ML20070F339
| ML20070F339 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 02/28/1991 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| ULNRC-2373, NUDOCS 9103080241 | |
| Download: ML20070F339 (2) | |
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rebruary 28, 1991 Grjy Donid F. $chnelt b,f,j{(yf'f(l(;
U.
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Nucicar Regulatory Commission
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"5 ATINt Document Control Doch M
Mail Station F1-137 Washington, D.C.
20555 Gentlomen:
ULif RC-2373 DOCKET NUMBER 50-483 CALLAWAY PLANT 10CPR50._46 ANNUAL REPORT-ECCS EVALUATION MODEL REVISIONS Refcrences:
1.
ULNRC-2356 datod 1-21-91 2.
ULNRC-2141 dated 1-19-90 3.
ULURC-2227 dated 6-12-90 4.
ULNRC-2236 dated 6-27-90 This letter provides the follow-up report to Reference 1.
There are no ECCS Evaluation Model changes implemented for Callaway Plant that are reportable per 10CFR50.46 for the period from August 1989 to August 1990.
Reference 2 provided the report for 1989 model 2 visions (covering the period from August 1988 to Augurt 1989) as they. applied to Callaway.
That letter discussed cight modifications to NOTRUMP, the computer code used to analyze small break LOCA for Callaway.
Two of those modifications were reported in Reference 2 as being applicable to Callaway and were assessed as having a +42"P impact en peak clad temperature (PCT).
The remaining six modifications have not been implemented for callaway and are not reportabic per 10CFR50.46.
These six modifications have boon evaluated by Westinghouse as either having no effect on PCT or as providing PCT benefits (i.e., PCT reductions).
Reference 2 also discussed an internal Westinghouse safety evaluation for the effects of. auxiliary feedwater purgo delay on small break LOCA PCT.
Por the commitments of Referenco 2, this was reported via References 3 (annual report of safety evaluations submitted por 10CFR50.59) and 4 (annual FSAR update per 10CFR50.71(e)).
Should you have any questions regarding this letter-please contact us.
I Very truly yours, f W'g/pgseg /d ~b C
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- 9103000241 91022G l
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/ Donald F.
Schnell W
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cc:
T. A. Baxter, Esq.
Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N. W.
Washigton, D.C.
20037 Dr.
J. O.
Cormak CFA, Inc.
4 Professional Drive (Suite 110)
Gaithersburg, MD 20879 R. C. Knop Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory Commission Region III 799 Roosovolt Road Glen Ellyn, Illinois 60137 Bruce Bartictt Callaway Resident Office U.S. Nuclear Regulatory Commission RRW1 Steedman, Missouri 65077 M. D. Lynch office of Nuclear Reactor Regulation U.S. Nuclear Regulation Comm!SFlon 1 White Flint, North, Mail Stop 13"21 11555 Rockville Pike
. Rockville, MD 20852 Manager, Electric Department Missouri Public Service Commission PO Box 360-Jefferson City, MO 65102 f
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