05000219/LER-1979-043-03, /03L-0:on 791228,while Performing Surveillance Test on Reactor Bldg to Suppression Chamber Air Operated Vacuum Breakers,Valve V-26-16 Failed.Cause Undetermined. Valve to Be Inspected During Outage & Tested After Maint

/03L-0:on 791228,while Performing Surveillance Test on Reactor Bldg to Suppression Chamber Air Operated Vacuum Breakers,Valve V-26-16 Failed.Cause Undetermined. Valve to Be Inspected During Outage & Tested After Maint

ML19257C616
Person / Time
Site:	Oyster Creek
Issue date:	01/24/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19257C605	List: 05000219/LER-1979-043, Forwards LER 79-043/036-0 05000219/LER-1979-043-03, /03L-0:on 791228,while Performing Surveillance Test on Reactor Bldg to Suppression Chamber Air Operated Vacuum Breakers,Valve V-26-16 Failed.Cause Undetermined. Valve to Be Inspected During Outage & Tested After Maint
References
LER-79-043-03L, LER-79-43-3L, NUDOCS 8001290495
Download: ML19257C616 (3)

LER-1979-043, /03L-0:on 791228,while Performing Surveillance Test on Reactor Bldg to Suppression Chamber Air Operated Vacuum Breakers,Valve V-26-16 Failed.Cause Undetermined. Valve to Be Inspected During Outage & Tested After Maint

Event date:
Report date:
2191979043R03 - NRC Website

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NAME OF PREPARER

Jersey Central Power & Ught Company Madison Avenue at Punch Bowl Road j " - ' '

Momstown. New Jersey 07960 (201)N OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/79-43/3L Report Date Janua ry 24, 1980 Occurrence Date December 28, 1979 Identification of Occurrence Violation of the Technical Specifications, paragraph 3.5. A.4.a, when a reactor building to torus vacuum breaker did not open during a survelliance test.

This event is considered to be a reportable occurrence as defined in the Techni-cal daecifications, paragraph 6.9.2.h.2.

Condicions Prior to Occurrence The plant was operating at steady state power.

Plant parameters at the time of occurrence were:

Power:

Reactor,1636 MWt Generator, 568 Mwe Flow:

Feedwater, 6.15 x 106 /hr.

Recirculation, 16 t 10 gpm Stack Gas:

2.16 x 104 pC1/se,.

Description of Occurrence On Friday, December 28, 1979, at approximately 3:00 p.m., while performing the reactor building to suppression chamber air operated vacuum breaker test, valve V-26-16 failed to operate.

Additional open signals were applied to V-26-16 and after approximately 21/2 minutes, the valve opened.

Subsequent cycling of V-26-16 failed to repeat the original problem, but there was evidence of binding.

This "alve was cycled daily from the date of occurrence to the outage January 6, 1980.

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Apparent Cause of Occurrence Valve V-26-16 failed to open.

The cause has not been determined.

Jersey Central Power & Ught Company is a Member of the General Pubhc Utilities System

Reportable Occurrence Page 2 Report No. 50-219/79-43/3L Analysis of Occurrence The purpose of the vacuum relief valves is to equalize the pressure between the suppression chamber and the reactor building so that the containment external design pressure limits are not exceeded.

The vacuum relief system from the reactor building to the suppression chamber :onsists of two 100% vacuum relief breaker subsystems. The vacu'sn breakers are sized in relation to the vent from the chamber so that make-up flow under any conditions following venting is ade-quate to prevent external pressure greater.han one half the design pressure.

With the vacuum relief system in the degrased condition, the syst-m was still capable of venting the suppression chamber if it had been necessar '.

Corrective Action

A Job order has been initiated to inspect the valve this outage. The valve will be tested following maintenance. A PORC Action item has been issued to report back to the PORC the results of the maintenance investigation on the valve failure mechanism.

Failure Data Fisher Controls Company Continental Division Coraopolis, Pennsylvania 20" Butterfly Valve Type 9110 18Sf051