Here is a question for you?
How many hours do they expect you to work?
How much vacation time?
How much sick time?
And if they have been doing this for a while why do people keep working their if it so bad?
I don't really know all the numbers and right now I am too lazy to look it up, but here is the gist of it:
You are expected to to work when they decide they need you, Night and day.
An ordinary work week is 37,5 hrs a week (by law, yay Norway), but jurnos and tv/radio people are by and large exempt from that. That is, your employer can make you work more, YMMV.
The pay is good even for temps. Overtime is well paid, but the rules are convoluted and the forms are kinda complicated to fill in correctly.
Vacation and sick time is the same as everyone with a job in Norway has.
But the real issue is that IF you can get a job with NRK you are pretty much set, they pay really well, have excellent benefits, pension plans etc.. AND you get to work for the most respected broadcaster in Norway.
NRK knows this and uses the fact to use or even abuse the temp system for all it is worth, and very few complains in fear of not landing a regular job with the broadcaster.
 I think.. Someone correct me if wrong.
 I have only worked there as a contractor (in IT - implementing some SGI servers) years ago, and back then the paperwork was staggering, even for me..