Abstract
1. The research performed has shown that, in the course of lengthy thermoradiation aging, the electric strength of the casing and turn insulation of the electromagnetic pump windings undergoes significant changes. Further, if the electric strength decreases in the initial aging period, then stabilization and even a certain increase in the breakdown voltage, will subsequently occur. 2. Processing the results of electric strength measurements makes it possible to use the data for individual samples to obtain analytic expressions for the breakdown voltage distribution function for the electromagnetic pump windings, to find calculated values of the parameters, and to estimate the possible service life of the coil insulation. 3. The values obtained for the breakdown voltage of the casing and turn insulation allow us to conclude that for a temperature not exceeding 410°C and a neutron fluence of up to 8.7·1019 m−2, in the absence of vibrational, current, and other loads, the electric insulation materials used in the electromagnetic pump windings can maintain acceptable electric strength for approximately 24,000 h.
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