Document: NUREG-0800
Document ID: 0698b3f7-427d-4477-8d06-7b4cb5c20c5b
Document Type: srp
Title: INFORMATION SYSTEMS IMPORTANT TO SAFETY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1602/ML16020A088.pdf
Revision Date: 2024-06
Chapter: 7
Section ID: 7.5
CFR Part: 
CFR Title: 

Content:
esign considerations that should be emphasized in the review of the information systems important to safety are identified below. Recommended review emphasis for accident monitoring instrumentation A. Conformance with RG 1.97 and SRP BTP 7-10. B. Use of digital systems - Review of computer-based digital systems should consider the unique aspects of digital I&C - see SRP Appendix 7.0-A, “Review Process for Digital Instrumentation and Control Systems,” and SRP Appendix 7.1-D; design to protect against the potential for common-cause software failure; and the suitability of display characteristics. Additional guidance on the last two items may be found in Clause 6.2, “Common Cause Failure,” and Clause 8, “Display Criteria,” of IEEE Std 497, “IEEE Standard Criteria for Accident Monitoring Instrumentation for Nuclear Power Generating Stations,” as endorsed by RG 1.97, Revision 4. C. Emergency operating procedures (EOP) action points - A basis should be provided for EOP action points that accounts for measurement uncertainties. 7.5-10 Revision 6 - August 2016 RG 1.105, “Setpoints for Safety-Related Instrumentation,” provides acceptable guidance for establishing these uncertainties. D. Monitoring for severe accidents - The accident monitoring instrumentation should be demonstrated to perform their intended function for severe accident protection. They need not be subject to additional 10 CFR 50.49, “Environmental Qualification of Electric Equipment Important to Safety for Nuclear Power Plants,” environmental qualification requirements. However, they should be designed so there is reasonable assurance that they will operate in the severe accident environment for which they are intended and over the time span for which they are needed. E. Performance assessment - For systems developed in accordance with the guidance of RG 1.97, Revision 4, the review should confirm that the performance assessment fulfils the goals outlined in Clause 5.6, “Performance