Nuclear News: Canada Reactor design puts safety of nuclear plants into question
Today's big stories from the nuclear industry:
Globe and Mail: Canada Reactor design puts safety of nuclear plants into question
’Canadian nuclear safety regulators say they have underestimated the seriousness of a design feature at the country's electricity-producing reactors that would cause them to experience dangerous power pulses during a major accident. If reactors are not shut down quickly, their ability to keep radioactivity from escaping would be put to the test, according to an internal commission document. The document says Canada's seven nuclear stations, which all use Candu technology, have a feature known as "positive reactivity feedback," in which their atomic chain reactions automatically speed up if the water pumped into the reactors to cool them leaks, one of the worst accidents possible at a nuclear station. If reactors aren't immediately shut down during this type of incident, positive reactivity leads to a quick snowballing in the pace of nuclear reactions, which in turn could cause potentially damaging overheating. The document was obtained by the anti-nuclear environmental group Greenpeace through a federal Access to Information Act request. Positive reactivity is "the Achilles heel of Candu," said spokesman Shawn-Patrick Stensil, who contended it amounts to a design flaw that puts the safety of the reactors into question.’
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