Emergency core cooling spray head

Claim 1

A NUCLEAR REACTOR COMPRISING: A. A SUBSTANTIALLY CLOSED UPSTANDING VESSEL, B. A PAIR OF VERTICALLY SPACED TUBE SHEETS DIVIDING THE INTERIOR OF SAID VESSEL INTO AXIALLY SPACED SECTIONS INCLUDING A CORE REGION, AN OUTLET PLENUM AND AN INACTIVE PLENUM, C. A REACTIVE CORE IN SAID CORE REGION INCLUDING A PLURALITY OF FUEL ASSEMBLIES EACH CONTAINING UPPER AND LOWER END FITTINGS, ELONGATED HOLLOW GUIDE TUBES ATTACHING SAID END FITTINGS IN AXIALLY SPACED RELATION AND PARALLEL FUEL ELEMENTS EXTENDING BETWEEN SAID END FITTINGS, D. MEANS FOR CIRCULATING COOLANT FLUID THROUGH SAID CORE DURING PERIODS OF NORMAL REACTOR OPERATION, AND E. MEANS FOR SUPPLYING EMERGENCY COOLANT FLUID TO SAID CORE IN THE EVENT OF A PLANT ACCIDENT, SAID MEANS INCLUDING; I. A SOURCE OF EMERGENCY COOLANT FLUID DISPOSED EXTERNALLY OF SAID VESSEL, II. DUCT MEANS CONNECTING SAID SOURCE WITH SAID INACTIVE PLENUM, III. A PLURALITY OF TUBULAR CONNECTORS EXTENDING THROUGH SAID OUTLET PLENUM WITH THEIR UPPER AND LOWER ENDS ATTACHING SAID TUBE SHEETS AND COMMUNICATING WITH SAID INACTIVE PLENUM AND SAID CORE REGION RESPECTIVELY, IV. PLATE MEANS INTEGRAL WITH EACH OF SAID FUEL ASSEMBLIES FORMING ENCLOSED PLENUMS EACH HAVING A TRANSVERSE EXTENT AT LEAST AS GREAT AS THAT OF THE PERIPHERY OF THE ASSOCIATED FUEL ELEMENT BUNDLE, V. SAID HOLLOW GUIDE TUBES PENETRATING SAID PLENUMS AND HAVING THEIR UPPER ENDS COMMUNICATING WITH SAID TUBULAR CONNECTORS, VI. MEANS FORMING OPENINGS IN SAID GUIDE TUBES FOR CONNECTING SAID PLENUMS IN FLUID COMMUNICATION WITH TUBULAR CONNECTORS, AND VII. MEANS FORMING OPENING IN SAID PLATE MEANS FOR THE DISCHARGE OF EMERGENCY COOLANT FLUID FROM SAID PLENUMS.