Comitato Elettrotecnico Italiano

Nuclear power plants - Instrumentation and control important to safety - Hardware design requirements for computer-based systems
 N EN 60987

Annotation

General

This International Standard is applicable to NPP computer-system hardware for systems of Class 1 and 2 (as defined by IEC 61513).

The structure of this standard has not changed significantly from the original 1989 issue; however, some issues are now covered by standards which have been issued in the interim (for example, IEC 61513 for system architecture design) and references to new standards have been provided where applicable. The text of the standard has also been modified to reflect developments in computer system hardware design, the use of pre-developed (for example, COTS) hardware and changes in terminology.

Computer hardware facilities used for software loading and checking are not considered to form an intrinsic part of a system important to safety and, as such, are outside the scope of this standard.

NOTE 1 Class 3 computer-system hardware is not addressed by this standard, and it is recommended that such systems should be developed to commercial grade standards.

NOTE 2 In 2006 the development of a new standard to address hardware requirements for “very complex” hardware was discussed within IEC SC 45A. If such a standard is developed then that standard would be used for the development of “very complex” hardware in preference to IEC 60987.

Use of this standard for pre-developed (for example, COTS) hardware assessment

Although the primary aim of this standard is to address aspects of new hardware development, the processes defined within this standard may also be used to guide the assessment and use of pre-developed hardware, such as COTS hardware. Guidance has been provided in the text concerning the interpretation of the requirements of this standard when used for the assessment of such components. In particular, the quality assurance requirements of 4.3, concerning configuration control, apply.