ML18139A673

LER 80-049/03L-0:on 800722,at 100% power,PT-27D Revealed Amp Readings for Circuit 13A Boron Injection Recirculation to Boric Acid Tanks Panels 8 & 9 Below PT Acceptance Criteria.Caused by Heat Tracing Tape Failure

ML18139A673
Person / Time
Site:	Surry
Issue date:	08/20/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A672	List: ML18139A671 ML18139A673 ML18139A674
References
LER-80-049-03L-01, LER-80-49-3L-1, NUDOCS 8008260591
Download: ML18139A673 (2)

Text

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J]J L WiC::::-. -;;:iit {fol at 100% powe,::- PT-27D revealed that the amp readings for circuit 13_;._ Boron ill l In.~ ==::io:i rec ire to the Ec::-ic Acid Tanks Panels 8 & 9 were below the Acceptance Criteria

]3J l Sti?~~ated in the PT. Repair of the defective circuits was initiated immediately. This

]}] L evE~t is a degraded mode of operation as specified in T.S. 3.3.b. 10 and* is reportable JI] I in ~c:ordance with T.S.6.6~2.b(2) Recirculation flow from the Boron Injection Tank was 12] L veri::::.ed, therefore the health and safety of the public were not affected,.

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[§] I Th~ E~at Tracing Tape failed because of excessive heat. A design change has been initti=.ted to chan.ge the m.ainer by which these borated lines ar~ -heat traced. The --~ *. ~,

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S"QR,_-q_y POvc.?.. ~TATION, UNIT-DOCKET NO: 50-280 REPORT NO: 80-049/03L-0 EVENT DAT==: 7-22-80 TITLE OF :S?ORT: HEAT TRACING FAILURE

1. Descri~:ion of Event:

With Snit #1 at 100 percent power PT-27D revealed that t+/-:e E:J.P readings for circuit 13A (Boron Injection Recirculation to the Bo=ic Acid Tanks)

Panels S &9 were below the Acceptance Criteria Stipulated in the PT.

Repair of the* defective circuit was initiated immediatel?. This event is_ a degraded mode of operation as specified in T. S. 3. 3. 5. 3..0 and is repor~able in accordance with T.S.6.6.2.b(2)

2. Proba~le Consequences & Status of Redundant Systems:

E2circulation flow from the Boron Injection Tank was _verified. Tech. Sp~c. 3.3.B.10 permits operation with the recirculation between a Unit's Boron Injection Tank anci it's Boric Acid Storage Tank _to be inoperable for a period not to exceed two hours. The heat tracing circuit was returned to service in one hour and ten minutes therefore,the health and safety of the public were not affected.

3. Cause:

The Heat Tracing Tape failed due to excessive heat~

4. Immediate Corrective Action:

The iZ!1Illediate corrective action was to replace the defective Heat Tracing Tape, and verify the operability of the affected Heat Traciug Circuit.

5. Subsequent Corrective Action:

A Design Ch~nge has been initiated to change the Heat Tra_ci:ig Circuit 13A to prevent over heating.

6. Action Taken to Prevent Recurrence:

No additional actions ,were deemed necessary.

7. Generic Implications:

A tas}~ ::orce has been established to study the total spe.2t::-..:w of the heat tr;;.cing system in an attempt to discern present proDl2:i.s and recor:oe~d solutions which will eliminate sporadic failur=s ~xperienced.

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