Abstract
During the checkout of the Control Rod Assembly (CRA) control system, a fault occurred which could potentially drive all four CRA's at speeds >2''/min. Subsequent experimental tests were performed to purposely identify attainable rod speeds as a function of supplied voltage. Results indicated a rod speed of up to 29.7''/min was attainable at 100 volts. The LOFT Technical Specifications (Section 3.10.3.1) limit the voltage at the stators of the CRDMs to a maximum of 90 volts which will preclude rod speeds >28''/min with a 95% reliability at a 95% confidence level. In addition, redundant overvoltage monitors (OVMs) were installed in the CRA control system to preclude an overvoltage situation. The purpose of this LTR is to illustrate the probability of achieving an excessive rod speed event (>28''/min) both with and without the OVMs.
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