JPH08226984A - Circulation warm-up device for control rod drive system and its warm-up control method - Google Patents
Circulation warm-up device for control rod drive system and its warm-up control methodInfo
- Publication number
- JPH08226984A JPH08226984A JP7033207A JP3320795A JPH08226984A JP H08226984 A JPH08226984 A JP H08226984A JP 7033207 A JP7033207 A JP 7033207A JP 3320795 A JP3320795 A JP 3320795A JP H08226984 A JPH08226984 A JP H08226984A
- Authority
- JP
- Japan
- Prior art keywords
- control rod
- water source
- rod drive
- drive system
- circulation
- 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.)
- Granted
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
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は原子力発電プラントの制
御棒駆動系の循環昇温装置及び昇温制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating heating apparatus and a heating control method for a control rod drive system of a nuclear power plant.
【０００２】[0002]
【従来の技術】一般に、原子力発電プラントには、原子
炉の出力調整や緊急停止の目的で原子炉内に制御棒を挿
入・引抜しており、この制御棒は制御棒駆動系（以下Ｃ
ＲＤ系という）によって操作されている。2. Description of the Related Art Generally, in a nuclear power plant, a control rod is inserted into / removed from the reactor for the purpose of adjusting the output of the nuclear reactor or for an emergency stop.
RD system).
【０００３】このＣＲＤ系について図５を参照して説明
する。ＣＲＤ系は、原子炉の出力調整を行うための制御
棒の位置調整を行うための系統であり、ＣＲＤポンプ
２、水圧制御ユニット９、制御棒駆動機構１３等から構
成される。This CRD system will be described with reference to FIG. The CRD system is a system for adjusting the position of the control rod for adjusting the output of the nuclear reactor, and includes a CRD pump 2, a water pressure control unit 9, a control rod drive mechanism 13, and the like.
【０００４】このＣＲＤ系においては、通常運転中、制
御棒駆動機構１３が制御棒（図示せず）を駆動して原子
炉の出力を調整するが、制御棒駆動機構１３内部には原
子炉圧力容器１４内の炉水が制御棒駆動機構１３外に漏
洩しないように、シール材（図示せず）が設けられてい
る。そしてこのシール材の熱に対する保護のため、通常
運転時にはＣＲＤ系によって制御棒駆動機構１３に冷却
水が供給されており、冷却水は制御棒駆動機構１３内で
除熱した後、原子炉圧力容器１４内に注入される。この
冷却水の温度は、シール材の保護、原子炉圧力容器１４
内に注入されることから炉水との温度差による原子炉圧
力容器１４の熱疲労防止、あるいは原子炉格納容器１０
内に存在する冷却水の供給配管１５の表面における結露
防止等の条件を満たす温度として約４０℃に制御される
必要がある。In this CRD system, during normal operation, the control rod drive mechanism 13 drives a control rod (not shown) to adjust the output of the reactor. A sealant (not shown) is provided to prevent the reactor water in the container 14 from leaking out of the control rod drive mechanism 13. In order to protect the sealing material against heat, cooling water is supplied to the control rod drive mechanism 13 by the CRD system during normal operation. After cooling water is removed from heat in the control rod drive mechanism 13, the reactor pressure vessel is cooled. Injected into 14. The temperature of this cooling water depends on the protection of the sealing material, the reactor pressure vessel 14
Since it is injected into the reactor, thermal fatigue of the reactor pressure vessel 14 due to the temperature difference with the reactor water is prevented, or the reactor containment vessel 10
It is necessary to control the temperature to about 40 ° C. as a temperature that satisfies conditions such as dew condensation prevention on the surface of the cooling water supply pipe 15 present therein.
【０００５】冷却水は復水貯蔵槽１等の水源からＣＲＤ
ポンプ２によって水圧制御ユニット９を介して制御棒駆
動機構１３に供給される。このときＣＲＤポンプ２の下
流側に設けられた流量調整弁１１によって、冷却水流量
を制御し、また、圧力調整弁１２によって冷却水圧力を
制御する。The cooling water is CRD from a water source such as the condensate storage tank 1.
It is supplied to the control rod drive mechanism 13 by the pump 2 via the water pressure control unit 9. At this time, the flow rate adjusting valve 11 provided on the downstream side of the CRD pump 2 controls the flow rate of the cooling water, and the pressure adjusting valve 12 controls the pressure of the cooling water.
【０００６】次に、この冷却水の従来の循環水制御シス
テム及び昇温制御方法について、図６を参照して説明す
る。図６において、ＣＲＤ系の通常運転時にはＣＲＤポ
ンプ２により供給される冷却水の一部（以下循環水とい
う）は供給配管１５から分岐する循環配管１６を介して
再びＣＲＤポンプ２の吸い込み側へ供給される。この循
環水はＣＲＤポンプ２の吐出圧力で循環配管１６に流入
し、オリフィス３で減圧した後、加熱器５によって所定
の温度に加熱されＣＲＤポンプ２の吸い込み側へ循環さ
れる。この循環水の流量は絞り弁４によって調整され
る。ただし、循環のみによってもＣＲＤポンプ２からの
入熱等によって循環水の温度は上昇するので、必要な昇
温の程度によっては加熱器５は必ずしも必要ではない。Next, a conventional circulating water control system and a temperature rise control method for this cooling water will be described with reference to FIG. In FIG. 6, during normal operation of the CRD system, part of the cooling water supplied by the CRD pump 2 (hereinafter referred to as “circulation water”) is supplied to the suction side of the CRD pump 2 again via the circulation pipe 16 branched from the supply pipe 15. To be done. The circulating water flows into the circulation pipe 16 at the discharge pressure of the CRD pump 2, is decompressed by the orifice 3, is heated to a predetermined temperature by the heater 5, and is circulated to the suction side of the CRD pump 2. The flow rate of this circulating water is adjusted by the throttle valve 4. However, since the temperature of the circulating water rises due to heat input from the CRD pump 2 or the like only by circulation, the heater 5 is not always necessary depending on the required degree of temperature rise.
【０００７】また、循環水の温度が上昇し、所定の温度
以上になった場合には、温度スイッチ６によって、水源
移送配管１７に設けられた弁７を開放して循環配管１６
を流れる循環水の一部を復水貯蔵槽１へ移送する。この
ように復水貯蔵槽１へ循環水の一部を移送すれば、所定
の温度以上となった循環水のＣＲＤポンプ２の吸い込み
側への流入量が減り、さらに復水貯蔵槽１からは低温の
冷却水が移送された量だけ増量されるので、全体として
の冷却水温度を低下させることができる。When the temperature of the circulating water rises and exceeds a predetermined temperature, the temperature switch 6 opens the valve 7 provided in the water source transfer pipe 17 to open the circulating pipe 16.
A part of the circulating water flowing through is transferred to the condensate storage tank 1. If a part of the circulating water is transferred to the condensate storage tank 1 in this way, the amount of the circulating water that has reached a predetermined temperature or higher to the suction side of the CRD pump 2 is reduced, and further, from the condensate storage tank 1. Since the low-temperature cooling water is increased by the transferred amount, the cooling water temperature as a whole can be lowered.
【０００８】このようにして、供給配管１５に供給され
る冷却水の温度は所定の温度に制御される。図７はＣＲ
Ｄポンプが２系列設けられている場合の従来例であり、
ＣＲＤポンプ２ａ，２ｂの吐出側に逆止弁１８ａ，１８
ｂを設けた後に供給配管１５ａ，１５ｂを合流させ、Ｃ
ＲＤポンプ２ａ，２ｂの内１系統運転時に他の系統への
冷却水の逆流を防止する。そして、供給配管１５ａ，１
５ｂの各々から循環配管１６ａ，１６ｂを分岐点２２
ａ，２２ｂにおいて分岐させ、その分岐点２２ａ，２２
ｂ後の循環配管１６ａ，１６ｂの各々に逆止弁１９ａ，
１９ｂを設けることによって、１系統のＣＲＤポンプの
運転中に他の循環配管に同様に冷却水が逆流しないよう
にしている。循環配管１６ａ，１６ｂは合流後、分岐点
２１にて水源移送配管１７が分岐する。水源移送配管１
７には弁７が、循環配管１６には絞り弁４が図６と同様
に設けられている。２系列のＣＲＤポンプ２ａ，２ｂが
設けられているのは、ＣＲＤポンプ２ａ，２ｂの単一故
障を考慮したものであり、通常は１系列による運転を行
っている。In this way, the temperature of the cooling water supplied to the supply pipe 15 is controlled to a predetermined temperature. Figure 7 shows CR
This is a conventional example in which two D pumps are provided,
Check valves 18a, 18 on the discharge side of the CRD pumps 2a, 2b
After providing b, the supply pipes 15a and 15b are merged, and C
When one of the RD pumps 2a and 2b is operated, the backflow of cooling water to the other system is prevented. And the supply pipes 15a, 1
From each of 5b, connect the circulation pipes 16a and 16b to a branch point 22.
a, 22b, and branch points 22a, 22
The check valves 19a, 19a,
By providing 19b, the cooling water is prevented from flowing backward to other circulation pipes during the operation of the CRD pump of one system. After merging the circulation pipes 16a and 16b, the water source transfer pipe 17 branches at a branch point 21. Water source transfer pipe 1
7 is provided with a valve 7, and the circulation pipe 16 is provided with a throttle valve 4 as in FIG. The fact that two series of CRD pumps 2a and 2b are provided takes into consideration a single failure of the CRD pumps 2a and 2b, and normally one series of operations is performed.
【０００９】[0009]
【発明が解決しようとする課題】上述の従来のＣＲＤ系
の循環水昇温システム及び昇温制御方法においては、循
環配管１６の循環水流量を絞り弁４によって調整する
が、そのときの調整範囲は、上流側のオリフィス３の製
作誤差（通常２０〜４０ｋｇ／ｃｍ2 ）を補う必要があ
り、実際の絞り弁４の使用状態は約３０ｋｇ／ｃｍ2 程
度の高い差圧がかかる状態となる可能性があった。とこ
ろが、そのような場合には、絞り弁４における圧力回復
係数（＝弁差圧÷（入口側絶対圧力−飽和水蒸気圧））
が０．６５以上となってしまう可能性があった。この圧
力回復係数は一般的には０．６５以下が好ましく、これ
以上の値ではキャビテーションが発生するという欠点を
有する。なお、キャビテーションは、弁の弁体直後で流
体の局所静圧が飽和水蒸気圧より低下し、蒸気泡を発生
する現象であり、エロージョンの原因ともなる。In the above-described conventional circulating water temperature raising system and temperature raising control method of the CRD system, the circulating water flow rate of the circulating pipe 16 is adjusted by the throttle valve 4, but the adjustment range at that time is adjusted. Is required to compensate for the manufacturing error of the orifice 3 on the upstream side (usually 20 to 40 kg / cm 2 ), and the actual use state of the throttle valve 4 can be a state where a high differential pressure of about 30 kg / cm 2 is applied. There was a nature. However, in such a case, the pressure recovery coefficient in the throttle valve 4 (= valve differential pressure / (absolute pressure on inlet side-saturated steam pressure))
Was likely to be 0.65 or more. Generally, the pressure recovery coefficient is preferably 0.65 or less, and if it is more than this value, cavitation occurs. Cavitation is a phenomenon in which the local static pressure of the fluid is lower than the saturated steam pressure immediately after the valve body of the valve to generate vapor bubbles, which also causes erosion.
【００１０】ここで、図８に図６に示されるＣＲＤポン
プ２の吸い込み側からオリフィス３及び絞り弁４を介し
て再びＣＲＤポンプ２の吸い込み側に戻る循環配管１６
内の圧力分布を示す。図８において、Ｐ１はＣＲＤポン
プ２の入り口圧力、Ｐ２はオリフィス３の出口圧力、Ｐ
３はＣＲＤポンプ２の出口圧力、Ｐｖは飽和水蒸気圧
力、Ｐｖｃは絞り弁４内の最低圧力（局所静圧）を示
す。ＣＲＤポンプ２の吸い込み側でＰ１だった圧力は、
吐出側ではＣＲＤポンプ２によってＰ３まで昇圧され、
オリフィス３によってＰ２まで減圧される。しかし、こ
のＰ２は前述のとおり、オリフィス３の製作精度によっ
て、変動する値である。図８においては、オリフィス３
の製作精度がよい場合を示しており、オリフィス３によ
って十分に減圧されているため、図中ａで示される絞り
弁４の弁差圧（Ｐ２−Ｐ１）は図中ｂで示される（入口
側絶対圧力−飽和水蒸気圧）に対して０．６５以上とな
っている。従って、キャビテーションが発生する可能性
が高い。Here, the circulation pipe 16 is returned from the suction side of the CRD pump 2 shown in FIG. 8 to the suction side of the CRD pump 2 again via the orifice 3 and the throttle valve 4.
The pressure distribution inside is shown. In FIG. 8, P1 is the inlet pressure of the CRD pump 2, P2 is the outlet pressure of the orifice 3, and P2 is
3 is the outlet pressure of the CRD pump 2, Pv is the saturated steam pressure, and Pvc is the minimum pressure (local static pressure) in the throttle valve 4. The pressure that was P1 on the suction side of CRD pump 2
On the discharge side, the CRD pump 2 boosts the pressure to P3,
The pressure is reduced to P2 by the orifice 3. However, this P2 is a value that varies depending on the manufacturing accuracy of the orifice 3, as described above. In FIG. 8, the orifice 3
Shows a case where the manufacturing accuracy is good and the pressure is sufficiently reduced by the orifice 3. Therefore, the valve differential pressure (P2-P1) of the throttle valve 4 shown by a in the figure is shown by b in the figure (inlet side). It is 0.65 or more relative to (absolute pressure-saturated water vapor pressure). Therefore, cavitation is likely to occur.
【００１１】よって、絞り弁４においてキャビテーショ
ンの発生を防止するためにはオリフィス３において圧力
損失を大きくとる必要がある。一方、循環配管１６内の
循環水の温度が所定の温度まで上昇して弁７を開放して
水源移送配管１７への循環水の移送を行う場合について
考える。この場合、絞り弁４の差圧は、前述のとおり２
０〜４０ｋｇ／ｃｍ2 程度の範囲でオリフィス３の製作
精度によって変化する。従って、オリフィス３の圧力損
失が大きい場合には、絞り弁４の差圧は低くして使用で
き、上述のとおりキャビテーションの発生という点では
好ましいが、この場合には循環配管１６の分岐点２１か
らの圧力損失が、水源移送配管１７の圧力損失に比べ小
さくなり、水源移送配管１７への循環水流量が少なくな
るので必要移送流量を確保できない可能性があった。Therefore, in order to prevent the occurrence of cavitation in the throttle valve 4, it is necessary to make a large pressure loss in the orifice 3. On the other hand, consider a case where the temperature of the circulating water in the circulating pipe 16 rises to a predetermined temperature and the valve 7 is opened to transfer the circulating water to the water source transfer pipe 17. In this case, the differential pressure of the throttle valve 4 is 2 as described above.
It varies depending on the manufacturing accuracy of the orifice 3 within a range of 0 to 40 kg / cm 2 . Therefore, when the pressure loss of the orifice 3 is large, the differential pressure of the throttle valve 4 can be used with a low pressure, which is preferable in terms of the occurrence of cavitation as described above, but in this case, from the branch point 21 of the circulation pipe 16. Since the pressure loss of 1 is smaller than the pressure loss of the water source transfer pipe 17, and the circulating water flow rate to the water source transfer pipe 17 is small, there is a possibility that the required transfer flow rate cannot be secured.
【００１２】本発明は係る従来の事情に対処してなされ
たものであり、その目的は、キャビテーションの発生を
防止し、また、水源移送配管への移送流量を確保して制
御棒駆動系の循環昇温装置の保守性、運転性及び信頼性
を向上させることにある。The present invention has been made in view of the conventional circumstances, and an object thereof is to prevent the occurrence of cavitation and to secure a transfer flow rate to a water source transfer pipe to circulate a control rod drive system. It is to improve the maintainability, operability, and reliability of the temperature raising device.
【００１３】[0013]
【課題を解決するための手段】上記目的を達成するた
め、本発明の制御棒駆動系の循環昇温装置と昇温制御方
法においては、請求項１記載の発明では、原子炉出力を
制御する制御棒を挿入・引抜する制御棒駆動機構に必要
な冷却水を水源に接続されて供給する供給配管と、この
供給配管の途中に設けられ前記冷却水を昇圧する制御棒
駆動系ポンプと、前記供給配管の制御棒駆動系ポンプの
下流側から分岐され制御棒駆動系ポンプの上流側の供給
配管に接続される循環配管と、前記制御棒駆動系ポンプ
によって昇圧される流体の圧力を減圧する第１の圧力損
失要素と、前記流体の流量を調節する絞り弁と、前記循
環配管から分岐され前記水源に接続される水源移送配管
と、この水源移送配管に設けられた弁とを有する制御棒
駆動系の循環昇温装置において、前記絞り弁を前記第１
の圧力損失要素の上流に設け、前記水源移送配管との分
岐点より下流側の循環配管に第２の圧力損失要素を設け
ている。In order to achieve the above object, in the circulation rod temperature raising apparatus and the temperature raising control method for the control rod drive system of the present invention, the invention of claim 1 controls the reactor output. A supply pipe connected to a water source to supply cooling water required for a control rod drive mechanism for inserting / pulling out a control rod, a control rod drive system pump provided in the middle of this supply pipe for boosting the cooling water, and A circulation pipe branched from a downstream side of the control rod drive system pump of the supply pipe and connected to a supply pipe upstream of the control rod drive system pump; and a pressure reducing unit for reducing the pressure of the fluid boosted by the control rod drive system pump. Control rod drive having a pressure loss element No. 1, a throttle valve for adjusting the flow rate of the fluid, a water source transfer pipe branched from the circulation pipe and connected to the water source, and a valve provided in the water source transfer pipe Circulation heating system In the said throttle valve first
The second pressure loss element is provided upstream of the pressure loss element and the second pressure loss element is provided in the circulation pipe downstream from the branch point with the water source transfer pipe.
【００１４】また、請求項２記載の発明は、請求項１記
載の制御棒駆動系の循環昇温装置において第２の圧力損
失要素を、前記水源移送配管との分岐点から下流側の循
環配管の圧力損失が、前記水源移送配管に前記冷却水の
昇温防止上必要な流量の供給を可能となるように設定さ
れるものである。According to a second aspect of the present invention, in the circulation rod temperature raising device for a control rod drive system according to the first aspect, the second pressure loss element is provided in the circulation pipe downstream from the branch point with the water source transfer pipe. Is set so that the flow rate necessary for preventing the temperature rise of the cooling water can be supplied to the water source transfer pipe.
【００１５】さらに、請求項３記載の発明では、原子炉
出力を制御する制御棒を挿入・引抜する制御棒駆動機構
に必要な冷却水を水源に接続されて供給する２系統の供
給配管と、この２系統の供給配管の途中に設けられ前記
冷却水を昇圧する２系統の制御棒駆動系ポンプと、前記
供給配管の２系統の制御棒駆動系ポンプの下流側から各
々分岐され制御棒駆動系ポンプの上流側の供給配管に接
続される２系統の循環配管と、前記２系統の制御棒駆動
系ポンプによって昇圧される流体の圧力を減圧する第１
の圧力損失要素と、前記流体の流量を調節する絞り弁
と、前記２系統の循環配管から分岐され前記水源に接続
される水源移送配管と、この水源移送配管に設けられた
弁とを有する制御棒駆動系の循環昇温装置において、前
記第１の圧力損失要素を前記２系統の循環配管の各々に
設け、前記絞り弁を各々設けられた第１の圧力損失要素
の上流側に各々設け、前記水源移送配管との分岐点より
下流側の２系統の循環配管に第２の圧力損失要素を各々
設けるとともに、前記各々分岐される水源移送配管を分
岐点よりも下流側に逆止弁を有してこの逆止弁の下流側
で合流するように設けている。Further, in the invention according to claim 3, two systems of supply pipes are connected to the water source to supply the cooling water required for the control rod drive mechanism for inserting and withdrawing the control rod for controlling the reactor output, Two control rod drive system pumps provided in the middle of these two supply pipes for boosting the cooling water, and a control rod drive system branched from the downstream side of the two control rod drive system pumps of the supply pipes. A first system for reducing the pressure of the fluid boosted by the two systems of circulation piping connected to the upstream supply piping of the pump and the two systems of control rod drive system pumps.
A pressure loss element, a throttle valve for adjusting the flow rate of the fluid, a water source transfer pipe branched from the two circulation pipes and connected to the water source, and a valve provided in the water source transfer pipe. In a rod drive system circulation heating device, the first pressure loss element is provided in each of the two systems of circulation piping, and the throttle valve is provided on the upstream side of each provided first pressure loss element, A second pressure loss element is provided in each of the two circulation pipes downstream from the branch point with the water source transfer pipe, and each of the branched water source transfer pipes has a check valve downstream from the branch point. Then, the check valve is provided so as to meet on the downstream side.
【００１６】請求項４記載の発明は、請求項３記載の発
明において、第２の圧力損失要素を、前記水源移送配管
との分岐点から下流側の２系統各々の循環配管の圧力損
失が、前記水源移送配管に前記冷却水の昇温防止上必要
な流量の供給を可能となるように設定されるものであ
る。According to a fourth aspect of the present invention, in the third aspect of the invention, the second pressure loss element is provided with a pressure loss in each of the circulation pipes on the downstream side from the branch point with the water source transfer pipe, The water source transfer pipe is set so as to be able to supply a flow rate necessary for preventing the temperature rise of the cooling water.
【００１７】最後に、請求項５記載の発明では、原子炉
出力を制御する制御棒を挿入・引抜する制御棒駆動機構
に必要な冷却水を水源に接続されて供給する供給配管
と、この供給配管の途中に設けられ前記冷却水を昇圧す
る制御棒駆動系ポンプと、前記供給配管の制御棒駆動系
ポンプの下流側から分岐され制御棒駆動系ポンプの上流
側の供給配管に接続される循環配管と、前記循環配管か
ら分岐され前記水源に接続される水源移送配管とを用い
る冷却水の昇温制御方法において、前記制御棒駆動系ポ
ンプから前記循環配管と水源移送配管との分岐点までの
圧力損失を調整し、この分岐点から前記制御棒駆動系ポ
ンプの吸い込み側までの圧力損失を前記水源移送配管の
圧力損失よりも大きくすることによって水源移送配管へ
冷却水の昇温防止上必要な流量を確保して冷却水の温度
を下げるものである。Finally, in the invention described in claim 5, a supply pipe connected to a water source for supplying cooling water required for a control rod drive mechanism for inserting / pulling out a control rod for controlling a reactor output, and this supply A control rod drive system pump provided in the middle of the pipe for boosting the cooling water, and a circulation connected to a supply pipe upstream of the control rod drive system pump branched from a downstream side of the control rod drive system pump of the supply pipe. In a cooling water temperature raising control method using a pipe and a water source transfer pipe branched from the circulation pipe and connected to the water source, from the control rod drive system pump to a branch point between the circulation pipe and the water source transfer pipe. By adjusting the pressure loss and making the pressure loss from this branch point to the suction side of the control rod drive system pump larger than the pressure loss of the water source transfer pipe, it is possible to prevent the temperature rise of the cooling water to the water source transfer pipe. To ensure the essential flow rate is intended to lower the temperature of the cooling water.
【００１８】[0018]
【作用】上記構成の制御棒駆動系の循環昇温装置におい
ては、絞り弁のキャビテーションを防止可能であり、さ
らに、請求項２及び請求項４記載の発明では循環水を水
源移送配管に移送する場合においても、第１の圧力損失
要素たるオリフィスの製作誤差を考慮しても確実に移送
流量を確保できる。In the circulation rod temperature raising device for the control rod drive system configured as described above, cavitation of the throttle valve can be prevented. Further, in the inventions of claims 2 and 4, the circulating water is transferred to the water source transfer pipe. Even in this case, the transfer flow rate can be reliably ensured even in consideration of the manufacturing error of the orifice which is the first pressure loss element.
【００１９】[0019]
【実施例】以下に本発明に係る制御棒駆動系の循環昇温
装置の第１の実施例を図１に基づき説明する。図１にお
いて、図４と構成が同一のものについては同一の符号を
付し、その構成の説明は省略する。図１において供給配
管１５に供給される冷却水は、その一部を循環水として
循環配管１６に導かれる。この循環水は、まず絞り弁４
によって所定の流量に調節される。その後、水源移送配
管１７との分岐点２１前に設けられたオリフィス３によ
って減圧され、さらに分岐点２１後、別のオリフィス８
によって減圧される。このオリフィス８は予め水源移送
配管１７の圧力損失分を考慮して設計されており、分岐
点２１以下の圧力損失は循環水の移送時において水源移
送配管１７側の圧力損失が過大にならないように設定さ
れている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a circulating rod temperature raising system for a control rod drive system according to the present invention will be described below with reference to FIG. In FIG. 1, the same components as those in FIG. 4 are designated by the same reference numerals, and the description of the components will be omitted. In FIG. 1, a part of the cooling water supplied to the supply pipe 15 is guided to the circulation pipe 16 as circulating water. The circulating water is first fed to the throttle valve 4
Is adjusted to a predetermined flow rate. After that, the pressure is reduced by the orifice 3 provided before the branch point 21 with the water source transfer pipe 17, and after the branch point 21, another orifice 8 is provided.
Decompressed by. The orifice 8 is designed in advance in consideration of the pressure loss of the water source transfer pipe 17, so that the pressure loss at the branch point 21 and below does not cause an excessive pressure loss on the water source transfer pipe 17 side when the circulating water is transferred. It is set.
【００２０】次に、本発明に係る制御棒駆動系の循環昇
温装置の第２の実施例について図２を用いて説明する。
図２は、ＣＲＤポンプ２が２系列設けられている場合の
実施例であり、ＣＲＤポンプ２ａ，２ｂの吐出側に逆止
弁１８ａ，１８ｂを設けた後に供給配管１５ａ，１５ｂ
を合流させ、ＣＲＤポンプ２ａ，２ｂの内１系統運転時
に他の系統への冷却水の逆流を防止する。そして、供給
配管１５ａ，１５ｂの各々から循環配管１６ａ，１６ｂ
を分岐点２２ａ，２２ｂにおいて分岐させ、その分岐点
２２ａ，２２ｂ後の循環配管１６ａ，１６ｂの各々に逆
止弁１９ａ，１９ｂを設けることによって、１系統のＣ
ＲＤポンプの運転中に他の循環配管に同様に冷却水が逆
流しないようにしている。Next, a second embodiment of the circulating rod temperature raising system for the control rod drive system according to the present invention will be described with reference to FIG.
FIG. 2 shows an embodiment in which two series of CRD pumps 2 are provided, and supply pipes 15a, 15b are provided after check valves 18a, 18b are provided on the discharge side of CRD pumps 2a, 2b.
Of the CRD pumps 2a and 2b to prevent the reverse flow of the cooling water to the other system. The circulation pipes 16a and 16b are connected to the supply pipes 15a and 15b, respectively.
Is branched at branch points 22a and 22b, and check valves 19a and 19b are provided on the circulation pipes 16a and 16b after the branch points 22a and 22b, respectively.
Similarly, the cooling water is prevented from flowing backward to the other circulation pipes while the RD pump is operating.
【００２１】また、これらの循環配管１６ａ，１６ｂに
はそれぞれ絞り弁４ａ，４ｂ及びオリフィス３ａ，３ｂ
が設けられ、その後合流して分岐点２１にて水源移送配
管１７と分岐する。Further, these circulation pipes 16a and 16b are respectively provided with throttle valves 4a and 4b and orifices 3a and 3b.
Is provided, and then merges and branches at the branch point 21 with the water source transfer pipe 17.
【００２２】さらに、循環配管１６には第１の実施例と
同様にオリフィス８が設けられている。このように構成
された第１の実施例及び第２の実施例の制御棒駆動系の
循環昇温装置においては、絞り弁４，４ａ，４ｂがオリ
フィス３，３ａ，３ｂの上流に設けられているため、絞
り弁４，４ａ，４ｂの入口圧力はＣＲＤポンプ２，２
ａ，２ｂの吐出圧力となり圧力回復係数の改善を図るこ
とができる。従って、絞り弁４，４ａ，４ｂでキャビテ
ーションの発生を抑制することが可能である。Further, the circulation pipe 16 is provided with the orifice 8 as in the first embodiment. In the circulation rod temperature raising device for the control rod drive system of the first and second embodiments configured as described above, the throttle valves 4, 4a, 4b are provided upstream of the orifices 3, 3a, 3b. Therefore, the inlet pressures of the throttle valves 4, 4a, 4b are CRD pumps 2, 2
The discharge pressures of a and 2b are obtained, and the pressure recovery coefficient can be improved. Therefore, it is possible to suppress the occurrence of cavitation with the throttle valves 4, 4a, 4b.
【００２３】ここで、絞り弁４，４ａ，４ｂでキャビテ
ーションの発生を抑制できることを図４を参照して説明
する。図４は図１あるいは図２に示されるＣＲＤポンプ
２，２ａ，２ｂの吸い込み側から絞り弁４，４ａ，４
ｂ、オリフィス３，３ａ，３ｂ、オリフィス８を介して
再びＣＲＤポンプ２，２ａ，２ｂの吸い込み側に戻る循
環配管１６内の圧力分布を示す。図４において、Ｐ４は
絞り弁４，４ａ，４ｂの出口圧力を示す。また、その他
の符号の圧力については図８と同一の圧力を示すので説
明は省略する。Here, it will be described with reference to FIG. 4 that the occurrence of cavitation can be suppressed by the throttle valves 4, 4a, 4b. FIG. 4 shows the throttle valves 4, 4a, 4 from the suction side of the CRD pumps 2, 2a, 2b shown in FIG. 1 or 2.
The pressure distribution in the circulation pipe 16 returning to the suction side of the CRD pumps 2, 2a, 2b again via b, the orifices 3, 3a, 3b, and the orifice 8 is shown. In FIG. 4, P4 indicates the outlet pressure of the throttle valves 4, 4a, 4b. Further, pressures indicated by other reference numerals are the same as those in FIG. 8, and thus description thereof will be omitted.
【００２４】図４において、ＣＲＤポンプ２，２ａ，２
ｂの吸い込み側でＰ１だった圧力は、吐出側ではＣＲＤ
ポンプ２，２ａ，２ｂによってＰ３まで昇圧され、高圧
のまま絞り弁４，４ａ，４ｂによってＰ４まで減圧され
る。その後、オリフィス３によってＰ２まで減圧され、
さらにオリフィス８，８ａ，８ｂによってＰ１まで減圧
される。In FIG. 4, CRD pumps 2, 2a, 2 are shown.
The pressure that was P1 on the suction side of b is CRD on the discharge side.
The pressure is increased to P3 by the pumps 2, 2a and 2b, and reduced to P4 by the throttle valves 4, 4a and 4b while maintaining the high pressure. After that, the pressure is reduced to P2 by the orifice 3,
Further, the pressure is reduced to P1 by the orifices 8, 8a, 8b.
【００２５】オリフィス３，３ａ，３ｂの圧力損失はそ
の製作精度によって左右されるものの、絞り弁４，４
ａ，４ｂをオリフィス３，３ａ，３ｂの上流に設けるこ
とによって圧力回復係数の改善を図ることが可能であ
る。具体的には、図中ａで示される絞り弁４，４ａ，４
ｂの弁差圧（Ｐ３−Ｐ４）は図中ｂで示される〔（入口
側絶対圧力−飽和水蒸気圧）＝（Ｐ３−Ｐｖ）〕に対し
て０．６５以下となっている。従って、キャビテーショ
ンの発生を抑制することが可能である。Although the pressure loss of the orifices 3, 3a, 3b depends on the manufacturing accuracy, the throttle valves 4, 4
By providing a and 4b upstream of the orifices 3, 3a and 3b, it is possible to improve the pressure recovery coefficient. Specifically, the throttle valves 4, 4a, 4 shown by a in the figure
The valve differential pressure (P3-P4) of b is 0.65 or less with respect to [(inlet absolute pressure-saturated steam pressure) = (P3-Pv)] shown by b in the figure. Therefore, it is possible to suppress the occurrence of cavitation.
【００２６】一方、循環水の温度が上昇し、水源移送配
管１７によって循環水の移送を行う場合には、オリフィ
ス８，８ａ，８ｂによって分岐点２１より下流の循環配
管１６と水源移送配管１７の流量バランスが保たれるた
め水源移送配管１７の流量が小さくなることはない。す
なわち、たとえオリフィス３，３ａ，３ｂの製作精度が
悪く、オリフィス３，３ａ，３ｂにおける圧力損失が大
きくとも、水源移送配管１７の圧力損失よりも循環配管
１６の圧力損失が大きくなるように固定されたオリフィ
ス８，８ａ，８ｂを有しているので流量バランスを維持
することが可能である。また、水源移送配管１７に流入
する循環水の微量調整は絞り弁４，４ａ，４ｂによって
行うことができる。この微量調整はオリフィス８，８
ａ，８ｂによっては吸収できない微量の調整や循環水の
温度上昇の程度によって生じる移送流量の調整を意味す
る。このような微量調整を行っても分岐点２１より下流
側では、それぞれの配管の圧力損失のバランスは一定で
あり、水源移送配管１７に流入する循環水の流量が循環
配管１６に比べて減少することはない。On the other hand, when the circulating water temperature rises and the circulating water is transferred by the water source transfer pipe 17, the circulation pipe 16 and the water source transfer pipe 17 downstream of the branch point 21 are moved by the orifices 8, 8a, 8b. Since the flow rate balance is maintained, the flow rate of the water source transfer pipe 17 does not decrease. That is, even if the manufacturing accuracy of the orifices 3, 3a, 3b is poor and the pressure loss in the orifices 3, 3a, 3b is large, the pressure loss in the circulation pipe 16 is fixed so as to be larger than the pressure loss in the water source transfer pipe 17. Since it has the orifices 8, 8a, 8b, it is possible to maintain the flow rate balance. Further, the minute adjustment of the circulating water flowing into the water source transfer pipe 17 can be performed by the throttle valves 4, 4a, 4b. This fine adjustment is done with orifices 8 and 8
It means the adjustment of a very small amount that cannot be absorbed by a and 8b and the adjustment of the transfer flow rate caused by the degree of temperature rise of circulating water. Even if such a minute adjustment is performed, the balance of the pressure loss of each pipe is constant on the downstream side of the branch point 21, and the flow rate of the circulating water flowing into the water source transfer pipe 17 is smaller than that of the circulating pipe 16. There is no such thing.
【００２７】従って、このような制御棒駆動系の循環昇
温装置の第１及び第２の実施例によれば、オリフィス
３，３ａ，３ｂの製作精度による圧力損失の変動に対し
て、絞り弁４，４ａ，４ｂにおけるキャビテーションの
発生を防止可能であると同時に、循環水の移送時におい
ても昇温防止上必要な流量を確保することができる。Therefore, according to the first and second embodiments of the circulating temperature raising device for the control rod drive system, the throttle valve is adapted to the fluctuation of the pressure loss due to the manufacturing accuracy of the orifices 3, 3a and 3b. It is possible to prevent the occurrence of cavitation in 4, 4a and 4b, and at the same time, to secure the flow rate necessary for preventing the temperature rise even when the circulating water is transferred.
【００２８】次に本発明に係る制御棒駆動系の循環昇温
装置の第３の実施例について図３を用いて説明する。図
３においては、ＣＲＤポンプの２系列による並列運転時
でもそれぞれのＣＲＤポンプの保護上必要な流量を確保
することができるものである。Next, a third embodiment of the circulating rod temperature raising system for the control rod drive system according to the present invention will be described with reference to FIG. In FIG. 3, the flow rate required for protection of each CRD pump can be ensured even when two CRD pumps are operated in parallel.
【００２９】ＣＲＤポンプ２ａ，２ｂの吐出側の逆止弁
１８ａ，１８ｂの上流側にそれぞれ循環配管１６ａ，１
６ｂを分岐させて設けている。この循環配管１６ａ，１
６ｂには、それぞれ第２の実施例の構成と同様に、逆止
弁１９ａ，１９ｂ、絞り弁４ａ，４ｂ、オリフィス３
ａ，３ｂが設けられている。ただし、それぞれの循環配
管１６ａ，１６ｂにオリフィス８ａ，８ｂが設けられ、
その下流側で循環配管１６ａ，１６ｂが合流している。
また、オリフィス３ａ，３ｂとオリフィス８ａ，８ｂの
間で、水源移送配管１７ａ，１７ｂがそれぞれ分岐し、
逆止弁２０ａ，２０ｂを介して水源移送配管１７として
合流している。水源移送配管１７には弁７が設けられて
いる。Circulation pipes 16a, 1 are provided upstream of the check valves 18a, 18b on the discharge side of the CRD pumps 2a, 2b, respectively.
6b is provided in a branched manner. This circulation piping 16a, 1
The check valves 6a and 19b, the throttle valves 4a and 4b, and the orifice 3 are provided at 6b, respectively, similarly to the configuration of the second embodiment.
a and 3b are provided. However, the orifices 8a and 8b are provided in the respective circulation pipes 16a and 16b,
The circulation pipes 16a and 16b join together on the downstream side.
Further, the water source transfer pipes 17a and 17b branch between the orifices 3a and 3b and the orifices 8a and 8b, respectively,
The water source transfer pipes 17 are joined together via the check valves 20a and 20b. The water source transfer pipe 17 is provided with a valve 7.
【００３０】このような第３の実施例の構成において
は、ＣＲＤポンプの万一の並列運転の場合におけるそれ
ぞれの循環配管１６ａ，１６ｂを流れる循環水流量は１
系列運転時の流量とほぼ同じである。これは、流量が圧
力バランスによって決定されるものであるからであり、
従って、循環水の流量としては、１系列の通常運転時の
２倍となる。第２の実施例のような構成であれば、２倍
の循環水流量は単一のオリフィス８を通過することにな
るのでオリフィス８における圧力損失は４倍となってし
まう。実際には、この圧力損失による影響で循環配管１
６全体の圧力損失が増えるので流量は減少してバランス
するが、それでも実施例２ではオリフィス８における圧
力損失が過大となってしまう可能性がある。従って、Ｃ
ＲＤポンプ２ａ，２ｂにそれぞれ最小限必要とされる流
量を循環配管１６に確保できない可能性がある。In the structure of the third embodiment, the flow rate of the circulating water flowing through the circulating pipes 16a and 16b is 1 in case of parallel operation of the CRD pumps.
It is almost the same as the flow rate during series operation. This is because the flow rate is determined by the pressure balance,
Therefore, the flow rate of the circulating water is double that of one series of normal operation. In the case of the configuration of the second embodiment, the double circulating water flow rate passes through the single orifice 8, so the pressure loss at the orifice 8 becomes four times. Actually, the circulation pipe 1 is affected by this pressure loss.
Since the pressure loss of 6 as a whole increases, the flow rate decreases and balances. However, in the second embodiment, the pressure loss at the orifice 8 may be excessive. Therefore, C
There is a possibility that the circulation pipe 16 cannot have the minimum required flow rate for the RD pumps 2a and 2b.
【００３１】しかし、第３の実施例のようにオリフィス
８ａ，８ｂを並列に設けておくと各々の流量に対して減
圧するのでそのような不都合はない。オリフィス８ａ，
８ｂの下流側では合流するが、循環配管１６における圧
力損失はほとんど絞り弁４ａ，４ｂ、オリフィス３ａ，
３ｂ、オリフィス８ａ，８ｂによって生じるため合流後
に流量が通常運転時の２倍となっても全体としての圧力
損失にはほとんど影響はなくＣＲＤポンプ２ａ，２ｂに
ポンプの保護上必要な流量は確保される。However, if the orifices 8a and 8b are provided in parallel as in the third embodiment, the pressure is reduced with respect to each flow rate, so that there is no such inconvenience. Orifice 8a,
Although they merge at the downstream side of 8b, most of the pressure loss in the circulation pipe 16 is caused by the throttle valves 4a, 4b, the orifice 3a,
3B and the orifices 8a and 8b, even if the flow rate after merging doubles that in normal operation, it has almost no effect on the pressure loss as a whole and the CRD pumps 2a and 2b have the flow rate necessary for protecting the pumps. It
【００３２】また、絞り弁の圧力回復係数は第２の実施
例と同様に小さく抑えられ、絞り弁４ａ，４ｂのキャビ
テーションが防止され、弁のエロージョンの防止も可能
となる。Further, the pressure recovery coefficient of the throttle valve is suppressed to be small as in the second embodiment, cavitation of the throttle valves 4a and 4b is prevented, and erosion of the valve can be prevented.
【００３３】なお、逆止弁２０ａ，２０ｂはＣＲＤポン
プ２ａ，２ｂの並列運転時のために設けられたものでは
なく、通常の１系列運転時に循環水が両方のオリフィス
８ａ，８ｂに分散されないために設けられたものであ
る。すなわち、循環水がオリフィス８ａ，８ｂに分散さ
れると１系列分の循環流量の半分の流量がそれぞれのオ
リフィス８ａ，８ｂに流入し、圧力損失は流量の２分の
１で効くので４分の１となってしまい、これでは循環配
管１６ａ，１６ｂ全体の圧力損失が下がってしまう。循
環配管１６ａ，１６ｂ全体の圧力損失が低下すると水源
移送配管１７の圧力損失とのバランスの関係で、昇温防
止のための水源移送配管１７への循環水移送が十分にで
きない可能性があるからである。The check valves 20a and 20b are not provided for the parallel operation of the CRD pumps 2a and 2b, and the circulating water is not dispersed to both orifices 8a and 8b during the normal 1-series operation. It was installed in. That is, when the circulating water is dispersed in the orifices 8a and 8b, half the flow rate of the circulation flow for one series flows into the respective orifices 8a and 8b, and the pressure loss is effective at 1/2 of the flow rate, so that it is a quarter However, the pressure loss of the entire circulation pipes 16a and 16b is reduced. If the pressure loss of the entire circulation pipes 16a and 16b decreases, there is a possibility that the circulation water cannot be sufficiently transferred to the water source transfer pipe 17 for preventing the temperature rise due to the balance with the pressure loss of the water source transfer pipe 17. Is.
【００３４】[0034]
【発明の効果】以上説明したように本発明の制御棒駆動
系の循環昇温装置においては、絞り弁の圧力回復係数を
小さく抑え、キャビテーションの発生を抑制することに
よってエロージョンの発生を防止する。また、第１の圧
力損失要素たるオリフィスの製作精度による水源移送流
量への影響を低下させ、循環水の昇温防止上必要な流量
を確実に確保することができる。As described above, in the control rod drive system circulation temperature raising apparatus of the present invention, the erosion is prevented by suppressing the pressure recovery coefficient of the throttle valve and suppressing the cavitation. Further, it is possible to reduce the influence of the manufacturing accuracy of the orifice, which is the first pressure loss element, on the flow rate of the water source transfer, and to reliably secure the flow rate necessary for preventing the temperature rise of the circulating water.
【図１】本発明に係る制御棒駆動系の循環昇温装置の第
１の実施例の系統構成図。FIG. 1 is a system configuration diagram of a first embodiment of a circulating heating apparatus for a control rod drive system according to the present invention.
【図２】本発明に係る制御棒駆動系の循環昇温装置の第
２の実施例の系統構成図。FIG. 2 is a system configuration diagram of a second embodiment of a circulating rod heating system for a control rod drive system according to the present invention.
【図３】本発明に係る制御棒駆動系の循環昇温装置の第
３の実施例の系統構成図。FIG. 3 is a system configuration diagram of a third embodiment of a circulating heating apparatus for a control rod drive system according to the present invention.
【図４】第１の実施例及び第２の実施例における循環配
管内の圧力分布を示す線図。FIG. 4 is a diagram showing the pressure distribution in the circulation pipe in the first and second embodiments.
【図５】制御棒駆動系の構成図。FIG. 5 is a configuration diagram of a control rod drive system.
【図６】制御棒駆動系の循環昇温装置の従来例の系統構
成図。FIG. 6 is a system configuration diagram of a conventional example of a circulating heating device for a control rod drive system.
【図７】制御棒駆動系の循環昇温装置の従来例の系統構
成図。FIG. 7 is a system configuration diagram of a conventional example of a circulation heating device for a control rod drive system.
【図８】従来例における循環配管内の圧力分布を示す線
図。FIG. 8 is a diagram showing a pressure distribution in a circulation pipe in a conventional example.
１…復水貯蔵槽 ２，２ａ，２ｂ…ＣＲ
Ｄポンプ ３，３ａ，３ｂ…オリフィス ４，４ａ，４ｂ…絞り
弁 ５…加熱器 ６…温度スイッチ ７…弁 ８…オリフィス ９…水圧制御ユニット １０…原子炉格納容器 １１…流量調整弁 １２…圧力調整弁 １３…制御棒駆動機構 １４…原子炉圧力容器 １５，１５ａ，１５ｂ…供給配管１６，１６ａ，１６ｂ
…循環配管 １７…水源移送配管 １８ａ，１８ｂ…逆止
弁 １９ａ，１９ｂ…逆止弁 ２０ａ，２０ｂ…逆止
弁 ２１…分岐点 ２２ａ，２２ｂ…分岐
点1 ... Condensate storage tank 2, 2a, 2b ... CR
D pump 3,3a, 3b ... orifice 4,4a, 4b ... throttle valve 5 ... heater 6 ... temperature switch 7 ... valve 8 ... orifice 9 ... water pressure control unit 10 ... reactor containment vessel 11 ... flow rate adjusting valve 12 ... pressure Regulator valve 13 ... Control rod drive mechanism 14 ... Reactor pressure vessel 15, 15a, 15b ... Supply piping 16, 16a, 16b
... Circulation piping 17 ... Water source transfer piping 18a, 18b ... Check valves 19a, 19b ... Check valves 20a, 20b ... Check valves 21 ... Branch points 22a, 22b ... Branch points
Claims (5)
抜する制御棒駆動機構に必要な冷却水を水源に接続され
て供給する供給配管と、この供給配管の途中に設けられ
前記冷却水を昇圧する制御棒駆動系ポンプと、前記供給
配管の制御棒駆動系ポンプの下流側から分岐され制御棒
駆動系ポンプの上流側の供給配管に接続される循環配管
と、前記制御棒駆動系ポンプによって昇圧される流体の
圧力を減圧する第１の圧力損失要素と、前記流体の流量
を調節する絞り弁と、前記循環配管から分岐され前記水
源に接続される水源移送配管と、この水源移送配管に設
けられた弁とを有する制御棒駆動系の循環昇温装置にお
いて、前記絞り弁は前記第１の圧力損失要素の上流に設
けられ、前記水源移送配管との分岐点より下流側の循環
配管に第２の圧力損失要素を設けることを特徴とする制
御棒駆動系の循環昇温装置。1. A supply pipe connected to a water source for supplying cooling water required for a control rod drive mechanism for inserting / pulling out a control rod for controlling a reactor output, and the cooling water provided in the middle of this supply pipe. A control rod drive system pump, a circulation pipe branched from a downstream side of the control rod drive system pump of the supply pipe and connected to a supply pipe upstream of the control rod drive system pump, and the control rod drive system pump A first pressure loss element for reducing the pressure of the fluid boosted by the pressure reducing valve, a throttle valve for adjusting the flow rate of the fluid, a water source transfer pipe branched from the circulation pipe and connected to the water source, and the water source transfer pipe In the circulation rod temperature raising device for a control rod drive system, the throttle valve is provided upstream of the first pressure loss element, and the circulation pipe is located downstream of a branch point with the water source transfer pipe. To the second pressure loss A circulating rod temperature raising device for a control rod drive system, characterized in that a loss element is provided.
送配管との分岐点から下流側の循環配管の圧力損失を、
前記水源移送配管に前記冷却水の昇温防止上必要な流量
の供給を可能とするように設定されることを特徴とする
請求項１記載の制御棒駆動系の循環昇温装置。2. The second pressure loss element measures the pressure loss of the circulation pipe downstream from the branch point with the water source transfer pipe,
2. The circulating temperature raising device for a control rod drive system according to claim 1, wherein the water source transfer pipe is set so as to be able to supply a flow rate necessary for preventing the temperature rise of the cooling water.
抜する制御棒駆動機構に必要な冷却水を水源に接続され
て供給する２系統の供給配管と、この２系統の供給配管
の途中に設けられ前記冷却水を昇圧する２系統の制御棒
駆動系ポンプと、前記供給配管の２系統の制御棒駆動系
ポンプの下流側から各々分岐され制御棒駆動系ポンプの
上流側の供給配管に接続される２系統の循環配管と、前
記２系統の制御棒駆動系ポンプによって昇圧される流体
の圧力を減圧する第１の圧力損失要素と、前記流体の流
量を調節する絞り弁と、前記２系統の循環配管から分岐
され前記水源に接続される水源移送配管と、この水源移
送配管に設けられた弁とを有する制御棒駆動系の循環昇
温装置において、前記第１の圧力損失要素は前記２系統
の循環配管に各々設けられ、前記絞り弁は各々設けられ
た第１の圧力損失要素の上流側に各々設けられ、前記水
源移送配管との分岐点より下流側の２系統の循環配管に
第２の圧力損失要素を各々設けるとともに、前記各々分
岐される水源移送配管は分岐点よりも下流側に逆止弁を
有してこの逆止弁の下流側で合流するように設けられた
ことを特徴とする制御棒駆動系の循環昇温装置。3. A two-system supply pipe for supplying cooling water required for a control-rod drive mechanism for inserting and withdrawing a control rod for controlling a reactor output to a water source, and a middle of these two-system supply pipes. And a control rod drive system pump for boosting the cooling water, and a supply pipe upstream of the control rod drive system pump branched from the downstream side of the control pipe drive system pump of the two system of the supply pipe. Two connected circulation pipes, a first pressure loss element for reducing the pressure of the fluid boosted by the two control rod drive system pumps, a throttle valve for adjusting the flow rate of the fluid, and In a circulation heating device of a control rod drive system, which has a water source transfer pipe branched from a system circulation pipe and connected to the water source, and a valve provided in the water source transfer pipe, the first pressure loss element is the Installed in each of the two circulation pipes The throttle valve is provided on the upstream side of each of the first pressure loss elements provided, and the second pressure loss element is provided on the two circulation pipes downstream from the branch point with the water source transfer pipe. A control rod drive characterized in that each of the water source transfer pipes branched from each branch has a check valve on the downstream side of the branch point, and is provided so as to join the downstream side of the check valve. System circulation heating device.
送配管との分岐点から下流側の２系統各々の循環配管の
圧力損失を、前記水源移送配管に前記冷却水の昇温防止
上必要な流量の供給を可能とするように設定されること
を特徴とする請求項３記載の制御棒駆動系の循環昇温装
置。4. The second pressure loss element prevents the pressure loss of the circulation pipe of each of the two systems on the downstream side from the branch point of the water source transfer pipe from flowing in the water source transfer pipe to prevent the temperature rise of the cooling water. The circulating heating apparatus for a control rod drive system according to claim 3, wherein the circulating rod temperature raising apparatus is set so that a required flow rate can be supplied.
抜する制御棒駆動機構に必要な冷却水を水源に接続され
て供給する供給配管と、この供給配管の途中に設けられ
前記冷却水を昇圧する制御棒駆動系ポンプと、前記供給
配管の制御棒駆動系ポンプの下流側から分岐され制御棒
駆動系ポンプの上流側の供給配管に接続される循環配管
と、前記循環配管から分岐され前記水源に接続される水
源移送配管とを用いる冷却水の昇温制御方法において、
前記制御棒駆動系ポンプから前記循環配管と水源移送配
管との分岐点までの圧力損失を調整し、この分岐点から
前記制御棒駆動系ポンプの吸い込み側までの圧力損失を
前記水源移送配管の圧力損失よりも大きくすることによ
って水源移送配管へ冷却水の昇温防止上必要な流量を確
保して冷却水の温度を下げることを特徴とする昇温制御
方法。5. A supply pipe connected to a water source for supplying cooling water required for a control rod drive mechanism for inserting / pulling out a control rod for controlling a reactor output, and the cooling water provided in the middle of this supply pipe. A control rod drive system pump for boosting pressure, a circulation pipe branched from a downstream side of the control rod drive system pump of the supply pipe and connected to a supply pipe upstream of the control rod drive system pump, and a circulation pipe branched from the circulation pipe. In a method of controlling temperature rise of cooling water using a water source transfer pipe connected to the water source,
The pressure loss from the control rod drive system pump to the branch point between the circulation pipe and the water source transfer pipe is adjusted, and the pressure loss from this branch point to the suction side of the control rod drive system pump is adjusted to the pressure of the water source transfer pipe. A temperature raising control method characterized in that a flow rate necessary for preventing a temperature rise of cooling water is secured to a water source transfer pipe by making the loss larger than the loss to lower the temperature of the cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03320795A JP3392563B2 (en) | 1995-02-22 | 1995-02-22 | Circulation heater for control rod drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03320795A JP3392563B2 (en) | 1995-02-22 | 1995-02-22 | Circulation heater for control rod drive system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08226984A true JPH08226984A (en) | 1996-09-03 |
| JP3392563B2 JP3392563B2 (en) | 2003-03-31 |
Family
ID=12380026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03320795A Expired - Fee Related JP3392563B2 (en) | 1995-02-22 | 1995-02-22 | Circulation heater for control rod drive system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3392563B2 (en) |
-
1995
- 1995-02-22 JP JP03320795A patent/JP3392563B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3392563B2 (en) | 2003-03-31 |
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