Technical Requirements Manual

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The NRC made some rule changes in the mid-1990’s that simplified a critical component of a nuclear power plant’s licensing basis. This reduced the paperwork burden on both the NRC and the sites. It also gave birth to a new kind of licensing basis document. Continue reading “Technical Requirements Manual”

GE HAA relays in sudden-pressure applications

Picture of GE HAA 16B relay

Fault-pressure relays protect transformers from internal electrical faults that other protective relays, like differential or overcurrent, can’t always detect. If the transformer’s protective relaying scheme is old, it might have a GE model HAA relay installed. This is likely in nuclear power plants of a late 1960s or early 1970s vintage. Continue reading “GE HAA relays in sudden-pressure applications”