ML20084S515

RO 50-254/76-28:on 760809,position Indication Lost on Reactor Water Cleanup Sys Isolation Valve Mo 1-1201-2.Caused by Relay 595-125 Shorting Out & Burning Up Control Transformer.Relay & Transformer Replaced

ML20084S515
Person / Time
Site:	Quad Cities
Issue date:	09/07/1976
From:	Kalivianakis N, Swales J COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NJK-76-328, RO-50-254-76-28, NUDOCS 8306170080
Download: ML20084S515 (3)

Text

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. . Co e:lth Edison

-Quad-Cities Nuclear Power Station E pgy C()PT Post Office Box 216 Corcova. Ithnois 61242

• Telephone 30?!654-2241

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Wyy sgg E \ ;j September 7, 1976 .-

l' J. Keppler, Regional Director Office of Inspection and Enforcement Region ill U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Reference:

Quad-Cities Nuclear Power Station Docket No. 50-254, DPR-29, Unit 1 Appendix A, Sections 3.7.D.1, 6.6.B.2.b Enclosed please find Reportable Occurrence Report No. 50-254/76-28 for Quad-Cities Nuclear Power Station.

This report is submitted to you in accordance with the requirements of Technical Specification 6.6.B.2.

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION f l , ~==

/ f ' 'WEff N. J. Kalivianakis Station Superintendent NJK/JAS/lk

_ cc: G. A. Abrell

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C,U LICENSEE EVENT MT

, CONTROL BLOCK:l l l l l l l (PLEASE PRINT ALL REQUIRED INFORMATioN) 1 8 NAME LCENSE NUMBER E TYPE 01 li lt 10 l Al Dl 1l l0 l0 l-l 0 l 0 l 0 l 0 l 0l--l0 l0 l l4 l1 l1 l1 l1l l0 l3 l 7 89 14 15 25 26 30 31 32 CATEGORY T f) DOCKET NUMBER EVENT DATE REPORT OATE 7 8 O CONT l 57 l

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59 W60 l015 lo l-10 l 2 l 5 l 4 l 61 68 l 0l 8l Ol 91 7l 6 l 69 74 lo 19 10 17 l7 l 6 l 75 80 EVENT DESCRIPTION gg l At 5:00 pm on August 9, 1976 position Indication was lost on Reactor Water Cleanup l 7 89 80 HE I System isolation valve MO l-1201-2. in-line valve MO 1-1201-5 was immediately closed l 7 89 80 Q l In accordanCe with Technical Specification 3.7.D.2. Upon Investigation it was found l 7 89 80 DE l that the control transformer for valve MO 1-1201-2 was burned out. Primary Containment l 7 89 80 Q l Isolation Relay 595-125 was.also burned out. Work Request 2902-76 was issued and the l i 7 89 mg 80 DE CODE COMPONENT CODE SUPPUER VIOLATON 35lClGl W 7 89 10 11 lC l Kl Tl RlR lK l 12 17 lNl 43 lGl0l8l0l 44 47 lN l 48 CAUSE DESCRIPTION DE l (Proximate Cause-Equipment Failure) Inoperability of Reactor Water Cleanup System l 7 89 80

@ l Isolation Valve MO l-1201-2 was caused by relay 595-1.25 shorting out and then burning l 7 89 80 DE l uo the cnntrol transformer. I STA S  % POWER OTHER STATUS OtSC VERY DISCOVERY DESCRIPTON 1

(F_] l0 l7 l5 l l NA l {45 l NA l 7 8 9 10 12 13 44 46 80 R LE SEO OF E AMOUNT OF ACTMTV LOCATON OF RELEASE 35 tz_j Iz_]ASEl NA l l NA l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTON EE l 0l 0l 0 l l_Zj l NA l 7 89 11 12 13 80 PERSONNEL INJURIES NUMBER DESCRIPTON

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7 89 11 12 80 OFFSITE CONSEOUENCES DE l NA l 7 89 80 LOSS OR OAMAGE TO FACIUTY TYPE DESCAIPTON

@dl 7 89 10 NA .

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PUBLICITY DE l NA l l 7 89 80 ADOITIONAL FACTORS D@ l (Event Desc. cont) relay and transformer were replaced within 150 minutes. valves l 7 89 80 QE l MO l-1201-5 and Mc l-1201-80 were fully operable and would have Isolated the Cleanup l 7 89 80 NAME: James A. Swales '#'

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L. ' . OO OO ADDITIONA'L FACTORS System had a Group 111 Isolation condition been received. Upon return to service, MO l-1201-2 was tested satisfactorily for operability. The corrective action taken is felt to be adequate to prevent recurrence. This is the first failure of this valve; however, MO 2-1201-2 experienced a torque switch failure in December 1974. (R0 50-254/76-28) 8 um