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