ML20154M147
| ML20154M147 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/26/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-88-001, IEB-88-1, NUDOCS 8806010192 | |
| Download: ML20154M147 (4) | |
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 SN 157B Lookout Place lAAY 261988 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 Centlemen:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) - NRC BULLET,f.N NUMBER 88-01 INSPECTION STATUS
References:
1.
NRC Bulletin Number 88-01: Defects in Westinghouse Circuit Breakers, dated February 5,1988 2.
TVA letter to NRC dated February 27, 1988, "Sequoyah Nuclear Plant (SQN) - NRC Bulletin Number 88-01:
Defects in Westinghouse Circuit Breakers" 3
TVA letter to NRC dated March 18, 1988, **Sequoyah Nuclear Plant (SQN) - NRC Bulletin No. 83-01 Schedule Update" t
4.
NRC Ictter to TVA dated Apell 5, 1988, "Responses to NRC Bulletin 88-01 (TAC R00326/R00327)"
This letter is to update NRC with the status of SQN's ongoing inspections of Westinghouse Electric Corporation (W) type DS-206 and DS-416 polo shaft weld inspections as provided to TVA in reference 1.
TVA provided NRC with their current inspection schedule in ref erence 2 and then updated NRC on this schedule and preliminary inspection results in l
reference 3.
NRC requested in reference 4 that TVA immediately identify any problems with other breakers inspected and the corrective actions to be taken for these breakers.
The enclosure provides an updated version of the status previcusly I
transmitted to NRC by telecopy on April 14, 1988.
TVA has completed inspections of the 49 breakers identified in references 2 and 3 that were scheduled to be inspect ed by mid-April 1988. As of May 3, 1988, TVA has completed inspections on 60 W breakers and has installed 41 new polo shafts. Fourteen breakers are currently included under the reinspection criteria in accordance with section 6.2.2 of reference 1.
This number also includes five type DS-206 breakers whose No. 5 welds were approved for operation for the remainder of SQN unit 2 cycle 3 by W.
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An Equal Opportunity Employer
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. ypy 261988 U.S. Nuclear Regulatory Commisslon Currently TVA is planning to continuo scheduling pole-shaft inspecilons and repairs and/or replacements in order to ensure SQN meets the commitments made by reference 2.
This continuation of the work will be determined in a large part by the following factors.
First, the outago of the remaining breakers will be determined by and coordinated with SQN Operations Staff to ensuro plant conditions will allow the breakern and affected equipment to be removed from service without degrading plar.t safety. Second, the availability of roplacement or repaired poln shafts to complete the work will be a factor in order to reduce the number of times the breaker must be removed from servico.. id finally, the normal scheduled workload of the maintenance group involved in theso inspectionc of the pole shaf ts and their repair or replacement will determine the number of inspections done before the next scheduled refueling outage on unit 2.
Unit 1 inspections and rework will continue to be scheduled to meet the unit I restart schedule.
TVA has devolcped a repair procedure to upgrado the wolds to meet NRC Bultatin No. 88-01 requirements. This procedure is currently being evaluated and approved for use in Special Maintenance Instruction 0-317-78 and should be available for implementation within the next month.
Upon cow; tetion of these inspections. TVA will provido NRC with their results in accordance with the requirement provided in referenco 1.
If any o*.*er information 1s required, please telephone B. A. Kimsey at (615) 870-6847.
Very truly yours, TENNESSEB V EY AUTHORITY R. Cridicy, trector Nuclear Licensing and Regulatory Affairs Enclosure cc:
Seu page 3
U.S. Nuclear Regulatory Cocalssion Atcfg6jhhh Enclosure cc (Enclosu.'e):
Mr. K. P. Barr, Acting Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlantc. Georgia 30323 Mr. G. C. Zech, Assistant Director for Projects TVA Ptojects Division U 3 Nuclear Regule;0ry Commissio7 One White Flint, North 11555 Rockvllie Pike Rockville, Maryland 20852 Sequoyah Resident Inapoctor Sequoyah Nuclear Plant 260) Igou Ferry Road Soddy Daisy. Tennessee 37379 l
l
l ENCt05URE
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'i.
504 STATUS SHEET AND INSPECTION RESULTS OF WESTINGHOUSE ELECTRIC CORPORATION (W)05-206 AND -416 BREAKERS INSPECTIONS IN ACCORDANCE WITH NRC BUttETIN NO. 88-01 t
l Breaker Tctal No.
Weld Nos. 2. 3. & 6 Weld Mos. 1. 4. 5. & 7 W Engr No. of New
'No. of No. of Breakers Type DS Inspected Short-Te7 Irspections t W -Tern Inspectiors
-Weld Pole Shafts Pole Shafts Under 6.2.2 to Date 6.1.1 No.
6.1.2 No.
7.1 No. Passed Evaluation Installed Repaired Criteria l
Passed Passed i
416 10 2
6 5
- 1 7
0 2
206
$0 10 23 19 W5 F,
0 7
i Subtotal 60 12 29 24 6
41 0
9 Notes:
Two of the total 60 breakers inspected were spare breakers.
No. 5 weld rejected by W for use. Replaced pole shaft.
W No. 3 welats accepted by W for use through the remainder of SON unit 2 cycle 3.
7 pole shafts were replaced even though they passed the 6.1.2 and 7.' criteria.
2 pole shafts were replaced af ter failing to pass the 6.1.1 criteria only.
The current number of breakers that fall into the reinspection category for a maximum of 2GP cycles of breaker operation is 9 (under 6.2.2) plus the 5 (accepted by W evaluation) for a total of 14 breakers.
Data Da'.e: May 3. 1988
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