05000219/LER-1980-001-01, /01T-o:on 800105,while Performing Electromatic Relief Valve Operability Test,Emergency Releie Valve D Failed to Open.Caused by Component Failure Due to Retainer Ring Being Backed Off Approx Six Threads

/01T-o:on 800105,while Performing Electromatic Relief Valve Operability Test,Emergency Releie Valve D Failed to Open.Caused by Component Failure Due to Retainer Ring Being Backed Off Approx Six Threads

ML19263F427
Person / Time
Site:	Oyster Creek
Issue date:	01/21/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19263F426	List: 05000219/LER-1980-001, Forwards LER 80-001/01T-0 05000219/LER-1980-001-01, /01T-o:on 800105,while Performing Electromatic Relief Valve Operability Test,Emergency Releie Valve D Failed to Open.Caused by Component Failure Due to Retainer Ring Being Backed Off Approx Six Threads
References
FOIA-81-159 LER-80-001-01T, LER-80-1-1T, NUDOCS 8001280256
Download: ML19263F427 (3)

LER-1980-001, /01T-o:on 800105,while Performing Electromatic Relief Valve Operability Test,Emergency Releie Valve D Failed to Open.Caused by Component Failure Due to Retainer Ring Being Backed Off Approx Six Threads

Event date:
Report date:
2191980001R01 - NRC Website

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0, ATE 74 75 REPOET C ATE 50 EVENT DESCRIPTION AND PROB ABLE CONSEQUEi.CES h El I On Januarv 5, 1980, while cerformine the e'eCtronatic relief valve oper-l c i s,, ability test, the 'D' EMRV failed to open.

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Madison Avenue at Punch Bow! Road Morristown New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/80/1/IT Report Date January 21, 1980 Occurrence Date January 5,1980 identification of Occurrence Violation of the Technical Specifications, paragraph 3.4.B.2, when EMRV 'D' did not open when tested during shutdown.

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

Conditions Prior to Occurrence The plant was being shutdown for refueling and maintenance.

The major parameters at the time of occurrence were:

Power:

Reactor, 280 MWt Generator, O MWe Flow:

Recirculation 12.6 x 106 gpm Feedwater.8 x 104 #/hr.

Stack Gas:

2.67 x 104 pei/sec Description of Occurrence On Saturday, January 5, 1980 at approximately 3:00 AM while performing the Electromatic Relief Valve Operability Test, the 'D' EMRV failed to open.

There were three attempts to open the 'D' EMRV and each time there was no audible indication of steam flow detected and there was not a similar increase in the downcomer line temperature as noted in the other EMRV tests.

Apparent Cause of Occurrence Component failure was the cause of this event.

The retainer ring was backed off about six threads and ;he grab screw was missing.

It appears as though the grab screw was improperly assembled during previous assembly.

1817 350 Jete, Cr4 Po..e' & Liant Company e; a nmber of t e Genet Pat : Uuties System

l Repcrtable Occurrence Pace 2 Report No. 50-219/80/1/1T Analysis of Occurrence The relief valves of the automatic depressurization system enab'es the co're spray system to provide protection against the small break in the event the feedwater system is not active.

Since the 'D' EMRV was inoperable, the A.D.S. was con-sidered to be operable in a degraded mode.

The loss of one EMRV has been addressed in the loss of cooling accident analysis.

Also, the relief valves are provided to remove sufficient energy from the primary system to prevent the safety valves fr>m lifting during a transient.

The limiting pressure transient is a turbine trip rom rated design power with a failure of the bypass to function.

The five relief valves are required to operate to prevent reaching the lowest setpoint of the primary system safety valves. With four relief valves operable and the core thermal power not reduced to 1740 MWt to preserve a 25 psig margin between peak transient pressure and the lowest safety valve setpoint, there was no assurance that the safety valves would not lift.

Corrective Action

The EMRV was removed and transported to the test stand where it was discovered that the retainer ring was backed off about six threads and the grab screw which keeps the retainer ring in place was missing.

The other four EMRV's will be removed cnd inspected for the same problem.

The probable cause was due to improper rebuilding.

All rebuilt valves will be checked for proper installation of the grab screw.

Failure Data NR108D Size:

6x8 Mfg.:

Dresser industries

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