ML20117C578
| ML20117C578 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/23/1996 |
| From: | Terry C TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TXX-96447, NUDOCS 9608270438 | |
| Download: ML20117C578 (4) | |
Text
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M Log # TXX 96447
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File # 916 (3/4.8) 4 Ref. # 10CFR50.90 l
10CFR50.36 1UELECTRIC August 23, 1996 c.14nu Terry Gnmp Mce President U. S. Nuclear Regulatory Commission Attn: Document Control Room Washington, DC 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
D0CKET NOS. 50 445 AND 50-446 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION ON LICENSE AMENDMENT REQUEST 96 005 INVERTER / BATTERY CHARGER MODIFICATION
References:
(1) TU Electric letter TXX 96432 dated July 31, 1996, from C. L. Terry to the Nuclear Regulatory Commission " Submittal of License Amendment Request 96 005 pertaining to 1
Inverter / Battery Charger Modification" (2) Telephone conference calls from Chandu Patel and S. K. Mitra of Nuclear Regulatory Commission to Jacob Kulangara of TV Electric on August 20, 1996 Gentlemen:
By reference 1.
TV Electric submitted license amendment request 96-005 to amend the CPSES Unit 1 facility operating license (NPF 87) and CPSES Unit 2 facility operating license (NPF 89).
The purpose of this request is to (1) change the acceptance values for amperes and voltage for the 18 month surveillance test of the battery chargers; (2) clarify the meaning of the term " associated inverter" used in the context of energizing 118-Volt A. C. Instrument. Busses during MODES 1 through 6: and (3) delete the protection channel r.nd the vital bus ratings for the 118 Volt A. C.
Instrument Busses identified for MODES 1 through 4. These changes are associated with a plant modification in which the inverters and battery chargers are being replaced and an installed spare inverter is being added for each safety train.
Per reference 2. NRC requested additional information on reference 1 submittal as identified below along with the TU Electric responses:
Question 1: NRC inquired if the existing batteries have the required capacity to support the 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> coping duration with the battery charger out of service in a Station Blackout scenario at Comanche I
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Response 1: TU Electric confirms that the associated calculation 9608270438 960823 PDR ADOCK 05000445 i
P PDR Energy Plaza 1601 Bryan Street Dallas, Texas 75201-341l Y
TXX-96447 Page 2 of 2 considered the inverter upgrade (including an increase in rating from 7.5 KVA to 10 KVA) and determined that the capacity of the associated batteries are adequate to meet the 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> coping duration with the battery charger inoperable in the event of a Station Blackout.
Question 2: NRC requested that TU Electric provide a draft or preliminary sketch showing the proposed configuration showing the spare inverter alignment with respect to the dedicated inverters.
Response 2: A typical draft sketch of the proposed inverter configuration is enclosed with this transmittal.
TU Electric requests NRC approval of the proposed license amendment by October 1.1996, or earlier so as to allow the impir antation of the i
revised technical specifications during and/or following the next J
Unit I refueling outage.
Should you have any questions, please contact Mr. Jacob M. Kulangara at
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(214) 812 8818.
1 Sincerely.
lorAp-C. L. Terry
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By:
acas RogerQ). Walker
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Regulatory Affairs Manager JMK/jmk Enclosure c-Mr. L. J. Callan Region IV Hs. L. J. Smith, Region IV Resident Inspectors. CPSES Mr. T. J. Polich. NRR Mr. Arthur C. Tate Bureau of Radiation Control Texas Department of Public Health 1100 West 49th Street Austin. Texas 78704 j
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e ENCLOSURE TO TXX 96447 TYPICAL DRAFT SKETCH FOR THE PROPOSED INVERTER CONFIGURATION
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