5.2.1 Electromagnetic (EM) threats are to be controlled using the appropriate methods for
the EM emitters and susceptible systems, equipment or components within the
submarine. This includes applying standards agreed by the Naval Administration and
conducting an EM threat assessment.
5.2.2 The EM threat assessment and EM vulnerability assessment is to identify all the
internal and external EM threats and vulnerabilities or hazards and identify all the
processes, procedures and mitigation requirements which are to be applied to achieve
the required electromagnetic compatibility (EMC) between the submarine equipment and
systems. The EM Threat assessment is to consider the risk to people, explosive
atmospheres and munitions associated with electromagnetic radiation.
5.2.4 The EM environmentshall be defined throughout the submarine for normal, abnormal and
emergency operating conditions. Limits are to be set taking into account the
electrical and mission system equipment likely to be on board the submarine,
personnel exposure and risk to flammable atmospheres and munitions.The definition of
the EM environment shall include:
- Conducted low frequency interference;
- Conducted radio interference;
- Radiated radio frequency fields;
- Fast low-energy transients (bursts);
- Slow high-energy transients (surges); and
- Electrostatic discharge (ESD).
5.2.5 The localised maximum transient EM environmentshall be defined for the areas where
there are high power emitters which exceed the general EM environment, e.g. bridge
fin.
5.2.6 The submarine, systems, equipment and components shall be protected from the effects
of lightning.
5.2.7 The submarine, systems, equipment and components that are required to operate and are
susceptible to a particular EM environmentare to be identified. They shall be able
to operate and be immune to the defined levels of interference for that location or
be fitted with suitable protection measures.
5.2.8 The EM environment defined shall take account of the impact on the embarked persons,
suitable control measures are to be put in place to manage exposure.
5.2.9 The EM environment defined shall take account of the impact on flammable atmospheres
which may be generated in or near the submarine, and suitable control measures are
to be put in place to reduce the risk of ignition. The effect of electrostatic
discharge on such operations is also to be considered.
5.2.10 The EM environment defined shall take account of the impact on munitions, suitable
control measures are to be put in place to reduce the risk of a munition
reaction.
5.2.11 An EMC Management Plan shall be provided which details the submarine’s operational
role and defines the EM environment in normal, abnormal and emergency operating
conditions, required submarine functions in the different EM environments, EM
systems requirements and organisational responsibilities.
5.2.12 An EMC Control Plan shall be provided which defines the design and mitigation
measures to be taken to achieve EMC in the agreed EM threat environment. These are
to include, but are not limited to the following:
- The EM threats;
- The zoning concept used;
- Exposure limits for personnel, munitions and hazardous
atmospheres;
- A declaration of the emission levels;
- A declaration the minimum immunity level;
- Shielding techniques and requirements;
- Cabling requirements;
- Filtering requirements; and
- Grounding requirements.
5.2.13 Levels of EM emission from the submarine equipment shall be known.
5.2.14 An EMC Test Plan shall be provided which defines the verification and validation
requirements, which are to include the analysis, inspection, demonstration and
testing requirements. The EMC test plan is to include verification of the EM
environment.
5.2.15 The EMC Management Plan, EMC Control plan, and EMC Test plan are to be maintained for
the life of the submarine and updated following modification or change. The effect
of modifications and changes are to be evaluated to confirm performance requirements
continue to be met.