| 摘要 |
System for regulating pressure in a container (1) which is the seat of dissolution reactions, leading to pressure peaks, followed by recombination reactions of the gases during which the pressure decreases. A first valve (21) is arranged on a first circuit for injection of gas into the enclosure and a second valve (22) is arranged on a second exhausted gas circuit. The first valve (21) is controlled to rapidly vary the injected gas flow rate within a range of operation away from the extreme opening and closing values. When it is required to leave the range of operation, a feedback system modifies the opening of the second valve (22), whose time constant is greater and which can allow a larger flow rate to pass. Application to dissolvers of nuclear fuels in nitric acid. <IMAGE>
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