Process problems related to auxiliary systems and their influence in largecomponents behavior

Most of the large pumps or compressors in a plant are usually supported by some auxiliary system, i. e. oil circuit, process water circuit or any othe r systems to remove heat produced in the bearings, seals and by motor energ y losses. In the present paper the effect of transients or failures in the auxiliary systems of the main coolant pumps and feed water pumps of a Nucle ar Power Plant is dicussed. Furthermore a simple non intrusive technique fo r temperature measurements in an oil process water pipes is described. Conc lusions obtained to evaluate and improve safety and rieliability of these e quipments could be generalized to most of large pumps or compressors used i n power generation or process industry.