ML13331A256
| ML13331A256 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/03/1988 |
| From: | Medford M SOUTHERN CALIFORNIA EDISON CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-88-001, IEB-88-1, NUDOCS 8805090207 | |
| Download: ML13331A256 (6) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 M. 0. MEDFORD TELEPHONE MANAGER OF NUCLEAR ENGINEERING May 3, 1988 (818) 302-1749 AND LICENSING U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention:
Mr. John B. Martin, Regional Administrator
Dear Sir:
Subject:
Docket No. 50-206 IE Bulletin 88-01 San Onofre Nuclear Generating Station Unit 1 In response to NRC Bulletin 88-01: "Defects In Westinghouse Circuit Breakers,"
a review has been conducted and it has been confirmed that Westinghouse DS-206 and DS-416 circuit breakers are utilized at San Onofre Unit 1 in Class 1E applications. The DSL-206, DSL-416 or DS-420 type breakers are not in use at San Onofre Unit 1. These circuit breakers are the subject of the IE Bulletin.
Provided as an enclosure are the results of SCE's inspection of the DS-206 and DS-416 circuit breakers at San Onofre Unit 1.
Subscribed on this 3rd day of May
, 1988.
Respectfully submitted, Sub!cribed an sworn to before me this S
day of OFFiCIAL SEAL C.SALLY SEBO Notary Public-California LOS ANGELES COUNT'r My Comm. Exp. Apr. 20, 1990 Notary Public 1 and for the County of LOS ANGELES COUN-Los Angeles, State of California Enclosure cc:
J. B. Martin, Regional Administrator, NRC Region V F. R. Huey, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3 8805090207 880503 POR ADOCK 05000206 Q
Response to NRC Bulletin 88-01 SCE Report on Westinghouse DS Breaker Inspections In accordance with the reporting requirements of this bulletin, the following data includes the breakers of each type inspected, the breakers of each type requiring corrective actions due to pole shaft welds not meeting the acceptance criteria, and the breakers of each type requiring corrective actions due to mechanism alignments not meeting the acceptance criteria. As San Onofre Unit 1 was in a mid-cycle outage, the breaker data contains all short-term and some long-term inspection results.
Those breakers awaiting pole shaft replacement are spare breakers and will not be utilized in the plant. A follow-up report will be forwarded within 30 days after completion of the outstanding long-term inspections.
Summary of San Onofre Unit 1 Breaker Inspections Breaker Model..........................
DS-206 Quantity........
Passed All Inspections
.Failed Short-Term Weld Inspections..............4 Failed Short and Long-Term Weld Inspections..........
4 Failed Alignment Check....................
0 Replaced Shaft/Completed All Inspections............
7 Awaiting Shaft Replacement/Final Inspection.....
Breaker Model.................
- 9.
DS416 Quantity.............................
..4 Passed All Inspections.
Failed Short-Term Held Inspections..............
...2 Failed Short and Long-Term Weld Inspections.
Failed Alignment Check..
0 Replaced Shaft/Completed All Inspections Awaiting Shaft Replacement/Final Inspection............
2
-2 San Onofre Unit 1 Detailed Breaker Inspection Results Breaker ID..
Sl-52-1130 Type....
DS-206 Short-Term Weld Inspections.
Pass Long-Term Weld Inspections.
Pass Long-Term Alignment Check..
Pass Breaker ID...................
Sl-52-1129 Type..
DS-416 Short-Term Weld Inspections.......
Pass Long-Term Weld Inspections Pass Long-Term Alignment Check.......
Pass Breaker ID............................1-52-1125 Type..
.............. DS206 Short-Term Weld Inspections (Welds 2,3,6)............
Fail Comment:
Welds 2, 3 and 6 failed due to weld size and lack of fusion.
Pole shaft replaced.
Long-Term Weld Inspections (Welds 1,4,5,7)...........
Fail Comment:
Weld 5 failed due to size/length and porosity. Weld 7 failed due to lack of fusion and porosity.
Long-Term Alignment Check w/New Shaft............
Pass Breaker ID......................
Sl-52-1126 Type..............................
DS-206 Short-Term Weld Inspections (Welds 2,3,6)............
Fail Comment:
Welds failed due to weld size and length of weld. Pole shaft replaced.
Long-Term Held Inspections (Welds 1,4,5,7)...........
Fail Comment:
Weld 1 failed due to lack of fusion.
Long-Term Alignment Check w/New Shaft............
Pass
-3 Breaker ID...
S-52-127 Type.............................DS-206 Short-Term Weld Inspections (Welds 2,3,6)............
Fail Comment:
Weld 2 failed due to weld size, length of weld, and lack of fusion. Pole shaft replaced.
Long-Term Held Inspections (Welds 1,4,5,7)..........
Not Performed Comment:
Weld inspections not performed due to unsatisfactory results of short-term inspections.
Long-Term Alignment Check w/New Shaft............
Pass Breaker ID....
... S1-52-1131 Type.......
DS-206 Short-Term Weld Inspections (Welds 2,3,6).......
Fail Comment:
Welds failed due to weld size and length of weld. Pole shaft replaced.
Long-Term Weld Inspections.
Pass Long-Term Alignment Check w/New Shaft...........
Pass Breaker ID (Spare)...........
........... Sl-52-1226 Type........
DS-206 Short-Term Weld Inspections (Welds 2,3,6)...
Fail Comment: Welds failed due to weld size and length of weld. Pole shaft to be replaced.
Long-Term Weld Inspections..........
Pass Long-Term Alignment Check w/New Shaft....
Later Report Breaker ID.
... Sl-52-1227 Type........
DS-206 Short-Term Weld Inspections (Welds 2,3,6).........
Fail Comment:
Weld 2 failed due to weld size, length of weld, and lack of fusion. Weld 6 failed due to weld size and length of weld.
Pole shaft replaced.
Long-Term Weld Inspections.
Pass Long-Term Alignment Check w/New Shaft............
Pass
-4 Breaker ID.
S-52-1230 Type..................................................
DS-206 Short-Term Weld Inspections (Welds 2,3,6).......
Fail Comment:
Welds failed due to weld size and length of weld. Pole shaft replaced.
Long-Term Held Inspections (Welds 1,4,5,7)...........
Fail Comment:
Weld 7 failed due to weld size and length of weld.
Long-Term Alignment Check w/New Shaft.........
Pass Breaker ID........................... Sl-521231 Type...
DS-206 Short-Term Weld Inspections (Welds 2,3,6)............
Fail Comment:
Welds failed due to weld size and length of weld. Pole shaft replaced.
Long-Term Weld Inspections (Welds 1,4,5,7)...........
Fail Comment: Welds 1 & 7 failed due to weld size and length of weld.
Long-Term Alignment Check w/New Shaft............
Pass Breaker ID........................... Sl-52-1229 Type....
................DS-416 Short-Term Weld Inspections (Welds 2,3,6)............
Fail Comment:
Weld 2 failed due to weld size and length of weld. Weld 6 failed due to porosity. Pole shaft replaced.
Long-Term Weld Inspections (Welds 1,4,5,7)..........
Not Performed Comment:
Weld inspections not performed due to unsatisfactory results of short term inspections.
Long-Term Alignment Check w/New Shaft..........
Pass
Breaker ID (Spare).
SO#27Y2656B1 Type..
DS-416 Short-Term Weld Inspections (Welds 2,3,6).
Fail Comment: Welds 2, 3, 6 failed due to weld size. Weld 2 had lack of fusion.
Pole shaft to be replaced.
Long-Term Weld Inspections (Welds 1,4,5,7).
Fail Comment:
Welds 1,4,5,7 failed due to weld size. Weld 7 also failed due to lack of fusion.
Long-Term Alignment Check w/New Shaft.......
Later Report Breaker ID (Spare).
............ SO#27Y2656B.
Type.
DS-416 Short-Term Weld Inspections (Welds 2,3,6)............
Fail Comment: Welds failed due to weld size and length of weld. Pole shaft to be replaced.
Long-Term Weld Inspections (Welds 1,4,5,7)..........
Not Performed Comment:
Weld inspections not performed due to unsatisfactory results of short-term weld inspection.
Long-Term Alignment Check w/New Shaft.......
Later Report NM/ACL:0103V