For this reason, EDF has to verify that the development of EMTP® is compliant with quality standards, and has also to establish that the results provided by the program are adequate. This last aspect requires in particular a thorough validation of the program, which can be conducted for instance by comparing its results with measurements, or the results provided by another program already validated. Hence, for instance regarding lightning studies, the results of EMTP® calculations have been compared with lab-measurements performed by EDF R.D.
» Here's an example of an usage of EMTP for Nuclear Power Plant Studies by EDF.
• Alain Xémard, EDF Research and Developpement
• Jean-Luc Chanelière , EDF Nuclear Division
Open Phase detection with EMTP®
On January 30, 2012, Byron Nuclear Generating Station experienced a reactor trip due to a failed insulator near the high voltage side of the reserve transformer. When the insulator failed, a section of busbar fell and shorted to ground on the transformer side, while the energized side remained open-circuited. Due to coupling between phases in the reserve transformer, the voltage on the low side did not drop below the threshold to detect that the source was inoperable. The NRC has designated the lack of ability to detect this condition as a design vulnerability, and it is one that is common across the majority of plants in the US. This presentation provides an overview of the extensive EMTP® modeling work that Sargent and Lundy has done to analyze the open phase condition.
• Dr. M. D. Urbina, Ph.D
• Dr. J. P. Oliver, Ph.D
• Dr. S. S. Shah, Ph.D
• Dr. J. B Wisniewski, Ph.D