TAILIEUCHUNG - Px - an innovative safety concept for an unmanned reactor

The ultimate heat transfer mechanism contributes to minimization of the heat exchanger size and containment volume. A small containment can ensure the underground construction, which can use river or seawater as an ultimate heat sink. The changing mechanism of the cooling geometry simplifies several safety systems and unifies diverse functions. Simplicity of the present safety system does not require any operator actions during events or accidents. | Nuclear Engineering and Technology 48 2016 2 68-2 73 Available online at ScienceDirect Nuclear Engineering and Technology journal homepage locate net NUCLEAR_____ ENGINEERING AND Technical Note PX-An Innovative Safety Concept for an Unmanned Reactor Sung-Jae Yi Chul-Hwa Song and Hyun-Sik Park Korea Atomic Energy Research Institute Deadeok-Daero 989-111 Yuseong-Gu Daejeon South Korea ARTICLE INFO ABSTRACT Article history An innovative safety concept for a light water reactor has been developed at the Korea Received 2 March 2015 Accepted 18 August 2015 Available online 28 October 2015 Atomic Energy Research Institute. It is a unique concept that adopts both a fast heat transfer mechanism for a small containment and a changing mechanism of the cooling geometry to take advantage of the potential thermal and dynamic energies of the cold water in the containment. It can bring about rapid cooling of the containment and long- Keywords term cooling of the decay heat. By virtue of this innovative concept nuclear fuel damage Cooling geometry Fast heat transfer Passive system PX Unmanned reactor events can be prevented. The ultimate heat transfer mechanism contributes to minimization of the heat exchanger size and containment volume. A small containment can ensure the underground construction which can use river or seawater as an ultimate heat sink. The changing mechanism of the cooling geometry simplifies several safety systems and unifies diverse functions. Simplicity of the present safety system does not require any operator actions during events or accidents. Therefore the unique safety concept of PX can realize both economic competitiveness and inherent safety. Copyright 2015 Published by Elsevier Korea LLC on behalf of Korean Nuclear Society. 1. Introduction A simple safety system is one of the major design features that can assure the inherent safety and passive operation of a nuclear power plant. In light of the Fukushima Daiichi nuclear accident the .

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