Sentences with phrase «nuclear core cooling»

It provides stable long - term nuclear core cooling and plant recovery under all design basis accident conditions and also provides severe accident mitigation for low probability beyond design basis accidents.

Not exact matches

«FLEX would provide multiple means of obtaining power and water needed to fulfill the key safety functions of core cooling, containment integrity and spent - fuel pool cooling that would preclude damage to nuclear fuel,» explains Adrian Heymer, executive director of Fukushima regulatory response at NEI.

These reactors have the intriguing feature that the water used to cool the core and run the generating turbine is also essential to maintaining a nuclear chain reaction.

In case of an accident, multiple systems would keep cooling water flowing to the core, and control rods would quickly drop, automatically shutting down the nuclear reactions.

The Japan Atomic Industrial Forum, an industry body, estimates that core cooling systems are not functioning at all three Fukushima Daiichi operating reactors and two of the four reactors at the nearby Fukushima Daini nuclear power plant are relying on backup cooling systems.

The problem of spent fuel storage Nuclear reactor operators must store spent fuel removed from reactor cores for several years at least, in large pools at reactor sites until the remaining heat from the uranium fuel cools sufficiently.

In addition, if the melted nuclear fuel proves bad enough — like Chernobyl's lethal mass of molten core known as the «elephant's foot» — it will have to be entombed for a number of years rather than removed, because of radiation risk from what is essentially a cooled shell of ceramic armor surrounding a highly radioactive core that remains hot and is still undergoing radioactive decay.

In lower - mass stars like the Sun, however, there is insufficient mass to squeeze the core to the temperatures needed for this chain of fusion processes to proceed, and eventually the outermost layers extend so far from the source of nuclear burning that they cool to a few thousand kelvins.

Hence, in the context of nuclear power reactors, there is a need for post-shutdown core cooling to remove residual decay energy (think Three Mile Island and the consequence of a cooling system failure).

[iii] Although some countries like Germany are worried about nuclear safety because of the nuclear accident in Japan due to the tsunami, plant safety enhancements (e.g. passive cooling features that do not rely on generators to keep water flowing to reactor cores) make future accidents like Fukushima unlikely.