ML19095A507

Submit Licensee Event Report No. LER-78-007/03L-0 Re Leak on Body to Bonnet Joint Diaphragm Valve 1-CH-98

ML19095A507
Person / Time
Site:	Surry
Issue date:	05/05/1978
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	O'Reilly J NRC/RGN-II
References
Serial No. 256 LER 1978-007-03L-0
Download: ML19095A507 (3)

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NRC FORM 366

(~-7,7) e LICENSEE EVENT REPORT CONTROL BLOCK: I IG) (PLEASE l'RINT OR TYPE ALL' nr:aum:m INFOR:'MTION).

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• 80 EVENT DESCRIPTION AND PR09ABLE CONSEQUENCES (w) .*

leak was discove*red on the l

[ITIJ I With unit in normal operation at:full power, a

[IT[] hody to bonnet joint of diaphragm valve l-CH-93 . . To repair the leak it

~ was necessary to stop the A .and B Boric Acid Transfer pumps,* thereby re::__i .**

!Im moving one flow path of boric acid to the r~eactor~ This co-0:dition ~as:

mI] contrary to T.S. 3.2.B.4 and reportable per T:S. 6.6.2.b(2) ... *The he_alth f. *,," .: ..::* . -:.

@:'ID I and. safety of the public were not affected since a* 1:edundant flow* path *:-.* ...

[D]J I was operable.

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. [III] I A unit ra'!!Pdown was commenced. The valve was repaired and A :Boric Acid_J Transfer pump restarted. The unit was returned to full power after____ a J ITID :i::epnced pawer

• period of about three minutes. _ _ _ _ _ _ _ _ _ _ _

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AAqun STATUS %POW2'R OTHERSTATUS METHOD OF DISCOVERY

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__ Surry Power Station, Unit 1 Docket No.: 050-0280 ..

,Report No. : 78-007 /03L-0.

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Event Date: 4/7 /78 Temporary Loss of Flow Path from the Boric Acid Tanks

1. Description of Event:

During normal station operation at rated power, the operator observed an increase in level of A Boric Acid Storage Tank (BAST). A corresponding drop was noted in B BAST level. Another operator inspecting for the cause of the problem discovered a pencil stream leak_ from the body-to-bonnet joint of l-CH-98, a cross connect valve between the discharge lines of A and B Boric Acid Transfer pumps. Leak isolation and repair required shutdown of

.both transfer pumps. Since A pump was supplying. one boron flow path to the

• core, pump shutdown was contrary to Technical Specification 3.2:B.4 and was reportable in acco-rdance with_ Technical Specification 6 .6. 2. b(.2).

2. Probable Consequence of Event/Status of Redundant Systems:

The temporary stopping of the Boric Acid Transfer pumps had no effect upon the health or safety of the general public because in the event of a safety injection, the charging pumps take suction from the refueling water storage tank. This second path was operable.

3. Cause of Event:.

The temporary stopping of "A" Boric Acid Transfer pump was prompted by failure of valve l-CH-98. The rupturing of the valve's diaphragm permitted the transfer of Boric Acid from Tank B to A, and-leakage to the floor of the Auxiliary Building.

4. Immediate Corrective Action:

The immediate action was to commence unit ramp down. Valve 1-CH-98 was then repaired by replacing the ruptured diaphragm. The valve was returned to service and "A" transfer pump restarted. With two flow paths, as required, the Unit was returned to full power.

5. Scheduled Corrective Action No other corrective action is scheduled.

6. Action Taken to Prevent Recurrence Replacement of the failed valve's diaphragm suf:fices as an action to prevent recurrence.

7. Generic Implications At this time, the failure of the diaphragm valve is not considered to have generic implications, since these valves are covered by a periodic dia-

• phragm replacement program. This failure was a random failure within that program.