Development of the source term PIRT based on findings during Fukushima Daiichi NPPs accident

•We developed the source term PIRT based on findings during the Fukushima accident.•The FoM is the masses or fractions of radionuclides released into the environment.•68 phenomena were identified as influencing to the FoM.•Radionuclide release from molten fuel had the highest score in the early phas...

Full description

Saved in:
Bibliographic Details
Published in:Nuclear engineering and design 2015-05, Vol.286, p.163-174
Main Authors: Suehiro, Shoichi, Sugimoto, Jun, Hidaka, Akihide, Okada, Hidetoshi, Mizokami, Shinya, Okamoto, Koji
Format: Article
Language:English
Subjects:
Accidents
Categories
Hydraulics
Lists
Mathematical analysis
Nuclear accidents
Nuclear reactor components
Phases
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•We developed the source term PIRT based on findings during the Fukushima accident.•The FoM is the masses or fractions of radionuclides released into the environment.•68 phenomena were identified as influencing to the FoM.•Radionuclide release from molten fuel had the highest score in the early phase.•MCCI, iodine chemistry, and chemical form had the highest score in the later phase. Research Expert Committee on Evaluation of Severe Accident of AESJ (Atomic Energy Society of Japan) has developed thermal hydraulic PIRT (Phenomena Identification and Ranking Table) and source term (ST) PIRT based on findings during the Fukushima Daiichi NPPs accident. These PIRTs aim to explore the debris distribution and the current condition in the NPPs with high accuracy and to extract higher priority from the aspect of the sophistication of the analytical technology to predict the severe accident phenomena by the analytical codes. The ST PIRT is divided into 3 phases for time domain and 9 categories for spatial domain. The 68 phenomena have been extracted and the importance from the viewpoint of the source term has been ranked through brainstorming and discussions among experts. The present paper describes the developed ST PIRT list and summarizes the high ranked phenomena in each phase.
ISSN:0029-5493
1872-759X
DOI:10.1016/j.nucengdes.2015.02.005