|The Institute of Nuclear Power Operations (INPO) prepared a report that provides a narrative overview and timeline for the earthquake, tsunami, and subsequent damage to the Tokyo Electric Power Company (TEPCO) Fukushima Daiichi Nuclear Power Station on March 11, 2011. The purpose of this report is to provide an accurate, consolidated source of information regarding the sequence of events that occurred in the first days of the accident. The information contained in this report may be used for determining future U.S. and international industry corrective actions.|
Although INPO describes certain events and actions taken, those descriptions are not, at this time, intended to reflect any analysis or assessment of the decisions made by any individual or entity. This report does not assess or analyze the effectiveness of plant workers or others involved in response to the event.
This report reflects the best available information, most of which was obtained from direct and ongoing interaction with TEPCO personnel. It focuses on the first days of the event for Reactors 1, 2, and 3 and includes some information on Reactors 4, 5, and 6 as well as the spent fuel pools. Because of the extensive damage at the site, some details of the event remain unknown or have not been confirmed.
TEPCO personnel have reviewed the content of this report for accuracy, based on their current understanding of the event. Furthermore, TEPCO assisted in developing the unit specific timelines, provided in Section 8.0, as well as the design basis information in sections 7.1 and 7.2.
TEPCO openly shared information with INPO, responded to questions in a timely manner, and provided resources when available to support the generation of this report. The utility is working to share the facts of this event with the industry and with the Japanese public. This report is based on information available to INPO as of November 1, 2011. INPO has verified as much information as possible.
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