Part 21 Report - 1996-370

LICENSEE: MSD, INC SITE: STRUTHERS-DUNN EN NUMBER:30322 DOCKET: EVENT DATE: 04-19-96 RX TYPE: EVENT TIME: 00:00 VENDORS: NOTIFY DATE: 04-19-96 EMERGENCY CLASS: N/A REGION: 2 STATE: SC TIME: 12:03 OPS OFFICER: BOB STRANSKY 10 CFR SECTION: CDEF 21.21(b)(2) DEFECTS/NONCOMPLIANCE 10 CFR PART 21 REPORT - INCORRECT COILS INSTALLED IN TIME DELAY RELAYS THE FOLLOWING IS TEXT EXCERPTED FROM A FACSIMILE SUBMITTED BY THE VENDOR: "IT HAS COME TO OUR ATTENTION THAT A QUANTITY OF STRUTHERS-DUNN TYPE 236ABX135NE TIME DELAY RELAYS BUILT IN 1983 HAVE INCORRECT COILS IN THEM. SPECIFICALLY, THE AFFECTED RELAYS CONTAIN 39 GAUGE COILS; THEY SHOULD HAVE 43 GAUGE. AS A RESULT, THE COILS CONSUME SEVERAL TIMES THE REQUIRED POWER WHICH IS DISSIPATED AS HEAT, AND UPON PROLONGED ENERGIZATION MAY OVERHEAT TO THE POINT OF SELF-DESTRUCTION. WE HAVE ONE SUCH OCCURRENCE TO DATE. WE BELIEVE THE DEFECT WAS CAUSED BY PERSON OR PERSONS WHO RELIED ON MEMORY RATHER THAN DOCUMENTATION WHEN BUILDING THESE DEVICES. THEY WERE INTENDED FOR USE ON 125-VOLT DC CIRCUITS; THE COILS INSTALLED ARE THOSE NORMALLY USED ON 120-VOLT AC. SINCE THE RELAYS WOULD FUNCTION PROPERLY FOR BRIEF PERIODS, THE DEFECT WAS OBVIOUSLY OVERLOOKED. TO DATE, WE HAVE FOUND NINE RELAYS AS DESCRIBED, ALL AT GEORGIA POWER'S PLANT HATCH. ALL ARE DATE CODED 8335 WHICH INDICATES THEY WERE BUILT IN THE 35TH WEEK OF 1983. WE ARE OF THE OPINION THIS WAS THE ONLY TIME THIS OCCURRED, BUT THERE IS NO WAY TO PROVE IT ... FORTUNATELY, THESE RELAYS' COILS ARE CLEARLY MARKED, AND VERIFICATION OF CORRECT COIL GAUGE CAN BE ACCOMPLISHED WITH A VISUAL INSPECTION ... AGAIN, WE BELIEVE PLANT HATCH HAS THE ONLY ONES, BUT WE CANNOT BE CERTAIN." THE ASSETS OF STRUTHERS-DUNN WERE PURCHASED IN 1990 BY MSD, INC.

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