05000366/LER-1980-066-03, /03L-0:on 800422,while Unit Was in Startup & Hot Standby Mode,Reactor Core Isolation Cooling valve,2E51-F045, Was Operated Causing Spurious HPCI Auto Isolation,During Performance of Surveillance Procedure HNP-2-3405

/03L-0:on 800422,while Unit Was in Startup & Hot Standby Mode,Reactor Core Isolation Cooling valve,2E51-F045, Was Operated Causing Spurious HPCI Auto Isolation,During Performance of Surveillance Procedure HNP-2-3405

ML19323C590
Person / Time
Site:	Hatch
Issue date:	05/07/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19323C587	List: 05000366/LER-1980-066, Forwards LER 80-066/03L-0 05000366/LER-1980-066-03, /03L-0:on 800422,while Unit Was in Startup & Hot Standby Mode,Reactor Core Isolation Cooling valve,2E51-F045, Was Operated Causing Spurious HPCI Auto Isolation,During Performance of Surveillance Procedure HNP-2-3405
References
LER-80-066-03L, LER-80-66-3L, NUDOCS 8005160370
Download: ML19323C590 (2)

LER-1980-066, /03L-0:on 800422,while Unit Was in Startup & Hot Standby Mode,Reactor Core Isolation Cooling valve,2E51-F045, Was Operated Causing Spurious HPCI Auto Isolation,During Performance of Surveillance Procedure HNP-2-3405

Event date:
Report date:
3661980066R03 - NRC Website

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OJ EVE NT DATL 74 73 14EPOnT DAlf 80 LVENT DESCnlPTIOfl AfJD PROBAULE CoNSEouENCES h [0121 [At th'e time of the occurrence the unit was in the startup and hot stand-I g ;by mode following the vent header deflector and surveillance outage.

I go g4; lWhile performing surveillance procedure llNP-2-3405, RCIC Pump Operabili-I i y, the RCIC valve 2E51-F045 was operated causing a spurious HPCI auto I

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li sol a ti on, thereby m.aking IIPCI inop.

There were no effects upon public 1 o c l health and safety due to this event.

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40 43 42 43 44 47 CAUSE DESCHIPilON AND CORRECTIVE ACTIONS h 11.101 l Grounds were found on the PN portion of PA station battery.

One of'the 1 y l grounded circuits _ supplies control power fpr a HPCI auto isniatinn sig 1

i,igi [_nal.

The cumulative effect of the aforementioned arounded circuit and I

gi,3, l the intermittent ground in a cable going to 2E51-F045 caused the HPCI l

iii4j l auto isolation.

The ground was repaired and HPCI and RCIC were o n e r a h l ol.

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, 7 a o to 68 69 80 5 NAME Of PitEPAf tf H C. l. C000in. Supt. P1t. Eng. Serv.

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O i,En #:

5 0-3 66 /1980-O r>6 T, i c e n s e e :

Georgin Pouer Company Facility tin me :

Edwin I.

Iln t c h Docket #:

50-366

'inrrative Report for T. E R 50-366/1980-of,6 At the tine of the occurrence (0420 CnT on 4-22-80) the uni t was in the neartup nnd hot standby mode nt 240 negawnttn (thernn1) following the vent hender deflector and surveillance outnge.

'Jh i l e performing surveillance procedure 11 N P 3 4 0 5,

""CIC l' u ri p Opernbility", the RCIC valve 2E51-9045 was operated causing spurioun IIPC T auto isolation, thereby m a k i n e, IIP C T a

inop.

It was evident that a spike e n ti s e d the auto isolation niuce

~he isointion cleared following initintion.

At the time of thi. spurious iso 16 tion a ground existed on the P fl portion of nLation hattery 2A which was determined to be in circuits 17 nnd 27 in DC distribution enhinet 2R25-S001.

Circuit 17 supplies control power for n 11PC T auto isolation signal, upon further investigation, a cabic going to RCTC valve 2E51 r045 uns found to S r. v e an intermittent ground also.

This intermittent ground appenred only upon operation of 2E51-F045 m a k i n e, it essentially a ground spike.

The cumulative effect of the ground n circuit 17 and the ground spike caused n liPCT nuto isointion signal to initiate.

The grounds on circuits 17 nnd 27 were repaired n11ouing operation of the RCIC valve 2E51-F045 without causing a 11 P C I nuto isointion.

the problem is not applicable to IJnit 1,

since"no battery grounds exist on the same circuit on IIn i t 1.

The unit is nov in full comp 1innce with the requirements, and no further reporting is requirad.

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