Status of the ITER Cryodistribution

Chang, Hyuk; Vaghela, Hitensinh; Patel, Pavan; Rizzato, A.; Cursan, M.; Henry, D.; Forgeas, A.; Grillot, D.; Sarkar, B.; Muralidhara, Srinivasa; Das, Jotirmoy; Shukla, Vinit; Adler, Emerald P.

doi:10.1088/1757-899x/278/1/012018

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…Simulation of a total and of a partial LOFA in both cooling loops of a TF coil with AD = 30 min. Characteristic curves [22] at nominal speed and at 50% of nominal speed and computed trajectories of: (a) the WP loop cold circulator, and (b) the STR loop cold circulator. The nominal operating point is also reported (solid square), as well as the region behind the surge line (shaded area).…”

Section: A Total Lofa In the Wp And Str Circuitsmentioning

confidence: 99%

Analysis of a Protected Loss of Flow Accident (LOFA) in the ITER TF Coil Cooling Circuit

Savoldi

Bonifetto

Pedroni

et al. 2018

IEEE Trans. Appl. Supercond.

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In moving towards ITER operation, the detailed analysis of fault conditions for the magnets becomes of increasing importance, to verify that the magnet protection system can safely manage them without any damage to the magnets. A "protected" Loss of Flow Accident in the ITER Toroidal Field (TF) coils, detected by the coil flow meters and managed by the Central Interlock System, is investigated here using the validated thermalhydraulic code 4C. We simulate the entire sequence of events that is foreseen to protect the magnet, aiming at verifying the impact on the magnet. The LOFA consequences are investigated in terms of both the temperature margin in the winding pack and of the needed re-cooling time, which will affect the availability of the machine. It turns out that, for an "accelerated" discharge (i.e., a linear ramp-down) of the magnet current lasting less than 30 min, no quench should occur, while the corresponding recooling time should not exceed 1h. During the transient, ~ 10% of the He mass in the coil is vented to the quench tank due to the opening of the safety valves, and requires re-cooling.

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Section: A Total Lofa In the Wp And Str Circuitsmentioning

confidence: 99%

Analysis of a Protected Loss of Flow Accident (LOFA) in the ITER TF Coil Cooling Circuit

Savoldi

Bonifetto

Pedroni

et al. 2018

IEEE Trans. Appl. Supercond.

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Dynamic simulation of loss of insulation vacuum event for ITER cryodistribution system

et al. 2020

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Experiences during Design, Fabrication, Assembly and Factory Acceptance Test of the ITER Cryoplant Termination Cold Box

Patel

Vaghela

Muralidhara

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The ITER Cryodistribution (CD) system distributes cryogenic power from the cryoplant to the applications, namely superconducting magnets, cryopumps, etc. The ITER CD system comprises seven cold boxes of which the Cryoplant Termination Cold Box (CTCB) is the largest one. The CTCB plays a pivotal role in distributing the cold helium fluid with the highest mass flow rates of 4 kg/s coming from one of the 80 K plants to the applications. The physical connection between the CTCB and different applications is through nine cryolines (CLs) having diameters ranging from 0.45 m to 1.0 m. The CTCB has been manufactured and assembled with various large size components such as electrical heater system of 600 kW capacity, cryogenic control valves of size DN200, bubble panel thermal shield (TS) made of stainless steel, etc. The CTCB, which withstands interface loads of ∼1.4 times of its own weight, has been analysed for its functional and thermo-structural requirements under various load conditions. Components & subsystems were manufactured and factory tested individually in various locations in Europe and India to be finally assembled in one place. The CTCB has also been integrally tested, of which major activities were the pressure and helium leak tightness tests, followed by functionality checks of all instruments. The present paper describes the challenges involved and how they were resolved as well as lesson learnt during the design, fabrication, assembly, and factory acceptance test (FAT) phase of the CTCB project.

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Status of the ITER Cryodistribution

Cited by 3 publications

References 8 publications

Analysis of a Protected Loss of Flow Accident (LOFA) in the ITER TF Coil Cooling Circuit

Analysis of a Protected Loss of Flow Accident (LOFA) in the ITER TF Coil Cooling Circuit

Dynamic simulation of loss of insulation vacuum event for ITER cryodistribution system

Experiences during Design, Fabrication, Assembly and Factory Acceptance Test of the ITER Cryoplant Termination Cold Box

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