Alternate discharge method of two units in the containment filter discharge system

Abstract

The invention belongs to a reactor designing technology, and particularly relates to a two-unit alternative-discharging method of a containment vessel filtering discharging system. The two-unit alternative-discharging method comprises the steps of after an accident occurs, firstly, switching on a containment vessel isolating valve of a first unit so as to carry out filtering discharging on the first unit; when the pressure of a second unit is high, closing a discharging pipeline of the first unit, switching on an isolating valve of the second unit so as to carry out filtering discharging on the second unit; and when the pressure of the first unit raises, switching off the isolating valve of the second unit, switching on the isolating valve of the first unit so as to carry out filtering discharging on the first unit, and repeatedly executing the steps. By determining a time window in which each unit discharges in alternative operation, the pressure of a containment vessel of the two units is not enabled to exceed a safety limit value under the condition of reducing the switching frequency as soon as possible. According to the two-unit alternative-discharging method, hardware investment of a nuclear station does not need to be increased, the capacity of coping two-unit serious accidents by the nuclear station with two units is improved, and the probability of a large quantity of radiological release is reduced.

Description

technical field [0001] The invention belongs to reactor design technology, and in particular relates to a double-unit alternate discharge method of a containment filter discharge system. Background technique [0002] Containment filtration and discharge system is one of the measures for nuclear power plants to deal with severe accidents. In the event of a serious accident of pressure vessel melt-through, due to the continuous increase of non-condensable gas produced by the reaction between the molten core and the concrete floor, or the failure of the containment spray system, the pressure in the containment will gradually increase, which may damage the containment. Integrity, resulting in the release of a large amount of radioactive material. The containment filtration and discharge system can prevent containment failure by actively depressurizing so that the pressure in the containment does not exceed its bearing limit. At the same time, the exhaust gas is filtered throug...

AI Technical Summary

Problems solved by technology

It is very difficult to add a set of containment filtration and discharge systems to nuclear power plants in operation and under construction to achieve single use for a single reactor. However, it is very difficult to use a shared set of containment filtration and discharge systems to filter and discharge dual units at the same time (that is, open the two containment connections at the same time. Isolation valve on the pipeline), it will bring consequences such as the flow rate of the filter exceeds the design flow rate, and the atmosphere communication between the two containment vessels

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