ML19326D883

LER 80-061/01T-0:on 800708,S&W Review Determined,Under Certain Accident Conditions,Auxiliary Feedwater Pump 1-FW-P- 3B May Be Unable to Supply 340 Gpm.Cause Unknown.Pump Recirculation Flow of 20 Gpm Secured

ML19326D883
Person / Time
Site:	North Anna
Issue date:	07/17/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19326D880	List: ML19326D879 ML19326D883
References
LER-80-061-01T, LER-80-61-1T, NUDOCS 8007230497
Download: ML19326D883 (2)

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U.S. NC LEAR REGULATORY COMMISSION O) t LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1) (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

/0/1/ /V/A/N/A/S/1/_(2) /0/0/-/0/0/0/0/0/-/0/0/ (3) /4/1/1/1/1 (4) / / / (5)

LICZNSEE CODE LICENSE NUMBER LICENSE TYPE CAT CE

/X/ (6) /0/5/0/0/0/3/3/8/ (7) /0/7/0/8/8/0/ (8) h /11/1 # d (9)

DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

/0/2/ / On July 8, 1980, a Stone & Webster review of auxiliary feedwater system design /

l' /0/3/ / determined that, under certain accident conditions, auxiliary feedwater pump /

/0/4/ / 1-W-P-3B may not be able to supply the design basis flow of 340 gpm to its /

/0/5/ / steam generator. Because the pump was operable and could provide a steam /

/0/6/ / generator flow of 335 gpm, the health and nafety of the general public were /

/0/7/ / not affected. Reportable pursuant to T.S. 6.9.1.8.i. /

/0/8/ / /

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/ /C/H/ (11) /B/ (12) /A/ (13) /P/U/M/P/X/X/ (14) g/ (15) fZ/ (16)

SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO. CODE TYPE NO.

(17) REPORT .

NUMBER /8/0/ /-/ /0/6/1/ /\/ /0/1/ /T/ /-/ [0/

ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

/X/ (18) /X/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) /][/ (23) /N/ (24) /A/ (25) /I/0/7/5/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / The cause of this discrepancy is not known at this time. Further evaluation of/

/1/1/ / the problem is in progress to determine the necessary corrective action. In /

/1/2/ / the interim, pump recirculation flow (*20 gpm) will be secured so that all /

/1/3/ / discharge flow is directly to the steam generator. A standing order has been /

/1/4/ / issued for this change. /

FACILITY METHOD OF STATUS  % POWER OTHER STATUS MSCOM DESCRIm0N (32)

/1/5/ /E/ (28) /1/0/0/ (29) / NA /(30pSCOM /D/ (31) / Notification from A/E /

, ACTIVITY CONTENT l RELEASED OF RELEASE AMOUNT OF ACTIVITY (35) LOCATION OF RELEASE (36) l

/1/6/ /Z/ (33) /Z/ (34) / NA / / NA /

I PERSONNEL EXPOSURES

, NUMBER TYPE DESCRIPTION (39) i /1/7/ /0/0/0/ (37) /Z/ (38) / NA /

, PERSONNEL INJURIES

! NUMBER DESCRIPTION (41) l /1/8/ /0/0/0/ (40) / NA /

LOSS OF OR TYPE DAMAGE TO FACILITY (43)

DESCRIPTION

/1/9/ ./Z/ (42) / NA /

PUBLICITY ISSUED DESCRIPTION (45) NRC USE ONLY

/2/0,/_ /N/ (44) / NA /////////////

NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151

Virginia Electric and Power Company Nczth Anna Power Station, Unit #1

Attachment:

Page 1 of I Docket No. 50-338 Attachment to LER 80-061/0lT-0 Description of Event On July 8,1980, during review of auxiliary feedwater pump flow margins, Stone & Webster determined by fluid calculations that under certain accident conditions auxiliary feedwater pump 1-FW-P-3B may be unable to deliver the design flow of 340 gpm to its steam generator. It is estimated that the pump would deliver a total flow of about 355 gpm of which anproximately 20 gpm would be recirculated to the Emergency Condensate Storage Tank and 335 gpm would be delivered to the steam generator. This event is reportable purusant to T.S. 6.9.1.8.i.

Probable Consequences of Event Because of the redundancy in the auxiliary feedwater system an.1 the fact that pump 1-FW-P-3B was capable of supplying at least 335 gpm flow to its steam generator, the health and safety of the general public were not affected.

t Cause of Event The cause of this discrepancy in auxiliary feedwater system design

, is not known at this time.

Immediate Corrective Action An evaluation is in progress to determine the necessary corrective i action. In the interim, recirculation flow from pump 1-FW-P-3B will be  ;

-isolated to provide an additional flow of approximately 20 gpm to 'L? l steam generator. This will be accomplished by closing the reciru pc, lation valve for the. pump. A standing order with appropriate cautious has been issued to infonn Operations of this change.

Scheduled Corrective Action i Scheduled corrective action is pending the results of the current investigation.

Actions Taken to Prevent Recurrence No further actions are required.

Generic Implications Unit 2 auxiliary feedwater pump flow margins have been calculated 1 and are satisfactory. Therefore, there are no generic implications associated with this event.

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