ML20116N097

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Forwards Rev C to Calculation FC-05916, Operating Temp Limits for DG-1 & DG-2, Per 920903 Telcon Re DG Ambient Air Temp Operating Limits
ML20116N097
Person / Time
Site: Fort Calhoun Omaha Public Power District icon.png
Issue date: 11/16/1992
From: Gates W
OMAHA PUBLIC POWER DISTRICT
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20116N100 List:
References
LIC-92-299, NUDOCS 9211230189
Download: ML20116N097 (4)


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Omaha Public Power District 444 South 16th Street Mall Omaha Nebraska 68102-2247 402/636-2000 November 16, 1992 LIC-92-294 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station Pl-137 Washington, DC 20555

References:

1. Docket No. 50-285
2. Letter from 0FPD dated . lune 30,19(92 (LIC-92-207R)W. G. Cates) to NRC (Document Con
3. Letter from OPPD (W. G. Gates) to NRC (Document Control Desk) dated August 14. 1992 (LIC-92-289R)

Gentlemen:

SUDJECT: OPPD Proposed Actions Regarding Diesel Generator Ambient Air Temperature Operating Liuits In a telephone conference call on Sep'tember 3,1992, Omaha Public Power District (OPPD) and the NRC discussed OPPD s plans for hot weather testing of the Emergency Diesel Generators (DG) at fort Calhoun Station (FCS) with an ethylene glycol / water mixture coelant. This discussion was based on information submitted to the NRC by 0 PPD in References 2 and 3, in this call, the NRC requested that OPPD submit responses to the following questions:

1. What type of testing does OPPD intend to perform on DG-l?
2. What contingency actions are planned should the ambient air temperature approach the operating limits for DG-1 established in Reference 2?
3. What does OPPD intend to supply the NRC upon completion of testing?

Subsequent to this call, significant new information was recently received and verified by OPPD to be relevant to these questions and the information supplied by References 2 and 3. Therefore, this letter transmits the information rt b :sted by NRC and updates the information in Raferentes 2 and 3.

OPPD's goal is to maintain an ambient air temperature upper limit of Il0*F for l both DG-1 and DG-2. OPPD implemented several actions during the 1992 refueling outage to enhance DG performance, including fan replacement on both DGs and reduction of equipment loads on DG-2. Based on these actions, an engineering calculation (FC 05916) and 10 CFR 50.59 Safety Evaluation were completed. They comonstrated the acceptability of using a 50% ethylene glycol / water mixture as coolant in all seasons, with resulting ambient air upper temperature limits of 104* F for DG-1 and 110* F for DG-2. The calculation and safety evaluation were provided by the Reference 3 submittal.

9211230189 921116 }

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t data, and a justification of acceptability of the achieved temperature limits and/cr any recommended DG enhancements.

The EA described above will be provided to the NRC within 90 days following completica of the hot weather testing, but no later than November 1, 1993.

OPPD con' .es the plan detailed in this letter to be a conservative approach that maximizes diesel generator availability while preserving an acceptable level of safety. If you should have any questions, please contact me.

Sincerely,

$ h.

W. G. Gates Vice President -

Nuclear WGG/tcm Enclosure c: LeBoeuf, Lamb, Leibv & MacRae J. L. Milhoan, NRC Ilegional Adn.inistrator, Region IV R. P. Mullikin, NRC Senior Resident inspector S. D. Bloom, NRC Project Mariager i

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