Failure threshold correlation for fast reactor transient overpower accident analysis

One important aspect in analysis of the transient overpower accident for an LMFBR is the prediction of time and location of fuel pin failure. A great deal of effort has been and is being devoted to the mechanistic prediction of fuel pin failure threshold; however, it is anticipated that some time will yet pass before a generally accepted model is available. For the interim, it appears desirable to continue development and use of empirical correlation of failure thresholds. Such development has been pursued at Westinghouse Hanford for about two years now, and shows promise of near term usefulness. A brief description is given of the evolution of this effort at Westinghouse Hanford. The most recent correlation that has been developed is presented together with a discussion of the manner in which it is applied. Some of the more recent developments are mentioned