ML20040B560
| ML20040B560 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 11/10/1981 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NJK-81-439, NUDOCS 8201260190 | |
| Download: ML20040B560 (2) | |
Text
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,l' Commonw:alth Edison PRINCIPAL STAFF C
Ouad Cities Nuclear Power Station 3IR E&IS Q'
22710 206 Avenue North Corcova, ::linois 61242 D/D i?AO T elephone 309/654-2241 C)
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Mr. James G. Keppler, Di rer. tor w
Directorate of inspection and Enforcement-Region lII U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Quad-Cities Station Units One and Two Temporary 4-KV Bus
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Modification, NRC Docket Numbers 50-254 and 50-265
Dear Mr. Keppler:
The purpose of this letter is to provide you with information pertaining to the recently installed temporary modification to cross-connect Unit Two 4-KV Bus 24-1 wi th Unit One 4-KV Bus 13-1, with Standby Diesel Generator 1/2 inoperable.
Unit Two is currently in a refueling outage, and Unit One is operating at power.
Details concerning the events which rendered the 1/2 Diesel Generator inoperable will be provided to your of fice by means of an LER.
Resident Inspectors N. Chrissotimos and S. Dupont have been kept informed, and are fully cocnizant of the information that follows:
Modification
Description:
The modification allows the Unit Two Diesel Generator to feed Unit One Bus 13-1 via Unit Two Bus 24-1, in lieu of having the 1/2 Diesel Generator to feed Bus 13-1.
A spare circuit breaker on Bus 24-1 was tied into a spare circuit breaker on Bus 13-1 using 3 safety grade cables, with 3 conductors each.
The trips were pulled f rom these breakers.
The Unit Two Diesel Generator is fully operable.
The large loads on Unit Two Bus 24-1 (Core Spray and RHR pumps) are not required to be operable, since Unit Two is in a refuel outage.
The breakers for these pumps are out-of-service.
The normal auto-starting circuitry for the 1/2 Diesel Generator from Unit One has been wi red into tiie Unit Two Diesel Generator, and the normal oto-starting circuitry for the Unit Two Diesel Generator from Unit Two has been removed.
Therefore, the Unit One protective circuitry for the Reactor and Bus 13-1 will auto-start the Unit Two Diesel Generator.
The Unit One Diesel Generator and redundant 4-KV Dus 14-1 remain unaffected by this modification. The modi fication was thoroughly checked for proper wi ring.
All auto-starts of the Diesel Generator were tested, as were all circuit breaker interlocks that were involved.
8201260190 811110 PDRADOCK05000g P
NOV 6 1981 1E28)%
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Mr. J. Kepp l e r Page 2 November 10, 1981 Administrative Controls:
A Temporary Procedure was written and implemented to describe the above configuration, end for opera'or training purposes.
The new cables were run and installed with protective covering.
The area around the cables is being kept clean and clear of combustibles.
Equipment Operator rounds include checking the area for any abnormai conditions.
Commi tmen t s :
The following commitments have been made to the NRC pursuant to this mode of operation:
1.
I f one of the two remaining Diesel Generators becomes inoperable, Unit One will be placed in a cold shutdown condition within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, unless the Diesel Generator is sooner made operable.
2.
If this condition exists at the time of commencement of Unit Two fuel re-load, discussion will be held wi th the NRC prior to starting the re-load.
Very truly yours, COMMONWEALTH EDISON COMPANY OUAD-CITIESNUCLEARPOWERSJpTION
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a:VAfg N. J. Kalivianakis Station Superintendent -
NJK:LFG/bb cc L. Del George N. Chrissotimos L. Gerner