Article

Reaction of the Soil Microbiota on the Influence of Armenian Nuclear Power Plant

June 2014

Authors:

Garnik Khachatryan

Yerevan Physics Institute

Show all 7 authorsHide

By the use of detectors with NaI and pure germanium, supplied with corresponding programs, the distribution of 137Cs in soil in the region of Armenian Nuclear Power Plant (NPP) location along a primary direction of winds movement has been investigated. It is shown, that on the curve of 137Cs distribution there is a maximum alee, specifying the contribution from NPP that makes up approximately 20-25 % from a background caused by global fallouts. Investigation of total amount of bacteria in samples of the soil, executed by traditional methods of microbiology, has shown that from the windward side of NPP are not registered considerable variations of number of bacteria. Alee from the NPP statistically authentic increase in the general number of microorganisms is revealed, and their maximum number is revealed in the point corresponding to a maximum on the curve of 137Cs distribution.

ResearchGate has not been able to resolve any citations for this publication.

ResearchGate has not been able to resolve any references for this publication.

Article

Full-text available

Personnel dose assessment due to the normal operations with the artificial radiation sources accordi...

January 2016 · Radiatsionnaya Gygiena = Radiation Hygiene

The aim of the study was personnel dose assessment due to the normal operations with the artificial radiation sources. The article is based on the data from the Unified System of Individual Dose Control and Voronezh Region’s radiation-hygienic passport. The data from No.1-DOZ “Information on personnel exposure doses under normal operation of technogenic ionizing radiation sources” and over a ... [Show full abstract] period of 2006-2010 years were analyzed. In 2006-2015, the number of organizations, which submitted form No.1-DOZ “Information on personnel exposure doses under normal operation of technogenic ionizing radiation sources”, increased from 175 to 229. In amount of the radiation facilities, Novovoronezh Nuclear Power Plant is the first. Novovoronezh NPP has 1512 sources, which amounts to 51,9% from all sources in Voronezh Region (2915). Health care facilities have 869 radiation sources or 29,8%. X-ray machines are the main part of these sources (844 health care facilities or 97,1% of all medical sources). Industrial sources occupy third place with 305 facilities or 10,5% of all considered sources. In 2015, according to the data from Voronezh Region’s radiation-hygienic passport, the number of “A” group personnel were 4237, the number of “B” group personnel were 2341. The average individual dose for personnel was over the range from 0.66 to 2.02 mSv. Collective dose was from 4.16 to 11.79 man-sieverts per year. The increase of number of the radiation sources has attended with the decrease of individual and collective doses. The most likely it is related to using the modern facilities. In 2015, the maximum value of the average individual dose of “A” group personnel was registered in Voronezh regional hospital (6.17 mSv y–1). There are medical facilities with unsealed and sealed sources in this hospital. In 2006-2015, the average individual doses of personnel of all radiation facilities that use radiation sources in Voronezh region were significantly below the dose limits established by the Radiation Safety Standards NRB-99/2009.

Chapter

Some Aspects of Radioecology in the Areas Adjacent to Armenian NPP

January 2016

The distribution of 137Cs in the soils adjoining to Armenian Nuclear Power Plant along the predominant direction of winds is investigated. It is shown that the maximum on the curve of distribution of 137Cs corresponds to the leeward of ANPP, indicating a specific content of 137Cs that exceeds the background level due to the global fallout by about 20–25 %. A study of the total number of ... [Show full abstract] bacteria in the samples taken from the points of monitoring performed by the traditional methods of microbiology, showed that alee from ANPP, there is observed a statistically significant increase in the total amount of microorganisms with a maximum at the point that corresponds to the maximum on the radionuclide distribution curve. The same samples were examined in order to determine the quantitative contents of relatively radiosensitive and closely related bacteria species of P. putida and P. fluorescense and that of relatively radioresistant bacilli B. mesentericus and B. subtilis: the radiosensitivity of the latter was also investigated. It is shown that in soils with a high content of 137Cs the number of Pseudomonas cells with their somewhat increased radioresistance is lower than in the control sites. The content of cells of the Bacillus genus varies without certain regularity, and survival curves have almost the same characteristics at all the points.

Article

Full-text available

Maximum Fragility Analysis of Loviisa Nuclear Power Plant Ventilation Stack for Wind Loads

Pentti Varpasuo

The task in this assignment is to analyze the ventilation stack fragility of the Loviisa NPP. The stack is 107.5- meter high reinforced concrete cylinder and it serves both units of the Loviisa plant. The foundation soil underneath the stack foundation is solid rock with only very moderate weathering. In this fragility analysis the rock stiffness characteristics are utilized for evaluating the ... [Show full abstract] spring constants for soil-structure interaction problem for evaluating the eigenfrequencies and natural mode shapes of the stack. The spring constants were developed using the elastic half- space theory. The obtained spring constants are frequency independent. The load for which the stack fragility is evaluated is the mean hourly wind speed load. This load parameter has a wide statistical database of measured values from various regions of the world and is therefore suitable for characteristic parameter against which the stack conditional failure probability is evaluated in all investigated stack sections. For Loviisa ventilation stack the result of the fragility analysis against the wind effects can be summarized in the following table:

Article

Full-text available

The Seismological Monitoring System of the Ignalina Nuclear Power Plant during the period 1999-2009

June 2011

Seismological monitoring of Lithuania and adjacent territories was performed using data of the seismic network of the Ignalina NPP. Only very few local tectonic events were registered during last decade of seismological monitoring. A few tenths of local events were associated with explosions in quarries or explosions carried out during operations of elimination of old explosives in the Baltic ... [Show full abstract] Sea. After seismic system of Ignalina NPP was upgraded in 2008 number of registered teleseismic and regional events increased up to a few hundred every year. The paper is written in Lithuanian; however, there is extended summary in English and all captions of figures are also doubled in English.

Chapter

Use of Lagrangian Particle Model Instead of Gaussian Model for Radioactive Risk Assessment in Comple...

January 2007

In this work an experience of using Lagrangian Particle model Spray (in AriaIndustry package from Arianet, Italy) for risk assessment at Krško Nuclear Power Plant (NPP) in Slovenia is described. Krško NPP is placed in a semi-open basin sourrounded with very complex terrain. The area is characterised by very low wind speeds and thermal inversions.

Article

Full-text available

Verificated Techniques for the Numerical Simulation of Extreme Impacts on NPP Constructions

December 2015 · Procedia Engineering

The distinctive paper is devoted to advanced methods of analysis, choice of appropriate and correct methods and software application packages for numerical simulation of external loads and impacts on the basic structures of nuclear power plants (wind hurricane, tornado, plane crash, the impact of the shock wave, seismic and tsunami effect). The article gives examples of representative ... [Show full abstract] calculations.

Article

Full-text available

Ecological Chronology of Nuclear Fuel Cycle Sites

January 1995 · Radiocarbon

We compared 14 C levels in annual growth rings of pine trees around the Tomsk nuclear fuel reprocessing plant (NFRP) and the Chernobyl nuclear power plant (NPP). At the Chernobyl site, samples were taken from the control area (within a 30-km radius zone around the site) to a distance of 80 km. In Tomsk, we collected samples between 8–10 km and 10–15 km from the site, taking into account ... [Show full abstract] prevailing wind directions. Background samples were collected 200 km from the plant. Samples were converted to benzene and counted in an ultra-low-level LSC Quantulus 1220™. Because of the Chernobyl accident, a signal can be detected in the background of routine plant operation. Comparison with the Tomsk data suggests that the routine discharges from Tomsk are more significant than the discharge from the Chernobyl accident. We estimated Tomsk NFRP annual discharge level at up to 30–45 TBq 14 C from 1985 to 1988.

Article

Weibull parameter calculation and estimation of directional and seasonal wind speeds for the return...

February 2015 · Annals of Nuclear Energy

Article

Full-text available

DAMAGE EVALUATION OF A RCC CONTAINMENT STRUCTURE SUBJECTED TO INTERNAL PRESSURE

April 2012 · International Journal of Engineering Science and Technology

One of the most important components of a nuclear power plant (NPP) is its containment structure whose capacity under internal pressure plays a major role in safety related issues. The design of a nuclear power plant is governed by the design pressure under internal pressure load and external events like earthquake, missile impact, wind etc. Three dimensional finite element analysis is done using ... [Show full abstract] ABAQUS. To simulate the realistic behavior of both the cylinder and dome, two layers of reinforcement are provided in longitudinal and hoop directions. The nonlinear behavior of concrete is incorporated by considering the stiffness degradation using the concrete damage plasticity model. With the increasing pressure, the concrete goes on degrading and thus initiates the yielding of concrete. The location of the first yield of reinforcement is identified. In addition, the ultimate pressure capacity of the containment is found to be 0.22 MPa where tension cracks will be developed almost in the whole containment structure and after that load will be taken by steel only.

Article

A Research Summary on Combined Peaking Load Strategies of Nuclear Power Plant

July 2014 · Advanced Materials Research

Based on extensive research, introduced the peak load regulation characteristics and capacity of different nuclear power plant (NPP) in this paper. The running mode of NPP participating in peak load regulation of power system, combined operation tactics of NPP with other peaking power source and synergistic scheduling of an integrated power generation system with wind, photovoltaic, energy ... [Show full abstract] storage unit and NPP were summarized, technology development trend of NPP participating in peak load regulation of power system was analyzed and forecasted.

Technical Report

Full-text available

Seismological Monitoring in Lithuania – 2004

May 2005

Seismological Monitoring of Lithuania has been carried out since 1999 and continued in 2004 by the Geological Survey of Lithuania (LGT). The data of the Seismological Monitoring System of the Nuclear Power Plant (NPP) were collected and processed. The resulting seismic bulletins were submitted to the International Seismological Centre (Berkshire, U.K.) on a regular basis. One hundred twenty-nine ... [Show full abstract] distant, eight regional and three local events were identified in 2004 (Fig. 1). The majority of the registered seismic events by the Ignalina Seismological Monitoring System were associated with events reported in a bulletin of the US Geological Survey (USGS).

Article

Effects of buildings and complex terrain on radionuclides atmospheric dispersion

January 2014

Evaluation of atmospheric dispersion factors for nuclear power plant environmental impact assessment are usually based on the regulations of CNCAN, the regulatory body in Romania. However, the presence of tall buildings and for sites in complex terrain, especially for low wind speed and calm conditions, it is needed to evaluate the validity and conservation of atmospheric dispersion model and ... [Show full abstract] parameters. This paper aims to evaluate the effects of reactor building and site complex topography upon the dilution factor at Cernavodǎ NPP site.