05000219/LER-1983-014, Forwards LER 83-014/01T-0.Detailed Event Analysis Encl

Forwards LER 83-014/01T-0.Detailed Event Analysis Encl

ML20073R097
Person / Time
Site:	Oyster Creek
Issue date:	04/20/1983
From:	Fiedler P GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20073R098	List: 05000219/LER-1983-014, Forwards LER 83-014/01T-0.Detailed Event Analysis Encl 05000219/LER-1983-014-01, /01T-0:on 830406,design Deficiency Discovered in Heating Coil Control Circuitry for Standby Gas Treatment Sys Trains.Temporary Redundant Power Feed Provided Until Permanent Mod Installed During Current Maint Outage
References
NUDOCS 8305030441
Download: ML20073R097 (3)

LER-1983-014, Forwards LER 83-014/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
2191983014R00 - NRC Website

text

! '

W' s

GPU Nuclear g

gf P.O. Box 388 Forked River, New Jersey 08731 609-693-6000 Writer's Direct Dial Number:

April 20, 1983 Regional Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19405

Dear Sir:

Subj ect: Oyster Creek Nuclear Generating Station Docket No. 50-219 Licensee Event Report Reportable Occurrence No. 50-219/83-14/01T This letter forwards three copies of a Licensee Event Report (LER) to report Reportable Occurrence No. 50-219/83-14/01T in compliance with paragraph 6.9.2.a.9 of the Technical Specifications.

Very truly yours, e

fyy, 2>J1,11 Peter B. Fiedler

~

Vice President and Director Oyster Creek PBF:jal Enclosure s cc: Director (40 copies)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Dire ctor (3)

Of fice of Management Information and Program Control U.S. Nuclear Regulatory Commission Washington, D.C.

20555 NRC Resident Inspector

(

Oyster Creek Nuclear Generating Station Forked River, NJ 08731 8305030441 830420 PDR ADOCK 05000219 S

PDR GPU Nuclear is a part of the General Public Utilities Systern p

t-1 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportabir Occurrence No. 50-219/83-14/01T Report Date April 20, 1983 Occurrence Date April 6,1983 Identification of Occurrence Discovery of a design deficiency which would have resulted in not meeting a Limiting Condition for Operation as defined in the Technical Specificationn, paragraph 3.5.B.

This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.a.9.

1 Conditions Prior to Occurrence 4

Mode Switch Refuel Thenmal Power 0 MWt Generator Load 0 MWe 0

Reactor Coolant Temperature 4212 F

- Description of Occurrence On Wednesday, April 6,1983, af ter an investigation of the Standby Gas Treatment System (SGTS), a design deficiency was discovered.

Apparent Cause of Occurrence The cause of the occurrence is attributed to a design deficiency in the control power circuitry for the heating coils in the SGTS.

Analysis of Occurrence The SGTS filters and exhausts the Reactor Building atmosphere to the stack in the event of certain accident situations in order. to minimize the release of radioactive materials to the environment.

~.

1-Licensee Event Report Page 2 Reportable Occurrence No. 50-219/83-14/01T Heating coils are provided in each SGTS train. The heating coils are designed L

to reduce the humidity in the air stream to 70% relative humidity.

The SGTS consts,ts of two parallel trains of filters and fans, each designed to be capable of 99% efficiency in retaining radioactive iodine and particulates that may be present in the Reactor Building during and af ter an accident.

Presently, control circuitry for heating coils in both SGTS trains receive their 120V AC power from Motor Control Center (MCC) 1A24.

If, during an accident situation, the SCTS is called for and Diesel Genere. tor No.1 failed, while supplying the power to the heating coil control circuitry, SCTS charcoal filter efficiency would be reduced.

Corrective Action

As immediate corrective action, a temporary power feed will be installed which i

will supply SGTS II's heating coil f rom MCC IB24 and leave SGTS I's heating coil supplied by MCC 1A24 thus providing redundant power sources.

A permanent modification will be installed during the current refueling / maintenance outage.

n I

e 1

i I

r t