The Modernisation of Liquid and Gaseous Effluents Monitoring Systems in the Kozloduy Nuclear Power Plant

The modernisation of the radiation monitoring systems of gaseous and liquid effluents in the Kozloduy NPP took place in two separate projects carried out by VF.

The goal of the first project was the modernisation of an existing system in reactor units 1-4, and its optimisation for the effluents environmental impact control during the decommissioning of these units (from shutdown to their safe disposal).

The second project complemented the gaseous effluents monitoring system in the ventilation stacks of units 5 and 6 and in the auxiliary building by measurement of the radionuclide-specific activity of radioactive noble gases for the purpose of reporting to Bulgarian regulatory authority.

1. HLG10 project – Optimisation of the EFFLUENT monitoring system of the Kozloduy NPP

The scope of deliveries within the project

New pipeline routes for air sampling in the VK1 and VK2 ventilation stacks
Equipment for continuous, representative, isokinetic and proportional aerosol collection – BOA-80 aerosol samplers
Equipment for periodic quantitative sampling of Kr-85 collected in a Marinelli-type vessel – VP-2000 samplers
Equipment for continuous proportional H-3 and C-14 sampling – V3H14C samplers and DJ-500 desorption units
Equipment for continuous airflow measurement in ventilation stacks
Modernisation of in-situ liquid discharges’ monitoring system – new LES-WS3T wastewater stations
A computer system for data collection and management, including a database server, operator workstations, a service laptop and corresponding software
Equipment and devices for laboratory sample analysis
A set of spare parts

Performed work and provided services

The elaboration of detailed project documentation, including isokinetic and pipeline factor calculations of the sampling paths
Acceptance test method development
The elaboration of accompanying technical documentation, including operating and maintenance instructions
Production and acceptance testing on the contractor’s premises
Equipment certification
The delivery of all equipment to the Kozloduy NPP
System installation and commissioning
Initial metrological verification
End-user support during licensing
End-user personnel training
Acceptance testing at the installation site and commissioning
The elaboration of the actual sate documentation
Ensuring supply of spare parts for both warranty and post warranty servicing

2. The delivery and installation of an automated system for the determination of radionuclide composition OF radioactive noble gases’ concentration in the ventilation stacks in EB 5 and 6 and BAPP 3

Within the framework of the project, a radioactive noble gas activity measuring system in the operating ventilation stacks of the Kozloduy NPP was modernised to comply with the recommendations of the European Commission’s EURATOM.

The scope of delivery

A new pipeline for air collection
Five pieces of noble gas monitors with high resolution gamma spectrometry – NGM-2000 devices
A computer system for data collection and management, including a database server, operator workstations, a service laptop and corresponding software
A set of spare parts

Performed work and provided services

The elaboration of detailed project documentation, including pipeline factor calculations of the sampling paths
Acceptance test methods’ development
The elaboration of accompanying technical documentation, including operating and maintenance instructions
Production and acceptance testing on the contractor’s premises
Equipment certification
The delivery of all equipment to the Kozloduy NPP
System installation and commissioning
Initial metrological verification
End-user support during licensing
End-user personnel training
Acceptance testing at the installation site and commissioning
The elaboration of as-built documentation
Ensuring the supply of spare parts for both warranty and post-warranty servicing

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References