ML20087D375

Application for Amends to Licenses DPR-77 & DPR-79,revising Time Constants for Overtemp Delta Temp & Overpower Delta Temp Equations

ML20087D375
Person / Time
Site:	Sequoyah
Issue date:	08/07/1995
From:	James Smith TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20087D378	List: ML20087D375 ML20087D380
References
NUDOCS 9508100301
Download: ML20087D375 (4)

Text

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e nn Tennessee Valley Autnority. Post Ottce Box 2000, Soddy Daisy Tennessee 37379 August 7,1995 TVA-SON-TS-95-11, R1 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PLANT (SON) - TECHNICAL SPECIFICATION (TS)

CHANGE 95-11, REVISION 1, " REVISED TIME CONSTANTS FOR THE OVERTEMPERATURE DELTA TEMPERATURE (OTAT) AND OVERPOWER DELTA TEMPERATURE (OPAT) EQUATIONS"

Reference:

TVA letter to NRC dated April 6,1995, "Sequoyah Nuclear Plant (SON) - Technical Specification (TS) Change 95-11, ' Relocation of the Overtemperature and Overpower Delta Temperature Equation Constants to the Core Operating Limits Report (COLR)'"

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 the numerical value for the time constant 74 found in the OTAT and OPAT equations of TS Table 2.2-1. These changes superseded the changes requested in the referenced letter.

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. The Westinghouse Electric Corporation evaluation supporting this change is provided in Enclosure 4.

1 1CCC54 9500100301 950807 PDR ADOCK 05000327 O d P PDR

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e U.S. Nuclear Regulatory Commission Page 2 August 7,1995 SON Unit 2 is presently operating at 99.5 percent reactor power to reduce the potential for inadvertent turbine runback and reactor trip signals because of the spurious OPAT channel actuations. These actuations are associated with the j upper plenum anomaly phenomenon and the high gain presently assigned to the lead-lag compensator for measured AT. Operating the unit at the reduced power level is a concern from a cost benefit standpoint. Therefore, TVA requests expedited NRC review and approval for the proposed changes to support timely implementation of the new analysis.

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

Please direct questions concerning this issue to Keith Weller at (615) 843-7527.

Sincerely, M

J. D. Smith Acting Manager <

SON Site Licensing -

worn tg and subscjr' ped befpre me th 71- day of Uhd/M 1995 WV71 bY. / lit 1 Notar/ public '

My Commission Expires Ebd/ /k Enclosures cc See page 3

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'U.S. Nuclear Regulatory Commission Page 3 August 7,1995 l

(Enclosures):

Mr D. E. LaBarge, Project Manager Nucl ear Regulatory Commission One White Filnt, North <

11555 Rockville Pike l 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 Nashville, Tennessee 37243-1532 NRC Resident inspector l Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 .j Regional Administrator

• i U.S. Nuclear Regulatory Commission Region ll 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 l

l l

k 1

1 I

ENCLOSURE 1 PROPOSED TECHNICAL G?ECIFICATION (TS) CHANGE SEQUOYAH NUCLEAR PLANT (SON) UNITS 1 AND 2  !

DOCKET NOS. 50-327 AND 50-328 (TVA-SON-TS-95-11, REVISION 1) i 1

LIST OF AFFECTED PAGES

_V11!L1 I l

2-7 I 2-8 I

'l 2-9 2-10 Unit 2 l l

2-9 2-10 2-11 1