Comprehensive Nuclear Materials, Volume 5: Material by R.J.M. Konings (editor)

By R.J.M. Konings (editor)

Accomplished Nuclear fabrics discusses the foremost sessions of fabrics appropriate for utilization in nuclear fission, fusion reactors and excessive energy accelerators, and for varied capabilities in fuels, cladding, moderator and keep watch over fabrics, structural, practical, and waste material. The paintings addresses the whole landscape of up to date foreign learn in nuclear fabrics, from Actinides to Zirconium alloys, from the worlds top scientists and engineers.
Critically reports the foremost sessions and capabilities of fabrics, helping the choice, evaluate, validation and engineering of fabrics in severe nuclear environment
Fully built-in with F-elements.net, a proprietary database containing necessary cross-referenced estate info at the lanthanides and actinides
Details modern advancements in numerical simulation, modelling, experimentation, and computational research, for powerful implementation in labs and vegetation

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By R.J.M. Konings (editor)

Accomplished Nuclear fabrics discusses the foremost sessions of fabrics appropriate for utilization in nuclear fission, fusion reactors and excessive energy accelerators, and for varied capabilities in fuels, cladding, moderator and keep watch over fabrics, structural, practical, and waste material. The paintings addresses the whole landscape of up to date foreign learn in nuclear fabrics, from Actinides to Zirconium alloys, from the worlds top scientists and engineers.
Critically reports the foremost sessions and capabilities of fabrics, helping the choice, evaluate, validation and engineering of fabrics in severe nuclear environment
Fully built-in with F-elements.net, a proprietary database containing necessary cross-referenced estate info at the lanthanides and actinides
Details modern advancements in numerical simulation, modelling, experimentation, and computational research, for powerful implementation in labs and vegetation

Show description

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Extra info for Comprehensive Nuclear Materials, Volume 5: Material Performance and Corrosion / Waste Materials

Example text

In the early days of PWR operation, the lower limit on hydrogen was set at 25 ml kgÀ1, to provide adequate margin against radiolysis and heavy crud formation. Plant tests in France showed that this limit was excessively conservative and that less than 10 ml kgÀ1 would be satisfactory, provided good control of oxygen was maintained in makeup water. 15 Although this potential is unaffected by lithium/boron/pH (consistent with the fact that these do not greatly influence PWSCC over the range of practical relevance), the equilibrium potential is significantly affected by the dissolved hydrogen 50 40 30 20 10 0 25–30 30–35 35–40 40–45 45–50 Cycle average hydrogen concentration (cm3 kg−1) Figure 18 US plant data for dissolved hydrogen.

As a result, water chemistry advances are now an important part of the overall operating strategy to control material degradation. Primary system water chemistry also affects fuel performance through the deposition of corrosion products on fuel pin surfaces, and influences radiation fields outside the core. Core uprating through increased fuel duty has reduced margins for tolerating corrosion products (CRUD) on BWR fuel pin surfaces. In PWRs, increasing fuel cycle duration has increased the challenge of controlling pH within the optimum range.

1 Evolution of PWR Secondary Chemistry Strategies The objectives of PWR secondary water chemistry control are to maximize secondary system integrity and reliability by minimizing impurity ingress and transport, minimizing SG fouling, and minimizing corrosion damage of SG tubes. 25 PWRs have experienced IGA on both the primary and secondary sides of the Alloy 600 SG tubing, which has been a major contributing cause of the replacement of most of the SGs with mill-annealed tubing, not only in the United States but internationally.

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