United States Nuclear Regulatory Commission - Protecting People and the Environment

ABB COMBUSTION ENGINEERING     29263 08-31-95 OTH
LICENSEE: ABB COMBUSTION ENGINEERING         
SITE: .ABB COMBUSTION ENGINEERING    .        EN NUMBER:29263
DOCKET:                                  EVENT DATE: 08-31-95
RX TYPE:                                 EVENT TIME: 00:00
VENDORS:                                NOTIFY DATE: 08-31-95
EMERGENCY CLASS: N/A  REGION: 1 STATE: CT      TIME: 10:47
OPS OFFICER: JOSEPH SEBROSKY          
10 CFR SECTION: CCCC  21.21               UNSPECIFIED PARAGRAPH

ABB COMBUSTION ENGINEERING (CE) OF WINDSOR, CONNECTICUT, REPORTED
A DEFECT IN A REACTOR PROTECTION SYSTEM (RPS) SUB-COMPONENT IN   
ACCORDANCE WITH 10 CFR PART 21.                                  
                                                                 
THE DEFECT WAS THE PRESENCE OF A HARD WIRED CONNECTION IN EACH OF
THE FOUR CONTAINMENT HIGH PRESSURE TRIP LOGIC CIRCUITS PROVIDED  
TO CONSUMERS POWER COMPANY FOR THE PALISADES NUCLEAR POWER
PLANT.
 THE DEFECT CAUSES THE RPS TO BE UNABLE TO TRIP THE REACTOR ON A 
VALID HIGH CONTAINMENT PRESSURE SIGNAL.  THE PROBLEM HAS BEEN    
CORRECTED AT PALISADES, AND CE HAS NO REASON TO BELIEVE THAT THIS
REPORTABLE CONDITION APPLIES TO ANY OTHER PLANT FOR WHICH CE     
DESIGNED THE NUCLEAR STEAM SUPPLY SYSTEM.                        
                                                                 

Page Last Reviewed/Updated Thursday, March 29, 2012