Upgrading of radiation monitoring system at the Beloyarsk NPP
In 2009-2013, Sosny R&D Company upgraded the radiation monitoring systems for Units 1 and 2 of the Beloyarsk NPP in order to ensure radiation safety in preparation for decommissioning of the Stage 1. The following scope of work was carried out:
- close investigation of the automation object, optimization and justification of the radiation monitoring scope subject to the applicable regulations, current production objectives and future work on preparation of Units 1 and 2 for decommissioning;
- development of Statement of Work;
- analysis and justification of the choice of software, high- and low-level equipment;
- development of Preliminary and Final Design on upgrade of the radiation monitoring system for Units 1 and 2 of the Beloyarsk NPP in order to ensure the radiation safety of decommissioning of the Stage 1. ARMS of Units 1,2 of the Beloyarsk NPP;
- Preliminary and Final Design is concurred with the Research and Design Institute ATOMENERGOPROEKT, S.Petersburg, the General Designer of the Units 1 and 2;
- expert assessment of Preliminary and Final Design at Scientific and Engineering Center for Nuclear and Radiation Safety, a positive expert review is obtained;
- development and verification of application software for ARMS of Units 1,2 of the Beloyarsk NPP;
- preparation of cost estimates for construction, mounting and pre-commissioning work for the radiation monitoring equipment at the Stage 1 facilities of the Beloyarsk NPP in compliance with Preliminary and Final Design;
- fabrication of the ARMS high-level equipment of Units 1 and 2 of the Beloyarsk NPP, acceptance tests witnessed by representatives of FSUE VO Safety, delivery of the equipment to the Beloyarsk NPP.
The ARMS of Units 1 and 2 of the Beloyarsk NPP is a multistage, geographically dispersed system covering a set of Stage 1 facilities and NPP buildings:
- main building of Units 1 and 2;
- water treatment facility;
- LRW storage facility;
- SRW storage facility;
- sewage treatment facilities;
- NPP site.
Low-level engineering equipment is based on:
- smart units and detecting units;
- portable, movable and fixed instruments;
- actuators (sampling lines valves);
- local optical acoustic alarms.
The ARMS high-level equipment consists of:
- data collection stations (at the facilities);
- automated workstations 1 and 2 of the Radiation Safety Department (RSD) engineer;
- automated workstation of technical support and metrology;
- automated workstation of laboratory analysis;
- database server (DBS);
- control and commutation cabinets;
- uninterrupted power source (as a part of the DBS and RSD engineer automated workstations 1 and 2);
The information is displayed on two monitors of RSD engineer workstations 1 and 2 in the form of:
- common mnemocircuits and premise mnemocircuits with radiation color indication;
- numeric values of the measured data with control points marked on the premise plans, mnemocircuits with equipment diagnostics results and errors in measuring of the controlled variables;
- tables with the current values of the controlled variables;
- variable-time interval diagrams with an option to display the average value calculation of the variable for the period between two marks on the diagram;
- preview of the data to be printed.
Preliminary design solutions and Preliminary and Final Design are made up in strict compliance with the national standard for automated systems, Unified System of Design Documents and regulatory documents for nuclear facilities, which is confirmed with the expert assessment results. Preliminary and Final Design consists of about 350 documents.
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