Assessment of Sr-90 in water samples: precision and accuracy

The study of artificial radionuclides dispersion into the environment is very important to control the nuclear waste discharges, nuclear accidents and nuclear weapons testing. The accidents in Fukushima Daiichi Nuclear Power Plant and Chernobyl Nuclear Power Plant, released several radionuclides in the environment by aerial deposition and liquid discharge, with various level of radioactivity. The 90Sr was one of the elements released into the environment. The 90Sr is produced by nuclear fission with a physical half-life of 28.79 years with decay energy of 0.546 MeV. The aims of this study are to evaluate the precision and accuracy of three methodologies for the determination of 90Sr in water samples: Cerenkov, LSC direct method and with radiochemical separation. The performance of the methodologies was evaluated by using two scintillation counters (Quantulus and Hidex). The parameters Minimum Detectable Activity (MDA) and Figure Of Merit (FOM) were determined for each method, the precision and accuracy were checked using 90Sr standard solutions.

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Determination of the boron concentration of OPR 1000 reactor critical state using the Cosi OPR1000 system

Science and Technology Development Journal ◽

10.32508/stdj.v19i4.681 ◽

2016 ◽

Vol 19 (4) ◽

pp. 241-248

Author(s):

Son An Nguyen ◽

Nguyen Trung Tran ◽

Tuan Quoc Tran ◽

Cuong Quang Ly ◽

Lan Thi Ha Le ◽

...

Keyword(s):

Power Plant ◽

Nuclear Power Plant ◽

Critical State ◽

Nuclear Power ◽

Boron Concentration ◽

Nuclear Fission ◽

Bisection Method ◽

Control Rod ◽

Operating Data

In the operation of a nuclear power plant (NPP), to adjust the capacity of NPP is necessary. When the NPP capacity is changed the nuclear fission is also changed. The methods used in changing the capacity of NPP include: changing the boron concentration, changing the position of the control rod groups, and changing the boron concentrations and the position of the control rod groups together. This report presents some results of the research, measurement boron concentrations when nuclear power plans OPR1000 critically state in the cases of ARO, ARI SB, ARI R1, R5 = 191 cm on the basis of the bisection method in the boron concentrations adjustment. The experiment is performed on core the simulator for OPR 1000 nuclear power plant. The results in the 4 cases were similar with NPP operating data using OPR1000 reactor.

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The Determination of Shock Accelerations on a Small Nuclear Power Plant Structural Elements When Falling to the Surface

Global Nuclear Safety ◽

10.26583/gns-2020-01-01 ◽

2020 ◽

Vol 34 (1) ◽

pp. 7-15

Author(s):

O.A. Gubeladze ◽

A.R. Gubeladze

Keyword(s):

Power Plant ◽

Nuclear Power Plant ◽

Nuclear Power ◽

Structural Elements

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14C Distribution in Atmospheric and Aquatic Environments Around Qinshan Nuclear Power Plant, China

Radiocarbon ◽

10.2458/56.17914 ◽

2014 ◽

Vol 56 (3) ◽

pp. 1107-1114 ◽

Cited By ~ 5

Author(s):

Zhongtang Wang ◽

Dan Hu ◽

Hong Xu ◽

Qiuju Guo

Keyword(s):

Power Plant ◽

Nuclear Power Plant ◽

Water Samples ◽

Nuclear Power ◽

Dissolved Inorganic Carbon ◽

Tap Water ◽

Surface Seawater ◽

Pressurized Water ◽

Specific Activities ◽

Water Reactors

Atmospheric CO2 and aquatic water samples were analyzed to evaluate the environmental 14C enrichment due to operation of the Qinshan nuclear power plant (NPP), where two heavy-water reactors and five pressurized-water reactors are employed. Elevated 14C-specific activities (2–26.7 Bq/kg C) were observed in the short-term air samples collected within a 5-km radius, while samples over 5 km were close to background levels. The 14C-specific activities of dissolved inorganic carbon (DIC) in the surface seawater samples ranged from 196.8 to 206.5 Bq/kg C (average 203.4 Bq/kg C), which are close to the background value. No elevated 14C level in surface seawater was found after 20 years of operation of Qinshan NPP, indicating that the 14C discharged was well diffused. The results of the freshwater samples show that excess 14C-specific activity (average 17.1 Bq/kg C) was found in surface water and well water samples, while no obvious 14C increase was found in drinking water (groundwater and tap water) compared to the background level.

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