Document: NUREG-0800
Document ID: 21b37b7c-b45c-4247-b4a5-c2f28df75be4
Document Type: srp
Title: INSTRUMENTATION AND CONTROLS (Tier 1)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070663.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.5
CFR Part: 
CFR Title: 

Content:
ses for I&C equipment. The discussion should include (1) design processes and acceptance criteria to be used for safety-related systems using programmable microprocessor-based control equipment, (2) a program to assess and mitigate the effects of electromagnetic interference on I&C equipment, (3) a program to establish setpoints for safety-related instrument channels, and (4) a program to qualify safety-related I&C equipment for in-service environmental conditions. Tier 1 should address the hardware and software development process to be used in the design, testing, and installation of I&C equipment. Tier 1 includes the description of the design process to be followed for hardware and software development, design commitments, the inspections, tests, and analysis to be performed to verify that the design is consistent with the commitments, and the appropriate acceptance criteria 14.3.5-5 DRAFT Rev. 0 - April 1996 against which the design will be judged. This ITAAC describes attributes of the process to be used to develop the I&C systems as well as attributes of the final product. The ITAAC for software and hardware verifies the applicant's proposed design stages within the overall design process. The various stages are described in more detail in DCD Tier 2. An example of various design stages is given below. (1) Planning (2) Design definition (3) Software design (4) Software coding (5) Integration (6) Validation (7) Change control Tier 1 and DCD Tier 2 contain criteria which describe the method to develop plans and procedures that will guide the design process throughout the lifecycle stages. The ITAAC provides the acceptance criteria for verifying the design through the stages while SSAR adds the set of guidelines and standards that will provide more detailed criteria for the development of the design. Tier 1 should be written to incorporate the most impor- tant and general aspects (top-level requirements) from the standards. The set of standards and criteria in