ML19210C433

LER 79-140/03L-0:on 791013,after Condensate & Feedwater Pumps Secured for Refueling,Containment Isolation Check Valve 1-FW-111 Be Stuck Open.Cause Unknown.Valve Will Be Disassembled & Repaired During Current Outage

ML19210C433
Person / Time
Site:	North Anna
Issue date:	11/12/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19210C432	List: ML19210C431 ML19210C433
References
LER-79-140-03L, LER-79-140-3L, NUDOCS 7911140243
Download: ML19210C433 (2)

Text

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o i 7 3 60 61 DOCKET NUMSER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h

&LLJ l After the condensate and feedwater pumps were secured for refueling, containment i isolation check valve 1-FW-ill was observed to be partially stuck open as evidenced lO 3lby back leakage from "C" steam generator to the feedwater heaters. The health and I 0.,; safety of the general public were not affected by this event.

Reportable pursur.. to lo 3;T.S. 6.9.1.9.b.

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33 34 35 36 3/40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l The cause for the check valve stit'<ing open is not known at this time. The valve was li O[i li l l radiographed but tne results were unsuccessful due to the thickness of the valve body.

I The valve will be disassembled and repaired as determined necessary during the current l i 2l outage.l, 3 i 4 1 1 7 8 9 80 ST 5% POWER OTHER STATUS ISCOV RY DISCOVERY DESCRIPTION LtLj@ l 0101 nl@l ral[L.j@l onaratnr nhwrvatinn li s' JTIVITY""CC TNT WOUNTOhCTIVITY @ I LOCATION OF RELEASE @

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7%-/pg NUven 7 1010101@lNAli a 7 8 9 11 12 80 LOSS OF OR OAMAGE TO FACILITY Q TYPE DESCRIPTION N/[i 9l Z l@lNAl7 8 9 10 80 PTiON O 7911140 g Q

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.Virginia Electric and Pcwer Company fiorth Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket tio. 50-338 Report flo. LER 79-140/03L-0 Description of Event On October 13, 1979, with the unit in refueling mode, containment isolation check valve 1-FN-lll was observed to be partially stuck open as evidenced by back leakaSe from "C" steam generator to the feedwater heaters when the condensate and feedwater pumps were secured. The inoperability of containment isolation valve 1-FW-lll is contrary to T.S. 3.6.3.1 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence The health and safety of the general public were not affected because the check valve was found inoperable while the unit was in a safe shutdown condition and will be restored to operable status prior to resuming operation.

There are no generic implications associated with this event.

Cause of Occurrence The exact cc.use for 1-FW-lli sticking open is not known at this time.

Immediate Corrective Action The valve was radiographed but the results of the examination were unsuccessful because of the thickness of the valve body.

Scheduled Corrective Action The check valve will be disassembled and repaired as necessary during the current refueling outage.

Actions Taken to Prevent Recurrence flo further actions are required.

' " 9 280