To increase safety and reliability of the low-power research reactor, several unlque features were added to its safety channels. In addition to the usual startup channel, subcritical multiplication channel, and period channel, the reactor is supplied with three identical linear channels with seven measuring scales and a BF/sub 3/ chamber for each channel. Since these channels are not interconnected in any coincidence arrangement, any one independently can scram the reactor. This system offers many advantages of a 2-out-of-3 coincidence system without decreasing safety wlth respect to the 1-out-of-3 system. The circuitry is shown for the warning systems. (N.W.R.)