Document: NUREG-0800
Document ID: 644c1fee-247e-4265-9466-5876937a7120
Document Type: srp
Title: INFORMATION SYSTEMS IMPORTANT TO SAFETY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550086.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.5
CFR Part: 
CFR Title: 

Content:
for Emergency Response Capability,” with respect to accident monitoring instrumentation, ERF, and SPDS. The information systems review should address the topics identified as applicable in SRP Table 7-1. SRP Appendix 7.1-A describes review methods for each topic. Certain guidance documents identified in Parts 3 and 4 of SRP Table 7-1 apply only to BISI or accident monitoring instrumentation, but not both. The guidance documents that are applicable to specific systems are identified below. Major design 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 Regulatory Guide 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 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. 497-2002, “IEEE Standard Criteria for Accident Monitoring Instrumentation for Nuclear Power Generating Stations,” as endorsed by Regulatory Guide 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. Regulatory Guide 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 requirements. However, they should be designed so there is reasonable assurance that they