@article{upm15313,
           pages = {284--289},
            year = {2011},
           title = {Control rod drop surveillance using two friction coefficients},
         journal = {Nuclear Technology},
       publisher = {American Nuclear Society},
          number = {2},
          volume = {176},
           month = {November},
             url = {http://www.ans.org/store/j\%5f13302},
            issn = {0029-5450},
        abstract = {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.},
          author = {Bl{\'a}zquez, Juan and Vallejo, I. and Garc{\'i}a-Berrocal S{\'a}nchez, Agustin and Balb{\'a}s Ant{\'o}n, Miguel}
}