05000338/LER-1980-077-03, /03L-0:on 800821,performing ECCS Valve Position Verification,Incorrect Valve Alignment Affecting Both Lhsi Pump Min Flow Recirculation Paths Discovered.Cause Relates to Change in Rwat Flow Path Alignment to Reduce Temp

/03L-0:on 800821,performing ECCS Valve Position Verification,Incorrect Valve Alignment Affecting Both Lhsi Pump Min Flow Recirculation Paths Discovered.Cause Relates to Change in Rwat Flow Path Alignment to Reduce Temp

ML19338D671
Person / Time
Site:	North Anna
Issue date:	09/18/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338D660	List: 05000338/LER-1980-077, Forwards LER 80-077/03L-0 05000338/LER-1980-077-03, /03L-0:on 800821,performing ECCS Valve Position Verification,Incorrect Valve Alignment Affecting Both Lhsi Pump Min Flow Recirculation Paths Discovered.Cause Relates to Change in Rwat Flow Path Alignment to Reduce Temp
References
LER-80-077-03L, LER-80-77-3L, NUDOCS 8009230636
Download: ML19338D671 (2)

LER-1980-077, /03L-0:on 800821,performing ECCS Valve Position Verification,Incorrect Valve Alignment Affecting Both Lhsi Pump Min Flow Recirculation Paths Discovered.Cause Relates to Change in Rwat Flow Path Alignment to Reduce Temp

Event date:
Report date:
3381980077R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT

- CONTROL' BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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LICENSEE CODE LICE'dSE NUMBER LICENSE TYPF CAT

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

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While performing ECCS valve position verification on August 21, 1980, an in-

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conect valve alignment affecting both LHSI pump minimum flow rceirculation

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paths was discovered. Analysis indicated that LHSI flow via the altered path /

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could have been less than specified minimum flow. This event is reportable

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pursuant to T.S. 6.9.1.9.b.

Long term reliability might have been

.uced had /

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both LHSI pumps started in response to an SI without LHSI to the RCS.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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SEQUENTIAL OttDRRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

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

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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Alignment of the flow path which is shared by the RWST refrigeration units

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might have been changed in an attempt to reduce RWST temperature. Normal LHSI /

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FACILITY METHOD OF STATUS

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/ (30) DISCOVERY DISCOVERY DESCRIPTION (32)

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/ Routine Inspection /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

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LOSS OF OR DAMAGE TO FACILITY @3)

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 L'8o09230(asG

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Virginia, Electric and. Power Company

. North Anna. Power Station,. Unit 1 Attachment: Page'1 of 1 Docker No.~50-338' Report No.-LER 80-077/03L-0.

Description of Event-

- While' performing.an~.ECCS valve position verification procedure on

' August 21, 1980, an incorrect valve alignment effecting both LHSI pump

. minimum flow recirculation paths was discovered. An engineering analy-sis indicated the' recirculation flow had both pumps started in response Lto an SP. signal would have been less-than the minimum recirculation flow

.specified by the manufacturers. This event is reportable pursuant to 1E.S 6.9.1.9.b.

y Brobable-Consequences of Occurrence Calculations' estimated the recirculation flow via'the altered flow path for each LHSI pump to be approximately 214 gpm for dual pump opera-

. tion. The minimum recirculation flow specified by the manufacturer is -

225 gps. llue reduced recirculation flow could have reduced the long-term reliability had both LHSI pumpsistarted in response to an SI signal and remained running without LHSI to the RCS.

Cause of Event

Valve alignment was changed between July 21, 1980 and August 21, 1980. Since RWST refrigeration units share a portion of the recircula-s tion line, alignment'aight have been changed during this period in an attempt to reduce RWST temperature.

- Immediate Corrective Action Normal LHSI minimum flow recirculation path alignment was restored immediately.

Schedaled Corrective Action A valve.in the LHSI minimum recirculation flow line vill be placed under' administrative' control to prevsnt recurrence. Operations personnel will be ' reinstructed. - The same actions will be implemented on Unit 2.

- Actions Taken to Prevent Reccurrence Scheduled: corrective-actions will prevent recurrence.

~ Generic Implica_tions This. event had'no. generic. implications.

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