FIELD: atomic power engineering; water-to- water power reactors. SUBSTANCE: down passage of heated medium is made in form of recess located in diametric plane of steam generator which is parallel to U-shaped heat- exchange tubes feeding heated medium to central portion of tube sheet which is spherical in shape and is provided with circular passage at periphery; circular passage is connected with blow system. Recess may be provided with distributing member in lower portion located concentrically relative to surface of tube sheet. EFFECT: enhanced reliability due to washing-off and removal of sludge from surface of tube sheet. 2 cl, 4 dwg
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