REACTOR PLANT Russian patent published in 1994 - IPC

FIELD: nuclear power engineering. SUBSTANCE: thermal shielding of reactor-plant circulating pump is provided by two coaxial shells: external shell 12 and internal one 13. Clearance between shells is filled with thin corrugated sheets 15 placed in a spaced relation. Thermal shielding is provided with siphon chamber in the form of circular I-shaped duct mounted in a spaced relation to inner surface of internal shell 13. Bottom part of chamber 18 is fixed to inner surface of external shell 12. Top part of chamber 18 is fixed to bushing 24 mounted in a minimum spaced relation to inner surface of external shell 12. Upper end of bushing 24 is closed with ring 26 in the form of angle piece fixed to external shell 12. Interior of siphon chamber 18 has pipe unions 28 and 29. Bottom pipe union 28 communicates with outlet pipe of pump via piping. Top pipe union 29 communicates with inlet of coolant cleaning system whose outlet is hydraulically joined with interior of top part of pump thermal shielding. EFFECT: improved reliability of thermal shielding. 2 dwg