Dear Senator Sanders. I think the regulation would be more simple and applicable if it was reduced to something along the lines of "you soil it you clean it". Decontamination costs for Fukushima are estimated at 13 Billion USD (http://www.nti.org/gsn/article/fukushima-cleanup-to-cost-minimum-of-13b/
). Who's picking up the tab? You guessed it the Japanese government. "The Japanese government said it anticipates spending a minimum of $13 billion to rehabilitate all of the territory exposed to radioactive contaminant" (http://www.nti.org/gsn/article/fukushima-cleanup-to-cost-minimum-of-13b/
The problem in Fukushima occurred due to a wall being too low among other things. But lets stick to the wall. The criteria for the wall height was based on the periodicity of earthquakes with such an intensity. As I understand the prior one occurred some 900 years ago. Let us put it at 1000 years to keep the math simple. So 13 Billion divided by 1000 is 13 million a year. Thirteen million US Dollars a year buys a lot of bricks for a wall. If we multiply 13 x 40 (the years in operation since it started in 1971) that's 520 million US Dollars. That's a lot of bricks!
If companies like TEPCO that operated the Fukushima had to cleanup messes like these they would be a lot more conscious of their security. If companies like TEPCO had to insure this I don't think any private company would do it given their security standards. If they did the premium would be so high it would be cheaper to put in higher security.
If they don't want to implement government set security standards why should the government pick the tab when they have incidents like these? Surely the country can't be left with the land contaminated, but the company should pay for the cleanup and if it can't it should be intervened by the company and criminal charges filed against it.
This lack of regulation is the biggest risk in nuclear energy not the radiation. The bad name nuclear power has attained over the years is due to human negligence. It is ironic that they are destroying their own reputation in the sake of profit. Killing the goose that lays the golden eggs.