ML061100409

Units 1 and 2 - Technical Specifications (TS) Change 05-04, Revision 1 Revision of Allowable Value for Reactor Trip System-Turbine Trip on Low Trip System Pressure

ML061100409
Person / Time
Site:	Sequoyah
Issue date:	03/30/2006
From:	Pace P Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TVA-SQN-TS-05-04
Download: ML061100409 (6)

Text

Tennessee Valley Authority, Post Office Box 2000, Soddy-Daisy, Tennessee 37384-2000 March 30, 2006 TVA-SQN-TS-05-04 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Gentlemen:

In the Matter of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 SEQUOYAH NUCLEAR PLANT (SQN) - UNITS 1 AND 2 - TECHNICAL SPECIFICATIONS (TS) CHANGE 05-04, REVISION 1 "REVISION OF ALLOWABLE VALUE FOR REACTOR TRIP SYSTEM-TURBINE TRIP ON LOW TRIP SYSTEM PRESSURE"

Reference:

TVA letter to NRC dated September 1, 2005, "Sequoyah Nuclear Plant (SQN) - Units 1 and 2 -

Technical Specification (TS) Change 05-04,

'Revision of Allowable Value for Reactor Trip System-Turbine Trip on Low Trip System Pressure'"

This letter provides a revision to the referenced letter to limit the duration of the requested change. Discussions between the NRC and industry groups regarding setpoint methodology concerns have resulted in unresolved issues.

Therefore, the NRC has requested that this change involving the revision of an allowable value in the reactor trip system instrumentation section of the TSs be limited in duration. This limit will allow time for the industry and NRC to come to an agreement on these issues. These agreements will be incorporated into Technical Specification Task Force Traveler 493 that will be available for future efforts associated with this requested change.

PR,tedon recycledpaper

U.S. Nuclear Regulatory Commission Page 2 March 30, 2006 The specific change in this revision is the retention of the current allowable value of 43 pounds per square inch (psicr) with a footnote added that will specify the value to be 39.5 psig. This footnote also specifies that the new value will expire at the end of the respective unit's Cycle 15 operating cycles. The Cycle 15 operating cycles start in spring 2006 for Unit 1 and fall 2006 for Unit 2.

The proposed change is identical to the original request with only the duration being limited and therefore, the original "No Significant Hazards Consideration" continues to be applicable to this request without change.

Additionally, in accordance with 10 CFR 50.91(b)(1), TVA is sending a copy of this letter and enclosures to the Tennessee State Department of Public Health.

There are no commitments contained in this submittal.

If you have any questions about this change, please contact me at 843-7170 or Jim Smith at 843-6672.

I declare under penalty of perjury that the foregoing is true and correct. Executed on this 30th day of March, 2006.

Sincerely,

?. L. Pace Manager, Site Licensing and Industry Affairs

Enclosure:

Proposed Technical Specifications Changes (mark-up) cc: See page 3

U.S. Nuclear Regulatory Commission Page 3 March 30, 2006 Enclosure cc (Enclosure):

Framatome ANP, Inc.

P. 0. Box 10935 Lynchburg, Virginia 24506-0935 ATTN: Mr. Frank Masseth Mr. Donald L. Gillispie.

Grace Glens Farm 3440 Union Church Road Thaxton, Virginia 24174 Mr. Edgar D. Hux 94 Ridgetree Lane Marietta, Georgia 30068 Mr. Lawrence E. Nanney, Director Division of Radiological Health Third Floor L&C Annex 401 Church Street Nashville, Tennessee 37243-1532 Mr. Douglas V. Pickett, Senior Project Manager U.S. Nuclear Regulatory Commission Mail Stop 08G-9a One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2739 Mr. William T. Russell 400 Plantation Lane Stevensville, Maryland 21666

ENCLOSURE TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT (SQN)

UNITS 1 AND 2 Proposed Technical Specification Changes (mark-up)

I. AFFECTED PAGE LIST Unit 1 2-6a Unit 2 2-7 II. MARKED PAGES See attached.

E-1

TABLE 2.2-1 (Continued)

REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SETPOINTS FUNCTIONAL UNIT TRIP SETPOINT ALLOWABLE VALUES

14. Deleted

15. Undervoltage-Reactor 2 5022 volts-each bus 2 4739 volts-each bus Coolant Flumps

16. Underfrequency-Reactor 2 56.0 Hz - each bus 2 55.9 Hz - each bus Coolant FPumps

17. Turbine Trip A. Low Trip System 2 45 psig Pressure B. Turbine Stop Valve 2 1% open 2 1% open Closure

18. Safety Inrection Input Not Applicable Not Applicable from ESF:

19. Intermediate Range Neutron 2 1 x 10-5% of RATED Ž6x 10-6% of RATED Flux - (P-6) Enable Block THERMAL POWER THERMAL POWER Source Range Reactor Trip

20. Power Range Neutron Flux < 10% of RATED THERMAL < 12.4% of RATED (not P-10) Input to Low Power POWER THERMAL POWER Reactor Trips Block P-7 May 16,1990 SEQUOYAH - UNIT 1 2-6a Amendment No. 16, 85,136, 141 E-2

TABLE 2.2-1 (Continued)

REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SETPOINTS FUNCTIONAL UNIT TRIP SETPOINT ALLOWABLE VALUES

b. RCS Loop AT Equivalent to Power > 50% RTP Coincident with*

Steam Generator Water 2 15.0% of narrow range > 14.4% of narrow range Level-Low-Low(Adverse) instrument span instrument span and Containment Pressure < 0.5 psig < 0.6 psig (EAM) or Steam Generator Water 2 10.7% of narrow range > 10.1% of narrow range Level-Low-Low (EAM) instrument span instrument span

14. Deleted

15. Undervoltage-Reactor 2 5022 volts-each bus > 4739 volts - each bus Coolant Pumps

16. Underfrequency-Reactor 2 56 Hz - each bus > 55.9 Hz - each bus Coolant Pumps

17. Turbine Trip A. Low Trip System Pressure 2 45 psig 4g B. Turbine Stop Valve 2 1% open > 1% open Closure

18. Safety Injection Input from Not Applicable Not Applicable ESF

• The allowable value for the Turbine Trip - Low Trip System Pressure is 2 39.5 psig and expires at the end cf the Unit 2 Cycle 15 Operating Cycle.

October 31, 1990 SEQUOYAH - UNIT 2 2-7 Amendment Nos. 7, 76, 132 E-3