Gas cooled nuclear reactors

Claim 1

DEVICE FOR DETECTING LEAKS IN THE GAS-TIGHT JACKETS SURROUNDING SLUGS OF FISSILE MATERIAL GENERATING BY NEUTRON BOMBARDMENT THEREOF BETA-EMISSIVE FISSION PRODUCTS AND HEAT IN A HETEROGENEOUS NUCLEAR REACTOR, SAID HEAT BEING CARRIED AWAY BY AT LEAST ONE PLURALITY OF GAS FLOWS CIRCULATING THROUGH SAID REACTOR IN HEAT-EXCHANGE RELATIONSHIP WITH SAID SLUGS, COMPRISING, FOR SAID PLURALITY, A SERIES OF SEPARATE DUCT MEANS FOR PICKING UP A REPRESENTATIVE SAMPLE OF EACH GAS FLOW IN SAID PLURALITY, COMMON DUCT MEANS, SWITCHING MEANS FOR SUCCESSIVELY AND RECURRENTLY CONNECTING EACH OF SAID SEPARATE DUCT MEANS WITH SAID COMMON DUCT MEANS, THEREBY CYCLICALLY SENDING IN SAID COMMON DUCT MEANS REPRESENTATIVE SAMPLES OF EACH ONE OF SAID GAS FLOWS IN SAID PLURALITY, AN ENLARGED DETECTION CHAMBER, FILTER MEANS DISPOSED BETWEEN SAID COMMON DUCT MEANS AND SAID DETECTION CHAMBER, MEANS FOR CIRCULATING THROUGH SAID FILTER MEANS AND SAID DETECTION CHAMBER SAID REPRESENTATIVE SAMPLES FROM SAID COMMON DUCT MEANS, RADIATION DETECTOR MEANS FOR DETECTING THE RADIATION ACTIVITY IN SAID DETECTION CHAMBER, SAID RADIATION DETECTOR MEANS BEING SELECTIVELY SENSITIVE TO THE BETA RAYS EMITTED BY SAID FISSION PRODUCTS AND THEREFORE TO THE FISSION PRODUCTS CONTENT IN SAID COMMON DUCT MEANS, AND RECORDING MEANS FOR INSCRIBING THE SUCCESSIVE DETERMINATIONS OF SAID RADIATION DETECTOR MEANS, THEREBY RECORDING SEQUENTIALLY AND CYCLICALLY THE FISSION PRODUCTS CONTENT OF EACH OF SAID GAS FLOWS IN SAID PLURALITY.