Abstract
The purpose of this paper is to discuss the thermal hydraulic behavior and related dynamic response of the Dresden Unit 3 HPCI (High Pressure Coolant Injection) Injection piping. A hydraulic transient occurred on the HPCI injection line piping, that resulted in damge to piping support, pulling the anchors out of the wall. The ensuing investigation following the discovery of the failed support suspected a possible waterhammer event, but walkdowns of the system did not provide much evidence of a propagating disturbance in the system. A review of plant data subsequent to the July 5, 2001 trip showed that during an automatic HPCI injection initiation, a pressure transient occurred, with the potential to produce loads on the piping and supports in excess of their designed capacity. The ensuing investigation determined that non-condensable was present at two locations within the system. It was also determined that the temperatures of the piping downstream of the HPCI injection valve were sufficiently high to introduce some amount of steam to the upper portions of the HPCI line during the time interval between the injection valve opening and the HPCI pump reaching pressure. This paper will discuss the analytical work performed to investigate this transient, along with the piping forces calculated for various scenarios considered.
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