Eason database

There are three important databases that have been developed by (or for) the NRC PR-EDB, RVID and the so-called Eason database used for research and development of improved embrittlement correlations and trend curves. 

A significant amount of new data became available in 2003 when capsules from the BWR Supplemental Surveillance Program (SSP) were tested. Because low-flux BWR shift data were significantly under-predicted by the existing shift models, additional refinement of the NRC model was performed. Furthermore, the Eason database was updated for new PWR capsule test data (about 140 shifts) and then used to derive the embrittlement correlation known as EONY (after the developers Eason, Odette, Nanstad and Yamamoto) (Eason et al., 2007) which was codified in the Alternative PTS Rule, 10 CFR 50.61a (10 CFR, 2010). 

PWR surveillance data from countries other than the USA, France and Japan are collected from open literature. There are several sets of PWR surveillance data other than US commercial reactor data in Appendix A to NUREG/CR-6551 (Eason et al., 1998). Table 4.14 shows PWR surveillance data from other countries from the NUREG/CR-6551 database. 

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