ML17321A778
| ML17321A778 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/13/1985 |
| From: | Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| AEP:NRC:0941A, AEP:NRC:941A, NUDOCS 8508150042 | |
| Download: ML17321A778 (8) | |
Text
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR 8508150042 DOC~DATE 85/08/13 NOTARIZED NO DOCKET FACIL:50-315 Donald C,
Cook Nuclear Power Pl ant r Uni t 1< Indiana 8
05000315 AUTH BYNAME AUTHOR AFFILIATION ALEXICH~M,P, Indiana L Michigan Electric Co, RECIP. NAt'1E RECIPIENT AFFILIATION DENTONpH ~ RE Office. of Nuclear Reactor Regulationr Director
SUBJECT:
Forwards addi info on analysis supporting FQ limits for l'lestinghouse fuelgper NRC 850725 request. Results previously submitted remain applicable based on encl analysis, Review needed prior to entry into Mode 1 for Cycle 9 startup
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OL: 10/25/7 q 05000315 RECIPIENT ID CODE/NAME NRR ORB 1 BC 01 INTERNAL: ACRS 09 ELD/HDS3 NRR/DL DIR NRR/DL/TSRG NRR/D8 I/RAB RGN3 COPIES LTTR ENCL 7
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INDIANA8 MICHIGAN ELECTRIC COMPANY P.O. BOX 16631 COLUMBUS, OHIO 43216
- August33, 1985 AEP: NRC: 0941 A ~
Donald C. Cook Nuclear Plant Unit No.
1 Docket No."50-315 License No. DPR-58 ADDITIONAL INFORMATION ON ANALYSIS SUPPORTING F LIMITS FOR WESTINGHOUSE FUEL Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D. C.
20555"
Dear Mr. Denton:
This letter is in response to an July 25, 1985 telephone call with members of your staff'oncerning our letter AEP:NRC:0941; dated July 23, 1985.
Specific information was requested concerning additional large break analyses with maximum safeguards and a discussion of the effect of various power shapes on K(Z).
The attachment to this letter, AEP:NRC:0941A, transmits that information.
Review of the subject analysis is needed prior to initial entry into Mode 1
for the Donald C. Cook Unit 1 Cycle 9 startup.
I
- In oompliance with the requirements of 10 CFR '50.91(b)(1),
a copy of this letter and its attachments have been transmitted to Mr. R. C. Callen of the Michigan Public Service Commission.
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This dooument has been prepared following Corporate procedures which-incorporate a reasonable set of controls to insure its accuracy and completeness prior to signature by the undersigned.
Very truly yours, M.
. Ale ch Vice Pres dent p-'1 e5081SO042 0gooOSis 850813 pgR
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Mr. Harold R. Denton AEP:NRC:0941A
Attachment:
"Additional Information Supporting the D. C.
Cook Unit 1 3250 MWt Large Break LOCA Analysis", Westinghouse Electric Corporation,
- August, 1985.
oc: John E. Dolan W. G. Smith, Jr.
<< Bridgman R. C. Callen G. Bruchmann G. Charnoff NRC -Resident Inspector - Bridgman
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ATTACEfENT TO AEP:NRC:0941A Additional information Su ortin the D.
C.
Cook Unit 1 3250 >Mt Lar e B eak LOCA Anal sis, Westinghouse Electric Corporation,
- August, 1985 August 12, 1985 Zn response to an NRC question on the impact of the BART Vin methodology change on ECCS analyses where there are no postulated failur'es in ECCS equipment (Max SI), Westinghouse has performed a
3 break, spectrum analysis with the following results>
EEFUS 0 e'.4 1985 F
2107 F
Oe6 1937oF 2154oF Oe8 1873oF 2046oF
- Based, on these
- cases, the results previously submitted for D.
C, Cook (0.6 Max SX), Unit 1 remain applicable.
l The impiact of tho BART Vin methodology on the Westinghouse E(c) maths)alogy was also goestioned hy the NRc.
z'ower shape sensitivity studies performed with Westinghouse ECCS evaluation models have always demonstrated the chopped cosine shape with the peak at the core
'midplane to be limiting.
Westi nghouse has performed <<spot
- checkN, analyses using the BART reflood evaluation model for power shapes skewed to the top of the core.
Results of these analyses have demonstrated the chopped cosine peaked at the core midplane remains the limiting power shape.
This result is to be expected since the mechanistic computations of core reflood heat transfer performed in BART provide their maximum benefit at core elevations above the midplajne.
The BART Vin methodology change should not impact the results of these studies since the power shape study is a sensitivity for a
given set of initial and transient conditions.
The impact of, the BART Vin methodology change is a lower flooding rate for the first, few seconds of the reflood portion of the LOCA transient.
Since
,'the change to these first few seconds is independent of the power I shape, the sensitivity to. the power shape, which manifests itself much later in the reflood transient, would be the same between the tQo cases.
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