ML20153F947
| ML20153F947 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/02/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-79-14, NUDOCS 8809070551 | |
| Download: ML20153F947 (4) | |
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA, TENNESSEE 37401 SN 1578 Lookout Place SEP 021988 U.S. Nuclear Regulatory Commission ATIN: Document Control Oesk Washington 0.C.
20555 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 - COMPARISON OF UNITS 1 AND 2 HANGER PROGRAM RESULTS NRC Project Manager, Jack Donohew, requested that TVA provide a comparison of the results of the units 1 and 2 hanger programs.
The request came as a result of some questions raised regarding the information on hanger modifications presented at the August 4, 1988 meeting with the NRC Commissioners. The results of the two programs were similar. The details are presented in the enclosure to this letter.
Very truly yours, TENNESS E val E AUTHORITY
/
R. G idley, Mana er l
Nuclear Licenst g and Regulatory A fairs Enclosure cc: See page 2 3
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PNU 04 1
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An Equal Opportunity Employer
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U.S. Nuclear Regulatory Commission Slip 021908 cc (Enclosure):
Ms. S. C. Black, Assistant Director for Projects TVA Projects Olvision U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. F. R. McCoy, Assistant Olrector for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Harletta Street, NW, Suite 2900 Atlanta, Georgia 30323 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379
m ENCLOSURE SEQUOYAH NUCLEAR PLANT COMPARISON OF THE UNITS I AND 2 HANGER PROGRAM RESULTS gackground During the restart period for unit 2, discussions on hanger modifications were focused on the number of modifications resulting from the civil calculation regeneration program. Other hanger work had occurred but was not the subject of discussions.
The hanger work was reorganized on unit I to improve efficiency and tecountability.
This resulted in the assignment of one organization to be responsible for all unit I hanger fieldwork. As part of this effort, all hanger work was tracked together to monitor performance.
The information presented to the NRC Commissioners represented the total unit I hanger work scope.
This total included maintenance rework and miscellaneous hanger modifications, in addition to the hanger modifications that resulted from the civil calculation regeneration program.
These totals are not directly comparable with the unt' 2 numbers reported during unit 2 restart.
Comp _arison of Unit I and Unlt 2 Programs 1.
The results of the civil calculation regeneration program are as follows:
Common and Unit 1 Unit 2 Restart Modifications 125 (note 1) 220 Postrestart Modifications 225 (note 2) 475 Note 1 - This number is based on an estimate of the number of modifications attributed solely to the civil calculation regeneration program.
Approvimately 190 modifications were required to resolve both the calculation program and NRC Bulletin 79-14.
Note 2 - This number is the current estimate and may be reduced as a result of refinements to the calculations.
2, Miscellaneous hanger modifications were made to support other design changes unrelated to hanger deficiencies.
Connon and Unit 1 Unit 2 Miscellaneous Hodifications 91 35 (note 3)
Note 3 - These numbers are estimated as of August 15, 1988.
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2 3.
Maintenance rew:rk was performed on hangers as a result of 59"eral inspection programs (i.e., bolting program, calculation regeneration program, and NRC Bulletin 79-14).
The maintenance-type work did not involve design changes or modifications to the hangers.
The work was typlcally bolt replacexent, bolt tightening. and clearance adjustments.
Conmon and Unit 1 Unit 2 Maintenance Rework 1328 1295 (note 4)
Note 4 - These numbers are estimated as of August 15, 1988.
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