ML20024E927

LER 83-062/01T-0:on 830819,HPCI Motor Gear Unit Observed Moving Between High & Low Speed Stops W/O Operation Action. Caused by Failure of HPCI Controller Amplifier.Amplifier replaced.W/830830 Ltr

ML20024E927
Person / Time
Site:	Dresden
Issue date:	08/30/1983
From:	Leahy M, Scott D COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
83-852, LER-83-062-01T, LER-83-62-1T, NUDOCS 8309070246
Download: ML20024E927 (4)

Text

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43 44 47 CAuSE CESCRIPTION AND CORRECTIVE ACTICNS l i 10 l l Event cause appears to have been a failure of a HPCI controller amplifier. A jumo-1 li li I l er was installed on relay 2330-148 to maintain HPCI at the hiah speed stoo. The 1 1, t 2 i ~l ampilfier was reolaced and is beino monitored. Instabilities have been found in thd l i 131 l amplifier: therefore. monitorino will continue until cause of the instability has I li d a l I been determined. A sucolemental recort will be issued following the investicarica.!

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NAVE OF PREPARER Mark Leahv pwoNE: 815-942-2920 x422 {

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P A]T 1 l TITLE OF OEVI ATION OCCURRED 8/19/83 1630 HPCI Motor Gear cart rive SYSTEM AFFECTEo 2300 PLANT STATUS AT TIME OF EVENT TESTING HPCI yoog Run , p,Rcy,73 2526.8 , te,ogy.c3 802 G YES Nn DEsCntPTICN OF EVENT The HPCI motor gear unit was at the high speed stop at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />.

At 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br /> the HPCI motor gear unit was observed to oe at the low speed stop. The HPCI flow control was in auto at 942 The HPCI motor aear unit was run to the hiah speed stop, but drove to the low speed stop when the control switch was released.

10 CFR50.72 NRC RED PHONE NDTIFIC ATICN MAOE YES NO EQUIPMENT FAILURE 29828 YES NO WOGF REQUEST NO. GESPONsleLE SMFavi30R Jesse Williams n3rg 8/19/83 P ART 2 l 0PERATI NG ENGINEER' S COWE*.*S The problem appears to be a failure of an operational amplifier in the HPCI system flow control circuitry caused by HPCI room ambient temperatures in the range of 1200F. The balts of the HPCI room cooler fan were broken which caused the elevated temperatures -

the belts were replaced, and the HPCI room temperatures returned to an acceptable range of approximately 1100F. A jumper wire was installed to keep relay 2330-148 energized, which -

bypasses the automatic flow controller, but allows operation of the HPCI system (OVER)

O EVENT OF PUBLIC I N TER EST 24-HOUR NRC NOTI FICAri ON REQ'D TECH. SPEC. VIOLATION TELEPH Stan Stasek 8/22/83 0800 REGION (11 DATE TIME NON REPORTABLE OCCURRENCE TELEGM/TELECOPY J.G. Keooler 8/22/83 1930

@ I4 OAY REPO RTA BLE / T. S.6. 6. B .1. e REGION lli DATE TIME 30 DAY REPORTABLE /T. S.

CECO CORPORATE NOTIFICATION MADE ANNUAL /SPECL REPORT REQ'O IF ABOVE NOTIFICATION IS PER 10CFR2f A.I.R.

• 5 DAY WRI TTEN REPORT REQ'D PER 10CFR21 L.E.R. ,83-62/01T-0 Telecopy xxuxx Dennis P. Galle 8/22/83 228 CEC 3 CORPORATE OFFICER DATE TIME PRELIMINARY REPORT COMPLE1EO AND REVIEnEO Almr 8/22/83 CPERATING ENG.NEER .m / DATE ,

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ATTACHMENT TO LICENSEE EVENT REPORT 83-62/01T-0 COM40NWEALTH EDISON COMPANY (CWE) -

DRESDEN UNIT 2 (lLDRS-2)

DOCKET # 050-237 During normal operation, an operator observed the HPCI motor gear unit (MGU) moving between the high speed stop and low speed stop.

The safety significance was considered minimal because HPCI could still initiate automatically, and the flow was manually controllable. There was no danger to pubile health or. safety.

The apparent cause of the event is high temperatures in the HPCI room (about.1200F) caused by the breakage of the HPCI room cooler fan belts. This high temperature caused the failure of a HPCI system controller operational amplifier. A jumper has been installed on relay 2330-148 to maintain HPCl at the high speed stop. The amplifier was replaced and attached to a recorder for monitoring. Instabilities have been found in the operational amplifier; therefore, monitoring will continue until the root causes of the instab!Iity are fully determined and corrected. Operating Order #35-83 will cover proper unit operation whlie the 2330-148 relay remains Jumpered. A supplemental event report will be issued following the investigation.

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. . Commonwealth Edison Dresden NucD r Power Sttion

. R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 August 30, 1983 DJS Ltr #83-852 James G. Keppler, Regional Administrator Region 111 U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report #83-62/01T-0, Docket #050-237 is being submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.I.(e), failure or malfunction of one or more components which prevents or could prevent, by itself, the fulfillment of the functional requirements of system (s) used to cope with accidents analyzed in the SAR.

N b.\ h D.J. Scott M Station SupeYintendent -

Dresden Nuclear Power Station l

DJS/kjl Enclosure cc: Director of Inspection & Enforcement l Director of Management information & Program Control U.S.NRC, Document Management Branch File /NRC s

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