Terms: f Terminology index
Note:
The terminology developed during the PLCS project has been included "as is".
A number of the terms are still in Draft

The terms defined in the terminology dictionary and in the Business DEXs.

facility
  Definition: The physical means or equipment for facilitating the performance of an action, eg, buildings.

NOTE    Synomym to support infrastructure.

 
  Synonyms: support infrastructure  
  Source:

[1] ISO 15288, Systems engineering -- System life cycle processes , 2002.

 
  Version: 2.1  
  Status: complete  
failure
  Definition: Failure is termination of the ability of an item to perform a required function ().

NOTE    Note 1: Failure is

  • an event
  • a state

Note 2: After a failure a fault will exist for some period of time.

Note 3: Faults may exist without a failure having occurred (e.g. faults as built, maintenance errors, damage).

Note 4: A failure, or the existence of a fault, in one component may cause a failure, and hence a fault, in another.

Note 5: A failure may have probability of occurrence during a given mission..

Note 6: A fault may have a probability of existing during a mission.

  
  Source: PLCS OASIS  
  Version: 1.1  
  Status: complete  
failure mode
  Definition: A failure mode is an event (eg failure, damage), or sequence of events, through which a particular fault, or set of faults, may arise. .

NOTE    Note 1: A failure mode may be compensated by operator action or design provision.

Note 2: A failure mode may have a probability of occurring, during a mission.

Note 3: A failure mode may only be relevant to certain plant states/mission phases.

Note 4: The same fault may result from different failure modes.

Note 5: In some other standards the term "failure mode" is used as a synonymy for fault.

  
  Source:

[1] PLCS terminology dictionary, 2000.

 
  Version: 1.1  
  Status: complete  
failure reporting and corrective actions system
  Definition: Definition??

NOTE    Abbreviation: FRACAS

 
  Synonyms: FRACAS  
  Source: PLCS OASIS  
  Version: 1.1  
  Status: in_work  
fault
  Definition: A fault is an anomaly that causes loss of a required function.

NOTE    The requirement for the function, and hence the failure condition, may vary with circumstances. The same anomaly, on the same product, could be classified as a fault under one circumstance (eg full power state) and as a degradation in another (half power state).

 
  Synonyms: anomaly (n)  
  Source:

[1] PLCS terminology dictionary, 2000.

 
  Version: 1.1  
  Status: complete  
feedback
  Definition: Feedback of information of relevance to product support.

NOTE    Includes:

  • work requests or issues which may lead to change
  • requests for identifiers for product or support elements
  • impact reports in response to change tasks
  • status reports on progress with change tasks
  • support and commissioning feedback (see own definitions).

In combination with other inputs to the configuration management activities feedback may prompt the need for a change and assist the development of a change.

 
  Source:

[1] PLCS Activity Model, 2000.

 
  Version: 2.1  
  Status: complete  
feedback on support needs
  Definition: Requests for further information to support conflict resolution between requirements.  
  Source:

[1] PLCS Activity Model, 2000.

 
  Version: 1.1  
  Status: complete  
first use date
  Definition: The date when a support element is required for first operational use.

NOTE    The first use date is used to establish the schedule of commissioning activities.

 
  Source:

[1] PLCS Activity Model, 2000.

 
  Version: 2.1  
  Status: complete  
FMECA
  Definition: Failure Mode, Effects, and Criticality Analysis  
  Source: PLCS OASIS  
  Version: —  
  Status: —  
FRACAS
  Definition: Failure Reporting And Corrective Actions System  
  Synonyms: failure reporting and corrective actions system  
  Source:

[1] PLCS terminology dictionary, 2000.

 
  Version: 2.1  
  Status: complete  
function
  Definition: A task, action, or activity performed to achieve a desired outcome.  
  Synonyms: task (n), activity  
  Source:

[1] EIA/ANSI EIA-836, Processes for Engineering a System , 1998.

 
  Version: 1.1  
  Status: in_business_review  
functional attributes
  Definition: Measurable performance parameters.

NOTE    Functional attributes are expressed in terms of quantitative performance parameters such as:

  • range
  • speed
  • lethality
  • reliability
  • maintainability
  • safety
  • operating
  • logistics parameters

along with their respective tolerances.

  
  Source:

[1] EIA/ANSI EIA-649-A, National consensus standard for configuration management , 2004.

 
  Version: 1.1  
  Status: in_business_review  
functional capability
  Definition: The ability to fulfill the design intent.  
  Source:

[1] PLCS terminology dictionary, 2000.

 
  Version: 2.1  
  Status: complete  
functional failure
  Definition: The inability to perform an intended function (eg cannot provide motive power).  
  Source:

[1] PLCS terminology dictionary, 2000.

 
  Version: 1.1  
  Status: in_work  

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