Redundancy and Diversity
Here are two basic concepts that should be understood by every electrical engineer in the nuclear power industry: redundancy and diversity. They are closely…
Design Basis
Archive
Author: John Livingston
A quick note about cable flame test requirements
Here’s one that can trip you up if you aren’t aware of an NRC-published update. It’s about testing cables to the correct flame-spread standard.…
Environmental Qualification
The environmental qualification testing standards endorsed by the NRC
What does it take for a piece of electrical equipment to meet environmental qualification requirements? The test battery is rigorous. Here are the testing…
Environmental Qualification
Environmental Qualification
Environmental qualification has to do with Class 1E equipment installed in a harsh environment. But it may not be as intuitive as it at…
Environmental Qualification
The term “Class 1E” explained
This is a critical term that electrical engineers must know. It’s closely linked to the term “safety-related”. But there’s a critical distinction that many engineers…
Licensing Basis
The definition of “safety-related” explained
Two terms you must become familiar with overnight are “Safety-Related” and “Class 1E.” In this post I focus on safety-related . . . .
Licensing Basis
Modifying the UFSAR with the 50.59 process
Often a design will require updating something in the UFSAR. It might be a drawing or some text. There’s a process for that .…
Licensing Basis
The most important task performed by the tech specs
The Tech Specs don’t include the basis used to explain and justify them. Those explanations are contained in the Tech Specs Bases. That raises…
Licensing Basis