ML20005A083

LER 81-039/03L-0:on 810403,pressure Operated Relief Valve Found Lifting While in Automatic W/Associated Block Valve Closed.Caused by Low RCS Pressure Setpoint.Pressure Reduced & Valve Returned to Svc

ML20005A083
Person / Time
Site:	McGuire
Issue date:	05/02/1981
From:	Ouellette R DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A082	List: ML20005A081 ML20005A083
References
LER-81-039-03L, LER-81-39-3L, NUDOCS 8106290355
Download: ML20005A083 (1)

Text

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M l While in Mode 5, initial fuel loading, PORV INC34A was lifting while in , ,

The associated block valve (located in series) was closed, M i automatic ,

g i Thus the' PORV became inoperable." This constituted a degraded mode of 7 M i oneration as' stated in Technical Specification 3.4.10.3. During the time t E I PORV 2NC34A was inocerable. INC32B was available. This is a 100% redundant ,

E I valve so the health and safety of the public were not affected. ,

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~ W L2J @ a O!O i o i p@ (N,,,[ g ty,j g iC 7 F l'"Org CAMES oeSCRIPftoft AficCofinge77VS ACTfol.S g l RCS pressure was being mainta ned at 355 psig The low pressure setpoint ,

EI for the PORV was 395 psig. - A 30 psi range is the best accuracy reasonably ,

M i schievable. The actual setpoint was apparently set on the low side. When ,

i i the PORV lifted the associated block valve was closed. Pressure was re- ,

t,,L,1,,,,ji duced and the PORV was returned to an operable status. ,

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