Decommissioning state of Plutonium Fuel Fabrication Facility; Dismantling the glove box W-9 and equipment interior, and a part of tunnel F1

Nagai, Yuya; Shuji, Yoshiyuki; Kawasaki, Takeshi; Aita, Takahiro; Kimura, Yasuhisa; Nemoto, Yasunori*; Onuma, Takeshi*; Tomiyama, Noboru*; Hirano, Koji*; Usui, Yasuhiro*; et al.

JAEA-Technology 2022-039, 117 Pages, 2023/06

JAEA-Technology-2022-039.pdf:11.96MB

Japan Atomic Energy Agency (JAEA) manages wide range of nuclear facilities. Many of these facilities are required to be performed adjustment with the aging and complement with the new regulatory standards and the earthquake resistant, since the Great East Japan Earthquake and the Fukushima Daiichi Nuclear Power Station accident. It is therefore desirable to promote decommissioning of facilities that have reached the end of their productive life in order to reduce risk and maintenance costs. However, the progress of facility decommissioning require large amount of money and radioactive waste storage space. In order to address these issues, JAEA has formulated a "The Medium/Long-Term Management Plan of JAEA Facilities" with three pillars: (1) consolidation and prioritization of facilities, (2) assurance of facility safety, and (3) back-end countermeasures. In this plan, Plutonium Fuel Fabrication Facility has been selected as primary decommissioned facility, and dismantling of equipment in the facilities have been underway. In this report, size reduction activities of the glove box W-9 and a part of tunnel F-1, which was connected to W-9, are presented, and the obtained findings are highlighted. The glovebox W-9 had oxidation & reduction furnace, and pellet crushing machine as equipment interior. The duration of activity took six years from February 2014 to February 2020, including suspended period of 4 years due to the enhanced authorization approval process

Negative magnetoresistance of pyrolytic carbon and effects of low-temperature electron irradiation

Iwase, Akihiro; Ishikawa, Norito; Iwata, Tadao*; Chimi, Yasuhiro; Nihira, Takeshi*

Physical Review B, 60(15), p.10811 - 10819, 1999/00

https://doi.org/10.1103/PhysRevB.60.10811

no abstracts in English

Defect production by electron excitation in Cu and Ag

Iwase, Akihiro; Iwata, Tadao; Nihira, Takeshi*

Journal of the Physical Society of Japan, 61(11), p.3878 - 3882, 1992/11

https://doi.org/10.1143/JPSJ.61.3878

no abstracts in English

Defect recovery in FCC metals irradiated with 0.5 - 126 MeV energetic ions

Iwase, Akihiro; Iwata, Tadao; Nihira, Takeshi*; Sasaki, Shigemi

Mater. Sci. Forum, 97-99, p.605 - 614, 1992/00

no abstracts in English

Effect of 120 MeV oxygen ion irradiation on current-voltage characteristics in YBaCuO

Iwase, Akihiro; ; Iwata, Tadao; Nihira, Takeshi*

Mat. Res. Soc. Symp. Proc., Vol. 209, p.847 - 851, 1991/00

no abstracts in English

Effect of high-energy ion irradiation on current-voltage characteristics in the oxide superconductor YBaCuO

Iwase, Akihiro; ; Iwata, Tadao; Nihira, Takeshi*

Japanese Journal of Applied Physics, 29(10), p.L1810 - L1812, 1990/10

https://doi.org/10.1143/JJAP.29.L1810

no abstracts in English

Effect of 120 MeV O ion irradiation at liquid nitrogen temperature on superconducting properties of Bi-Pb-Sr-Ca-Cu-O

Iwase, Akihiro; Watanabe, Mitsuo; Iwata, Tadao; Nihira, Takeshi*

Japanese Journal of Applied Physics, 28(11), p.L1939 - L1941, 1989/11

https://doi.org/10.1143/JJAP.28.L1939

no abstracts in English

Defect production and defect saturation behavior in nickel irradiated with heavy ions in the energy range 84102 MeV

Iwase, Akihiro; Sasaki, Shigemi; Iwata, Tadao; Nihira, Takeshi*

Journal of Nuclear Materials, 155-157, p.1188 - 1191, 1988/00

https://doi.org/10.1016/0022-3115(88)90493-X

no abstracts in English

Defect production and recovery in nickel irradiated with energetic ions

; ; ; *

Journal of Nuclear Materials, 141-143, p.786 - 789, 1986/00

https://doi.org/10.1016/0022-3115(86)90093-0

no abstracts in English

Thermal conductivity of irradiated graphite

*;

Point Defects and Defect Interactions in Metals, p.236 - 238, 1982/00

no abstracts in English