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Information Notice No. 86-66: Potential for Failure of Replacement AC Coils Supplied by the Westinghouse Electric Corporation for use in Class 1E Motor Starters and Contactors
SSINS No.: 6835 IN 86-66 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 August 15, 1986 Information Notice No. 86-66: POTENTIAL FOR FAILURE OF REPLACEMENT AC COILS SUPPLIED BY THE WESTINGHOUSE ELECTRIC CORPORATION FOR USE IN CLASS 1E MOTOR STARTERS AND CONTACTORS Addressees: All nuclear power reactor facilities holding an operating license or a construction permit. Purpose: This notice is to alert licensees that certain Westinghouse Electric Corporation ac coils have shown a higher failure rate than previously experienced. These coils are similar to Class IE coils manufactured and supplied by Westinghouse as replacement parts for use in Class 1E motor starters and contactors. It is expected that the licensees will review this information for applicability to their facilities and consider actions, if appropriate, to preclude the use of the defective coils. However, suggestions contained in this information notice do not constitute NRC requirements; therefore, no specific action or written notice is required. Description of Circumstances: On June 19, 1986 Westinghouse Water Reactor Division (WRD) submitted a 10 CFR Part 21 report to the NRC indicating a higher-than-normal failure rate for ac coils. The report stated that most of the failures had been encountered during the initial hours of energization. These coils were manufactured at the Westinghouse Control Division (WCD) facility in Coamo, Puerto Rico, between June 1, 1984 and December 31, 1985 and are provided as replacement parts for use in motor starters and contactors. Discussion: During early June 1986, Westinghouse concluded that the Class 1E coils used in certain motor starters and contactors in nuclear plants could be subject to failure. This conclusion was based on information from various non-nuclear customers about failures of similar coils. However, it should be noted that up to this time no nuclear power plant Class 1E coil failures had been reported to WRD. 8608120034 . IN 86-66 August 15, 1986 Page 2 of 2 Discussions between Westinghouse divisions have determined that the non-Class 1E coils manufactured between June 1, 1984 and December 31, 1985 experienced a significant increase in failure rate compared to prior history. These reported coil failures occurred primarily less than 1 hour to several hours after the coils had been continuously energized. To correct the problem, WCD made a number of manufacturing changes that included revised materials and processes. Westinghouse tests performed on newly manufactured coils have indicated that the modified coils are not subject to the same failures as those coils manufactured during June 1, 1984 through December 31, 1985. Westinghouse states, "Any coil manufactured since the beginning of 1986 is free of the potential for such failures." WRD has determined that any coil which has been successfully energized continuously (not cumulative) for 5 days or more is expected to perform satisfactorily and need not be replaced. Attached is a list of the plants with potentially defective coils that have been notified by WRD, followed by the, WRD list of date codes of potentially defective coils. For facilities not on the list and using or stocking any WCD coils with one of the listed date codes, it is suggested that the Westinghouse Water Reactor Division be contacted for information on the need for corrective action. No specific action or written response is required by this information notice. If you have any questions about this matter, please contact the Regional Administrator of the appropriate NRC regional office or this office. Edward L. Jordan Director Division of Emergency Preparedness and Engineering Response Office of Inspection and Enforcement Technical Contact: L. B. Parker, IE (301) 492-7190 Attachments: 1. List of Facilities and Date Codes 2. List of Recently Issued IE Information Notices . Attachment 1 IN 86-66 August 15, 1986 Page 1 of 2 FACILITIES NOTIFIED BY WESTINGHOUSE 1. Maine Yankee 2. Oconee 3. Prairie Island 4. San Onofre 5. Three Mile Island 6. Turkey Point 7. Vermont Yankee DATE CODES OF POTENTIALLY DEFECTIVE COILS WEEK OF MANUFACTURE NUMBERS 1984 DATE CODES 1985 DATE CODES 01 CRSEC 02 CRWEC 03 CRIEC 04 CRTEC 05 CRCEC 06 CRHEC 07 CRGEC 08 CREEC 09 CRAEC 10 CSREC 11 CSSEC 12 CSWEC Approx 3-31 13 CSIEC 14 CSTEC 15 CSCEC 16 CSHEC 17 CSGEC 18 CSEEC 19 CSAEC 20 CWREC Approx 6-1 21 CWSET CWSEC 22 CWWET CWWEC 23 CWIET CWIEC 24 CWTET CWTEC 25 CWCET CWCEC Approx 7-1 26 CWHET CWHEC 27 CWGET CWGEC 28 CWEET CWEEC 29 CWAET CWAEC 30 CIRET CIREC 31 CISET CISEC 32 CIWET CIWEC 33 CIIET CIIEC . Attachment 1 IN 86-66 August 15, 1986 Page 2 of 2 WEEK OF MANUFACTURE NUMBERS 1984 DATE CODES 1985 DATE CODES 34 CITET CITEC 35 CICET CICEC 36 CIHET CIHEC 37 CIGET CIGEC 38 CIEET CIEEC Approx 9-30 39 CIAET CIAEC 40 CTRET CTREC 41 CTSET CTSEC 42 CTWET CIWEC 43 CTIET CTIEC 44 CTTET CTTEC 45 CTCET CTCEC 46 CTHET CTHEC 47 CTGET CTGEC 48 CTEET CTEEC 49 CTAET CTAEC 50 CCRET CCREC 51 CCSET CCSEC Approx 12-31 52 CCWET CCWEC NOTE: Any coil with one of these date codes should be treated as potentially defective and appropriate action taken.
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