ML19347D252

LER 81-008/01T-0:on 810211,main Isolation Valve on Loop B Mistakenly Isolated Instead of Loop a Valve During Installation of Test Connection to 1-inch Containment Atmospheric Dilution Line.Caused by Wrong Valve Designation

ML19347D252
Person / Time
Site:	Peach Bottom
Issue date:	02/25/1981
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19347D251	List: ML19347D249 ML19347D252
References
LER-81-008-01T, LER-81-8-1T, NUDOCS 8103110658
Download: ML19347D252 (1)

Text

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8 60 6l DOCKET NUMSER 64 69 EVENT DATE 74 75 REPORT 0 ATE EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h o121l Vith the unit at full power. a 1" line en the ' A' loop of the CAD system I oi3i l was blocked out to install a test connectien. A valve on the '3' loop 1 o i4 l l was mistakenly isolated instead of the correct valve en the ' A' loop i ois I resulting in a breach of primary centainment for about 00 minutes. The 1 016 l l error was discovered and the line isolated by closing the ' A' manual I o;ll isolation valve. If a significant differential pressure developed, the I o 1a , l line could have been isolated with this valve. l

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3$ ,) 37 40 44 43 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h iloll The event was caused by the i= proper designation of valve locatiens en I iiii I a system check-off list resultirs in the valvirs error described above. I

,i2i l When the valving error was discovered, the 'A' loop isolation valve was I

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