ML20092K663

Application for Amend to License DPR-77,consisting of TS Change 92-02, Rev of Overtemp (OT) Differential Temp (Delta Temp),Overpower (OP) Delta T, & RCS Loop at Delta T Allowable Values & Calibr Requirement... Per 10CFR50.90

ML20092K663
Person / Time
Site:	Sequoyah
Issue date:	02/20/1992
From:	Joshua Wilson TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20092K666	List: ML20092K663 ML20092K674
References
NUDOCS 9202250317
Download: ML20092K663 (2)

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February 20, 1992

'IV A-SQN-TS-92-02 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

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

SEQUOYAH NUCLEAR PLANT (SQN) - UNIT 1 - TECHNICAL SPECIFICATION (TS)

CHANGE 92-02, " REVISION OF OVERTEMPERATURE (OT) DIFFERENTIAL TEMPERATURE (AT),

OVERPOWER (OP) AT, AND REACTOR COOLANT SYSTD1 (RCS) LOOP AT ALLOWABLE VALUES AND CALIBRATION REQUIREMENT FOR RCS RESISTANCE TEMPERATURE DETECTORS (RTDs)"

In accordance with 10 CFR 50.90, we are enclosing a requested amendment to License DPR-77 to change the TSs of SQN Unit 1. The proposed change will revise the allowable values for OTAT, OPAT, and RCS loop AT items in Tables 2.2-1 and 3.3-4 for reactor trip and engineered safety feature functions. Additionally, the 18-montn requirement for calibration of functions in Tables 4.3-1 and 4.3-2 associated with RCS RTDs is revised to utilize a technical evaluatica in lieu of a cross-calibration of RTD sensors.

The requested changes are for Unit 1 Cycle 6 operation only.

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 hazards consideration performed pursuant to 10 CFR 50.92 is  ;

provided in Enclosure 3. Westinghouse Electric Corporation Safety Evaluation Check List 91-459, Revision 2, is provided in Enclosure 4 to support the justification for this TS change and the significant hazards consideration I conclusions.

The need for this change was initially discussed with NRC during a telephone call on December 26, 1991. NRC agreed that the use of administrative controls to implement the more conservative allowable values would be acceptable until ,

! a TS change can be processed. In addition, the NRC Region II Inspection I No. 50-327/92-01 conducted January 6-10, 1992, concluded that TVA's approach l to the concerns with SQN temperature-monitoring instrumentation and the TS change in allowable values is acceptable. I 9202250317 920220 PDR l ADOCK 05000327 .

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4 U.S. Nuclear Regulatory Commission Page 2

February 20, 1992

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1 TVA requests expedited NRC review and approval of this TS change in order 3

to support a March 30, 1992 date that correlates with the 25 percent surveillance requirement extensinn provided by TS 4.0.2.a for RCS RTD calibrations associated with OT47, OPAT, and RCS loop AT functions. Review

, of this TS change by TVA's Nuclear Safety Review Board (NSRB) will be

, obtained in parallel with NRC review. Any possible changes to this TS j change request resulting from NSRB review would be provided to NRC in an expedited manner.

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

Sincerely, l

'  ?,

& $IVL

'J L. Wilson i

Sworn to nd subsc ib d before me 1 this _2' day _01- tWMgs/j1992 1UN ).kd2%b{

Notary Public ((

l.

My Commission Expires Td4-(K Enclosures-l cc (Enclosures):

{ Mr. D. E. LaBarge, Project Manager i U.S. Nuclear Regulatory Commission

! One White Flint, North

, 11555 Rockville Pike Rockville, Maryland 20852 i

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

Division of Radiological llealth i T.E.R.R.A. Building 150 9th Avenue, N

. Nashville, Tennessee 37203 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 i

Mr. B. A. Wilson, Project Chief U.S. Nuclear Regulatory Commission Region II i

101 Marietta Street, NW,-Suite 2900

! Atlanta, Georgia 30323

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