A RETRAN model for a hypothetical steam line break occurring at low power operation of the Trojan Nuclear Plant Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/r207ts22s

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  • The goal of this study is the modeling of a postulated break of the steam line at the containment penetration of the Trojan Nuclear Plant which is owned and operated by Portland General Electric. To perform this modeling, the RETRAN computer code package was utilized. RETRAN is designed to provide a best-estimate thermal hydraulic analysis of complex fluid flow systems such as those associated with light water reactors, solving both steady state and time dependent problems. A one loop RETRAN model of the Trojan Nuclear Plant including both a primary system and one steam generator had been developed previously at Oregon State University and was used as a starting point. The first step of this study was the refinement of the model into a two loop model. Since Trojan has four actual loops, one modeling loop represents three actual loops and the other modeling loop represents one actual loop. This allows the simulation of a transient introduced in one loop only, in contrast to the one loop model which requires introduction of the transient in all four loops simultaneously The second step in this study was to establish a steady state solution at four percent power consistent with the 100 percent power solution. Since the steam generator outlet pressure increases as power decreases, steam line break flow rates will be higher at low power, yielding a more conservative result (higher mass and energy release rates). Although hot standby (zero power) implies the highest outlet pressure, four percent power was used for modeling convenience: fewer alterations to the existing model were required with no loss of accuracy. The final step of the study consisted of including the steam lines in the RETRAN model and the simulation of a steam line break at a weld at the penetration of the primary containment. This weld was of particular interest because its location makes inspection and maintenance difficult. The transient was modeled for the relatively short time span of two seconds since maximum flow and energy release rates occurring during this interval were of primary interest.
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