REACTOR OPERATION & MAINTENANCE GROUP
FAST BREEDER TEST REACTOR (FBTR)
| Description | Components | Safety | Radiological Safety | Construction, Commissioning & Operation Summary | Reactor Vessel Internal Inspection |
Description
The Fast Breeder Test Reactor is a 40 MW t, loop type, sodium cooled fast reactor. Figure shows the schematic flow sheet of the heat transport circuits. Heat generated in the reactor is removed by two primary sodium loops, and transferred to the corresponding secondary sodium loops. Each secondary sodium loop is provided with two once-through steam generator modules. Steam from the four modules is fed to a common steam–water circuit comprising a turbine-generator and a 100% dump condenser. The major characteristics of the reactor are given in Table 1. Stainless steel (SS 316) is the principal material of construction for the reactor and coolant circuits.
Table 1
Main characteristics of the Fast Breeder Test Reactor
|
Parameters |
Initial design |
Present small core |
Hybrid core |
| Reactor type | Sodium cooled, loop type | ||
| Reactor power | 40 MW t/13.2 MWe | 15 MW t/2 MWe | 31MW t/10 MWe |
| Fuel | MOX (30% PuO2 + 70% UO2 with 85% enrichment) | Mark I (70% PuC + 30% UC) | Mark I (70% PuC + 30% UC) |
| Mark II (55% PuC + 45% UC) | MOX (44% PuO2 + 56% UO2) | ||
| No. of fuel subassemblies | 65 | 25 Mark-I + 13 Mark-II | 27 Mark I + 57 MOX |
| Fuel pin diameter (mm) |
5.1 |
5.1(Mark I)/6.6(MOX) | |
| No. of pins/subassembly |
61 |
61(Mark I)/37(MOX) | |
| Maximum linear heat rating (W/cm) | 400 | 400 | 400(Mark I) / 250( MOX) |
| Maximum burn-up (GW d/t) | 100 | 155 | 150(Mark I) 100( MOX) |
| Peak neutron flux (n/cm2/s) | 3.5E15 | 2.2E15 | 2.27 E 15 |
| No. of control rods |
6 |
||
| Control rod material |
B4C (90% enriched in 10B) |
||
| Reactor inlet sodium temperature (°C) | 380 | 330 | 380 |
| Reactor outlet sodium temperature (°C) | 515 | 425 | 490 |
| Primary sodium flow (m3/h) | 1100 | 600 | 942 |
| Feed water temperature (°C) |
190 |
||
| Steam temperature (°C) | 480 | 405 | 480 |
| Feed water flow (t/h) | 70 | 25 | 46 |
| Steam pressure (kg/cm2) |
125 |
||
| Sodium inventory (t) |
150 |
||
| Steam generator |
Once-through type, seven tubes in shell, serpentine shaped |
||
| Turbine-generator |
16 Stages, condensing type, 16.4 MWe air cooled. |
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| Bypass circuit |
100% Dump condenser |
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