United States Nuclear Regulatory Commission - Protecting People and the Environment

LICENSEE: FAIRBANKS MORSE ENGINE DIVISION
 
SITE: FAIRBANKS MORSE ENGINE DIVISION EN NUMBER: 35448
 
DOCKET: EVENT DATE: 03-08-99
 
RX TYPE: EVENT TIME: 14:20
 
VENDORS: NOTIFY DATE: 03-08-99
 
EMERGENCY CLASS: N/A REGION: 3 STATE: WI TIME: 15:29
 
OPS OFFICER: FANGIE JONES
 
10 CFR SECTION: CCCC UNSPECIFIED PARAGRAPH
  10 CFR PART 21 REPORT REGARDING IMPROPER HEAT TREATMENT TO CAM ROLLERS

On February 9, 1999, Coltec Industries, Fairbanks Morse Engine Division (FMED), became aware of a potential safety hazard associated with the air and exhaust valve cam rollers for FM-ALCO 251 engines. Final analysis was completed on March 8, 1999 by Engineering and Quality Assurance. They determined the cause to be improper heat treatment of the cam rollers, which results in premature wear of the roller and possible damage to the camshaft lobe, roller pin, and push rod. The suspect rollers were induction hardened, which resulted in inadequate case depth hardness and surface hardness.

FMED had supplied the suspect rollers to Consolidated Edison Indian Point 2 nuclear power station on November 14, 1997. Based on a review of FMED records, Consolidated Edison is the only nuclear utility that is impacted.

FMED has taken corrective action to prevent reoccurrence. In addition, the tolerance used during the dedication process for the cam rollers has been changed. Other tolerances will be reviewed as parts are dedicated.

It should be noted that FMED has not been notified, nor is it aware of any air and exhaust valve cam roller failures that have occurred at any nuclear facilities. The failures that have occurred have been in commercial applications after approximately 200 hours of operation.


Page Last Reviewed/Updated Thursday, March 29, 2012