Abstract
The moderator temperature coefficient (MTC) of a light water reactor is a very important parameter from the reactor safety point of view, because it plays a role in providing negative feedback during power excursions. From this point of view, the MTC, in Japan, is designed to be negative for all operating conditions. In pressurized water reactors (PWRs), the MTC is known to be close to a positive value at beginning of cycle and hot zero power, and it is measured and confirmed to be negative under these conditions at the startup test after each refueling. It takes a few hours to obtain this data, and if possible it would be better to reduce this time in order to shorten the refueling outage time. In this paper we propose a new procedure for measuring the MTC in about a quarter of an hour using Fourier transform of both the reactivity and temperature signals.
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