MULTIPLE CHOICES OF REACTOR CORE NUCLEAR DESIGN FOR ACP100’S APPLICATION IN DIFFERENT SCENARIOS

ACP100 NPP designed by CNNC (China National Nuclear Corporation) is a 125MWe, multi-purpose small modular reactor based on pressurized water technology; it adopts the integrated technology. Different application scenarios bring up different design requirements: some require high compactness, but others care more about longer cycle length, and may fully mature conservative design; thus, multiple choices need to be proposed. Also, same most important thing cared all users that, needs validated satisfy current nuclear safety standards, lower cost would always preferred. Core key part of whole design. Basically, target achieve reasonable good balance during larger discharge exposure for fuel assemblies, maximally using technologies, course, with sufficient reactivity control ability assurance. Aiming at satisfying these maximally, strategy supplying proposed ACP100: choice 1. Boron-free plan, this compact no chemistry volume system, daily boron adjustment relative waste storage; 2. Boron rod co-controlled similar large commercial PWRs, power peak factor suitable broad location sites. Both load 57 units type assemblies CF3S (with height reduced from CF3 assemblies) per cycle, both adopt partial reload shuffle management exposure. Gd loaded in rods help reactivity. Choice 1 loads much clusters than 2, compensation operation totally between them. Using reliable software simulate core, through amount optimization, 24-month length; average reach 40000MWd/tU, which competitive among SMRs, especially boron-free ones; margin meet requirements.