Reactor pile unit for studying materials under radiation

Claim 1

IN A SWIMMING POOL REACTOR; MEANS INCLUDING A BOTTOM WALL FOR CONTAINING SAID POOL; AN OPENING IN SAID BOTTOM WALL AND A PLUG SEALING SAID OPENING; AN UPSTANDING PRESSURE RESISTANT TANK MOUNTED IN SAID POOL OVER SAID PLUG; A REACTOR CORE CONTAINING FUEL ELEMENTS IN SAID TANK; COOLANT INLET PIPES EXTENDING LATERALLY INTO THE UPPER PORTION OF SAID TANK AND HAVING DOWNWARDLY DIRECTED DEFLECTORS AT THEIR INNER ENDS, A COOLANT OUTLET PIPE EXTENDING INTO SAID TANK AT THE BOTTOM THEREOF FOR CIRCULATING COOLING WATER THROUGH SAID TANK SEPARATE FROMAND INDEPENDENTLY OF THE WATER IN THE POOL; SAID REACTOR CORE COMPRISING MEANS SUPPORTING FUEL ELEMENTS AND AT LEAST ONE GUIDING SHEATH BETWEEN CERTAIN OF SAID FUEL ELEMENTS, SAID GUIDING SHEATH EXTENDING DOWNWARDLY THROUGH SAID TANK AND SAID PLUG FOR GUIDING A CONTROL ROD TO AND THROUGH SAID CORE; SEALING MEANS BETWEEN AN UPPER PORTION OF SAID PLUG AND SAID BOTTOM WALL AND A SPACE BETWEEN SAID PLUG AND BOTANY CONTAMINATED WATER FROM SAID SPACE;AND RADIATION ABSORBENT SCREENS SURROUNDING SAID TANK OUTWARDLY OF SAID REACTOR CORE.