Consideration of radiolytic behavior in diluted and concentrated systems of seawater for computational simulation of hydrogen generation

Nagaishi, Ryuji; Inoue, Masao; Hino, Ryutaro; Ogawa, Toru

Proceedings of 2014 Nuclear Plant Chemistry Conference (NPC 2014) (USB Flash Drive), 9 Pages, 2014/10

Since seawater has been used as a coolant for reactors and spent fuel pools in broken reactor buildings at Fukushima Daiichi NPS accident, radioactive contaminated water emitted following the accident has contained salt content of seawater at high concentrations, different from that at TMI-2 accident. Radiolysis of seawater leading to hydrogen generation and corrosion has been simulated and reported by several groups. However, the proposed radiolysis models cannot be always applied to water radiolysis at the wide range of salt concentrations present in the NPS, mainly because primary yields of radiolysis products of water and radiation-induced reactions are dependent on the salt concentration. In this study, the radiolytic behavior in diluted and concentrated systems of seawater was considered on the basis of results in steady state and pulse radiolysis experiments, in which the above salt effects were demonstrated from the obtained results.

Study on radiation induced reactions in groundwater

Katsumura, Yosuke*; Ishigure, Kenkichi *

PNC TJ1602 95-003, 172 Pages, 1995/02

PNC-TJ1602-95-003.pdf:4.64MB

In order to keep the integrity of the repository of the radioactive high level waste, it is inevitably important to grasp and clarify the chemical conditions of the groundwater and it is highly required to evaluate the radiation induced chemical effect in groundwater. In the present report, a database has been constructed from the literatures in the field of radiation chemistry published up to now, as a first step of the evaluation of the radiation induced chemical reactions and their rate constants in aqueous solutions containing chemical species, which are normally present in groundwater. On the basis of the database, simulations for several typical aqueous solutions have been carried out, and both further reactions to be investigated and additional experiments to be done in future have been pointed out. It is concluded that experimental data is highly expected to be accumulated and compared with simulation.

Pre-equilibrium process in He-induced reactions on Co, Ag, Ta and Bi

Nagame, Yuichiro; *; *; *; Nakahara, Hiromichi*

Nuclear Physics A, 486, p.77 - 90, 1988/00

https://doi.org/10.1016/0375-9474(88)90040-1

no abstracts in English

Reaction of Nuclear Graphite with Oxygen under Gamma-Ray Irradiation

; ; ; ;

JAERI-M 8848, 21 Pages, 1980/05

JAERI-M-8848.pdf:2.61MB

no abstracts in English