The NRC requires nuclear plants to have both onsite and offsite power systems available to supply safety-related equipment. It also requires that this equipment be periodically inspected and tested so that their condition can be assessed. These requirements are established in General Design Criteria 17 and 18. Continue reading “Complying with GDC 17 and 18 – a survey of IEEE Std. 308”
There’s always room to better explain what an LCO actually is. One thing that’s helpful to know is the relationship between operability, surveillance requirements, and the LCO . . . .
The concept “limiting condition for operation” can be a bit tricky to understand at first. In the industry, we simply call them “LCOs”. This example will help you get it straight . . . .