05000302/LER-1979-071-03, /03L-0 on 790801:in Mode 1,reactor Bldg Isolation Valves CAV-4 & CAV-6 Would Not Close from Control Room After Securing from Continuous Blowdown.Caused by Valves Being Stuck & Underlubricated.Valves Freed & Lubricated

/03L-0 on 790801:in Mode 1,reactor Bldg Isolation Valves CAV-4 & CAV-6 Would Not Close from Control Room After Securing from Continuous Blowdown.Caused by Valves Being Stuck & Underlubricated.Valves Freed & Lubricated

ML19276H031
Person / Time
Site:	Crystal River
Issue date:	08/27/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19276H028	List: 05000302/LER-1979-071, Forwards LER 79-071/03L-0 05000302/LER-1979-071-03, /03L-0 on 790801:in Mode 1,reactor Bldg Isolation Valves CAV-4 & CAV-6 Would Not Close from Control Room After Securing from Continuous Blowdown.Caused by Valves Being Stuck & Underlubricated.Valves Freed & Lubricated
References
LER-79-071-03L, LER-79-71-3L, NUDOCS 7908310481
Download: ML19276H031 (2)

LER-1979-071, /03L-0 on 790801:in Mode 1,reactor Bldg Isolation Valves CAV-4 & CAV-6 Would Not Close from Control Room After Securing from Continuous Blowdown.Caused by Valves Being Stuck & Underlubricated.Valves Freed & Lubricated

Event date:
Report date:
3021979071R03 - NRC Website

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N SUPPLEMENTARY INFORMATION Report No.:

50-302 / 79-071/03L-0 Facility:

Crystal River Unit #3 Report Date:

22 August 1979 Occurrence Date:

1 August 1979 Identification of Occurrence:

Reactor Building isolation valves CAV-4 and CAV-6 inoperable contrary to Technical Specification 3.6.3.1.

Conditions Prior to Occurrence:

Mode 1 power operation (25%)

Description of Occurrence:

At 0200, it was reported that Reactor Building 'A' OTSG sample line isolation valves, CAV-4 and CAV-6, would not close when securing from continuous blowdown.

Manual isolation valves CAV-318, 321, 14d and 149 were closed and CAV-4 and CAV-6 were deactivated in the closed position as per the action statement requirements of Technical Specification 3.6.3.1.

Maintenance restored operability and CAV-4 and CAV-6 were returned to service.

Designation of Apparent Cause:

The cause of this event is attributed to CAV-4 being stuck on its backseat and CAV-6 having insufficient lubrication.

Analysis of Occurrence:

No effect upon the plant or general public as manual isolation valves CAV 148, 149. 321 and 318 were closed.

Corrective Action

CAV-4 was freed from its backseat and CAV-6 was lubricated.

Both valves were returned to service after satisfactory completion of Quarterly Cycling of Valves Procedure SP-370.

Request for Engineering Information 79-7-3 has been written to evaluate this event and provide solutions to prevent recurrence.

Failure Data:

This is the sixth occurrence of this type reported.

Ref:

LF.R's (77-36 & 122), (78-14), (79-37 & 38)

/ws 035 513