ML20217B747
| ML20217B747 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 10/01/1999 |
| From: | Feigenbaum T NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| AR#99013980, NYN-99091, NUDOCS 9910130052 | |
| Download: ML20217B747 (3) | |
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The Northeast Utilitin Syntem October 1,1999 Docket No. 50-443 NYN-99091 AR#99013980
. United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Seabrook Station North Atlantic Reporting of Changes to, or Errors In
- Emergency Core Cooling System Models or Applications Pursuant to the requirements of 10CFR 50.46(a)(3)(i), (ii), North Atlantic Energy Service Corporation (North Atlantic) provides notification of a change in peak cladding temperature (PCT) of more than 50 F. A change in the Westinghouse BART/ BASH Evaluation Model assessment, (revised 9/21/99), resulted in an increase of 15 F for LOCABART spacer grid single-phase heat transfer error and an increase of 43. F for LOCABART zirc-water oxidation error. The increase for the Large Break LOCA PCT is 58 F resulting in a total PCT of 2050 F.
There are no changes to the Small Break LOCA PCT value.
Enclosed is a tabulation of the Large Break LOCA PCT margin utilization applicable to Seabrook Station.
Should you have any questions regarding this report, please contact Mr. James M. Peschel,
. Regulatory Compliance Manager at (603) 773-7194.
Very truly yours, NORTH ATLANTIC ENERGY SERVICE CORP.
WW Mr m
fed C. Feigenbaum 1gm10 Executive Vice Pre ent and Chief Nuclear Officer i
cc:
IL J. Miller, NRC Region I Administrator J. T. Harrison, NRC Project Manager, Project Directo) ate 1-2 g
R. K. Lorson, NRC Senior Resident Inspector j
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Large Break Peak Clad Temperature Margin Utilization ECCS EVALUATION MODEL REVISIONS / ERRORS 10 CFR 50.46 REPORT
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Evaluation Model : basil Fuel: 17x17 V511 FQ=2.5 l
F A 11=1.65 SGTP=13%
3411MWt Lice Break Size: Cd = 0.6 Clad Temperature A.
ANALYSIS OF RECORD (8/93) 1.
1889 F 2.
Increased T-AVG Uncertainty for RTD Bypass Elimination APCT=
5F i
B.
PRIOR PERMANENT ECCS MODEL ASSESSMENTS APCT=
73 F 1
C.
10 CFR 50.46 Model Assessment (Permanent Assessments of PCT Margin) 1.
LOCABART Spacer Grid Single-Phase fleat Transfer j
Er.or APCT=
15 F l
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l 2.
LOCABART Zirc-Water Oxidation Error APCT=
43 F l
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D.
OTIIER MARGIN ALLOCATIONS 1.
+/- 5 F T-AVG Window APCT=
25 F i
LICEN51NG BASIS PCT + MARGIN ALLOCATIONS PCT =
2050 F Page1ofI