This is what I have to report thus far:
If it's a union job, they cannot give you a relocation package. They are limited by union rules and they can only offer a cash stipend to help on the moving expenses. I tested and interview last week and this week I was offered the position of auxiliary operator at a union plant with a $5K stipend. The recruiter said he will attempt to authorize more but I'm not really counting on much. I'm sure they will just move on to the next candidate. I think its my best interest to go with a non union plant and get more of a relocation package. I have two invitations lined up towards the end of March/ early April so I will be patient.
The hiring process in the nuke field is definitely a learning curve and I'm just rolling with the punches. This is one topic I haven't found a thread directly covering it.
Take this with a grain of salt - right now there are way more applicants than jobs - even in the nuke field. Turning down a job because of a lack of relocation package may not be a great idea in today's economy. My company, 2nd largest nuclear operator in the country, isn't hiring outside people right now unless there is a critical need. I think this is pretty typical in the industry.
Union vs Non-Union will probably have no effect on a relo package. They may have told you the union is the reason they can't offer you a huge package, but chances are they wouldn't offer much more to new management employees either. For example, I just changed jobs in the nuke field (commercial to commercial) as an Engineer III, and was offered a similar stipend for relo, and I have nothing to do with the union.
My advice to you is not to choose your place of employment - especially in this economy - based solely on relocation money. Look at the job location, work atmosphere, total salary + benefits package, etc. Relocation is a 1-time deal, that you honestly can't expect anywhere right now.
Just give it a thought...
Good luck!
-Brian