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Zairyo-to-Kankyo
Vol. 57 (2008), No. 12

Zairyo-to-Kankyo Vol. 57 (2008), No. 12

A Significance of Defense for ···

Hachiro Imai

pp. 513-513

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A Significance of Defense for ···

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DOI:10.3323/jcorr.57.513
Role of Chemistry in Analysis on the Leakage Incident of Sodium from the Fast Breeder Reactor of “Monjyu”

Masao Takahashi

pp. 514-523

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Role of Chemistry in Analysis on the Leakage Incident of Sodium from the Fast Breeder Reactor of “Monjyu”

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DOI:10.3323/jcorr.57.514

Abstract

The chemical reactions of Na-Fe-O₂-H₂O system and their equilibrium constants (600∼1200 K) were expressed in terms of standard equilibrium O₂ pressure P⁰ and standard potential E⁰. The results were graphically illustrated on the equilibrium daiagrams of log P_(O₂)(O₂ partial pressure) vs. log(Na₂O)(basicity) or E(potential) vs. log(O²⁻)(basicity). These daiagrams visually and comprehensively show the equilibrium relations in the reactions among molten Na with O₂, H₂O and Fe with their reaction products and give a useful information for analysis of the leakage incident of sodium from the fast breeder reactor of “Monjyu”.
Corrosion Behavior of Stainless Steel in Nitric Acid Solutions Including Neptunium

Takafumi Motooka, Masahiro Yamamoto

pp. 536-541

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Corrosion Behavior of Stainless Steel in Nitric Acid Solutions Including Neptunium

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DOI:10.3323/jcorr.57.536

Abstract

In order to investigate a corrosion behavior of stainless steel in the typical nuclear fuel reprocessing plant, corrosion tests using nitric acid solution with neptunium were conducted under atmospheric and the reduced pressure conditions in the laboratory where radioactive substance could be handled. An ultra low carbon type of SUS304ULC stainless steel was used. Obtained results were as follows: Under the reduced pressure condition, corrosion of the stainless steel was accelerated in the nitric acid solution with neptunium than in pure nitric acid solution. Under an atmospheric condition, the corrosion rate of the stainless steel increased with increase of neptunium content. The higher solution temperature enhanced the corrosion rate of the stainless steel in the nitric acid solution with neptunium. Thermodynamic data showed that Np(V) oxidized to Np(VI) by concentrated and elevated nitric acid solution. The corrosion potential of the stainless steel shifted to nobler direction in the nitric acid solution with neptunium. It is estimated that the electrochemical reaction of Np(VI)/Np(V) is reversible and the rate constant of the reaction has great values. And it is considered that the dominance of Np(VI) in nitric acid solution accelerated the corrosion rate of the stainless steel in the solutions with neptunium.
Development of Monitoring Method for Coating Condition inside Ballast Tank using Numerical Inverse Analysis

Atsushi Nakayama, Kenji Amaya, Norio Yamamoto, Koji Terai

pp. 542-547

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Development of Monitoring Method for Coating Condition inside Ballast Tank using Numerical Inverse Analysis

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DOI:10.3323/jcorr.57.542

Abstract

We developed the quantitative monitoring method for coating condition inside a ballast tank. We proposed the coating condition is evaluated with the surface resistance. We developed the identification method to obtain the whole surface resistance from the differential potential induced by the impressed current from an optional anode inside a tank. We introduced differential potential measurement and inverse analysis to obtain the surface resistance representing the coating condition. The potential measurement and quantitative evaluation were conducted in the actual ship. The verification was performed and there was the good agreement between the proposed method and the preliminary visual inspection.

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Zairyo-to-Kankyo Vol. 57 (2008), No. 12

A Significance of Defense for ···

Share it with SNS

Role of Chemistry in Analysis on the Leakage Incident of Sodium from the Fast Breeder Reactor of “Monjyu”

Share it with SNS

Corrosion Behavior of Stainless Steel in Nitric Acid Solutions Including Neptunium

Share it with SNS

Development of Monitoring Method for Coating Condition inside Ballast Tank using Numerical Inverse Analysis

Share it with SNS

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