process to depressurize a nuclear power plant, depressurization system to a corresponding nuclear power plant

摘要

process for depressurising a nuclear power plant, depressurization system for a nuclear power plant and corresponding nuclear power plant. The present invention relates to a process for the respective system for depressurizing a nuclear power plant (2), with a holding ball (4) for holding activity carriers and with an outlet (10, 10 ') for a depressurization flow, where a depressurization line (12, 12 ') with a filtration system is conducted out of the containment ball (4) into the atmosphere, where the filtration system comprises a filtration chamber (16) with a filtration chamber inlet (124), a filtration chamber outlet (128) and a sorbent filter (18) in between, and where the depressurization flow is first conducted to a high pressure section (70), It is then relaxed by expansion into a choke device (72), then at least partially conducted through the filtration chamber (16) with the sorbent filter (18) and finally released into the atmosphere. In order to enable especially efficient and effective retention of activity carriers contained in the depressurization flow, especially iodine-containing organic compounds, it is provided according to the present invention that the depressurization flow is relaxed by the throttling device ( 72) Immediately prior to its entry into the filtration chamber (16) it is conducted through an overheating segment (80), where it by direct or indirect heat transfer of the yet un relaxed relaxation of the depressurization flow in the high pressure section. (70) is heated to a temperature which is at least 10 ° C, preferably 20 ° C to 50 ° C above the dew point temperature there.