Part 21 Report - 1998-070

LICENSEE: ILLINOIS POWER CO. SITE: CLINTON 1 EN NUMBER:33556 DOCKET: 05000461 EVENT DATE: 01-16-98 RX TYPE: BWR EVENT TIME: 00:00 VENDORS: GE-6 NOTIFY DATE: 01-16-98 EMERGENCY CLASS: N/A REGION: 3 STATE: IL TIME: 15:47 OPS OFFICER: BOB STRANSKY 10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH UNIT SCRAM RX INIT INITIAL MODE CURR CURRENT MODE CODE CRIT PWR PWR 1 N N 0 COLD SHUTDOWN 0 COLD SHUTDOWN 10 CFR PART 21 REPORT REGARDING USE OF INCORRECT CABLE RESISTANCE IN DESIGN CALCULATIONS INCORRECT CABLE RESISTANCE VALUES WERE USED TO DETERMINE CABLE TRAY LOADING AND VOLTAGE DROP OF CABLES RATED FOR LESS THAN 5 kV. SARGENT & LUNDY STANDARD ESA-102 DID NOT CORRECTLY REFLECT RESISTANCE VALUES FOR TIN-COATED COPPER CONDUCTOR CABLES USED AT CLINTON. (TIN-COATED CABLES HAVE A HIGHER RESISTANCE THAN UNCOATED COPPER CABLES.) THE LICENSEE HAS IDENTIFIED THAT INCORRECT RESISTANCE VALUES WERE USED IN AT LEAST FIVE ELECTRICAL VOLTAGE CALCULATIONS FOR THE AC AND DC ELECTRICAL DISTRIBUTION SYSTEMS.

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