Hydrogen is normally produced in a nuclear reactor by radiolysis of the cooling water. Reactors have recombiners, igniters, and other means to dispose of this hydrogen before it becomes an explosion hazard. But when the core gets too hot, the zirconium cladding around the fuel will react with the water to produce much more hydrogen. (This reaction is rapid and exothermic, so in laymen's terms this is sometimes described as "burning" the core.) In unit 1, the amount of hydrogen overwhelmed the capacity of the recombiners, accumulated in secondary containment, and exploded.
I have not had time to research the causes of the explosions in units 2 and 3.
Today, the pace of innovation in the manufacturing industry is faster than ever before, but at the same time engineers are under increased pressure to get concepts to market quickly. Development teams must make fast and accurate decisions during the conceptual stage of design.
In the components business price can often be the determining factor as to what product the manufacturer uses. For a great many mass-market products and applications, the low-cost off-the-shelf, one-piece stamped receptacle fits the bill. The price is right, the performance is adequate. Download Now
In today’s cost-sensitive world, designers are often driven to specify the lowest cost solution for every aspect of their designs to ensure that their solution is competitively priced and their company remains profitable. However, specifying a low-cost, low-quality connector solution can result in premature failure, considerable re-work costs and damage to reputations.
Increasingly, product and services companies are seeking more information and control in the
operational lifecycle of their products, including service and use. Better information about the operational lifecycle, and the ability to use that information, requires more than just unstructured data flowing back from products in the field.