Overview
ISO 8107:1993 - Nuclear power plants - Maintainability - Terminology defines the typical parameters and terms required for collecting and exchanging maintainability data for nuclear power plants. The standard focuses on corrective maintenance terminology (with the note that a similar classification can be prepared for preventive maintenance). It provides a structured decomposition of downtime and related intervals to support consistent data collection, analysis and communication across organizations.
Key topics
- Scope and purpose: Establish common terms and parameters to make maintainability data comparable and exchangeable between parties involved in nuclear plant operation, maintenance and design.
- Maintainability concept: Maintainability expressed as the probability that an item will be retained in or restored to a specified condition within a given time, assuming prescribed procedures and resources.
- Downtime decomposition: Clear definitions for the components of total downtime, including:
- Undetected failure time (detection delays and undetected fault time)
- Fault diagnosis time
- Administrative delay time, with subcategories such as organization time, preparation time, programmed delay and external logistic delay
- Actual maintenance time, including in situ preparation, isolating time, access time, decontamination, shielding, active repair time, fault location, dismantling, and workshop repair time
- Data exchange context: Notes that general guidelines for exchanging reliability data for nuclear power plants are provided in ISO 6527; Annex A of ISO 8107 is informational.
Applications
ISO 8107 is practical for:
- Creating standardized maintainability data fields and databases for nuclear power plants
- Structuring downtime records so that corrective maintenance events are comparable across units, vendors and contractors
- Supporting maintainability analysis during design, construction and operation phases to improve accessibility, maintenance strategy and logistic planning
- Defining contractual and reporting language between plant operators, maintenance contractors and regulators
- Informing training, spare-parts policy and organization planning by clarifying time components that contribute to total unavailability
Who should use it
- Nuclear plant operators and maintenance organizations
- Reliability, maintainability and safety engineers
- Maintenance planners and logistics coordinators
- External maintenance contractors and equipment vendors
- Regulatory bodies and standards developers
Related standards
- ISO 6527:1982 - Nuclear power plants - Reliability data exchange - General guidelines (referenced for broader reliability data exchange practices)
Using ISO 8107:1993 helps ensure consistent terminology for maintainability, downtime definitions, and maintainability data exchange in nuclear power plant environments, improving clarity in analysis, procurement and operations.