Nuclear power plant atmospheric steam dump device and secondary loop pressure release method
A discharge device and nuclear power plant technology, applied in the field of nuclear power plants, can solve problems such as external environmental impacts, and achieve the effect of reducing radioactive pollution and suppressing risks
Pending Publication Date: 2017-08-18
CHINA NUCLEAR POWER TECH RES INST CO LTD +2
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Problems solved by technology
However, during the pressure relief process of the current VDA, the contaminated radioactive steam in the secondary circuit will be released into the atmosphere in large quantities due to high temperature and high pressure, which will have a great impact on the external environment.
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[0015] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0016] Since medium pressure safety injection nuclear power plants usually adopt anti-flooding measures, that is, there will be no risk of liquid release from damaged steam generators, so the radioactive release is related to the total mass of radioactive gases discharged. The invention provides a nuclear power plant steam The atmospheric discharge device is used to reduce the total mass of radioactive gas discharged to the outside during the pressure relief process under accident conditions.
[0017] Such as figure 1 As shown, the containment vessel 1 is located in the safety plant 2, the steam generator 3 is located in the containment vessel 1, the main steam pipeline 31 of the steam generator 3 passes out of the containment vessel 1 through the containment penetrating piece 11, and the main steam pipeline 31 A main steam isolation valve 32 is p...
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The invention discloses a nuclear power plant atmospheric steam dump device which comprises a dump isolating valve, a main dump control valve and an auxiliary dump control valve. The dump isolating valve is arranged on a first dump pipeline connected with main steam pipelines, and the main dump control valve and the auxiliary dump control valve are respectively arranged on two second dump pipelines connected with the first dump pipeline. Correspondingly, the invention further discloses a secondary loop pressure release method. A plurality of the dump devices are respectively connected with the main steam pipelines of a plurality of steam generators. After an accident occurs, the steam generator which is broken is isolated by controlling opening and closing of different valves, other steam generators exhaust for cooling and depressurizing, and then the broken steam generator is exhausted to lower secondary loop pressure to saturation pressure. By the dump device and the method, dump of radioactive steam can be reduced greatly, and water in a secondary loop can be prevented from flowing back into a primary loop.
Description
technical field [0001] The invention relates to the technical field of nuclear power plants, in particular to a device for discharging steam and air in a secondary circuit of a nuclear power plant and a pressure release method under an accident. Background technique [0002] The main equipment of the medium-voltage safety injection nuclear power plant includes pressure vessels, pressurizers, steam generators (SG for short), steam turbines, generators and condensers. Among them, the pressure vessel, voltage stabilizer and SG (generally there are 3) are located in the containment vessel, and nuclear fuel is loaded in the pressure vessel, while equipment such as steam turbine, generator and condenser are located outside the containment vessel. The pressure vessel and the heat transfer tube located in the SG form a primary circuit. The main steam pipeline of the SG passes through the containment penetration to go out of the containment and forms a secondary circuit with the stea...
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Login to View More IPC IPC(8): G21C13/02G21C13/10
CPCG21C13/022G21C13/10Y02E30/30
Inventor 林建树卢向晖王婷方思远林支康梁任黄熙杨江吕逸君
Owner CHINA NUCLEAR POWER TECH RES INST CO LTD