How can one ensure that double containment of reactor building is sufficient for safety when nuclear explosion is known to be one of the most violent one?
In the Indian PHWR, even following an accident, the radioactive material released, is contained in the containment building. The building is a leak tight barrier around the reactor and is designed to control the escape of radioactivity to the environment under the accident condition. This building uses the feature of double containment principle. Thus even if there is some release of radioactivity past the inner containment building, this is trapped in the annular space (kept under negative pressure) between the inner and outer containment. The atmosphere in the annular space can be cleaned through special filters which can trap radioactive material. This provision ensures that ground level release of radioactivity from the containment even under several accident conditions is virtually negligible. We are one of the few countries who have adopted the use of double containment principle for all indigenously designed PHWRs. The containments is designed for aircraft crashes also.
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