[en] This report documents the technical evaluation on the decalibration of the neutron detectors at the Fort St. Vrain Nuclear Generating Station. The evaluation is to determine that the added circuitry for generating a floating trip setpoint as a function of indicated power meets NRC design criteria and has no adverse effects on the plant protection system. The evaluation finds that the floating trip setpoint circuitry meets the design criteria specified in the plant's FSAR and will produce a reactor trip (as a function of indicated power) before the true power limit value in the Technical Specifications is exceeded