Which barrier holds radionuclides that have escaped from the RCS?

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Multiple Choice

Which barrier holds radionuclides that have escaped from the RCS?

Explanation:
Radionuclides that escape the Reactor Coolant System are held by the containment. The containment is a robust, leak-tight enclosure around the reactor and its primary system designed to prevent any release of radioactive material to the environment, even under accident conditions. The other items play different roles: the fuel pellet and cladding form the fuel and its immediate barrier to fission products, while the RCS pressure boundary is the first barrier that contains the coolant itself. Shielding reduces radiation exposure in occupied areas but does not serve to retain leaked radionuclides. So containment is the barrier specifically designed to retain them if they bypass the initial RCS boundary.

Radionuclides that escape the Reactor Coolant System are held by the containment. The containment is a robust, leak-tight enclosure around the reactor and its primary system designed to prevent any release of radioactive material to the environment, even under accident conditions. The other items play different roles: the fuel pellet and cladding form the fuel and its immediate barrier to fission products, while the RCS pressure boundary is the first barrier that contains the coolant itself. Shielding reduces radiation exposure in occupied areas but does not serve to retain leaked radionuclides. So containment is the barrier specifically designed to retain them if they bypass the initial RCS boundary.

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