ML20245F034
| ML20245F034 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 04/28/1989 |
| From: | Morgan W COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8905020241 | |
| Download: ML20245F034 (2) | |
Text
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\\ Comm:nwrith Edison-
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_ /.72 West Adams Street, Chicago Illinois '
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) Address Reply to: Post Othee Box 767
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1'?%/ ! Chicago, Illinois 60690 0767 4
- e April 28,.1989 l
L E
U.S.' Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 i
Subject:
LaSalle County Station Units 1 and 2 Implementation of 10 CFR 50.62, ATWS Rule -
Response to Request for Additional Information NRC Docket Nos. 50-37; and 50-374 References (a):
P.C. Shemanski letter to H.E. Bliss dated January 5, 1989.
(b):
W.E. Morgan letter.to U.S. NRC dated February 24, 1989.
Dear Sir Reference (a) provided the Safety Evaluation regarding LaSalle County
. Station Units 1 and 2 compliance with ATWS itule 10 CFR 50.62.
Additionally, this. letter' requested that Commonwealth Edison submit its proposed resolution
- of.certain remaining open items.
Reference (b) provided this information and stated that.the two issues concerning 1-ATWS/RPT System Testability at Power and ATWS/RPT one-out-of-two (1:2) Logic Design, required further review and that the results of this review would be transmitted by April 28, 1989.
Based on the requirements outlined in Reference (a) and the results
' of Commonwealth Edison's review, LaSalle Station has commited to the following:
- The RPT control circuitry will be modified to provide the capability to perform periodic surveillance tests during
~
normal plant operation up to and including the actuating relay.
The RPT logic design will be modified to "one-out-of-two" taken twice replacing the existing "one-out-of-two" trip scheme.
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,, US.NRC April 28, 1989 LaSalle Station wJil procure all new devices safety-related and engineer these design changes as. safety-related modifications. The detailed design and procurement of equipment will require an estimated 40 weeks.
Due to the enmplexity of the modification, these modifications will be scheduled to be c 1 leted by the end of the fourth refueling outage of each unit (Unit 1, June 1991} (Unit 2, March, 1992).
l If you have any questions regarding this subject, please refer them to this office.
Very truly yours, W
,A y
W.
E. Morgan Nuclear Licensing Administrator Im cc P.C. Shemanski - NRR LaSalle Resident Inspector 0100T
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