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5. Redesign: lock of manual valves to prevent hazard
If the operation of a manual valve is the initiating event; prevention may require
LO/LC or key interlocking solutions (cannot design an Inhibit SIF for a manually
operated valve)
In other cases, even when the Initiating Event is a remote operation, a change to
the locking procedures for manual valves could prevent the hazard. This solution
was applied to one of the Cargo Pump scenarios.
(Lock open of cross-over valve on suction side remove the overpressure
scenario)