05000348/LER-1980-080-03, /03L-0:on 801225,w/pressure Vessel Head Removed for Refueling,Operating B Train RHR Became Inoperable When Loop Suction Valve Closed.Caused by Signal from Pressure Transmitter Loop.Valve Reopened

/03L-0:on 801225,w/pressure Vessel Head Removed for Refueling,Operating B Train RHR Became Inoperable When Loop Suction Valve Closed.Caused by Signal from Pressure Transmitter Loop.Valve Reopened

ML19341B675
Person / Time
Site:	Farley
Issue date:	01/28/1981
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19341B674	List: 05000348/LER-1980-080, Forwards LER 80-080/03L-0 05000348/LER-1980-080-03, /03L-0:on 801225,w/pressure Vessel Head Removed for Refueling,Operating B Train RHR Became Inoperable When Loop Suction Valve Closed.Caused by Signal from Pressure Transmitter Loop.Valve Reopened
References
LER-80-080-03L, LER-80-80-3L, NUDOCS 8102030618
Download: ML19341B675 (1)

LER-1980-080, /03L-0:on 801225,w/pressure Vessel Head Removed for Refueling,Operating B Train RHR Became Inoperable When Loop Suction Valve Closed.Caused by Signal from Pressure Transmitter Loop.Valve Reopened

Event date:
Report date:
3481980080R03 - NRC Website

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7 8 9 LICENSEE Coot 14 15 uCENSE NUMBER 25 26 UCENSE TYPE 40 57 CA 7 66 CON'T M

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60 Si ooCEET NUMB ER 68 69 EVENT oATC 74 75 RE70RToATE 80 EVENT DESCRIPTION AND PRO 8ABLE CONSEQUENCES h

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i Io 121 l At 2350 on 12/25/80, with the pressure vessel head removed for refueling, the loop l

ro T31 I suction valve for B train RHR closed which resulted in the operating 3 train RHR be-l 6

l coming ino,erable. Tech. Spec. 3.9.8 requires at least one RHR loop to be in operationj g l Tech. Spec. 3.9.8 action statement requirements were met.

Health / safety of the public g l were not affected by this occurrence.

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33 34 35 36 37 40 el 42 43 44 47 CAuSE DESCRIPTION AND CORRECTIVE ACTIONS h l110 I I The suction valve was closed by a sinnal from the reactor coolant system pressure I

[LLi,) I transmitter loop.

The looo was being de-terminated from its electrical penetr:ition whild L' 1.2_j l energized in order to repair the penetration when the instrument leads were inadver-l

@ l tently shorted resulting in the closing signal.

The valve was reopened and RHR pump - l gl 1B was returned to service at 2355 on 12/25/80.

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