05000321/LER-1980-049-01, /01T-0:on 800513,MSIV Auto Closed on High Steamline Flow During HNP-1-3119 Performance Causing Rx Scram & HPCI Initiation.Hpci Spurious Isolation Signal Cause Not Known & Investigation Continuing

/01T-0:on 800513,MSIV Auto Closed on High Steamline Flow During HNP-1-3119 Performance Causing Rx Scram & HPCI Initiation.Hpci Spurious Isolation Signal Cause Not Known & Investigation Continuing

ML19323E437
Person / Time
Site:	Hatch
Issue date:	05/19/1980
From:	Baxley S GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19323E431	List: 05000321/LER-1980-049, Forwards LER 80-049/01T-0 05000321/LER-1980-049-01, /01T-0:on 800513,MSIV Auto Closed on High Steamline Flow During HNP-1-3119 Performance Causing Rx Scram & HPCI Initiation.Hpci Spurious Isolation Signal Cause Not Known & Investigation Continuing
References
LER-80-049-01T, LER-80-49-1T, NUDOCS 8005230547
Download: ML19323E437 (2)

LER-1980-049, /01T-0:on 800513,MSIV Auto Closed on High Steamline Flow During HNP-1-3119 Performance Causing Rx Scram & HPCI Initiation.Hpci Spurious Isolation Signal Cause Not Known & Investigation Continuing

Event date:
Report date:
3211980049R01 - NRC Website

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8 60 61 DOCKET NUMBER -

68 63 EVENT DATE 74 75 REPORT DATE tio EVENT DESCRIPTION AND PROBAOLE CONSEQUENCES h lO i2l lWhile performing HNP-1-3119 MSIV exercise the MSIV's auto closed on high l lO i3l lsteamline flow and this caused Rx scram and HPCI. initiation due to low I

1 x water level.

HPCI did not auto start due to a sourious HPCI hioh l

R O 4 lO isi ls team line flow isolation signal.

There were no effects upon public I

lhealth and safety due to this event.

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9 10 11 12 13 18 19 20 SEQUENTIAL OCCUR R E NCE REPORT REVISION

,.,,, EVENT YEAR FIEPORT NO.

CODE TYPE N O.

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40 di 47 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lilOl l The cause of this spurious rignal is not vet known and evaluation is coI lntinuing.

The HPCI system was proved operable by performing a manual "l

i i l Full flow test" and an auto " Quick start test without receiving a high I

l steam flow signal.

The delta press switches were checked and found t%'

, 3 l be operable and incalibration.

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8 9 10 11 44 45 80 Pt"RSONNEL EXPOSUHES NUMBER TYPE

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DESCRIPTION

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7 8 9 il 12 80 LOSS OF Oft OAMAGE TO FACittTY TYPE

DESCRIPTION

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80. E S. X. Baxley, Supt. of Oper.

(912) 367-7781 o

NA' ~ OF PREPARER PHONE:

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Plant E.

I. Hatch May 19, 1980 LER #50-321/80-49

NARRATIVE

REPORT

~

On 5-13-80 at 1641 while performing HNP-1-3119 MSIV exercise test, the "D" MSIV was closed too far causin~g high flow in the other 3 lines.

This caused an auto closure of the MSIV's and a resultant' Rx scram and low water level initiation of HPCI.

The HPCI system did not auto start because it had isolated on a spurious HPCI steam line high flow.

The HPCI system was manually started for Rx vessel makeup and performed satisfactorily.

Prior to Rx startup a manual " Full flow test" and an auto " Quick start test were performed satisfactorily.

The Delta P switches were checked and. found operable and in calibration.

The cause of this spurious HPCI high steam line flow isolation is not yet known and is still being investigated.

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