05000272/LER-1982-059, Forwards LER 82-059/03L-0.Detailed Event Analysis Encl

Forwards LER 82-059/03L-0.Detailed Event Analysis Encl

ML20027B163
Person / Time
Site:	Salem
Issue date:	08/25/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20027B164	List: 05000272/LER-1982-059, Forwards LER 82-059/03L-0.Detailed Event Analysis Encl 05000272/LER-1982-059-03, /03L-0:on 820809,source Range Neutron Flux Channel 1N31 Indication Failed Low.Channel Declared Inoperable Since Reactor Trip Breakers Open.Caused by Failure of High Voltage Power Supply.Power Supply Replaced
References
NUDOCS 8209160497
Download: ML20027B163 (3)

LER-1982-059, Forwards LER 82-059/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2721982059R00 - NRC Website

text

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'O PSEG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 l

Salem Generating station August 25, 1982 Mr.

R.

C.

Haynes Regional Administrator USNRC Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Haynes:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 82-059/03L Pursuant to the requirements of Salem Generating Station Unit No.

1, Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 82-059/03L.

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

Sincerely yours, l

H.

J.

Midura General Manager -

Salem Operations RF:ks Jp CC:

Distribution i

8209160497 820825 PDR ADOCK 05000 S

The Energy People gf,.#

95 218') (20V) 1181

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Report Number:

82-059/03L Report Date:

08-25-82 Occurrence Date:

08-09-82 Facility:

Salem Generating Station, Unit 1 Public Service Electric & Gas Company.

Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Source Range Neutron Flux Channel 1N31 - Inoperable.

This report was initiated by Incident Report 82-223.

CONDITIONS PRIOR TO OCCURRENCE:

Mode III - Rx Power 0% - Unit Load 0 MWe.

DESCRIPTION OF OCCURRENCE:

At 1750 hours0.0203 days <br />0.486 hours <br />0.00289 weeks <br />6.65875e-4 months <br />, August 9, 1982, during routine operation, the Control. Room Operator discovered that Source Range Neutron Flux Channel 1N31 indication had failed to the low d

end of the scale.

The Loss of Detector Voltage alarm on the channel drawer was also observed, and the channel wat declared inoperable.

At the time of the occurrence, however, the Reactor Trip System breakers were in the open position, and operability of the channel was not required by the Technical Specifications.

At 1842 hours0.0213 days <br />0.512 hours <br />0.00305 weeks <br />7.00881e-4 months <br />, the reactor trip breakers were closed, and the Control Rod Drive System was capable of rod withdrawal.

With Channel 1N31 still inoperable, Limiting l

Condition for Operation 3.3.1.1 Action 4a became applicable l

and was entered.

The redundant source range channel was_y1 operable and the thermal power was maintained below 6X10 amps in the intermediate neutron flux range (Setpoint P-6) throughout the occurrence.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The failure of the source range channel was due to a failed high voltage power supply.

No recent failures of the supply have been noted, and the problem was assumed to be of an isolated nature.

LER 82-059/03L,

ANALYSIS OF OCCURRENCE:

Operability of the source range neutron flux instrumentation is necessary to provide shutdown flux monitoring capabilities.

The channel also provides a reactor trip in the event of a power excursion initiated from below the point of adding of heat to the Reactor Coolant System.

Proper operation of the trip function is consistent with assumptions used in accident analyses in the FSAR.

Since the redundant trip function was operable, no risk to the health or safety of the public was involved.

The occurrence constituted operation in a degraded mode permitted by a limiting condition for operation,.and 1s repertable in accordance with Technical Specification 6.9.1.9.b.

Limiting Condition for Operation 3.3.1.1 Action 4a requires:

With the number of operable channels one less than the minimum channels required and with the thermal power below setpoint P-6, restore the inoperable channel to operable status prior to increasing thermal power above setpoint P-6.

CORRECTIVE ACTION

l As noted, thermal power was maintained below Setpoint P-6, in compliance with the action statement.

The failed high voltage power supply was replaced with a spare, and the output was adjusted to the required voltage.

Channel 1N31 was declared operable at 1950 hours0.0226 days <br />0.542 hours <br />0.00322 weeks <br />7.41975e-4 months <br />, August 9, 1982, and Limiting Condition for Operation 3.3.1.1 Action 4a - was terminated.

No further action'was deemed necessary in view of the isolated nature of the occurrence.

FAILURE DATA:

Westinghouse Electric Corp.

1 Source Range Power Supply i

Folio No. 402632 i

i Prepared By R.

Frahm

/

)

ed General Manager -

SORC Meeting No.

82-78 i

4

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