05000277/LER-1983-002-01, /01T-0:on 830120,RCIC Inboard Steam Supply Isolation Valve Found in Open Position.Caused by Operator Mistakenly Removing Feed from Valve.Operators Counseled to Take Better Precautions

/01T-0:on 830120,RCIC Inboard Steam Supply Isolation Valve Found in Open Position.Caused by Operator Mistakenly Removing Feed from Valve.Operators Counseled to Take Better Precautions

ML20028G440
Person / Time
Site:	Peach Bottom
Issue date:	01/28/1983
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028G430	List: 05000277/LER-1983-002-01, /01T-0:on 830120,RCIC Inboard Steam Supply Isolation Valve Found in Open Position.Caused by Operator Mistakenly Removing Feed from Valve.Operators Counseled to Take Better Precautions ML20028G429
References
LER-83-002-01T, LER-83-2-1T, NUDOCS 8302090349
Download: ML20028G440 (1)

LER-1983-002, /01T-0:on 830120,RCIC Inboard Steam Supply Isolation Valve Found in Open Position.Caused by Operator Mistakenly Removing Feed from Valve.Operators Counseled to Take Better Precautions

Event date:
Report date:
2771983002R01 - NRC Website

text

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LICENSEE EVENT REPORT CONTROL BLOCCI: l l

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80 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10131 lDuring Unit operation, observation in the control' room revealed i

l indicating lights for the RCIC inboard steam supply isolation valve were l O 3 lnot lit, because the breaker for the valve had been opened. Since the i

0 4 Ivalve was opened when the feed breaker was opened,it was not capable of I.

O a O 6 lClosind on an isolation siQnal. DurinG that time the redundant isolationI lTITl Ivalve was not in the closed rosition as required when an isolation valvei 10 l81 lis operable.

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I l The inoperable isolation valve was caused by an operator applying i O l block to remove the reactor water cleanup system from service and I

i i l mistakenly removing the feed from the RCIC system steam supply isolationi

, 2 g ivalve.

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Iperforming blocking functions.

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