B12208, Forwards Addendum a to Vol II of Nusco 140-2, Nusco Thermal Hydraulic Model Qualification

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Forwards Addendum a to Vol II of Nusco 140-2, Nusco Thermal Hydraulic Model Qualification
ML20210A578
Person / Time
Site: Millstone, Haddam Neck, 05000000
Issue date: 09/05/1986
From: Opeka J, Sears C
CONNECTICUT YANKEE ATOMIC POWER CO., NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To: Charemagne Grimes, Noonan V, Thadani A
Office of Nuclear Reactor Regulation
Shared Package
ML20210A583 List:
References
B12208, NUDOCS 8609170275
Download: ML20210A578 (2)


Text

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General Offices e Seiden Street, Berlin, Connecticut as **

HAR FORD CONNECTICUT 06141-0210 L L TJ 'J" "',"j' C'$"" (203) 665-5000

. September 5,1986 Docket Nos. 50-213 50-336 50-423 B1220S Office of Nuclear Reactor Regulation Attn: Mr. Christopher 1. Grimes, Director Integrated Safety Assessment Project Directorate Mr. Ashok C. Thadani, Director PWR Project Directorate #3 Mr. Vincent S. Noonan, Director PWR Project Directorate #5 U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Gentlemen:

Haddam Neck Plant Millstone Nuclear Power Station, Unit Nos. 2 and 3 In-house Reload Capability On July 30,1984(l), Northeast Utilities Service Company (NUSCO), on behalf of Connecticut Yankee Atomic Power Company (CYAPCO))and Northeast Nuclear Energy Company (NNECO), submitted a topical report (2 covering NUSCO's use of the VIPRE computer code to perform in-house reloads. The objective of the report is to demonstrate the adequacy of the NUSCO plant modeling techniques to the NRC Staff.

In response to questions received informally from the NRC Staff during their review, enclosed is Addendum A to the NUSCO Topical Report entitled:

o NUSCO 140-2, Addendum A, NUSCO Thermal Hydraulic Model Qualification Volume 11 (VIPRE), August 1986.

This addendum describes the development of an one-eighth-core, nineteen channel, fuel cycle independent VIPRE model for the Haddam Neck Plant. This model is compared to the one-quarter-core model presented in NUSCO 140-2.

The addendum also further evaluates the Rod Ejection Transient.

(1) W. G. Counsil letter to 3. R. Miller and D. M. Crutchfield, dated July 30, 1984,

Subject:

In-house Reload Capability.

(2) NUSCO 140-2, Thermal Hydraulic Model Qualification Volume 11 (VIPRE),

dated July,1984. j DO 8609170275 PDR 860905 t1)

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The one-eighth-core model is shown to be slightly more conservative than the one-quarter-core model in the addendum. Also, the results of the reevaluated Rod Ejection Transient compare well with the FDSA results. The one-eighth-core model was used in the reanalysis of non-LOCA design bapji accidents for the Haddam Neck Plant submitted by letter dated June 30,1986.u1 It is our understanding that the application fee provided with the NUSCO 140-2 topical report also satisfies the fee requirements for this addendum.

Very truly yours, CONNECTICUT YANKEE ATOMIC POWER COMPANY NORTHEAST NUCI. EAR ENERGY COMPANY

b. .D '
3. F. Opeka Senior Vice President U UL-By: C. F. Sears Vice President (3) 3. F. Opeka letter to C. I. Grimes, dated June 30, 1986,

Subject:

Reanalysis of Non-LOCA Design Basis Accidents and included NUSCO Report No.151, "Haddam Neck Plant - Non-LOCA Transient Analysis".

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