Abstract
Precautions taken to ensure ‘clean’ conditions in the first civil nuclear power stations resulted in excessive costs and delays. These precautions are aimed at the elimination of materials which could poison the core, create a maintenance hazard, affect the fuel elements or increase the fire risk in the core.
The present paper reviews the subject in the light of the considerable experience of constructing and running reactors now available, and an attempt is made to assess the importance of the various precautions.
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