ML20214E022
| ML20214E022 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 05/11/1987 |
| From: | Leblond P COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML20214E025 | List: |
| References | |
| NUDOCS 8705210599 | |
| Download: ML20214E022 (2) | |
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- One Fret Nabonel Plaza, CNcago. Illinois i - v v.. A M
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l Address Reply 10: Post Ofilm Box 767 CNeago,lanoiseoseo 0767 t
May 11, 1987 j j U.S. Nuclear Regulatory Comunission
. Attn: Document Control Desk
.ilashington, DC 20555
Subject:
' Byron Station Units 1 and 2 Braidwood Station Units 1 and 2 i
ATWS Protection - 10 CFR 50.62 l
-NRC Docket Nos. 50-454/455 and 50-456/457 References (a): December 12, 1986 letter-from P.C. LeBlond to H.R. Denton (b): January 30, 1987 letter from P.C. LeBlond H.R. Denton Centlemen:
A teleconference was held on February 9,1987 with Comunonwealth
. Edison personnel and L.N. Olshan along with other members of the NRC staff.
.The purpose of that teleconference was to discuss commonwealth Edison Company's proposed design for the ATWS Mitigation System for the Byron /Braidwood Stations. This design had been previously submitted in j
references (a) and (b).
This submittal is transmitting a copy of Revision 2 to "ATWS i
~ Mitigation System Specific Design for Byron /Braidwood Stations". Revision 2 includes resolution of issues that were discussed on February 9, 1987 and issues that have-recently been addressed through the Westinghouse owners Group.
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. Specifically, the design changes include;
.a).AMS arming to be automatic rather than manual b). C-20 permissive de-energizing time delay to be 120 seconds rather than 60 seconds c) reduction in the C-20 setpoint from 70% nominal load to 40%
d) reduction in the feedwater flow setpoint frca 50% of nominal feed flow to 25%
If any further questions arise regarding this irisue, please direct them to this office.
Very truly yours, hk b P.C. LeBlond Nuclear Licensing Administrator cs cc: Byron Resident Inspector Braidwood Resident Inspector Regiona1' Administrator - RIII J.A. Stevens - NRR L.N. Olshan - NRR s.
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