Do we count the high fail rate of DSROs in the cost per license? If you calculate just the cost of a single failure, it would be undefined. Try dividing anything by zero and you will get similar results.
This actually brings us back to NukeLDO's original question. Time to recoup the training investment? If you spend X dollars on an instant SRO and he/she fails out after 18 months, then your training costs remains unchanged (the SROI and instructors still got paid). However, you'll never recoup the "investment". In other words, you went to Vegas and came home empty handed. That is certainly not an "undefined" number to an accountant.
So, when does a utility consider the SRO's ILT program to be paid off? Perhaps the first time he successfully navigates a problem and keeps the breaker shut. Maybe after three years? When does the SRO incur more liability for the company? Inadvertent plant trip perhaps? (How much does THAT cost a utility?!)
Some utilities provide a retention bonus for Licensed Operators. For example, stay on board for five years and after 60 months you get $50K (in addition to licensing bonus, performance bonus, etc). That implies, much like the NNPP bonus structure that it's easier to write a check for $50K and keep someone than it is to spend [insert the six figure number guess here] and start over.
In the end, Utilities are not losing any money...or they wouldn't do it.
Co60