Part 21 Report - 2000-070
LICENSEE: STONE AND WEBSTER ENGINEERING CORPORATION
|SITE: NINE MILE POINT UNIT TWO ||EN NUMBER:36708|
|DOCKET: ||EVENT DATE: 12/17/1999|
|RX TYPE: ||EVENT TIME: 12:00[EST]|
|VENDORS: ||NOTIFY DATE: 02/18/2000|
|EMERGENCY CLASS: ||REGION: 1 STATE: NY TIME: 14:24[EST]|
HQ OPS OFFICER: DOUG WEAVER
10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH
Part 21 - Non-Conservatism in Environmental Qualification (EQ) Calculations
1-. Affected unit: Nine Mile Point Unit 2
2- Components that contain defect/deviation: Miscellaneous components (limitorque operators electrical cables etc.) in environmental qualification (EQ) program
3- Firm supplying components/activity: Stone and Webster Engineering Corporation (SWEC)
4- Nature of defect/deviation: non-conservatism in EQ calculations (lowest expected ambient temperatures used instead of normal expected ambient temperatures for winter periods). About 30 components will have qualified lives reduced from greater than 40 years to less than 40 years, when non-conservatism is removed. Several hundred other components will have qualified lives reduced but not to less than 40 years.
5- Date on which information was obtained (discovery date): December 17. 1999
6- Number and location of components: potentially numerous components in multiple systems at multiple locations.
7- Corrective actions: EQ calculations and Environmental Qualification Engineering Design Criteria document, which was source of erroneous data for the EQ calculations, will be corrected prior to expiration of actual qualified lives of affected EQ components i.e., within a few years.
Page Last Reviewed/Updated Saturday, February 01, 2020