Document: NUREG-0800
Document ID: d563bf0f-7b24-4ff5-99a2-4f822eb86bd9
Document Type: srp
Title: INTERLOCK SYSTEMS IMPORTANT TO SAFETY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052360612.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.6
CFR Part: 
CFR Title: 

Content:
The drawing review should confirm that the design and layout meet the applicable criteria listed under subsection II. A site visit should be performed before the evaluation findings are written for an OL. The site visit should include an audit verification that the design and layout criteria reviewed during the drawing review are implemented. An outline of topics for a site visit is provided in Appendix 7-B (Ref. 6) to SRP Chapter 7. In certain instances, it will be the reviewer's judgment that for a specific case under review, emphasis should be placed on specific aspects of the design, while other aspects of the design need not receive the same emphasis and indepth review. Typical reasons for such a nonuniform placement of emphasis are the introduction of new design features or the utilization in the design of design features previously reviewed and found acceptable. However, in all cases, the review must be sufficient to conclude conformance to the acceptance criteria, i.e., the requirements of the Commission's regulations. IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided and the review supports conclusions of the following type, to be included in the staff's safety evaluation report: The staff concludes that the design of the interlock systems impor- tant to safety are acceptable and meet the relevant requirements of General Design Criteria 2 and 4. This conclusion is based on the following: The review of the interlock systems important to safety included the interlocks to prevent overpressurization of low pressure systems when connected to the primary coolant system. The staff position with regards to this interlock system is set forth in Branch Technical Position ICSB-3, "Isolation of Low Pressure Systems from the High Pressure Reactor Coolant System." Based on our review, we conclude that the design of this system satifies the staff's guidelines. Our review included the interlock provided to prevent overpressur-