Emission monitoring system for a venting system of a nuclear power plant
An emission monitoring system for a venting system of a nuclear power plant is configured for low consumption of energy and high reliability. The emission monitoring system has a pressure relief line connected to a containment and contains a high-pressure section, a low-pressure section, and a sampling line. The sampling line opens into the low-pressure section of the pressure relief line and is guided from there to a functional path and through the sampling line steam flows. A jet pump containing a pump fluid connector, a suction connector and an outlet connector is provided. A pump fluid feed line has an inlet side opening into the high-pressure section of the pressure relief line and is guided from there to the jet pump and connected to the pump fluid connector. A sample return line is guided from the functional path to the jet pump and connected to the suction connector.
1. An emission monitoring system for a venting system of a nuclear power plant, the nuclear power plant having a containment, the emission monitoring system comprising:
a pressure relief line configured to receive emissions from the containment of the nuclear power plant and having a high-pressure portion and a low-pressure portion;
a functional section having at least one element selected from the group consisting of an online analyzer and a filter;
a sampling line having an intake mouth opening into said low-pressure portion of said pressure relief line and is lead therefrom to said functional section, through which sample stream can flow;
a jet pump having a propellant fitting, a suction fitting, and an outlet fitting;
a propellant supply line having an intake side opening into said high-pressure portion of said pressure relief line and is led from there to said jet pump and is connected to said propellant fitting; and
a sample return line leading from said functional section to said jet pump and is connected to said suction fitting.
2. The emission monitoring system according to claim 1 , further comprising a return line leading from said outlet fitting of said jet pump into said low-pressure portion of said pressure relief line and discharges therein on an outlet side.
3. The emission monitoring system according to claim 2 , wherein said sample return line has an outlet mouth disposed, viewed in a flow direction of vent stream in said pressure relief line, after said intake mouth of said sampling line.
4. The emission monitoring system according to claim 1 , further comprising a jacket pipe, at least one of said sampling line or said sample return line are led in said jacket pipe, through which a heating medium can flow.
5. The emission monitoring system according to claim 4 , wherein said jacket pipe is provided such that a partial stream of vent stream which is branched off is active as the heating medium in said pressure relief line.
6. The emission monitoring system according to claim 5 , wherein the heating medium is oriented in a same direction as the sample stream.
7. The emission monitoring system according to claim 1 , wherein said functional section is disposed outside of said pressure relief line.
8. The emission monitoring system according to claim 1 , wherein said functional section has a filter section with said filter, said filter including an aerosol filter and/or an iodine filter.
9. The emission monitoring system according to claim 1 , wherein said functional section contains an analysis section having said online analyzer being one of a plurality of online analyzers selected from the group consisting of an aerosol analyzer, a noble gas analyzer, and an iodine analyzer, said online analyzers are configured for capturing associated radiological activities.
10. The emission monitoring system according to claim 1 , further comprising a throttle portion disposed between said high-pressure portion and said low-pressure portion.
11. The emission monitoring system according to claim 10 , wherein said throttle portion is a throttle orifice.
12. A nuclear power plant, comprising:
a venting system; and
an emission monitoring system according to claim 1 and connected to said venting system.