Part 21 Report - 1997-590

LICENSEE: ILLINOIS POWER CO. SITE: CLINTON 1 EN NUMBER:32840 DOCKET: 05000461 EVENT DATE: 05-07-97 RX TYPE: BWR EVENT TIME: 00:00 VENDORS: GE-6 NOTIFY DATE: 08-29-97 EMERGENCY CLASS: N/A REGION: 3 STATE: IL TIME: 08:14 OPS OFFICER: CHAUNCEY GOULD 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 - 10CFR PART 21 REPORT - THE LICENSEE IS REPORTING A 10CFR PART 21 CONDITION INVOLVING A COMPONENT FOR WESTINGHOUSE MODEL 50DHP350, 4160-VOLT CIRCUIT BREAKERS. THE COMPONENT IS THE ARC CHUTE, MANUFACTURER PART #567F417G02. THE ARC CHUTE APPEARS TO BE DIFFERENT IN CONFIGURATION FROM THE ORIGINAL ARC CHUTE AND EXHIBITED AN INADEQUATE CLEARANCE BETWEEN THE REAR ARC HORN AND THE ARC CHUTE MOLDED CASE DURING INSTALLATION. THE MAJOR DIFFERENCES APPEAR TO BE THE POSITION AND ANGLE OF BEND FOR CONTACT. DUE TO THE INADEQUATE CLEARANCE WHICH OCCURS DURING INSTALLATION, EXCESSIVE FORCE WOULD BE REQUIRED ON THE LINE POLE UNIT TO ALLOW THE ARC CHUTE TO ATTACH TO THE FRONT ARC CHUTE SUPPORT. THE LICENSEE HAS 5 OF THE POTENTIALLY AFFECTED ARC CHUTES ON HAND. THE LICENSEE IS NOT AWARE OF OTHER FACILITIES THAT COULD BE AFFECTED BY THIS DEFICIENCY.

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