ML20044G516

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Forwards Suppl 4 to CENPD-279, Annual Rept on C-E ECCS Codes & Methods for 10CFR50.46, Final Rept.Change Involved Conversion of Codes Used for LOCA Analyses from CDC Mainframe Computer to H/P Apollo Computer Workstations
ML20044G516
Person / Time
Site: Waterford Entergy icon.png
Issue date: 05/27/1993
From: Burski R
ENTERGY OPERATIONS, INC.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20044G517 List:
References
W3F1-93-0062, W3F1-93-62, NUDOCS 9306030234
Download: ML20044G516 (2)


Text

'

Entsr;;y Optrcti:ns,Inc.

=-ENTERGY Po rt e KBiona LA 7006o-Tel 504 739 6774 R. F. Burski Dinetw flourSNy Watedora 3 W3F1-93-0062 A4.05 PR May 27, 1993 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 C-E ECCS Codes And Methods For 10CFR50.46 Gentlemen:

This submittal is being made in accordance with 10CFR50.46 in that there has been a change during the year 1992 in the computers used by Combustion Engineering (CE) for their loss Of Coolant Accident (LOCA) methods, which resulted in a slight effect on the calculated peak cladding temperature (PCT)  ;

of Waterford 3 fuel. The change involved the' conversion.of the codes used for LOCA analyses from the CDC mainframe computer to HP/ Apollo computer workstations. The difference in numerical precision between the computers increased the calculated PCT for a large break LOCA by 0.26 F. )

A copy of CENPD-279, Supplement 4 (dated April,1993), entitled " Annual Report On C-E ECCS Codes And Methods For 10CFR50.46," is attached, which addresses the year 1992 changes that are discussed above.

020114 00 93o6o2o234 920s27 PDR R

ADOCK 050003B2 PDR M

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Annual Report On C-E ECCS Codes

'And Methods-For 10CFR50.46 W3F1-93-0062 Pa e 2 M 27, 1993 If you should have any questions regarding this submittal, please contact-Roy Prados at (504) 739-6632.

Very truly yours, r/ g

/ .F.

Director-rski Nuclear Safety RFB/RWP/dc Attachment l

cc: J.L. Milhoan, NRC Region IV i D.L. Wigginton, NRC-NRR l R.B. McGehee )

N.S. Reynolds '

NRC Resident Inspectors Office l

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