Experimental and theoretical justification of passive heat removal system for irradiated fuel assemblies of the nuclear research reactor in a spent fuel pool

Thuong, Ta Van; Ташлыков, О. Л.; Glukhov, S.M.; Shumkov, D. E.; Volchikhina, YuV.

doi:10.1016/j.net.2023.02.028

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…In addition, the authors summarized some key content points that Vietnam needs to pay attention to in connection with the issue of "Limitation and control of the dose and risk" during the appraisal of the EIA report: exposure control in case of radiative and nuclear accidents and other special cases [28]; assessment and control of potential exposure; assessment by tiered approach; cumulative impact assessment; transboundary impact assessment; rules for the management of waste and used radioactive sources; rules for preparedness and response to radiative and nuclear incidents; radiation monitoring of the environment. At the same time, it is necessary to pay attention to the technical standards/rules applied in the analysis of environmental samples: analysis of radionuclides in soil, water, air, plants, and food samples (Fig.…”

Section: Resultsmentioning

confidence: 99%

Preparation of guidance on the appraisal of the environmental impact assessment report for the center for nuclear science and technology of Vietnam

2023

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At present, Viet Nam is intensifying work on the preparation of the construction of the Center for Nuclear Science and Technology (CNST) with a new research reactor (10 MWt capacity, with the possibility of increasing the capacity to 15 MWt). The implementation of this project will improve Vietnam’s nuclear infrastructure and will become a reliable stepping-stone for the further development of nuclear energy. The main tasks of the CNST are solving tasks in the field of science, engineering, and technology; conducting research in the field of production of radioisotopes for medical and industrial purposes, conversion of materials, and reactor materials science; conducting fundamental and applied research in nuclear physics, experimental research in physical processes; training and advanced training of personnel in the field of nuclear energy. This article presents and analyzes the legal system of Vietnam on environmental protection, up-to-date documents related to the environmental impact assessment (EIA) of Vietnam and international organizations. Issues requiring attention related to the EIA on the radiological aspect during the implementation of the CNST project at the construction stage, trial, and normal operation are considered. The structure of Guidance on the appraisal of the EIA report (GAR EIA) for Vietnam’s CNST project is presented.

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Section: Resultsmentioning

confidence: 99%

Preparation of guidance on the appraisal of the environmental impact assessment report for the center for nuclear science and technology of Vietnam

2023

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“…This generally includes systems that use the environment as the ultimate heat sink for cooling without active components. The applications are diverse and range from cooling systems for buildings 3 – 5 , the cooling of lithium batteries 6 , 7 and photovoltaic cells 8 , 9 to the fail-safe cooling of spent-fuel pools in a nuclear power plant 10 – 13 . One representative of these systems is the two-phase closed thermosiphon (TPCT) 14 .…”

Section: Introductionmentioning

confidence: 99%

Enhancing heat transfer at low temperatures by laser functionalization of the inner surface of metal pipes

Holder,

Peter,

Kirsch

et al. 2024

Sci Rep

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The latent heat transfer during vapour condensation in the condenser section of passive heat transport devices such as the two-phase closed thermosiphon is limited by film condensation. Dropwise condensation provides an increase of the heat transfer coefficient by up to one order of magnitude and can be achieved with a water-repellant surface. The inner surface of pipes made from stainless steel was functionalized by laser surface texturing with ultrashort laser pulses and subsequent storage in a liquid containing long-chained hydrocarbons. The pipes were separated into half-pipes by wire eroding to enable laser texturing of the inner surface, and were then joined by electron beam welding after laser texturing. As a result, superhydrophobic and water-repellent surfaces with a contact angle of 153° were obtained on the inner surface of the pipes with a length of up to 1 m. The functionalized pipes were used in the condenser section of a two-phase closed thermosiphon to demonstrate a heat transfer rate of 0.92 kW at 45 °C, which is approximately three times the heat transfer rate of 0.31 kW of a smooth reference pipe.

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“…Owing to favorable climatic conditions from June 2023 to February 2024 (a decrease in temperature by almost 10 • C, precipitation of about 300 mm, and accumulation of groundwater and surface runoff), water losses from the pool were partially compensated for and the actual drop in the level was 1.15 m for 289 days that was not critical (Figure 7). Owing to favorable climatic conditions from June 2023 to February 2024 (a de in temperature by almost 10 °C, precipitation of about 300 mm, and accumula groundwater and surface runoff), water losses from the pool were partially compe for and the actual drop in the level was 1.15 m for 289 days that was not critical (Fig The water flow rate required to keep the SNF pool temperature constant is evaluated based on the amount of decay heat generated by the FA at any time after shutdown according to the Wey-Wigner formula [31]: (7) where Pd(t) is thermal power generation due to beta and gamma rays, t [s] is the time elapsed since the shutdown, P0 [J•s −1 ] is thermal power before the shutdown, and t0 [s] is time of thermal power level before the shutdown. The amount of heat, Q [J], required to heat water is calculated as…”

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“…Annually, 54-55 spent fuel assemblies (about 25 tons of uranium) are unloaded. According to the Safety Guide developed by the reactor's designers, Pd (t = 0.01 y) for 1 ton of SNF with 4.3% initial enrichment of average burning of 40 GW-day/tU is 1.52 The water flow rate required to keep the SNF pool temperature constant is evaluated based on the amount of decay heat generated by the FA at any time after shutdown according to the Wey-Wigner formula [31]:…”

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Assessment of Spent Nuclear Fuel in Ukrainian Storage System: Inventory and Performance

Dolin,

Lo Frano,

Cancemi

2024

Energies

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It is of meaningful importance to evaluate the performance of all the nuclear facilities, and particularly those part of such buildings where spent nuclear fuel (SNF) is stored to assess what kinds of consequences are anomalous/abnormal or to determine what types of accident events may occur. In this preliminary study, the strategies adopted for the management of SNF, and the risk related to them are discussed. The aim of this study is to evaluate the total radioactivity inventory characterising Ukrainian nuclear facilities, including storage facilities. The dataset used to calculate the total activity associated with nuclear fuel is provided and discussed. For the evaluation, it is considered that a SNF pool in VVER-1000 is designed to store 687 fuel assemblies, and 670 are in VVER-440. When it is half full, which is the case for 15 Ukrainian units, it will store about 2200 tU containing up to 1·1019 Bq of 137Cs, 7·1018 Bq of 90Sr, and 1·1019 Bq of TUE. This study focuses particularly on the total activity of the SNF stored at the Zaporozhye plant, the biggest nuclear plant in Europe, and the risk posed by the potential loss that cooling the plant could incur because of pond water level variation. The results of the analysis of the Zaporozhye NPP behaviour suggest that the water flow rate which keeps the SNF pool temperature constant is about 200,000 m3·day−1. Therefore, the water level in the pond should not be lower than 1.5–2 m; otherwise, the plant will need an additional source of water of more than 200,000 m3 per day to guarantee safe storage of SNF.

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Experimental and theoretical justification of passive heat removal system for irradiated fuel assemblies of the nuclear research reactor in a spent fuel pool

Cited by 5 publications

References 8 publications

Preparation of guidance on the appraisal of the environmental impact assessment report for the center for nuclear science and technology of Vietnam

Preparation of guidance on the appraisal of the environmental impact assessment report for the center for nuclear science and technology of Vietnam

Enhancing heat transfer at low temperatures by laser functionalization of the inner surface of metal pipes

Assessment of Spent Nuclear Fuel in Ukrainian Storage System: Inventory and Performance

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