Almost everyone agreed that for PWRs the dominant failure scenario for Category 1 LOCAs was steam generator tube failures.

Used non-piping database which was augmented back to 1987 to capture 2 major events in ‘87 and ’89. There have been 15 leaks since 1990 with 4 events over 100 gpm (380 lpm) since 1987.

On VG2 the reference to Nine Mile Point should be to Indian Point.

Fred Simonen stated that usual scenario assumed for higher category LOCAs is common cause failures such as losing pressure on secondary side causing pressure differential across tube and failure of multiple already degraded tubes.

Rob’s analysis of independence (ignoring common cause) was viewed with a great deal of skepticism;

Bill Galyean commented that if look at LERs always see multiple tube degradation but only see single tube rupture in the LERs.

This analysis is for 25 years, panel members left to their own devices for later years.