[en] The design effort reported and performed by ARD in the period February--July 1978, and by S and W from mid-March to July, 1978 concentrates on those parts of the nuclear island unique to a commercial size pool type LMFBR. In particular, the work covers the reactor vessel, deck, rotating plugs, upper and lower internals, internal plenum separator system, IHX, pumps, cold traps, intermediate system layout, containment/confinement system, plot plan, and residual heat removal systems. Preliminary thermal, hydraulic, stress and system analyses are also presented