ML20155K578

Supplemental Application for Amend to License DPR-77, Revising 880921 Application,Consisting of Tech Spec Change Request 88-28,providing Alternate Format to Implement Heat Flux Hot Channel Factor

ML20155K578
Person / Time
Site:	Sequoyah
Issue date:	10/25/1988
From:	Gridley R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20155K582	List: ML20155K578 ML20155K589
References
TVA-SQN-TS-88-2, NUDOCS 8811010305
Download: ML20155K578 (2)

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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 5N 1578 Lookout Place 00T 251988.

TVA-SQN-TS-88-28 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Hashington, D.C. 20555 Gentlemen:

In the Matter of ) Docket No. 50-327 Tennessee Valley Authority )

SEQUOYAH NUCLEAR PLANT (SQN) UNIT 1 - TECHNICAL SPECIFICATION CHANGE 88 ADDITIONAL INFORMATION I

Reference:

TVA letter to NRC dated September 21, 1988, "Sequoyah Nuclear Plant (SQN) Unit 1 - Technical Specification Change 88-28" i

The reference transmitted a proposed reduction in the heat flux hot channel factor (Fo[z]) from 2.237 to 2.15. The F,(z) reduction was proposed to obtain additional peak clad temperature (PCT) margin in support of the reduced minimum injected upper head injection (UHI) water volume described 'n technical specification change 88-20 dated August 15, 1988.

It is TVA's intention to increase the F,(z) limit back to 2.237 after completion of a supporting analysis by Westinghouse Electric Corporation (H).

With the format proposed by technical specification 88-28, increasing F,(z) would require an additional technical specification change. This additional change would probably be pursued on an expedited schedule, which could result in the inefficient use of TVA and NRC resources.

An alternate format to implementing the Fn(z) reduction is provided as an enclosure. A footnote is used to indicate the temporary reduction in the F,(z) limit until completion of the supporting H analysis. At that time, the footnote expires, and the limit is increased to 2.237. The footnote can then be deleted at a later time that is prudent for both TVA and NRC. The change in format is an administrative r5ange only and does not alter any of the conclusions drawn in the reference.

8G11010305 881025 PDR ADOCK 05000327 P PDC g3 0 An Equal opportunity Employer l{g

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' ' U.S. Nuclear Regulatory Commission OCT 251988 Please direct. questions concerning this issue to R. R. Thompson at (615) 870-7470.

Very truly yours, TENNESSEEVqLLEYAUTHORITY

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, f R. Gridley, Ma/fager Nuclear Licensing and Regulatory Affairs Sworn to d subscrl)9d jefore me th! , ay of 6/dC 1988 1 A n k l s t ' Y //

' Notary Public.

My Commission Expires d!7fhe I i Enclosure cc (Enclosure):

Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Filnt, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. F. R. McCoy, Assistant 01 rector for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. Michael H. Hobley, Olrector (w/o enclosures)

Division of Radiological Health T.E.R.R.A. Building 150 9th Avenue, N Nashville, Tennessee 37203 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 American Nuclear Insurers Attention: Librarian The Exchange, Suite 245 270 Farmington Avenue farmington, Connecticut 06032