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.
Page Last Reviewed/Updated Wednesday, March 24, 2021