Clearly the events in Japan have been a huge news story in the UK and around the world with the earthquake leading to a tsunami and then a major nuclear problem. For an insight into the technical issues relating to the nuclear plants, I turned to the excellent Material World on BBC Radio 4 which devoted a whole programme to discussing the issues arising.
An interesting point raised early in the discussion of the piece is that nuclear power plants have a design life of 30 years or so and consequently the current disaster has impacted on plant designed many, many years ago. The anaology of how we drove cars then without seat belts, air bags, crumple zones and without ABS braking is quite telling when one translates this to the nuclear power plants affected by the tsunami - clearly the damage and issues arising from these does not necessarily tell us very much about the potential safety of plants being designed and built today. Another plant of a different design at Onagawa has survived without problems, and people locally took refuge there as the safest place to be.
Boiling Water Reactors have not been built in the UK and the Gas Cooled principles that were followed do not have the same weaknesses, and nor do the Pressurized Water Reactor (PWR) at Sizewell - which is good as this the closest to me now that Bradwell is being closed.
Nuclear power remains controversial - not least because the impact of a major incident can be so widespread, long term and deadly. Two things contribute particularly to the unease - you cannot see the radiation and therefore avoid it, and the health impacts are difficult to understand and long term creating great anxiety. Furthermore, the nuclear industry has a track record of secrecy, lying and cover up almost without comparison and therefore people mistrust what they are told.
In this case we have seen some of the best and worst of these responses. The industry have been consistently over-optimistic that their efforts would contain and resolve the problems encountered - leading to the Government issuing communications along these lines only to find events contradicting them. Unusually for Japan, the Prime Minister has now publicly criticised the power company for this and vented his frustration at being misled. On the positive side, Japan understands the lessons of Chernobyl and has promptly issued Iodine tablets which prevents the uptake of radio-active isotopes into the body, as well as stopping the consumption of food from the affected areas.
A further complication with radiation is that measures of radiation means precious little to most people, and understanding the difference between micro-Sieverts, milli-Sieverts and Sieverts is not something that many people have a grasp of. A really useful graphic has been produced which can currently be found at http://xkcd.com/radiation/ shed considerable light on this: the dose from Fukushima is not trivial but is considerably lower than safe limits and does not compare to Chernobyl in any way.
You can listen to the Material World podcast via this link http://www.bbc.co.uk/podcasts/series/material