ML20010C467

LER 81-049/03L-0:on 810714,testing Following Reactor Trip Revealed That MSIV 33,35,36 & 37 Lifted at Less than Required Setpoint.Caused by Setpoint Drift.Valve lift-reseat Setpoints Reset

ML20010C467
Person / Time
Site:	Crystal River
Issue date:	08/12/1981
From:	Charles Brown FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010C465	List: ML20010C464 ML20010C467
References
LER-81-049-03L, LER-81-49-3L, NUDOCS 8108200109
Download: ML20010C467 (2)

Text

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/ 60 61 DOCKET NUMBER EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES h I o l 2 l l Performance of SP-650, Main Steam Code Safety Valves Test, following a Reactor trip l lo l3 l l at 0954 revealed that Main Steam Line Valves MSV-33,35,36 & 37 lifted at less than the l

[ o l .t l l required setpoint contrary to T.S.3.7.1.1. Maintenance was initiated. Operability I o s lwas restored within 14 hrs. There was no effect upon the health or safety of the i lo l6 l l General Public. This was the first time MSV-33 & 37 opened belog the setpoint, the f '

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-Report #50-302/81-049/03I-0 Facility: Crystal River Unit 3

~ Re; irt: Date: August 12, 1981 Occurrence Date: July-14, 1981 Identification of Occurrence:-

' Main' steam lim code safety valves lifted below setpoint contrary to .whnical Specification 3 7.1.1.

LConditions Prior to Occurrence:

Mode 3 - Hot shutdown (O%)

Description of Occurrence:

Performance of SP-650, Main' Steam Code Safety Valves Test, following a Reactor trip which occurred. at 0954 revealed that Main Steam Line Code Valves MSV-33,35,36 and 37 lifted at less .thaa the required setpoint.~ Maintenance was initiated,and operability was restored within 14 hrs. '

Designation of Apparent Cause:

The cause of this event is attributed to setpoint drift.-

Analysis of Occurrence:

There was no effect upon the health or' safety of the general public.

' Corrective Action:

The valve lift / reseat setpoints were reset. No further corrective action is deemed necessary.

Failure Data:

This was the . firat time MSV-33 & 37 opened below setpoint, ',

the second time MSV-35 & 36 ' opened below setroint, and this 3 is the fourth event reported under this specification.

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