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3-Module Security System at NPP


Development of 3-Module Security System (Control over Vibrations, Coolant’s Leaks, and Shocks) at Nuclear Power Plant (NPP)

Tech Area / Field

  • FIR-ENG/Reactor Engineering and NPP/Fission Reactors
  • FIR-EXP/Experiments/Fission Reactors
  • FIR-INS/Nuclear Instrumentation/Fission Reactors
  • FIR-NOT/Nuclear and Other Technical Data/Fission Reactors
  • FIR-NSS/Nuclear Safety and Safeguarding/Fission Reactors

3 Approved without Funding

Registration date

Leading Institute
Armenian Scientific-Research Institute of Nuclear Power Plants Exploitation, Armenia, Yerevan

Supporting institutes

  • All-Russian Research Institute for Nuclear Power Plant Operation, Russia, Moscow


  • Industry Products International Company LLC, USA, PA, Monroeville\nCORYS, France, Grenoble\nWestinghouse Electric Company, USA, PA, Pittsburgh\nHGW Ingenieurgesellschaft mbH, Germany, Greifswald

Project summary

1. Project Goal

The goal of the project is to develop 3-Module Safety System for WWER Nuclear Power Plant with consisting of the following modules:

- Monitoring of coolant leaks in the primary system
- Monitoring of vibrations of main elements in the primary system
- Monitoring shocks in the primary circuit with the provision of monitoring and complex diagnostics of the condition of elements being controlled.

2. Current State of the Problem

At present, in number of countries (USA, Germany, France, Japan), mainly separate independent systems for primary system equipment monitoring are developed and installed. They mostly resolve the monitoring problems (the control over the condition of objects being monitored). As to diagnostics (identification of causes of defects, prognosis on their development), especially complex diagnostics, currently this problem is not well researched, although it is a basis for safe functioning of NPP power generating units.

3. Contribution of the Project Proposed to the Problem’s Solution

Based on international experience in development of diagnostics systems on leak control, vibration control, and detection of loose parts, for the purposes of improving safety of Nuclear Power Plants operation, the project proposed implies development of 3-module safety system for Nuclear Power Plant that will provide the following functions:

- Control over the coolant’s leak (fixing the fact of the leak, localizing, and determining the leak rate) based on a new concept, which excludes calibrating procedures from the system’s hardware/software (H/S).

- Vibration monitoring of primary system elements - Main Circulation Pump (MCP), Steam Generator (SG), Main Locking Bolt (MLB), Main Circulation Tract (MCT) – with resonance identification (attributing the resonant frequency to concrete element) in the specters of signals of indicators with differentiation of oscillations of elements controlled and identity estimation based on the structure of specters of identical elements of primary system.

- Detection of loose parts and identification of shocks with localization of energy (shock) source and determination of shocking object’s mass.

- Complex analysis of primary system’s condition by noise processes and displacements caused by the vibration (identification and determination of anomalies causes, localization of energy sources, evaluation of vibro-condition of rotating and non-rotating elements, analysis of coherence of vibrodisplacements and noise processes).

4. Scientific Competence of the Project Participants

The project proposed joins efforts of scientists that have worked on military technologies in different time periods. 3 Ph. D.‘s and 7 Ph. D. candidates experienced in development of safety systems, control and diagnostics of Nuclear Power Plants’ equipment are involved in this project.

5. Expected Results

The project is oriented towards obtaining the following results.

- Development of algorithms and software (A & S) for 3-module monitoring system for Nuclear Power Plant's primary system with WWER (leak, vibration, and shock monitoring), as well as development of system's hardware.

- Algorithms and software for complex diagnostics of elements of Nuclear Power Plant's primary system with WWER.

Algorithms and software for the synthesis of system's A & S with A & S of existing monitoring systems for Nuclear Power Plant's primary system with WWER.

6. Realization of ISTC Goals

The project involves scientists from CIS countries (Armenia, Russia) having large work experience on Nuclear Power Plants safety, regulation and monitoring systems, who are now being reoriented towards peaceful activities - applied researches on improvement of NPP safety.

7. The Volume of Activities

The following research activities are planned to be conducted in order to achieve the project’s goal:

- Substantiation of the necessity and feasibility of realization of the new concept of functioning of the coolant’s leak monitoring system, and development of algorithms and software for the leak monitoring system with the realization of multi - criteria hierarchical structure of leak localization.

- Substantiation of expediency of combining the vibration monitoring system and the loose parts detection system in the primary system of NPP power generating units, and development of algorithms and software for the combined system of vibration monitoring and loose parts detection with the provision for detection of the energy source, determination of the mass of shocking object, and identification of resonance of indicators’ signals.

- Autonomous testing of the leak monitoring system and the combined system of vibration monitoring and loose parts detection at the power generating unit #2 of Armenian Nuclear Power Plant and VNIIAES stands.

- Synthesis of algorithms and software for 3-module safety system, complex testing of 3-module safety system and preparation of software/hardware documentation.

8. The Role of Foreign Collaborators

The project proposed implies the following cooperating activities with the foreign collaborators.

- Information exchange during the project implementation.
- Comments to the technical reports submitted by the project participants to ISTC.
- Cross-checking of the results obtained during the project’s implementation.
- Participation in testing of the system’s software, conducted by ISTC associates.
- Organizing joint symposiums and seminars.

9. Technical Approach and Methodology

The implementation of the project must be carried out according to the following scheme: for every module, algorithms and software must be developed and tested autonomously. Synthesis of the modules must be done and complex testing conducted using diagnostics systems and equipment of “Armatom” Institute, VNIIAES and Armenian Nuclear Power Plant.


The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.


ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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