Luther “Sunny” Miller is nearly 80, but in his younger days, he worked at Aerojet, a rocket and missile manufacturer located quite literally in his backyard. He can’t prove it, but he worries that his thyroid and bladder problems, and his wife’s kidney disease, can be traced to the plant. Last year, national nuclear supplier BWX Technologies purchased the factory in Jonesborough, Tennessee and announced plans for significant expansion. The new f…