Method for depressurizing a nuclear power plant, depressurization system for a nuclear power plant, and associated nuclear power plant

A depressurization system for a nuclear power plant having a containment shell for containing activity carriers and having an outlet for a depressurization flow, the depressurization system comprising:

• a depressurization line connected to the outlet and having a high-pressure section;
• a filter system connected in said depressurization line, said filter system containing a filter chamber having a filter chamber inlet, a filter chamber outlet and a sorbent filter lying there-between;
• a throttle device connected into said depressurization line at an end of said high-pressure section, said depressurization line opening out downstream of said throttle device into said filter chamber inlet;
• a blow-out unit having a blow-out opening formed therein and leading to atmosphere, said filter chamber outlet connected to said blow-out opening leading into the atmosphere;
• and
• said depressurization line having a superheating section disposed between said throttle device and said filter chamber inlet, said superheating section having heat-exchanger surfaces and being thermally coupled to said high-pressure section via said heat-exchanger surfaces, said heat-exchanger surfaces being dimensioned such that the depressurization flow established under design-basis accident conditions in said superheating section is heated to a temperature which is at least 10° C. above a dew-point temperature present there.

A nuclear power plant, comprising:

• a containment shell for containing activity carriers and having an outlet;
• a depressurization system, containing:
• a depressurization line connected to said outlet of said containment shell and having a high-pressure section;
• a filter system connected in said depressurization line, said filter system containing a filter chamber having a filter chamber inlet, a filter chamber outlet and a sorbent filter lying there-between;
• a throttle device connected into said depressurization line at an end of said high-pressure section, said depressurization line opening out downstream of said throttle device into said filter chamber inlet;
• a blow-out unit having a blow-out opening formed therein and leading to atmosphere, said filter chamber outlet connected to said blow-out opening leading into the atmosphere;
• said depressurization line having a superheating section disposed between said throttle device and said filter chamber inlet, said superheating section having heat-exchanger surfaces and being thermally coupled to said high-pressure section via said heat-exchanger surfaces, said heat-exchanger surfaces being dimensioned such that the depressurization flow established under design-basis accident conditions in said superheating section is heated to a temperature which is at least 10° C. above a dew-point temperature present there.