Crud behaviors in high-temperature water, (I). Characterization of water in JMTR OWL-1 loop.

Hoshi, Michio; Tachikawa, Enzo; Suwa, Takeshi; Sagawa, Chiaki; Yonezawa, Chushiro; Aoyama, Isao; Yamamoto, Katsumune

doi:10.3327/jnst.23.511

Cited by 2 publications

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“…As a result of this process and subsequent hydrolysis, iron oxide/hydroxide particles are formed in the condensation water [1,2]. Such particles, generally called "crud", have a mixed chemical composition, which is mainly represented by iron and, to a lesser extent, chromium, nickel, cobalt, and zinc [3,4]. Crud particles tend to adsorb short-lived radionuclides of the corrosion group [3], which leads to the risk of receiving increased dose loads for maintenance personnel.…”

Section: Introductionmentioning

confidence: 99%

“…Such particles, generally called "crud", have a mixed chemical composition, which is mainly represented by iron and, to a lesser extent, chromium, nickel, cobalt, and zinc [3,4]. Crud particles tend to adsorb short-lived radionuclides of the corrosion group [3], which leads to the risk of receiving increased dose loads for maintenance personnel. The crud is removed from the NPP system water by means of mechanical filtration on columns with ion-exchange resins, followed by reverse washing.…”

Section: Introductionmentioning

confidence: 99%

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Electro-Decontamination of Spent Ion Exchange Resins Contaminated with Iron Oxide Deposits under Dynamic Conditions

2021

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A method for the electro-decontamination of spent ion exchange resin contaminated with hematite under dynamic conditions using sulfuric acid solutions has been suggested. It has been shown that decontamination under dynamic conditions excludes the secondary adsorption of radionuclides on ion-exchanger sites. The efficiency of this approach has been compared to that of control experiments without direct current treatment. A positive effect of the introduction of Fe2+ on the rate of dissolution of hematite has been demonstrated. This allows for decreasing the concentration of the sulfuric acid solution without decreasing the decontamination efficiency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electro-Decontamination of Spent Ion Exchange Resins Contaminated with Iron Oxide Deposits under Dynamic Conditions

2021

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Crud behaviors in high-temperature water. (III) Chemical form of cobalt-60 in JMTR OWL-1 loop water.

Hoshi¹,

Tachikawa²,

Yonezawa³

et al. 1986

J. Nucl. Sci. Technol.

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Solvent extraction of Co with diethyldithiocarbamate (DDC) has been applied to the determination of the chemical state of Co in OWL-1 loop water installed in JMTR. The 75-93%of the ''soluble'' 'j0Co are in a form to be easily extracted, C O ( I I )~+ ,and 5-22% are in a form being transformed to an extractable form a t pH 5.5. T h e rest, a few percent, is in non-extractable state, possibly in a fine particle. These results are consistent with the general concept that majority of W o in "soluble" fraction is in a state of C O ( I I )~+ in the primary coolant of nuclear reactor. It is also noticed that in contact with air in alkaline media a slow oxidation of Co (II) (OH) to Co (HI) (OH) a tends to occur a t an apparent oxidation rate ofThis oxidation leads to the decrease of the extractability.

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Crud behaviors in high-temperature water, (I). Characterization of water in JMTR OWL-1 loop.

Cited by 2 publications

References 1 publication

Electro-Decontamination of Spent Ion Exchange Resins Contaminated with Iron Oxide Deposits under Dynamic Conditions

Electro-Decontamination of Spent Ion Exchange Resins Contaminated with Iron Oxide Deposits under Dynamic Conditions

Crud behaviors in high-temperature water. (III) Chemical form of cobalt-60 in JMTR OWL-1 loop water.

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