Patent
1978-12-04
1981-05-05
Lacey, David L.
176 38, 55 1, 55262, 55385A, 55DIG9, G21C 900, B01D 5700
Patent
active
042657075
ABSTRACT:
As a safety measure to reduce the content of fission and activation produ in the gas atmosphere contained within a nuclear reactor building after a so-called hypothetical malfunction, in a high-temperature gas-cooled reactor, the gas atmosphere within the reactor building is dusted with at least 0.5 kilogram, preferably more than 1 kg per 50 m.sup.3 of gas atmosphere volume, with particles having an average effective particle diameter in the range between 0.3 to 5 .mu.m, preferably of a material inert to oxygen, such as bentonite or clay, although graphite particles may be used if they are carried into the space with an inert gas carrier. The dusting is performed by a pneumatic system comprising a source of compressed gas, such as air or nitrogen, located outside the reactor building, and feed pipes feeding a pattern of dusting nozzles distributed over the ceiling of the interior space of the reactor building. The various feed pipes have dust hopper containers from the bottom of which the flow of gas draws off the dust to the dusting nozzles.
REFERENCES:
patent: 2795482 (1957-06-01), McNabney
patent: 3338665 (1967-08-01), Silverman
patent: 3764552 (1973-10-01), Godbee et al.
patent: 3871842 (1975-03-01), Queiser et al.
patent: 4067771 (1978-01-01), Rubin
Kernforschungsanlage Julich Gesellschaft mit beschrankter Haftun
Lacey David L.
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