I spent 8 years in the USN as reactor plant electrician. I felt nuclear power was a safe alternative then, and I still do.
Three Mile Island and Fukushima both show that even when events occur that were far beyond anything the plants wee designed to sustain, the engineering of the containment structures protected the public and prevented a major release of fission products to the environment.
This is not an argument to dismiss the dangers of a meltdown. In both incidents reactors had been in operation prior to the loss of cooling, and in both cases core damage occurred. Had the containment not worked, people's lives would have been in danger.
But the fact is that the containment did work, the engineering was sound, and no member of the public even received a measurable dose.
Commercial nuclear reactors have been in operation in western countries since the middle 1950's. No member of the public has ever been injured by one of these plants.
That record cannot be matched by any other commercial source of power we have today.
The most telling argument for nuclear power is to look at the alternatives.
Coal - the environmental damage from using coal as a primary source of power is pretty obvious to all. From strip mines to acid rain to ash piles and air pollution, king coal has killed more people and ruined more land than any power source you can name. Yet it is the most plentiful source of power on the planet, next to uranium. Do we really want to go back to king coal? Really?
Oil & Gas - There is more oil and gas on this planet than the doom and gloomers keep telling us, it's just located where it is harder and harder to get. And also further and further from where most of it is used. The Exxon Valdez and the Gulf Oil spill are poster children for the hazards of getting this energy source from where it is hidden to where we need it. But it could be worse
The real horror story will be the day an LNG tanker goes up in a populated area. Depending on the conditions, the resulting damage could rival a thermonuclear strike, and make Brownsville, TX look like a wet firecracker.
Hydro power - Here is the US, we are taking DOWN dams not building them, as we realize the damage done to the fish stocks and environment exceed the benefits gained from using rivers as a power source. In the rest of the world, all the easily controlled rivers have already been taken. What's left is either hideously expensive (the Three Gorges) or where no one need the power.
What's left? - not a heck of a lot.
Please do not go on about wind power, or solar power, or tidal power. None of those technologies have scaled anywhere near as well as their promoters have claimed and none of them have been able to deliver reliable power 24/7.
Can they help?
Yes.
Can they be a primary power source? - no
The idea that we will live our lives based on how the wind blows or the sun shines is ludicrous.
Some day, we will figure out how to contain the thermonuclear genie, and fusion will provide us with unlimited power that does not pollute. But we have been chasing that dream for over 50 years, and we still have not got anywhere close to a commercially viable answer.
We will have to make a choice, let our civilization regress and fall for lack of power, or use the resources we have as well and as wisely as possible. Nuclear power is one of those resources.
We need it
Let's use it.