ML20138G740
| ML20138G740 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 12/27/1996 |
| From: | Diprofio W NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NYN-96090, NUDOCS 9701020237 | |
| Download: ML20138G740 (4) | |
Text
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p 1 North North Atlantic Energy Service Corporation
',)j Atlantic P.O. Box 300 se sreet. sii O3874 0
(603) 474-9521 The Northeast Utilities Systern l
December 27,1996 Docket No. 50-443 NYN-96090 '
l United States Nuclear Regulatory Commission
' Attention: Document Control Desk l
Washington, D.C. 20555 l
Seabrook Station
]
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' 10 CFR 50.46 Annual Renort l
North Atlantic Energy Service Corporation (North Atlantic) has enclosed herein, pursuant to 10CFR50.46(a)(3), the 1996 Annual Report of Emergency Core Cooling System (ECCS) Evaluation
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.Model Revisions / Errors. The enclosure includes a tabulation of the Large Break LOCA and Small Break i
LOCA Peak Clad Temperature (PCT) margin allocations applicable to Seabrook Station. The PCT margin allocations reported in the enclosure represent permanent PCT margin allocations attributable to ECCS evaluation model revisions / errors and plant specific input assumption allocations through the period June 24,1996 as reported to North Atlantic by Westinghouse on July 8,1996 in NAH-96-220.
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Should you have any questions regarding this letter, please contact Mr. Anthony M. Callendrello, Licensing Manager, at (603) 773-7751.
Very truly yours, 1
NORTH ATLANTIC ENERGY SERVICE CORP.
b e010051 liain A. dip fy' ~
Unit Director l
cc:
H. J. Miller, Region I Administrator A. W. De Agazio, Senior Project Manager J. B. Macdonald, NRC Senior Resident inspector i
i ADDji 9701020237 961227 PDR ADOCK 05000443;.
F PDR '
4 9
e ENCLOSURE TO NYN-96090 1
1 l
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b Small Break Peak C8-d Temperature Margin Utilization ECCS EVALUATION MODEL REVISIONS / ERRORS 10CFR50.46 ANNUAL REPORT 1996 Eval. Model:
NOTRUMP Fuel: 17 x 17 V511 FQ=2.5 FdH=1.65 SGTP=13%
Clad Temnerature A.
ANALYSIS OF RECORD (8/93) 1.
1082 *F 2.
Increased T,y, Uncertainty for PTD Bypass Elimination APCT=
8 F B.
PRIOR PERMANENT ECCS MODEL ASSESSMt..- ' ' #
APCT=
28 F C.
10CFR50.59 SAFETY EVALUATIONS 1.
PSV/MSSV Setpoint Tolerance Relaxation' APCT=
5 'F D.
199610CFR50.46 MODEL ASSESSMENTS (Permanent Assessment of PCT Margin) 5 l
1.
SBLOCTA Fuel Rod initialization Error APCT=
10 'F E.
OTHER MARGIN ALLOCATIONS e
1.
EFW Actuation on SI Signal Only 5 'F LICENSING BASIS PCT = MARGIN ALLOCATIONS PCT =
1138 F
' NAH-94-202," North Atlantic Energy Service Corporation Seabrook Station,10CFR50.46, Notification and Reporting information," February 8,1994.
2 NAH-94-229," North Atlantic Energy Service Corporation Seabrook Station, SBLOCTA Axial Nodalization," October 27,1994.
3 NAH-96-204," North Atlantic Energy Service Corporation, Seabrook Station,10CFR50.46 Annual Notification and Reporting," February I?,1996.
- Amendment 15 to Facility Operating License NPF-86, September 3,1992.
8 NAH-96-220," North Atlantic Energy Service Corporation Seabrook Station,10CFR50.46 Small Break LOCA Notification and Reporting," July 8,1996.
6 NAH-95-230," North Atlantic Energy Service Corporation, Seabrook Station, Evaluation ofImpact of LOCA Related Analyses of EFW Start on SI Signal vs. Loss of Power Signal, November 17,1995.
r
(
Large Break Peak Clad Temperature Margin Utilization ECCS EVALUATION MODEL REVISIONS / ERRORS 10CFR50.46 ANNUAL REPORT 1996 Eval. Model:
NOTRUMP Fuel: 17 x 17 V5H FQ=2.5 Fdll=1.65 SGTP=13%
Clad Temperature A.
ANALYSIS OF RECORD (8/93) 1.
1889 'F 2.
Increased T,, Uncertainty for RTD Bypass Elimination APCT=
5 'F B.
PRIOR PERMANENT ECCS MODEL ASSESSMENTS'#
APCT=
58* F C.
10CFR50.59 SAFETY EVALUATIONS APCT=
0 F D.
199610CFR50.46 MODEL ASSESSMENTS (Permanent Assessment of PCT Margin)
APCT=
0 'F r
b LICENSING BASIS PCT = MARGIN ALLOCATIONS PCT =
1952 *F i
- Does not include Hot Leg Nozzle Gap Benefit (-142 F) reported in 1995, North Atlantic letter NYN-96086, dated October 26,1995.
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' NAll-94-204," North Atlantic Energy Sc.vice Corporation, Seabrook Station,10CFR50.46 Notification and Repodir.;; !nSr. nation," February 8,1994.
2 NAll-95-219," North Atlantic Energy Service Corporation, Seabrook Station, LOCA Axial Power Shape Sensitivity Model," August 14,1995.