The modified RF concept of CHC experimental module for testing on H–H iter phase

On Monitoring the Tritium Breeder in Demo and Iter

“…Зазор между стальной очехловкой стержня и массивом пористого бериллия толщиной  = 1 мм заполнен гелием при небольшом избыточном давлении по отношению к атмосферному. Температура окружающего пористого бериллия от задней стенки модуля до конца отверстия и зменяется от 500 до 520 ºС [5]. В активной части графитового стержня возникают внутренние энерговыделения, величина которых взята из результатов нейтронно-физического расчёта.…”

The design decisions of breeding zone sub-module for testing in ITER in order to validate the CHC TBM concept

“…Following this technical approach the concept of breeder arrangement inside the planar coil-pipe (this concept has been proposed for RF helium-cooled TBM and RF DEMO blanket, see [2][3][4]) has been transformed into the three-dimensional coil-pipe (serpentine-type). The main design parameters (pitch, diameters and wall thickness of internal and external pipes) of this serpentine are the same as for the planar one with the breeder arrangement inside the poloidal tubes (poloidal breeder-inside tubes (BIT)-concept).…”

“…The 3-D coil-pipe is the assembly of two coaxial abruptly bent pipes (external pipe is Ø56 mm × 2 mm and internal one is Ø38 mm × 2 mm; the serpentine pitch is 100 mm and identical both in toroidal and poloidal direction) that are arranged in radial direction. The assembling technology of this coaxial coil-pipe is identical to the technology which has been used for the RF helium-cooled TBM and presented in details in [4,5]. It is necessary to underline that this arrangement of serpentine elbows creates the significant non-uniformity of the specific heat in the breeder in radial direction.…”

“…This fact could cause the high temperature differences in the BZSM materials, nonuniformity of tritium generation in the breeder and decrease the coolant outlet temperature. In order to create the required profile of the specific heat in breeder the straight sections of internal coilpipe [4,5] are filled with cylindrical ceramic pellets (Ø30 mm with 10 mm height and Ø20 mm with 10 mm height depending upon the position inside the pipe), while the ceramic pebble-bed (spheres Ø0.5-1 mm) is arranged inside the U-shaped sections. It is possi- ble to obtain the required profile of specific heat in the breeder in radial direction (and as a consequence-the required temperature fields in the materials and tritium generation rate in the breeder) by the variation of 6 Li-isotope enrichment (increasing of enrichment as farther away from the first wall) in the pellets.…”