Standard No.:	NB/T 20060-2012
English Name:	The Separation Criterion for Instrumentation and Control Systems Important to Safety in Nuclear Power Plants
Chinese Name:	核电厂安全重要仪表和控制系统隔离准则
Professional Classification:	NB    Professional Standard - Energy
Issued by:	National Energy Administration
Issued on:	2012-1-6
Implemented on:	2012-4-6
Status:	valid
Language:	English
File Format:	PDF
Word Count:	7000 words
Price(USD):	140.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the separation requirements to be met for nuclear power plant instrumentation and control (I&C) systems and their cables important to safety. This standard is applicable to nuclear power plant I&C systems, and their cables, that are important to safety. It is also applicable to temporary installations which are part of those I&C systems important to safety (for example, auxiliary equipment for commissioning tests and experiments). This standard applies to the I&C of new nuclear power plants as well as to I&C upgrading or back-fitting of existing plants. For existing nuclear power plants, only a subset of the requirements is applicable; this subset is to be identified at the beginning of any project. 2 Normative References The following documents are indispensable for the application of this document. For dated references, only the dated editions apply. For undated references, the latest editions (including any amendments) apply. GB/T 13630 Design for Control Rooms of Nuclear Power Plants (GB/T 13630-1992, IEC 60964:1989, eqv) GB/T 15474 Classification on Instrumentation and Control Function Important to Safety for Nuclear Power Plants (GB/T 15474-2010, IEC 61226:2005, MOD) IEC 60332 (all parts) Tests on E1ectric Cab1es Under Fire Conditions IEC 61000 (all parts) E1ectromagnetic Compatibi1ity — Part 6-5: Generic Standards — Immunity for Power Station and Substation Environments IEC 62096 Nuc1ear Power P1ants — Instrumentation and Contro1 — Guidance for the Decision on Modernization 3 Terms and Definitions For the purposes of this document, the following definitions apply. 3.1 Associated circuit Circuit of a lower safety category that is not physically separated or is not electrically isolated from the circuit(s) of the higher category by acceptable separation distances, safety class structures, barriers, or electrical isolation devices but meets suitable criteria for safety. 3.2 Barrier

Foreword I 1 Scope 2 Normative References 3 Terms and Definitions 4 General Principles for Separation Within I&C Systems Important to Safety 5 Design Basis 6 Requirements for Cabling Separation Appendix A (Informative) Structural Changes of This Standard Compared with IEC 60709:2004