Document: NUREG-0800
Document ID: 2dffe24e-cd37-4ffc-9c37-16faf25676b1
Document Type: srp
Title: Appendix 7-A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500579.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
nt with the design. Testing should show that the system meets limiting response times for a reasonable, randomly-selected subset of system loads, conditions, and design basis events. The subset should include some limiting load conditions, and should be chosen by persons independent of the persons who designed the system. Rev. 4 — June 1997 Appendix 7-A BTP HICB-21-6 Measurement methods should be appropriate to the resolution and detail required. Timing measurements should meet projections, or the anomalies should be satisfactorily explained (Sections 2.1, 2.3.3, and 2.3.4 of NUREG/CR-6083). Use of Part-Scale Prototypes In systems that have not been implemented and tested on a full scale, expected system delays on scale-up should be calculated and shown to be less than limiting system response times (Annex E of IEEE Std 7-4.3.2, and Sections 2.1.3 and 2.1.4 of NUREG/CR-6083). A basis should be provided that describes the effects of adding sensors, divisions, communication links, controllers, computer nodes, or actuation devices required to scale the test system to full scale. Test data should confirm scaling as well as performance projections. Exceptions are considered anomalies or abnormal events (Annex F of IEEE Std 7-4.3.2). Prototypes designed to demonstrate scaling should include all significant architectural elements plus enough additional elements to show the scaling effects to be measured. 4. Review Procedures Based on review of the available information and applicant/licensee commitments, the reviewer should reach a conclusion appropriate to the level of detail and type of submittal. For certified designs under 10 CFR Part 52, or preliminary SARs or topical reports, the level of detail will typically include only information to verify limiting response times, digital computer timing requirements, architecture, and design commitments. For this level of detail, the reviewer verifies that system timing requirements calculated from the design basis events and