Investigations and consideration on contamination inspection and decontamination criteria at a nuclear emergency

Togawa, Orihiko; Hokama, Tomonori; Hiraoka, Hirokazu; Saito, Shota

JAEA-Research 2023-011, 78 Pages, 2024/03

JAEA-Research-2023-011.pdf:2.09MB

When radionuclides are released into the atmospheric environment at a nuclear emergency, protective measures such as evacuation and temporal relocation are carried out using motor vehicles such as private cars and buses to reduce radiation exposure to residents. To confirm conditions of contamination for the evacuated/relocated residents and the used motor vehicles, contamination inspection is conducted in the middle of the route from border areas of Nuclear Emergency Planning Zone to evacuation shelters. In the present inspection in Japan, a value of OIL4 = 40,000 cpm is used as decontamination criteria. For the details and derivation methods of the value, however, no official documents are found which give systematically detailed descriptions and explanation. It is also recognized that even few experts on nuclear emergencies can explain these subjects in detail as a whole. In order to explain scientifically and technically the OIL4 value of decontamination criteria used in contamination inspection in Japan, this report aims at investigating and estimating the deviation methods of OIL4, and examining and considering these results. To achieve the objectives, we show the bases for decontamination criteria, and investigate and estimate the derivation methods for limits of a surface contamination density corresponding to the generic criteria for each exposure pathway. Moreover, we give the OIL4 value some consideration and suggestions from a viewpoint of positioning and feature of OIL4 in Japan, and cautionary points at revising the value.

ITER physics basis, 3; MHD stability, disruptional limits and disruptions

ITER Physics Expert Group on Disruptions, Plasma Control, and MHD

Nuclear Fusion, 39(12), p.2251 - 2389, 1999/00

https://doi.org/10.1088/0029-5515/39/12/303

no abstracts in English

Disruption amelioration experiments in JT-60U and JET

Yoshino, Ryuji; Neyatani, Yuzuru; Isei, Nobuaki; Koide, Yoshihiko; Kawano, Yasunori; A.Tanga*; Campbell, D. J.*; M.F.Johnson*; L.Rossi*

IAEA-CN-60/A5-8, 0, p.685 - 695, 1995/00

no abstracts in English

Softening of Current quenches in JT-60U

Yoshino, Ryuji; Neyatani, Yuzuru; Hosogane, Nobuyuki; S.W.Wolfe*; Matsukawa, Makoto; Ninomiya, Hiromasa

Nuclear Fusion, 33(11), p.1599 - 1612, 1993/00

https://doi.org/10.1088/0029-5515/33/11/I02

no abstracts in English

Operational limits and disruptions in tokamaks; Status and application to ITER

Tsunematsu, Toshihide; J.Hogan*; K.Borrass*; F.Engelmann*;

JAERI-M 89-056, 47 Pages, 1989/05

JAERI-M-89-056.pdf:1.25MB

no abstracts in English

Japanese Contributions to IAEA INTOR Workshop,Phase Two A,Part 2 Chapter VIII:Physics

Takeda, Tatsuoki; ; ; ; ; *; ; *; ;

JAERI-M 85-080, 70 Pages, 1985/07

JAERI-M-85-080.pdf:2.42MB

no abstracts in English