United States Nuclear Regulatory Commission - Protecting People and the Environment

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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