Section 1 Terms, definitions and Acronyms related to Part 4

1.1.1 The following terms and definitions are relevant:

• Abnormal operation. Conditions in which the Submarine can be foreseen to operate in a degraded, aged and/or damaged state, defined in the Concept of Operations Statement. Abnormal operating conditions will usually be associated with a conscious imposition of operating restrictions following foreseeable damage or loss of function. (e.g. a depth/ speed restriction, limiting the duration of a mission, reduced function for defined reversionary modes etc.).
• Accident. An identifiable event or series of events which can be foreseen but which is unexpected.
• Combustibility. The ability of a material to ignite and burn when exposed to heat.
• Dangerous goods. As defined in the UN Recommendations on the Transport of Dangerous Goods – Model Regulations.
• Emergency operation. Conditions in which a degree of function is required following an Accident or Extreme Threat Damage
• Essential safety function. Where the loss of function will be likely to place the submarine or individual crew members in danger of hazard in the near future unless mitigating factors are applied. Loss of essential safety functions may also cause a reduction in the ability of the submarine to respond to other incidents. For example, loss of a containment function may not be an immediate threat if containment is not needed, but it is essential since, due to its failure, containment would not be possible when required.
• Flammability. The ability of a material to burn with a flame under specified conditions.
• Flood. Ingress of external sea water from a pressure hull fracture, piping system or component failure. Generally, an emergency operating condition. Will be able to be controlled by the submarine up to a defined size of leak.
• Functional objective. A series of requirements which define the scope of the document or section. They typically identify subject areas or process steps.
• Goal. A high-levelstatement which describes in general terms, the primary requirement of the document or section.
• Leak. Escape of liquid or gas from a piping system or component. Generally a normal or abnormal operating condition which would usually be able to be controlled by the submarine.
• Normal operation. Conditions in which the submarine can be foreseen to operate in an intact condition with all systems available and operating within design parameters as defined in the Concept of Operations Statement. (e.g. depth/ speed, sea ice, persons embarked etc.).
• Performance requirement. A set of statementswhich define the requirements for the functional objective. They are to be independent of the technicalsolutions and are qualitative.
• Piping system. Includes pipes and fittings such as expansion joints, valves, pipe joints, support arrangements, flexible tube lengths etc. and components in direct connection with the piping such as pumps, heat exchangers, air receivers, independent tanks, etc. It does not include main and auxiliary machinery such as diesel engines, electric propulsion motors steam and gas turbines, boilers, reduction gears, etc.
• Safety function. As detailed in Vol 1, Pt 1 General and summarised here, in order to comply with the aims of the Assurance Framework, a submarine must provide certain safety functions. Other, non-safety functions, such as ‘military’, are not in scope, but may clearly follow the same system, using an additional categorisation process advised by stakeholders. The safety functions have an effective tier system although some safety functions have broadly equivalent tiers – as shown by the numbers.
• Software. All or part of the programs, procedures, rules and associated documentation of an information-processing system.
• Submerged. For the purpose of this framework, a condition whereby the entire submarine is below the surface of the water, and it is not possible to deploy any masts from this depth. In this Chapter, it is understood that the AIS system cannot be made to ventilate or exhaust at this depth.
• Transient. A short duration event where the deviation from the static condition will have an effect on the submarine, systems, equipment or embarked persons.
• Physical transverse criteria. These are actual properties, influences, forces or constraints that apply to all components in a submarine. Examples include shock, environmental conditions and signature. These properties are to be adequately defined for normal, abnormal and emergency operating conditions. Processes for their verification and acceptance are to be agreed with LR.
• Transverse process. These are processes, methodologies, calculations and practices which are applied to all parts of the design and concept of the submarine. These include risk assessment, systems engineering, hazard identification, software assurance and safety assessment. Analytical transverse elements are to be applied to all relevant aspects of the design of a component, product or system. The output from the process or assessment must be applied to the whole submarine design.
• Verification. For the purposes of this Chapter verification is a survey, test, inspection or other regime for gathering objective evidence that a product is in compliance with a validated Rule, standard or other specification.

1.2.1 The following Acronyms are relevant:

None specific to this part