05000280/LER-1980-007-03, /03L-0:on 800116,during Normal Operation,Heat Tracing Circuit 4 on Line 1-CH-56-152,boric Acid Supply to Blender Failed.Caused by Water Penetration of Heat Tracing Tape.Tape Replaced W/Higher Water Resistant Tape

/03L-0:on 800116,during Normal Operation,Heat Tracing Circuit 4 on Line 1-CH-56-152,boric Acid Supply to Blender Failed.Caused by Water Penetration of Heat Tracing Tape.Tape Replaced W/Higher Water Resistant Tape

ML19260D961
Person / Time
Site:	Surry
Issue date:	02/11/1980
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19260D943	List: 05000280/LER-1980-005-03, /03L-0:on 800120,while Conducting PT 27D Heat Tracing Sys,Discovered That Circuit 17A Panel 9 Was Inoperative.Caused by Thermostat Failure.Maint Rept Initiated.Defective Thermostat Replaced 05000280/LER-1980-006-03, /03L-0:on 800115,during Routine Surveillance of Liquid Waste Release,Discovered That Unsampled Waste from Tank 5A Was Being Pumped to Tank 5B.Caused by Inadvertent Operation of Transfer Pump.Waste Release Terminated 05000280/LER-1980-007-03, /03L-0:on 800116,during Normal Operation,Heat Tracing Circuit 4 on Line 1-CH-56-152,boric Acid Supply to Blender Failed.Caused by Water Penetration of Heat Tracing Tape.Tape Replaced W/Higher Water Resistant Tape ML19260D942
References
LER-80-007-03L-01, LER-80-7-3L-1, NUDOCS 8002120673
Download: ML19260D961 (2)

LER-1980-007, /03L-0:on 800116,during Normal Operation,Heat Tracing Circuit 4 on Line 1-CH-56-152,boric Acid Supply to Blender Failed.Caused by Water Penetration of Heat Tracing Tape.Tape Replaced W/Higher Water Resistant Tape

Event date:
Report date:
2801980007R03 - NRC Website

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IotalI tracing circuit 4 (panels 8,9) on line 1-CH-56-152 Boric acid supply to the l blender. This is a degraded mode of operation permitted by T.S. 3.3.B.3,

.ITT'Tl l o is t and is reportable as per T.S. 6.6.2.b. (2). Since the temperature of the I

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ATTACIDtENT (PAGE 1 0F 1)

SULTRY POWER STATION, UNIT 1 DOCKET t:0; 50-280 REPORT !0: 80-007/03L-0 EVENT DATE:

1/16/80 TITLE OF ltEPORT:

Lou Current on Heat Tracing 1.

DESCl!IPTION OF EVENT:

During normal operation, routine surveillance revealed the f ailure of heat t rac in); circuit 4 (panels 8, 9) on line 1-Cll-56-152 Boric Acid supply to the blender. This is a degraded mode of operation permitted by T.S. 3.3.B.5, and is reportable as per T.S. 6.6.2.b.(2).

2.

PROBABLE CONSEQUENCES AND STATUS OF llEDUtIDANT SYSTEftS:

At all times during the event, the temperature of the affected line was maintained as required. The redundant circuit was operable. There were at all tines two operable flow paths for boric acid to the reactor.

Therefore, the health and safety of the public were not affected.

3.

CAUSE

The f ailure of the circuit was due to water penetration damage f ron previous leaka ge to the heat tracing tape on the af f ected circuit.

Lagging on the affected line was also replaced.

4.

III!fEDIATE CORRECTIVE ACTION:

The heat tracing tape was replaced with a more water resistant heat tape.

5.

SCIIEDULED CORRECTIVE ACTI0ti:_

The problen was corrected imnediately and no further action is required.

6.

ACTIO:: TAl:EN TO PREVENT RECURRENCE:

Continuous surveillance is naintained on the Ileat Tracing System.

No additional action is considered necessary.

7.

CE!FRIC I!!PLICATIONS:

A task force has been created to investigate the failures of the IIcat Tracing System.

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