ML20126J689
| ML20126J689 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities  |
| Issue date: | 04/15/1981 |
| From: | Rausch T COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20126J692 | List: |
| References | |
| IEB-79-26, NUDOCS 8105040519 | |
| Download: ML20126J689 (2) | |
Text
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One First National Plaza. Chicago. Ilhnois Comm2nwIlth Edison Address Reply to: Post Office Box 767 THIS DOCUMENT CONTAINS Chicago, liknois 60690 P00R QUAUTY PAGES
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April 15, 1981
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Mr. James G. Keppler, Director o
Directorate of Inspection and Enforcement - Region III yh
/
U.S. Nuclear Re9ulatory Commission N
799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Dresden Station Units 1, 2, and 3 Quad Cities Station Units 1 and 2 Response to IE Bulletin 79-26 Item 4,
" Boron Loss from BWR Control Blades" NRC Docket Nos. 50-10/237/249 and 50-254/265 Reference (a):
J. 6. Keppler letter to C. Reed dateo August 29, 1980 (IE Bulletin 79-26, Rev. 1)
(b):
" Control Blade Examination Results ana Response to item 4 of IE Bulletin 79-26,"
NEDE-24325-P, (General Electric Proprietary) and NED0-24325, March 1981 (Enclosure).
(c):
" Evaluation of Control Blade Lifetime With Potential Loss of B C,"
(General Electric Proprietary) and NED0-?4226, December 1979; NEDE-24226-P (General Electric Proprietary) Supplement 1, March 1981.
(d):
R. L. Gridley letter to Dr.
W.
A.
Johnston dated April 8, 1981 (MFN-066-81)
Dear Mr. Keppler:
This letter is to provide the Commonwealth Edison Company response to Item 4 of IE Bulletin 79-26 Rev.
1, which was transmitted by Reference (a), for Dresden Units 2 and 3 and Quad Cities Units 1 and 2.
The response for Dresden Unit 1, addressin9 bulletin items 3 and 4, will be provided prior to startup of the unit, now scheduled for June, 1986.
Enclosed is one copy each of the Reference (b) reports which satisfies the bulletin item 4 requirements for Dresden Units 2 and 3 and Quad Cities Units 1 and 2.
These reports provide the results of additional post-irradiation examinations, and comparisons of the post-irradiation examination results tc a new boron depletion analytical model developed by General Electric.
The boron depletion 8105040519 Q
APR 1,6.1981
1 e mocel described in Reference (b) is shown to be in good agreement with the post-irradiation examination data.
General Electric demonstrates in Reference (b) that the control blade destructive examination data presented in References (b) and (c) are applicable to and representative of, the control blades in Dresden Units 2 and 3 and Quad Cities Units 1 and 2.
The reports confirm that the loss of boron based on 50% local' boron depletion is predictable, and is not affected by the. plant operating parameters.
Reference (b) contains information which General Electric Company customarily maintains in confidence and withholds from public disclosure.
The information has been handled and classified.
as proprietary to General Electric, and we hereby request that NEDE-24325-P be withheld from public disclosure in accordance with provisions of 10 CFR 2.790.
Reference (d) contains a General Electric affidavit on the proprietary nature of NEDE-24325-P.
Please address any questions you may have concerning this matter to this office.
Very truly yours, f
,Vg ~ <
c Thomas J. Rausch Nuclear Licensing Administrator l
Special Projects Enclosure (Ref. (b))
cc:
Director, Division of Reactor Operations Inspection (w/ encl.)
Dr. William A. Johnston, NRC (w/o enc l.)
Rll! Inspector - Dresden (w/o encl.)
Rill Inspector - Quad Cities (w/o encl.)
2319B
.