ML20078Q500

Application for Amends to Licenses DPR-77 & DPR-79, Consisting of TS Change 94-07,revising TS 3.7.1.1,Tables 3.7-1 & 3.7-2 & Bases 3/4.7.1.1 Associated W/Max Applicable Power Levels for Operation W/One or More MSSVs Inoperable

ML20078Q500
Person / Time
Site:	Sequoyah
Issue date:	12/16/1994
From:	Shell R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20078Q504	List: ML20078Q500 ML20078Q506
References
NUDOCS 9412220218
Download: ML20078Q500 (3)

Text

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.o IUA Tenneswe Valley Authordy Post Office Boa 2000. Soddy Daisy Tennessee 37379 December 16,1994 TVA-SON-TS-94-07 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemon:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PLANT (SO.N) - TECHNICAL SPECIFICATION (TS) CHANGE 94-07,

" REDUCTION OF MAXIMUM APPLICABLE POWER LEVEL FOR OPERATION WITH ONE OR MORE MAIN STEAM SAFETY VALVES (MSSVs) INOPERABLE" In accordance with 10 CFR 50.90, we are enclosing an amendment to Licenses DPR-77 and DPR-79 to change the TSs of SON Units 1 and 2. The proposed change revises TS 3.7.1.1, ,

Tables 3.7-1 and 3.7-2, and Bases 3/4.7.1.1 associated with maximum applicable power levels for operation with one or more MSSVs inoperable.

TVA has been informed by Westinghouse Electric Corporation that the relationship between rated thermal power and relief capacity of the MSSVs may not be linear under all plant conditions. It is therefore necessary to either reanalyze the plant specific loss-of-load event that may validate current TSs, or revise TSs in accordance with Westinghouse  ;

recommendations taking into account plant specific parameters, to ensure secondary system )

pressures do not exceed the design basis. TVA is proposing to revise the TS to reduce the  ;

applicable power levels when one or more MSSVs are inoperable.

This change also proposes to correct an error in the TS that references Table 3.7-2 instead of Table 3.7-1. In addition to the correction of these errors, there are other changes being proposed, which are a direct result of the effort to become more consistent with NUREG-1431, Standard Technical Specifications, Westinghouse Plants.

in the interim, until this TS change is complete, SON has placed into effect administrative controls to reduce the power range neutron flux reactor trip setpoints with one or more MSSVs inoperable to limit the rated thermal power to levels that are acceptable in i

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l U.S. Nuclear Regulatory Commission Page 2 December 16,1994 accordance with the Westinghouse recommendations and plant specific calculations. These setpoints are more conservative than currently requi.ed by the TSs. l l

The proposed TS change is identified in Enclosure 1. The justification for the proposed TS  !

change is provided in Enclosure 2. A proposed determination of no significant safety  !

hazards consideration performed pursuant to 10 CFR 50.92 is provided in Enclosure 3. l Er. closure 4 is an evaluation performed by Westinghouse.

TVA requests a 45-day implementation period for this TS change following issuance, i

Please direct questions concerning this issue to Steve D. Gilley at (615) 843-7427.  !

Sincerely, i e i R. H. Shell Manager j SON Site Licensing j Swo!I is nfo _

day ofsul9eribed and rE01W7/vL) 1994me before

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%dryi P'ublic nfn6 8 a Aa~ / 'I My Commission Expires 2[/ff[  !

Enclosures i cc: See page 3 '

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- . . -. - - -. .- _ - _ - _- _ __ _ __ _ _ _a

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l U.S. Nuclear Regulatory Commission Page 3 l December 16,1994 cc (Enclosures):

Mr. D. E. LaBarge, Project Manager Nuclear Regulatory Commission  :

One White Flint, North i 11555 Rockville Pike Rockville, Maryland 20852-2739 i

Mr. Michael H. Mobley, Director (w/o Enclosures)  ;

Division of Radiological Health  !

3rd Floor .

L & C Annex [

401 Church Street l Nashville, Tennessee 37243-1532  !

i NRC Resident inspector l Sequoyah Nuclear Plant j 2600 lgou Ferry Road ,

Soddy-Daisy, Tennessee 37379-3624 i Regional Administrator U.S. Nuclear Regulatory Commission "

Region 11  :

101 Marietta Street, NW, Suite 2900 t Atlanta, Georgia 30323 2711  ;

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