05000302/LER-1979-003-03, /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

/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: 05000302/LER-1979-003, Forwards LER 79-003/03L-0 05000302/LER-1979-003-03, /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
References
LER-79-003-03L, LER-79-3-3L, NUDOCS 7902050187
Download: ML19270F242 (2)

LER-1979-003, /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

Event date:
Report date:
3021979003R03 - NRC Website

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'l mE*CRT Dart 60 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.

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FWV-30 was manually taken off its backseat and eveled.

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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.

/rc