05000281/LER-1980-027-03, /03L-0:on 801005,w/unit at 100% power,PT-27B Revealed That Amp Reading for Circuit 6A,boric Acid to Blender,Panel 11 Was Below Acceptance Criteria.Caused by Failure of Heat Tracing Tape Due to Excessive Heat

/03L-0:on 801005,w/unit at 100% power,PT-27B Revealed That Amp Reading for Circuit 6A,boric Acid to Blender,Panel 11 Was Below Acceptance Criteria.Caused by Failure of Heat Tracing Tape Due to Excessive Heat

ML18139A799
Person / Time
Site:	Surry
Issue date:	10/31/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A796	List: 05000281/LER-1980-023-03, /03L-0:on 801003,while Operating at 100% Power, During Periodic Test 27D,low Amp Readings Found on Circuit 1B,panels 10 & 11,causing Valve MOV-2867D to Be Considered Inoperable.Caused by Damaged Heat Tracing Tapes 05000281/LER-1980-026-03, /03L-0:on 801005,w/reactor at 100% Power & Redundant Low Head Safety Injection Pump Out of Svc for Maint,Operator Failed to Retest Operable Pump 2-SI-P-1a within Specified Time.Caused by Operator Oversight 05000281/LER-1980-027-03, /03L-0:on 801005,w/unit at 100% power,PT-27B Revealed That Amp Reading for Circuit 6A,boric Acid to Blender,Panel 11 Was Below Acceptance Criteria.Caused by Failure of Heat Tracing Tape Due to Excessive Heat ML18139A795
References
LER-80-027-03L-02, LER-80-27-3L-2, NUDOCS 8011040592
Download: ML18139A799 (2)

LER-1980-027, /03L-0:on 801005,w/unit at 100% power,PT-27B Revealed That Amp Reading for Circuit 6A,boric Acid to Blender,Panel 11 Was Below Acceptance Criteria.Caused by Failure of Heat Tracing Tape Due to Excessive Heat

Event date:
Report date:
2811980027R03 - NRC Website

text

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I With Unit 2 at 100% power, PT-27B revealed that the amp reading for circuit 6A, boric acid to blender, Panel 11 was below the Acceptance Criteria stipulated in the

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Repair of the defective circuit was initiated irmnediately.

This event is a degraded mode of operation as specified in T.S.-3.2.D.3 and is reportable in accordance with T.S-6.6.2.b(2).

The redundant heat tape channel was functioning r::IlD maintaining solubility of the boric acid,therefore the health and safety of the

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40 41 42 43 l The heat tracing tape failed due to excessive heat.

A design change has been initiated to change the manner by which these borated lines are heat traced.

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e ATTACHMENT 1 SURRY POWER STATION, UNIT 2 DOCKET NO: 50-281 REPORT NO: 80-027 /03L-O EVENT DATE:10-05-80 TITLE OF REPORT:

1.

Description of Event

e HEAT TRACING FAILURE With Unit ://:2 at 100 percent power PT-27B revealed that the amp readings for circuit 6A (boric acid to blender) panel ://:11 were below the Acceptance Criteria stipulated in the PT.

Repair of the defective circuit was initiated immediately.

This event is a degraded mode of operation as specified in T.S.3.2.D.3 and is_ reportable in accordance with T.S.6.6.2.b(2).

2.

Probable Consequences & Status of Redundant Systems:

The Heat Tracing is intended to maintain a temperature above that needed for flow.

The redundant Heat Tracing Circuit was operable, the-refore, the health and safety of the public were not affected.

3.

Cause of Occurrence:

The Heat Tracing Tape failed due to excessive heat.

4.

Immediate Corrective Action

The immediate corrective action was to verify that the redundant circuit was operable.

5.

Subsequent Corrective Action:

The defective Heat Tracing Circuit was replaced within the time span specified by the Technical Specifications.

6.

Action Taken to Prevent Recurrence:

No additional actions were deemed necessary.

7.

Generic Implications:

A task force has reviewed the total spectrum of the Heat Tracing system and a Design Change is being prepared as a result of the Task Force Study.

Long lead items are being procured.