Inherent or full passive safety depends only on physical phenomena such as convection, gravity or resistance to high temperatures, not on functioning of engineered components, but these terms are not properly used to characterise whole reactors.Īnother departure is that most will be designed for load-following. They function without operator control and despite any loss of auxiliary power. Some engineered systems operate passively, eg pressure relief valves. * Traditional reactor safety systems are 'active' in the sense that they involve electrical or mechanical operation on command. The greatest departure from most designs now in operation is that many incorporate passive or inherent safety features* which require no active controls or operational intervention to avoid accidents in the event of malfunction, and may rely on gravity, natural convection or resistance to high temperatures. Calculated large release frequency (for radioactivity) is generally about ten times less than CDF. The IAEA safety target for future plants is 1x10 -5. * The US NRC requirement for calculated core damage frequency (CDF) is 1x10 -4, most current US plants have about 5x10 -5 and Generation III plants are about ten times better than this.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |