Part 21 Report - 1996-740

LICENSEE: PUBLIC SERVICE ELECTRIC & GAS CO. SITE: SALEM 2 EN NUMBER:30850 DOCKET: 05000311 EVENT DATE: 08-07-96 RX TYPE: PWR EVENT TIME: 16:00 VENDORS: W-4-LP NOTIFY DATE: 08-08-96 EMERGENCY CLASS: N/A REGION: 1 STATE: NJ TIME: 16:17 OPS OFFICER: JOHN MacKINNON 10 CFR SECTION: CDEG 21.21(c)(3)(i) DEFECTS/NONCOMPLIANCE UNIT SCRAM RX INIT INITIAL MODE CURR CURRENT MODE CODE CRIT PWR PWR 2 N N 0 REFUELING 0 REFUELING TEN OF 222 REPLACEMENT SUMMATOR AND ISOLATOR MODULES FOR SALEM UNIT 2 (USED IN THE REACTOR CONTROL AND PROTECTION SYSTEMS) WERE FOUND TO HAVE UNSOLDERED ELECTRICAL CONNECTIONS DURING INSPECTION. NUS MODEL OCA801 SIGNAL ISOLATOR MODULES AND MODEL MTH801 SIGNAL SUMMATOR MODULES ARE BEING INSTALLED AS REPLACEMENT FOR MODULES IN THE REACTOR CONTROL AND PROTECTION SYSTEM TO PROVIDE IMPROVED RELIABILITY. DURING BENCH TESTING, AN ELECTRICAL CONNECTION WITH NO SOLDER WAS OBSERVED ON A REPLACEMENT SUMMATOR MODULE. ALL REPLACEMENT SUMMATOR AND ISOLATOR MODULES FOR SALEM UNIT 2 WERE THEN INSPECTED. TEN OF 222 MODULES WERE FOUND TO HAVE UNSOLDERED ELECTRICAL CONNECTIONS. ANOTHER SEVEN MODULES WERE FOUND TO HAVE INSUFFICIENT SOLDER ON AT LEAST ONE CONNECTION. SOME OF THE DEFECTIVE CONNECTIONS WERE COVERED BY HEAT SHRINK INSULATION. THE MODULES WERE MANUFACTURED BY NUS, P.O BOX 50736, IDAHO FALLS, ID., 83405. ALL REPLACEMENT MODULES FOR SALEM UNIT 2 HAVE BEEN INSPECTED BY THE VENDOR AND REPAIRED. ALL REPLACEMENT MODULES FOR SALEM UNIT 1 HAVE BEEN RETURNED TO THE VENDOR FOR INSPECTION AND REPAIR. PSE&G IS INVESTIGATING THE CAUSE OF THE DEFECT WITH THE VENDOR. RESULTS WILL BE PROVIDED WHEN THE INVESTIGATION IS COMPLETED. THE NRC RESIDENT INSPECTOR WAS INFORMED OF THIS PART 21 BY THE LICENSEE. PART 21 SENT TO VERN HODGE VIA FACSIMILE.

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