scholarly journals Monitoring of biomass at Cooling Water System of hongyanhe nuclear power plant by using acoustic methods

2020 ◽  
Vol 194 ◽  
pp. 01007
Author(s):  
WANG Zi ◽  
TANG Yong ◽  
FU Yuanyuan ◽  
MENG Wei ◽  
WANG Shuai ◽  
...  
Keyword(s):  
Water Intake ◽  
Nuclear Power ◽  
Large Scale ◽  
Meteorological Data ◽  
Normal Operation ◽  
Target Strength ◽  
Monitoring Point ◽  
Daily Average ◽  
Cold Source ◽  
Average Flux

In recent years, there have been large-scale jellyfish outbreaks in the Bohai Sea in summer, which have greatly affected the water intake for cold source of Hongyanhe nuclear power station in Fuzhou bay and threatened the normal operation. This study aims at early warning of invasion of jellyfish, designs and develops acoustic monitoring system for cold source biological (jellyfish)by using ascientificechosounder (EY60,70kHz,Simrad), and carries out real-time monitoring of the echo of cold source biological entering water intake, so as to obtain the resource density of jellyfish from June to September 2019. The acoustic data is processed with a software of Echoview to calculate the average SV and detect the strength of the single target to calculate the daily average flux of the monitoring point. According to the monitoring results, the maximum and minimum daily average values of SV were -62.7dB and -80.0dB, respectively. The maximum and minimum daily average values of target strength are -37.2dB and -81.0dB, respectively. The maximum and minimum daily average values of flux are 5.36ind/(s•m2) and 1.2x10-5ind/(s•m2).Combined with the daily cleaning amount of the monitoring point back-end intercepting network and meteorological data, the comparative analysis is carried out to determine the index level of the acoustic warning for cold source biological flowing into the water intake according to the correlation between average flux and amount of cleaned net.

scholarly journals Acoustic Evaluation of Fishery Resources in Seawater Reservoir and Water-Intake Open Channel of Taishan Nuclear Power Plant

2020 ◽  
Vol 194 ◽  
pp. 01021
Author(s):  
MENG Wei ◽  
LIU Xiaolin ◽  
TANG Yong ◽  
WANG Shuai ◽  
ZHANG Jinfei
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Water Intake ◽  
Nuclear Power ◽  
Large Scale ◽  
Open Water ◽  
Survey Area ◽  
Fish Spawning ◽  
Acoustic Evaluation ◽  
The Impact

The CGN Taishan NPP seawater storage is a land-sealed type and is connected to the open water intake channel of Dajin Island in the open sea through a subsea tunnel. Due to the impact of large-scale facility aquaculture in the nearby seas, fish spawning grounds have been formed in this area, and fish breeds faster. A large number of fish have impacted on safe operation of nuclear power. In response to this situation, this study conducted acoustic navigation surveys of fish resources in most waters of the “Sea Reservoir” and “Water intake channel”, using broadband scientific fish finder system (EK80, 120kHz, 200kHz) produced by Norwegian Simrad Company. Evaluation of acoustic resources using echo integration method. The survey scope of seawater storage in this survey is from the entrance to the first barrier (around a distance of 760m) and from the first barrier to a second barrier (around a distance of 220m); the survey distance of the water intake channel is about 1460m. From the echo image, it can be found that the zooplankton in the sea reservoir is much smaller than the water intake channel, and the fish size of the water intake channel is much larger than that of the sea channel.Acoustic data was processed and analyzed using Echoview software to calculate the average SV and detect the strength of the single target. The results show that in the survey area of the Taishan Nuclear Power Plant Hai Reservoir, the total number of fish is about 1.38 million, the total weight is about 13.6 tons, and the fish with a body length of less than 20cm is the majority, and there are fewer large-sized fish; The total resources in the survey area is about 47 tons, with a total number of 27 million, and has a high density.

scholarly journals Research on the detection and early warning technology of harmful marine organisms in the water intake of nuclear power plant by 3D image sonar

2021 ◽  
Vol 290 ◽  
pp. 03013
Author(s):  
Jianfei Zhang ◽  
Zhongpeng Wu ◽  
Chong An
Keyword(s):  
Water Intake ◽  
Early Warning ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Marine Organisms ◽  
Industrial Safety ◽  
Biological Information ◽  
Marine Biological ◽  
Cold Source

In view of the frequent water intake blockage caused by marine biological invasion in many nuclear power plants, which affects the safety of cold source in nuclear power plants, a defense system in depth including marine biological identification, detection, early warning and hierarchical response is established through investigation and analysis of the causes of the event. Underwater acoustic high-resolution multi beam detection method is used to detect jellyfish, hairy shrimp and other marine organisms, The echo characteristics are obtained, the distribution density in sensitive sea area is analyzed, and the effective early warning judgment is given. Among them, detection and early warning is the front-end disposal measure, which can provide accurate and timely marine biological information for the subsequent hierarchical response. At the same time, it can replace the underwater inspection work of divers, reduce the risk of divers, reduce the risk of industrial safety, and improve the reliability of cold source.

scholarly journals Fixed Point Acoustic Monitoring Investigation Report for Marine Biological Resources in an Open Water Channel of Taishan Nuclear Power Plant

2020 ◽  
Vol 194 ◽  
pp. 01033
Author(s):  
XU Chuan ◽  
HU Zhengchun
Keyword(s):  
Nuclear Power ◽  
Marine Organism ◽  
Water Channel ◽  
Fish Larva ◽  
Open Water ◽  
Acoustic Monitoring ◽  
Beam Direction ◽  
Monitoring Point ◽  
Cold Source ◽  
Investigation Report

To disclose changes of density of fish larva and other marine organisms in an open water channel before the open net interceptor, this acoustic monitoring point was determined in front of the first open net interceptor in the open seawater channel with considerations to monitoring functions of EK80 scientific echometer to various cold-source organism and the marine organism recovery efficiency of open net interceptor. The beam direction was perpendicular downward. Floating marine organism enters into the interceptor after passing through the acoustic beam, while the quantity of swimming fish larva into the interceptor is smaller under normal marine conditions since they have certain swimming ability.

scholarly journals Assessment of radiation dose caused by radioactivegaseous effluent releasedfrom nuclear power plant Ninh Thuan 1 under scenario of normal operation

2014 ◽  
Vol 4 (4) ◽  
pp. 9-16
Author(s):  
Xuan Anh Do ◽  
Dinh Cuong Le ◽  
Duc Thang Duong ◽  
Thu Bac Vuong ◽  
Thi Thu Ha Nguyen ◽  
...  
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Meteorological Data ◽  
Nuclear Regulatory Commission ◽  
Normal Operation ◽  
Wind Rose ◽  
North East ◽  
Radioactive Nuclides ◽  
Regulatory Commission

Based on guides RG 1.109, RG 1.111 published by United States Nuclear Regulatory Commission (USNRC) our research concentratesinassessing radiation doses caused by radioactive substances released from the nuclear power plant (NPP) Ninh Thuan 1 under the scenario of normal operation using software package NRCDose72 provided by the USNRC. The database including the released radioactive nuclides, meteorology, terrain, population and agricultural production activities have beencollectedand processed to build the input data for the model calculation. The wind rose distribution obtained from the meteorological data in a five-year period from 2009-2013 showed that the radioactive nuclides released to environment spread in two main wind directions which are North East and South West. The X/Q (s/m3) and D/Q (s/m2) qualities which are, respectively, the ratio of activity concentration to release rateand that of deposition density of radioactive nuclides to release rate were calculated within an area of 80 km radius from the NPP site using XOQDOQ. Population doses were calculated using GASPAR. The XOQDOQ and GASPAR are two specific softwares in NRCDose72 package.

Field Methods for Studying the Radiation Situation in the Area of the Belarusian NPP in the Pre-Operational Period

ANRI ◽  
2020 ◽  
pp. 31-44
Author(s):  
Aleksey Ekidin ◽  
Aleksey Vasil'ev ◽  
Maksim Vasyanovich ◽  
Evgeniy Nazarov ◽  
Mariya Pyshkina ◽  
...  
Keyword(s):  
Dose Rate ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Field Studies ◽  
Radiation Monitoring ◽  
Normal Operation ◽  
Construction Site ◽  
External Radiation ◽  
Field Methods

The article presents the results of field studies in the area of the Belarusian NPP in the pre-operational period. The «background» contents of gamma-emitting radionuclides in individual components of the environment are determined. The main array of dose rate measurements in the area of the NPP construction site is in the range 0.048 ÷ 0.089 μSv/h. External radiation in the surveyed area is formed at 96% due to 40K, 226Ra and 232Th. The information obtained can be used to correctly interpret the data of future radiation monitoring during normal operation of nuclear power plants.

scholarly journals On the Root Causes of the Fukushima Daiichi Disaster from the Perspective of High Complexity and Tight Coupling in Large-Scale Systems

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 414
Author(s):  
Atsuo Murata ◽  
Waldemar Karwowski
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Large Scale ◽  
High Complexity ◽  
Tight Coupling ◽  
Large Scale Systems ◽  
Safety Issues ◽  
Loss Of Coolant ◽  
Station Blackout ◽  
Fukushima Daiichi

This study explores the root causes of the Fukushima Daiichi disaster and discusses how the complexity and tight coupling in large-scale systems should be reduced under emergencies such as station blackout (SBO) to prevent future disasters. First, on the basis of a summary of the published literature on the Fukushima Daiichi disaster, we found that the direct causes (i.e., malfunctions and problems) included overlooking the loss of coolant and the nuclear reactor’s failure to cool down. Second, we verified that two characteristics proposed in “normal accident” theory—high complexity and tight coupling—underlay each of the direct causes. These two characteristics were found to have made emergency management more challenging. We discuss how such disasters in large-scale systems with high complexity and tight coupling could be prevented through an organizational and managerial approach that can remove asymmetry of authority and information and foster a climate of openly discussing critical safety issues in nuclear power plants.

Agricultural Land Management Options Following Large-Scale Environmental Contamination: Evaluation for Fukushima Affected Agricultural Land

2013 ◽  
Author(s):  
Hildegarde Vandenhove
Keyword(s):  
Land Use ◽  
Land Management ◽  
Nuclear Power ◽  
Large Scale ◽  
Agricultural Land ◽  
Agricultural Practices ◽  
Management Option ◽  
Management Options ◽  
Fukushima Daiichi ◽  
Agricultural Land Management

The accident at the Fukushima Daiichi Nuclear Power Plant has raised questions about the accumulation of radionuclides in soils, the transfer in the foodchain and the possibility of continued restricted future land use. This paper summarizes what is generally understood about the application of agricultural countermeasures as a land management option to reduce the radionuclides transfer in the food chain and to facilitate the return of potentially affected soils to agricultural practices in areas impacted by a nuclear accident.

Component and Integration Test of an FPGA-Based PWR Protection Sub-System Using UVM

2017 ◽  
Author(s):  
Xuanxuan Shui ◽  
Yichun Wu ◽  
Junyi Zhou ◽  
Yuanfeng Cai
Keyword(s):  
Nuclear Power ◽  
Power Industry ◽  
Nuclear Power Industry ◽  
Normal Operation ◽  
Static Timing Analysis ◽  
Specific Test ◽  
Pressurized Water ◽  
Safety Margins ◽  
Integration Test ◽  
Test Process

Field programmable gate arrays (FPGAs) have drawn wide attention from nuclear power industry for digital instrument and control applications (DI&C), because it’s much easier and simpler than microprocessor-based applications, which makes it more reliable. FPGAs can also enhance safety margins of the plant with potential possibility for power upgrading at normal operation. For these reasons, more and more nuclear power corporations and research institutes are treating FPGA-based protection system as a technical alternative. As nuclear power industry requires high reliability and safety for DI&C Systems, the development method and process should be fully verified and validated. For this reason, to improve the application of FPGA in NPP I&C system, the specific test methods are critical for the developers and regulators. However, current international standards and research reports, like IEC 62566 and NUREG/CR-7006, which have demonstrated the life circle of the development of FPGA-based safety critical DI&C in NPPs, but the specific test requirements and methods which are significant to the developers are not provided. In this paper, the whole test process of a pressurized water reactor (PWR) protection sub-system (Primary Coolant Flow Low Protection, Over Temperature Delta T Protection, Over Power Delta T Protection) is described, including detail component and integration tests. The Universal Verification Methodology (UVM) based on System Verilog class libraries is applied to establish the verification test platform. All these tests are conducted in a simulation environment. The test process is driven by the test coverage which includes code coverages (i.e., Statement, Branch, Condition and Expression, Toggle, Finite State Machine) and function coverage. Specifically, Register Transaction Level (RTL) simulation is conducted for Component tests, while RTL simulation, Gate Level simulation, Timing simulation and Static timing analysis are conducted for the integration test. The issues (e.g., the floating point calculation, FPGA resource allocation and optimization) arose in the test process are also analyzed and discussed, which can be references for the developers in this area. The component and integration tests are part of the Verification and Validation (V&V) work, which should be done by the V&V team separated from the development team. The testing method could assure the test results reliable and authentic. It is practical and useful for the development and V&V of FPGA-based safety DI&C systems.

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