FIELD: nuclear power engineering. SUBSTANCE: spiral tunnel is driven around vertical pipes and filter pit and is continued in the form of connection tunnel below connection. Means to catch and neutralize ejection are manufactured in the form of vertical cylindrical antiejection chamber with concrete lining and built in vertical ventilation holes. Chambers are mapped by closed isolated internal and external barrage contours. Spiral tunnel, connection and connection tunnel are built in doubled internal and external barrage contours. Internal contours are antifiltration ones against leakage of radioactive substances from inside outwards, external contours are hydraulic insulation ones against migration of underground water from outside into workings of channels. EFFECT: increased safety of underground antiejection channel. 4 cl, 3 dwg
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