United States Nuclear Regulatory Commission - Protecting People and the Environment


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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