[en] At the Karlsruhe Nuclear Research Center the microcomputer-based reactor protection system MIRA is being developed for the KNK II, a 20 MWe experimental LMFBR. The protection system's objective is individual core outlet temperature surveillance and output of a scram signal as soon as a single outlet temperature leaves the defined safety region. Besides it generates warning messages concerning any anomalies within the protection system itself as well as in the reactor core. These messages are issued to a protocol system which provides the operators with detailed informations on the actual state of the protection system and the reactor core. These informations are given as textual messages on operator console and printer and as diagrams on a colour graphics display. The protocol system helps in detecting cooling disturbances at an early stage and it eases the localization of faults within the protection system, thus providing for a quick repair. After a brief description of the MIRA configuration this paper presents the hardware and software structure of the protocol system and the generated outputs. (author)