21. In some designs the core of a fast breeder reactor is immersed into a pool of liquid metal. 22. An accident in December stalled startup of Japan's prototype fast breeder reactor , which produces more fuel than it consumes. 23. The PFBR will be followed by six more Commercial Fast Breeder Reactors ( CFBRs ) of 600 MWe each. 24. India is in the process of launching its first prototype fast breeder reactor of 500 MW capacity in Tamil Nadu. 25. Research and development at ETEC primarily involved metallic sodium because the proposed Fast Breeder Reactor required liquid sodium to operate. 26. Japan eventually hopes to produce much of its energy through fast breeder reactors , which produce more plutonium than they burn. 27. In 1991 the American Nuclear Society established a prize in honor of his contributions to development of fast breeder reactors . 28. Liquid metal cooling is also used in most fast neutron reactors including fast breeder reactors such as the Integral Fast Reactor. 29. The new plant, with two BN-800 fast breeder reactors , is intended to utilize Mayak's liquid waste from ponds in the river. 30. But the UK didn't build a generation of commercial fast breeder reactors ( ref : " Bulletin of the Atomic Scientists"