ML20137W555
| ML20137W555 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 02/07/1986 |
| From: | Ainger K COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 1280K, NUDOCS 8602200214 | |
| Download: ML20137W555 (1) | |
Text
N Commonwealth Edison
) One First National Plaza. Chicago, Ithnois 0-C' Address Reply to: Post Othee Box 767 Chicago, Illinois 60690 February 7, 1986 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory' Commission Washington, DC 20555
Subject:
Byron Station Units 1 and 2 Limiting Conditions for Operation Relaxation Program NRC Docket Mos. 50-454 and 50-455 Reference (a): May 2, 1984 letter from L. O. De1 George to H. R. Danton
Dear Mr. Denton:
Reference (a) transmitted a report titled " Byron Generating Station Limiting Conditions for Operation Relaxation Program". This report documents a study which evaluated the effect on plant risk from increasing allowable out-of-service times for certain equipment. One of the systems studied in this report is the Essential Service Water (ESW) system.
During the review of this report, it was determined that the success criteria related to loss of an ESW system train was modeled more conservatively than necessary. Specifically, it was modeled such that success was dependent'on the operation of ESW cooling tower fans.
For a non-LOCA condition, no cooling tower fans are required to accomplish a safe shutdown of the plant. This is supported by analysis discussed in the response to FSAR question 10.39.
In consideration of this, there is no cooling tower fan contribution to the loss of ESW initiating event.
Please direct any questions regarding this matter to this office.
One signed original and fifteen copies of this letter are provided.
Very truly yours, h!
54 P
K. A. Ainger Nuclear Licensing Administrator la cc: Byron Resident Inspector 8
1280K l
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