ML13302B341

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Responds to NRC Bulletin 88-010 Re Nonconforming molded-case Circuit Breakers (Mccbs).Affected MCCBs Purchased for Use in safety-related Applications,Including MCCBs Used W/Motor Controllers.Outage Rept Encl,Per
ML13302B341
Person / Time
Site: San Onofre Southern California Edison icon.png
Issue date: 08/21/1990
From: Rosenblum R
SOUTHERN CALIFORNIA EDISON CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML13302B342 List:
References
IEB-88-010, IEB-88-10, NUDOCS 9008240075
Download: ML13302B341 (10)


Text

ACCELERATED DI 4BUTION DEMONSTVUION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9008240075 DOC.DATE: 90/08/21 NOTARIZED: YES DOCKET #

FACIL:50-361 San Onofre Nuclear Station, Unit 2, Southern Californ 05000361 AUTH.NAME AUTHOR AFFILIATION ROSENBLUM,R.M.

Southern California Edison Co.

RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

R

SUBJECT:

Responds to NRC Bulletin 88-010 re nonconforming molded-case I

circuit breakers.

DISTRIBUTION CODE: IE21D COPIES RECEIVED:LTR ENCL SIZE:

D TITLE: Bulletin Response 88 Nonconforming Molded Cse Circuit Breakers. S NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL A

PD5 LA 1

0 PD5 PD 1

1 KOKAJKO,L.

1 1

D INTERNAL: AEOD/DOA 1

1 AEOD/DSP/TPAB 1

1 D

NRR DOEA/GCB 11 1

1 NRR GILL,A.S.

1 1

NRR STONE,J.C.

1 1

NRR/DET/EMEB9H3 1

1 S

NRR/DOEA/OEAB11 1

1 NRR/DOEA/OGCB11 1

1 NRR/DREP/PEPB9D 1

1 NRR/DST 8E2 1

1 ILRB12 1

1 NRR/POTAPOVS,U 1

1 02 1

1 RES/DSIR/EIB 1

1 5

FILE 01 1

1 EXTERNAL: LPDR 1

1 NRC PDR 1

1 NSIC 1

1 R

I D

S A

D D

NOTE TO ALL "RIDS" RECIPIENTS:

S PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED:

LTTR 21 ENCL 20

Southern California Edison Company 23 PARKER STREET IRVINE, CALIFORNIA 92718 August 21, 1990 R. M.ROSENBLUM TELEPHONE MANAGER OF (714)587-5420 NUCLEAR REGULATORY AFFAIRS U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

Docket Nos. 50-361 Response to NRC Bulletin 88-10, "Non-conforming Molded Case Circuit Breakers" San Onofre Nuclear Generating Station Unit 3

Reference:

F. R. Nandy (SCE) to Document Control Desk (NRC) letter dated January 4, 1990. Same subject, Unit 2 This letter provides Southern California Edison's (SCE's) response to the Molded Case Circuit Breaker (MCCB) testing requirements of NRC Bulletin 88-10 for San Onofre Unit 3. NRC Bulletin 88-10 requested Licensees to perform a variety of verification and testing activities to provide reasonable assurance that certain MCCBs will perform their safety function. The affected MCCBs are those which were purchased for use in safety-related applications, including MCCBs used with motor controllers, and do not have verifiable traceability to the circuit breaker manufacturer. The NRC's concern was that these MCCBs might have been refurbished without the Licensee's knowledge and may not meet all the manufacturer's specifications.

SCE provided our initial response to NRC Bulletin 88-10 by letter dated March 30, 1989. That letter responded to reporting requirements 1 and 3 of the NRC bulletin and also stated that SCE would submit a report that summarizes the results of MCCB tests conducted in accordance with Action Requests 3 and 5 of Bulletin 88-10 within 30 days after startup from the Unit 1 cycle 11, Unit 2 cycle 5 and Unit 3 cycle 5 refueling outages. The Unit 2 cycle 5 refueling outage ended on December 8, 1989, and the Unit 2 report was submitted to the NRC by the referenced letter. The Unit 3 cycle 5 refueling outage ended on July 21, 1990.

The enclosure to this letter, "NRC Bulletin 88-10 Outage Report, Unit.3 Cycle 5," provides the results of testing or replacing MCCB's as committed in SCE's March 30, 1989 response.

I.J I..

Z1

Document Control Desk August 21, 1990 This report does not alter information stated in the initial report or the followup report submitted on September 6, 1989. SCE has also reviewed the enclosed report against the additional clarifications provided in NRC Bulletin 88710, Supplement 1. This review confirmed that the enclosed report adheres to the clarified NRC guidance for MCCB traceability and testing activities.

SCE will submit the MCCB testing report for Unit 1 in accordance with the schedule restated above. Following submittal of the Unit 1 report, SCE will have satisfied all of the reporting requirements of NRC Bulletin 88-10.

If you have any questions or comments, please contact me.

Very truly yours, By:

H R. M. Rosenblum Manager of Nuclear Regulatory Affairs Subs ribed and sworn to before me this NOTARY PUBUIC STATE OFCAUIFORNIA County of Orange

-HOLLY D.ROSET Not ar My pImmet Ep-89 of California cc:

J. B. Martin, Regional Administrator, NRC Region V C. Caldwell, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3

NRC BULLETIN 88-10 OUTAGE REPORT for SAN ONOFRE NUCLEAR GENERATING STATION UNIT 3, CYCLE 5 MOLDED CASE CIRCUIT BREAKERS August 1990

NRC BULLETIN 88-10 OUTAGE REPORT for SAN ONOFRE NUCLEAR GENERATING STATION UNIT 3, CYCLE 5 TABLE OF CONTENTS SECTION DESCRIPTION PAGE I.

SUBJECT.

1 II.

SCOPE.

1 III.

REVIEW OF PREVIOUS REPORT INFORMATION.....1 IV.

COMPLETION OF REQUESTED ACTIONS....

2 V.

TEST RESULTS OF INSTALLED MCCBs...

3 VI.

ADDITIONAL MCCB TESTED......

4

I.

Subject NRC Bulletin 88-10, Molded Case Circuit Breakers (MCCBs)

Outage Report San Onofre Unit 3 Cycle 5 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 3 Cycle 5 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 also contains the testing results for an additional MCCB.

Although previously identified for corrective action, MCCB record ID 318 has been determined in accordance with NRC Bulletin 88-10, Supplement 1, Position 3 to be not subject to these reporting requirements because it was received and installed prior to August 1, 1983. It was tested, however, and is addressed in Section VI.

This report completes the actions required by the NRC Bulletin for the Unit 3 Cycle 5 Outage as identified in Non-Conformance Report (NCR) 3-2364.

III.

Review of Previous Report Information This report provides information as a result of testing or replacing MCCBs during the Unit 3 Cycle 5 outage as committed to in the original SCE response.

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 determined that this report is consistent with both the original bulletin and its supplement.

NRC Bulletin 88-10

-2 Outage Report Unit 3, Cycle 5 IV. Completion of Requested Actions Listed below are the installed MCCBs which are subject to the reporting requirements of the bulletin for this outage report. The maintenance orders (MOs) or construction work orders (CWOs) under which the MCCBs were originally installed are also identified.

UNIT 3 INSTALLED MOLDED CASE CIRCUIT BREAKERS RECORD ID MQ/CWO EQUIPMENT ID OTY MNFR MODEL TRACED 280 (6) 85012661 3Q039-26 1

SQ D QOB1 NO 283 (8) 85040210 0Q033-30 SP 1

SQ D QOB1 NO 294 (17) 85121814 3Q020-03 SP 1

SQ D QOB NO 312 (35) 86061241 3D106, 3D206 2

GE THJK NO 329 (49) 88061364 3D306 SP 1

GE THJK NO Total 6

Note:

SP denotes that the MCCB is an installed spare.

( ) represents ID numbers used in initial report.

A. Breakers Replaced and not Tested Of the six MCCBs listed, three were initially scheduled to be replaced rather.

than tested. These three MCCBs were replaced during the Unit 3 Cycle 5 Outage with new MCCBs procured in accordance with Item 7 of the NRC Bulletin.

Specifically, these MCCBs were supplied under 10CFR50 Appendix B from Square D in Peru, Indiana. Provided below is a tabulation of the Record ID, Equipment ID, the maintenance work order under which each MCCB was replaced and the purchase order for which the replacement MCCB was obtained.

UNIT 3 REPLACED MOLDED CASE CIRCUIT BREAKERS RECORD ID MO EQUIPMENT ID OTY ACTION PO 280 (6) 90012788 3Q039 26 1

Replaced 6A069002 283 (8) 90032775 0Q033-30 SP 1

Replaced 6AO79039 294 (17) 90012791 3Q020 03 SP 1

Replaced 6AO69002 The disposition of NCR 3-2364 requires that any installed MCCB removed from service is to be returned to the warehouse, a Warehouse NCR initiated and a visual inspection performed and documented. Contrary to this requirement, MCCB Record ID 280 was disassembled and scrapped by M090012788 before the

NRC Bulletin 88-10

-3 Outage Report Unit 3, Cycle 5 above actions could be implemented. As stated in our NRC Bulletin 88-10 Follow-up Report dated September 6, 1989, MCCB Record ID 280 was purchased in 1985 from Orange Coast Electrical Company and could not be directly traced to a circuit breaker manufacturer. This supplier is not on the NRC list of suppliers of refurbished MCCB's. A previous limited inspection of this MCCB in its' installed configuration showed no indication of refurbishment. The MCCB appeared new with no signs of tampering. This breaker is a single pole design with rivetted casing and, because of this design, would have been very difficult to refurbish without visible indications. It is doubtful, therefore, that the MCCB would have been declared suspect had the planned visual inspection and evaluation been performed.

B. Breakers Tested The remaining three MCCBs were tested in accordance with Verification Test Procedure VTP-E067. This procedure complies with Attachment 1 of NRC Bulletin 88-10 for implementing each of the seven MCCB testing requirements. Of the three MCCBs, two were tested successfully and returned toservice during the Unit 3 Cycle 5 Outage. The results of the testing for these MCCBs are discussed in Section V below.

The MCCB which' failed the test was replaced with an MCCB which complies with the criteria specified in Item 5 of the NRC Bulletin for acceptable replacements. The replacement MCCB (ID 269-1 as identified inAppendix A of SCE's September 6, 1989 Report) was obtained from quarantined (nontraceable) stock but was successfully tested in accordance with SCE's Verification Test Procedure VTP-E067.

(Reference SCE CWO 89122220).

V. Test Results for Installed MCCBs This section provides the test results for three MCCBs tested during the Unit 3 Cycle 5 Outage which are subject to the reporting requirements of NRC Bulletin 88-10. 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.

NRC Bulletin 88-10

-4 Outage Report Unit 3, Cycle 5 UNIT 3 TESTED MOLDED CASE CIRCUIT BREAKERS RECORD ID MO/CWO MNFR MDL QTY ACTION

.312 (35) 90012798 GE THJK 1

Test Failed' 90031580 Replaced by 269-1 90012799 GE THJK 1

Successfully Tested 90031579 Returned to Service 329 (49) 90012795 GE THJK 1

Successfully Tested 90031581 Returned to Service VI. Additional MCCB Tested The MCCB identified in this report as Record ID 318 (Record ID 40 in Appendix B of SCE's March 30, 1989 report) was also tested and replaced during the Unit 3 Cycle 5 Outage. Though initially addressed for action, this MCCB was later determined in accordance with NRC Bulletin 88-10, Supplement 1, Position 3 to be not subject to these reporting requirements because it was received and installed prior to August 1, 1983. This MCCB is identified as follows:

RECORD ID MO/CWO EQUIPMENT ID OTY MNFR MODEL TRACED 318 (40) 86090374 3HV4706 1

ITE EF2A NO Corrective actions for MCCB 318 were also evaluated under station NCR 3-2364.

Because this MCCB was already evaluated under the requirements of Bulletin 88 10, we decided to include MCCB 318 in this report.

MCCB 318 was tested in accordance with Verification Test Procedure VTP-E067.

The MCCB failed Step 3.7, 135% Rated Trip Test. In accordance with this test, the MCCB should have tripped within one hour. The MCCB did not trip at either the high or low setting.

Because of this test failure, MCCB 318 was replaced with a MCCB which complies with the criteria specified in Item 7 of the bulletin. Since the tested MCCB model is now obsolete, a substitute MCCB was obtained under Appendix B from

'The MCCB failed Step 6.5 of VTP-E067, 100% Rated Hold-In Test. The test required a hold in time of two hours. The MCCB tripped in 72 minutes.

NRC Bulletin 88-10

-5 Outage Report Unit 3, Cycle 5 Square D in Peru, Indiana (Reference SCE PO 6A040009). The replacement MCCB was evaluated under Substitution Equivalency Evaluation (SEE) 90-0023. The construction work order which tested MCCB 318 and the maintenance work order which installed the new MCCB are identified below.

RECORD ID MO/CWO MNFR MODEL OTY ACTION 318 (40) 90012793 ITE EF2A 1

Test Failed 90031308 SQ D FHL2 1

Installed as a Replacement