1. A protective system to prevent data word losses in a random access memory in the presence of a radiation pulse from a nuclear radiation event, or the like, which memory includes a multiplicity of individual memory elements and associated selective and read/write circuitry; the combination of: circumvent circuitry coupled to the selective and read/write circuitry for protecting all unaddressed memory elements in the memory in the event of a radiation pulse; accessing means coupled to the memory for selectively accessing the data words in the memory at the different memory locations therein; and error correction and word recovery logic circuit means coupled to the accessing means for reconstituting the data word being accessed during the radiation pulse so as to replace such data word in the memory with a reconstituted data word.
10. The combination defined in claim 1, in which the data words are stored in a memory module in a plurality of primary blocks, each primary block being constituted by a predetermined number of data words, and in which the data words are also redundantly stored in an independent memory module in a plurality of shadow blocks, each of the shadow blocks containing the identical words of a corresponding one of the primary blocks, and further logic circuitry for introducing data into a primary block and its corresponding shadow block simultaneously during a write up-dating cycle for any particular word in the primary block, causing the particular word in the primary block and in the shadow block to be replaced by an up-dated data word and for causing the accessing means to access only the primary blocks to derive a particular word therefrom during a read cycle.