Check Valves

[fighting_cax]

If the check valves in nuclear power plants do not function properly, other parts of the plants’ piping systems can be critically damaged. Check valves cannot be tested in actual operation, but they are disassembled as part of routine annual maintenance and any flawed parts are replaced. Therefore, power plant accidents attributable to malfunctioning check valves are unlikely to occur.
Which of the following, if true, most weakens the argument above?
(A) Approximately 80 percent of accidents in nuclear power plants are attributable to failures in piping systems.
(B) Check valves in nuclear power plants tend to wear out after a few years in operation.
(C) Disassembling check valves can expose workers to radiation if precautions are not taken.
(D) Flaws in any part of a check valve can be identified when the valve is disassembled.
(E) Errors made in the reassembly of check valves can go undetected.

Please explain.

[cajain]

Conclusion: Check Valve accidents wont happen because they are inspected annually by disassembling them and replacing faulty parts. What if the assembly was not done in a right manner.

[krisraam]

IMO E

[umaa]

If the check valves in nuclear power plants do not function properly, other parts of the plants’ piping systems can be critically damaged. Check valves cannot be tested in actual operation, but they are disassembled as part of routine annual maintenance and any flawed parts are replaced. Therefore, power plant accidents attributable to malfunctioning check valves are unlikely to occur.
Which of the following, if true, most weakens the argument above?
(A) Approximately 80 percent of accidents in nuclear power plants are attributable to failures in piping systems.
(B) Check valves in nuclear power plants tend to wear out after a few years in operation.
(C) Disassembling check valves can expose workers to radiation if precautions are not taken.
(D) Flaws in any part of a check valve can be identified when the valve is disassembled.
(E) Errors made in the reassembly of check valves can go undetected.

Please explain.

A - doesn't weaken
B - Strengthening the argument. Because annual maintenance is there
C - disassembling might cause radiation. This doesn't mean that its an accident or its because of malfunctioning
D - Strengthening the arg.
E - If the check valves reassembled with error, it might cause the accident (Check CAN in the argument)

After filtering the condensers, try to opposite them and see if they affect the argument.

For example. Errors made in the reassembly of check valves can be detected.

[gmatmachoman]

E weakens the argument.

[Bidisha800]

(E)

[tanviet]

I see B also weakens, it is not sure that maintenance block wearing

[mason77]

I am leaning more towards B, but I'm not sure about it.