JP2505808B2 - Control rod drive hydraulic device - Google Patents
Control rod drive hydraulic deviceInfo
- Publication number
- JP2505808B2 JP2505808B2 JP62146059A JP14605987A JP2505808B2 JP 2505808 B2 JP2505808 B2 JP 2505808B2 JP 62146059 A JP62146059 A JP 62146059A JP 14605987 A JP14605987 A JP 14605987A JP 2505808 B2 JP2505808 B2 JP 2505808B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling water
- control rod
- vibration absorbing
- water
- valve
- 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 - Lifetime
Links
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
- Details Of Valves (AREA)
- Check Valves (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、制御棒駆動水圧装置に係り、特に、制御棒
駆動機構（CRD）に冷却水および制御棒挿入・引抜駆動
用の駆動水を供給する水圧制御ユニットへの冷却水供給
ラインに、チェックボール内蔵型冷却水逆止弁を備えた
制御棒駆動水圧装置において、前記チェックボールの振
動および異音を抑制し、制御棒駆動速度の変動を防止す
るとともに、各CRDへの冷却水配分を適正に調整するの
に好適な制御棒駆動水圧装置に関する。Description: TECHNICAL FIELD The present invention relates to a control rod drive water pressure device, and in particular, to a control rod drive mechanism (CRD) for supplying cooling water and control rod insertion / pull-out drive water. In a control rod drive water pressure device equipped with a check ball built-in cooling water check valve in the cooling water supply line to the water pressure control unit to be supplied, vibration and abnormal noise of the check ball are suppressed, and control rod drive speed fluctuations. The present invention relates to a control rod drive water pressure device suitable for preventing the above and appropriately adjusting the distribution of cooling water to each CRD.
従来の制御棒駆動水圧装置の系統構成の一例を第４図
に示す。本例においては、制御棒４を駆動していないと
きにも、CRD6の駆動ピストン８のシール部を冷却するた
めに、復水貯留タンク54から駆動水ポンプ52,系統流量
調整弁50,圧力調節弁46および平衡弁48,冷却水ヘッダ44
から冷却水供給ライン42の途中に設けた冷却水逆止弁36
を通って、冷却水配管34および挿入配管10により、CRD6
に向う冷却水供給系統を設けてある。FIG. 4 shows an example of the system configuration of a conventional control rod drive water pressure device. In this example, in order to cool the seal portion of the drive piston 8 of the CRD 6 even when the control rod 4 is not driven, the condensate storage tank 54 drives the drive water pump 52, the system flow rate control valve 50, and the pressure control. Valve 46 and balance valve 48, cooling water header 44
From the cooling water supply line 42 to the cooling water check valve 36
Through the cooling water pipe 34 and the insertion pipe 10.
There is a cooling water supply system for.
制御棒４が停止している状態においては、制御棒駆動
水圧装置は、CRD6の保護のために、冷却水供給モードに
なっている。CRD6の内部には、各種のシールパッキング
およびシールブッシュが使用され、高温の炉心部からの
熱の影響によりこれらの部材が劣化するのを防ぐため
に、原子炉運転中は、常時冷却水を供給している。When the control rod 4 is stopped, the control rod drive water pressure device is in the cooling water supply mode in order to protect the CRD 6. Various seal packings and seal bushes are used inside the CRD6.To prevent these members from deteriorating under the influence of heat from the hot core, cooling water is constantly supplied during operation of the reactor. ing.
上記冷却水供給系統のうち、冷却逆止弁36は、第５図
に示すように、弁ボディ36Aとチェックボール36Bと弁シ
ート36Cとからなり、冷却水配管42側の冷却水流路42Aか
ら冷却水配管34の冷却水流路34A側に冷却水が流れる構
造となっている。In the cooling water supply system, the cooling check valve 36, as shown in FIG. 5, includes a valve body 36A, a check ball 36B, and a valve seat 36C, and is cooled from the cooling water passage 42A on the cooling water pipe 42 side. It has a structure in which cooling water flows to the cooling water flow path 34A side of the water pipe 34.
この冷却水逆止弁36に振動や異音が生じ、弁を閉じる
動作が不完全または不確実になる現象が生じる恐れがあ
る。このように、冷却水逆止弁36に振動や異音が生じる
原因は、制御棒駆動水圧装置の配管または弁等の構成部
品内に空気泡が残留したり、配管中または弁等の構成部
品内で圧力振動が起り、蒸気泡が発生したりすることで
ある。このような現象は、制御棒の駆動時に、挿入配管
側から冷却水配管側に付加される圧力により、空気泡や
蒸気泡が、圧縮されて吸収されてしまい、冷却水逆止弁
に閉止に充分な圧力が伝達されず、閉動作が不確実にな
る場合と、空気泡および蒸気泡が、制御棒駆動時に発生
する挿入配管側と冷却水配管側との急変加圧差により、
挿入配管側からチェックボール部に急速流入し、冷却水
配管側に通過するため、チェックボールに振動を与え、
閉動作を不確実にする場合とがある。Vibration or noise may occur in the cooling water check valve 36, resulting in a phenomenon in which the valve closing operation becomes incomplete or uncertain. As described above, the cause of the vibration or noise of the cooling water check valve 36 is that air bubbles remain in the components such as the pipe or the valve of the control rod drive water pressure device, or the components such as in the pipe or the valve. This means that pressure vibrations occur inside and vapor bubbles are generated. Such a phenomenon is caused by the pressure applied from the insertion pipe side to the cooling water pipe side when the control rod is driven, whereby air bubbles and vapor bubbles are compressed and absorbed, and the cooling water check valve is closed. When sufficient pressure is not transmitted and the closing operation becomes uncertain, and when air bubbles and steam bubbles are generated due to the sudden pressure difference between the insertion pipe side and the cooling water pipe side that occurs when the control rod is driven,
Since it rapidly flows into the check ball from the insertion pipe side and passes through to the cooling water pipe side, vibration is applied to the check ball,
The closing operation may be uncertain.
冷却水逆止弁の不安定作動を防止し、制御棒の駆動を
確実にする方法として、例えば特開昭61-144593号公報
に示されるように、冷却水逆止弁の代りに、冷却水配管
の途中に遠隔操作弁を設け、この遠隔操作弁を制御駆動
時には閉じる方法が知られている。この方法では、電気
信号の入力により開閉する遠隔操作弁と制御用電気シス
テムとを必要とし、設備が複雑化する。As a method of preventing the unstable operation of the cooling water check valve and ensuring the drive of the control rod, for example, as shown in Japanese Patent Laid-Open No. 61-144593, instead of the cooling water check valve, cooling water is used. A method is known in which a remote control valve is provided in the middle of piping and the remote control valve is closed during control drive. This method requires a remote control valve that opens and closes when an electric signal is input and an electric control system, which complicates the equipment.
なお、水圧制御ユニット内方向制御弁の作動不良によ
る制御棒の異常挿入および異常引抜きの防止を目的とし
たものには、特願昭60-104287号等がある。また、CRDへ
の冷却水の流量調整を目的としたものは、特願昭58-173
065号等がある。Note that Japanese Patent Application No. 60-104287 and the like have been proposed for the purpose of preventing abnormal insertion and withdrawal of the control rod due to defective operation of the water pressure control unit inward control valve. In addition, Japanese Patent Application No. 58-173 was used for the purpose of adjusting the flow rate of cooling water to the CRD.
There is No. 065.
上記従来技術は、CRDの水圧制御ユニット内冷却水逆
止弁の振動や異音および制御棒駆動速度変動を防止する
ために、遠隔操作弁による方法すなわち電気的方法を解
決手段としており、装置の複雑化を免れず、誤信号等の
新たな電気的トラブルが発生する恐れがある。このトラ
ブル要因を少なくするためには、二重の保証回路等を設
けるなどしなければならず、設備システムがますます複
雑化するという問題があった。The above-mentioned conventional technology uses a method using a remote control valve, that is, an electrical method, as a solution, in order to prevent vibration and abnormal noise of the cooling water check valve in the water pressure control unit of the CRD, and control rod drive speed fluctuations. There is a risk that new electrical troubles such as erroneous signals will occur without avoiding complication. In order to reduce the cause of this trouble, it is necessary to provide a double guarantee circuit and the like, and there is a problem that the facility system becomes more and more complicated.
一方、実開昭60-185299号は、チェックボール36Bの径
によっては弁シート36Cへの着座性が悪くなることが、C
RDの水圧制御ユニット内冷却水逆止弁の振動や異音およ
び制御棒駆動速度変動の原因であるとして、チェックボ
ール36Bの径Ｄと弁シート36Cの孔径D1との関係を所定範
囲内に規制した冷却水用逆止弁を提案している。On the other hand, in Japanese Utility Model No. 60-185299, depending on the diameter of the check ball 36B, the seatability on the valve seat 36C may deteriorate.
The relationship between the diameter D of the check ball 36B and the hole diameter D1 of the valve seat 36C is regulated within a predetermined range as the cause of vibration and noise of the cooling water check valve in the water pressure control unit of the RD and fluctuation of the control rod drive speed. A check valve for cooling water is proposed.
最近の我々の知見によれば、逆止弁に逆圧が急激に負
荷されたときのチエックボール36Bの着座性は、D1,D2の
関係の規制だけでは改善できず、むしろチエックボール
36Bの径D2と弁ボデイ36Aのボール収納部内径Ｄとの関係
が重要であることが判明した。逆圧が負荷されると、チ
エックボール36Bは、逆圧流のなかで揺動する。その際
に、チエックボール36Bと弁ボデイ36Aとの隙間Ｄ−D2が
大きいと、それだけチエックボール36Bの揺動量が大き
くなり、弁シート36Cの着座孔との芯ずれおよび逆圧流
の冷却水側への漏洩量が多くなるために、振動を生じ、
チエックボール36Bの弁シート36Cへの着座性が悪くな
り、制御棒駆動速度変動を来していた。According to our recent knowledge, the seatability of the check ball 36B when the check valve is suddenly loaded with reverse pressure cannot be improved only by the regulation of the relationship of D1 and D2.
It was found that the relationship between the diameter D2 of 36B and the inner diameter D of the ball storage portion of the valve body 36A is important. When the counter pressure is applied, the check ball 36B swings in the counter pressure flow. At that time, if the gap D-D2 between the check ball 36B and the valve body 36A is large, the swing amount of the check ball 36B is increased accordingly, and the misalignment with the seating hole of the valve seat 36C and the back pressure flow toward the cooling water side occur. The amount of leakage of the
The seatability of the check ball 36B on the valve seat 36C deteriorated, and the control rod drive speed fluctuated.
チエックボールの着座性を改善するには、チエックボ
ールの開閉時の移動を阻害しない範囲で前記隙間Ｄ−D2
をできるだけ小さくして、逆圧流の冷却水側への漏洩お
よびチエックボールの揺動を防ぐことが肝要であると推
察される。このようにすると、実開昭60-185299号が規
制するD2/D1の範囲にとらわれないで、着座性の問題を
解決できると考えられる。In order to improve the seatability of the check ball, the gap D-D2 is provided within a range that does not hinder the movement of the check ball when opening and closing.
It is inferred that it is important to make the pressure as small as possible to prevent leakage of back pressure flow to the cooling water side and swing of the check balls. By doing so, it is considered that the problem of seating property can be solved without being restricted by the range of D2 / D1 regulated by Jitsukai Sho 60-185299.
本発明の目的は、従来技術の冷却水逆止弁が電気的制
御を必要としないという利点を生かしつつ、制御棒駆動
水圧装置における冷却水逆止弁の振動や異音および制御
棒駆動速度変動を防止し、併せて、CRDへの冷却水を適
正に配分できる制御棒駆動水圧装置を提供することであ
る。It is an object of the present invention to utilize the advantage that the cooling water check valve of the prior art does not require electrical control, while vibrating or abnormal noise of the cooling water check valve in the control rod drive water pressure device and controlling rod drive speed fluctuation. The present invention is to provide a control rod drive water pressure device that can prevent the above and also appropriately distribute the cooling water to the CRD.
本発明は、上記目的を達成するために、制御棒駆動機
構に冷却用および制御棒挿入・引抜駆動用の冷却水を供
給する水圧制御ユニットへの冷却水の供給ラインに、チ
ェックボール内蔵型冷却水逆止弁を備えた制御棒駆動水
圧装置において、チェックボール内蔵型冷却水逆止弁
が、供給ラインに連通する孔を側面に有しチェックボー
ルを収納する振動吸収ケージを含むチェックボールの振
動吸収機構を備えた制御棒駆動水圧装置を提案するもの
である。In order to achieve the above-mentioned object, the present invention provides a check ball built-in type cooling system in a cooling water supply line to a water pressure control unit that supplies cooling water to a control rod drive mechanism and control rod insertion / withdrawal drive. In a control rod drive water pressure device equipped with a water check valve, a check ball built-in type cooling water check valve vibrates a check ball including a vibration absorbing cage that has a hole on the side that communicates with the supply line and stores the check ball. The present invention proposes a control rod drive hydraulic device equipped with an absorption mechanism.
連通孔は、振動吸収ケージの側面に、しかも振動吸収
ケージの軸対称に、複数個形成することが望ましい。It is desirable to form a plurality of communication holes on the side surface of the vibration absorbing cage and symmetrically with respect to the vibration absorbing cage.
振動吸収機構は、チェックボールを収納する振動吸収
ケージと、逆止弁本体と振動吸収ケージとの間に配置し
た振動吸収体とで構成することもできる。The vibration absorbing mechanism may be composed of a vibration absorbing cage that houses the check ball and a vibration absorbing body that is arranged between the check valve body and the vibration absorbing cage.
振動吸収機構には、振動吸収ケージの冷却水流入側端
面に冷却水供給流量調整オリフィスを備えてもよい。The vibration absorbing mechanism may include a cooling water supply flow rate adjusting orifice on the cooling water inflow side end surface of the vibration absorbing cage.
本発明においては、チェックボール内蔵型冷却水逆止
弁が、供給ラインに連通する孔を側面に有しチェックボ
ールを収納する振動吸収ケージを含むチェックボールの
振動吸収機構を備えたので、チェックボールの振動およ
び異音が生じてもすぐに抑制され、CRDの速度変動が防
止される。In the present invention, since the cooling water check valve with a built-in check ball is provided with the vibration absorbing mechanism of the check ball including the vibration absorbing cage having the hole communicating with the supply line on the side surface and storing the check ball. Even if vibration and abnormal noise occur, it is immediately suppressed, and CRD speed fluctuations are prevented.
連通孔すなわち冷却水出口流路を、振動吸収ケージの
側面に、振動吸収ケージの軸対称に複数個形成すると、
冷却水が流れるとき、振動吸収ケージの前記軸から放射
方向へのチェックボールの片寄りやゆらぎが少なくな
り、CRDの速度変動が防止される。すなわち、振動吸収
ケージの側面に、複数個の冷却水出口流路が設けて、こ
の冷却水出口流路の大きさ，形状，数，位置等を変える
と、冷却水の必要流量を確保しつつ、逆圧が急激に負荷
されたときの水撃波が冷却水側に直接伝わるのを緩和で
きる。If a plurality of communication holes, that is, cooling water outlet flow paths are formed on the side surface of the vibration absorbing cage in axial symmetry of the vibration absorbing cage,
When the cooling water flows, the deviation and fluctuation of the check ball in the radial direction from the axis of the vibration absorbing cage are reduced, and the fluctuation of the CRD speed is prevented. That is, by providing a plurality of cooling water outlet channels on the side surface of the vibration absorbing cage and changing the size, shape, number, position, etc. of the cooling water outlet channels, the required flow rate of cooling water is secured. , It is possible to reduce the direct transmission of the water hammer wave to the cooling water side when the back pressure is suddenly applied.
本発明の流量調整オリフィスは、CRD個々にCRDへの冷
却水の流量を調整することを目的に設置してある。大き
い原子力プラントでは、例えば185本のCRDが原子炉に装
着されており、原子炉内の配置位置により温度環境がそ
れぞれ異なる。このように、温度条件の異なるCRD個々
に適正量の冷却水を供給することは、冷却水流量調整機
構の無い上記実開昭60-185299号ではできなかった。The flow rate adjusting orifice of the present invention is installed for the purpose of adjusting the flow rate of cooling water to each CRD. In a large nuclear power plant, for example, 185 CRDs are installed in a nuclear reactor, and the temperature environment varies depending on the arrangement position in the nuclear reactor. As described above, it was not possible to supply an appropriate amount of cooling water to each of the CRDs having different temperature conditions in the above-mentioned No. 60-185299, which has no cooling water flow rate adjusting mechanism.
本発明によりオリフィスを冷却水逆止弁内に設ける
と、従来、CRD内にあったオリフィスを削除でき、CRD内
オリフィスの目詰りによる温度上昇を防止できる。従来
のような構造では、原子炉運転中にCRD内オリフィスが
目詰りした場合、分解調整等は一切不可能であったが、
水圧制御ユニットは必要なときに隔離弁を閉じ、系統を
隔離すれば、分解調整が可能であり、万一冷却水逆止弁
内のオリフィスに異常が生じても、容易に点検調整でき
る。When the orifice is provided in the cooling water check valve according to the present invention, the orifice which has been conventionally in the CRD can be eliminated, and the temperature rise due to the clogging of the orifice in the CRD can be prevented. With the conventional structure, if the orifice in the CRD was clogged during reactor operation, disassembly and adjustment were impossible, but
The water pressure control unit can be disassembled and adjusted by closing the isolation valve when necessary and isolating the system, and even if an abnormality occurs in the orifice in the cooling water check valve, it can be easily inspected and adjusted.
また、本構造では、電気を使わないので、多重保証回
路等を付けなくても、信頼性が低下しない。したがっ
て、従来とコストがほとんど変わらず、従来のシステム
にもバックフィット可能である。Moreover, in this structure, since electricity is not used, reliability is not deteriorated even if a multiplex guarantee circuit or the like is not provided. Therefore, the cost is almost the same as the conventional one, and it can be back-fitted to the conventional system.
次に、第１図〜第３図を参照して、本発明の一実施例
を説明する。Next, an embodiment of the present invention will be described with reference to FIGS.
第１図は、本発明による制御棒駆動水圧装置の一実施
例の系統構成を示す図である。FIG. 1 is a diagram showing a system configuration of an embodiment of a control rod drive hydraulic device according to the present invention.
第１図において、２は原子炉圧力容器、４はその炉心
に挿入または引抜きされる制御棒、６は駆動ピストン８
により前記制御棒４を駆動するCRD、10はCRD6に挿入時
の圧力水を供給する挿入配管、12は逆に制御棒を引抜く
ときに駆動ピストン８の上側に圧力水を供給する引抜配
管、14は水圧制御ユニット、16は制御棒の挿入と引抜き
とを切換える四つの弁18〜24を有する常駆動切換弁、26
は原子炉スクラム時に引抜き側の水を排出するためのス
クラム出口弁、28は排出された水の排出ヘッダ、30はス
クラム時に制御棒を緊急挿入するためのスクラム入口
弁、32はその高圧水を供給するアキュムレータ、34はす
でに述べたように制御棒停止時にもCRDのシール部に冷
却水を供給する冷却水配管、37は本発明による冷却水逆
止弁、そのうち38は、振動吸収機構逆止弁、40は冷却水
流量調整機構としてのオリフィス、42は冷却水供給ライ
ン、44は冷却水ヘッダ、46は圧力調節弁、48は圧力調節
弁46と並列の平衡弁、50は系統流量調整弁、52は駆動水
ポンプ、54は復水貯留タンク、56は充填水ライン、58は
充填水ヘッダ、60は駆動水供給ライン、62は駆動水供給
ヘッダ、64は排出水ライン、66は排出水ヘッダである。In FIG. 1, 2 is a reactor pressure vessel, 4 is a control rod to be inserted into or extracted from the reactor core, 6 is a drive piston 8
CRD for driving the control rod 4, 10 is an insertion pipe for supplying pressure water to the CRD 6 at the time of insertion, 12 is a drawing pipe for supplying pressure water to the upper side of the drive piston 8 when the control rod is withdrawn, 14 is a water pressure control unit, 16 is a normal drive switching valve having four valves 18 to 24 for switching between insertion and withdrawal of a control rod, 26
Is a scrum outlet valve for discharging water on the extraction side during reactor scram, 28 is a drain header for discharged water, 30 is a scrum inlet valve for emergency insertion of control rod during scram, and 32 is high pressure water. An accumulator to be supplied, 34 is a cooling water pipe for supplying cooling water to the seal portion of the CRD even when the control rod is stopped, 37 is a cooling water check valve according to the present invention, and 38 is a vibration absorbing mechanism check. A valve, 40 is an orifice as a cooling water flow rate adjusting mechanism, 42 is a cooling water supply line, 44 is a cooling water header, 46 is a pressure control valve, 48 is a balance valve in parallel with the pressure control valve 46, and 50 is a system flow rate control valve. , 52 is a driving water pump, 54 is a condensate storage tank, 56 is a filling water line, 58 is a filling water header, 60 is a driving water supply line, 62 is a driving water supply header, 64 is a discharging water line, and 66 is discharging water. It is a header.
本実施例の特徴は、第５図の冷却水逆止弁36に代え
て、振動吸収機構付逆止弁38と冷却水流量を調整するオ
リフィス40とからなる冷却水逆止弁37を備えた点であ
る。The feature of this embodiment is that a cooling water check valve 37 including a vibration absorbing check valve 38 and an orifice 40 for adjusting the cooling water flow rate is provided in place of the cooling water check valve 36 of FIG. It is a point.
第２図は、オリフィス40を内蔵した振動吸収機構付逆
止弁38を示す断面図である。FIG. 2 is a sectional view showing a check valve 38 with a vibration absorbing mechanism, which has an orifice 40 built therein.
本実施例の振動吸収機構付逆止弁38は、弁ボディ38A
と、チェックボール38Bと、振動吸収ケージ38Dと、振動
吸収体38Eとからなる。振動吸収ケージ38Dにはその下端
に冷却水流量調整機構としてのオリフィス40を設けてあ
る。振動吸収体38Eは、本実施例のように、ゴム系材質
または樹脂系材質からなりそれ自体が吸収能力を有する
場合と、第３図のように、さらばねの形状に構成し振動
を吸収させる場合とがある。The check valve 38 with the vibration absorbing mechanism of the present embodiment is provided with the valve body 38A.
And a check ball 38B, a vibration absorbing cage 38D, and a vibration absorber 38E. The vibration absorbing cage 38D is provided at its lower end with an orifice 40 as a cooling water flow rate adjusting mechanism. The vibration absorber 38E is made of a rubber-based material or a resin-based material as in the present embodiment and has its own absorbing ability, and is constructed in the shape of a flat spring to absorb vibrations as shown in FIG. There are cases.
なお、系統流量調整弁50は、全CRDのシール部を保護
するのに必要な水圧をもつ冷却水流量を供給できるよう
に、定常設定流量に合わせて自動的に制御され、冷却水
供給ライン42,水圧制御ユニット14,挿入配管10を経てCR
D6に冷却水を供給する。圧力調節弁46は、制御棒４の挿
入または引抜きを行なうCRD6の常駆動操作に必要な水圧
をもつ駆動水に調整し、平衡弁48内のいずれかの弁を開
閉して、制御棒４の挿入または引抜時に安定した駆動水
流量を駆動水供給ライン60,水圧制御ユニット14,挿入配
管10または引抜配管12を経て、CRD6に供給する。The system flow rate adjusting valve 50 is automatically controlled in accordance with the steady set flow rate so that the cooling water flow rate having the water pressure necessary to protect the seal parts of all CRDs can be supplied, and the cooling water supply line 42 CR via the water pressure control unit 14 and the insertion pipe 10.
Supply cooling water to D6. The pressure control valve 46 adjusts to drive water having a water pressure necessary for the normal drive operation of the CRD 6 for inserting or withdrawing the control rod 4, and any valve in the balance valve 48 is opened or closed to open the control rod 4. A stable flow rate of driving water at the time of insertion or withdrawal is supplied to the CRD 6 through the driving water supply line 60, the water pressure control unit 14, the insertion pipe 10 or the withdrawal pipe 12.
次に、このような構成の本発明による制御棒駆動水圧
装置により、制御棒を出し入れする動作について説明す
る。Next, the operation of moving the control rod in and out by the control rod drive water pressure device according to the present invention having such a configuration will be described.
原子炉圧力容器２内の制御棒４を挿入するすなわち上
方に移動させる場合、駆動水ポンプ52で昇圧された高圧
水は、系統流量調整弁50を通り、圧力調節弁46で駆動に
必要な駆動水圧に調整される。流量平衡弁48の引抜側が
閉じ、１本のCRDの挿入駆動に必要な流量が駆動水供給
ヘッダ62を経て、水圧制御ユニット14内の常駆動切換弁
18を介し、CRD6の駆動ピストン８の下部室に供給され、
駆動ピストン８を押上げる。一方、駆動ピストン８の上
部室の水は、CRD6に接続されている引抜配管12により、
水圧制御ユニット14内の常駆動切換弁24を経て、排出水
ヘッダ66に流れ出る。When the control rod 4 in the reactor pressure vessel 2 is inserted, that is, moved upward, the high-pressure water boosted by the drive water pump 52 passes through the system flow control valve 50 and is driven by the pressure control valve 46 to drive it. Adjusted to water pressure. The withdrawal side of the flow balance valve 48 is closed, and the flow rate required to drive the insertion of one CRD is passed through the drive water supply header 62 and then the normal drive switching valve in the water pressure control unit 14.
Is supplied to the lower chamber of the drive piston 8 of the CRD 6 via 18.
Push up the drive piston 8. On the other hand, the water in the upper chamber of the drive piston 8 is discharged by the drawing pipe 12 connected to the CRD 6.
It flows out to the discharge water header 66 through the normal drive switching valve 24 in the water pressure control unit 14.
制御棒４を炉心から引抜くすなわち下方に移動させる
場合は、駆動水ポンプ52で昇圧された高圧水は、前述の
挿入モード時と同様、系統流量調整弁50を通り、圧力調
節弁46で駆動に必要な水圧に調整される。今度は流量平
衡弁48の挿入側が閉じ、１本の制御棒駆動装置の引抜駆
動に必要な流量が、駆動水供給ヘッダ62を経て、水圧制
御ユニット14内の常駆動切換弁20を介し、CRDの駆動ピ
ストン８の上部室に供給され、駆動ピストン８を押し下
げる。駆動ピストン８の下部室の水は、CRD6に接続され
ている挿入配管10から、水圧制御ユニット14内の常駆動
切換弁22を経て、排出水ヘッダ66に流出する。When pulling out the control rod 4 from the core, that is, moving it downward, the high-pressure water pressurized by the driving water pump 52 passes through the system flow rate adjusting valve 50 and is driven by the pressure adjusting valve 46, as in the insertion mode described above. It is adjusted to the water pressure required for. This time, the insertion side of the flow balance valve 48 is closed, and the flow rate necessary for pulling out drive of one control rod drive device passes through the drive water supply header 62, the normal drive switching valve 20 in the water pressure control unit 14, and the CRD. Is supplied to the upper chamber of the drive piston 8 and pushes down the drive piston 8. The water in the lower chamber of the drive piston 8 flows out from the insertion pipe 10 connected to the CRD 6 to the discharge water header 66 via the normal drive switching valve 22 in the water pressure control unit 14.
また、原子炉プラントに異常が発生し原子炉を緊急に
停止する必要が生じた場合、原子炉保護系からの信号を
受けて、水圧制御ユニット14内のスクラム入口弁30が自
動的に開き、アキュムレータ32に充填された高圧水が、
挿入配管10を経て、CRD6内の駆動ピストン８の下部室に
供給され、全制御棒４を急速に炉心内に挿入する。な
お、このときには、水圧制御ユニット14内のスクラム出
口弁26もスクラム入口弁30と同時に自動的に開かれるた
め、CRD6内の駆動ピストン８の上部室の水は、引抜配管
12,スクラム出口弁26を経て、スクラム排出ヘッダ28に
流出し、スクラム動作を確実に達成できるようになって
いる。Further, when an abnormality occurs in the reactor plant and it is necessary to stop the reactor urgently, a signal from the reactor protection system is received, and the scrum inlet valve 30 in the water pressure control unit 14 automatically opens, High-pressure water filled in the accumulator 32
It is supplied to the lower chamber of the drive piston 8 in the CRD 6 through the insertion pipe 10 and rapidly inserts all the control rods 4 into the core. At this time, since the scrum outlet valve 26 in the water pressure control unit 14 is automatically opened at the same time as the scrum inlet valve 30, the water in the upper chamber of the drive piston 8 in the CRD 6 is pulled out.
12, It flows out to the scrum discharge header 28 through the scrum outlet valve 26, and the scrum operation can be surely achieved.
冷却水供給流路について説明すると、駆動水ポンプ52
で昇圧された高圧水は、系統流量調節弁50で全制御棒駆
動装置に必要な冷却水供給流量と炉圧に対し常に一定差
圧を保持する冷却水圧に調整され、冷却水ヘッダ44を通
り、各水圧制御ユニット14および挿入配管10を経て、各
々のCRD6の駆動ピストン８の下部室に流入し、冷却水ポ
ートおよび冷却水オリフィスおよびシール部を通り、原
子炉内に流出する。なお、スクラム以外の時に、すなわ
ち常駆動操作の時に、CRDは、１本ずつ選択操作され、
操作されていないCRDは、所定位置で停止した状態にな
り、全て冷却モードにある。Explaining the cooling water supply passage, the driving water pump 52
The high-pressure water that has been increased in pressure is adjusted by the system flow control valve 50 to a cooling water pressure that always maintains a constant differential pressure with respect to the cooling water supply flow rate required for all control rod drives and the furnace pressure, and passes through the cooling water header 44. , Through each water pressure control unit 14 and the insertion pipe 10, flows into the lower chamber of the drive piston 8 of each CRD 6, passes through the cooling water port, the cooling water orifice, and the seal portion, and flows out into the reactor. In addition, at the time of other than scrum, that is, during the normal drive operation, the CRD is selected and operated one by one,
The CRDs that are not operated are stopped in place and are all in cooling mode.
本実施例の制御棒駆動水圧装置においては、制御棒の
挿入および引抜きならびに原子炉異常時の緊急停止操作
のいずれの場合も、従来技術と全く同じ操作ができ、制
御棒停止状態の冷却水供給モードにおいても全く変わり
がない。In the control rod drive water pressure device of the present embodiment, in any case of the control rod insertion and withdrawal and the emergency stop operation when the reactor is abnormal, the same operation as in the prior art can be performed, and the control rod stopped cooling water supply can be performed. There is no change in the mode.
なお、従来技術の冷却水逆止弁は、第５図に示すよう
に、弁ボディ36Aに弁シート36Cが形成されており、弁ボ
ディ36Aが冷却水配管34と溶接されているため、分解点
検および予備品との交換が非常に困難であったが、本発
明においては、弁シートを振動吸収ケージ38Dに形成し
てあるので、この部分の分解点検および予備品との交換
が容易にできる。As shown in FIG. 5, the conventional cooling water check valve has a valve seat 36C formed on a valve body 36A, and the valve body 36A is welded to the cooling water pipe 34. Although it was very difficult to replace with a spare part, in the present invention, since the valve seat is formed in the vibration absorbing cage 38D, this part can be easily disassembled and inspected and replaced with a spare part.
また、その下部には、冷却水流量調整機構としてのオ
リフィスを形成してあるので、各CRD6への流量を細かに
調整できる。Further, since an orifice as a cooling water flow rate adjusting mechanism is formed in the lower part thereof, the flow rate to each CRD 6 can be finely adjusted.
本発明によれば、冷却水逆止弁に振動吸収ケージを含
む振動吸収機構が備えられ、流路の径方向へのチエック
ボールの動きすなわち振動を制限し、逆圧水の冷却水側
への漏洩を少なくし、ボールの着座性を改善できるの
で、チェックボールの振動および異音の発生がなく、CR
Dの速度変動が防止される。According to the present invention, the cooling water check valve is provided with the vibration absorbing mechanism including the vibration absorbing cage, restricts the movement of the check balls in the radial direction of the flow path, that is, the vibration, and suppresses the back pressure water to the cooling water side. Since there is less leakage and the seatability of the ball can be improved, there is no vibration or abnormal noise of the check ball, and CR
D speed fluctuation is prevented.
また、冷却水逆止弁にオリフィスを備えた場合は、従
来、CRD内にあったオリフィスを削除でき、CRD内オリフ
ィスの目詰りによる温度上昇を防ぐことができる。万
一、冷却水逆止弁のオリフィスが目詰り等を生じた場合
にも、水圧制御ユニットを隔離し、分解調整することが
簡単である。Further, when the cooling water check valve is provided with an orifice, it is possible to eliminate the orifice which has conventionally been in the CRD and prevent the temperature rise due to the clogging of the orifice in the CRD. Even if the orifice of the cooling water check valve is clogged, it is easy to isolate the water pressure control unit and disassemble and adjust it.
振動吸収ケージの側面には、複数個の冷却水出口流路
が設けられている。この冷却水出口流路の大きさ，形
状，数，位置等を変えることにより、冷却水の必要流量
を確保しつつ、逆圧が急激に負荷されたときの水撃波が
冷却水側に直接伝わるのを緩和できる。A plurality of cooling water outlet channels are provided on the side surface of the vibration absorbing cage. By changing the size, shape, number, position, etc. of this cooling water outlet channel, the water hammer wave when a reverse pressure is suddenly applied is directly applied to the cooling water side while securing the required flow rate of the cooling water. You can ease the transmission.
さらに、冷却水逆止弁の駆動に電気を使わないので、
多重保証回路等を付けなくても、信頼性が低下しない。
したがって、従来とコストがほとんど変らず、また従来
のシステムにもバックフィト可能である。Furthermore, since electricity is not used to drive the cooling water check valve,
The reliability does not decrease even if the multiple guarantee circuit is not provided.
Therefore, the cost is almost the same as that of the conventional system, and the system can be back-fitted to the conventional system.
第１図は本発明による制御棒水圧装置の一実施例の系統
構成を示す図、第２図は第１図の実施例に用いる冷却水
逆止弁の一例の構成を示す縦断面図、第３図は冷却水逆
止弁の他の実施例を示す縦断面図、第４図は従来の制御
棒駆動水圧装置の系統構成の一例を示す図、第５図は第
４図の従来例に用いられている冷却水逆止弁の一例を示
す図である。 ６……CRD、８……駆動ピストン、10……挿入配管、12
……引抜配管、14……水圧制御ユニット、34……冷却水
配管、37……冷却水逆止弁、38……振動吸収機構付逆止
弁、38A……弁ボディ、38B……チェックボール、38D…
…振動吸収ケージ、38E……振動吸収体、40……冷却水
流量調整機構（オリフィス）、42……冷却水供給ライ
ン、44……冷却水ヘッダ。1 is a diagram showing a system configuration of an embodiment of a control rod water pressure device according to the present invention, and FIG. 2 is a longitudinal sectional view showing a configuration of an example of a cooling water check valve used in the embodiment of FIG. FIG. 3 is a longitudinal sectional view showing another embodiment of the cooling water check valve, FIG. 4 is a view showing an example of a system configuration of a conventional control rod drive water pressure device, and FIG. 5 is a conventional example of FIG. It is a figure which shows an example of the cooling water check valve used. 6 …… CRD, 8 …… Drive piston, 10 …… Insertion pipe, 12
...... Pulling out piping, 14 …… Water pressure control unit, 34 …… Cooling water piping, 37 …… Cooling water check valve, 38 …… Check valve with vibration absorbing mechanism, 38A …… Valve body, 38B …… Check ball , 38D ...
… Vibration absorber cage, 38E …… Vibration absorber, 40 …… Cooling water flow rate adjusting mechanism (orifice), 42 …… Cooling water supply line, 44 …… Cooling water header.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 間瀬 矩章 日立市幸町３丁目１番１号 株式会社日 立製作所日立工場内 (56)参考文献 実開 昭60−185299（ＪＰ，Ｕ) 実開 昭57−98370（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriaki Mase 3-1-1 Sachimachi, Hitachi, Ltd. Inside the Hitachi factory, Hitachi Co., Ltd. (56) References Kai 57-98370 (JP, U)
Claims (4)
・引抜駆動用の冷却水を供給する水圧制御ユニットへの
前記冷却水の供給ラインにチェックボール内蔵型冷却水
逆止弁を備えた制御棒駆動水圧装置において、 前記チェックボール内蔵型冷却水逆止弁が、前記供給ラ
インに連通する孔を側面に有し前記チェックボールを収
納する振動吸収ケージを含むチェックボールの振動吸収
機構を備えたことを特徴とする制御棒駆動水圧装置。1. A check water built-in cooling water check valve is provided in a cooling water supply line to a water pressure control unit that supplies cooling water for cooling and control rod insertion / withdrawal driving to a control rod drive mechanism. In the control rod drive water pressure device, the check water built-in type cooling water check valve includes a vibration absorbing mechanism of a check ball including a vibration absorbing cage having a hole communicating with the supply line on a side surface and storing the check ball. A control rod drive hydraulic device characterized in that
たことを特徴とする制御棒駆動水圧装置。2. The control rod drive hydraulic device according to claim 1, wherein a plurality of the communication holes are formed on a side surface of the vibration absorbing cage.
て、 前記振動吸収機構が、前記チェックボールを収納する振
動吸収ケージと、前記逆止弁本体と前記振動吸収ケージ
との間に配置した振動吸収体とからなることを特徴とす
る制御棒駆動水圧装置。3. The vibration absorbing mechanism according to claim 1 or 2, wherein the vibration absorbing mechanism is arranged between the vibration absorbing cage storing the check ball and the check valve body and the vibration absorbing cage. A control rod drive water pressure device comprising:
れか一項において、 前記振動吸収機構が、前記振動吸収ケージの前記冷却水
流入側端面に冷却水供給流量調整オリフィスを備えたこ
とを特徴とする制御棒駆動水圧装置。4. The vibration absorbing mechanism according to any one of claims 1 to 3, wherein the vibration absorbing mechanism includes a cooling water supply flow rate adjusting orifice at an end surface of the vibration absorbing cage on the cooling water inflow side. A control rod drive hydraulic device characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62146059A JP2505808B2 (en) | 1987-06-11 | 1987-06-11 | Control rod drive hydraulic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62146059A JP2505808B2 (en) | 1987-06-11 | 1987-06-11 | Control rod drive hydraulic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63309891A JPS63309891A (en) | 1988-12-16 |
| JP2505808B2 true JP2505808B2 (en) | 1996-06-12 |
Family
ID=15399153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62146059A Expired - Lifetime JP2505808B2 (en) | 1987-06-11 | 1987-06-11 | Control rod drive hydraulic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2505808B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2804181B2 (en) * | 1991-02-21 | 1998-09-24 | 株式会社東芝 | Control rod drive |
| US5327930A (en) * | 1992-11-06 | 1994-07-12 | Gulf States Utilities Company | Nuclear reactor locking piston drive system and valve assembly |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5798370U (en) * | 1980-12-10 | 1982-06-17 | ||
| JPS60185299U (en) * | 1984-05-21 | 1985-12-09 | 株式会社東芝 | Check valve for cooling water in control rod drive hydraulic system |
-
1987
- 1987-06-11 JP JP62146059A patent/JP2505808B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63309891A (en) | 1988-12-16 |
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