ML20082E401

Application for Amends to Licenses DPR-77 & DPR-79, Consisting of TS Change 95-11,relocating Overtemp & Overpower Delta Temp Equation Constants to COLR

ML20082E401
Person / Time
Site:	Sequoyah
Issue date:	04/06/1995
From:	Shell R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20082E409	List: ML20082E401 ML20082E432
References
NUDOCS 9504110219
Download: ML20082E401 (3)

Text

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TenneSSe6 Valley Authonty. Post Othee Box 2000. Sodoy-Daisy. Tennessee 37379 April 6,1995 TVA-SON-TS-95-11 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, " 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 relocates the numerical value for the constants found in the overtemperature delta temperature (OTAT) and overpower delta temperature (OPAT) equations of TS Table 2.2-1 to the COLR This change affects the location of the "K" and "r" numerical values in these equations to allow changes under the 10 CFR 50.59 provisions without having to process a license amendment request. This revision will also add lag compensators to these equations that are presently omitted. This will allow the use of these compensators if future analysis indicates that it is appropriate.

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 j 10 CFR 50.92 is provided in Enclosure 3.  ;

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-9504110219 950406 i PDR ADOCK 05000327 l l P- PDR

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,m U.S. Nuclear Regulatory Commission- .

Page 2-  ;

April 6,1995 - -

L SQN Unit 2 is presentlyLoperating at 99 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.

upper plenum anomaly phenomenon and the high gain presently assigned to 1 the lead-lag compensator for measured AT. Operating the unit at the reduced- 'l'

- power level is a concern from a cost benefit standpoint. Westinghouse Electric

' Corporation is pursuing a revised SON analysis that will reduce the gain for the

, measured AT lead-lag compensator and other r changes to provide appropriate ,

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margin for the OPAT function. SON plans to implement the revised analysis in '

June 1995, when the Westinghouse effort is scheduled to be completed.

Therefore, TVA requests expedited NRC review and approval for.the proposed  ;

changes to support timely implementation of the new analysis in accordance with the 10 CFR 50.59 requirements.

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Please note that this change is modeled after similar amendments requested by the Catawba Nuc' ear Station and approved by NRC in a letter dated 1 March 25,1994.  ;

TVA requests a 30-day implementation perio'd for this TS change following issuance.

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

Sincerely, I '

R. H. Shell Manager SON Site Licensing Swor ,tp and subs ibed pfore me this day of /2 X 1995 HX11 $ if h

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1 Nota'ry Public My Commission ExpiresM[c //h Enclosures cc: See page 3 i-l l

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J',I U.S. Nuclear Regulatory Commission Page 3 -

' April 6,1995 -

. m (Enclosures)i Mr. D. E. LaBarge, Project Manager '

Nuclear Regulatory Commission One White Flint, North 11555'Rockville Pike - -

Rockville, Maryland 20852-2739 -

t Mr. Michael H. Mobley, Director (w/o Enclosures) l Division of Radiological Health

,3rd Floor  !

'l & C Annex 401 Church Street Nashville, Tennessee 37243-1532 NRC Resident inspector

>- Sequoyah Nuclear Plant i 2600 Igou Ferry Road . .

Soddy-Daisy, Tennessee 37379-3624 .

Regional Administrator

.U.S. Nuclear Regulatory Commission Region 11 101' Marietta Street, NW, Suite 2900 i Atlanta, Georgia 30323-2711

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