IS 15398 : 2003 Software for Computers in the Safety Systems of Nuclear and Radiation Facilities

1 Scope

1.1 This standard is applicable to highly reliable softwarerequired for computers to be used in the safety systems of nuclearfacilities for safety functions - Class 1 functions according to IS12772 : 2003 `Application of computers to nuclear reactorinstrumentation and control'. This includes the safety actuationsystems, the safety system support features and the protectionsystems.

1.2 This standard covers requirements for each stage of softwaregeneration, including design, development, qualification andoperation as well as the documentation for each stage of thesoftware generation for the purpose of achieving highly reliablesoftware. An acceptable approach to the development and content ofthe software requirements is given in Annex A.

The principles applied in developing these requirements include:

a) Best available practice;

b) Top-down design methods;

c) Modularity;

d) Verification of each phase;

e) Clear documentation;

f) Auditable documents; and

g) Validation testing.

1.3 Additional guidance and information on how to comply withthe requirements of the main part of this standard is given inAnnex B to Annex F.

1.4 If practices differing from those of the Annexes are used,they shall be documented and auditable according to therequirements of the main part of this standard.

2 References

IS 12772 : 2003 Application of computers to nuclear reactorinstrumentation and control

IS 15399 : 2003 Hardware for computers in the safety system of nuclearand radiation facilities