AECL provides update on NRU activities

    CHALK RIVER, ON, Aug. 5 /CNW/ - The following information bulletin is in
accordance with Atomic Energy of Canada Limited's (AECL) ongoing commitment to
voluntary public disclosure of events related to the Chalk River Laboratories.
    A detailed analysis of the Non Destructive Examination (NDE) data
collected to date continues. Results of this analysis have been provided to
the vendors to support their tooling development. The NDE team has undertaken
high-resolution scans of the vessel using the Mark I tool. The deployment of
the new Mark II tool is scheduled for mid August. It will allow us to complete
the investigation of areas that were otherwise not accessible.
    Work continues with specialized vendors on proving repair tooling designs
and fabrication of the equipment. Based on the results from the data collected
through NDE, AECL has selected "weld build-up" as the preferred repair
technique. This technique builds up the thickness of the metal by fusing weld
rod material to the surface. Mechanical repair may also be used if required
for specific conditions.
    Qualification testing of the repair tools will be required following
manufacture. Testing of the repair process and special tools will be carried
out on the full height mock-up assembled in the former NRX reactor. The
mock-up will be used to train employees on the specialized repair tools.
    Evidence collected to date continues to support AECL's belief that the
necessary vessel repairs can be made and that NRU will be returned to service.
    Guidance on the duration of the shutdown continues to be founded on the
best evidence available, including the most up-to-date analysis of the
inspection data, progress on repair strategies, and critical path requirements
for restart after an extended shutdown.
    AECL continues to work very closely with the Canadian Nuclear Safety
Commission (CNSC), and CNSC safety inspectors are directly involved at the
Chalk River site.
    There is no threat to workers, the public, the environment or nuclear
safety related to this event. More information on the repair and status
updates on the NRU is available at

For further information:

For further information: Dale Coffin, Director, Corporate
Communications, AECL, 1-866-886-(AECL) 2325

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