Implementation of New Reactivity Measurement System and New Reactor Noise Analysis Equipment in a VVER-440 Nuclear Power Plant

The paper deals with two recently developed, high-precision nuclear measurement systems installed at the VVER-440 units of the Hungarian Paks NPP. Both developments were motivated by the reactor power increase to 108%, and by the planned plant service time extension. The first part describes the RMR...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2010-10, Vol.57 (5), p.2689-2696
Main Authors: Vegh, J, Kiss, S, Lipcsei, S, Horváth, C, Pos, I, Kiss, G
Format: Article
Language:English
Subjects:
Anomalies
Control systems
Current measurement
Data acquisition
Fission reactors
Inductors
Ionization chambers
Neutrons
Noise
noise measurement
Nuclear engineering
nuclear measurements
Nuclear power generation
Nuclear reactor components
Nuclear reactors
Portability
Power plants
process monitoring
Signal processing
Studies
Temperature measurement
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Summary:The paper deals with two recently developed, high-precision nuclear measurement systems installed at the VVER-440 units of the Hungarian Paks NPP. Both developments were motivated by the reactor power increase to 108%, and by the planned plant service time extension. The first part describes the RMR start-up reactivity measurement system with advanced services. High-precision picoampere meters were installed at each reactor unit and measured ionization chamber current signals are handled by a portable computer providing data acquisition and online reactivity calculation service. Detailed offline evaluation and analysis of reactor start-up measurements can be performed on the portable unit, too. The second part of the paper describes a new reactor noise diagnostics system using state-of-the-art data acquisition hardware and signal processing methods. Details of the new reactor noise measurement evaluation software are also outlined. Noise diagnostics at Paks NPP is a standard tool for core anomaly detection and for long-term noise trend monitoring. Regular application of these systems is illustrated by real plant data, e.g., results of standard reactivity measurements during a reactor startup session are given. Noise applications are also illustrated by real plant measurements; results of core anomaly detection are presented.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2010.2053384