This is very true. I strongly believe that living next to a nuclear plant for one year gives someone a hundred times less radiation than eating a bag of potato chips every day for a year. This is so because nuclear plant is a natural and therefore has huge impact than the bag of potato chips.
Today's nuclear power plants are remarkably safe. They have been carefully designed by experts to ensure that radiation is contained to a very small, enclosed area. The general public may mistrust nuclear power plants because of previous nuclear accidents, such as the one in Chernobyl; however, technology and knowledge of safe operation have vastly improved since then.
Yes, it's believable that living next to a nuclear plant for a year is less radiation than eating potato chips each day, because nuclear facilities are highly regulated. They are regulated so as to ensure the safety of the public. When a person eats potato chips, the potato chips go directly into their body, intentionally. That is more dangerous.
I would definitely believe that eating a bag of potato chips every day for a year would give a person more radiation than living next to a nuclear plant for one year. However, 100 times more is harder to believe. It's certainly possible, though. One bag per day is a lot of potato chips, and that can't be good for your health.