Answer: the correct answer is I, II and III
Explanation:Nuclear Power Decommissioning
Another consideration of nuclear power is the proper and safe closing (decommissioning) of power plants when they are not in use. In the United States, the Nuclear Regulatory Commission has rules for decommissioning nuclear power plants and considers three primary types:
In the DECON (decontamination) type of decommissioning, all parts of the plant that are radioactive are cleaned and taken apart. Then they are shipped to a low-level nuclear waste disposal site or stored on the original site. This type of decommissioning takes advantage of the skills of the current staff (as well as any knowledge of plant eccentricities).
In the SAFSTOR (safe storage) type of decommissioning, the plant is essentially locked up for 60 years while the radioactive components decay to stable elements. After 60 years, the plant is taken apart in a process similar to DECON. This reduces the amount of radioactivity during dismantling but, unlike regular DECON, passes the decontamination process on to another generation.
In the ENTOMB (entomb) type of decommissioning, the plant is encased in concrete or another substance until the radioactive components decay to stable elements. This process also passes on the decontamination process to another generation and relies on the stability of concrete to prevent leakages.
Which of the following describes an approach used to decommission a nuclear power plant? (2 points)
I. All parts of the plant that are radioactive are cleaned and taken apart.
II. Radioactive components are allowed to decay before clean-up.
III. Nuclear plant is encased in concrete.
I only
II only
I and II
I, II, and III