Features to Facilitate Forceful Break-up

The Ideas comprising this group of suggestions Imply building In to the assumed activated zone features which will assist the use of explosive, mechanical devices or chemical agents to cause disintegration of the concrete. These Ideas, together with comments on them are summarised below. 

The use of explosives for the controlled demolition of concrete biological shields and pressure vessels is being Investigated by TWO under Project 3 of the CEC programme on nuclear plant decommissioning This work indicates that the use of 

One such agent, suitable for unreinforced concrete, is BRISTAR produced by the Onada Cement Company Ltd., of Tokyo, Japan. This product has been successfully used for breaking up rock and massive unreinforced concrete structures. Additional information on its use is given in Appendix A. 

Provide preformed cavities for the insertion of mechanical bursters. 

Hydraulic bursters can be used effectively for breaking up concrete foundations and it is a reasonable assumption that they would also be effective for breaking up concrete on the inner face of a PCRV provided that a free face had first been established. Further information is given in Appendix A. 

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