Numerical analyses of design extension conditions for sodium-cooled fast reactor designed in Japan

Yamano, Hidemasa; Kubo, Shigenobu; Tokizaki, Minako*; Nakamura, Hironori*

Proceedings of International Conference on Topical Issues in Nuclear Installation Safety; Strengthening Safety of Evolutionary and Innovative Reactor Designs (TIC 2022) (Internet), 12 Pages, 2022/10

Specific design features of advanced sodium-cooled fast reactors (SFRs) designed in Japan are a passive reactor shutdown system, a passive decay heat removal system (DHRS), and an in-vessel retention (IVR) concept against an anticipated transients without scram (ATWS) in design extension condition (DECs). The present paper describes numerical analysis methodologies for event sequences studied in Japan and some numerical analyses of DECs to show the effectiveness of the passive shutdown system against a typical ATWS and severe accident mitigation measures for the IVR of molten core. For the passive shutdown capability, the numerical analysis has demonstrated the effectiveness of a self-actuated shutdown system against a severe ATWS event, for which the temperature response time was separately evaluated by a computational fluid dynamics (CFD) code. A recently developed debris-bed cooling analysis methodology coupled with a CFD code and a debris-bed module has successfully simulated a three-dimensional coolant flow field near the debris bed with the passive DHRS capability in order to demonstrate the debris-bed coolability on a core catcher.

Distance Information Display System using augmented reality for supporting decommissioning work

Miki, Naoya*; Harazono, Yuki*; Ishii, Hirotake*; Shimoda, Hiroshi*; Koda, Yuya

Proceedings of 2nd International Conference on Computer-Human Interaction Research and Applications (CHIRA 2018) (USB Flash Drive), p.134 - 140, 2018/09

https://doi.org/10.5220/0006928601340140

In this study, in order to make measuring lengths of the objects and the gaps at NPPs more efficient, the Distance Information Display System was developed, which make it easy for the dismantling workers to measure them. The results showed that the Distance Information Display System developed in this study can be used easily with extremely simple operation by the dismantling workers at NPPs, and the workers can also measure the lengths in a short time.

The Initiative towards construction of Knowledge Management System in FUGEN Decommissioning Engineering Center

Tezuka, Masashi; Taruta, Yasuyoshi; Koda, Yuya

Dekomisshoningu Giho, (56), p.46 - 54, 2017/09

Implementation of decommissioning needs much plant information in period of Design, construction and operation. In addition, it is essential for efficient dismantling works to advance the technologies, data, lessons and learns, experiences and documents by getting through the decommissioning process. On the other hands, as workers who operated or maintained the plant are aging and retiring, their empirical knowledge has been lost. For the purpose of safety and reasonability of further decommissioning activities, Knowledge Management System (KMS) has been producing in FUGEN which is now under decommissioning. KMS is an initiative of human resources development and to pass on expertise and knowledge to the younger generations. The system based on the prototype of FUGEN aims a high versatility system available for further decommissioning facilities.

Proposal of 3-phase spectrum analyzer based on rotating coordinate transformations

Nakano, Hirotami*; Aono, Yoshinori*; Naito, Masanobu*; Kondo, Ryo*; Eda, Hiroshi*; Matsukawa, Makoto; Miura, Yushi

Denki Gakkai Rombunshi, D, 120D(11), p.1277 - 1282, 2000/11

no abstracts in English

None

Yamada, Susumu*

PNC TJ1632 96-001, 50 Pages, 1996/03

PNC-TJ1632-96-001.pdf:1.33MB

no abstracts in English

Support system for the facilities dismantling using the augmented reality technology

Izumi, Masanori; Koda, Yuya

no journal, , 

http://shingi.jst.go.jp/abst/2015/jaea/tech_property.html#tech02

no abstracts in English

Support system for the facilities dismantling using the augmented reality technology

Koda, Yuya

no journal, , 

no abstracts in English

Summary of derivations and equivalence between bias factor methods and adjustment methods

Yokoyama, Kenji

no journal, , 

no abstracts in English

Application of the extended bias factor method for highly reliable benchmark suite

Tokashiki, Mikio*; Ikehara, Tadashi*; Tada, Kenichi; Egawa, Toru*; Yokoyama, Kenji; Iwamoto, Osamu

no journal, , 

The bias factor methods have been widely used for applications to reduce uncertainties of the predicted value in the reactor physics characteristics. In the present study, an attempt has been made to apply the extended bias factor method to qualifying the reliability of measured data by assuming the uncertainty of the numerical model being negligible and the covariance of cross section being reliable. In this presentation, comparison results will be shown between actual measured value and the predicted value of a benchmark case sampled from the benchmark suite. Furthermore, it will be shown that the comparison and their uncertainty enable us to qualify the degree of reliability of the actual measured value.

情報処理方法、情報処理装置、及び、情報処理システム

佐藤 優樹

not registered

JP, 2022-031560  Patent licensing information  Patent publication (In Japanese)

【課題】現実空間と仮想空間との間で簡便に情報共有を行うことを可能とする情報処理方法を提供する。 【解決手段】情報処理方法は、現実空間を撮影した複数の静止画データを取得するデータ取得工程(S100)と、複数の静止画データのうち少なくとも1つの静止画データに撮影された対象物に対応付けて、現実空間の対象物に第1の仮想イメージを重畳表示させるためのマーカ情報を作成するマーカ情報作成工程(S110~S112)と、複数の静止画データに基づいて現実空間の三次元モデルを作成する三次元モデル作成工程(S120~S123)と、三次元モデルに含まれる対象物に対応付けて、三次元モデルに基づいて表示される仮想空間の対象物に第2の仮想イメージを重畳表示させるためのオブジェクト情報を作成するオブジェクト情報作成工程(S130~S132)と、を有する。