Preliminary Engineering Study Intermediate Range Instrumentation PDF Download

Instrumentation studies and the Hazards Review have demonstrated the need for instrumentation which will scram the reactors if the exponential rate of power increase is excessive. A development program has demonstrated the feasibility of such a system. This document defines the program necessary to provide Intermediate Range exponential rate protection in the safety circuits of five reactors, provides justification for the project, and presents estimates of the cost and schedule required to accomplish the program. Three channels of IRATE (Intermediate Range Automatic Trip Equipment) should be installed in the two K and three small reactors., and incorporated into the Number 1 Safety Circuits. Each channel should sense the output of its own gamma-compensated ion chamber located in the thermal shield of the reactor. A two-out-of-three channel coincident trip circuit should be used in the safety circuit. GE should manage the program and develop the specifications for the engineered equipment. Procurement should be by competitive bids to GE's specifications and drawings. The proposed program is estimated to cost $520,000.