Radiation Level Buildup on Plant Piping During Second Core Operation of Shippingport Plant

A comparison was made of after-shutdown primary piping radiation levels between Shipping-port PWR first core and second core operation. Due to changes in materials of construction, a higher power core, and other design parameters, it was thought that the radiation buildup would be different during second core operation. It was found that the radiation level due to ⁵⁸Co was greater during second core than first core due to the use of NiCrFe Alloy 600 steam generator tubing. All the other factors were found to essentially cancel each other.