Part 21 Report - 1998-250
LICENSEE: ILLINOIS POWER CO.
SITE: CLINTON 1 EN NUMBER:33819
DOCKET: 05000461 EVENT DATE: 03-02-98
RX TYPE: BWR EVENT TIME: 14:25
VENDORS: GE-6 NOTIFY DATE: 03-02-98
EMERGENCY CLASS: N/A REGION: 3 STATE: IL TIME: 14:25
OPS OFFICER: JOHN MacKINNON
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
INCORRECT CALCULATION IN DIESEL GENERATOR CONTROL CIRCUITRY
RESULTS IN INSUFFICIENT VOLTAGE AND INOPERABILITY OF THE DIVISION
1 DIESEL GENERATOR.
A DISCREPANCY IN A DIRECT CURRENT VOLTAGE CALCULATION FOR THE
DIVISION 1 DIESEL GENERATOR CONTROL CIRCUITRY WAS DISCOVERED. THE
CALCULATION DID NOT INCLUDE THE EXISTENCE OF TWO CABLES THAT ARE
RUN TO THE REMOTE SHUTDOWN PANEL AND THEIR EFFECT ON THE VOLTAGE
DROP TO THE DIESEL GENERATOR CONTROL PANEL. PRELIMINARY
EVALUATION OF THE IMPACT OF THIS ERROR INDICATED THAT THERE HAS
NOT BEEN SUFFICIENT VOLTAGE TO THE CONTROL PANEL FOR ALL OF ITS
CONNECTED EQUIPMENT. THE CAUSE OF THIS EVENT IS AN ERRONEOUS
CALCULATION PROVIDED BY SARGENT AND LUNDY DESIGN ENGINEERS. THE
ENGINEER FAILED TO INCLUDE THE CABLE LENGTHS FROM AND TO THE
REMOTE SHUTDOWN PANEL IN THE VOLTAGE DROP CALCULATION FOR THE
DIESEL GENERATOR CONTROL PANEL. THIS ERROR WAS OVERLOOKED IN
SEVERAL SUBSEQUENT REVISIONS. THE CORRECTIVE ACTIONS FOR THIS
EVENT ARE TO RESTORE THE DIESEL GENERATOR CONTROL PANEL VOLTAGE
TO AN ACCEPTABLE LEVEL, TO REVIEW OTHER VOLTAGE CALCULATIONS TO
ENSURE NO OTHER CIRCUITS OMITTED CABLING, TO REVIEW THE CONTROL
CIRCUITS THAT PASS THROUGH THE REMOTE SHUTDOWN PANEL AND TO BRIEF
ENGINEERING PERSONNEL ON LESSONS LEARNED FROM THIS EVENT. LER
WAS SUBMITTED BY THE LICENSEE.
Page Last Reviewed/Updated Wednesday, March 24, 2021