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Journal Articles

Worldwide status and issue of nuclear safety against pandemic

Kobayashi, Tetsuro*; Takata, Takashi; Narumiya, Yoshiyuki*; Iida, Susumu*

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 63(1), p.50 - 54, 2021/01

Since December 2019, the new coronavirus infectious disease COVID-19, which has occurred mainly in Wuhan City, Hubei Province, China, rapidly spread as a pandemic (a global pandemic of infectious diseases). And thus it affected financial and social issues extremely. In this paper, the current status and issues of non-medical measures in Japan and overseas are explained with regard to the safety of nuclear facilities against pandemics.

Journal Articles

For better understanding of PRA; Guidance for better usage and application of PRA, 3; Consideration of external hazard in PRA

Takata, Takashi*; Yamano, Hidemasa; Narumiya, Yoshiyuki*

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 62(8), p.448 - 451, 2020/08

This report describes risk analysis applicable to selection and evaluation of external hazards in risk assessment. Volcanic ash hazard evaluation is shown as one of hazard evaluations. The objective of the risk assessment is to secure and improve the safety of nuclear installation. This report also describes discussion on the process of response informed based on risk evaluation against external hazards.

Journal Articles

Seismic safety logic on design and analysis for nuclear power plants

Narumiya, Yoshiyuki*; Ohashi, Hirotada*; Miyata, Koichi*; Watanabe, Norio

Dai-13-Kai Nihon Jishin Kogaku Shimpojiumu Rombunshu (DVD-ROM), p.1159 - 1166, 2010/11

no abstracts in English

Journal Articles

Seismic safety logic on design and analysis for nuclear power plants

Ohashi, Hirotada*; Narumiya, Yoshiyuki*; Miyata, Koichi*; Watanabe, Norio

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 52(11), p.732 - 736, 2010/11

no abstracts in English

Journal Articles

Seismic safety logic on design and analysis for nuclear power plants

Ohashi, Hirotada*; Narumiya, Yoshiyuki*; Miyata, Koichi*; Watanabe, Norio

Anzen Kogaku Shimpojiumu 2010 Koen Yokoshu, p.110 - 113, 2010/07

no abstracts in English

Journal Articles

A Technical overview of the Japan's standards for risk-informed decision making

Narumiya, Yoshiyuki*; Hirano, Mitsumasa*; Hirano, Masashi

Proceedings of 18th International Conference on Nuclear Engineering (ICONE-18) (CD-ROM), 7 Pages, 2010/05

Over the last thirty years, there have been many accomplishments throughout the world with regard to severe accident studies and the development and application of the PSA techniques. Based on the results and experience gained from these efforts, it is necessary to shift the emphasis toward risk-informed decision-making (RIDM) in Japan. In this context, the Atomic Energy Society of Japan (AESJ) has developed an implementation standard for RIDM. In this report, the content and background of the standard are summarized.

Journal Articles

Revision of AESJ Standard "The Code of Implementation of Periodic Safety Review of Nuclear Power Plants"

Hirano, Masashi; Narumiya, Yoshiyuki*

Hozengaku, 8(4), p.14 - 18, 2010/01

The Periodic Safety Review (PSR) was launched in June 1992, when the Agency for Natural Resources and Energy issued a notification that required licensees to conduct comprehensive review on the safety of each existing nuclear power plant (NPP) once approximately every ten years based on the latest technical findings for the purpose of improving the safety of the NPP. In 2006, the Standard Committee of the Atomic Energy Society of Japan established the first version of "The Standard of Implementation for Periodic Safety Review of Nuclear Power Plants: 2006". Taking into account developments in safety regulation on PSR after the issuance of the first version, the Standard Committee has revised the Standard. This paper summarizes background on PSR, such developments and major contents of the Standard as well as the focal points of the revision.

Oral presentation

Improvement of the Level 3 PRA standard and its significance

Yamaguchi, Akira*; Homma, Toshimitsu; Ogura, Katsunori*; Narumiya, Yoshiyuki*

no journal, , 

no abstracts in English

Oral presentation

For discussions with the public for the safety of nuclear power; Risks for judgments

Noguchi, Kazuhiko*; Miyano, Hiroshi*; Muramatsu, Ken*; Narumiya, Yoshiyuki*; Takata, Takashi; Muta, Hitoshi*; Itoi, Tatsuya*; Matsumoto, Masaaki*; Matsunaga, Yoko*; Sugiyama, Kenichiro*

no journal, , 

The risk is used for an index to judge. The risk to be considered varies according to the purpose of the judgment. The analysis of the risk needs the knowledge of the nuclear energy system and society.

Oral presentation

For discussions with the public for the safety of nuclear power; Their trust on safety

Miyano, Hiroshi*; Muramatsu, Ken*; Noguchi, Kazuhiko*; Narumiya, Yoshiyuki*; Takata, Takashi; Muta, Hitoshi*; Itoi, Tatsuya*; Matsumoto, Masaaki*; Matsunaga, Yoko*; Sugiyama, Kenichiro*

no journal, , 

In considering nuclear safety, it is an important task to clarify the relationship with "peace of mind" that is the heart of people. What is the state that scientific safety is something that people feel safe? We considered the relationship between quantified risk and safety, and ways to acquire peace of mind. We analyzed the thresholds of safety risks as a social common, showed a safe condition, and showed the importance of forming a consensus to obtain peace of mind.

Oral presentation

For discussions with the public for the safety of nuclear power; Social risk and nuclear risk

Matsumoto, Masaaki*; Miyano, Hiroshi*; Noguchi, Kazuhiko*; Muramatsu, Ken*; Narumiya, Yoshiyuki*; Takata, Takashi; Muta, Hitoshi*; Itoi, Tatsuya*; Matsunaga, Yoko*; Sugiyama, Kenichiro*

no journal, , 

In society, understanding of risk is various. We will show how to understand risk and describe how to face risks in the society. Individual risks are accepted by individuals, but it is necessary for society to construct a structure in society that allows risks to be tolerated by society. For that purpose, we also describe what social risk is and how society and individuals face social risks and how to choose risks to accept. We consider not only the concept of nuclear risk but also how nuclear risk should be accepted from the viewpoint of disaster prevention for the public.

Oral presentation

For discussions with the public for the safety of nuclear power; Discussion with the public

Matsunaga, Yoko*; Miyano, Hiroshi*; Noguchi, Kazuhiko*; Muramatsu, Ken*; Narumiya, Yoshiyuki*; Takata, Takashi; Muta, Hitoshi*; Itoi, Tatsuya*; Matsumoto, Masaaki*; Sugiyama, Kenichiro*

no journal, , 

After Fukushima Daiichi nuclear accident, it becomes more important risk communication with the public. In discussions with the public in nuclear safety, communication and discussions on risks that not only nuclear risks also social risks are important. Differences in viewpoints, understanding, and thought about risks become communication difficult. We need to discuss risks fairly, appropriately with the public and reduce total social risks.

Oral presentation

For discussions with the public for the safety of nuclear power; Risk assessment for nuclear safety and application to external event

Takata, Takashi; Miyano, Hiroshi*; Noguchi, Kazuhiko*; Muramatsu, Ken*; Narumiya, Yoshiyuki*; Muta, Hitoshi*; Itoi, Tatsuya*; Matsumoto, Masaaki*; Matsunaga, Yoko*

no journal, , 

A considering nuclear safety, it is an important task to clarify the relationship with "peace of mind" that is the heart of people. In this paper, a fundamental methodology of risk assessment for nuclear safety is introduced based on a probabilistic risk assessment (PRA) method. Furthermore, an application of the methodology for an external event is also discussed.

Oral presentation

For discussions with the public for the safety of nuclear power; Applying risk information to prevention/mitigation of SA

Narumiya, Yoshiyuki*; Miyano, Hiroshi*; Noguchi, Kazuhiko*; Muramatsu, Ken*; Takata, Takashi; Muta, Hitoshi*; Itoi, Tatsuya*; Matsumoto, Masaaki*; Matsunaga, Yoko*

no journal, , 

In order to grasp efficiency of risk information, we tried to apply an insight of PRA to considering of severe accidents; TMI, Chernobyl, and Fukushima Dai-ichi. Based on this analysis, three points are disclosed. At first, PRA can product adequate countermeasures for low-likelihood events; huge earthquake or Tsunami. Next, PRA can prove weak points in design or operation reasonably. Third point is safety culture. PRA and safety culture are seemed to be connected deeply. These analyses revealed PRA is one of the most efficient and systematic risk analysis methods to prevent/mitigate severe accidents.

Oral presentation

For discussions with the public for the safety of nuclear power; Various patterns of risk application method and examples

Narumiya, Yoshiyuki*; Miyano, Hiroshi*; Noguchi, Kazuhiko*; Muramatsu, Ken*; Takata, Takashi; Muta, Hitoshi*; Itoi, Tatsuya*; Matsumoto, Masaaki*; Matsunaga, Yoko*

no journal, , 

Target of PRA is not calculating PRA to get CDF/CFF, but providing significant and useful information from PRA results for risk-informed activities. Lot of risk applications have been implemented these about 20 years in US. After Fukushima Dai-ichi accidents, Japanese Nuclear Regulation Authority provided new regulatory requirements about external events and beyond design events. And Risk Application faces full-scale implementation. In this report, several methods of risk application are showed with adequate risk indexes. Two examples of risk application, risk-informed shutdown management and RI-ISI, are provided. The explanation about Risk Informed Decision-Making Process is made.

Oral presentation

Significance and overview of basic safety principles on earthquake engineering for nuclear power plants, 2; Overview of basic safety principles on earthquake engineering for NPP

Takata, Takashi; Takada, Tsuyoshi*; Narumiya, Yoshiyuki*; Kamiya, Masanobu*; Jimbo, Masakazu*; Muta, Hitoshi*; Hayashi, Kentaro*

no journal, , 

Since earthquake surely takes place in Japan, safety on nuclear power plant (NPP) against earthquake is one of the most important issue. In April 2016, a research council of "Basic Safety Principles on Earthquake Engineering for Nuclear Power Plants" was established in Japan Association for Earthquake Engineering (JAEE) to clarify a basic concept and a practice of the safety principles among a mature discussion by engineers in a wide range of nuclear safety and earthquake engineering fields. In the present report, the summery of the basic safety principles is introduced and a sufficient exchange of views will be conducted through the session.

Oral presentation

Significance and overview of basic safety principles on earthquake engineering for nuclear power plants, 2; Overview of basic safety principles on earthquake engineering for NPP

Takata, Takashi; Takada, Tsuyoshi*; Narumiya, Yoshiyuki*

no journal, , 

The research committee on "Basic Safety Principles on Earthquake Engineering" was established in Japan Association for Earthquake Engineering (JAEE) to propose the basic safety principles on earthquake engineering for nuclear power plants (NPPs) based on defense in depth and also risk concept. In the committee, three working groups were also established. In working group 1 (WG1), which was parallel established as a subcommittee of "Basic Safety Principles on Earthquake Engineering" in Atomic Energy Society of Japan (AESJ), the contents of the basic safety principles on earthquake engineering has been discussed and the material for discussion has been summarized. This paper summarizes the basic principles and points of contention through the discussion.

Oral presentation

Significance and overview of basic safety principles on earthquake engineering for nuclear power plants, 2; Overview of basic safety principles on earthquake engineering for NPP

Takata, Takashi; Takada, Tsuyoshi*; Narumiya, Yoshiyuki*; Kamiya, Masanobu*; Jimbo, Masakazu*; Muta, Hitoshi*; Hayashi, Kentaro*

no journal, , 

The research committee on "Basic Safety Principles on Earthquake Engineering" was established in Japan Association for Earthquake Engineering (JAEE) to propose the basic safety principles on earthquake engineering for nuclear power plants (NPPs) based on defense in depth and also risk concept. In the committee, three working groups were also established. In working group 1 (WG1), which was parallel established as a subcommittee of "Basic Safety Principles on Earthquake Engineering" in Atomic Energy Society of Japan (AESJ), the contents of the basic safety principles on earthquake engineering has been discussed and the material for discussion has been summarized. This paper summarizes the basic principles and points of contention through the discussion.

Oral presentation

Proposal of basic principles on seismic safety of nuclear power plants

Takata, Takashi; Takada, Tsuyoshi*; Narumiya, Yoshiyuki*

no journal, , 

The research committee on "Basic Safety Principles on Earthquake Engineering" was established in Japan Association for Earthquake Engineering (JAEE) to propose the basic principles on seismic safety of nuclear power plants (NPPs) based on defense in depth and also risk concept. In the committee, three working groups were also established. In working group 1 (WG1), which was parallel established as a subcommittee of "Basic Safety Principles on Earthquake Engineering" in Atomic Energy Society of Japan (AESJ), the contents of the basic principles have been discussed and proposed.

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