ML20248E764

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Forwards Annual Evaluation of Changes & Errors Identified in Abb Combustion Engineering ECCS Performance Evaluation Models Used for LOCA Analyses.Results of Annual Evaluation Documented in Attached Rept
ML20248E764
Person / Time
Site: Waterford Entergy icon.png
Issue date: 06/01/1998
From: Ewing E
ENTERGY OPERATIONS, INC.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20248E768 List:
References
W3F1-98-0102, W3F1-98-102, NUDOCS 9806030441
Download: ML20248E764 (2)


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Ente perations, Inc.

"O Killona. LA 70066 Tet 504 739 6242 Early C. Ewing, m .

k.a ety & ReDulatory Affairs W3F1-98-0102 A4.05 f

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June 1,1998 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555

Subject:

Waterford 3 SES Docket No. 50-382 License No. NPF-38 Annual Report on ABB CE ECCS Performance Evaluation Models Gentlemen:

Pursuant to 10CFR50.46(a)(3)(ii), Waterford hereby submits the annual evaluation of changes and errors identified in the ABB Combustion Engineering (CE) Emergency Core Cooling System (ECCS) performance evaluation models used for Loss-of-Coolant Accident P.OCA) analyses. The results of the annual evaluation are documented in the attached report.

In accordance with 10CFR50.46(a)(3)(i), the sum of the absolute magnitude of the peak cladding temperature changes for the Large Break (LB) LOCA from all previous annual reports was less than 1 F in 1997. The attached report identifies a model error in the decay heat energy redistribution factor (ERF) which changed the peak cladding temperature by 36 F for Waterford. The combined effect of changed facility / fuel inputs to the LBLOCA analysis since the last analysis submitted for NRC approval is 12 F. Thus, the total LBLOCA peak cladding temperature impact for Waterford is 49 F.

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The sum of the absolute magnitude of the peak cladding temperature changes for Small Break (SB) LOCA from all reports to date, except for the effect of changes made to plant inputs, was less than 3 F in 1997 On January 5,1998, Licensee Event Report (LER) 97-033-00 repoited a condition in which the application of a changed plant input to the SBLOCA model resulted in a peak cladding temperature

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i Annual Report on ABB CE ECCS Pe'rforma'nce Evaluation Models l W3F1-98-0102 Page 2 June 1,1998 which exceeded the 2200 F crihria of 10CFR50.46(b)(1). A reanalysis of the SBLOCA performance evaluation using the new Supplement 2 version of the ABB CE Evaluation Model was submitted for review in W3F1-98-0090 on April 30,1998.

As a result of the new methodology used to obtain the SBLOCA results, a request to change Technical Specification 6.9.1.11.1 which lists references to the analytical methods used to determine the core operating limits will be submitted within 90 days of the issuance of the "A" revision of the CE topical report (July 29,1998).

Should you have any questions regarding the attached report, please contact me at (504) 739-6242.

Very truly yours, j -.

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E.C. Ewing Director Nuclear Safety & Regulatory Affairs ECE/BVR/rtk (w/ Attachments) cc: E.W. Merschoff (NRC Region IV)

C.P. Patel (NRC-NRR)

J. Smith N.S. Reynolds NRC Resident inspectors Office 1

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