Hybrid heat pipe based passive cooling device for spent nuclear fuel dry storage cask

Jeong, Yeong Shin; Bang, In Cheol

doi:10.1016/j.applthermaleng.2015.11.086

Cited by 37 publications

(15 citation statements)

References 9 publications

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“…As an innovative design of spent fuel dry storage cask design extending thermal margin and limited volumetric storage capacity, UCAN (UNIST CANister), equipped with hybrid control rod-heat pipe was proposed as shown in Figure 1. 6 UCAN is a dual-purpose metal dry storage cask design having storage capacity of 21 PWR fuel assemblies (PLUS7 fuel assembly) with cask body of 2.1 m diameter, 5.3 m height and 0.2 m thickness. Diameter and height of dry shielded canister, which is container of fuel assemblies and helium gas, is 1.7 m and 4.9 m, respectively, with 0.025 m thickness.…”

Section: Introductionmentioning

confidence: 99%

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Effective energy management design of spent fuel dry storage based on hybrid control rod‐heat pipe

Kim

Bang

2020

Int J Energy Res

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Spent fuel dry storage cask, which stores the spent fuel from wet storage facility to final processing, has been developed and managed. Even though thermal management mechanisms of dry storage casks secure the thermal integrity of the cask, improvement of thermal management capacity of dry storage cask would enhance thermal margin against unforeseen off-normal conditions with increasing specific storage capacity. Ulsan National Institute of Science and Technology (UNIST) CANister (UCAN) utilizing the new-type thermosyphon heat pipe, is under development as an advanced design of spent fuel dry storage cask. Hybrid control rod-heat pipe, which is an annular thermosyphon by containing neutron absorber, is a key component of UCAN. Heat removal performance of the hybrid control rod-heat pipe was analyzed bya series of experiment withtest facility simulating single fuel assembly with full height. The UCAN fuel assembly showed the reduced structural and fuel temperatures compared to bare fuel assembly of conventional cask designs, exhibitingimproved thermal margin. According to experimentally observed heat removal rate of the hybrid control rod-heat pipe, UCAN design could extend manageable thermal capacity from 13.3% to 33.8%. The removeddecay heat through hybrid control rod-heat pipe could be reused in electricity generation with stirling engine and thermoelectric devices improving energy management efficiency. Intermittent boiling accompanying geyser phenomena was frequently occurred inside the test section, and the boiling behaviors according to fill ratios (FRs) and operating pressures dominated the heat removal performances. The hydrostatic pressure owing to large aspect ratio affected differentiated thermal-hydraulic behaviors compared to conventional thermosyphons. To develop heat transfer and hydraulic models of the hybrid control rod-heat pipe, geyser phenomenon inside the test section wasdiscussed physically. This workexhibited the feasibility of UCAN design and provides fundamental physics on intermittent boiling of thermosyphon operating at sub-atmospheric pressures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effective energy management design of spent fuel dry storage based on hybrid control rod‐heat pipe

Kim

Bang

2020

Int J Energy Res

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“…In the nuclear field, the heat pipe is considered and proposed to be used as a passive cooling system, such as loop heat pipe [9][10][11][12]; two-phase closed thermosyphon loop [12,13]; hybrid heat pipe [14][15][16][17]; variable conductance heat pipe [18]; heat pipe radiator [19]; sodium heat pipe [20]; and vertical straight wickless-heat pipe [21][22][23][24]. The results of heat pipe investigation showed that heat pipe with demineralized water working fluid has good thermal performance to remove the heat generation and it could be proposed to be used as passive cooling system in nuclear installation when accident occurred.…”

Section: Introduction mentioning

confidence: 99%

Investigation on the Performance of a Wickless-Heat Pipe Using Graphene Nanofluid for Passive Cooling System

et al. 2019

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To enhance the thermal safety in case of station blackout, a wickless-heat pipe is proposed as an alternative passive cooling system technology to remove decay heat generation in the nuclear spent fuel storage pool. The objectives of this research are to investigate the heat transfer phenomena in vertical straight wicklessheat pipe using Graphene nanofluid working fluid and to study the effect of Graphene nanofluid on the vertical straight wickless-heat pipe thermal performance. The investigation was conducted in 6 meters height and 0.1016 m inside diameter of vertical straight wickless-heat pipe. In this research, the Graphene nanofluid with 1 % of weight concentration was used as working fluid. The effect of working fluid filling ratio, evaporator heat load, and coolant volumetric flow rate on the water jacket were studied. The results showed that the heat transfer phenomena, which were indicated by an overshoot, zigzag, and stable state, were observed. Based on thermal resistance obtained, it was shown that the vertical straight wickless-heat pipe charged with the Graphene nanofluid has a lower thermal resistance compared to one with demineralized water. The thermal resistance of vertical straight wickless-heat pipe using Graphene nanofluid and demineralized water were 0.015 °C/W and 0.016 °C/W, respectively. While the best thermal performance was achieved at a filing ratio of 80 %, higher heat load, and higher coolant volumetric flow rate. It can be concluded that Graphene nanofluid could enhance the thermal performance of vertical straight wickless-heat pipe.

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“…The conclusion from these analyses is that the application of PCM allows them to maintain a constant thermal power level of the nuclear reactor. Jeong and Bang [5] proposed the use of the PCM tank in a hybrid heat pipe system. A hybrid heat pipe removes decay heat from a spent nuclear fuel (SNF).…”

Section: Introductionmentioning

confidence: 99%

The thermal behaviour of a special heat exchanger filled with the phase change material dedicated for low – temperature storage applications

Ochman

Pietrowicz

2019

EPJ Web Conf.

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The work deals with an experimental and theoretical analysis of a special heat exchanger filled with the PCM (Phase Change Material) mixture of paraffin wax capsuled in the melamine-formaldehyde membrane and water, dedicated to low-temperature storage applications. In the first part of the article, the PCM topic was introduced. The next part consists information about the designed and manufactured special heat exchanger with the PCM. During the experiment as a PCM is utilized mixture of paraffin wax in microcapsules within the water. The experimental results of temperature distributions and stored energy in the heat exchanger were compared with the theoretical model proposed in the literature. In the discussion section, the authors describe a new idea of the PCM storage tank application, which could be applied e.g. in nuclear facilities.

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Hybrid heat pipe based passive cooling device for spent nuclear fuel dry storage cask

Cited by 37 publications

References 9 publications

Effective energy management design of spent fuel dry storage based on hybrid control rod‐heat pipe

Effective energy management design of spent fuel dry storage based on hybrid control rod‐heat pipe

Investigation on the Performance of a Wickless-Heat Pipe Using Graphene Nanofluid for Passive Cooling System

The thermal behaviour of a special heat exchanger filled with the phase change material dedicated for low – temperature storage applications

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