G - Physics
21
C
359/40
G21C 15/18 (2006.01) G21C 9/012 (2006.01)
Patent
CA 1152656
ABSTRACT Boiling reactor comprising a reactor core and a pressure vessel enclosing said reactor core and being provided with at least one conduit for discharged steam and at least one conduit for feed water and during normal ope- ration being filled with water up to a certain normal level, the steam pressure in the pressure vessel having a substantially constant value of at least 5 MPa. The pres- sure vessel is surrounded by a water-filled pool with a water volume above the reactor core which is considerably greater than the water volume within the pressure vessel. The pressure vessel is a concrete vessel having an inter- nal thermal insulation. The reactor comprises emergency cooling pipes with valves connecting the reactor vessel to the pool. The valves are normally closed. The pipes are positioned at different levels. The emergency cooling valves are adpated to be controlled in dependence on the water level in the reactor vessel in such a way that they are opened when the water level is below a certain minimum level. When the valves are opened, steam is flowing out of the reactor vessel through the upper emergency cooling pipe, whereas water is flowing from the pool into the reactor vessel through the lower emergency cooling pipes as soon as the difference in static pressure in the pool between lower emergency cooling pipe and upper emergency cooling pipe is greater than the pressure drop of the steam flux passing through the latter. Emergency cooling is achieved entirely without the use of pumps.
366921
Ab Asea-Atom
Robic Robic & Associes/associates
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