Part 21 Report - 1997-282
LICENSEE: COOPER ENERGY SERVICES
SITE: COOPER ENERGY SERVICES EN NUMBER:32416
DOCKET: EVENT DATE: 05-30-97
RX TYPE: EVENT TIME: 00:00
VENDORS: NOTIFY DATE: 05-30-97
EMERGENCY CLASS: N/A REGION: 1 STATE: PA TIME: 14:53
OPS OFFICER: CHAUNCEY GOULD
10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH
NINF INFORMATION ONLY
- PART 21 - POTENTIAL MANUFACTURING DEFECT IN COOPER-BESSEMER KSV
EDGs -
COOPER ENERGY SERVICES MADE A 10 CFR PART 21 NOTIFICATION FOR
THEIR COOPER-BESSEMER KSV EMERGENCY DIESEL GENERATORS DUE TO A
POTENTIAL MANUFACTURING DEFECT. THE POTENTIAL DEFECT CONCERNS THE
THICKNESS OF THE PISTON CROWN IN THE VALVE CUTOUT AREA THAT
PROVIDES CLEARANCE FOR THE INTAKE AND EXHAUST VALVES. THE
NOMINAL DESIGN THICKNESS OF THIS AREA IS 0.438, BUT A FAILED
PISTON HAD AN AREA THAT TAPERED DOWN TO A MINIMUM THICKNESS OF
0.040.
FINITE ELEMENT ANALYSIS PERFORMED SUBSEQUENT TO THE FAILURE HAS
INDICATED AN ACCEPTABLE MINIMUM THICKNESS IN THE VALVE CUTOUT
AREA OF 0.100. THE ANALYSIS ALSO INDICATED THAT A 0.040 THICK
PISTON SHOULD NOT FAIL IN NORMAL OPERATION, BUT THE FACTOR OF
SAFETY IS BELOW NORMALLY ACCEPTED VALUES. EXAMINATION OF PISTONS
IN COOPER ENERGY SERVICES STORES NOTED MANY IN THE 0.25 TO 0.31
RANGE AND ONE AS LOW AS 0.070. THE ROOT CAUSE OF THE DEFICIENT
CONDITION WAS AN INCORRECT FOUNDRY PATTERN.
THE FOLLOWING PLANTS ARE AFFECTED: PALO VERDE, BRAIDWOOD, BYRON,
ZION, WATERFORD, SOUTH TEXAS, COOPER, NINE MILE POINT UNIT 2, AND
SUSQUEHANNA.
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