IS 15399 : 2025/IEC 60987 : 2021 Nuclear Power Plants - Instrumentation and Control Important to Safety - Hardware Requirements
NATIONAL FOREWORD
This Indian Standard (First Revision) which is identical to IEC 60987 : 2021 'Nuclear power plants - Instrumentation and control important to safety - Hardware requirements' issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of Electronic Measuring Instruments, Systems And Accessories Sectional Committee, and approval of the Electronics and Information Technology Division Council.
This standard was first published in 2003 and was identical to IEC 60987 : 1989. This revision has been brought out to align it with the latest version of International Standard IEC 60987 : 2021.
This edition includes the following significant technical changes with respect to the previous edition:
a) Title modified;
b) Take account of the fact that hardware requirements apply to all I&C technologies, including conventional hardwired equipment, programmable digital equipment or by using a combination of both types of equipment;
c) Align the standard with the new revisions of IAEA documents SSR-2/1, which include as far as possible an adaptation of the definitions;
d) Replace, as far as possible, the requirements associated with standards published since the edition 2.1, especially IEC 61513, IEC 60880, IEC 62138, IEC 62566 and IEC 62566-2;
e) Review the existing requirements and update the terminology and definitions; f) Extend the scope of the standard to all hardware (computerized and non-computerized) and to all safety classes 1, 2 and 3;
g) Complete, update the IEC and IAEA references and vocabulary;
h) Check possible impact of other IAEA requirements and recommendations considering extension of the scope of SC 45A;
j) Highlight the use of IEC 62566 and IEC 62566-2 for HPD development;
k) Introduce specific activities for pre-existing items (selection, acceptability and/or mitigation);
m) Introduce clearer requirements for electronic module-level design, manufacturing and control;
n) Complete reliability assessment methods;
p) Introduce requirements when using automated tests or control activities;
q) Complete description of manufacturing control activities (control process, assessment of manufactured equipment, preservation of products); and
r) Define and ensure the inclusion of a graded approach for dealing with the 3 different classes of equipment and related requirements.
The text of IEC standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appears referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.