The evaluation of pump performance in complex hydraulic networks is often difficult due to the complexity of the system operation. While inservice testing is often performed when the particular system is in a test mode, the test conditions may be different from the actual operating conditions under which the system would be required to operate. In addition, the pump may have to function under various postulated accident scenarios, which can not be duplicated during plant normal operation. This paper will present a method of upgrading pumps by using a dynamic model, which allows the evaluation of the many factors affecting the system performance, in order to assure system operability.

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