ML13331B323
| ML13331B323 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/31/1991 |
| From: | Southern California Edison Co |
| To: | |
| Shared Package | |
| ML13331B322 | List: |
| References | |
| IEB-88-010, IEB-88-10, NUDOCS 9104230437 | |
| Download: ML13331B323 (6) | |
Text
NRC BULLETIN 88-10 OUTAGE REPORT FOR SAN ONOFRE NUCLEAR GENERATING STATION UNIT 1, CYCLE 11 MOLDED CASE CIRCUIT BREAKERS MARCH 1991 9104230437 910422 PER ADOCK 05000206 Q
PDFR
NRC BULLETIN 88-10 OUTAGE REPORT for SAN ONOFRE NUCLEAR GENERATING STATION UNIT 1, CYCLE 11 TABLE OF CONTENTS SECTION DESCRIPTION PAGE I.
SUBJECT 1
II.
SCOPE 1
III.
REVIEW OF PREVIOUS REPORT INFORMATION 1
IV.
COMPLETION OF REQUESTED ACTIONS 1
V.
SUPPLEMENT 1, POSITION 5 REPLACEMENTS 4
I.
SUBJECT NRC Bulletin 88-10, Molded Case Circuit Breakers (MCCBs)
Outage Report San Onofre Unit 1, Cycle 11 II. SCOPE This report is provided in accordance with Reporting Requirements specified in NRC Bulletin 88-10 as it pertains to actions taken by Southern California Edison (SCE) for the San Onofre Nuclear Generating Station (SONGS) during the Unit 1 Cycle 11 refueling outage.
This report complies with the submittal commitments stated in the original SCE response for addressing Item 1.c and Item 2 of the Reporting Requirements specified in NRC Bulletin 88-10.
This report completes the actions required by the NRC Bulletin for the Unit 1 Cycle 11 Outage as identified in Non-Conformance Report (NCR) SO1-P-7129.
This report also completes actions for MCCB replacements required due to NRC clarifications made to Position 5 of NRC Bulletin 88-10 based on Supplement 1 to the Bulletin as identified in NCR SO1-P-7432.
III. REVIEW OF PREVIOUS REPORT INFORMATION This report provides information as a result of testing or replacing MCCBs during the Unit 1 Cycle 11 Outage as committed to in the original SCE re sponse. This report does not change information or commitments stated in the initial SCE report or the follow-up report submitted on March 30, 1989, and September 6, 1989, respectively.
SCE has reviewed this outage report for compliance with the clarifications for NRC Bulletin 88-10 as provided in Supplement 1 to Bulletin 88-10 and deter mined that this report is consistent with both the original Bulletin and its Supplement.
IV. COMPLETION OF REQUESTED ACTIONS Listed in Table 1, below, are the installed MCCBs which were replaced or tested, which were subject to the reporting requirements of the Bulletin as identified in NCR SO1-P-7129. The maintenance orders (MOs) or construction work orders (CWOs) under which the MCCBs were originally installed are also identified.
1
TABLE 1 UNIT 1 INSTALLED MOLDED CASE CIRCUIT BREAKERS REC ID MO/CWO EQUIPMENT QTY MNFR MODEL TRACEABLE 288 85060813 S1-8-1134 1
WEST FB3030PL NO 296 86013409 S1-VTB-INVTR-3 1
GE TEB132100 NO 301-1 86040434 S1-152-1A403 1
ITE EH2BO3O NO 301-2*
86040434 S1-152-1A404 1
ITE EH2B03O NO 301-3 86040434 S1-152-1A405 1
ITE EH2B030 NO 311*
86061139 51-72-120 1
WEST FA2090 NO 314*
86061368 S1-42-1321 1
WEST HFB3125 NO 315*
86061417 51-42-1365 1
WEST FB3100PL NO 330 88072099 S1-ELE-Y15 1
WEST E2100 NO TOTAL 9
(*) - These MCCBs were replaced during the SONGS Unit 1 Cycle 10 Outage.
A. Breakers Replaced and Not Tested Of the nine (9) MCCBs listed in Table 1, six (6) were initially scheduled to be replaced rather than tested. The replacements were either traceable MCCBs supplied under 10CFR50 Appendix B, or MCCBs that were tested to SCE's Verifi cation Test Procedure, VTP-E-067. Provided in Table 2, below, is a tabulation of the record ID, Equipment ID, the maintenance work order under which each MCCB was replaced, type of MCCB replacement and the purchase order for which the replacement MCCB was obtained or the construction work order under which the MCCB was tested.
TABLE 2 UNIT 1 REPLACED MOLDED CASE CIRCUIT BREAKERS REC ID MO EQUIPMENT ID QTY REPLACEMENT TYPE PO/CWO REPLACED 288 89061713 S1-8-1134 1 TRACEABLE PO-6EO49001 296 89063069 S1-VTB-INVTR-3 1 VTP-E-067 TESTED CWO-89052662 301-2* 89081639 S1-152-1A404 1 VTP-E-067 TESTED CWO-89082727 314*
89051241 S1-42-1321 1 TRACEABLE PO-6D127901 315*
89051275 S1-42-1365 1 TRACEABLE PO-8NO85423 330 90032927 S1-ELE-Y15 1 TRACEABLE PO-8XO30018 TOTAL 6
(*) - These MCCBs were replaced during the SONGS Unit 1 Cycle 10 Outage.
2
B. Breakers Tested Three (3) installed MCCBs were tested in accordance with VTP-E-067. This procedure complies with Attachment 1 of NRC Bulletin 88-10 for implementing each of the seven (7)
MCCB testing requirements. Of the three (3) MCCBs, two were tested successfully and returned to service. The results of the testing for these MCCBs are listed in Table 3 below.
The MCCB which failed the test was replaced with an MCCB that was successfully tested in accordance with VTP-E-067.
Tabulated below for each MCCB are the Record ID, manufacturer and model number. The procurement chain for each MCCB listed below was provided in Appendix C of SCE's followup report for Bulletin 88-10 which was submitted to the NRC by letter dated September 6, 1989. A maintenance work order is identified for each MCCB installation and a construction work order is identified for each MCCB tested.
TABLE 3 TESTED MOLDED CASE CIRCUIT BREAKERS REC ID MO/CWO MNFR MODEL QTY ACTION 301-1 90062448 ITE EH2-BO30 1
PASSED TEST DURING 90062447 CYCLE 11 OUTAGE, REINSTALLED.
301-3 90062489 ITE EH2-BO30 1
PASSED TEST DURING 90062447 CYCLE 11 OUTAGE, REINSTALLED.
311*
89051276 WEST FA-2090 I
FAILED TEST,,
89053182 REPLACED WITH MCCB TESTED TO VTP-E-067 DURING CYCLE 10 OUTAGE UNDER CWO 89051519.
TOTAL 3
(*)
- These MCCBs were replaced during the SONGS Unit 1 Cycle 10 Outage.
3
MCCB record ID 311 (rated 100 amperes) was replaced during the Unit 1, Cycle 10 Outage with a 90 ampere rated MCCB that was tested to VTP-E-067. SCE Engi neering has evaluated the 90A MCCB installed in position S1-72-120 in accor dance with Proposed Facility Change (PFC) 1-89-014, and concluded that it is adequate to provide proper coordination and protection such that restoration to the original 100A configuration is not required.
The disposition of NCR S01-P-7129 requires that any installed MCCB removed from service is to be returned to the warehouse, the MCCB quarantined, a Warehouse NCR initiated, and a visual inspection performed and documented.
Contrary to these requirements, MCCB Record IDs 296, 311 and 315 were replaced but not returned to the warehouse and cannot be located. However, visual inspections were previously performed on these MCCBs, as documented on VIs #
750, 713, and 714 respectively.
V.
SUPPLEMENT 1. POSITION 5 REPLACEMENTS As part of routine maintenance activities in 1989, six (6) MCCBs that were not within the scope of NRC Bulletin 88-10 were replaced with MCCBs that were not traced to the circuit breaker manufacturer (CBM) but were tested to VTP-E-067.
At that time, SCE considered replacement with non-traceable tested breakers to be within the original guidelines of NRC Bulletin 88-10. Subsequently, these replacements were found not to be in accordance with Position 5, Supplement 1 of NRC Bulletin 88-10 and NCR SO1-P-7432 was initiated to replace the break ers.
The MCCBs that are the subject of NCR S01-P-7432 were replaced by traceable MCCBs during the Unit 1 Cycle 11 outage under the corresponding maintenance work orders (MO) shown in Table 4.
TABLE 4 UNIT 1 SUPPLEMENT 1. POSITION 5 REPLACEMENTS REC ID MO/CWO EQUIPMENT QTY MNFR MODEL REPLACED 258-1 89121005 SIS-YB3-CB-52 1
GE TJK626600WL 350-1 89120998 S1-8-1113V 1
WEST E1015 350-2 89121000 S1-8-1115V 1
WEST E1015 350-3 89121002 S1-8-1216V 1
WEST E1015 350-4 89121003 S1-8-1417V 1
WEST E1015 350-5 89121004 S1-8-1111V 1
WEST E1015 TOTAL 6
4