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Journal Articles

A Preliminary 3D steam flow analysis for CET behavior during LSTF SBLOCA experiment using FLUENT code

Irwanto, D.; Satou, Akira; Takeda, Takeshi; Nakamura, Hideo

Proceedings of 21st International Conference on Nuclear Engineering (ICONE-21) (DVD-ROM), 6 Pages, 2013/07

Journal Articles

Major outcomes from OECD/NEA ROSA and ROSA-2 projects

Nakamura, Hideo; Takeda, Takeshi; Satou, Akira; Ishigaki, Masahiro; Abe, Satoshi; Irwanto, D.

Proceedings of 15th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-15) (USB Flash Drive), 21 Pages, 2013/05

JAEA Reports

Study on calculation methods for the effective delayed neutron fraction

Irwanto, D.*; Chiba, Go; Nagaya, Yasunobu; Obara, Toru*

JAEA-Research 2010-061, 28 Pages, 2011/03

JAEA-Research-2010-061.pdf:1.1MB

It is rather difficult to measure the effective delayed neutron fraction with experiments, so it becomes important to obtain their accurate calculation values. We study calculation methods for the effective delayed neutron fraction by analyzing various fast neutron systems including the bare spherical systems (Godiva, Jezebel, Skidoo, Jezebel-240), the reflective spherical systems (Popsy, Topsy, Flattop-23), MASURCA-R2 and MASURCA-ZONA2, and FCA XIX-1, XIX-2 and XIX-3. These analyses are performed by using SLAROM-UF and CBG for the deterministic method and MVP-II for the Monte Carlo method. We calculate the effective delayed neutron fraction with various definitions such as the fundamental value, the standard definition, Nauchi's definition and Meulekamp's definition, and compare these results with each other.

Journal Articles

Comparison of Monte Carlo calculation methods for effective delayed neutron fraction

Nagaya, Yasunobu; Chiba, Go; Mori, Takamasa; Irwanto, D.*; Nakajima, Ken*

Annals of Nuclear Energy, 37(10), p.1308 - 1315, 2010/10

 Times Cited Count:22 Percentile:83.39(Nuclear Science & Technology)

Monte Carlo calculation methods to estimate the effective delayed neutron fraction $$beta_mathrm{eff}$$ are investigated: One is proposed by Meulekamp et al. and the other is by Nauchi et al. It is revealed that both the methods calculate the delayed neutron fraction weighted with the importance functions defined by Kobayashi. The accuracy of the methods are also examined for several simple benchmark systems. Consequently, it is found that Meulekamp's method causes $$sim$$5% discrepancies in the $$beta_mathrm{eff}$$ values for fast systems; Nauchi's method gives good results for fast bare systems but $$sim$$10% discrepancies for fast reflected systems. Both the methods calculate the $$beta_mathrm{eff}$$ values approximately within the accuracy of $$sim$$2% for thermal systems.

Oral presentation

Study on calculation methods for effective delayed neutron fraction

Irwanto, D.*; Chiba, Go; Nagaya, Yasunobu; Obara, Toru*

no journal, , 

To calculate the effective delayed neutron fraction $$beta_{eff}$$ with a Monte Carlo code, Nauchi's method and van der Marck's method have been proposed. The errors due to these methods are quantified by using a deterministic code. It is found that van der Marck's method always results in larger values of $$beta_{eff}$$ than Nauchi's method and that a multi-generation effect, which is neglected in both the methods, has a significant impact on $$beta_{eff}$$ for reflected systems.

Oral presentation

Oral presentation

Study on density stratification behavior in a reactor containment vessel during a sever accident

Abe, Satoshi; Ishigaki, Masahiro; Shibamoto, Yasuteru; Okagaki, Yuria; Satou, Akira; Takeda, Takeshi; Irwanto, D.; Yonomoto, Taisuke

no journal, , 

no abstracts in English

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