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Product Abstract

Fukushima Daiichi Accident -- Technical Causal Factor Analysis

Product ID:1024946
Date Published:27-Mar-2012
Implementation Category:

Foundational building blocks for product research and development, often including scientific findings and field experience that feed into Category 1 or Category 2 recommendations.

View all implementation categories and type descriptionsAdobe Portable Document Format

Sector Name:Nuclear
Document Type:Technical Results
Implementation Type:

Basic/early phase of R&D findings (3-5 yr outlook)

View all implementation categories and type descriptionsAdobe Portable Document Format

Price:No Charge

This Product is publicly available

   3.48 MB - Adobe PDF (.pdf)

On March 11, 2011, the Fukushima Daiichi nuclear power plant experienced a seismic event and subsequent tsunami. The accident and the ensuing mitigation and recovery activities occurred over several days, involved a number of incidents, and might provide several opportunities for lessons learned. The objective of this report is to determine the fundamental causative factors for the loss of critical systems at the Fukushima Daiichi reactors that resulted in core damage and subsequent radioactive release. The analytical approach used structured event information to support the identification of causal factors; this information can be used in root cause analysis and corrective action determinations.

The technical analysis traced the cause for the eventual loss of all practical cooling paths for the reactors to the tsunami's flooding of the plant protection. Specifically, the analysis identified the significant difference between the design basis tsunami height and the actual tsunami height, as well as the limitations of beyond-design-basis tsunami protection or mitigation that could address the effects of the actual event. From a causal analysis perspective, these were caused by a methodology that specified that the rupture of combinations of geological fault segments in the vicinity of the plant need not be considered in establishing the design basis tsunami height. The tsunami that occurred was caused by a combined rupture of multiple fault segments.

2012 Program 41.07.01   Risk and Safety Management Program
  • Earthquake
  • Fukushima Daiichi
  • Tsunami

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