ASME RAM-1-2020 pdf download

ASME RAM-1-2020 pdf download.Reliability, Availability, and Maintainability of Equipment and Systems in Power PlantsA.
boundaries: the interfaces that define where each system begins and ends. For a typical plant, the boundaries include physical, mechanical, and electrical isolation physical points, e.g., isolation valves or piping locations, heatexchangertubebundleinterfaces,electricalbreakers, or switch or termination points. This Standard requires system boundaries to be defined. condition assessments:judgements usedto assess thestate ofequipmentto determine the need to perform applicable maintenance; also called predictive activities. condition-based response: an initiative taken after a struc- ture, system, or component has failed to function in order to restore itto an acceptable condition. Also called correc- tive maintenance. condition monitoring: used to trend degrading conditions of a structure, system, or component that is not readily revealed byunavailability, reliability, and plant-level indi- cators for which advance awareness of degradation is needed. Some types ofcondition monitoring are vibration characteristics, temperature, acoustics, and electrical pa- rameters. corrective maintenance: see condition-based response criticality: the relative importance of tasks, equipment, systems, or components and their contributions to the mission. design basis: see basis ofdesign. failure finding tests: used to assess operational capability (operability) of standby or redundant equipment. failure mode analysis (FMA): an assessment addressing how a structure, system, or component can fail; what can cause the failure; what the likelihood of failure is; whattheconsequences offailure are; andways to mitigate thefailure.Themeansaremainlythroughdetection,main- tenance, or design redundancy.
maintenance: the aggregate ofthose functions required to preserve or restore safety, reliability, and availability of plant structures, systems, or components. Maintenance includes not only activities traditionally associated withidentifyingorcorrectingactualorpotentialdegraded conditions (e.g., repair, monitoring, testing, inspection examinations), but also all supporting functions required for the conduct ofthese activities. These include all activ- ities associated with the planning, scheduling, isolation, performance, restoration, post-maintenance testing, and return to service for surveillance and preventive and corrective maintenance. These activities are consid- ered maintenance regardless ofwho performs them (e.g., maintenance, operations, or engineering staff, or supple- mental personnel such as specialists and contractors). performance criteria: a specific quantitative value or threshold established to provide a basis for determining satisfactoryperformance. Performance criteriaare gener- ally based on the safety significance or economic success of a particular task, activity, or project. Performance criteria are used to monitor the effectiveness ofoperation andmaintenanceofaplantorstructure. Forthis Standard, the owner shall set performance criteria.reliability: the probabilityofanitemto performarequired function under stated conditions for a specified period of time, or the ability ofan item to perform a required func- tion under given conditions for a given time interval. requirements: specific, quantifiable characteristics that define the success of a project. These shall define plant function, plant life, plant output, and plant performance, e.g., plantefficiency, plantstaffing, plantavailability, plant reliability, plant maintainability, plant financials, and other characteristics that are important to the owner. This Standard requires the owner to provide specific plant requirements that will identify the success of the project. risk: the probability of a negative event occurring. risk assessment: the method ofassessing risk and quanti- fying the impact to public safety and/or plant perfor- mance. A risk assessment is done with the goal of reducing the risk such that the plant can safely achieve the performance required by the owner. (See also risk.) system: a group of structures, components, instruments, and controls that together perform a specific function(s) within a plant. A system shall be capable ofbeing defined by specific boundaries without overlap to establish clear ownership. System definitions improve the manageability of a RAM program. A system may be open or closed regarding the fluids that it contains (e.g., air, steam, water,oil,orgassuchasH 2 ).Examplesincludecondensate system, feedwater system, service air system, boiler system, turbine system(s), control system, high-voltage system. The system definition can be either broad or very detailed, as best serves the plant and RAM program. Systems will often be defined by piping and in- strumentation drawings (P&ID). Systems mustbe defined for this Standard. Systems are typically identified by the plant’s designer as a part of the design process.