Protecting People and the EnvironmentUNITED STATES NUCLEAR REGULATORY COMMISSION
LICENSEE: SOUTH CAROLINA ELECTRIC & GAS CO.
SITE: SUMMER 1 EN NUMBER:30752
DOCKET: 05000395 EVENT DATE: 05-17-96
RX TYPE: PWR EVENT TIME: 00:00
VENDORS: W-3-LP NOTIFY DATE: 07-15-96
EMERGENCY CLASS: N/A REGION: 2 STATE: SC TIME: 16:15
OPS OFFICER: BOB STRANSKY
10 CFR SECTION: CDEF 21.21(b)(2) DEFECTS/NONCOMPLIANCE
UNIT SCRAM RX INIT INITIAL MODE CURR CURRENT MODE
CODE CRIT PWR PWR
1 N N 0 HOT SHUTDOWN 0 HOT SHUTDOWN
10 CFR PART 21 REPORT REGARDING FAILURES OF ABB/ITE 27N RELAYS.
THE FOLLOWING IS TEXT OF A FACSIMILE SUBMITTED BY THE LICENSEE:
"NONCONFORMANCE NOTICE 5472 REPORTS THE THIRD FAILURE OF ABB/ITE
27N RELAYS AT V.C. SUMMER NUCLEAR STATION WITHIN A THREE YEAR
PERIOD. IN EACH CASE, THE TIMER INTEGRATED CIRCUIT U5 WAS
DETERMINED TO BE DEFECTIVE. IN ALL CASES, V.C. SUMMER NUCLEAR
STATION ENSURED THAT THE ASSOCIATED APPLICATIONS WERE RESTORED TO
OPERABLE STATUS UPON IDENTIFICATION, REPLACEMENT AND TESTING OF
THE RESPECTIVE 27N RELAYS. ABB HAS NOT ESTABLISHED A ROOT CAUSE
FOR WHAT APPEARS TO BE A REPETITIVE FAILURE OF THE U5 TIMER. THIS
REPORT IS BEING MADE PURSUANT TO 10 CFR PART 21."
THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED BY THE LICENSEE.
