Boiling water reactor - with condensation chamber separate outside safety shell and joined by gas-tight tube surrounded pipe

A boiling water reactor includes a reactor pressure vessel which is enclosed in a safety shell and is joined through a blow-off pipe with a condensn. chamber contg. water for the pptn. of steam. This condensn. chamber is situated outside the safety shell. The blow-off pipe is surrounded in the section between safety shell and condensn. chamber with a gastight tube. This provides satisfactory safety, yet reduces the capital cost, compared with a design where the safety shell is large enough to enclose the condensn. chamber.