Boiling water reactors systems core components

If the water tank of a passive heat removal system (PHRS) is included as the reactor installation component, it is possible to remove heat from the core via the wall of the reactor mono-block vessel. In the failure of all reactor systems, the PHRS tank offers passive heat removal from the mono-block vessel through the evaporation of water from the tank (by boiling) and steam disposal via the air tubes to the atmosphere. The quantity of water stored in the tank is sufficient to remove heat from the reactor over a 5-day period without any damage to the reactor core. 

The potential applications of SiC SiC composites currently considered are core components, especially the control rod sheath and cladding of the VHTR, GFR, SFR, MSR, and LFR. Because the scope of this chapter is restricted to the Generation IV system, only part of the nuclear applications of SiCf/SiC was described. However, SiC SiC composites are also considered as the in-vessel components of magnetic confinement fusion devices including blanket structures, flow channel inserts (FCI) for the liquid metal (LM) blankets, and plasma-facing components (PFCs) [88—91]. In addition, they are candidates for an advanced fuel cladding for LWRs as an ATF (accident tolerance fuel) concept [72,92—97] and a channel box for the BWRs (boiling water-cooled reactors) [96,98,99]. 

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