Emergency water injection mechanism for a nuclear reactor primary loop

A water injection mechanism for the emergency cooling of a reactor core is disclosed in which the passage of cooling water during an emergency and cooling of the core are assured despite rupture of any point of the loop. Flow meters are provided at the main steam pipe, recirculating pump check valve and the down pressure tube of the reactor core and automatically operable water injection valves are installed at the upper and lower headers. Should a rupture develop in the loop, a transducer upon receipt of a rupture signal generated by a sudden increase or reversal in the flow meter values automatically cause the appropriate water injection valves to open and direct a stream of water toward the reactor core. (Owens, K.J.)