ML20063Q242

NRC Bulletin 88-010 Outage Rept for San Onofre Generating Station Unit 3,Cycle 5,Molded-Case Circuit Breakers

ML20063Q242
Person / Time
Site:	San Onofre
Issue date:	08/31/1990
From:	SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML13302B342	List: ML13302B341 ML20063Q242
References
IEB-88-010, IEB-88-10, NUDOCS 9008240076
Download: ML20063Q242 (7)

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NRC BULLETIN 88-10 OUTAGE REPORT l for l

SAN ON0FRE h0 CLEAR GENERATING STATION UNIT 3, CYCLE 5 l MOLDED CASE CIRCUIT BREAKERS August 1990 k

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NRC BULLETIN 88-10 OUTAGE REPORT for -

SAN ONOFRE NUCLEAR GENERATING STATION -

UNIT 3, CYCLE 5 I l

TABLE OF CONTENTS l

SECTION DESCRIPTION PAGE

1. SUBJECT ................... 1 l

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11. SCOPE ..................... I 111. REVIEW OF PREVIOUS REPORT INFORMATION ..... 1 IV. COMPLETION OF REQUESTED ACTIONS ........ 2 V. TEST RESULTS OF INSTALLED MCCBs ........ 3 VI. ADDITIONAL MCCB TESTED ............ 4 t

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B I. Subject l 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. I NRC Bulletin 88 10 as it pertains to actions taken by Southern California i Edison (SCE) for the San Onofre Nuclear Generating Station (SONGS) during the  :

Unit 3 Cycle 5 Outage, i 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 re) ort also contains the testing results for an additional MCCB.

Althoug1 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 y 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 commit (nents 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 supplenent.

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4 NRC Bulletin 88-10 '

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 1 i

-(M0s)lled insta are also identified.or construction work orders (CW0s) under which the MCCBs w UNIT 3 INSTALLED MOLDED CASE CIRCUIT BREAKERS RECORD ID M0/CWO EOUIPMENT ID QIl ttB MQQIt TRACED 280 (6 85012661 3Q039-26 1 SQ D 0081 NO 283 (8 85040210 0Q033-30 SP 1 SQ D 00B1 NO 294 85121814 3QO20 03 SP 1 SQ D 00B1 N0 312 86061241 3D106, 3D206 2 GE THJK NO 329 88051364 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 arocured in accordance with item 7 of the NRC Bulletin.

Specifically, t1ese MCCBs were supplied under 10CFR50 Appendix B from Square D l

in Peru, Indiana. Provided below is a tabulation of the Record ID, Equipment 10, 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 1Q M0 EQUIPMENT ID QIl ACTION P0 280 (6 90012788 30039 26 1 Replaced 6A069002 283 (8 90032775 0Q033-30 SP 1 Replaced 6A079039 l 294(17 90012791 3Q020 03 SP 1 Replaced 6A069002 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 n -

i NRC Bulletin 68-10 -3 l Outage Report Unit 3, Cycle 5 above actions could be implemented. As stated in our NRC Eulletin 88-10 follow-up Report dated September 6,1989, MCCB Record 10 280 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 i 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 i difficult to refurbish without visible indications. It is doubtful, I therefore, that the MCCB would have been declared suspect had the planned l visual inspection and evaluation been performed. I B. Breakers Tested The remaining three MCCBs were tested in accordance with Verification Test Procedure VTP-E067. This )rocedure complies with Attachment 1 of NRC Bulletin 88-10 for implementing eac1 of the seven MCCB testing requirements. Of the three MCCBs, two were tested successfull;. and returned to service 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 re) laced with an MCCB which complies with ,

the criteria specified in Item 5 of tie NRC Bulletin for acceptable  !

replacements. The replacement MCCB (10 269-1 as identified in Appendix 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 VIP-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 Ap)endix C of SCE's followup resort for Bulletin 88-10 which was submitted to tie NRC by letter dated Septem)er 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 f Outage Report '

Unit 3, Cycle 5 i l

UNIT 3 TESTED MOLDED CASE CIRCULI BREAKERS RLCORD ID M0/CWO M ML DIl 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 Ap>endix -

B of SCE's March 30, 1989 report) was also tested and replaced during tie Unit 3 Cycle 5 Outage. Though initially addressed for action, this MCCB was later determined ia sccordance with NRC Bulletin 8810, Supplement 1, Position 3 to be not sube to these reporting requirements because it was received and installed pi ..r to August 1,1983. This MCCB is identified as follows:

RECORD ID M0/CWO EQUIPMENT ID QIf M MQQ[L 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 Tri) Test. In accordance with this test, the MCCB should have tripped within one lour. The MCCB did not trip at either the high or low setting.

Because of this test failure, MCCB 318 was re) laced with a MCCB which complies i with the criteria specified in Item 7 of the au116 tin. Since the tested MCCB l 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 mir.utes.

NRC Bulletin 88-10 5- i 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 M0/CWO lEEB  !!QQLL DIY ACTION 318(40) 90012793 ITE EF2A 1 Test Failed 90031308 SQ 0 FHL2 1 Installed as a '

Replacement r

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