Lithium fire protection design approach in IFMIF-DONES facility

D'Ovidio, Gianluca; Martín-Fuertes, F.; Marugán, Juan Carlos; Bermejo, Santiago; Nitti, Francesco

doi:10.1016/j.fusengdes.2023.113446

Cited by 7 publications

(3 citation statements)

References 54 publications

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“…The current design of the DONES Li loop envisages a total Li volume of approximately V Li = 14 m 3 which is considered as a reference value for the following simulations [52]. Unless otherwise noted, the simulations are executed assuming a flow rate through the trap of F trap ≈ 2 × 10 −3 m 3 s −1 , a trap diameter of d trap = 0.15 m and a pebble radius of r peb = 5 × 10 −4 m.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Also in the second scenario, the gettering capacity decreases with increasing temperature. This is attributed to the temperature dependency of K Li−Y D,0 which is visualized in figure 10 and mathematically expresses in equation (52). According to equation (64), in the second scenario the required pebble-bed mass to lower the concentration in Li down to a certain equilibrium value is determined by:…”

Section: Indicates Full Saturation Occurs Only If the Establishing Eq...mentioning

confidence: 99%

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Impact of yttrium hydride formation on multi-isotopic hydrogen retention by a getter trap for the DONES lithium loop

et al. 2023

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Compliance with imposed hydrogen concentration limits in the lithium loop of DONES requires the installation of an yttrium-based hydrogen trap. To determine an appropriate H-trap design, it is essential to have access to a numerical tool capable of simulating hydrogen transport in the DONES lithium loop connected to an yttrium pebble-bed. In the past, a simplified model was created that allows such calculations when hydrogen concentrations in lithium are low. However, in certain DONES operating phases, the concentration in the lithium is high and in a range where yttrium dihydride (YH2) formation is likely. Due to the anticipated great impact of YH2 formation on the H-trap performance a new model is developed that includes the mechanism of hydride formation. It is based on a mathematical reproduction of complete pressure composition-isotherms of the Li-H and Y-H systems. Thus, the conditions that trigger YH2 formation are determined and the variation of hydrogen solubility in different yttrium hydride phases is deduced. An approximate concentration-dependent relationship of hydrogen diffusivity in yttrium is derived and incorporated into the model. Simulations are performed to analyze the dynamics of the concentration decrease during purification of the lithium circuit prior to the experimental DONES phase by varying design parameters of the trap. It is found that hydride formation greatly increases the hydrogen gettering capacity of the H-trap and limits the maximum concentration in the lithium. Indeed, YH2 formation may be purposefully triggered to exploit its beneficial properties for DONES. The simulations show that the H-trap must be replaced at least every 28 days during the DONES experimental phase to meet tritium limits. This work sets the conditions for the required pebble-bed mass of the H-trap at a given temperature to comply with DONES safety requirements. Finally, the model is validated by an accurate numerical reproduction of experimental results.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Indicates Full Saturation Occurs Only If the Establishing Eq...mentioning

confidence: 99%

Impact of yttrium hydride formation on multi-isotopic hydrogen retention by a getter trap for the DONES lithium loop

et al. 2023

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“…Therefore, the volume flow rate through the main loop is set to F main = 1×10 −1 m 3 /s. The current design of the DONES lithium loop envisages a total lithium volume of approximately V Li = 14 m 3 which is considered as a reference value for the following simulations [280]. Unless otherwise noted, the simulations are executed assuming a flow rate through the trap of F trap ≈ 2 × 10 −3 m 3 /s, a trap diameter of d trap = 0.15 m and a pebble radius of r peb = 5 × 10 −4 m.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Design of a multi-isotopic hydrogen co- and counter-permeation experiment for HCPB related tritium mitigation studies

Hendricks

Carella

Jiménez

et al. 2022

Fusion Engineering and Design

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Application of the MELCOR for Fusion Code to the Transient Accident Analysis of the IFMIF-DONES Test Cell

Pérez,

D’Ovidio,

Martín-Fuertes

2023

J Fusion Energ

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According to the European Fusion Roadmap, to demonstrate the feasibility of fusion energy, it is necessary to build a comprehensive database of materials properties to be used in future fusion power plants. This is the objective of the IFMIF-DONES facility, which will drive a deuteron beam on a liquid lithium target to produce high energy neutron fluxes for irradiating candidate fusion materials. Among the several ongoing activities in the frame of the EUROfusion Early Neutron Source Work Package (WPENS) project, deterministic accident analyses play an important role, since they help identifying a set of reference accident scenarios and related safety class components. Some of these scenarios are being studied with the MELCOR-fusion code, an integrated engineering code which is able to perform thermal-hydraulic transient calculations. In this work, the MELCOR-fusion code has been applied to two potential accident scenarios involving the degradation of the primary lithium loop of IFMIF-DONES. A rupture in the Quench Tank and a break in the inlet nozzle to the Target Vacuum Chamber were postulated as the two initiating events followed by a lithium spill into the Test Cell room. The purpose of this study was to obtain different key metrics, such as the maximum pressure and temperature loads reached in the TC room, the amount of the leaked lithium mass, and the time for lithium solidification. The computed results will help identify the safety requirements to be applied to the final design of the TC room.

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Lithium fire protection design approach in IFMIF-DONES facility

Cited by 7 publications

References 54 publications

Impact of yttrium hydride formation on multi-isotopic hydrogen retention by a getter trap for the DONES lithium loop

Impact of yttrium hydride formation on multi-isotopic hydrogen retention by a getter trap for the DONES lithium loop

Design of a multi-isotopic hydrogen co- and counter-permeation experiment for HCPB related tritium mitigation studies

Application of the MELCOR for Fusion Code to the Transient Accident Analysis of the IFMIF-DONES Test Cell

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