ML20073D028
| ML20073D028 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 04/23/1991 |
| From: | Schuster T COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| TAC-79080, TAC-79081, NUDOCS 9104260125 | |
| Download: ML20073D028 (2) | |
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Downers Grove. Illinois 60515 April 23,1991 Dr. Thomas E. Murley Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555 Attn:
Document Control Desk
Subject:
Byron Station Units 1 and 2 Withdrawal of Application for Amendment To Facility Operating Licenses NPF 37/66 TAC # 79080/7908 t NRC DncheWosl0d54L455
References:
a) Auge 16,1990 letter from T.K Schuster to Dr T.E. Murley, b) April 23,1991 letter from T,K. Schuster to Dr. T.E. Murley documet-ing a Teleconference held on April 12,1991.
Dear Dr. Murley:
In Reference (a), pursuant to 10 CFR 50.90, Commonwealth Edison Company (CECO) proposed to amend Appendix A, Technical Specifications of Facility Operating Licenses NPF 37 and NPF-66. The proposed amendment requested changes to Specifications 3.7.4 and 3.'7.5 regarding the Essential Service Water cooling system, Review of the supporting documentation for the submittal, including the original analysis performed to determine the heat removal capability of tne system, has identified two assumptions which are non conservative. An Interim operability assessment, which assessed the im aact of the non conservative assumptions on the safety function of the Essential Serv ce Water Cooling Towers, has been performed.
The assessment confirmed the im aact on the original anaysis is minor and Is easily offset by margin provided by antic pated near term weather conditions. Further discussion of this operability assessment and future plans relative to the operability of this system are contained in the letter of Reference (b). Based on CECO's commitment to operate its nuclear facilities safely and conservatively, a detailed reconstitution of the
. des gn bases of the Essential Service Water System is underway, including a comprehensive operability assessment. Until completion of this r9 view, CECO deems It appropriate to withdraw the proposed amendment cf Reference (a). Resubmittal of an amendment similar in scope will occur at a later datu. Conservative and safe operation of the system until resubmittalis assured both by areviously instituted administrative controls and the current operability action plan pulin place by CECO.
Commonwealth Edison is notifying the State of Illinois of withdrawal of our.
apalication for amendment by transmitting a copy of this letter to the designated State Oricial.
9104260125<910423~
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Dr. Thomts E, Murity 2-April 23,1991 To the best of my knowledge and belief the statements contained herein are true and correct, in some respects, these statements are not based on my personal i
knowledge but upon Information received from other Commonwealth Edison and contractor employees. Such information has been reviewed in accordance with Company practice and I believe it to be reliable, j
Please direct any questions you may have concerning this matter to this office.
Respectfully, j
.i f f j h E L' A T.K. Schuster l
Nuclear L.lcensing Administrator i
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W. Kropp - Byron '
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