Document: NUREG-0800
Document ID: ac3185c1-0851-4b4d-b3f5-31c884360119
Document Type: srp
Title: Setpoints
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A088.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.2
CFR Part: 
CFR Title: 

Content:
GDC 44, “Cooling Water” “A system to transfer heat from structures, systems, and components important to safety, to an ultimate heat sink shall be provided....” Applicability - ESF, interlock, and control I&C systems. Review Methods - GDC 44 imposes functional requirements on I&C systems provided to initiate, control and protect the integrity of cooling water systems important to safety. Relevant I&C systems might include, for example, systems to initiate or realign flow paths for service water or component cooling water systems or interlocks provided to ensure proper system alignment during plant operation. The review should confirm that the I&C systems provide the functions, performance, and reliability necessary to initiate and control the cooling water systems such that the functions important to safety described in GDC 44 are achieved. This review is coordinated with the organization responsible for the review of containment systems. 3. Staff Requirements Memoranda Note: This section quotes positions that are extracted from SRM and the associated SECY papers. Specific positions are not necessarily separated from explanatory Appendix 7.1-A-26 Revision 6 – August 2016 material in these documents. The quotes given here do not include the explanatory material provided in the SECY or SRM. The quotes may also combine material from the SRM and SECY to fully represent the NRC position. (a) Item II.Q, “Defense against Common-Mode Failures in Digital Instrumentation and Control Systems,” of SRM on SECY-93-087, “Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor (ALWR) Designs,” dated July 21, 1993. (1) The applicant should assess the diversity and defense-in-depth of the proposed I&C system to demonstrate that vulnerabilities to common- cause failures have adequately been addressed. (2) In performing the assessment, the vendor or applicant should analyze each postulated common-cause failure for each event