Download Corrosion induced by low-energy radionuclides: Modeling of by Gilbert Bellanger PDF

By Gilbert Bellanger

Nuclear strength vegetation emit radiation and debris throughout a number of energies. This radiation may cause corrosion to ensue in significantly vital elements of the plant, which can result in potency and protection difficulties. Gamma rays and neutrons have the top energies and will holiday the steel bonds in inside metal constructions inflicting harm fast and in simply monitored methods. accordingly these kind of radiation and the simplest alloys to take advantage of to mitigate their results were generally researched and their findings utilized. notwithstanding, a similar isn't really actual of low power radiation which results steel constructions otherwise yet can nonetheless reason considerable and dear corrosion. Low power radiation degrades the passive oxide layers that shield metals. with out this protecting layer the metals are simply corroded. This booklet makes use of tritium and tritiated water as types to explain the consequences of low strength radiation at the corrosion of metals in those environments. complete insurance of the fields of liquid and gasoline move, warmth trade, fuel diffusion in fabrics, and of fabrics resistance to corrosion is guarantees the reader has an entire realizing of the way those procedures impact corrosion in nuclear installations. Such an realizing is key for the effective and secure working of all sleek plant that makes use of radioactive fabric and this publication is a severe reference device for somebody curious about the nuclear strength or metals research.* distinctive assurance of low power radiation and its corrosive results in nuclear installations * presents assurance of easy clinical rules contributing to corrosion * an important reference for the secure and effective development and operation of nuclear installations * purposes in strength iteration, gasoline reprocessing, army and civilian purposes. * the 1st e-book to give targeted research of nuclear corrosion through low strength nuclides* the main entire publication to be had for these excited about knowing corrosion in all its elements* maintaining you at velocity with the hot tools which are altering the idea that of corrosion within the nuclear

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Additional info for Corrosion induced by low-energy radionuclides: Modeling of Tritium and Its Radiolytic and Decay Products Formed in Nuclear Installations

Example text

The disadvantage of detritiation by oxidation into tritiated water is that at high temperatures radiolysis phenomena with air are greater thus leading to nitric acid formation at a pH of around 3-4. This tritiated and acid medium induces corrosion of stainless steel in the installations. 4. Material for the first containment The materials for the first containment of tritium must be chosen very carefully. The important parameters influencing the choice include tritium solubility, permeability, bakeability, strength, corrosion behavior, stress fatigue and tritium and helium embrittlement.

Absorption on mole- - - - cular sieves at very low water vapor pressure and room temperature is a widely used method but requires sieve regeneration by heating. a second recombiner of, for example, CuO, to oxidize the remaining tritium at 500°C. The global oxidation factor is approximately lo6. a cooler for control of minimum tritiated humidity. This unit decreases gas humidity to a dew point of -20°C to maintain the total detritiation factor about lo6. Moreover, cold trapping of tritiated water instead of second absorption on the molecular-sieve bed unit would decrease the amount of tritiated solid wastes and facilitate the tritiated water recovery.

With a view to reprocessing the organic products originating in the tritium facilities, an industrial unit was developed (Fig. 13) and constructed for specific treatment and packaging of such products so they were not considered as final waste [IS]. Decontamination is based on a drying process using steam, which results in a decontamination factor of 80%. Furthermore, the volume of the products to be stored is reduced by a factor of 8 by waste compaction. This industrial unit also cuts down the degassing rates of the stored wastes, which allows placing them in 'cold' sites, thus significantly reducing costs and providing an economic advantage to the management of tritiated wastes.

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