Nbsp   What are the details of the accident at Chalk River's NRX reactor in 1952?

A. CANDU Technology B. The Industry C.

Cost/Benefit D. Safety/Liability E. Waste F.

Security/Non-Proliferation G. Uranium H. Research Reactors I.

Other R&D J. Further Info On December 12, 1952 a combination of mechanical failure and human error led to a now-famous power excursion and fuel failure in the NRX reactor at AECL Chalk River Laboratories. At the time NRX was one of the most significant research reactors in the world (rated at that time for 30 MW operation), in its sixth year of operation.

During preparations for a reactor-physics experiment at low power, a defect in the NRX shut-off rod mechanism combined with a number of operator errors to cause a temporary loss of control over reactor power. Power surged ultimately to somewhere between 60 and 90 MW over a period of about a minute (the total energy surge is estimated to be approximately 4000 MW-seconds). This energy load would normally not have been a problem, but several experimental fuel rods that ... more.

A. CANDU Technology B. The Industry C.

Cost/Benefit D. Safety/Liability E. Waste F.

Security/Non-Proliferation G. Uranium H. Research Reactors I.

Other R&D J. Further Info On May 24, 1958 a major fuel-handling accident occurred at the NRU research reactor facility at AECL Chalk River Laboratories. The NRU, one of the world's most powerful and versatile research reactors, was in its first year of operation (reactor design power: 200 MW).

Although a major event in its own right, the 1958 NRU accident was not as significant as the 1952 NRX accident (see related FAQ) in terms of either the resulting damage to the reactor core or its legacy to the field of reactor safety. Unlike the events of December 1952, the 1958 NRU accident did not involve a power excursion in an operating reactor. It occurred while NRU was shut down and undergoing an operation to remove failed fuel from its core.

While being removed the failed fuel rod did not receive adequate cooling and ... more.

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