By Masahiko Fujii, Shinichi Morooka (auth.), Takehiko Saito, Junichi Yamashita, Yoshiaki Oka, Yuki Ishiwatari (eds.)
Advances in gentle Water Reactor applied sciences makes a speciality of the layout and research of complex nuclear energy reactors. This quantity offers readers with thorough descriptions of the final features of varied complicated mild water reactors at present being built all over the world. defense, layout, improvement and upkeep of those reactors is book’s the main target, with key applied sciences like complete MOX center layout, next-generation electronic I&C platforms and seismic layout and assessment defined at size. additionally coated are: -Technologies at the moment being constructed and used in a few nations world wide -A variety of new fresh advancements in mild water reactors -Analyses of alternative varieties of gentle water reactors from prime teachers engaged on layout and research Advances in mild Water Reactor applied sciences is the suitable publication for researchers and engineers operating in nuclear energy which are attracted to studying the basics of complex mild water plants.
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Additional info for Advances in Light Water Reactor Technologies
2 The APWR adopts a larger core to increase the number of fuel assemblies from 193 to 257 34 T. Shiraishi Fig. 3 Advanced Safety Systems In the APWR, the emergency core cooling system (ECCS) has a 4-train configuration (4 Â 50% capacity) instead of the conventional 2-train configuration (2 Â 100% capacity) to improve safety. The new configuration increases the reliability of equipment operation in the case of an accident as the best mix of active and passive safety systems. The systems of each train are installed near the corresponding loop to reduce the quantity of piping and enhance the separation and independence of each train.
If a large break LOCA happens, a large flow rate of injected water is required at Step 1 for Core Refilling. The water head in the downcomer drives water into the reactor core at Step 2 for Core Reflooding. At this step, a relatively small flow rate is required because any excess water will flow out of the opening to no purpose. The reactor core will be covered with water at the end of the Core Reflooding and Step 3 starts for Long-Term Cooling. The current 4-loop plants satisfy the requirement of flow rate by conventional accumulators at Step 1, and by low-head and high-head injection pumps at Steps 2 and 3.
Only in this situation can the 3 Â 50% RHR configuration be more reliable than the 2 Â 100% RHR configuration. This is because the success criteria for the 3 Â 50% configuration changes to one-out-ofthree from two-out-of-three success criteria in this situation. If this can be allowed in the RHR safety design, the reliability of the RHR system decreases in the order 4 Â 50% > 3 Â 50% > 2 Â 100%. In this way, the 3 Â 50% RHR configuration becomes acceptable from the standpoint of the safety design.