05000311/LER-1981-101, Forwards LER 81-101/03X-1.Detailed Event Analysis Encl

Forwards LER 81-101/03X-1.Detailed Event Analysis Encl

ML20032C703
Person / Time
Site:	Salem
Issue date:	10/28/1981
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20032C704	List: 05000311/LER-1981-101, Forwards LER 81-101/03X-1.Detailed Event Analysis Encl 05000311/LER-1981-101-03, /03X-1:on 810906,due to Momentary Loss of Power & Failure of Backup Power Pack,Radiation Monitor 2R12A Setpoints,Warning,Failure & Alarm All Failed High.Caused by Failure of Batteries in Backup Power Pack
References
NUDOCS 8111100756
Download: ML20032C703 (3)

LER-1981-101, Forwards LER 81-101/03X-1.Detailed Event Analysis Encl

Event date:
Report date:
3111981101R00 - NRC Website

text

p:

dLC O PSEG

'Pu"blic Service Electric and Gas C,mpany P.O. Box 168 Hancocks Bridge, New Jersey 08038 Salem Generating Stati.>n October 28, 1981 Ms, h1 Mr.

R. C. Haynes Director of.USNRC [T. <f v

I I9)

Office of Inspection and Enforcement Q'

t10 N g 196 F Z..

Region 1 g $/

631 Park Avenue

-+

King of Prussia, Pennsylvania 19406

... @*ssd

Dear Mr. Haynes:

1

@h'

/

LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 81-101/03X-1 SUPPLEMENTAL REPORT Pursuant to the requirements of Salem Generating Station Unit No. 2 Technical Specifications, Section 6.9.1.9.b, we are submitting supplemental Licensee Event Report for Reportable Occurrence-81-101/03X-1.

Sincerely yours,

/

,14hbwd H. J. Midura General Manager -

Salem Operations CC:

Distribution hhfg O

PDR The Energy People 9s 2is9 02 m u so b

6hi 1

r/l

f Report Number:

81-101/03X-1 Report Date:

10-28-81 Occurrence Date:

9-6-81 Facility:

Salem Generating Station, Unit 2 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Radiation Monitor 2R12A - Loss of Power.

This report was initiated by Incident Report 81-367.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 88% - Unit Load 1000 MWe DESCRIPTION OF OCCURRENCE:

On September 6, 1981, due to a momentary loss of power in conjunction with failure of the backup power pack, Radiation Monitor 2R12A setpoints, warning, failure, and alarm, all failed high.

At 2400 hours0.0278 days <br />0.667 hours <br />0.00397 weeks <br />9.132e-4 months <br />, September 6, 1981 Action Statement 3.3.3.1.a was entered.

This occurrence constituted operation in a degraded mode in accordance with technical specification 6.9.1.9.b.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Design error.

The reason the setpoints failed high on a momentary power loss was failure of the four 1.2 volt nickel-cadmium batteries in the backup power pack.

The manufacturer recommends no more than three batteries in the power pack to prevent overcharging.

The four battery system allows the batteries to overcharge and short internally.

ANALYSIS OF OCCURRENCE:

Technical specification 3.3.3.1.a requires:

With a radiation monitoring channel alarm / trip setpoint exceeding the value shown in table 3.3-6, adjust the setpoint to within the limit within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or declare i

the channel inoperable.

t l

l

r LER 81-101/03X-1.

CORRECTIVE ACTION

The batteries were replaced in the backup power pack and the setpoints were reinstated in the Radiation Monitor.

It was tested satisfactorily and returned to service.

At 0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br />, September 9, 1981 Action Statement 3.3.3.1.a was terminated.

A DCR is in effect to modify all power packs to three batteries.

Modifications are in progress.

Batteries are tested every 18 months during scheduled calibration.

FAILURE DATA:

Victoreen Instrument Division M868B Power Supply Prepared By F.

Dickey

// k%g./E[W Generdl Ma' nager -

Salem Operations SORC Meeting No.81-112 l

l i

l l

t t

l