IMPROVED REACTOR INTERNALS HOLD DOWN SPRING

摘要

In a nuclear reactor pressure vessel including reactor internals with hold down spring structures and upper head region cooling passages, the hold down spring structures comprise a plurality of stacks of Belleville spring washers to provide spring load and deflection capability to hold down the reactor vessel internals. Each spring assembly includes means for passing an adjustable coolant flow to the upper reactor vessel head region in order to maintain that region at inlet coolant temperature. The spring assemblies are angularly spaced about a core barrel support flange to cooperate with coolant flow passages formed therein.