Part 21 Report - 1998-480
ACCESSION #: 9803190268
LICENSEE EVENT REPORT (LER)
FACILITY NAME: LaSalle County Station, Unit 1 PAGE: 1 OF 4
DOCKET NUMBER: 05000373
TITLE: Abnormal Startup of Idle Reactor Recirculation Loop
Analysis (UFSAR Ch. 15) Not Bounding Due To Vendor
Inadequate Calculation
EVENT DATE: 02/10/98 LER #: 98-003-00 REPORT DATE: 03/12/98
OTHER FACILITIES INVOLVED: LaSalle County DOCKET NO: 05000374
Station, Unit 2
OPERATING MODE: 4/N POWER LEVEL: 000
THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR
SECTION:
OTHER (Voluntary Report)
LICENSEE CONTACT FOR THIS LER:
NAME: Dave Henry, System Engineering TELEPHONE: (815) 357-6761
Extension 2250
COMPONENT FAILURE DESCRIPTION:
CAUSE: SYSTEM: COMPONENT: MANUFACTURER:
REPORTABLE NPRDS:
SUPPLEMENTAL REPORT EXPECTED: NO
ABSTRACT:
On February 10, 1998, while analyzing a potential setpoint change,
General Electric (GE) discovered that the LaSalle UFSAR Chapter 15
analysis for "Abnormal Startup of an Idle Reactor Recirculation Pump" is
not bounding. Preliminary results from a GE analysis for a revised Flow
Control Valve (FCV) position for recirculation pump upshift indicated
that the current transient initial conditions are not the most severe.
In addition, using LaSalle's current approved setpoint of 15 percent FCV
position and the most limiting initial conditions, the thermal limits
acceptance criteria are not met. The plant was never in a condition to
challenge plant safety. LaSalle has never violated the procedural and
Technical Specification (3/4.4.1.4.b) requirements that govern idle
recirculation loop startup, thus maintaining thermal limits and fuel
cladding integrity. Previous GE analyses were insufficient, since the GE
analysis of this UFSAR transient did not properly identify the bounding
conditions. Events leading to this cannot be identified by ComEd, and
are being investigated by GE through the 10 CFR Part 21 process.
Bounding parameters and conditions will be established prior to restart
of either unit. These results, when obtained, will be incorporated into
the UFSAR and applicable procedures. There are no previous occurrences
of this event. The event is being reported voluntarily.
END OF ABSTRACT
TEXT PAGE 2 OF 4
PLANT AND SYSTEM IDENTIFICATION
General Electric - Boiling Water Reactor 3323 Megawatts Thermal
Rated Core Power
Energy Industry Identification System (EIIS) codes are identified in
the text as [XX].
A. CONDITION PRIOR TO EVENT
Unit(s): 1/2 Event Date: 02/10/98 Event Time: 15:45
Hours
Reactor Mode(s): 4/N Power Level(s): RCS [AB] Temperature:
000/000 Unit 1
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