Materials and Water Chemistry

Developments and tests of candidate materials for fuel cladding and in-core structures of the SCPR, Super FR, and Super LWR are mainly performed in joint projects among universities, research institutes, and industries. 

Based on the advanced austenitic stainless steel (PNC1520) with high creep strength developed by IAEA for sodium cooled fast reactors [46], the candidate 

Void swelling Grain boundary segregation Phase 

Supercritical water exhibits unique properties. Its chemistry and radiolysis have been studied by the research group on radiarimi chemistry at the University of Tokyo in collaboration with research institutes and industries. The R D items of supercritical water chemistry under a radiation field are described in Fig. 8.9 [51]. Fimdamental studies on radiolysis of supercritical water were conducted at the 

University of Tokyo under the support by Japan Society for the Promotion of Science (JSPS) [52-57]. Then, the chemistry of supercritical pressure water under a radiation field was studied under a joint project by the University of Tokyo, JAEA, Central Research Institute of Electric Power Industry (CRIEPI), Hitachi Ltd., and Toshiba Corporation supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [51, 58-62]. 

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Lithium hydroxide is chosen for its compatibility with the material and water chemistry of borated water, stainless steel, and zirconium systems (see Section 9.3.6.2.3 2 of Reference 6.1). In addition, lithium-7 is produced in the core region because of irradiation of the dissolved boron in... 

Preliminary safety analyses have been performed (Barinov et al., 2009). Both RDIPE concepts rely on the following materials and water chemistry solutions exclusion of copper-containing alloys and use a titanium condenser neutral water chemistry with demineralization of turbine condensate and oxygen injection into condensate to reduce transport of corrosion products and suppression of water coolant radiolysis by injection of gaseous hydrogen, ammonia, or hydrazine into feed water. 

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