ML20116N614

Part 21 & Deficiency Rept SSH-M-85/01 Re Defective Circuit Breakers for Recombiners Supplied by Rockwell Intl.Initially Reported on 841124.Equipment Deficiencies Corrected Prior to Installation.Rockwell Intl Requested to Follow Up Action

ML20116N614
Person / Time
Site:	Monticello
Issue date:	05/03/1985
From:	Musolf D NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-85, REF-PT21-85-195-000 PT21-85-195, PT21-85-195-000, SSH-M-85-01, SSH-M-85-1, NUDOCS 8505070286
Download: ML20116N614 (3)

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Northern States Power Company 414 Nicollet Mall Minneaooks. Minnesota 55401 Telephone (612) 330-5500 May 3, 1985 Director Office of Inspection and Enforcement U S Nuclear Regulatory Commission Washington, DC 20555 MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Report of Defective Components (SSH-M-85/01)

The following infomation is reported in accordance with 10 CFR Part 21, Section 21.21 (b)(3) . Northern States, Power Company has determined that components intended for the Monticello Combustible Gas Control System (CGCS) were manufactured with potential defects which may have presented a substantial safety hazard.

The defective components were supplied by the manufacturer of recombiners used in the CGCS. The defects were detected during tt . ting of the components prior to their installation during the 1984 refueling and maintenance outage.

The components were repaired prior to plant startup.

The following information is provided related to this defect:

1. Name and Address of Individual or Individuals Informing the Commission David Musolf, Manager-Nuclear Support Services Northern States Power Company 414 Nicollet Mall Minneapolis,.MN 55401

2. Identification of the Facility and Defective Components Monticello Nuclear Generating Plant Rockwell International BWR Containment Recombiners Power Cabinet Circuit Breakers (two) 224A ITE Gould Molded Case Circuit Breakers

3. Identification of the Firm Supplying the Defective Components Rockwell International, Energy Systems Group

[S 0{0M $$$ 3. 'b

Director-I&E,..USNRC-MayJ3, 1985 Page'2-f4. Nature of Defect The two circuit breakers had.an internal open connection on one of the phases due_to a missing screw which connects the trip device to the disconnect mechanism.

.The defects were internal to the circuit breaker.and were detected by the NSP. Electrical Construction Testing Group as part of their pre-installation testing.

5. Date on Which ! Information Was Obtained

! The' Electrical Construction Testing Group filed a discrepancy report describing the defect on November 24, 1984.

.A Quality' Assurance Nonconformance Report was issued on December 4, 1984 and. Technical Review' Board action was initiated on the following day.

A preliminary investigation report was issued on February,11, l 1985 and submitted'to.the plant staffffor review. ~

The requirements for reportability of this failure were discussed at length and it was unclear whether.or not a Part 21 report was appropriate. The decision was made, however, to interpret the NRC requirements conservatively

, and submit a report. NSP management was notified of this

[ -determination on May 2, 1985.

6., Number of Components and Location

, See item (2) above. A total of four circuit breakers were~ '

supplied under the-same purchase order (M13282).

' 7. Corrective Action Taken The equipment deficiencies' vere corrected prior.to installation.

8.~ Advice Related'to Defect Given to Purchasers or Licensees

~

1

-Corrective action report M-34 was issued,to Rockwell International-on January. 10, 1985 requesting Rockwell to' identify the cause of

the defects, address -the. possibility of occurrence in

other circuit breakers of similar type, 'and identify l actions to be taken

-to prevent future' delivery 1of. defective circuit breakers.

s Advice given_to.other purchasers or licensees by Rockwell is 1- unknown.

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. Director-I&E,.USNRC, Northem States Power Company

.l May . 3 ; '1985 .'

-Page.3-Please contact'us;if you require additional information related to this report. . Three copies of:this report are being provided.

bbe,

-David'Musolf

' Manager-Nuclear Support Se ces

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.c:  : Administrator, Region III,.NRC NRC Resident Inspector

- G Charnoff.

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