ML18113A575

LER 78-032/03L-0:on 780921,heat Tracing Circuit Manual Boration/Boric acid-to-blender Failed.Caused by Boric Acid Penetration of Heat Tracing Tape Circuits.Heat Tracing Tape Replaced

ML18113A575
Person / Time
Site:	Surry
Issue date:	10/12/1978
From:	Baucom T VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18113A574	List: ML18113A573 ML18113A575
References
LER-78-032-03L, LER-78-32-3L, NUDOCS 7810230262
Download: ML18113A575 (3)

Text

NRC: FORM.,366 e e U.S. NUCLEAR REGULATORY COMMISSION (7-77)" ,'

• L-ICENSEE EVENT REPORT CONTROL BLOCK: L..1_.._____.__ _,.____,__ l r.i"\

_,____,6 \._V (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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~~~~! ~©I OI 5 1o I O I o J 2 18 11 68101° 19 12 11 17 18 IG)l 1 l o I 11 2 ! 1 I a8010 60 61 DOCKET NUMBER 69 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@ -

I During normal operation, routine test revealed the. failure. of heat tracing circuit 6A (Panel ;Ll) Unit f/2 manual boration/boric acid-to-blender line. This event is contrary to T.S. 3.2.B.5, and is reportable as per T.S. 6.6.2.b.(2). The health

~ I and safety of the general public were not affected.

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~REPORT NUMBER 17 18 I 21 22 I

23 I 101312 h_,,_ 1.......-1 24 26 ' 27 10131 28 29 L!J JO I I 31 L2J 32 ACTION FUTURE EFF::CT SHUTDOWN r.;::;,. ATTACHMENT NPRD-4 PRIME C.OMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS ~ .. SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

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~ !A review of the heat tracing circuit showed that failure was caused by boric acid penetration of the heat tracing tape circuits. The corrective action implemented was to replace the heat tracing tape.

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7 8 9 11 12 13 80 PERSONNEL INJURIES Q NUMBER DE5CRIPTION6

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8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY '4J'I TYPE DESCRIPTION ~

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" Attachment (Page 1 o f -

Surry Power Station, Unit 2 e

Docket No: 50-281 Report No: 78-032/03L-O Event Date: 9/21/78 Heat Tracing Low Current

1. Description of Event:

With the unit in normal operation at rated power, routine surveillance indicated that heat tracing circuit 6A (Panel 11) was operating at less than the current specified in the surveillance document. No low temperature alarm was indicated.

Investigation for faulty heat tracing tape was initiated on the affected circuit. Faults were found on circuit 6A (Panel 11) Unit #2 serving manual boration and boric acid-to-blender bypass lines and were identified as being the result of boric acid attack on tape. The tape was replaced and circuit current verified to within specs of surveillance document.

The event constitutes a condition contrary to Technical Specification 3.2.B.S and is reportable in accordance with Technical Specification 6.6.2.b.(2).

2. Probable Consequences/Status of Redundant Systems:

• -~

At all times during the event; the temperature in the piping served by the affected circuit was maintained as required. The *redundant circuit was operable. Tnere were at all times two operable flow paths for boric acid to the reactor. Therefore, the health and safety of the public were not affected.

3. Cause:

The reduced currents were due to boric acid damage to the heat tracing tape on the affected circuits.

4. Immediate Corrective Action:

The faults detected were repaired.

5./-~cheduled Corrective Action:

• The problem was corrected inuriediately and no further action is required.

6. Action Taken To Prevent Recurrence:

Continuous surveillance is maintained on the heat tracing systems as required for unit 0pertition. No additional action is considered necessary.

., .,;,.t~achment (Page 2 ow e Surry Power Station~ Unit 2 Docket No: 50-281 Report No: 78-032/03L-0 Event Date: 9/21/78 Heat Tracing Low Circuit (Continued)

7. Generic Implications:

This failure, as with others in the system, is considered random since no specific circuit or panel has exhibited repeated failure.