ML18139B215

Updated LER 80-020/01X-1:on 800310,heat Tracing Circuits 24A,B & C for Unit Boric Acid Filter Sys Found Tagged Out of Svc Since 800211,during Review of Penetrant Test 27B.Caused by Error During Maint on Unit 1 Drain Line

ML18139B215
Person / Time
Site:	Surry
Issue date:	03/27/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B212	List: ML18139B211 ML18139B213 ML18139B214 ML18139B215 ML18139B216
References
LER-80-020-01X, LER-80-20-1X, NUDOCS 8104020640
Download: ML18139B215 (2)

Text

N~C FORM 366

• U.S. NUCLEAR RE~ULATORY COMMISSION

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UPDATE REPORT e LICENSEE EVENT REPORT PREVIO.EPORT DATE 03-24-80 I

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VENT DESCRIPTION ANO PROBABLE CONSEQUENCES @

jDuring the review of PT 27B, Heat Tracing Circuit Monthly Check. it was discovered

[]JI] J that heat tracing circuits 24A, B, & C (Panels 8 and 9) for the Unit Boric Acid

[))TI_ !Filter System had been tagged out of service since 2/11/80. This is contnt.:x. JP . _J__ _

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I Performing the tag-out necessary to effect repairs on circuit 24B (Panels B & C), Unit!

JIID 1 Boric Acid Filter Drain Line,. all three circuits were inadvertent] y tagzed out of service. Since, at the time of discovery, the unit was a-t cold shu.tdown, no immediate!

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e ATTACHMENT, PAGE 1 OF 1 SURRY POWER STATION, UNIT 1 REPORT NO: 80-020/0lX-1 EVENT DATE: 03-10-80 TITLE OF EVENT: HEAT TRACING CIRCUITS OUT OF SERVICE

1. DESCRIPTION OF EVENT:

During the review of PT-27B, Heat Tracing Circuit Monthly Check, it was discovered that Heat Tracing Circuits ~24_A, B & C (Panels 8 and 9) for the Unit 1 Boric Acid Filter System has been tagged out of service since 2-11-80.

This is contrary to T.S. 3.2.a.5 and reportable per T.S. 6.6.2.a.2.

2. PROBABLE CONSEQUENCES & STATUS OF REDUNDANT SYSTEMS:

Normal operation verified that the required flow paths were operable, therefore, the health and safety of the public were not affected.

3. CAUSE:

In performing the tag-out necessary to affect repairs on circuit 24B (Panels B & C) Unit 1 Boric Acid Filter Drain Line, all three circuits were inadvertently tagged out of service.

4. IMMEDIATE CORRECTIVE ACTION:

The two circuits of heat tracing that are required by Tech. Specs. were immediately energized and flow verified.

5. SUBSEQUENT CORRECTIVE ACTION:

Prior to unit startup, all circuits will be repaired and verified operable. The Boric Acid leak will be repaired.

6. ACTION TAKEN TO PREVENT RECURRENCE:

The program of review for tagging out of electrical equipment has been stressed to the people involved and no further action is deemed necessary.

7. GENERIC IMPLICATIONS:

A task force has been established to study the total spectrum of the heat tracing system in an attempt to discern present problems and recommended solutions which will eliminate the failures experienced. While this study is in progress, a new type of Heat Tracing Tape is being used which has thus far proven resistant to failure.