By Masahiko Fujii, Shinichi Morooka (auth.), Takehiko Saito, Junichi Yamashita, Yoshiaki Oka, Yuki Ishiwatari (eds.)
Advances in gentle Water Reactor applied sciences specializes in the layout and research of complicated nuclear strength reactors. This quantity presents readers with thorough descriptions of the overall features of assorted complicated mild water reactors presently being built around the globe. safeguard, layout, improvement and upkeep of those reactors is book’s the focus, with key applied sciences like complete MOX center layout, next-generation electronic I&C platforms and seismic layout and review defined at size. additionally coated are: -Technologies at the moment being constructed and used in a couple of nations around the world -A variety of new fresh advancements in gentle water reactors -Analyses of other kinds of mild water reactors from best lecturers engaged on layout and research Advances in mild Water Reactor applied sciences is definitely the right publication for researchers and engineers operating in nuclear strength which are drawn to studying the basics of complicated gentle water plants.
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4 Characteristics of the Advanced Accumulator The configurations of the current and new safety systems are shown in Fig. 11. The current safety system is composed of conventional accumulators, low-head injection pumps and high-head injection pumps, which are not shown within the figure. The new safety system is composed of Advanced Accumulators and safety injection pumps, which are also not represented within the figure. The Advanced Accumulator has a flow damper at the bottom of the tank. ) Fig.
8 compares the ECCS configurations of the current 4-loop PWR and APWR. The current 4-loop PWR has two trains of injection systems, conventional accumulators, and a refueling water storage pit outside of the containment vessel. The APWR has some improvements, which include the following: 1. Four trains of the injection system composed of simplified pipe routing for higher reliability 2. Four Advanced Accumulators that allow for the elimination of low-head safety injection pumps 3. An in-containment refueling water storage pit located in the containment vessel for higher reliability Thus, the current ECCS is composed of the accumulator injection system with conventional accumulators, a low-head injection subsystem, and a high-head injection subsystem.
The APWRs have realized a large capacity increase of about 30% or more, compared with the current 4-loop PWRs as shown in Fig. 1. The main features of APWR plant components, as outlined in this section, are as follows: 1. Large reactor core and main components with large capacity (steam generator, primary coolant pump, pressurizer, and turbine) Fig. 1 The trend in output capacity of PWR plants 2 The Advanced Accumulator: A New Passive ECCS Component of the APWR 33 2. Advanced safety systems (four subsystems and refueling water storage pit installed in the reactor containment) 3.