ML18086A544

Forwards LER 81-006/03L-0.Detailed Event Analysis Encl

ML18086A544
Person / Time
Site:	Salem
Issue date:	05/18/1981
From:	Steele W, Uderitz R Public Service Enterprise Group
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18086A545	List: ML18086A544 ML18086A546
References
NUDOCS 8105270330
Download: ML18086A544 (3)

Text

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PS~G Public Service Electric and Gas Company 80 Park Plaza Newark, N.J. 07101 Phone 201/430-7000 May 18, 1981 Mr. Boyce H. Grier Director of USNRC Off ice of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 81-06/03L Pursuant to the requirements of Salem Generating Station Unit No. 2 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 81-06/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours,

/f&.~~

R. A. Uderi t;-5 General Manager -

Nuclear Production CC: Director, Office of Inspection and Enforcement (30 copies)

Director, Office of Management Information and Program Control (3 copies)

/Joo~

s 1/;

%*2001 1350Mi -l-80

Report Number: 81-06/03L Report Date*: May 18, 1981 Occurrence Date: April 19i 23 and 24, 1981 Facility: Salem Generating Station, Unit 2 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Pressurizer Overpressure Protection System (POPS) inoperable CONDITIONS PRIOR TO OCCURRENCE:

April 19, 1981 - Mode 5 - Rx Power 0% - Unit Load 0 MW April 23 and 29, 1981 - Mode 4 - Rx Power 0% - Unit Load 0 MW DESCRIPTION OF OCCURRENCE:

While in cold shutdown on April 19, 1981, the Control Room Operator observed a temperature of 210°F on the pressurizer relief valve out-let temperature indicator (150°F is the normal operating temperature) .

Since POPS valves 2PR47 and 2PR1 were closed, the operator correctly deduced that one of these valves was leaking, causing the increased temperature. To evaluate the high temperature, and eliminate the leakage to the Pressurizer Relief Tank, the operator closed PR6, and in *so doing, rendered one POPS channel inoperable. Action Statement 3.4.9.3.a wa~ entered at 1415 hours0.0164 days <br />0.393 hours <br />0.00234 weeks <br />5.384075e-4 months <br />. The Action Statement was terminated at 1235 hours0.0143 days <br />0.343 hours <br />0.00204 weeks <br />4.699175e-4 months <br /> on April 20, 1981, in accordance with the

_applicability statement of Technical Specification 3.4.9.3.a.

While in hot shutdown on April 23, 1981, Action Statement 3.4.9.3.a was re-entered at 0915 hours0.0106 days <br />0.254 hours <br />0.00151 weeks <br />3.481575e-4 months <br /> because the Reactor Coolant temperature was less than 312°F and the POPS channel was still inoperable because 2PR6 was closed. The Action Statement was terminated at 0808 hours0.00935 days <br />0.224 hours <br />0.00134 weeks <br />3.07444e-4 months <br /> on April 26, 1981 when the Reactor Coolant temperature increased to > 312°F.

• While in hot shutdown on April 29, 1981, Action Statement 3.4.9.3.a was again re-entered at 0349 hours0.00404 days <br />0.0969 hours <br />5.770503e-4 weeks <br />1.327945e-4 months <br />. Reactor Coolant temperature had decreased to < 312°F and 2PR6 was still closed. The Action State-ment was terminated at 1435 hours0.0166 days <br />0.399 hours <br />0.00237 weeks <br />5.460175e-4 months <br /> on May 4, 1981, when the POPS channel was declared operational.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Equipment Failure - The stem and cage of valve 2PR1 were found to be seized and galled. This caused the valve to leak.

LER 81-06/03L 5/18/81 ANALYSIS OF OCCURRENCE:

Technical Specification 3.4.9.3.a requires that with one POPS inoperable, either restore the inoperable POPS to operable status within 7 days or depressurize and vent the RCS through a 3.14 square in.vent(s) within the next 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />; maintain the RCS in a vented condition until both POPS have been restored to operable status. However, this is applicable only when the temperature of one or more of the RCS cold legs is less than 312°F.

With PR6 closed, the POPS channel was inoperable only when the Reactor Coolant temperature dropped below 312°F. While 2PR47 and 2PR1 were being inspected and repaired, 2PR6 had to remain closed to isolate them. Changes in Reactor Coolant temperature necessitated entering the Action Statement three times before the repairs were completed.

CORRECTIVE ACTION:

The stem.and cage of PRl were replaced in kind.

FAILURE DATA:

Copes Vulcan Air Operated Control Valve Type Dl00-160-2.5 Serial #10-95001-201 Prepared By W. J. Steele SORC Meeting No. 81-36