05000311/LER-1980-029, Forwards LER 80-029/03L-0

Forwards LER 80-029/03L-0

ML18082B275
Person / Time
Site:	Salem
Issue date:	09/29/1980
From:	Librizzi F Public Service Enterprise Group
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18082B276	List: 05000311/LER-1980-029, Forwards LER 80-029/03L-0 05000311/LER-1980-029-03, /03L-0:on 800830,during Cooldown,Channel I Pressurizer Overpressure Protection Sys Relief Valve Failed to Open.Caused by Faulty Open Limit Switch on Relief Valve. Sys Depressurized & Vented.Limit Switch Replaced
References
NUDOCS 8010060219
Download: ML18082B275 (3)

LER-1980-029, Forwards LER 80-029/03L-0

Event date:
Report date:
3111980029R00 - NRC Website

text

e PS~G Public Service Electric and Gas Company 80 Park Place Newar~. NJ 07101 Phone 201 4~~fJ-7000 September 29, 1980 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 80-29/03L 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 80-29/03L.

This report is required within thirty (30) days of the occurrence.

Sincerely yours, f /? t4,~,:~h F. P. Librl~ z J.

General Manager -

Electric Production CC:

Director, Office of Inspection and Enforcement (30 copies)

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

\\l.\\lt~IJI or..

• M.H\\111.

Report Number:

Report Date:

Occurrence Date:

Facility:

80-29/03L 9/29/80 8/30/80 Salem Generating Station, Unit 2 Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Failure of Channel I of the Pressurizer Overpressure Protection System (POPS)

CONDITIONS PRIOR TO OCCURRENCE:

Cooldown Operations Mode 4 0% Power DESCRIPTION OF OCCURRENCE:

While testing the Pressurizer Overpressure Protection System prior to placing the system in service, as required by Technical Specification 3.4.9.3, Channel I relief valve would not open.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Equipment Failure ANALYSIS OF OCCURRENCE:

Two POPS relief valves or a Reactor Coolant System vent of at least 3.14 square inches are required to be operable when the Reactor Coolant cold leg temperature is less than or equal to 312°F.

A broken open limit switch on POPS relief valve 2PR47 prevented the valve control circuitry from operating properly resulting in the limiting condition for operation being exceeded until the Reactor Coolant System could be cooled down, depressurized and vented as required by the Action Statement.

CORRECTIVE ACTION

The limit switch assembly was replaced and adjusted.

The high failure rate for this type limit switch has been previously noted (LER 80-05/03L).

There have been three limit switch failures since the present type limit switches were installed on both POPS relief valves on May 22, 1980.

LER 80-29/03L 2 -

Design Change Request 2SC-0397 was initiated on June 26, 1980, to investigate and specify improved switches.

FAILURE DATA:

Marotta Scientific Controls Valve Model MV-225C This is the third limit switch failure since May 22, 1980.

Prepared By J. M. Randolph Manager - Saleef Generating Station SORC Meeting No.

75-80