The robins are chirping, the daffodils are pushing out of the cold ground and the sun is shining for an additional minute or two every day. It’s finally spring in the U.S., which for many nuclear power plants heralds the start of refueling and maintenance outages.
Every 18 to 24 months, nuclear power plants shut down to allow for the replacement of about a third of the fuel in the reactor with fresh rods. The outages also make it possible for plant personnel and contractors to perform a number of projects, such as the refurbishment or replacement of pumps and valves, and inspections of components not accessible when the reactor is operating.
Hundreds of contractors assist with this work, making these outages periods of intense, round-the-clock activity for at least several weeks. No doubt nearby coffee shops do a booming business, not to mention area hotels and restaurants.
The NRC also beefs up its inspection footprint during these shutdowns, which are usually scheduled for spring and fall because those are the times when the demand for electricity is generally lower. Resident Inspectors assigned to the plant on a full-time basis and specialist inspectors observe select work activities to ensure adherence to safety regulations. They are also able to glean information about what employees and contractors are learning as they put eyes on key pieces of equipment.
There are procedures that help guide NRC inspectors during outages, including one that helps target and prioritize areas for review. A key, though, is remaining flexible while maintaining a holistic view of what almost overnight becomes a particularly bustling workplace.
Nuclear power plants are baseload electricity generators designed to run at 100 percent, but they need to occasionally take a strategic timeout to refuel and kick the tires, so to speak. With careful planning, a focus on safety and an attention to detail, the tasks can be effectively completed and the unit restored to service in time to help meet the additional cooling demands of the ensuing summer or the warming needs of the following winter.