Diablo Canyon has a request for all BEACON users -
A recent review of our BEACON topical indicates a potential discrepancy between the BEACON topical and our Technical Specifications. The issue stems from the number of MIDS thimbles required to be used during a flux map. The BEACON topical in places states that the required number of thimbles is 75% with at least four thimbles per quadrant. Our Tech Specs only require two per quadrant. The draft COLR in the topical (provided to the NRC in an RAI on the topical) and the NRC SER on BEACON acknowledges the use of four per quadrant.
We requested approval to use BEACON PDMS through a license change that did not identify any deviations from the BEACON topical.
At this time, we have a conflicted licensing basis and are looking for input from other plants which may have a similar quandary.
* How many thimbles do you require? (% and #/quadrant?)
* Do you have a similar issue?
* Did you identify this as a difference between the topical and your application of BEACON?
* Do you have any other insights to share with respect to the use of BEACON?
Thanks in advance,
Mark Mayer
Diablo Canyon Power Plant
805-545-4674
