ML19327C203
| ML19327C203 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 11/10/1989 |
| From: | Shelton D TOLEDO EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 1-897, IEB-79-27, TAC-68102, NUDOCS 8911210155 | |
| Download: ML19327C203 (3) | |
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TOLEDO
%mm EDISON A Centerw Dwgv Cornpany DONAU) C. SHELTON
- Docket Number 50-346 w= w an-na.r (419)P401300
- License Number NPF-3 Serial Number 1-897 November 10, 1989 1
United States Nuclear Regulatory Commission Document Control Desk l
Washington, D. C. 20555 l
Subject:
' Response to the NRC Safety Evaluation on the Davis-Besse Nuclear Power Station Audit for Verification of Resolution of IE Bulletin 79-27 Concerns (TAC Number 68102)
I Gentlemen The subject audit safety evaluation was issued by the Nuclear Regulatory Commission (NRC) on September 12, 1989 (Toledo Edison Log Number 1-2148).
Based on the safety evaluation, the NRC Staff concluded that Toledo Edison had adequately resolved the concerns of IE Bulletin 79-27, " Loss of Non-Class IE Instrumentation and Control Power System Bus During Operation", for the Davis-Besse Nuclear Power Station (DBNPS). However, the report contains an open issue relating to an apparent lack of testing of automatic bus transfer (ABT) switches at the DBNPS. 'During the audit' exit meeting, the audit team requested that Toledo Edison evaluate' periodic testing of these switches. The audit safety evaluation subsequently requested that Toledo (dison report the results of the evaluation in writing.
i Toledo Edison agrees with the NRC audit team that periodic testing of ABT
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switches vould be prudent. Toledo Edison recently completed an evaluation and review of periodic testing of'ABT switches at the DBNPS and determined that 10
- of the identified 17 ABT switches were being tested during existing periodic tests or preventive maintenance activities. These switches are listed in the attachment under the listing titled "ABT Switches Ulth Existing Test Procedures."
The review did not identify existing proceduralized testing requirements for i
seven ABT switches.
These seven ABT switches are listed in the attachment under the listing titled "ABT Switches Without Existing Test Procedures."
Preventive maintenance or periodic test procedures as applicable are being developed for testing of these seven ABT switches.
The test frequency for each of these seven ABT switches is anticipated to be at least each refueling outage starting from.the first test during the sixth refueling outage.
8911210155 891110 h
PDR ADOCK 05000346 Q
PDC THE TOLEDO EDISON COMPANY EOISON PLAZA 300 MADISON AVENUE TOLEDO, OHIO 43652 g
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Dock 5t Nu;ber 50-346 c.,
License Number NPF-3 l
Serial-Number'l-897 1'
Page'2' 5
e Should further information be required, please contact Mr. R. V. Schrauder, r
!"u Nuclear Licensing Manager, at (439) 249-2366.
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Very truly youcs, 4/t/
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GBK/ssg.
cc P. M. Byron, DB-1 NRC Senior Resident Inspector
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A. B.'Duvis, Regional Administrator, NRC Region III T. V. Vambach,. NRC/NRR DB-1 Senior Project Manager 1
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- ,~Lic nse Nu:b r NPF Serial Number 1-897 Attachment J
Page 1-1 ABT Switches Vith Existing Test Procedures ABT Number System.
Test Frequency D3002 Microvave Tover 3 Months BE31ATS 480 Volt A.C.
6 Months BF31ATS 480 Volt A.C.
6 Months YVA 120 Volt A.C.
Refueling YVB 120 Volt A.C.
Refueling N/A Integrated Control Refueling System (ICS)
N/A Non-Nuclear Refueling Instrumentation (NNI) l N/A Non-Nuclear Refueling Instrumentation (NNI)
I (Note: There cre two ABT switches in the Security A.C. system whits are being periodically tested.)
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I ABT Switches Without Existing Test Procedures ABT Number System Test Frequency
- D37El Plant Lighting Refueling D41El Plant Lighting Refueling D49El Plant Lighting Refueling j
D57El Plant Lighting Refueling EF41 Fire Protection Refueling j
YSV001 Station Annunciators Refueling j
YATS4601 Station Computer Refueling i
- This is the minimum test frequency which vill be implemented. A shorter frequency may be established in the finalized procedure.
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