Process for treating waste gas in reprocessing of used nuclear fuel
US4482479A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1973 |
| Grant date | Nov 13, 1984 |
| Priority date | — |
| Expiry date | Dec 26, 1993 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21F9/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A waste gas generated in the reprocessing of used nuclear fuel is at first subjected to removal of explosive, gaseous substances such as hydrocarbons and nitrogen oxides, and materials capable of forming the explosive gaseous substances, such as oxygen, and condensible substances such as carbon dioxide, water and ammonia from the waste gas, and then to cryogenic distillation, thereby separating and recovering Kr-85 from the waste gas. As the separation and recovery of Kr-85 is carried out by cryogenic separation after the removal of the substances having a possibility to explode in a cryogenic distillation apparatus and also the removal of condensible substances having a possibility to clog a piping system of the apparatus, the operation of the apparatus is ensured. It is also disclosed that the oxygen and nitrogen oxides can be completely removed by catalytic hydrogen reduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.