ML19270F242

LER 79-003/03L-0 on 790106:during Rx Runback Following Turbine Trip,Main Feedwater Block Valve FWV-30 Did Not Close.Caused by Valve Sticking on Its Back Seat.Corrective Action:Manual Cycling

ML19270F242
Person / Time
Site:	Crystal River
Issue date:	01/26/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19270F240	List: ML19270F239 ML19270F242
References
LER-79-003-03L, LER-79-3-3L, NUDOCS 7902050187
Download: ML19270F242 (2)

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7 8 60 41 EVENT DESCRIPLON AND PROSABLE CCNSEcvENCES h a#2 l At 0242, during Rx runback following a turbine trip. it was discovered I

, ,,, , that a main feedwater block valve (FWV -30) did not close. This is contrary ,

o..  ; to Technical Specification 3.3.2.1, Table 3.3-5. No effect upon public I ois I health and safety as redundant systems were ,vailable , a nnor,hle. Tvn I

, , , i previous occurrences of this tyoe reported, but first occurrence for FWV-30 0 7 l I a.e; I I SYS?t u CALSE CALSE COU8 vai,v t COCE CCCE SLBCOOE COY 80%ss? CODE SLBOOOE SL4COCE r

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, io,l The cause of 'this anomaly is attributed to FWP-30 beine stuck on its back t

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, , i was restored following satisfactory completion of engineering safeguards ,

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(S TTACHED SUPPLEMENTARY INFORMATION SBEET) 7902050 /87

SUPPLEMENTARY INFORMATION Report No.: 50-302/79-003/03L-0 Facility: Crystal River Unit #3 Report Date: 26 January 1979 Occurrence Date: 6 January 1979 Identification of Occurrence:

Feedwater block valve (FWV-30) inoperable contrary to response time specified in Technical Specification 3.3.2.1, Table 3.3-5.

Conditions Prior to Occurrence:

At 0242, during a reactor runback following a turbine trip, it was discovered that a main feedwater block valve (FWV-30) did not close. "A" feedwater line was isolated and the reactor manually tripped. Feedwater flow was re-established with emergency feed-water pump (EFP-2). FWV-30 was rendered operable at 0615, 6 January 1979.

Designation of Apparant Cause:

The cause of this anomaly aas attributed to FWV-30 being stuck on its back seat.

Analysis of Occurrence:

There was no hazard to the plant or general public as redundant emergency feedwater systems were available and operable.

Corrective Action:

No corrective action necessary. FWV-30 was manually taken off its back seat, cycled and rendered operable after satisfact-ory completion of engineering safeguards actuation response time test (SP-135).

Failure Data:

Two previous occurrences of this type but first occurrence of FWV-30.

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