Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Emergency core coolant systems
Patent
1980-12-15
1982-12-14
Behrend, Harvey E.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Emergency core coolant systems
376283, 376370, G21C 1518
Patent
active
043637809
ABSTRACT:
Boiling reactor comprising a reactor core (1) and a pressure vessel (2) 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 operation being filled with water up to a certain normal level (11), the steam pressure in the pressure vessel having a substantially constant value of at least 5 MPa. The pressure vessel (2) is surrounded by a water-filled pool (3) with a water volume above the reactor core (1) which is considerably greater than the water volume within the pressure vessel (2). The pressure vessel (2) is a concrete vessel having an internal thermal insulation (9). The reactor comprises emergency cooling pipes (19, 20) with valves (19', 20') connecting the reactor vessel (2) to the pool (3). The valves (19', 20') are normally closed. The pipes (19, 20) are positioned at different levels. The emergency cooling valves (19', 20') are adapted to be controlled in dependence on the water level (11) in the reactor vessel (2) in such a way that they are opened when the water level is below a certain minimum level. When the valves (19', 20') are opened, steam is flowing out of the reactor vessel (2) through the upper emergency cooling pipe (19), whereas water is flowing from the pool (3) into the reactor vessel (2) through the lower emergency cooling pipes (20) as soon as the difference in static pressure in the pool between lower emergency cooling pipe (20) and upper emergency cooling pipe (19) is greater than the pressure drop of the steam flux passing through the latter. Emergency cooling is achieved entirely without the use of pumps. (FIG. 1.)
REFERENCES:
patent: 3115450 (1963-12-01), Schanz
patent: 3454466 (1969-07-01), Pitt et al.
AB Asea-Atom
Behrend Harvey E.
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