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The article states:

As the Fukushima I nuclear accidents showed, external threats — such as earthquakes, tsunamis, fires, flooding, tornadoes and terrorist attacks — are some of the greatest risk factors for a serious nuclear accident. Yet, nuclear plant operators have normally considered these 'beyond design basis events' so unlikely that they have not built in complete safeguards.[30]

Two issues with this passage. First, the first sentence is a plagiarized direct quote from the source, and the second sentence is an incorrect paraphrase of the source.

Design Basis Events (DBEs) are a set of conditions that a structure is expected to survive (and in the case of a nuclear power plant, prevent a release of nuclear material). For example, a nuclear plant built on a fault line might have a DBE that expects it to withstand a 9.0 magnitude earthquake, while a nuclear plant built on a coastline might have as a DBE to withstand hurricane force winds and rainfall. The events at Fukushima exceeded the design basis for the plant (the plant was designed for a 5.7m tsunami and was hit by a 13-14m tsunami and then by an earthquake that exceeded the design basis ground acceleration by about 1m/s^2).

The way the article is phrased now, it makes it sound like nuclear plant operators don't plan for earthquakes, tsunamis, fires, flooding, tornadoes, or terrorist attacks. The exact opposite is true- they do plan for them, but they use available data to determine exactly what to plan for- Do they build a nuclear plant to withstand a 9.0 magnitude earthquake, or a 6.0 magnitude earthquake? Do they plan for a 14m tsunami, or a 6m tsunami? The point of the article is not that plant operators don't account for these external events, the point is that since Fukushima they're re-evaluating their circumstances to ensure that their DBE's are in fact adequate for their situations.

Given that, and given the plagiarism, I am editing this immediately to read: The Fukushima I nuclear accident was caused by a "beyond design basis event," the tsunami and associated earthquakes were more powerful than the plant was designed to accomodate, and the accident is directly due to the tsunami overflowing the too-low seawall. Since then, the possibility of unforeseen beyond design basis events has been a major concern for plant operators. 128.252.20.193 (talk) 22:30, 13 February 2013 (UTC)[reply]

No, the accident was not "directly due to the tsunami overflowing the too-low seawall". The disaster involved a complex interaction of factors, see Fukushima Daiichi nuclear disaster#Cascade of failures and Normal accidents. Johnfos (talk) 06:44, 25 March 2013 (UTC)[reply]

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This article was the subject of a Wiki Education Foundation-supported course assignment, between 20 August 2024 and 3 December 2024. Further details are available on the course page. Student editor(s): Jrpossan, E102Group11 (article contribs). Peer reviewers: Team12E102F.

— Assignment last updated by Jrpossan (talk) 15:57, 26 October 2024 (UTC)[reply]