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:
it exists. Then any special features to deal with this feature should be covered. 16. Post TMI requirements - e.g., power to PORV block valve, Pressurizer heaters, etc. B. ITAAC ENTRIES (for the above equipment) The standard ITAAC entries for electrical systems in Appendix D to this SRP section should be used to the extent possible. 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. 1. BASIC CONFIGURATION ITAAC (See also Appendix D) General functional arrangement - this is captured in the basic configuration standard ITAAC, but the level of detail is determined by the design description and what is shown on any figure(s). Qualification of components - qualification of SSCs for seismic and harsh environment is covered by the basic configuration ITAAC. Tier 1 will only deal with electrical equipment in harsh environments. Electrical equipment in a "mild" environment will be treated in Tier 2 only. An exception is made for I&C state-of-the-art digital equipment in "other than harsh" environment, which I&C ITAAC will cover. Since there is some of this type equipment which may be utilized in the electrical distribution systems, the I&C ITAAC should cover this potential. The basis for this exception is that recent I&C equipment in "mild" environments has some operating experience that shows sensitivity particularly to temperature, and new digital equipment may have even more sensitivity. 2. INDEPENDENCE - include separation, inter-ties (if any), identification (e.g., color coding), location, non-Class 1E loads on 1E buses. This may be covered by the divisional power supply and physical separation standard ITAAC in Appendix D to this SRP section. 14.3-55 DRAFT Rev. 0 - April 1996 3. CAPACITY AND CAPABILITY - sizing of sources and distribution equipment, Loading - analyses to demonstrate the capacities of the equipment because this is important to accomplishing the safety