The Environment Agency’s Nuclear Waste Assessment\ud Team (NWAT) commissioned Quintessa to review\ud Nirex/NDA's work relating to gas evolution and migration\ud in the context of disposing of higher activity radioactive\ud waste in a deep geological repository.\ud Significant quantities of gas (mainly hydrogen, carbon\ud dioxide and methane) will be generated in a deep\ud geological repository. Some of this gas is likely to be\ud radioactive. If gas accumulates in a repository there will\ud be a build up of pressure which has the potential to\ud disturb the engineered structure of the repository and its\ud host rock. If gas is not contained there will be other\ud consequences, particularly on the local ground water\ud flow regime
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