ML20149F790

Forwards Commitments Describing TVA Plans for Addressing long-term Actions Re GL 89-10,per Insp on 970609-19.Status Will Be Provided by End of Dec 1997 Informing of Progress in Completing long-term Commitments

ML20149F790
Person / Time
Site:	Sequoyah
Issue date:	07/08/1997
From:	Bajestani M TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-89-10, NUDOCS 9707220302
Download: ML20149F790 (6)

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o Tennessee valley Authority. Post Office Box 2000. Soddy Dasy. Tennessee 37379-2000 Masoud Bajestani Site Vice President Sequoyah Nuclear Plant July 8,1997 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 '

l Gentlemen:

In the Matter of

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Docket Nos. 50-327 Tennessee Valley Authority

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50-328 SEQUOYAH NUCLEAR PLANT (SQN)- COMMITMENTS REGARDING GENERIC LETTER (GL) 89-10 PROGRAM CLOSURE On June 9 through June 19,1997, NRC conducted an inspection (Inspection Report 97-06) of SQN's GL 89-10 program. The inspection team identified nine long-term j

actions to improve SQN's GL 89-10 program. These actions are as follows:

1. Strengthen group valve factors

2. Validate Pratt butterfly calculations

3. Update valve switch setting sheets

4. Velan globe valve factor - reconcile with test data

5. PORV block valve - additionaljustification needed for blowdown conditions

6. Provide plan to verify orientation and run PPM on 1,2-FCV 72-2 and -39

7. Addition of 5 percent margin for valve degradation to the calculations

8. Limit switch control - provide 10 percent rate of loading until further evaluation is i

available j

9. Provide plan for 2-FCV-68-332/333 actuator structural capability NRC requested that TVA provide a commitment letter describing TVA's plans for addressing these long-term actions. The inspection team indicated that the NRC staff would evaluate SON's GL 89-10 program for closure upon receipt of this commitment f

i letter.

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CU 9707220302 970708 PDR ADOCK 05000327 l l Oh!!

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t U.S. Nucirtr R!gulatory Commission Page 2 l

July 8,1997 t

Enclosed are TVA commitments that describe TVA's plans for addressing the nine long-term actions. In addition, TVA plans to provide a status letter by the end of December 1997 to inform you of progress in completing the long-term commitments. Notification will be provided in the December letter regarding the anticipated date for completion of any remaining commitments that would extend into 1998.

TVA requests that NRC provide notification of SQN's GL 89-10 program status following your review of the enclosed information.

If you have questions conceming this issue, please cenact D. V. Goodin at (423) 843-7734.

Sincerely, ft.&

w Masou ajestani Enclosure cc:

Mr. R. W. Heman, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 NRC Resident inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 Regional Administrator U.S. Nuclear Regulatory Commission Region il Atlanta Federal Reserve 61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia 30303-3415 l

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i ENCLOSURE SEQUOYAH NUCLEAR PLANT TVA COMMITMENTS 1.

_ Action:

Strengthen group valve factors for gate valves.

Commitment:

TVA will revise gate valve calculations to incorporate a 0.6 valve factor unless differential pressure test data is available to indicate a valve factor other that 0.6. This commitment will be completed by November 7,1997.

Note: For any gate valve groups that have less than acceptable differential pressure (dp) test data to support a 0.6 valve factor, TVA plans to evaluate industry dp test data to justify existing valve ' : tors.

2. Action:

Validate the Pratt butterfly calculations.

Commitn.ent: TVA will participate in a butterfly valve test program with Duke Power Company or obtain appropriate test data from other sources (i.e., Kalsi Engineering or Duke Engineering Services) to validate Pratt design information. The validation will be completed by December 31,1997.

Note: TVA has reevaluated the data associated with SON's GL 89-10 butterfly valves. This reevaluation determined that the available margin for these val"7s is greater than 30 percent.

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3. Action:

Update valve switch-setting sheets.

Commitment: TVA will issue a design change notice (DCN) to update the valve switch-setting sheets after calculations are completed. The l

DCN for both units will be completed by December 1,1997.

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4. Action:

Reconcile Velan 1.0 globe valve factor (closing) with test data.

Commitment: TVA will review differential pressure test data to determine if a factor of 1.0 (in the closing direction) is appropriate for SON's Velan globe valves. The review will be completed by September 30,1997.

5.

Action:

Provide additional justification for SON's PORV block valve capability under blowdown conditions.

Commitment:

TVA will perform maintenance improvements (e.g., radius internal valve edges, check internal valve clearances, ensure proper alignment, inspect valve seat, etc.) and perform the EPRI Performance Prediction Program (PPP) for SON's PORV block valves. This commitment will be complete for Unit 2 before restart from the Unit 2 Cycle 8 refueling outage (currently scheduled for November 4,1997). This commitment will be complete for Unit 1 before restart from the Unit 1 Cycle 9 refueling outage (currently scheduled for October 19,1998).

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6. Action:

Provide a plan to verify orientation and perform PPM on 1,2-FCV-72-2,-39.

Commitment: TVA will determine improvements (i.e., obtain additional test data or perform the EPRI PPP) for valve factors and other margins associated with these valves. This commitment will be l

completed by September 30,1997.

7. Action:

Provide a 5 percent margin for valve degradation to SON's valve calculations.

Commitment: TVA will add a 5 percent margin as a minimum requirement for valve degradation. This commitment will be completed by November 7,1997.

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8. Action:

Provide a 10 percent rate of loading (ROL) for limit switch contro; until further evaluation is available.

Commitment: TVA will add a 10 percent margin for ROL (until further evaluation is available). This commitment will be <:omplete by November 7,1997.

9. Action:

Provide plan for 2-FCV-68-332/333 actuator structural capability.

Commitment: TVA will revise SON calculations to provide an increase in the 1

torque rating. This commitment will be complete by November 7, 1997.

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10. Commitment: TVA will submit a progress letter to NRC to provide an up-to-date status of the commitments d3 scribed above. This letter will be submitted by December 31,1997.

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