ML19310A212

LER 80-020/03L-0:on 800429,during Power Operation,Rcs Pressure Was Too Low Due to Stuck Pressurizer Spray Valve & Reactor Tripped on Low Steam Generator Level During Load Reduction.Caused by Loose Valve Seat.Valve Repaired

ML19310A212
Person / Time
Site:	Millstone
Issue date:	05/29/1980
From:	Gurney P NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19310A205	List: ML19310A204 ML19310A212
References
LER-80-020-03L, LER-80-20-3L, NUDOCS 8006060285
Download: ML19310A212 (1)

Text

i NRC FORF.1386 U. S. NUCLEAR REGULATORY CCMAtISSION (7 771 ~

LICENSEE EVENT REPORT

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QATE

- ~ - I 7 8 60 61 COCKET NisM8ER 68 69 EVENT OATE EVENT DESCRIPTION AND PRCBA8LE CONSEQUENCES h 1 o 121 l During routine oower operation, the reactor coolant system orersure was less than l l

lo isi i that allowed by Technical Specification 3.2.6. The pressure decrease was caused by I  !

Io i4 l i the loop 1 A pressurizer spray valve sticking open. The reactor tripped on low I i o i s i t steam generator level during load reduction following discovery of the stuck valve. I io is i l There are no probable consequences since the unit was operated in accordance with I loi7i i Technical Specification 3.2.6. I I

Io ea1 I N 7 8 9 OE COE SUSCC E COMPCNENT CODE SUB CCE SU E 1o691 I cl a l@ LL]@ La_J@ I v l a l i l v l e i x i@ l pl@ LIJ :O 7 8 9 10 11 12 13 18 19 SEQUENTIAL CCCURRENCE REPCRT REVISION .

LER EVENT YEA R REPORT NO. CODE rYPE NO.

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CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS l # 3 l l The valve stuck open due to a loose valve seat. The valve was isolated for subsecuent I ii,ij istartup. During a later, unrelated outage the valve was recaired. Valve data: I i,,,, i 3 inch Fischer Controls angle valve with air operator. l 1: 131 1 I 1

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sPowtR OTHER STATUS h $155NY Operator Observation CISCCVERY CESCRIPTION I

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ACTiviry CCSTENT cEt toCATioN CP RELEASE @

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1. ERSONNEL EXPC$unES NU*.'8 E R TYPE CESCRIPTION l i l 71 10 l 0101@l Z l@l N l PERSCwE L .N2URiES Nu , ER oESCRi,Ticu@

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