Abstract: According to the present invention, there is provided a method of determining a concentration of uranium including: a) a primary measuring step of measuring luminescence intensity or luminescence attenuation of uranium (VI) of an oxidant added sample obtained by adding an oxidant composition to a detection target sample; b) a secondary measuring step of adding different volumes of standard solution containing uranium (VI) having a predetermined concentration to a plurality of oxidant added samples, respectively, and then measuring luminescence intensity or luminescence attenuation of uranium (VI) contained in each standard solution added sample; and c) a calculating step of calculating a concentration of uranium (VI) contained in the detection target sample by a standard addition method based on the primary and secondary measurements. With the method for determining a concentration of uranium according to the present invention, the concentration of uranium may be further rapidly and accurately analyzed.

Abstract: System and method for detecting and/or predicting in a field the leakage of nuclear reactor coolant that may occur at the pressure boundary of the primary system of a nuclear reactor. The system and method for detecting the leakage of nuclear reactor coolant uses a laser induced emission spectrum. The leakage of coolant is detected by detecting boron (B), a main component of the coolant, in corrosive products generated at the nuclear reactor pressure boundary on the basis of laser spectroscopy. An embodiment of the system for detecting leakage of nuclear reactor coolant may include a laser generator, a laser focusing lens, an emission collector, and emission spectrum analyzer.

Abstract: Disclosed herein is a method of quantitatively analyzing uranium in an aqueous solution, the method comprising measuring Raman scattering intensity of water and luminescence intensity of uranium standard solutions having various concentrations (Operation 1); calculating a ratio of the uranium luminescence intensity to the Raman scattering intensity of water for each uranium concentration and plotting a calibration curve therethrough (Operation 2); and measuring Raman scattering intensity of water and uranium luminescence intensity of an unknown sample, calculating a ratio of the measured intensities and determining a uranium concentration thereof by using the calibration curve (Operation 3). When the quantitative analysis method of uranium in an aqueous solution according to the present invention is used, inconvenience of a typical analysis method, in which repetitive measurements of calibration curves are required according to various measurement conditions, may be removed.

Abstract: According to the present invention, there is provided a method of determining a concentration of uranium including: a) a primary measuring step of measuring luminescence intensity or luminescence attenuation of uranium (VI) of an oxidant added sample obtained by adding an oxidant composition to a detection target sample; b) a secondary measuring step of adding different volumes of standard solution containing uranium (VI) having a predetermined concentration to a plurality of oxidant added samples, respectively, and then measuring luminescence intensity or luminescence attenuation of uranium (VI) contained in each standard solution added sample; and c) a calculating step of calculating a concentration of uranium (VI) contained in the detection target sample by a standard addition method based on the primary and secondary measurements. With the method for determining a concentration of uranium according to the present invention, the concentration of uranium may be further rapidly and accurately analyzed.

Abstract: A method for treating neutrons generated from spent nuclear fuel is provided, which includes a step of injecting neutron absorption material into the spent nuclear fuel storage water in which cooling function is lost. Accordingly, as the neutron absorption material in the form of particles is injected into a spent nuclear storage pool missing cooling function and deposited on the surface of the spent nuclear fuel, the possibility reaching nuclear criticality is reduced since the neutrons generated from spent nuclear fuel are absorbed. Also, immediate neutron absorbing power is provided upon refilling the pool water into the spent nuclear fuel storage pool in which pool water is depleted.

Abstract: Disclosed herein is a method of quantitatively analyzing uranium in an aqueous solution, the method comprising measuring Raman scattering intensity of water and luminescence intensity of uranium standard solutions having various concentrations (Operation 1); calculating a ratio of the uranium luminescence intensity to the Raman scattering intensity of water for each uranium concentration and plotting a calibration curve therethrough (Operation 2); and measuring Raman scattering intensity of water and uranium luminescence intensity of an unknown sample, calculating a ratio of the measured intensities and determining a uranium concentration thereof by using the calibration curve (Operation 3). When the quantitative analysis method of uranium in an aqueous solution according to the present invention is used, inconvenience of a typical analysis method, in which repetitive measurements of calibration curves are required according to various measurement conditions, may be removed.

Abstract: System and method for detecting and/or predicting in a field the leakage of nuclear reactor coolant that may occur at the pressure boundary of the primary system of a nuclear reactor. The system and method for detecting the leakage of nuclear reactor coolant uses a laser induced emission spectrum. The leakage of coolant is detected by detecting boron (B), a main component of the coolant, in corrosive products generated at the nuclear reactor pressure boundary on the basis of laser spectroscopy. An embodiment of the system for detecting leakage of nuclear reactor coolant may include a laser generator, a laser focusing lens, an emission collector, and emission spectrum analyzer.

Abstract: The present invention relates to an apparatus and method for measuring the size of nanoparticles present in an aqueous solution as an infinitesimal quantity, and, more particularly, to a scheme that remotely measures the laser-induced breakdown of a fine nanoparticle using a probe beam in a non-contact manner, performs curve fitting on the symmetrical frequency distribution curve of the measured magnitude of a probe beam signal to form the shape of a Gaussian function, obtains calibration curves for the size of the nanoparticle from the peak and full-width at half-maximum thereof, and determines the size of an unknown nanoparticle from the calibration curves.

Abstract: A stable DC power system of high-voltage and good-output performance is provided by adding a 3-phase inverter, whereby modified waveform for an output control is produced and a filter to a conventional DC power system and by bridge-rectifying. The modified sinusoidal wave such as a varied wave whose upper portion ranging from 30.degree. to 150.degree. is flat of a 1/2 cycle of the sinusoidal wave, a modified wave whose portions ranging from 30.degree. to 90.degree. and from 90.degree. to 150.degree. are linear in a 1/2 cycle of the sinusoidal wave and a modified wave whose portions ranging from 30.degree. to 90.degree. and from 210.degree. to 270.degree. are recessed so as to be symmetrical with respect to a line in the whole cycle of the sinusoidal wave are used for reducing ripples of the output voltage after the 3-phase rectification.