NRU Status Report No. 18

    AECL provides update on NRU activities

    CHALK RIVER, ON, Aug. 26 /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
    Non-Destructive Examination (NDE) inspections of the NRU reactor using
the Mark II tool are now complete and a large quantity of data has been
obtained for analysis. The Mark II tool inspected those areas of the reactor
vessel that were previously inaccessible. AECL's NDE team has begun the third
stage of examinations beginning with training on a special tool for vertical
inspection. NDE activities remain on schedule.
    Work continues with vendors on proving repair tooling designs and
fabrication of the equipment. Qualification testing of the repair tools will
be required following manufacture.
    Testing of the repair processes and tools continue using the full height
NRU mock-up in the former NRX facility at Chalk River Laboratories.
    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. At this time, the application of the
band weld build-up technique, and the number of identified repair sites,
indicates the NRU will return to service during Q1 2010. Further guidance on a
return to service date will be provided when more information becomes
    Evidence collected to date continues to support AECL's view that the
necessary vessel repairs can be made and that NRU will be returned to service.
    AECL continues to work closely with the Canadian Nuclear Safety
Commission (CNSC), and CNSC safety inspectors are directly involved at the
Chalk River site. AECL will appear before the Canadian Nuclear Safety
Commission on August 27 to provide an update on the NRU repair and return to
service status.
    There is no threat to workers, the public, the environment or nuclear
safety related to this event.

    More information on the return to service of NRU is available at, including two new video status updates by AECL's President & CEO
Hugh MacDiarmid and NRU Return to Service Project Director, David Cox. The
videos provide insight on AECL's return to service critical path and footage
of the NRU mock-up facility.

For further information:

For further information: Dale Coffin, Director, Corporate
Communications, Atomic Energy of Canada Limited, 1-866-886-2325

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