(a) pumps and valves that are required to perform a specific function in shutting down a reactor to the safe shutdown condition, in maintaining the safe shutdown condition, or in mitigating the consequences of an accident;
(b) pressure relief devices that protect systems or portions of systems that perform one or more of these three functions; and
(c) dynamic restraints (snubbers) used in systems that perform one or more of these three functions.
ASME OM-2020 history
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