ML20154H951
| ML20154H951 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/23/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| GL-83-28, NUDOCS 8805260121 | |
| Download: ML20154H951 (3) | |
Text
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 SN 1578 Lookout Place MAY 231988 U.S. Nuclear Regulatory Commission ATIN:
Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) - GENERIC LETTER (GL) 83-28, ITEM 4.1
RESPONSE
References:
1.
TVA letter to NRC dated November 7, 1983 (SQN Response to GL 83-28) 2.
NRC letter to TVA dated December 18, 1986, "Generic Lotter 83-28, Items 3.1.1, 3.1.2, 3.2.1, 3.2.2, 4.1 and 4.5.1 for Sequoyah" This letter is to provide NRC a final response to GL 83-28, item 4.1, by providing the information requested in reference 2 concerning verification of the undervoltage trip attachments (UVTAs) at SQN for Westinghouse Electric Corporation (W) 08-50 reactor trip breakers (RTBs).
This information consisted of a visual inspection of DB-50 breakers to ensure that post-1972 UVTAs are installed and an inspection of the spare UVTA inventory was conducted before use to ensure that they also were of the post-1972 vintage.
TVA committed to perform the two aforementioned inspections in reference 1.
From discussions with maintenance personnel, a maintenance request (MR) was written to perform visual inspections of SQN's 08-50 breakers to ensure the UVTAs were of the post-1972 vintage.
However, this MR was subsequently not approved because it was decided that an MR was not necessary to perform the visual inspections.
Therefore, the documentation of the visual inspections and confirmation of the results are not available.
TVA does have documentation available to confirm that i
the UVTAs installed in the 08-50 RTBs and bypass breakers are of the post-1972 vintage.
However, this documentation is a result of the replacement of these UVTAs and not a result of the visual inspections comaitted to in reference 1.
The enclosure provides a listing of the l
work requests (hrs) used to perform the UVTA replacements with the l
verified post-1972 UVTAs.
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DCD An Equal opportunity Employer
, MAY 231988 U.S. Nu: lear Regulatory Commission TVA has also verified that the replacement UVTAs purchased from H on Purchase Requisition 84P64-343921 were of the type that incorporated the modifications specified in 14 document number NCD-ELEC-18 dated December 12, 1971. Not only were these modifications incorporated in the UVTAs, but some additional design features that superseded some of those recommended in NCD-ELEC-18 were also included.
The current stock of spare UVTAs is from the above contract and a later contract (85P64-362714).
Therefore, no pre-1972 UVTAs are available at SQN for issue or installation.
Based upon this information, TVA has verified that the UVTAs installed and those in stock are of the post-1972 vintage. This information should provide NRC the final documentation required by reference 2 and complete TVA's response for the Safety Issues Management System item numbers M53098 (unit 1) and H53099 (unit 2).
If further information is required, please telephone B. A. Kimsey at (615) 870-6847.
Very truly yours, TENNESSEE V LLEY AUTHORITY R. Gridley, Di ector Nuclear Licensing and Regulatory Affairs Enclosure cc (Enclosure):
Mr. K. P. Barr, Acting Assistant Director l
for Inspection Programs i
TVA Projects Division l
U.S. Nuclear Regulatory Commission Region II l
101 Marietta Street, NH, Suite 2900 Atlanta, Georgia 30323 Mr. G. G. Zech, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 l
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ENCLOSURE SQN UVTA Replacement Documentation for W Type.DB-50 RTBs Including Bypass Breakers Breaker NR Number UVTA Associated Identification Serial Unit Number Number RT-1 8124615 02YN212-76 Unit 1 RT-2 8124608 02YN212-65 Unit 1 RT-3 8124614 02YN212-72 Unit 2 RT-4 B124613 02YN212-67 Unit 2 BY-1 B124609 02YN212-83 Unit 1 BY-2 B124607 02YN212-85 Unit 1 BY-3 B124616 02YN212-75 Unit 2 BY-4 B124610 02YN212-64 Unit 2 UVTA W Model No. 23A9019G75
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