Part 21 Report - 1997-530

LICENSEE: ILLINOIS POWER CO. SITE: CLINTON 1 EN NUMBER:32648 DOCKET: 05000461 EVENT DATE: 07-18-97 RX TYPE: BWR EVENT TIME: 12:00 VENDORS: GE-6 NOTIFY DATE: 07-18-97 EMERGENCY CLASS: N/A REGION: 3 STATE: IL TIME: 16:55 OPS OFFICER: DICK JOLLIFFE 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 -POSSIBLE 10CFR21 REPORTABLE CONDITION RE POTENTIAL DEGRADATION OF RPS UPS- GENERAL ELECTRIC SPECIFICATION #22A3153, REVISION 5, PARAGRAPH 4.3.5.6.3 REQUIRES THAT POWER BEING SUPPLIED BY REACTOR PROTECTION SYSTEM (RPS) UNINTERRUPTIBLE POWER SUPPLY (UPS) #103-1-189 BE DISCONNECTED IF AN ABNORMAL VOLTAGE OR FREQUENCY CONDITION EXISTS FOR A DURATION OF 4 SECONDS OR MORE. AN ENGINEERING INVESTIGATION CONDUCTED BY ELGAR CORPORATION, SAN DIEGO, CA, AT CLINTON'S REQUEST, DETERMINED THAT WHILE THE UNDER/OVER-FREQUENCY CIRCUIT CAN BE CALIBRATED TO MEET THE 4 SECOND DELAY THRESHOLD, THE UNDER/OVER-VOLTAGE DETECTION CIRCUIT CANNOT MEET THIS SPECIFICATION DUE TO THE R-C TIME CONSTANT OF THE OVER-VOLTAGE CIRCUIT INPUT FILTER COMPONENTS, WHICH BY THEMSELVES, EXCEED THE 4 SECOND THRESHOLD AT CLINTON. ELGAR CORPORATION RECOMMENDS THAT CLINTON EVALUATE THE TIMING DELAY REQUIREMENTS APPLICABLE TO THE REACTOR PROTECTION SYSTEM TO DETERMINE IF ACTUAL PERFORMANCE IS DEGRADED AND THAT CLINTON TAKE ACTION AS APPROPRIATE. ELGAR CORPORATION IS PREPARED TO ASSIST IN THIS EFFORT AT CLINTON'S REQUEST.

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