ML20101S260
| ML20101S260 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 07/13/1992 |
| From: | Woodard J SOUTHERN NUCLEAR OPERATING CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-REGGD-01.155, RTR-REGGD-1.155 NUDOCS 9207170031 | |
| Download: ML20101S260 (3) | |
Text
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e n tt Ica erahng Company thrmngham, AWbama 35?ot Teicphone 205 806'486 m
J. D. Woodard VICS rf05 dent f/10 $Dufh('fn P OCfflC S)$ft"?7 I
Faty Pro,cct July 13, 1992 10CFR50.63 Docket Nos. 50-348 50-364 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Joseph M. Farley Nuclear Plant Supplemental Res)onse To The i
Station Blac (out Rule Gentlemen:
On June 15, 1992, Southern Nuclear Operating Company (SNC) received the Nuclear Regulatory Commission Supplemental Safety Evaluation (SSE) relative to the Station Blackout (SBO) Rule.
The SSE requested: (1) confirmation that the plant still meets its licensing basis for all design basis accidents with emergency diesel generator (EDG) 2C used as an alternate AC (AAC) power source, (2) confirmation that EDG 20 will not be loaded to more than 3100 kW during an SB0 event, and (3) implementation of an EDG reliability program that meets the guidance of RG 1.155, Section 1.2.
In response:
(1) SNC confirms that the four EDG's remaining after EDG 20 becomes the dedicated AAC power source will be capable of meeting all the design basis accident emergency power requirements.
(2) SNC confirms that EDG 2C is a fully capable AAC power source, and it has sufficient capacity to power a complete safety train (Train B).of LOOP loads for one unit.
Train B LOOP loads will be 3082 kW for Unit I and 3096 kW for Unit 2.
These load values are lower than those presented during the October 4, 1991 meeting (3434 kW for Unit I and 3382 kW for Unit 2).
This reduction in the load values is the result of load reduction changes scheduled to be implemented simultaneously with the SB0 changes for dedicating EDG 2C as the AAC source.
The SB0 loading on EDG 2C during SB0 events will be 3096 kW on Unit I and 3108 kW on Unit 2.
The 8 kW excess load when supplying SB0 loads on Unit 2 is insignificant and is of no concern given the amount of conservatism in the calculation of miscellaneous small loads, the short duration (4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />) of the SB0 event, and the operator capability to reduce diesel loading through load management actions. The small difference between the total LOOP loads and the SB0 loads is the result of different l
3 920Y1766j1 920713 DR p
ADOCK 05000348 PDR
U.'s Nuclear Regulatory Connission Page two miscellaneous loads required for running EDG IB 20.
(3 develope)d and issued which implements the guidan n ng EDG D.
This program incorporates the requirements of Regulato as been Section 1.2.
-00 Appendix ry Guide 1.155, The schedule contained in the previous response dated J still valid.
une 5, 1991, is If there are any questions, please advise.
Respectfully submitted,
(
S0VIHERN NUCLEAR OPERATING COMPANY k.--J.
- idd oodard JDW/JGS
- cht-92.1449 cc: Mr. S. D. Ebneter Mr. S. T. Hoffman Mr. G. F. Maxwell
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U.'S. Nuclear Regulatory Commission Page two j
miscellaneous loads required for running EDG IB or 2B versus running EDG 20.
(3) A procedure for the diesel generator reliability program has been developed and issued which implements.the guidance of NUMARC 87-00 Appendix D.
This program incorporates the requirements of Regulatory Guide 1.155, Section 1.2.
The schedule contained in the previous response dated June 5, 1991, is still valid.
If there are any questions, please advise.
)
Respectfully submitted, SOUTHERN NUCLEAR OPERATING COMPANY
( A h) lQ. I Woodard rd d JDW/JGS:cht-92,1449 cc: Mr. S. D. Ebneter Mr. S. T. Hoffman Mr. G. F. Maxwell
be:
Mr. R. P. Mcdonald Mr. W. G. Hairston, Ill Mr. R. D. Hill Mr. D. N. Morey a
Mr. K. W. McCracken Mr. J. K. Osterholtz Mr. J. W. McGowan Mr. O. Batum Mr. W. R. Bayne Commitment Tracking System (2)
Document Control (2) l l
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