Fuel Reliability Assessment Through Radiochemistry and Poolside Examinations (LCC20) – 2 Reports

Our latest two-volume report, Key Emerging Issues and Recent Progress in PWR/VVER, BWR and New Reactors, provides a comprehensive technical review of the most important operational experience, research findings, and emerging trends presented at the NPC-2025 International Conference in Busan, Korea. The reports cover advanced developments in primary and secondary water chemistry, fuel performance, corrosion mitigation, source term reduction, shutdown chemistry, flexible operation, aging management, radwaste treatment, SMRs, advanced reactors, and digital chemistry optimization programs.

Volume I focuses on PWR/VVER primary and secondary system chemistry, including fuel reliability, CRUD behaviour, zinc injection, potassium hydroxide implementation, steam generator degradation, hydrazine alternatives, shutdown chemistry, and source term control strategies. The report also includes detailed operating experience from EPR startups, chemistry optimization for long-term operation, and extensive benchmarking of global reactor fleets.

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Volume II covers BWR chemistry and radiochemistry, auxiliary and cooling water systems, radwaste treatment technologies, flexible operation, chemistry compliance management, advanced reactor and SMR developments, and long-term aging management. It includes practical lessons learned from recent plant restarts, innovative decontamination technologies, AI-driven chemistry monitoring, and new approaches for minimizing radiation exposure and extending plant lifetime.

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Together, the reports provide utilities, regulators, vendors, and technical specialists with a unique consolidated reference of the latest international developments in nuclear plant chemistry and operational performance, supported by detailed technical analysis, industry data, and real plant experience from operating nuclear fleets worldwide.

Key Issues in Plant Chemistry and Corrosion in BWRs – 2018

(LCC14)

The second report summarising the BWR related papers and various other subjects is designed to provide updated information with the author’s critique and analysis for the benefit of the LCC customers. The report is expected to be a comprehensive summary document incorporating the latest information on BWR water chemistry and decommissioning that would benefit the operators and regulators, and those who have not been able to attend the NPC 2018 Conference.

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Key Issues in Plant Chemistry and Corrosion in BWRs – 2016

(LCC12)

The 20th Nuclear Plant Chemistry (NPC) International Conference, which started in Bournemouth (UK) and held every other year, was held in Brighton (UK) in October 2016. It is the most im­portant conference related to chemistry in Nuclear Power Plants, and covers many new results in this area. The key information presented at this Conference is covered in two separate LCC12 Reports.

This Report summarizes the BWR related papers from the conference and is designed to provide updated information with the author’s critique and analysis for the benefit of the ANT International/LCC customers. The Report is expected to be a compre­hensive document summarising the latest information on BWR water chemistry that would benefit the BWR operators and regulators.

The second report covers PWRs, VVERs, CANDUs, PHWRs and auxiliary systems issues.

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Start-Up and Shutdown Practices in BWRs as well as in Primary and Secondary Circuits of PWRs, VVERs and CANDUs

The objective of this Report is to provide a good understanding of the special problems and appropriate good practices during shutdown as well as during startup of LWRs. The Report provides a worldwide review of Startup and Shutdown Procedures both in the Primary and in the Secondary Circuit of PWRs, CANDUs and VVERs, and in the reactor coolant and main steam containing systems of BWRs.

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Radiochemistry in Nuclear Power Reactors (Light Water Reactors)

VOLUME I
The objective of this Report is to provide a comprehensive understanding of radiochemistry in Nuclear Power Plants which has a large impact on dose rates, operational exposures, maintenance activities, shutdown process, safety issues, environmental constraints and control of proper plant operation.

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Key Emerging Issues and Recent Progress Related to Plant Chemistry/Corrosion in BWR Reactors

(LCC10 AR)
This Report furnished in the LCC10 Programme cover the key information presented at the Nuclear Power Chemistry Conference, in October 2014. The Report not only summarise but also analyse the results to assess in which specific situation the results are applicable.

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Effects of Coolant Chemistry on Fuel Performance

(LCC9 STR)
The intent of this Report is to provide a state-of-the-art knowledge of the mechanisms of the various forms of Zr-alloy corrosion and hydrogen pickup (HPU) and how water chemistry impacts fuel performance, including corrosion and HPU. This knowledge will help implement actions to reduce Zr alloy corrosion and hydrogen pickup.

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LCC9 AR Operational Issues, Practice and Remedies

Operational Issues, Practices and Remedies are important issues for plant personnel and designers. This report combines the following subjects of limited extent but potentially important consequences:

• Degradation of the primary coolant barrier together with mechanical remedies.
• The potential benefits of Enriched Boric Acid (EBA).
• Primary coolant (Co-58, colloids) inventory.
• Degradation of concrete structures in NPPs.
• Colloids, Zeta Potential and Activity Transport.
• Electrochemical Corrosion Potential (ECP) measurements.
• Key points, ”lessons learned” and ”best practices” of several recent conferences.

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CRUD in PWR/VVER and BWR Primary Circuits

The objective of this report is to provide members with the basic understanding of the mechanisms involved and their relationship to material performance and activity buildup. Content of the report is outlined below.

• Fuel cladding failures due to accelerated corrosion
• Axial Offset Anomaly (AOA)
• Pressure drop problems especially in CANDU-plants and VVER units
• Build-up of out-of-core radiation fields
• Shutdown extensions due to high activity releases (Coolant clean-up)
• Increased generation of radioactive waste
• Interference with inspection necessities

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Effect of Zink in BWR and PWR/VVER on Activity Build-Up, IGSCC and Fuel Performance

This Report gives a comprehensive understanding of the zinc chemistry mechanism and information on how Zinc Chemistry in BWR and PWR plants was introduced in the plants and explains the results achieved. This information is useful not only for utilities that are intending to apply Zinc Chemistry in the near future in their plants and for selecting strategies for adding zinc; but also for those utilities that are already applying Zinc Chemistry in order to optimize their strategy based on international experience. It will also be useful for Manufacturers and Regulators.

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