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Title: U.S. Efforts in Support of Examinations at Fukushima Daiichi - 2019 Evaluations

Abstract

Much is still not known about the end-state of core materials in each unit that was operating on March 11, 2011 at the Fukushima Daiichi Nuclear Power Station (Daiichi). Information obtained from Daiichi is required to inform Decontamination and Decommissioning (D&D) activities, improving the ability of the Tokyo Electric Power Company Holdings, Incorporated (TEPCO Holdings) to characterize potential hazards and to ensure the safety of workers involved with cleanup activities. This document, which has been updated to include Fiscal Year 2019 (FY2019) information, summarizes results from a U.S. effort to review Daiichi information and extract insights to enhance the safety of existing and future nuclear power plant designs. This U.S. effort, which was initiated in 2014 by the Department of Energy Office of Nuclear Energy (DOE-NE), is completed by a group of experts in reactor safety and plant operations that identify examination needs and evaluate recent Daiichi examination data to address these needs. Each year, annual reports are issued that document significant safety insights being obtained in areas of special emphasis. For FY2019, the areas emphasized by the expert panel include component performance, radionuclide surveys and sampling, debris end-state location, combustible gas effects, and plant operations and maintenance. In additionmore » to reducing uncertainties related to severe accident modeling progression, these insights have and continue to be used to update guidance for severe accident prevention, mitigation, and emergency planning. Reduced uncertainties in modeling the events at Daiichi improve the realism of reactor safety evaluations that inform future D&D activities. In addition, the process established by this U.S. effort provides an example that Japan may wish to implement in future international efforts to support D&D. As emphasized in this FY2019 report, important insights are being gained from examinations of the affected units at Daiichi. Although many results from prior years have been moved to appendices, key areas of interest are highlighted in the main document. For example, larger intact components and fuel containing materials observed on the floor of the primary containment and retained on ex-vessel structures continue to be emphasized because of insights that may be gained with respect to vessel failure and ex-vessel interactions with structures and concrete. In addition, the main report presents insights gained by focused evaluations of plant data because of potential use of systems and components during severe accident conditions and alternate perspectives regarding accident progression that may be inferred from such data. The report also illustrates how systems analysis codes can be applied to reduce uncertainties about the progression of events at Daiichi and how practical insights obtained from Daiichi can be used to enhance radiation safety for the existing fleet. Recent and planned updates to systems analysis codes are also discussed. As in prior years, this report contains an appendix with a list of examination needs that was updated after U.S. experts reviewed recently obtained information from Daiichi. Additional details for higher priority, near-term, examination activities are also provided. This report also includes an appendix with a description of a website that was developed to assist U.S. experts by providing information in an archived retrievable location.« less

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Electric Power Research Institute (EPRI); Exelon Generation; GE Hitachi Nuclear Energy (GEH); Fauske and Associates; Framatome; Jensen Hughes; Westinghouse Electric Company; USDOE Office of Nuclear Energy
OSTI Identifier:
1561221
Report Number(s):
ANL-19/08
154944
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Amway, P., Andrews, N., Basu, S., Bunt, R., Butler, J., Ellison, P., Farmer, M., Gabor, J., Gauntt, R., Henry, C., Honda, T., Humrickhouse, P., Klass, K., Kobayashi, T., Kraft, S., Linthicum, R., Luangdilok, W., Lutz, R., Luxat, D., Mizokami, S., Nakayoshi, A., Osborn, D., Paik, C., Plys, M., Rempe, J., Robb, K., Sanders, R., Shearer, K., Wachowiak, R., Washiya, T., Whiteman, P., and Williamson, B. U.S. Efforts in Support of Examinations at Fukushima Daiichi - 2019 Evaluations. United States: N. p., 2019. Web. doi:10.2172/1561221.
Amway, P., Andrews, N., Basu, S., Bunt, R., Butler, J., Ellison, P., Farmer, M., Gabor, J., Gauntt, R., Henry, C., Honda, T., Humrickhouse, P., Klass, K., Kobayashi, T., Kraft, S., Linthicum, R., Luangdilok, W., Lutz, R., Luxat, D., Mizokami, S., Nakayoshi, A., Osborn, D., Paik, C., Plys, M., Rempe, J., Robb, K., Sanders, R., Shearer, K., Wachowiak, R., Washiya, T., Whiteman, P., & Williamson, B. U.S. Efforts in Support of Examinations at Fukushima Daiichi - 2019 Evaluations. United States. doi:10.2172/1561221.
Amway, P., Andrews, N., Basu, S., Bunt, R., Butler, J., Ellison, P., Farmer, M., Gabor, J., Gauntt, R., Henry, C., Honda, T., Humrickhouse, P., Klass, K., Kobayashi, T., Kraft, S., Linthicum, R., Luangdilok, W., Lutz, R., Luxat, D., Mizokami, S., Nakayoshi, A., Osborn, D., Paik, C., Plys, M., Rempe, J., Robb, K., Sanders, R., Shearer, K., Wachowiak, R., Washiya, T., Whiteman, P., and Williamson, B. Tue . "U.S. Efforts in Support of Examinations at Fukushima Daiichi - 2019 Evaluations". United States. doi:10.2172/1561221. https://www.osti.gov/servlets/purl/1561221.
@article{osti_1561221,
title = {U.S. Efforts in Support of Examinations at Fukushima Daiichi - 2019 Evaluations},
author = {Amway, P. and Andrews, N. and Basu, S. and Bunt, R. and Butler, J. and Ellison, P. and Farmer, M. and Gabor, J. and Gauntt, R. and Henry, C. and Honda, T. and Humrickhouse, P. and Klass, K. and Kobayashi, T. and Kraft, S. and Linthicum, R. and Luangdilok, W. and Lutz, R. and Luxat, D. and Mizokami, S. and Nakayoshi, A. and Osborn, D. and Paik, C. and Plys, M. and Rempe, J. and Robb, K. and Sanders, R. and Shearer, K. and Wachowiak, R. and Washiya, T. and Whiteman, P. and Williamson, B.},
abstractNote = {Much is still not known about the end-state of core materials in each unit that was operating on March 11, 2011 at the Fukushima Daiichi Nuclear Power Station (Daiichi). Information obtained from Daiichi is required to inform Decontamination and Decommissioning (D&D) activities, improving the ability of the Tokyo Electric Power Company Holdings, Incorporated (TEPCO Holdings) to characterize potential hazards and to ensure the safety of workers involved with cleanup activities. This document, which has been updated to include Fiscal Year 2019 (FY2019) information, summarizes results from a U.S. effort to review Daiichi information and extract insights to enhance the safety of existing and future nuclear power plant designs. This U.S. effort, which was initiated in 2014 by the Department of Energy Office of Nuclear Energy (DOE-NE), is completed by a group of experts in reactor safety and plant operations that identify examination needs and evaluate recent Daiichi examination data to address these needs. Each year, annual reports are issued that document significant safety insights being obtained in areas of special emphasis. For FY2019, the areas emphasized by the expert panel include component performance, radionuclide surveys and sampling, debris end-state location, combustible gas effects, and plant operations and maintenance. In addition to reducing uncertainties related to severe accident modeling progression, these insights have and continue to be used to update guidance for severe accident prevention, mitigation, and emergency planning. Reduced uncertainties in modeling the events at Daiichi improve the realism of reactor safety evaluations that inform future D&D activities. In addition, the process established by this U.S. effort provides an example that Japan may wish to implement in future international efforts to support D&D. As emphasized in this FY2019 report, important insights are being gained from examinations of the affected units at Daiichi. Although many results from prior years have been moved to appendices, key areas of interest are highlighted in the main document. For example, larger intact components and fuel containing materials observed on the floor of the primary containment and retained on ex-vessel structures continue to be emphasized because of insights that may be gained with respect to vessel failure and ex-vessel interactions with structures and concrete. In addition, the main report presents insights gained by focused evaluations of plant data because of potential use of systems and components during severe accident conditions and alternate perspectives regarding accident progression that may be inferred from such data. The report also illustrates how systems analysis codes can be applied to reduce uncertainties about the progression of events at Daiichi and how practical insights obtained from Daiichi can be used to enhance radiation safety for the existing fleet. Recent and planned updates to systems analysis codes are also discussed. As in prior years, this report contains an appendix with a list of examination needs that was updated after U.S. experts reviewed recently obtained information from Daiichi. Additional details for higher priority, near-term, examination activities are also provided. This report also includes an appendix with a description of a website that was developed to assist U.S. experts by providing information in an archived retrievable location.},
doi = {10.2172/1561221},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}

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