Protecting People and the EnvironmentUNITED STATES NUCLEAR REGULATORY COMMISSION
LICENSEE: LASALLE COUNTY STATION
SITE: LASALLE COUNTY STATION EN NUMBER:31093
DOCKET: EVENT DATE: 09-28-96
RX TYPE: EVENT TIME: 12:00
VENDORS: NOTIFY DATE: 10-04-96
EMERGENCY CLASS: N/A REGION: 3 STATE: IL TIME: 15:35
OPS OFFICER: DOUG WEAVER
10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH
PART 21 NOTIFICATION ON WKM MODEL 70-13 PNEUMATIC ACTUATORS
ANCHOR DARLING VALVE COMPANY PERFORMED EFFECTIVE DIAPHRAGM AREA
(EDA) TESTING ON THE VARIOUS WKM MODEL 70-13 PNEUMATIC ACTUATORS
(SIZES 35, 70, 140, 280). THE PRELIMINARY TEST RESULTS INDICATED
THAT THE ORIGINAL EFFECTIVE DIAPHRAGM AREA VALUES USED TO
CALCULATE THE BENCH SET AND SUPPLY AIR SET POINTS WERE INCORRECT.
THESE ACTUATORS ARE USED ON VARIOUS PRIMARY CONTAINMENT
ISOLATION VALVES AND THESE VALVES MAY NOT PROVIDE ADEQUATE SYSTEM
ISOLATION UNDER DESIGN ACCIDENT CONDITIONS.
LASALLE UNIT ONE IS IN COLD SHUTDOWN AND UNIT TWO IS IN THE
REFUEL MODE.
* * * UPDATE RECEIVED BY FAX AT 1508 ON 11/27/96, TAKEN BY WEAVER
* * *
DESIGN CHANGES FOR ALL AFFECTED PRIMARY CONTAINMENT ISOLATION
SYSTEM (PCIS) AND REACTOR CORE ISOLATION SYSTEM (RCIC) VALVES
HAVE BEEN INITIATED TO MAKE THE REQUIRED SETTING ADJUSTMENTS TO
ENSURE ADEQUATE DESIGN MARGINS. BOTH UNITS WILL REMAIN IN A
CONDITION THAT DOESN'T REQUIRE VALVE DESIGN OPERATION UNTIL THE
PROBLEM IS CORRECTED.
THE LICENSEE SUBMITTED AN LER ON THIS TOPIC ON 10/28/96. AN
UPDATED LER WILL BE SUBMITTED ON 12/02/96. THE HOO NOTIFIED VERN
HODGE OF THIS UPDATE.
