APDA reactor components test

1000 Mwe LIQUID METAL FAST BREEDER REACTOR FOLLOW-ON STUDY: REPORT OF TASKS II AND III. A REFERENCE CONCEPTUAL DESIGN OF A 1000 Mwe LMFBR. VOLUME III. SAFETY AND CONTROL ANALYSES.

“…Various combinations of the above.The thermal barrier scheme(5) was adopted for the shim-regulating assemblies because it is the simplest and therefore most reliable. Scheme (1) is also simple in principle but it would increase the required number of rod drives by a factor of at least 3 and would complicate the fuel subassembly design.…”