When checks for accuracy could not be performed, the unvalidated status of the data should be clearly indicated.
Additional Information:
When checks for accuracy cannot be performed (e.g., a processor or redundant sensors are not available) the data is unvalidated. (Unvalidated data may be determined to be either valid or invalid as a result of the data validation process.) Under some conditions, unvalidated data may be useful to trained users in determining the safety status of the plant and determining whether human intervention is needed. Clear indications of the data's unvalidated status should be provided so the user can exercise judgment in interpreting it.