05000272/LER-1981-120, Forwards LER 81-120/03X-1.Detailed Event Analysis Encl

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Forwards LER 81-120/03X-1.Detailed Event Analysis Encl
ML20054D137
Person / Time
Site: Salem PSEG icon.png
Issue date: 04/02/1982
From: Midura H
Public Service Enterprise Group
To: Haynes R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20054D138 List:
References
NUDOCS 8204220373
Download: ML20054D137 (3)


LER-2081-120, Forwards LER 81-120/03X-1.Detailed Event Analysis Encl
Event date:
Report date:
2722081120R00 - NRC Website

text

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O O PSIEG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station April 2, 1982

@ A ,~

S Mr. R. C. Haynes Regional Administrator Ofifyg USNRC ._

4 Region 1

{,. 4 Apg02 /g 631 Park Avenue (7)

King of Prussia, Pennsylvania 19406

//

Deer Mr. Haynes LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 81-120/03X-1 SUPPLEMENTAL REPORT Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1.9.b, we are submitting supplemental Licensee Event Report for Reportable Occurrence 81-120/03X-1.

Sincerely yours, lrh, "

H. J. Midura General Manager -

Salem Operations FD:ks

CC
Distribution l

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l 8204220373 820402 PDR ADOCK 05000272 S PDR )

The Energy People g 'l

% 2189 (20M; 1181 1

1 Report Number: 81-120/03X-1 Report Date: 04-02-82 Occurrence Date: 12-22-81 Facility: Salem Generating Station, Unit 1 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Boric Acid Storage Tank Level Indicators - Nitrogen Header Pressure Low.

This report was initiated by Incident Report 81-510.

CONDITIONS PRIOR TO OCCURRENCE:

i Mode 1 - Rx Power 66% - Unit Load 700 MWe DESCRIPTION OF OCCURRENCE:

On December 22, 1981, the be.Sel indicators for the Boric Acid Storage Tank (B AST) levels dropped to a 10% reading due to loss of ' nitrogen j header pressure, caused by depletion of the low pressure nitrogen supply. At 1415 hours0.0164 days <br />0.393 hours <br />0.00234 weeks <br />5.384075e-4 months <br /> No. 11 and 12 BAST were declared inoperable y and Action Statements 3.1.2.8.a and 3.3.3.7.a table 3.3-11b, Action 2 were 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:

Loss of the BAST level was caused by depletion of the low pressure nitrogen supply.

ANALYSIS OF OCCURRENCE:

Technical Specification 3.1.2.8.a requires:

With the boric acid storage system inoperable, restore the storage system to operable status within 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />s-or be in at least hot i

! standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and borated to a shutdown margin equivalent to at-least 1% WK/K at 200oF.

Technical Specification 3.3.3.7.a table 3.3-llb Action 2 requires:

with the number of operable accident monitoring channels less than

. the minimum number of channels shown in table 3.3-llb, restore the

, inoperable channels to operable status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in i hot shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

4

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l LER 81-120/03X-1 l CORRECTIVE ACTION: ,

Because the normal nitrogen supply tank was depleted, the shift supervisor switched the supply to the backup tank which had a pressure of 50 PSIG. The BAST level indicators were restored, but due to the low nitrogen pressure, were considered unreliable.

The high pressure nitrogen backup supply was then connected through a regulator to the indicator bubblers. At 1835 hours0.0212 days <br />0.51 hours <br />0.00303 weeks <br />6.982175e-4 months <br />, proper BAST level indication was restored, the BAST's were declared operable, and Action Statements 3.1.2.8.a and 3.3.3.7.a table 3.3-11b Action 2 were terminated.

Subsequently, the low pressure nitrogen tanks were refilled and the system was restored to the normal lineup.

An instruction was issued to all shifts delineating the importance of proper low pressure nitrogen management and the necessity to reorder nitrogen in a timely manner.

FAILURE DATA:

Low Pressure Nitrogen Supply Prepared By F. Dickey /c Geher41 Ma' nager -

Salem Operations SORC Meeting No. 82-07

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