Part 21 Report - 1999-300

PART 21 REPORT - DEVIATION IN A NUCLEAR LOGISTICS INC (NLI) DC POWER SUPPLY.

A DEVIATION HAS BEEN IDENTIFIED IN A NLI DC POWER SUPPLY, P/N NLI-LGS-G-24-OV-R-8018 WHICH HAVE BEEN SUPPLIED AS A CLASS 1E COMPONENT, THAT ALLOWS A PREMATURE OVER VOLTAGE PROTECTION ACTUATION TO OCCUR IN A CIRCUIT SPECIFIC APPLICATION. THIS CONDITION OCCURRED DURING DIESEL GENERATOR STARTUP, SPECIFICALLY DURING DIESEL GENERATOR LOADING. THIS ISSUE WAS DETERMINED TO BE A DEVIATION ON 4/19/99, HOWEVER, TO DATE NLI HAS NOT BEEN ABLE TO DUPLICATE THIS CONDITION DURING LABORATORY TESTING. DATA COLLECTION AND ADDITIONAL TESTING IS BEING PERFORMED TO RESOLVE THE DEVIATION. IT THE PREMATURE OVER VOLTAGE PROTECTION ACTUATION IS DETERMINED TO BE THE RESULT OF THE POWER SUPPLY DESIGN, OTHER NLI-L SERIES POWER SUPPLIES WILL BE TESTED TO DETERMINE THEIR SUSCEPTIBILITY TO SIMILAR CONDITIONS. TESTING AND EVALUATION ACTIVITIES WILL BE COMPLETED ON 7/16/99. THESE COMPONENTS HAVE BEEN SUPPLIED AS SAFETY-RELATED COMPONENTS TO PUBLIC SERVICE ELECTRIC AND GAS COMPANY.