Water cooled nuclear reactors

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Patent

CA 1312969

- 1 - ABSTRACT WATER COOLED NUCLEAR REACTORS In order to reduce any loss of primary water coolant from around a reactor core (16) of a water cooled nuclear reactor (10) caused by any failure of a pressure vessel (12), an inner vessel (14) is positioned within and spaced from the pressure vessel (12). The reactor core (16) and main portion of the primary water coolant circuit (22, 21, 24) and a heat exchanger (26) are positioned within the inner vessel (14) to maintain some primary water coolant around the reactor core (16) and to allow residual decay heat to be removed from the reactor core (16) by the heat exchanger (26). In a second embodiment (Figure 2) an aperture (15) at the upper region of the inner vessel (14) is dimensioned configured and arranged to prevent steam from a steam space (42) of an integral pressurised water cooled nuclear reactor (10B) for a ship entering the main portion of the primary water coolant circuit in the inner vessel (14) if the longitudinal axis (100) of the nuclear reactor (10B) is displaced from its normal substantially vertical position to anabnormal position at an angle to the vertical direction.

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