Document: NUREG-0800
Document ID: 92d817ac-3ce3-4cf7-8d1a-627e8242fbf2
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070312.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
wn is required. 12. Assurance should be provided that the control room will be habitable and its equipment functional after a steam line or feedwater line break or that the capability for shutdown and cooldown on the unit(s) will be available in another habitable area. 13. Environmental qualification should be demonstrated by test for that electrical equipment required to function in the steam-air environment resulting from a high energy line break. The information required for our review should include the following: (a) Identification of all electrical equipment necessary to meet requirements of (11) above. The time after the accident in which they are required to operate should be given. (b) The test conditions and the results of test data showing that the systems will perform their intended function in the environment resulting from the postulated 3.6.1-23 DRAFT Rev. 3 - April 1996 accident and time interval of the accident. Environmental conditions used for the tests should be selected from a conservative evaluation of accident conditions. (c) The results of a study of steam systems identifying locations where barriers will be required to prevent steam jet impingement from disabling a protection system. The design criteria for the barriers should be stated and the capability of the equipment to survive within the protected environment should be described. (d) An evaluation of the capability for safety-related electrical equipment in the control room to function in the environment that may exist following a pipe break accident should be provided. Environmental conditions used for the evaluation should be selected from conservative calculations of accident conditions. (e) An evaluation to assureensure that the onsite power distribution system and onsite sources (diesels and batteries) will remain operable throughout the event. 14. Design diagrams and drawings of the steam and feedwater lines, including branch lines showing the routing from containment to the