Gamma Radiation Effects on Time-Dependent Iodine Partitioning

Marshall, P.W.; Lutz, J.B.; Kelly, J.L.

doi:10.13182/nt87-a33925

Cited by 10 publications

(5 citation statements)

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“…This was observed under the majority of the conditions examined. This trend was reasonably consistent with that observed by Marshall (1986) under similar conditions. For example, for a lo--' mol/L NaZ solution of pH 5 , Marshall found that the partition coefficient dropped by a factor of about 20 over the first 100 hours reaching a constant value of 5 x lo4 while for a 2 X mol/L solution of the same pH, he found that the partition coefficient dropped by a factor of ten over 150 hours reaching a constant value of approximately 1.5 X lo3.…”

Section: Resultssupporting

confidence: 92%

“…The rate of thermal iodide oxidation under conditions relevant to reactor accidents is also directly relevant to interpreting measurements by other authors (Marshall, 1986;Kupferschmidt et al 1989) of iodine volatility above dilute iodide solutions in the absence of irradiation. In these experiments, the amount of volatile iodine observed greatly exceeded that consistent with the often cited rate law of Sigalla and Herbo (1957).…”

Section: Resultsmentioning

confidence: 87%

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The volatilization of iodine species over dilute iodide solutions

1993

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The volatility of iodine above dilute CsI solutions has been investigated experimentally. The partitioning of iodine between air and solutions prepared with iodide was found to increase with decreasing pH and iodide concentration. Aqueous to gaseous partition coefficients ranging from 3 X 103 to 107 were observed indicating that only a very small fraction of the iodide was oxidized to volatile forms. It was concluded that under these very dilute conditions, the rate of iodide oxidation was proportional to the square root of the iodide concentration; the rate also depended on pH under acidic conditions but not under basic conditions.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 87%

The volatilization of iodine species over dilute iodide solutions

1993

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“…Volatilities of iodine species, which are generally measured by water-gas partitioning, have been studied by several investigators [40][41][42][43][44][45][46][47][48][49][50][51][52][53] under various conditions. The water-gas partition coefficient (PC) is defined as the ratio of the concentration of an iodine species in water to that in the gas phase.…”

Section: Volatilities Of Iodine Speciesmentioning

confidence: 99%

“…Some studies on the effects of gamma radiation and organic impurities as a function of time have also been reported. [50][51][52] Hydrolyses of iodine species would certainly decrease the concentration of gaseous species and enhances the water-gas partitioning, as shown by the following water hydrolysis equilibrium of I 2 as an example.…”

Section: Volatilities Of Iodine Speciesmentioning

confidence: 99%

Reassessment of Reactor Coolant and Iodine Chemistry under Accident Conditions

Lin

Chao

2009

Journal of Nuclear Science and Technology

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Under severe accident conditions, the chemistry of reactor coolant could be significantly different from that under normal operating conditions. Injection of standby liquid control (SBLC) solution, release of fission product cesium (Cs) from damaged fuel rods, and addition of NaOH and Na 2 S 2 O 3 in spray water will certainly enhance the alkalinity of water. In addition, oxidation of fuel cladding (zircaloy) by hightemperature water and steam would produce a significant amount of hydrogen, and hydrogen in water could effectively suppress water radiolysis and make the water more reducing. It is believed that the chemistry and transport behavior of iodine released from damaged fuel rods are strongly dependent on the chemistry of reactor water under accident conditions, and it is expected that the released iodine will most likely remain in nonvolatile forms in water. The chemistry of reactor coolant and the activities of iodine released from a damaged core are reviewed in detail in this paper.

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“…P I 2 varies from 100 at room temperature to 5 at 150 • C [9][10][11][12][13] and this means that iodine volatility increases with temperature. At 80 • C, P I 2 is about 10.…”

Section: Iodine Behavior During Nuclear Reactor Cold Shutdownmentioning

confidence: 99%

Absorption of iodine from aqueous solutions on nuclear reactors alloys

Bayrı¹,

Rosset²,

Kacemi³

2001

Radiochimica Acta

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Iodide ions I − , molecular iodine I 2 and iodate ions IO 3 − absorption has been studied on the three alloys which are present, in majority, in french nuclear reactors: Inconel 600, Zircaloy and 304 L stainless steel. Iodide and iodate anions are not absorbed on the three considered alloys and contribute only for a negligible quantity to iodine retention on the nuclear reactors materials. Molecular iodine is absorbed according to: 304 stainless steel < Zircaloy < Inconel 600Influence of pH has been studied: absorption increases in acidic medium and decreases in basic medium. Molecular iodine absorption increases with temperature. Phenomenons which occur with iodine during the cold shutdown of a nuclear reactor and during its restart are discussed from the point of vue of iodine volatilization risk.

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Gamma Radiation Effects on Time-Dependent Iodine Partitioning

Cited by 10 publications

References 1 publication

The volatilization of iodine species over dilute iodide solutions

The volatilization of iodine species over dilute iodide solutions

Reassessment of Reactor Coolant and Iodine Chemistry under Accident Conditions

Absorption of iodine from aqueous solutions on nuclear reactors alloys

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