JPH0355120Y2 - - Google Patents
Info
- Publication number
- JPH0355120Y2 JPH0355120Y2 JP1984011736U JP1173684U JPH0355120Y2 JP H0355120 Y2 JPH0355120 Y2 JP H0355120Y2 JP 1984011736 U JP1984011736 U JP 1984011736U JP 1173684 U JP1173684 U JP 1173684U JP H0355120 Y2 JPH0355120 Y2 JP H0355120Y2
- Authority
- JP
- Japan
- Prior art keywords
- reactor
- bypass
- protection system
- contact
- alarm
- 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.)
- Expired
Links
- 230000005856 abnormality Effects 0.000 claims description 8
- 230000005284 excitation Effects 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【考案の詳細な説明】
〔考案の技術分野〕
本考案は原子炉保護系のロジツクをバイパスす
るバイパス回路に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a bypass circuit that bypasses the logic of a nuclear reactor protection system.
原子力発電所においては原子炉に異常が生じた
ときにこの異常を検出して原子炉を緊急停止させ
る原子炉保護系が設けられる。この原子炉保護系
は、原子炉の異常を検出する種々のセンサおよび
ロジツク回路から構成され、センサによつて異常
が検出されたときにはスクラム信号を発生して制
御棒を水圧等で緊急挿入することにより原子炉を
自動的に停止させる。したがつて、原子炉保護系
は非常に重要であつて、原子炉運転中は常に動作
状態になければならない。
A nuclear power plant is equipped with a reactor protection system that detects when an abnormality occurs in the reactor and causes an emergency shutdown of the reactor. This reactor protection system consists of various sensors and logic circuits that detect abnormalities in the reactor. When an abnormality is detected by a sensor, a scram signal is generated and control rods are urgently inserted using hydraulic pressure. automatically shuts down the reactor. Therefore, the reactor protection system is very important and must be in operation at all times during reactor operation.
しかしながら、このように原子炉保護系を常に
動作状態に置くことは、原子炉停止中に上記セン
サの校正および保守等を行う場合、誤つてスクラ
ム信号が発生する可能性を生ずる。このスクラム
信号が発生した場合にはすでに全挿入されている
制御棒に、更に緊急挿入を行うための高圧が加え
られることになり、制御棒駆動装置の変形や過大
な応力による寿命の短縮化を招くことになる。
However, if the reactor protection system is always in operation in this way, there is a possibility that a scram signal will be generated erroneously when the sensor is calibrated, maintained, etc. while the reactor is shut down. When this scram signal occurs, high pressure is applied to the control rods that have already been fully inserted to perform emergency insertion, which prevents deformation of the control rod drive device and shortening of its life due to excessive stress. I will invite you.
このような事態を防止するために、原子炉保護
系のロジツク回路にバイパス回路を設け、センサ
の校正および保守中にスクラム信号が発生しない
ようにすることも可能であるが、バイパス回路の
スイツチを原子炉運転中に投入したり、原子炉停
止状態で投入したバイパススイツチの復帰忘れに
より原子炉保護系が動作しないまま原子炉の運転
が再開されるような事故が発生することがある。 To prevent this situation, it is possible to install a bypass circuit in the logic circuit of the reactor protection system to prevent scram signals from occurring during sensor calibration and maintenance. Failure to reset a bypass switch that was turned on during reactor operation or when the reactor was stopped may cause an accident in which the reactor operation is restarted without the reactor protection system operating.
〔考案の目的〕
本考案はこのような従来技術の問題点に鑑みて
なされたもので、センサの校正保守等に際してス
クラム信号の誤発生を防止し、また原子炉保護系
が動作しないまま原子炉が運転されることを防止
できる原子炉保護系のバイパス回路を提供するこ
とを目的とする。[Purpose of the invention] The present invention was developed in view of the problems of the conventional technology, and is intended to prevent the erroneous generation of scram signals during sensor calibration and maintenance, and to prevent the occurrence of erroneous scram signals when the reactor protection system is not operating. The purpose is to provide a bypass circuit for the reactor protection system that can prevent the reactor from being operated.
上記目的達成のため、本考案においては、その
投入によりバイパスを可能にすると共に警報器を
作動させるバイパススイツチと、原子炉が所定の
安全条件を満足しているときにのみ閉成されるイ
ンタロツク接点と、上記バイパススイツチの投入
により警報を発しつつ付勢される限時接点とを直
列接続するようにしており、原子炉運転中のバイ
パスやバイパススイツチの復帰忘れを有効に防止
しながら必要に応じて原子炉保護系のロジツクを
バイパスできるものである。
To achieve the above objectives, the present invention includes a bypass switch that enables bypass and activates an alarm when turned on, and an interlock contact that closes only when the reactor satisfies predetermined safety conditions. and a time-limited contact, which is energized while issuing an alarm when the bypass switch is turned on, are connected in series, effectively preventing the bypass during reactor operation or forgetting to return the bypass switch, and allowing the bypass switch to be activated as needed. It is possible to bypass the logic of the reactor protection system.
以下、図面を参照しながら本考案の一実施例を
詳細に説明する。
Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
図は本考案にかかるバイパス回路の一実施例を
含む原子炉保護系を示す系統図であつて、電源母
線12とアース線13との間にそれぞれ複数の常
閉接点が直列に接続された常閉接点群9および1
0並びにスクラム用リレーの励磁コイル11が直
列に接続された原子炉保護系が形成されている。
この常閉接点群9は原子炉停止中でもバイパスを
行うべきでない重要な異常項目が検出されたとき
に開となるスイツチの集合体であり、常閉接点群
10は原子炉停止中にバイパスを行う異常項目に
対応するスイツチの集合体である。 The figure is a system diagram showing a nuclear reactor protection system including an embodiment of the bypass circuit according to the present invention. Closed contact groups 9 and 1
0 and the excitation coil 11 of the scram relay are connected in series to form a reactor protection system.
This normally closed contact group 9 is a collection of switches that open when an important abnormality item that should not be bypassed even when the reactor is shut down is detected, and the normally closed contact group 10 is a set of switches that are opened when a critical abnormality item that should not be bypassed even when the reactor is shut down is operated. This is a collection of switches that correspond to abnormal items.
本考案にかかるバイパス回路は常閉接点群10
の両端間にこれと並列に接続されており、バイパ
ススイツチ1、インタロツク接点3、タイマ接点
5が直列に接続された構成を有している。また、
このタイマ接点5を通電により所定時間だけ閉成
させるタイマ励磁コイル4およびバイパススイツ
チ1に連動して動作する補助スイツチ2が電源母
線12とアース線13との間で直列に接続されて
おり、さらに警報リレー6がタイマ励磁コイル4
に並列に接続されている。これらのタイマ励磁コ
イル4および警報リレー6は通電されることによ
りそれぞれブザー、ランプ等の警報器7および8
を駆動する。また、上述のインタロツク接点3は
原子炉の誤動作、運転員の誤操作を防止するため
装置自体がある制限条件を満したことが判断され
たときに制御装置(図示せず)から発生するイン
タロツク許可信号INTによつて閉じられる。こ
のインタロツク許可信号の発生条件は原子炉やシ
ステムにより任意に組合せが可能であるが、例え
ばモードスイツチが燃料棒交換位置にあること、
原子炉圧力が1Kg/cm2以下であること、炉水温度
が100℃以下であること等を適当に組合わせれば
よい。 The bypass circuit according to the present invention has a normally closed contact group 10.
A bypass switch 1, an interlock contact 3, and a timer contact 5 are connected in series. Also,
A timer excitation coil 4 that closes the timer contact 5 for a predetermined time by energizing it, and an auxiliary switch 2 that operates in conjunction with the bypass switch 1 are connected in series between the power supply bus 12 and the ground wire 13. Alarm relay 6 is timer excitation coil 4
are connected in parallel. These timer excitation coils 4 and alarm relays 6 are energized to activate alarm devices 7 and 8, such as buzzers and lamps, respectively.
to drive. In addition, the above-mentioned interlock contact 3 is an interlock permission signal that is generated from a control device (not shown) when it is determined that the device itself satisfies certain limiting conditions in order to prevent malfunctions of the reactor and erroneous operations by operators. Closed by INT. The conditions for generating this interlock permission signal can be arbitrarily combined depending on the reactor and system, but for example, the mode switch is in the fuel rod exchange position,
The reactor pressure should be 1 Kg/cm 2 or less, the reactor water temperature should be 100° C. or less, etc. in an appropriate combination.
次に、このバイパス回路の作用について説明す
る。 Next, the operation of this bypass circuit will be explained.
原子炉停止状態で特に異常が発生していなけれ
ば、常閉接点群9および10の各接点はすべて閉
成状態にあり、スクラム用リレー励磁コイル11
は電源母線12とアース線13間で常時励磁状態
にあり、原子炉スクラム発生が防止されている。 If no abnormality has occurred in the reactor shutdown state, all the contacts in the normally closed contact groups 9 and 10 are in the closed state, and the scram relay excitation coil 11
is constantly energized between the power supply bus 12 and the ground wire 13, preventing reactor scram from occurring.
この状態でバイパススイツチ1を投入すると、
これに連動して補助スイツチ2が投入され、タイ
マ励磁コイル4および警報リレー6が付勢され
る。このタイマ励磁コイル4の付勢によりタイマ
接点5は閉成され、所定時間の経過後再び開とな
る。同様にこのタイマにより警報器7が駆動さ
れ、タイマ接点5が閉じている間警報を発生す
る。また警報リレー6によりバイパススイツチが
閉状態にある間は警報器8が駆動される。 If you turn on bypass switch 1 in this state,
In conjunction with this, the auxiliary switch 2 is turned on, and the timer excitation coil 4 and alarm relay 6 are energized. The timer contact 5 is closed by the energization of the timer excitation coil 4, and is opened again after a predetermined time has elapsed. Similarly, the alarm device 7 is driven by this timer and generates an alarm while the timer contact 5 is closed. Furthermore, the alarm device 8 is driven by the alarm relay 6 while the bypass switch is in the closed state.
一方、原子炉が停止状態にあり、所定の安全条
件を満しているときは制御装置(図示せず)より
インタロツク許可信号により、インタロツク接点
3は閉じられる。したがつて、逆に原子炉運転中
はバイパスを行うことができない。 On the other hand, when the reactor is in a stopped state and predetermined safety conditions are met, the interlock contact 3 is closed by an interlock permission signal from a control device (not shown). Therefore, on the contrary, bypass cannot be performed while the reactor is operating.
このようにバイパススイツチ1、インタロツク
接点3、タイマ接点5がすべて閉となることによ
り原子炉保護系のバイパスが可能になり、常閉接
点群10の接点を開成しながら、例えばセンサの
保守、校正を行うことができる。 By closing all of the bypass switch 1, interlock contact 3, and timer contact 5 in this way, it becomes possible to bypass the reactor protection system, and while the normally closed contacts 10 are opened, maintenance and calibration of the sensor can be carried out, for example. It can be performed.
原子炉保護系のロジツクがバイパス中であるこ
とは警報器7および8により警報される。またタ
イマの動作によつてそのタイマ接点5は所定時間
経過後に開成し、バイパス回路は自動的に解除さ
れる。このとき、バイパススイツチ1が投入され
たままになつているときは警報リレー6によつて
警報器8が駆動されているから、運転員にバイパ
ススイツチ1の切り忘れを知らせることになる。 Alarms 7 and 8 warn that the logic of the reactor protection system is being bypassed. Further, due to the operation of the timer, the timer contact 5 is opened after a predetermined period of time has elapsed, and the bypass circuit is automatically released. At this time, since the alarm device 8 is driven by the alarm relay 6 while the bypass switch 1 remains on, the operator is notified that the bypass switch 1 has been turned off.
なお、常閉接点群9の接点の一つが開状態にな
つたときは重大な異常が発生したときであるから
バイパスの有無にかかわらずスクラム用リレーの
励磁コイル11は非励磁状態になるので原子炉ス
クラムが行われる。 Note that when one of the contacts in the normally closed contact group 9 becomes open, it means that a serious abnormality has occurred, so the excitation coil 11 of the scram relay becomes de-energized regardless of whether there is a bypass or not. A furnace scram is performed.
以上の実施例において、バイパススイツチ1、
インタロツク接点3、タイマ接点5はこの順に直
列接続されているが、これらの構成要素が直列さ
れているものであれば順序を問うものではなく、
また他の接点等が介在していてもよい。また、タ
イマ接点は実施例中では開デイレイ型の限時接点
を用いているが、閉デイレイ型、すなわち常閉接
点が所定時間経過後に開成する型式のものを使用
することもできる。なお、限時接点の動作時間は
保守、校正等の所要時間を勘案して任意に選択す
ることができる。また警報器7および8は前述の
ブザー、ランプ以外の公知のあらゆる型式のもの
を使用することができ、例えばタイマ設定時間の
残り時間を併せて表示すること等が可能である。 In the above embodiment, the bypass switch 1,
The interlock contact 3 and timer contact 5 are connected in series in this order, but the order does not matter as long as these components are connected in series.
Further, other contacts or the like may be present. Furthermore, although an open delay type time-limited contact is used as the timer contact in the embodiment, a closed delay type, that is, a normally closed contact that opens after a predetermined period of time has elapsed may also be used. Note that the operating time of the time-limited contact can be arbitrarily selected in consideration of the time required for maintenance, calibration, etc. Further, the alarms 7 and 8 can be of any known type other than the above-mentioned buzzer and lamp, and can also display, for example, the remaining time of the timer setting time.
以上のように本考案にかかる原子炉保護系のバ
イパス回路においては所定の安全条件が満足され
たときのみ閉成されるインタロツク接点と、投入
により警報器を作動させるバイパススイツチと、
このバイパススイツチの投入により警報を発しつ
つ付勢される限時接点とを直列接続した構成を有
しているので、バイパス条件に合致しないときは
バイパスが行われず原子炉運転中の誤バイパスを
防止でき、またバイパスはセンサの保守、校正等
に必要な時間を限つて行われるため、原子炉保護
系がバイパスされたまま原子炉の起動や運転が行
われることがなく、原子炉の高い安全性を維持し
た状態でのバイパスを可能にする。さらにバイパ
ススイツチの投入および限時接点の閉成について
警報がなされているため、運転員にバイパス回路
の状態を適切に知らせることができ、安全性をさ
らに高めることができる。
As described above, the bypass circuit of the reactor protection system according to the present invention includes an interlock contact that is closed only when a predetermined safety condition is satisfied, and a bypass switch that activates an alarm when turned on.
Since it has a configuration in which a time-limited contact is connected in series with a time-limited contact that is energized while issuing an alarm when the bypass switch is turned on, bypass is not performed when the bypass conditions are not met, preventing erroneous bypass during reactor operation. In addition, since bypassing is performed within the time required for sensor maintenance, calibration, etc., the reactor is not started up or operated with the reactor protection system bypassed, which increases the safety of the reactor. Enables bypass in a maintained state. Further, since a warning is issued regarding the closing of the bypass switch and the closing of the time-limited contact, the operator can be appropriately informed of the state of the bypass circuit, further increasing safety.
図は本考案にかかるバイパス回路を有する原子
炉保護系の一部の構成を示す系統図である。
1……バイパススイツチ、2……補助スイツ
チ、3……インタロツク接点、4……タイマ励磁
コイル、5……タイマ接点、6……警報リレー、
7,8……警報器、9,10……常閉接点群、1
1……スクラム用リレー励磁コイル、12……電
源母線、13……アース線。
The figure is a system diagram showing a partial configuration of a nuclear reactor protection system having a bypass circuit according to the present invention. 1... Bypass switch, 2... Auxiliary switch, 3... Interlock contact, 4... Timer excitation coil, 5... Timer contact, 6... Alarm relay,
7, 8... Alarm, 9, 10... Normally closed contact group, 1
1... Scram relay excitation coil, 12... Power bus, 13... Earth wire.
Claims (1)
護系のロジツクの一部を必要に応じてバイパスさ
せる原子炉保護系のバイパス回路において、 投入によりバイパスを可能にすると共に警報器
を作動させるバイパススイツチと、 前記原子炉が停止状態でかつ所定の安全条件を
満足しているときにのみ閉成されるインタロツク
の接点と、 前記バイパススイツチの投入により、警報を発
しつつ付勢される限時接点と、 を直接接続したことを特徴とする原子炉保護系の
バイパス回路。[Scope of Claim for Utility Model Registration] In a bypass circuit of a reactor protection system that bypasses a part of the logic of the reactor protection system that makes an emergency shutdown of the reactor in the event of an abnormality as necessary, the bypass circuit enables bypass by turning on the system. a bypass switch that activates the alarm; an interlock contact that closes only when the reactor is in a stopped state and satisfies predetermined safety conditions; A bypass circuit for a nuclear reactor protection system, characterized in that a time-limited contact that is energized and is directly connected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1984011736U JPS60123693U (en) | 1984-01-31 | 1984-01-31 | Reactor protection system bypass circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1984011736U JPS60123693U (en) | 1984-01-31 | 1984-01-31 | Reactor protection system bypass circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60123693U JPS60123693U (en) | 1985-08-20 |
JPH0355120Y2 true JPH0355120Y2 (en) | 1991-12-06 |
Family
ID=30494132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1984011736U Granted JPS60123693U (en) | 1984-01-31 | 1984-01-31 | Reactor protection system bypass circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60123693U (en) |
-
1984
- 1984-01-31 JP JP1984011736U patent/JPS60123693U/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS60123693U (en) | 1985-08-20 |
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