Prediction of Potential Offsite TEDE, Excess Cancer Risk, Dominant Exposure Pathways and Activity Concentration for Hypothetical Onsite Soil Contamination At the Proposed Rooppur Nuclear Power Plant

2020 ◽  
Author(s):  
Md. Ashraful Islam ◽  
Md. Hossain Sahadath
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Cancer Risk ◽  
Soil Contamination ◽  
Nuclear Power ◽  
Activity Concentration ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Exposure Pathways ◽  
Excess Cancer Risk

Abstract The present study evaluates the potential offsite radiological hazards by calculating Total Effective Dose Equivalent (TEDE) & Excess Cancer Risk if onsite soil contamination occurs at the proposed Rooppur Nuclear Power Plant (RNPP) site, Bangladesh. The assessment was perform assuming a hypothetical soil contamination associated with Fukushima Nuclear disaster with the help of the RESRAD (Residual Radioactivity) OFFSITE computer program developed by Argonne National Laboratory, USA. Six radionuclides namely Cs-134, Cs-136, Cs-137, La-140, Te-129m and Sr-90 has been considered. The maximum TEDE was found to be approximately 2.8 mSv/yr and the maximum total excess cancer risk was found to be 3.25×10-3. The number of dominant exposure pathways and maximum contributor pathways and duration of dominance of different nuclides has been identified. Ingestion of fish is identified as the principal pathway to both TEDE and excess cancer risk. Time variation of activity concentration and dose/source ratio has also been studied.

In situ gamma spectrometry using portable HPGe detector. Radiological characterization and environmental surveillance around an operating nuclear power plant. Possibilities and limits

2021 ◽  
Author(s):  
Jose Angel Corbacho ◽  
A Baeza
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Gamma Spectrometry ◽  
Nuclear Power ◽  
Power Plants ◽  
Activity Concentration ◽  
Versatile Tool ◽  
Ge Detector ◽  
Radiological Characterization

Abstract In situ technique for measuring radionuclides in the soil using a portable Ge detector is a highly versatile tool for both the radiological characterization and for the monitoring of operating nuclear power plants. The main disadvantage of this technique is related to the lack of knowledge of the geometry of the source whose activity concentration is to be determined. However, its greatest advantage is the high spatial representability of the samples and the lower time and resource consumption than gamma spectrometry lab measurements. In this study, the possibilities and limits offered by in situ gamma spectrometry with a high resolution gamma portable detector in two common uses are shown: First, the radiological background characterization and its relationship with the geology of an area of 2700 km2 are assessed; Secondly, its potential for monitoring man-made activity concentration in soils located around an operating nuclear power plant in Spain for surveillance purposes is evaluated. Finally, high accuracy radiation maps have been prepared from the measurements carried out. These radiation maps are essential tools to know the radioactive background of an area, especially useful to assess artificial radioactive deposits produced after a nuclear accident or incident.

scholarly journals STUDIES OF 137CS TRANSFER IN SOIL‐FERN SYSTEM

2005 ◽  
Vol 13 (3) ◽  
pp. 97-102 ◽  
Author(s):  
Donatas Butkus ◽  
Marina Konstantinova
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Transfer Factor ◽  
Nuclear Power ◽  
Activity Concentration ◽  
Root Systems ◽  
137Cs Activity ◽  
Chernobyl Nuclear Power Plant ◽  
Activity Concentrations ◽  
Better Than

Fern accumulates radionuclides in abundance, including 137Cs. Tranfer of 137Cs and 40K in plants which have different root systems (fern or grass), or have no roots at all (moss) was compared. Samplings were performed in regions contaminated with 137Cs after Chernobyl Nuclear Power Plant (ChNPP) accident in 1994 and 1997–2000. The male fern (Dryopteris filix‐mas) most prevailing in Lithuania was studied. Fern accumulates 137Cs more effectively than grass or moss. The average 137Cs activity concentration in fern is 180±60 Bq kg−1 and the transfer factor is 0,074 m2kg−1. The fern stipe accumulates 137Cs most of all (200±90 Bqkg‐1), the transfer factor is 0,087 m2 kg−1. Accumulation of 137Cs is influenced by the content of K in the soil. 137Cs and 40K activity concentrations in fern are higher than those in the soil what shows that fern accumulates 137Cs better than 40K. Fern can clean the soil because this plant accumulates radionuclides in its stipe rather than roots.

Findings From an Operator-In-The-Loop Study on System Overview Displays in a Modernized Nuclear Power Plant

2018 ◽  
Vol 62 (1) ◽  
pp. 1658-1662
Author(s):  
Ronald L. Boring ◽  
Thomas A. Ulrich ◽  
Roger Lew
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
National Laboratory ◽  
Control Room ◽  
Idaho National Laboratory ◽  
Load Following ◽  
Extensive Training ◽  
Systems Simulation ◽  
Visual Fixations

The second Operator Study of System Overviews (OSSO-2) was conducted with a three-person reactor operator crew in the Human Systems Simulation Laboratory (HSSL) at Idaho National Laboratory (INL) in August, 2017. The study supported control room modernization at a nuclear power plant and featured a benchmark comparison of three variants of a turbine control system (TCS): the existing analog TCS, a proposed standalone digital TCS with two displays, and the digital TCS with the addition of a third display depicting a system overview screen. TCS prototypes were developed at INL to allow evaluation of operator performance and preferences during realistic turbine scenarios in the full-scope simulator. The study revealed that completion of turbine startup was several minutes faster with the digital TCS variants than with the conventional analog TCS. Eye tracking revealed visual fixations were more widely distributed in the overview vs. standalone TCS condition, suggesting the overview screen may have cued reactor operators to verify values across the boards. Reviewing key plant parameters showed smoother transitions during load following for the digital vs. analog TCS. The study provides evidence that the new digital TCS could be used successfully by operators without extensive training or rewriting of the operating procedures, suggesting high usability for the digital TCS design. Further advantages were realized through the addition of the system overview screen to provide crews with at-a-glance indicators of key turbine parameters.

scholarly journals Strontium-90 activity concentration in soil samples from the exclusion zone of the Fukushima daiichi nuclear power plant

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Sarata Kumar Sahoo ◽  
Norbert Kavasi ◽  
Atsuyuki Sorimachi ◽  
Hideki Arae ◽  
Shinji Tokonami ◽  
...  
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Activity Concentration ◽  
Soil Samples ◽  
Exclusion Zone ◽  
Strontium 90 ◽  
Fukushima Daiichi
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