If the power to the reactor control system in a PWR is suddenly interrupted, a PWR can still be shut


If the agency to the reactor restrain method in a PWR is suddenly intermittent, a PWR can peaceful be preclude down protectedly. Exactly how does a PWR issue a protected precludedown in this plight?

Name three spiritless materials that can be used for reactor restrain rods and two spiritless materials that can be used for burnable poisons