05000317/LER-1981-010-03, /03L-0:on 810123,nipple Broken on Valve CV-5178, Salt Water Emergency Return Isolation from ECCS Pump Room Coolers.Caused by Lead Brick Fall During Const of Lead Shield Wall.Valve Isolated & Nipple Replaced

/03L-0:on 810123,nipple Broken on Valve CV-5178, Salt Water Emergency Return Isolation from ECCS Pump Room Coolers.Caused by Lead Brick Fall During Const of Lead Shield Wall.Valve Isolated & Nipple Replaced

ML20003C080
Person / Time
Site:	Calvert Cliffs
Issue date:	02/20/1981
From:	Rayburn C, Wenderlich R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20003C060	List: 05000317/LER-1981-010, Forwards LER 81-010/03L-0 05000317/LER-1981-010-03, /03L-0:on 810123,nipple Broken on Valve CV-5178, Salt Water Emergency Return Isolation from ECCS Pump Room Coolers.Caused by Lead Brick Fall During Const of Lead Shield Wall.Valve Isolated & Nipple Replaced
References
LER-81-010-03L, LER-81-10-3L, NUDOCS 8102260578
Download: ML20003C080 (2)

LER-1981-010, /03L-0:on 810123,nipple Broken on Valve CV-5178, Salt Water Emergency Return Isolation from ECCS Pump Room Coolers.Caused by Lead Brick Fall During Const of Lead Shield Wall.Valve Isolated & Nipple Replaced

Event date:
Report date:
3171981010R03 - NRC Website

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U. S. NUCLEAR REGULATORY COMMISSION NRC MRM 366 (7-77)

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60 61 OOCKET NUMSER 6d 69 EV ENT DATE 74 75 REPORT DATE 40 EVENT DESCRIPTION AND PRCBA8LE CONSEQUENCES h 1o : 21 1 During power operation, broke a nicole on valve CV-5178, salt water emer-l io i3i i gency return isolation from ECCS pump room coolers.

Isolation and repair 1

resulted in temocrary loss of redundancy in salt water, service water, I

io ni i io isi I and component cooling systems per T.S. 3.7.3.1, 3.7.4.1, and 3.7.5.1.

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DPR-53 EVENT DATE 01-23-31 REPORT DATE 02-20-81 ATTACHMENT EVEN1 DESCRIPTION AND PR1BABLE COP 3EQUENCES (CONTD) l During power operation at 2230, broke a nipple on valve 1-CV-5178, saltwater emergency return isolation from No.11 and 12 ECCS pump room air coolers. Isolation and repair of the resulting saltwater leak resulted in a temporary loss of redundancy in the saltwater, service water, and component cooling systems per T.S. 3.7.3.1, T.S.3.7.4.1, and T.S. 3.7.5.1.

While erecting a lead brick shield wall, a worke-dropped a lead brick on CV-5!78, knocking loose a nipple and resultng in a saltwater leak onto the floor. The leak was then stopped with a wooden plug. Permanent repair required taking 11 saltwater sub-system out of service with a loss of cooling to the respective service water and component cooling heat exchangers.

The valve was repaired and affected systems returned to normal at 0645 on January 25. Redundant cooling systems remained operable during this event. This event had no impact on the public health or safety. This is a non-repetitive event.