FIELD: nuclear power engineering. SUBSTANCE: steam generator has horizontal casing accommodating primary-coolant tube bundle and secondary steam outlet arrangement assembled of steam discharge pipe connections installed along top part of casing and connected to at least one steam header; each steam discharge pipe connection accommodates at least one insert in the form of converging-diverging nozzle. Minimal sectional area of nozzle is found from formula given in description of invention. EFFECT: provision for preventing failure of reactor core in case of trouble in secondary steam line. 2 cl, 2 dwg
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