ML20011A553

LER 81-007/03L-0:on 810902,boric Acid Heat Trace Circuit P131 Found Inoperative.Caused by Failed Fuse Holder.Fuse Holder Replaced & Boric Acid Heat Trace Circuit Returned to Svc

ML20011A553
Person / Time
Site:	Point Beach
Issue date:	10/01/1981
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20011A549	List: ML20011A548 ML20011A553
References
LER-81-007-03L, LER-81-7-3L, NUDOCS 8110130548
Download: ML20011A553 (2)

Text

NRC F ORM 366 U. S. NUCLEAR REGULATORY COMMISSION 87-7 7)

. LICENSEE EVENT REPORT CONTROL BLOCK: l i

l l l l l slh (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATIONI o 1 7 8 9 l Wl IlLICENSEE P l BCODE l H l 214l@l15 0 l 0 l - l 0 lLICENSE 0 l 0 NUMBER l 0 l 0 l - l 0 l 0 26l@l264 l 1LICENSE l 1 l 1TYPEl 1JOl@l$ 7 C lA T 68l@

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 121 l On 9-2-81 at 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> , during normal plant operations, Unit 2 boric l g o i 3, l acid heat trace circuit P-131 was found inoperative. Circuit P-131 is l io l4 l l 1 of 2 heat trace circuits for an alternate boration line to the l

[ o I s l l charging pump suction. Failure of 1 of the 2 channels of heat tracing l IO l6 l l is reportable in accordance with T.S. 15.6.9.2.B.2 as a condition l l o l 7 l l leading to operatioh in a degraded mode permitted by a LCO. l 10181I l 7 8 9 80 DE CODE S BC E COMPONENT CODE SUBCODE SU E 10191 7 rs l Pl C10l @ (_E, j @12[_A_j @13 l C l K l T l B l R18 l K l@

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li l0 l l The loss of boric acid heat trace circuit was due to a failed fuse l i , l holder. The fuse holder was replaced and the boric acid heat trace l

, 7 l circuit was returned to service at 10 38 hours4.398148e-4 days <br />0.0106 hours <br />6.283069e-5 weeks <br />1.4459e-5 months <br /> on 9-3-81. l

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PERSONN E L INJURIES i

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NAME OF PREPARER C. . Fay PH ON E: __

414/277-2811 {

a ATTACHMENT TO LICENSEE EVENT REPORT NO. 81-007/03L-0 Wisconsin Electric Power Company Point Beach Nuclear Plant, Unit 2 Docket No. 50-301 On September 2, 1981 at 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> during normal plant operations, Unit 2 boric acid heat trace circuit P-131 i was found inoperative. Circuit P-131 is the primary circuit of two heat trace circults for a manually controlled alternate boration line to the charging pump suction. There exists four flow paths for borated water to the charging pump suction.

Three of these flow paths are 'ren.otely controlled from the control roon and one is controlled locally by manual operation of isolation valves. The manual path which is serviced by heat trace circait P-131 is not used for either t normal or emergency operation of the CVCS and remains isolated during plant operation.

Failure of one of the two channels of-heat tracing for a concentrated boric acid flow path that cannot be recirculated is reportable in accordance with Technical Speci-fication 15.6.9.2.B.2 as a condition leading to operation in a degraded mode permitted by a limiting condition of operation.

At no time during this occurrence was the public' endangered.

The loss of boric acid heat trace circuit P-131 was due to a failed fuse holder. The nameplate data for the fuse holder are as follows:

Manut3cturer: Buss Type: HKP-HH Rating: 30 amps The fuse holder was replaced and the boric acid heat trace circuit was returned to service at 1038 hours0.012 days <br />0.288 hours <br />0.00172 weeks <br />3.94959e-4 months <br /> on September 3, 1981.