United States Nuclear Regulatory Commission - Protecting People and the Environment

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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