ML20236C490

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Advises That in Effort to Improve Reliability of DHR, Installation of motor-driven Feedwater Pump Being Evaluated. Mod of Auxiliary Feedwater Pump Cage to Provide Improved Access for Operations & Maint Also Under Evaluation
ML20236C490
Person / Time
Site: Rancho Seco
Issue date: 03/13/1989
From: Croley B
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To: Knighton G
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
AGM-NTS-89-056, AGM-NTS-89-56, NUDOCS 8903220181
Download: ML20236C490 (1)


Text

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p OSMU- SACRAMENTO MUNICIPAL UTkITY DISTRICT O P. O. Box 15830, Sacramento CA 95852-1830,(916) 452 3211-1 1

AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA ~

AGM/NTS89-056 March 13, 1989 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555' .

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Docket No. 50-312 '

Rancho Seco Nuclear. Generating Station License No. DPR-54 ,4 j

SECONDARY SIDE DECAY HEAT ' REMOVAL CAPABILITY l

l Attention: George Knighton ',

In an effort to improve the reliability of the secondary side-

, heat removal systems at Rancho Seco, the District is evaluating  !

l the installation of a motor driven feedwater pump. Although the design is in the preliminary stages, the pump / motor will.be non-safety related and will be powered from a non-Class 1 bus. .This pump will possess sufficient capacity to remove' postulated decay heat loads on a loss of both auxiliary feedwater pumps. In addition, the District is evaluating modification of .the auxiliary feedwater pump cage to provide improved access for operations and maintenance.

The addition of a new feedwater pump will significantly increase the availability / reliability of the OTSG feedwater systems at Rancho Seco. Installation of this pump and any modifications to the auxiliary feedwater pump cage will be completed no later than the refueling outage following operating Cycle 8.

Members of your staff with questions requiring additional information or clarification may contact Mr. Dave Swank.at (209) 333-2935, extension 4920.

Sincerely, 9

Bob G. Croley Assistant General M nager Nuclear Technical Services cc: A. D'Angelo, NRC, Rancho Seco l

J. B. Martin, NRC, Walnut Creek [

8903220181 890313 M i DR Q ADDCK 05000312 '

l PNU  ;

RANCHO SECO NUCLEAR GENERATING STATION D 14440 Twin Cities Road, Herald, CA 95638-9799;(209) 333-2935 L _ _ _ _ _ - _ _ - _ _ _ _ - _ - _ _ - _ -