HTGR performance under adverse network conditions

This paper analyzes the performance of the auxiliary systems of High Temperature Gas Reactor (HTGR) Reference Plant under conditions of degraded electrical network supply resulting from certain postulated power system disturbances. Specifically, an attempt is made to identify the particular conditions of non-standard frequence and/or voltage at which the generator´s capability to produce power starts to decrease and, if such condition exists, to identify the particular equipment (electrical or mechanical) whose performance is causing the limitation. A discussion of the effects arising from specified changes of voltage and/or frequency on plant operation is presented. A set of degraded electrical network supply conditions has been assumed to have originated from system switching, load changes or due to abrupt loss of major generation, transmission lines or major interconnecting ties.