Document: NUREG-0800
Document ID: f03d2c71-27a1-41fd-9362-1e62c6142e13
Document Type: srp
Title: Containment Systems and Severe Accidents (Tier 1)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070653.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.11
CFR Part: 
CFR Title: 

Content:
be included in the system ITAAC or in a separate containment isolation system ITAAC that encompasses all CIVs. Leak rate testing of the CIVs should be addressed in Tier 1, and may be addressed in the containment ITAAC. 12. Heat loads requiring cooling, e.g., pump motors, heat exchangers, need not show the source of cooling unless the source of cooling has a specific or unique characteristic that would require Tier 1 treatment, e.g., RCP seal water cooling. C. STYLE GUIDELINES FOR DESIGN DESCRIPTIONS AND FIGURES 1. New terminology should be avoided, standard terminology should be used (i.e., use terms in common use in the CFR or Reg Guides vice redefining them). 2. Pressures should include units to indicate if the parameter is absolute, gage, or differential. 3. "LOCA signal" should be used vice specific input signals such as "High drywell" or "Low water level" because control systems generally processes the specific input signals and generate a LOCA signal that actuates the component. 4. In general, the term "ASSOCIATED" should be avoided because this term has particular meaning regarding electrical circuits and its use may lead to confusion. 5. Numbers should be expressed in metric units with English units in parentheses. 6. The design description should be consistent in the use of present or future tense. 7. "Division" should be used instead of train, loop, or subsystem (unless it is a subsystem). 8. "Tier 1" and "Tier 2" should not be used in the design description or ITAAC. 9. Systems should be described as "safety-related" and "nonsafety-related," not "essential" and "nonessential." 14.3-45 DRAFT Rev. 0 - April 1996 10. The correct system name should be used consistently. II. INSPECTIONS, TESTS, ANALYSES AND ACCEPTANCE CRITERIA (ITAAC) Normally, all design commitments in Tier 1 must be verified by a specific ITAAC entry, unless there are specific reasons why this is not necessary. A. STANDARD ITAAC ENTRIES See Appendix D to this SRP section. B. SYSTEM SPECIFIC