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J. Blázquez, I. Vallejo, A. García-Berrocal, M. Balbás
Nuclear Technology | Volume 176 | Number 2 | November 2011 | Pages 284-289
Technical Paper | Nuclear Plant Operations and Control | dx.doi.org/10.13182/NT11-A13302
Articles are hosted by Taylor and Francis Online.
In the case of large burnup, a control rod (CR) guide tube in the pressurized water reactor of a commercial nuclear power plant might bend. As a consequence, a CR drop experiment may indicate an event of a CR partially inserted and whether the CR should be deemed inoperable. Early prevention of such an event can be achieved by measuring two friction coefficients: the hydraulic coefficient and the sliding coefficient. The hydraulic coefficient hardly changes, so that the curvature of the guide tube can only be detected thanks to a variation of the sliding coefficient. A simple model for the CR drop is established and validated with CR drop experiments. If tmx denotes the instant of CR maximum velocity, a linear relationship between (tmx)-2 and the sliding coefficient is found.