Abstract: An apparatus and a method are arranged to process an image signal including: a Central Processing Unit (CPU) which outputs a digital image corresponding to an input image from an image collection apparatus to an image display apparatus; a controller, or micom, which monitors an operation state of the CPU, and outputs a control signal depending on occurrence of an error in the CPU; and an image switch which switches an image output mode to one of a digital image mode and an analog image mode according to the control signal which is output through the micom in an input terminal of the CPU.

Abstract: Methods and apparatus for decontaminating disposable protective products prepared from polyvinyl alcohol (PVA), used in a nuclear power plant, to less than minimum detectable activity (MDA) are disclosed. In the disclosed methods and apparatus, solid protective products made of PVA, generated from a nuclear power plant, are dissolved into a liquid, and then are decontaminated to less than MDA. The PVA solution decontaminated in this way is concentrated to an appropriate concentration or dried, and finally is subjected to self-disposal. This can fundamentally block the generation amount of combustible waste amounting to 50% or more of low and intermediate level waste of nuclear power plants, thereby considerably contributing to a reduction of the operating expenses of the nuclear power plants.