ML18138A068

LER 80-012/03L-0:on 800202,while Performing PT-27D,amperage Readings for Circuit 25A,panels 1 & 2,were Below Acceptance Criteria.Repairs to Tape Not Completed within 2-h Limit.Unit Rampdown Intiated.Caused by Water Penetration

ML18138A068
Person / Time
Site:	Surry
Issue date:	02/29/1980
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18138A065	List: ML18138A064 ML18138A068
References
LER-80-012-03L-01, LER-80-12-3L-1, NUDOCS 8003040644
Download: ML18138A068 (2)

Text

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LICENSEE EVENT REPORT CONTROL BLOCK: I 1

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(PLEASS PRINT OR TYP!: ALL REQUIREO INFORMATION!

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SO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES @

!While performing PT-27D,

• the amperage readings for circuit 25.A (Boron Injection .Tank

((II] jRecirc Return Line to the Boric Acid Tanks) panels 1 and 2 were below the a~ceptance 1*

((ill jcriteria* stipulated in the PT. Since rep.airs to the tape were not *completed within

• [§JI] fthe allowable 2 hrs .. (actual repair duration,- 2 hrs .. 5 min.), unit rampdown was I

!ill] !commenced as per T.S.3.3.B.10. This event is reportable in accordance with T.S *

. r::I:II] 16. 6. 2. b. 2. The temperature, volume, and concentration of the* BIT :were yeri fi ed I

• [)))) lwithiri snecifications, therefore, the health and safetv of the -pnhJic were uat *auecreb.

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43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

o:::TIJ ~cid Flat floor,. causing the degraded amp readings. The water had. accumulated at thaq o:II] point from previous maintenance on the Flat. A Maintenance Report was initiated and

[J))J ~he section of tape replaced. The borated water accumulation in the penetration area r:IIIl eas cleaned up.

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. STATUS %POWER . OTHERSTATUS ~ DISCOVERY DISCOVERY OESCRIPT10tf '5

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PERSONNEL INJURIES ~

NUMBER DESCRIPTION~

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NAME OF PREPARER H I Ston:;u;t PHONE: (SOl1H57 '.l Hl/i

e Attachment (Page 1 of 1)

Surry Power Staiion, Unit 1 Docket No. 50-280 Report No. 80-012/031-0 Event Date: 02-02-80 .

Title of Report: Heat Tracing Circuit Low Amperage

1. Description of Event:

While performing PT-27D, the amperage readings for circuit 25A {Boron Injection Tank Recirc Return Line to the Boric Acid Tanks) panels *land 2 were below the acceptance criteria stipulated in the PT. Since repairs to the tape were not completed within the allowable 2 hrs. (actual repair duration - 2 hrs. 5 min.), unit rampdown was commenced as per T.S. 3.3.B.10.

This event is reportable in accordance with T.S. 6.6.2.b.2 ..

2'. Probable Consequences & Status of Redundant Systems:

Although the heat tracing circuit was declared inoperable in accordance with the PT, the concentration, volume, and temperature of the BIT were verified to be within the setpoints stipulated in Tech. Specs. There-fore, the health and safety of the public were not affected.

3. Cause:

Borated water had penetrated the tape in the area where the pipe penetrates the Boric Acid Flat floor, causing the degraded amp readings. The* water had accumulated at that point from previous maintenance on the flat.

4. Immediate Corrective Action:

A Maintenance Report was initiated and the suction tape replaced. The borated water ac~umulation in the penetration area was cleaned up.

5. Subsequent Corrective Action:

Since the subject circuit is continuously monitored, no subsequent action is required.

6. Action Taken to Prevent Recurrence:

The existing tape was replaced with a better grade tape which will elimi-nate future failures of a similar nature.

7. ~eneric 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 recommend 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.