Part 21 Report - 1998-210

LICENSEE: PACIFIC GAS & ELECTRIC CO. SITE: DIABLO CANYON 2 EN NUMBER:33676 DOCKET: 05000323 EVENT DATE: 02-06-98 RX TYPE: PWR EVENT TIME: 12:00 VENDORS: W-4-LP NOTIFY DATE: 02-06-98 EMERGENCY CLASS: N/A REGION: 4 STATE: CA TIME: 20:09 OPS OFFICER: DOUG WEAVER 10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH UNIT SCRAM RX INIT INITIAL MODE CURR CURRENT MODE CODE CRIT PWR PWR 2 N Y 100 POWER OPERATION 100 POWER OPERATION PART 21 REPORT - PIPING SPOOL PIECE DID NOT MEET CLEANLINESS REQUIREMENTS. ON 12/17/97, PG&E DETERMINED THAT A PIPING SPOOL SCHEDULED FOR INSTALLATION INTO UNIT 2 DURING THE UPCOMING REFUELING OUTAGE WAS NONCONFORMING. THE SPOOL IS PG&E CLASS A, 1.5 INCH NOMINAL PIPE SIZE, SCHEDULE 160, STAINLESS STEEL AND IS APPROXIMATELY 59 INCHES LONG. THE SPOOL WAS ACCEPTED BY PG&E FROM CONSOLIDATED POWER SUPPLY COMPAANY AFTER UNDERGOING A BENDING PROCESS TO CONFORM TO THE EXISTING PIPING CONFIGURATION. THE SPOOL IS CONSIDERED A BASIC COMPONENT AND WAS SCHEDULED TO BE INSTALLED IN THE SAFETY INJECTION SYSTEM COLD LEG INJECTION LINE (LOOP A) BETWEEN AN UPSTREAM THROTTLE VALVE AND DOWNSTREAM TRIMMING ORIFICE. THE CONDITION APPLIES ONLY TO THE SUBJECT PIPING SPOOL. PG&E HAS DETERMINED THE SPOOL WAS PROCESSED IN DEVIATION OF ASME SECTION II, SA-376 PARAGRAPH 11.8 REQUIREMENTS FOR CLEANLINESS WHICH STATES, IN PART, THAT THE PIPE SHALL BE FREE OF SCALE AND CONTAMINATING IRON PARTICLES... DEPARTURE FROM THIS REQUIREMENT PREVENTS PROPER PASSIVATION AND CORROSION RESISTANCE. A MATERIAL AND SAFETY EVALUATION CONCLUDED THAT THE PIPE COULD DEVELOP A LEAK THAT COULD ADVERSELY AFFECT THE SAFETY INJECTION SYSTEM FLOW BALANCE DURING A LOSS OF COOLANT ACCIDENT. THEREFORE THE DEVIATION REPRESENTS A SUBSTANTIAL SAFETY HAZARD AND A REPORTABLE DEFECT. PG&E INTENDS TO FILE A FINAL REPORT IN 30 DAYS. PG&E HAS INFORMED CONSOLIDATED POWER SUPPLY COMPANY OF THIS REPORTABLE DEFECT AND WILL SEND THE COMPANY A COPY OF THIS NOTIFICATION AND FINAL REPORT. THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR.

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