BS IEC 62003:2020 pdf free download – Nuclear power plants – Instrumention, control and electrical power systems – Requirements for electromagnetic compatibility testing
6 Electromagnetic environment
The typical locations covered by this document are found within nuclear power plants and similar nuclear facilities. The locations generally follow a typical power plant installation shown in Figure 2 based on IEC 61 000-6-5. In Figure 2, the solid lines do not represent physical boundaries between the areas where the equipment is installed, but indicate generic boundaries between electromagnetic environments. A majority of the I&C and electrical equipment covered under this document will be located in environments defined as interface type 2 meaning that it will not directly interface with the electrical process (medium and high voltage power distribution). For I&C and electrical equipment that does directly interface with the electrical process, the typical environment would be defined as interface type 3 in Figure 2. Therefore, the test levels specified in this document will be based upon the assumption that the equipment to be tested will be installed in these interface type 2 or interface type 3 areas of the plant. It should be noted that the electromagnetic environment within these interface type 2 and 3 (and other) areas can vary significantly depending on the specific plant location and installation/design practices. If the equipment will be installed in a more or less severe environment (or if the country specific standards are different), then the test levels can deviate from those presented in this document as long as an appropriately documented justification is provided. Guidance is provided in Annex B to aid in determining specific test levels and providing the proper justification based upon the intended installation location. Further information on the interface types in typical power stations can be found in IEC 61 000-6-5. Additional information for classification of the electromagnetic environment can be found in IEC TR 61 000-2-5.
7.1 General
Nuclear I&C and electrical equipment important to the safety of a nuclear plant shall satisfy the requirements for immunity to electromagnetic interference documented in Table 1 of this document. If an item is deemed to be inappropriate for the EUT, exemption shall be justified by consideration of operating conditions or other relevant factors and documented in the EMC test plan. The degrees of test severity and acceptance criteria that are established for nuclear I&C and electrical equipment emissions and immunity testing shall be documented in the EMC test plan and test report.
Immunity levels for nuclear I&C and electrical equipment have been established in accordance with Table 2 through Table 5 for a typical installation in a nuclear facility. For each item of nuclear I&C and electrical equipment, if one or more of the immunity levels from Table 2 through Table 5 are determined to be inadequate (too restrictive or non-conservative) for the different disturbance types in Table 1 then the individual test level(s) can be established and properly documented in the EMC test plan based on the severity of the electromagnetic environment (using guidance from Annex B) where the system will be installed or the category of function performed by the system to be installed (based upon IEC 61 226). Electromagnetic environments are classified in accordance with the qualitative parameters in informative Annex B and Annex C. Country-specific clauses may require the application of higher or lower immunity levels.