05000318/LER-1981-003-03, /03L-0:on 810123,shutdown Cooling Return Header Isolation valve,MOV-652,lost Valve Position Indication & Flow Was Stopped.Caused by Motor Control Center Power Transfer.Transfer Completed,Indication & Flow Restored

/03L-0:on 810123,shutdown Cooling Return Header Isolation valve,MOV-652,lost Valve Position Indication & Flow Was Stopped.Caused by Motor Control Center Power Transfer.Transfer Completed,Indication & Flow Restored

ML20003B619
Person / Time
Site:	Calvert Cliffs
Issue date:	02/20/1981
From:	Wenderlich R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20003B618	List: 05000318/LER-1981-003, Forwards LER 81-003/03L-0 05000318/LER-1981-003-03, /03L-0:on 810123,shutdown Cooling Return Header Isolation valve,MOV-652,lost Valve Position Indication & Flow Was Stopped.Caused by Motor Control Center Power Transfer.Transfer Completed,Indication & Flow Restored
References
LER-81-003-03L, LER-81-3-3L, NUDOCS 8102250046
Download: ML20003B619 (2)

LER-1981-003, /03L-0:on 810123,shutdown Cooling Return Header Isolation valve,MOV-652,lost Valve Position Indication & Flow Was Stopped.Caused by Motor Control Center Power Transfer.Transfer Completed,Indication & Flow Restored

Event date:
Report date:
3181981003R03 - NRC Website

text

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N MC F *'1366 U.S. NUCLEAR REGULATORY COMMISSloN LICENSEE EVENT REPORT CONTROL BLOCK: l l

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT 0 ATE do EVENT oESCRIPTioN AND pro 8ABLE CONSEQUENCES h t o 121 l Durino Mode 6 operation shutdown coolino flow was stopoed for 5 minutes.

I iO !ai i Actions were taken as required by T.S. 3.9.8.a.

At 0655 valve oosition i

10: 41I indication was lost for MOV-652, a shutdown coolino return header isola-I io isi i tion valve. Questioning the actual valve oosition, the ooerator stocoed I

Lo_L6J l flow temporarily. At 0700 valve oosition indication and flow were re-i I o I 71 I stored. There was no increase in decay heat load or decrease in RCS l

i O !a i i boron concentration during this non-repetitive event.

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3J 34 35 36 37 40 41 42 43 44 47 CAUSE oESCRIPTloN ANo CORRECTIVE ACTIONS lilo t I The cause of the loss of valve oosition indication for MOV-652 was a MCC I

LL.L'.J l oower transfer. The transfer was over in 5 minutes and valve cositinn I

i, # 21 I indication and shutdown coolino flow were restored. A recent orablem I

i, iai i with PT-103-1 contributed to the decision to stoo flow. This oroblem has I

ii i4i I since been corrected. Licensed oersonnel will be infon11ed of this event.

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LER NO.

81-03/3L DOCKET NO.

50-318 LICENSE NO.

DPR-69 EVENT DATE 01-23-81 REPORT DATE 02-20-81 ATTACHMENT EVENT DESCRIPT;ON AND PROBABLE CONSEQUENCES (CONT'D)

During Mode 6 operation, shutdown cooling flow was stopped for about 5 minutes. Actions were taken as required by T.S. 3.9.8.a. At 0655, due to a motor control center power transfer, valve position indication was lost in the Control Room for MOV-632 (a shutdown cooling return header isolation valve). Due to a recent problem with PT-103-1, the Control Room Operator questioned the actual position of MOV-652. He therefore stopped shutdown cooling flow temporarily to protect MOV-652 and the LPSI pump from possible damage in the event that MOV-652 was fully or partially shut. At 0700, valve position indication was reenergized, and it was i

di, covered that MOV-652 was, in fact, fully open. Sh-*down cooling flow was then restored. During the intervening 5 minutes, no operations were in progress involving an increase in the reactor decay heat load or a reduction in boron concentration of the Reactor Coolant System. Shutdown cooling temperature showed only a slight increase during this time period. This event had no impact on the public health or safety. This is a non-repetitive event.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)

The cause of the loss of valve position indication for MOV-632 was a power trahsfer involving MCC-204 and MCC-214. The power transfer was over in 5 minutes, and valve position Indication and shutdown cooling flow were restored. The operator was aware of the power transfer but did not anticipa> a loss of valve position Indication. Recent problems with PT-103-1 (which closes MOV-652 on high pressure) caused the operator to be especially wary of a possible closure of MOV-632, contributing to the decision to stop the LPSI pump. The problem with PT-103-1 has been since corrected. A caution has been added to the 480V system operating

- instruction to check the applicable load list to determine affected loads before deenergizing a 480V bus or MCC. All licensed personnel will be informed of the details c.f this event.

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