Study on improving safety by applying Safety-II concept based on accident responding analysis for Fukushima Daiichi Nuclear Power Plant

Yoshizawa, Atsufumi*; Oba, Kyoko; Kitamura, Masaharu*

Ningen Kogaku, 54(1), p.1 - 13, 2018/02

AA2017-0637.pdf:1.46MB

The two approaches as the concepts to ensure safety of the complicated socio-technical systems have been proposed by Hollnagel. They are the safety concepts called "Safety-I" to reduce risks and "Safety-II" to expand successes. The resilience engineering is suggested as the methodology to achieve Safety-II. The study analyzes the recovery of the water injection of Unit 3 based on the resilience engineering, focusing on the fact that preventing further progress of the accident case in Fukushima Daiichi Nuclear Power Plant which has been evaluated for extracting risk factors. Based on those results, the study has clarified the method of learning to enhance safety which has a different view from existing accident investigation.

Enhancement of organizational resilience in light of the Fukushima Dai-ichi Nuclear Power Plant accident, 4; Consideration of nurturing attitude to achieve the safety-II

Oba, Kyoko; Yoshizawa, Atsufumi*; Kitamura, Masaharu*

no journal, , 

no abstracts in English

Lessons learned from good practices during the accident at Fukushima Daiichi Nuclear Power Station in light of resilience engineering

Yoshizawa, Atsufumi*; Oba, Kyoko; Kitamura, Masaharu*

no journal, , 

The accident at the Fukushima Daiichi Nuclear Power Station, which was triggered by the Great East Japan Earthquake, has presented significant issues about in which the safety of massive socio-technical systems is structured. We must derive the greatest number of lessons possible from this accident to ensure the safety of systems in the future, but the lessons learned so far have mainly focused on risks and been deduced from an analysis of failures that led to the accident. This paper references the approach of Resilience Engineering which aims to extend successes in a changing environment, and focuses on the actions that prevented "further catastrophe" through an analysis of the Fukushima accident and derives new lessons to improve the capability to handle "unforeseen contingencies."