They have a primary and a secondary containment structure, both made from thick reinforced concrete, to protect against the release of radioactive materials.
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Both these steps demonstrated an innate conservatism about the structure of secondary education.
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This rectangular secondary containment building is the structure that most people have seen in pictures of the reactor.
He said that regulatory weaknesses were a secondary issue although he used withering words to describe the poor structure and standards of regulation.
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