Morning Report for April 6, 1999
Headquarters Daily Report
APRIL 06, 1999
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REPORT NEGATIVE NO INPUT
ATTACHED INPUT RECEIVED RECEIVED
HEADQUARTERS X
REGION I X
REGION II X
REGION III X
REGION IV X
PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION III APRIL 6, 1999
Licensee/Facility: Notification:
Commonwealth Edison Co. MR Number: 3-99-0026
La Salle 1 Date: 03/25/99
Marseilles,Illinois RI via Telephone
Dockets: 50-373
BWR/GE-5
Subject: UNIT 1 FUEL ASSEMBLY LEAK
Discussion:
On March 25, 1999, the licensee identified an increase in the offgas
system pre- treat radiation release rate. Levels increased from
approximately 50 mrem per hour before the leak to approximately 80 to 90
mrem per hour after the leak was identified. Radiation levels
subsequently steadied out at approximately 70 mrem per hour. The
dose-equivalent iodine increased from approximately 8.08 x 10-5 to 1.39 x
10-2 microcuries per gram. The Technical Specification limit was 0.2
microcuries per gram. The licensee entered the failed fuel procedure,
which required increased offgas and reactor coolant system sampling to
monitor for further degradation. On April 2, 1999, the licensee commenced
a power reduction to perform flux suppression testing of the reactor core
in order to identify the location of the leaking fuel assembly. The
licensee successfully identified the location of the leaking assembly and
suppressed the flux around the bundle by fully inserting three adjacent
control rods.
Regional Action:
Resident Inspector follow-up.
Contact: M. N. Leach (630)829-9705
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