OTHER TOPICS

COOLANT CHEMISTRY & CORROSION

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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Decontamination and Steam Generator Chemical Cleaning

(LCC5 STR)
The objective of this Report is to help the reader to gain a basic understanding of the mechanisms involved in the Decontamination and the Steam Generator Chemical Cleaning Processes. The processes described do not only deal with the basic description but also with application considerations. A second approach to Decontamination is a chronology of the plant applications which range from components to subsystem and full system Decontamination.

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PWR/VVER Primary Side Coolant Chemistry, Volume I – Technical Basis and Recent Discussions

(LCC7 STR)
This report is the first volume out of two focusing on PWR/VVER chemistry. This document is intended to provide a detailed description of the PWR/VVER Primary Side Coolant Chemistry. Furthermore, it should provide a strong support to the utilities for establishing a responsive plant specific chemistry program. It may also help the Manufacturers and Regulators at having a detailed approach of primary water chemistry and corresponding issues.

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PWR and VVER Secondary System Water Chemistry

Adequate secondary side water chemistry is crucial for safe and economical PWR and VVER plant operation. A good practised water chemistry control avoids degradation problems of the key components, sucj as steam generators (SG), carbon steeel components and turbine. The PWR and VVER Secondary System Water Chemistry Report gives a complete overview of the various rationale approaches to optimize the water chemistry according to the design and materials as well as the specific situation of each Nuclear Power Plant.

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Operational Issues and Practices in PWRs

Operational Issues and Practices are important issues for plant personnel. These issues may require optimization or an exchange of knowledge to improve plant operation in a safe, economical, environmentally sustainable way. This report combines the following topics of potentially important consequences:

  • Total Organic Carbon (TOC) in primary and secondary system water
  • Best practices for corrosion products removal in reactor coolant systems (RCS) of VVERs and the use of mechanical filters or macroporous resins
  • Best practices for the use of Ion Exchange Resins for RCS, SG blowdown, and the spent fuel pool
  • Best practices to mitigate condenser leakages and recommendations for Operation procedures in case of large impurities ingress
  • The Use of Dispersant to Mitigate Steam Generator Corrosion Product Deposition In addition to the help for utilities, this report may be of interest for manufacturers and regulators in understanding some plant issues.

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Incoming Goods, Hazardous Materials and Aging of Plant Chemicals

The objective of this Report is to provide a comprehensive understanding of controlling the quality of incoming goods in Nuclear Power Plants. The Report will help utilities with checking that their Quality Assurance system is appropriate or modifying it. The Report will also be useful for manufacturers at properly implementing manufacturing, protection, shipping, labelling, etc for avoiding degradation that may be discovered at the very beginning of plant operation. Finally, regulators will have a complete view of the possible risks of degradation and how to verify that the Quality Assurance programs are implemented.

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

(LCC8)
The report covers the impact of manufacturing on microstructure and in-reactor performance of Zr-Nb alloys. The report was co-authored by Russian scientists involved in the development of the Russian Alloys E110, E635 and E125.

1. The EPRI Steam Generator Secondary Side Management Conference covering:
  • Deposit generation and transport
  • Deposit control and mitigation
  • Deposit consolidation and removal
  • Short and long term strategic planning
2. BWR issues presented in the EPRI Conference
3. The Nuclear Power Chemistry Conference covering:
  • Primary water chemistry including:
  • Secondary water chemistry including:
  • Auxiliary systems, cooling water systems, water and waste treatment
  • Lifetime management and plant ageing
  • Maintenance including curative and preventive cleaning methods
  • Future trends and new developments

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