The Activity of sulfate reducing bacteria in bentonite and the effect of hydrogen sulfide on the corrosion of candidate materials for overpacks

Taniguchi, Naoki; Kawasaki, Manabu*; Fujiwara, Kazuo*

JNC TN8400 2001-011, 62 Pages, 2001/03

JNC-TN8400-2001-011.pdf:5.67MB

The corrosion of metallic materials used in natural environment are sometimes affected by microbial action. It is apprehended that microorganism living in deep underground or brought from ground surface during excavation makes an impact on overpack material for geological disposal of high-level radioactive waste. Sulfate reducing bacteria (SRB) is known to be one of the most representative microorganism which affects the corrosion of metals. In this study, the behavior of growth of SRB was investigated at first under the presence of bentonite as a main component of buffer material which encloses the overpack. The results of the tests showed that the population of SRB after the culture in synthetic sea water mixed with bentonite decreased with increasing the ratio of bentonite/solution. SRB was hardly grown in medium whose bentonite/solution ratio exceeded 1000g/l. As a conservative case, the effects of sulfide on the corrosion of overpack materials were also studied assuming high activity of SRB. Carbon steel, copper and titanium specimens were immersed in synthetic sea water purging 0.1MPa HS gas and the corrosion behavior was compared with the results in N gas purging environment. Obvious effect of sulfide on the corrosion of carbon steel was not observed, but the corrosion rates of copper specimens were accelerated several hundred times by purging HS gas. The absorption of hydrogen into titanium specimens was not affected by purging HS gas, but the difference of hydrogen absorption between pure titanium and titanium alloy containing 0.06%-Pd was observed.

None

*

JNC TJ7420 2000-001, 14 Pages, 2000/02

JNC-TJ7420-2000-001.pdf:0.27MB

no abstracts in English

None

PNC TJ1533 98-003, 105 Pages, 1998/02

PNC-TJ1533-98-003.pdf:3.51MB

no abstracts in English

None

*; Fukazawa, E.*; Horita, M.*; Kubota, Shigeru*

PNC TJ1449 97-005, 207 Pages, 1997/03

PNC-TJ1449-97-005.pdf:8.5MB

None

None

PNC TJ1533 96-005, 199 Pages, 1996/03

PNC-TJ1533-96-005.pdf:7.37MB

no abstracts in English

Comparison of the degradability of irradiated polypropylene and poly(propylene-co-ethylene) in the natural environment

G.Meligi*; Yoshii, Fumio; Sasaki, T.; Makuuchi, Keizo; A.M.Rabie*; *

Polym. Degrad. Stab., 49, p.323 - 327, 1995/00

https://doi.org/10.1016/0141-3910(95)87015-6

no abstracts in English

None

Matsumoto, Shiro*

PNC TJ1533 94-002, 217 Pages, 1994/03

PNC-TJ1533-94-002.pdf:7.96MB

no abstracts in English

The Characteristic of radiation field in living environment, II; The distribution of absorbed dose in air on train lines with in Tokyo metropolitan areas

Nagaoka, Toshi; Sakamoto, Ryuichi; Tsutsumi, Masahiro; Saito, Kimiaki; Moriuchi, Shigeru

Nihon Genshiryoku Gakkai-Shi, 32(5), p.507 - 513, 1990/05

https://doi.org/10.3327/jaesj.32.507

no abstracts in English