Design, construction, inspection and testing. Used for shielding and containing gas cooled nuclear reactors and are a form of civil engineering structure requiring particularly high integrity and ensured leak tightness.Cross References:BS 12BS 600BS 882BS 1370BS 1881BS 3059BS 3604BS 4447BS 4449 BS 4482BS 4483BS 4486BS 5328BS 5493BS 5500BS 5896BS 5996BS 8110:Part 1Nuclear Installations Act 1965Nuclear Installations Act 1969