OTHER TOPICS

COOLANT CHEMISTRY & CORROSION

Key Emerging Issues and Recent Progress Related to Plant Chemistry/Corrosion in PWR/VVER/CANDU Reactors 2014–2015

(LCC11 AR)
Operational issues with their link to other aspects are of large interest for Utilities as well as Regulators, Designers, Manufacturers and Laboratories. This LCC11 Report is covering two technical aspects dealing with: 1) Recycling of waste in primary coolant and, 2) Secondary water chemistry options and Hide out return of impurities from Steam Generators (SG).

Recycling of primary water wastes, is becoming more important to minimize both chemical and radiochemical releases into the environment. A specific focus is given to Tritium impact since this element is not eliminated by purification systems and thus recycled together with concentrates and distillates.

The secondary side chemistry is one of the key factors that are influencing safety, reliability and particularly availability of PWR and VVER Nuclear Power Plants. This Report gives: 1) all the relevant information to select the best chemistry options with the type and concentration of reagents that are used – with their advantages and disadvantages and, 2) the relation between the chemistry specification at SG blowdown and the various options of secondary treatment and purification systems.

The Hide out process and influencing parameters for different types of chemical elements and Hide Out Return of species from the Steam generators is also covered in this Report.

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Consequences of Power Uprating

A relatively high percentage of all operating LWRs in the world have implemented or are considering some kind of increase of the power (power uprate). This Report provides a worldwide review of power uprates. Water chemistry and radiology experiences of power uprates are presented separated on BWRs and PWRs. Key issues are identified and discussed and available options to assure maintained or improved conditions at power uprates are presented.

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LCC5 Annual Report

The Report covers the following topics:

  • PWR/VVER primary side coolant chemistry
  • BWR coolant chemistry
  • PWR and VVER secondary side chemistry
  • Materials degradation
  • Intergranular stress corrosion cracking and irradiation-assisted stress corrosion cracking of cold worked/irradiated stainless steels in de-oxygenated PWR-type coolants

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LCC4 Annual Report

The Report covers the following topics:

  • Nuclear plant primary water chemistry experience (PWR, VVER and BWR)
  • Water chemistry sampling and monitoring (PWR, VVER and BWR)
  • Corrosion product control and sampling technique (secondary side, PWR, VVER)
  • Material degradation management
  • Fuel /water chemistry interaction
  • Behaviour of radiolysis gases in BWRs and PWRs

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LCC2 Annual Report

The Report covers the following topics:

  • Coolant Quality and Control Issues – PWR/VVER Water Chemistry – BWR water chemistry
  • Structural Materials Degradation
  • Primary Circuit Corrosion (BWRs and PWRs) – SCC, PWSCC in PWRs – SCC in BWRs and remedies (HWC, NMCA)
  • Dose Rate Buildup and Control (BWRs and PWRs)

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LCC1 Annual Report

The Report covers the following topics:

  • Coolant Quality and Control Issues – PWR Water Chemistry – BWR water chemistry
  • Materials selection for the primary BWR and PWR circuits
  • Primary Circuit Corrosion (BWRs and PWRs) – SCC, PWSCC in PWRs – SCC in BWRs and remedies (HWC, NMCA)
  • Dose Rate Buildup and Control
  • Fuel/Water Chemistry Interaction

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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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Key Emerging Issues and Recent Progress Related to Plant Chemistry/Corrosion (PWRs, VVERs, CANDUs, PHWRs, and Auxiliary Systems)

(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 does not only covers PWRs, VVERs, CANDUs, PHWRs and auxiliary systems issues but also summarizes and analyses the results to assess in which specific situation the results are applicable and give the point of view of experts of ANT International that atended the Conference.

The second report covers BWRs and Fukushima response.

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