Armenian Nuclear Power Plant CJSC

www.anpp.am/
Armavir, Armenia
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Petrosyan V.G.,Armenian Nuclear Power Plant CJSC | Hovakimyan T.H.,Armenian Nuclear Power Plant CJSC | Yeghoyan E.A.,Armenian Nuclear Power Plant CJSC | Hovhannisyan H.T.,Armenian Nuclear Power Plant CJSC | And 2 more authors.
Thermal Engineering | Year: 2017

This paper is dedicated to the creation of a facility for the experimental study of a phenomenon of background acoustic emission (AE), which is detected in the main circulation loop (MCL) of WWER power units. The analysis of the operating principle and the design of a primary feed-and-blow down system (FB) deaerator of NPP as the most likely source of continuous acoustic emission is carried out. The experimental facility for the systematic study of a phenomenon of continuous AE is developed. A physical model of a thermal deaerator is designed and constructed. A thermal monitoring system is introduced. An automatic system providing acoustic signal registration in a low frequency (0.03–30 kHz) and high frequency (30–300 kHz) bands and study of its spectral characteristics is designed. Special software for recording and processing of digitized electrical sensor signals is developed. A separate and independent principle of study of the most probable processes responsible for the generation of acoustic emission signals in the deaerator is applied. Trial series of experiments and prechecks of acoustic signals in different modes of the deaerator model are conducted. Compliance of basic technological parameters with operating range of the real deaerator was provided. It is shown that the acoustic signal time-intensity curve has several typical regions. The pilot research showed an impact of various processes that come about during the operation of the deaerator physical model on the intensity of the AE signal. The experimental results suggest that the main sources of generation of the AE signals are the processes of steam condensation, turbulent flow of gas-vapor medium, and water boiling. © 2017, Pleiades Publishing, Inc.


Sevikyan G.,Armenian Nuclear Power Plant CJSC | Vardanyan M.,Armenian Nuclear Power Plant CJSC | Apikyan S.,Advanced Science and Technology Center
NATO Science for Peace and Security Series B: Physics and Biophysics | Year: 2010

The structure of the Armenian electric energy system is presently well balanced. The production capacity mix consists of about ?420% nuclear, of about ?40% gas, and ?18% hydropower capacities. Before 2012, almost exclusively, new gas fired power plants are expected to be constructed, and some old gas fired ones are predicted to be closed down. A significant change in the structure of energy-production would occur after 2016, if the ANPP unit was shut down with the expiry of its operational license limited recently by the design lifetime. © 2010 Springer Science+Business Media B.V.


Apikyan S.,Advanced Science and Technology Center | Diamond D.,Brookhaven National Laboratory | Yerznkanyan K.,Advanced Science and Technology Center | Vardanyan M.,Armenian Nuclear Power Plant CJSC | Sevikyan G.,Armenian Nuclear Power Plant CJSC
NATO Science for Peace and Security Series B: Physics and Biophysics | Year: 2010

The weapons of mass destruction (WMD) threats facing the world are constantly evolving and have grown more complex since the end of the Cold War. After the breakup of the Soviet Union in 1991, the former soviet republics inherited the world's largest arsenal of chemical, biological, radiological and nuclear (CBRN) materials. The republics also inherited the technologies needed to create weapons of mass destruction. The absence of security systems, accounting systems and controls for export of technology, materials and missile programs poses one of the most serious threats to international security because the possibility of diversion of CBRN materials and technologies to rogue nations and terrorist organizations has increased. © 2010 Springer Science+Business Media B.V.


Nikoghosyan S.K.,Yerevan Physics Institute | Sahakyan A.A.,Yerevan Physics Institute | Gavalyan V.B.,Yerevan Physics Institute | Harutyunyan V.V.,Yerevan Physics Institute | And 6 more authors.
Central European Journal of Physics | Year: 2011

Electro-physical parameters of super-thin basalt fiber (STBF) from Armenian basalt rocks are measured before and after hydrochloric acid treatment. It is shown that specific resistance and dielectric parameters of super-thin basalt fiber change essentially after hydrochloric acid treatment. The temperature dependence of these parameters was studied too. The probable cause of the change is an increase in the total amount of pores and modification of the share of pores of various sizes in STBF, followed by an increase of absorption of water molecules from the ambient medium. The results (in both alternating and direct electric fields) are interpreted within the framework of the dipole-relaxation mechanism of the polarization of water molecules in STBF pores. © 2011 Versita Warsaw and Springer-Verlag Wien.


Vardanyan M.,Armenian Nuclear Power Plant CJSC
NATO Science for Peace and Security Series B: Physics and Biophysics | Year: 2010

In area of Armenian nuclear power plant location, in atmospheric air in majority of cases log two technogenic radionuclides: 137Cs and 90Sr. Presence of these radionuclides basically is caused by global fall out (consequences of tests of the nuclear weapon and Chernobyl NPP accident), whose contribution to the contents of these radionuclides in atmosphere is incomparably greater, than emissions from the NPP. However there are some cases when in an atmosphere are registered the technogenic radionuclides, caused by emissions from NPP. In the present work such case is considered. © 2010 Springer Science+Business Media B.V.


Kryukov A.,Nuclear Research and Consultancy Group | Sevikyan G.,Armenian Nuclear Power Plant CJSC | Petrosyan V.,Armenian Scientific Research Institute for Nuclear Plant Operation ARMATOM | Vardanyan A.,Armenian Scientific Research Institute for Nuclear Plant Operation ARMATOM
Nuclear Engineering and Design | Year: 2014

Abstract The basic results of the Armenian RPV surveillance program are presented. A change in ΔTk - neutron fluence trend curve shape is observed at a fluence of more than 4 × 1020 cm-2 for both base metal and weld. The prediction of radiation embrittlement of Armenian RPV materials was performed on the basis of surveillance data and information from the IAEA International Database on RPV materials. Because the original weld surveillance data could not be used for the Armenian RPV weld embrittlement assessment, an analysis of selected data from the Database was carried out. Six welds and two base metals of WWER-440 steel with P and Cu contents similar to Armenian welds were selected and their embrittlement results were compared with the Russian Regulatory Guide prediction. It is demonstrated that the Guide corresponding to Af = 24.64 (chemistry factor for Armenian RPV weld No. 4) predicts the irradiation embrittlement of the selected steels conservatively. According to the Guide prediction the Tk for weld No. 4 should not exceeded 145 C by 2016. It is also demonstrated that the Armenian base metal irradiation embrittlement is substantially less than the Guide prediction. © 2014 Elsevier B.V.

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