TXX-6002, Final Deficiency Rept CP-86-15 Re Diesel Generator Controls. Initially Reported on 860314.Controls Reviewed by Tdi Under Owners Group Design Review & Quality Revalidation Program. Condition Not Reportable Per 10CFR50.55(e)
| ML20215C556 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/01/1986 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| CP-86-15, TXX-6002, NUDOCS 8610100336 | |
| Download: ML20215C556 (2) | |
Text
f Log # TXX-6002 N
File # 10110 909.5 4
TEXAS UTILITIES GENERATING COMPANY
,.0ctober 1, 1986 gm Mr. Eric H. Johnson, Director Division of Reactor Safety and Projects U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76012 t
i
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 DIESEL GENERATOR CONTROLS SDAR:- CP-86-15 (FINAL REPORT) i
Dear Mr. Johnson:
On March 14, 1986, we verbally notified your Mr. T. F. Westerman of a 2
deficiency involving the field flash and K1 relays which are required to operate during the starting process of the diesel generators. Our last interim report was logged TXX-5013, dated September 17, 1986. We received an extension in submitting this report from your Mr. T. Westerman until October 1, 1986.
The diesel generator controls were reviewed by Transamerica Delaval Inc. (TDI) under the Owners Group Design Review and Quality Revalidation Program.
During this review, it was determined that the minimum acceptable operating voltage for the field flashing and K1 relays was not in accordance with project specification requirements. The minimum acceptable operating voltage for the above relays is 100VDC versus 90VDC as required by the specification.
Earlier calculations indicated that the voltage at the diesel generator control panel' would drop below 100 volts DC when the attery voltage is at its minimum value (105 volts DC) and the field flashing circuit draws 90 amp DC from the battery.
The vendor has now clarified that althcugh the field flashing circuit current requirenent is 90 'mp DC, the inhetance of the generator field and the reverse potential teveloped acro n the battery l
terminals due to excitation will limit the battery contribution to a maximum of approximately 14 amps DC. Based on this now, l w r battery current demand, the-existing design, and a minimum battery termmal voltage of 105VDC, the voltage at the diesel generator control panel bus will be greater than 100VDC.
Therefore, the above deficiency will have no adverse affect on the safety of operations of the Diesel Generators.
8610100336 861001 PDR ADOCK 05C00445 S
PDR f(p-A snv1SION OF TEKAS UTIEITIES ELECTRIC COMPANY l
TXX-6002 October 1, 1986 Page 2 We have concluded this issue is not reportable pursuant to the provisions of 10CFR50.55(e).
Records supporting this determination are available for your inspectors to review at the CPSES site.
4 Very truly yours, b'
0Y W. G. Co si By:
I G. S. Keeley " /s
-Manager, NucTe Licensing JCH/amb c - NRC Region IV (0 + 1 copy)
Director, Inspection & Enforcements-(15 copies)
U. S. Nuclear Regulatory Commission Washington, D.C.
20555
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