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

/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

ML19260D948
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-80-005-03L-01, LER-80-5-3L-1, NUDOCS 8002120661
Download: ML19260D948 (2)

LER-1980-005, /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

Event date:
Report date:
2801980005R03 - NRC Website

text

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SURRY POUER STATION, UNIT 1 DOCKET I:0: 50-280 REPORT I;O: 80-003/03L-0 EVENT DATE: 01-20-80 TITLE OF REPORT:

Heat Tracing System Failure 1.

DESCRIPTION OF EVENT

While conducting PT 27D (Heat Tracing System) it was discovered that circuit 17A Panel 9 was inoperative. The redundant heat tracing circuit on this line to !!o. 1 Boric Acid Filte: was operable thus maintaining two flow paths to the core. This event is contrary to Tech. Spec. 3.2.B.5, allowable as a degra-ded mode of operation as outlined in 3.2.D.3, and reportable in accordance with 6.6.2.b.2.

The health and safety of the public were not af fected.

2.

PROBABLE CONSEOUENCES AND STATUS OF REDU'IDANT SYSTEliS:

The redundant circuit from Panel 8 was operable and functioned as designed.

Since two flow paths for Boric Acid feed to the core were maintained operable, the health and safety of the public were not affected.

3.

CAUSE

Investigation determined that a thermostat within the circuit had failed.

4.

IIIMEDIATE CORRECTIVE ACTION:

A maintenance report was initiated to replace the defective part.

5.

SUBSEQUE!iT CORRECTIVE'ACTIO!!:

The defective thermostat was replaced and the system declared operable.

6.

FUTURE CORRECTIVE ACTION:

None.

7.

CENERIC IIIPLICATIONS:

A task force has been established to study the total spectrum of the heat tracing system in an attempt to discern present problems and recommend solutions which will eliminate the failures experienced.

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