ML20084J134

Telecopy Ao:On 730506,after 1/2 Diesel Generator Shutdown, Air Starting Accumulators Found Depressurized W/Compressors Running Continuously Following Inadvertent Trip of Buses 13 & 13-1.Caused by Closed Diesel Start Relay Contact

ML20084J134
Person / Time
Site:	Quad Cities
Issue date:	05/07/1973
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Grier A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084J128	List: ML20084J126 ML20084J134
References
NUDOCS 8305120176
Download: ML20084J134 (1)

Text

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ICS IPMBNGZ CSP 3096542241 TDBN CORDOVA IL 139 05 07 345P EST PMS MR B GRIER po i q

US ATOMIC ENERGY COMMISSION REGENT THREE COMPLIANCE 799 ROOSEVELT RD GLENELLYN IL 60137

REFERENCE:

QUAD CITY NUCLEAR POWER STATION UNIT NUMBER 2 DOCKET 50-265 DPR-30 APPENDIX A SECTION 1.0.A 4 AT 0900 ON M AY 6 1973 THE 1/2 DIESEL GENERATOR ALITO STARTED k WHEN BUSES 13 AND 13-1 WERE INADVERTENTLY TRIPPED. UNIT ONE .

WAS IN COLD SHUTDOWN AND UNIT TWO WAS AT 90 PERCENT POWER. FOLLOWIN THE DIESEL SHUTDOWN THE AIR STARTING ACCUMULATORS WERE FOUND TO BE DEPRESSUF.IZED WITH THE COMPRESSORS RUNNING CONTINUOUSLY.

THE CAUSE WAS TRACED TO THE DIESEL ST ART RELAY CONT ACT WHICH V 1201 (R&49; CLOSED TO OPERATE THE SOLEN 0ID VALVE SUPPLYING AIR TO THE ST ARTING MOTOR. AN ARC ACROSS THIS CONJACT liAD WELDED THEM CLOSED PREVENTING THEIR OPENING AFTER THE AUTO ST ARTED. SURVEILLANCE REQUIREMENT OF SECTION 4.9.E.1 WERE SUCCESSFULLY MET ON UNIT TWO DURING THE PERIOD THAT THE SHARED DIESEL WAS INOPERABLE. THE DAMAGED CONTACT WAS REPLACEDAND THE DIESEL MADE OPERABLE BY 1800.

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