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AEGIS: AN ADVANCED LATTICE PHYSICS CODE FOR LIGHTWATER REACTOR ANALYSES
AKIO YAMAMOTO,TOMOHIRO ENDO,MASATO TABUCHI,NAOKI SUGIMURA,TADASHI USHIO,MASAAKI MORI,MASAHIRO TATSUMI,YASUNORI OHOKA 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.5
AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculationmodels and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objectiveof the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysiscode, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validationefforts related to the AEGIS code.
AEGIS: AN ADVANCED LATTICE PHYSICS CODE FOR LIGHT WATER REACTOR ANALYSES
Yamamoto, Akio,Endo, Tomohiro,Tabuchi, Masato,Sugimura, Naoki,Ushio, Tadashi,Mori, Masaaki,Tatsumi, Masahiro,Ohoka, Yasunori Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.5
AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculation models and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objective of the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysis code, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validation efforts related to the AEGIS code.
Akio Yamamoto,Akinori Giho,TOMOHIRO ENDO 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.6
This paper describes recent development activities of the GENESIS code, which is a transport code for heterogeneous three-dimensional geometry, focusing on applications to reactor core analysis. For the treatment of anisotropic scattering, the concept of the simplified Pn method is introduced in order to reduce storage of flux moments. The accuracy of the present method is verified through a benchmark problem. Next, the iteration stability of the GENESIS code for the highly voided condition, which would appear in a severe accident (e.g., design extension) conditions, is discussed. The efficiencies of the coarse mesh finite difference and generalized coarse mesh rebalance acceleration methods are verified with various stabilization techniques. Use of the effective diffusion coefficient and the artificial grid diffusion coefficients are found to be effective to stabilize the acceleration calculation in highly voided conditions.
Masahide Ikeguchi,Keisuke Goto,June Watanabe,Shoichi Urushibara,Tomohiro Osaki,Kanenori Endo,Shigeru Tatebe,Seiichi Nakamura 한국간담췌외과학회 2019 Annals of hepato-biliary-pancreatic surgery Vol.23 No.4
Backgrounds/Aims: The prognostic nutritional index (PNI) is based on the albumin concentration and absolute lymphocyte count and is designed to assess the nutritional and immunological status of patients. In this study, we evaluated the prognostic importance of the preoperative and postoperative PNI in patients who underwent curative resection of pancreatic ductal adenocarcinoma (PDAC). Methods: From 2006 to 2017, 50 patients with PDAC underwent curative resection at our hospital. We performed distal pancreatectomy (DP) with splenectomy in 15 patients, pancreaticoduodenectomy (PD) in 27 patients, PD combined with portal vein partial resection in 6 patients, and total pancreatectomy with splenectomy in 2 patients. We compared the preoperative PNI and postoperative PNI (1 and 2 months postoperatively) and analyzed the prognostic importance for these patients. Results: The mean PNI significantly decreased from 45.5 preoperatively to 39.8 at 1 month postoperatively (p<0.001), but recovered to 42.7 at 2 months postoperatively. In 23 patients, the PNI at 2 months postoperatively recovered to the preoperative level (recovered group), but in the remaining 27 patients, the PNI at 2 months postoperatively did not reach the preoperative level (non-recovered group). The overall median survival time in the recovered group (29 months) was significantly longer than that in the non-recovered group (12 months, p=0.003). The multivariate overall analysis demonstrated that good recovery of the postoperative PNI was strongly correlated with a better prognosis. Conclusions: Effective postoperative nutrition may have a prognostic benefit for patients with operable PDAC.
Benchmarks of subcriticality in accelerator-driven system at Kyoto University Critical Assembly
Cheol Ho Pyeon,Masao Yamanaka,김송현,Thanh-Mai Vu,TOMOHIRO ENDO,Willem Fredrik G. Van Rooijen,GO CHIBA 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.6
Basic research on the accelerator-driven system is conducted by combining 235U-fueled and 232Th-loaded cores in the Kyoto University Critical Assembly with the pulsed neutron generator (14 MeV neutrons) and the proton beam accelerator (100 MeV protons with a heavy metal target). The results of experimental subcriticality are presented with a wide range of subcriticality level between near critical and 10,000 pcm, as obtained by the pulsed neutron source method, the Feynman-α method, and the neutron source multiplication method.