ML20248G985
| ML20248G985 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 10/02/1989 |
| From: | Bradham O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8910110126 | |
| Download: ML20248G985 (2) | |
Text
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Jenkinsville. SC 29065 Nuclear Operations (803) 345 4040
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SCE&G-l October 2, 1989
. Document Control Desk
-U. S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Station Blackout Gentlemen:
On April 17, 1989, Virgil C. Summer Nuclear (VCSNS) submitted a response to the NRC amendment to the regulations in 10CFR, Part 50. Specifically. the submittal was in response to a new section, 50.63, which was added to require that each light-water-cooled nuclear power plant be able to withstand and recover from a station blackout (SBO) of a specified duration.
While formulating the response to this rule it was determined that the Class 1E batteries installed at VCSNS have sufficient capacity to meet SB0 loads for the required 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> assuming that loads not needed to cope with a SB0 are stripped. However, because load stripping is not considered the most prudent method to meet the SB0 duration requirement, SCE&G chose to install a dedicated power source to supply power to the battery chargers. ' This plan to extend battery capacity was presented in the formal submittal.
Since this submittal, SCE&G has determined that the most etfective method of meeting the SB0 duration requirement is to replace the existing Class 1E batteries. This cor,clusion was based on the age and condition of the batteries currently installed, and on the possibility of future replacement.
The replacement battery will have sufficient capacity to rr.eet the required SB0 duration without havina to strip any loads.
The schedule f or installation of the higher capacity battery will conform te the guidelines submitted in the original response. Specifically, this modification will be completed within two years after the notification provided by the Director, Office of Nucleat Regulation in accordance with 10CFR50.63(c)(3), or no later than the end of the sixth refueling outage, whichever is later. The sixth refueling outage is currently scheduled for the fall of 1991.
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'Docurnent Control Desk Letter
.0ctober-2, 1989 Page 2 of 2 Should you have any questions, please call at your convenience.
Very truly yours, hfad
- 0. S. Bradham EWR/0SB: led c:
D. A. Nauman/0. W. Dixon, Jr./T. C. Nichols, Jr.
E. C. Roberts W. A. Williams, Jr.
S. D. Ebneter J. J. Hayes, Jr.
General Managers C. A. Price R. B. Clary K. E. Nodland J. C. Snelson R. L. Prevatte J. B. Knotts, Jr.
H. G. Shealy E. W. Rumfelt D. O. Hicks NSRC NPCF RTS (REG 880002)
File (811.05) l
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