulp 4, and has the effect of preventing erroneous closing of the main steam isolation valve.

本発明によれば、エアパイロットバルブの故障（固着や
シートリーク）による主蒸気隔離弁の誤閉が防止できる
ので、主蒸気隔離弁が閉止することによる原子炉停止が
阻止され、プラント稼動率の向上の効果がある。According to the present invention, it is possible to prevent the main steam isolation valve from being erroneously closed due to air pilot valve failure (sticking or seat leakage), thereby preventing reactor shutdown due to the closure of the main steam isolation valve, and improving plant operation rate. It has an improving effect.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はテストコントロール用エアパイロットバルブ前
後の回路図、第２図は主蒸気隔離弁コントロール系回路
図（弁開状態を示す）である。Figure 1 is a circuit diagram before and after the air pilot valve for test control, and Figure 2 is a circuit diagram of the main steam isolation valve control system (showing the valve open state).

Claims (1)

【特許請求の範囲】[Claims] １、主蒸気隔離弁の制御に使用される３方切り換え電磁
弁と３方エアパイロツトバルブおよびエアメタリングバ
ルブより成るテストコントロール回路においで空気タン
クおよび′電磁弁を設けたことを特徴とする主蒸気隔離
弁の誤閉防止装置。1. A test control circuit consisting of a three-way switching solenoid valve, a three-way air pilot valve, and an air metering valve used to control the main steam isolation valve, which is equipped with an air tank and a solenoid valve. Accidental closure prevention device for steam isolation valves.
JP57102223A 1982-06-16 1982-06-16 Erroneous-closure preventing apparatus for main steam sealing valve in test Pending JPS58220906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57102223A JPS58220906A (en) 1982-06-16 1982-06-16 Erroneous-closure preventing apparatus for main steam sealing valve in test

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57102223A JPS58220906A (en) 1982-06-16 1982-06-16 Erroneous-closure preventing apparatus for main steam sealing valve in test

Publications (1)

Publication Number Publication Date
JPS58220906A true JPS58220906A (en) 1983-12-22

Family

ID=14321659

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57102223A Pending JPS58220906A (en) 1982-06-16 1982-06-16 Erroneous-closure preventing apparatus for main steam sealing valve in test

Country Status (1)

Country Link
JP (1) JPS58220906A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6159078A (en) * 1984-07-20 1986-03-26 ベ−・ベ−・ツエ−・アクチエンゲゼルシヤフト・ブラウン・ボヴエリ・ウント・コンパニイ Device for monitoring physical magnitude in device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6159078A (en) * 1984-07-20 1986-03-26 ベ−・ベ−・ツエ−・アクチエンゲゼルシヤフト・ブラウン・ボヴエリ・ウント・コンパニイ Device for monitoring physical magnitude in device

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