MISC - 遠藤　知弘

Critical Experiments in Kyoto University Critical Assembly for Development of >5wt% Enrichment Erbia Bearing Super High Burnup Fuel 査読有り 国際誌

T. Endo, M. Yamasaki, T. Kuroishi  

Proc. Nuclear Criticality Safety Division Topical Meeting on Realism, Robustness and the Nuclear Renaissance (NCSD 2009)   頁： 536 - 545   2009年9月

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究発表ペーパー・要旨（国際会議）  

In order to improve fuel cycle economics with securing critical safety, the development project on Erbia bearing Super High Burnup (Er-SHB) fuel with >5wt% uranium enrichment is in progress. In this project, a series of critical experiments of erbia loaded core have been performed at Kyoto University Critical Assembly (KUCA). In order to accumulate experimental data under various conditions, four erbia loaded critical cores have been constructed by changing averaged enrichment, erbia content, and H/U-235 ratio. Several experimental data such as criticality and erbia sample worth have been measured. In this paper, we will show the numerical analyses by using probabilistic and deterministic methods. As a result, the C/E values are evaluated by the Monte Carlo method can be predicted within 0.998-1.004, thus the prediction accuracy of criticality for erbia loaded core is validated. For the erbia sample worth evaluated by the deterministic code, it could be generally concluded that significant discrepancy between calculation and measurement could not be observed. However, further study such as the treatment of heterogeneous effects in the fuel elements will be necessary to finalize the C/E values.

Study on Kinetic Transport Solvers for Pin-by-Pin Core Calculation 査読有り 国際誌

T. Endo, M. Tatsumi  

Proc. International Conference on the Physics of Reactors (Physor2008)   頁： 981 - 987   2008年9月

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究発表ペーパー・要旨（国際会議）  

SCOPE2 is an advanced core calculation code to solve the multi-group SP3 transport equations within three-dimensional pin-by-pin geometry. For the purpose of wider range of applicability such as analysis for dynamic rod worth measurements, widely known kinetic solvers have been implemented in SCOPE2. The implemented solvers are the backward Euler, the theta, and the frequency-transform method. In implementing the theta method in SCOPE2, an automatic determination of weighting parameter is adopted in order to obtain stable solutions with as high accuracy as possible. In the frequency-transform method, the space- and energy dependant frequency is estimated to reduce the discretization error of transformed neutron flux. Through an analysis of the 3-D LMW benchmark problem without thermal hydraulic feedback, it was demonstrated that the kinetic solvers are correctly implemented in SCOPE2, and the accuracy of each solver was verified.

Yet Another Optimum Polar Angle Quadrature Set for the Method of Characteristics 査読有り 国際誌

M. Tabuchi, A. Yamamoto, T. Endo, N. Sugimura, T. Ushio, M. Mori  

Trans. Am. Nucl. Soc.93 巻   頁： 506 - 507   2005年11月

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記述言語：英語   掲載種別：研究発表ペーパー・要旨（国際会議）   出版者・発行元：American Nuclear Society  

Medical Isotope Production Using Pressurized Water Reactor 査読有り

T. Endo;A. Yamamoto  

Proc. International Symposium on Isotope Science and Engineering from Basic to ApplicationsCD-ROM 巻   2005年9月

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究発表ペーパー・要旨（全国大会，その他学術会議）  

Efficient Calculation of Time-Dependent Neutron Transport Equation using the Constrained Interpolated Profile (CIP) Method 査読有り 国際誌

S. Kano, T. Endo, A. Yamamoto, Y. Yamane, Y. Kitamura  

Proc. International topical Meeting on Mathematics and Computation, Supercomputing, Reactor Physics and Nuclear and Biological Applications (M&C2005)   頁： CD-ROM   2005年9月

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記述言語：英語   掲載種別：研究発表ペーパー・要旨（国際会議）  

Development of Advanced Neutronics Design System of Next Generation, AEGIS 査読有り 国際誌

N. Sugimura, T. Ushio, M. Mori, A. Yamamoto, M. Tabuchi, T. Endo  

Proc. International topical Meeting on Mathematics and Computation, Supercomputing, Reactor Physics and Nuclear and Biological Applications (M&C2005)   頁： CD-ROM   2005年9月

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記述言語：英語   掲載種別：研究発表ペーパー・要旨（国際会議）  

Derivation of the Space and Energy Dependent Formula for the Third Order Neutron Correlation Technique 査読有り 国際誌

T. Endo, Y. Kitamura, A. Yamamoto, Y. Yamane  

Proc. PHYSOR 2004: The Physics of Fuel Cycles and Advanced Nuclear Systems: Global Developments   頁： 1085 - 1095   2004年4月

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究発表ペーパー・要旨（国際会議）  

We have studied a measurement technique of subcriticality by using the neutron correlation methods. Among various techniques, we have paid attention to the third order neutron correlation technique, which utilizes the third order fluctuations of neutron counts. By using this technique, we can obtain the absolute value of subcriticality without prior knowledge of the prompt neutron decay constant at a reference state. To apply the third order neutron correlation technique to actual experiments, we must consider the effects of the spatial and neutron energy distributions in this technique. For this purpose, we derived the generalized theoretical formulas of the third order neutron correlation technique that took account of the spatial and neutron energy effects.

Absolute Measurement of the Subcriticality Based on the Third Order Neutron Correlation in Consideration of the Finite Nature of Neutron Counts Data 査読有り 国際誌

T. Endo, Y. Kitamura, Y. Yamane  

Proc. the 7th International Conference on Nuclear Criticality Safety ICNC2003; Challenges in the Pursuit of Global Nuclear Criticality Safety   頁： 215 - 220   2003年10月

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究発表ペーパー・要旨（国際会議）   出版者・発行元：Japan Atomic Energy Agency  

We have studied a measurement of subcriticality by using the neutron correlation method. Furuhashi proposed an absolute measurement of subcriticality by using the third order neutron correlation factor X in addition to the second order neutron correlation factor Y. In actual experiments, the number of neutron counts data is not infinity so that we take the effect of the finite nature of the neutron counts data into account. We derived new formulas in consideration of the number of data and verified them.

DOI： 10.11484/jaeri-conf-2003-019