Patent Number: 040452840
Section: claims

1. A nuclear reactor fuel containment safety structure for fuel of an atomic reactor in a primary containment and capable of heating to melt down temperatures if not properly cooled, and having means normally provided for cooling of the fuel comprising a fuel reactor shield having a fuel containment chamber adapted to contain the atomic reactor and reactor fuel therein, said fuel chamber having an exhaust passage means in the bottom thereof adapted to allow passage of a radioactive molten mass therethrough from said fuel chamber; a deactivating containment base attached to and extending generally downwardly from said fuel reactor shield at said exhaust passage means of said chamber for receiving any radioactive fuel flow from said chamber, whereby a molten radioactive mass formed by said reactor in said fuel reactor shield will pass into said deactivating containment base to be deactivated; said deactivating base has remotely located diffusing means for receiving a radioactive means flowing thereinto from said fuel chamber through said exhaust passage to diffusibly separate said fuel into remotely located parts to reduce the temperature of the mass, whereby a molten radioactive mass formed by said reactor in said fuel reactor shield will pass into said deactivating containment base to be dispersed to cool said mass; said deactivating base has flux material infusing means and poison control substance adapted to receive the dispersed flowing radioactive masses whereby said masses will be further cooled as a result of the fluxing action and the action of the poison control substance infused into the mass by the fluxing material; said flux material is positioned in said dispersing means for receiving the flowing radioactive mass to be infused therein for further cooling said mass, said diffusing means comprises a dispersion manifold chamber below said passage means for receiving fuel flow thereinto said chamber having a fuel receiving dome with the surface thereof centered below said passage means and being larger at its base than at the top thereof whereby fuel flowing thereonto, will flow downwardly thereover and therearound to diffuse said fuel around the base of said receiving dome; said diffusion means comprises multiple spaced apart passages extending radially outwardly and downwardly from said dispersion manifold chamber at the base of said dome for receiving fuel flow from said dome to further diffuse said fuel into said passages to further cool said fuel; wherein fluxing means is positioned in said dispersion passages for receiving said fuel and to infuse therewith to cool said fuel; and said fluxing means includes soluble melt plugs in said passages to temporarily stop flow of said fuel as said plugs are dissolved or melted causing a temporary backup of fuel to balance the fuel load in each diffusion passage.