ML20057A397
| ML20057A397 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 09/07/1993 |
| From: | Delgeorge L COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| IEB-93-003, IEB-93-3, NUDOCS 9309140146 | |
| Download: ML20057A397 (2) | |
Text
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Commonwealth Edison C
1400 Opus Place
'O Downers Grove. illinois 60515 a
September 7,1993 Dr. Thomas E. Murley, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attn: Document Control Desk
Subject:
LaSalle County Nuclear Power Station Unit 2 Supplemental Response to hTC Bulletin (IEB) 93-03,
" Resolution ofIssues Related to Reactor Vessel Water Level Instrumentation in BWRs," for LaSalle County Station Unit 2 i
NRC Docket No. 50-374
Reference:
(a)
L. DelGeorge letter to T. Murley, dated July 30,1993.
Dear Dr. Murley:
In the Reference (a) letter, Commonwealth Edison Company (CECO) j provided its initial response to subject NRC Bulletin (IEB) 93-03, i
" Resolution of Issues Related to Reactor Vessel Water Level Instrumentation in BWRs." The original response for LaSalle Unit 2 stated the following:
"During the 5th refuel outage (L2R05 beginning Sept 1993), the backfill modification will be installed. When the unit starts up, only the Post Accident Monitoring legs will be valved in. At the first shutdown after 6 months experience has been accumulated with the system, the reference leg for the Division 2 trip systems will be valved in. At the second shutdown after the same six months experience, the remaining reference legs will be valved in."
In the time frame since submitting the Reference (a) letter, CECO has been i
evaluating progress made towards completion of the hardware modifications for LaSalle County Unit 2. After further analysis of the CECO IEB 93-03 modification program and the continuing evaluation ofindustry experience to date, CECO is supplementing our original response for LaSalle County Unit 2. This supplemental response is stated as follows:
For LaSalle Unit 2: During the 5th refuel outage (L2R05 beginning Sept 1993), the backfill modification will be installed. When the unit starts up, all reference legs associated with the backfill modification will be valved in and declared operable. If problems are encountered with reactor vessel level that are discovered to be directly attributable to the backfill y 9, y ',,-
modification, LaSalle will disable the backfill system and immediately notify
-v your Staff to discuss dispositioning the concerns.
9309140146 930907 E
I ADOCK 05000374 [%
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e Dr. Thomas E. Murley September 7,1993 This response supersedes the previous commitments (as stated in Reference (a)) made for LaSalle County Unit 2 in their entirety.
11 you have any questions or comments, please direct them to this office.
Respectfully, t
/
4 j.
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L.O. DelGeorge Vice President l
I cc:
J. B. Martin, Regional Administrator - RIII J. L. Kennedy, Project Manager - NRR 3
D. Hills, Senior Resident Inspector - LaSalle l
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