FIELD: taking liquid samples from reactor containment at nuclear power stations. SUBSTANCE: gas cushion 15 is formed within gas cushion space in sampling flask by means of pressure pulse 28. Gas cushion 15 is used for conveying part of liquid 6 contained in sampling flask 8 from containment of reactor 2. Liquid sampled in this way is used for measuring reactivity and other characteristics beyond reactor containment. EFFECT: enhanced safety of measurement procedure. 16 cl, 7 dwg
