Document: NUREG-0800
Document ID: 030a527a-e2e7-4d90-b34f-4662fb984153
Document Type: srp
Title: STRATEGIES AND GUIDANCE TO ADDRESS LOSS OF LARGE AREAS OF
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1331/ML13316B202.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.4
CFR Part: 
CFR Title: 

Content:
g capabilities under the circumstances associated with LOLAs of the plant due to explosions or fire. Holders of COLs or operating licenses should ensure that reasonable controls on the availability of equipment needed to implement the strategies required by 10 CFR 50.54(hh)(2) are included in their procedures and guidance required by the rule. 24. Extensive Damage Mitigation Guidelines The plan should contain Extensive Damage Mitigation Guidelines (EDMGs). For purposes of developing EDMGs, The developer may assume that buildings containing 19.4-14 Revision 0 – June 2015 the control room and Class 1E vital electrical equipment (batteries, diesels, switchgear, etc.) at least 100 yards apart have adequate spatial separation. This 100 yard separation is measured from the outer wall or perimeter of the buildings (not the centerline of the building). When developing EDMGs for multi-unit sites that have control rooms and vital Class 1E electric power equipment in control buildings that have adequate spatial separation, the developer may assume that one control building will survive and the vital Class 1E electrical power in the undamaged control building will also survive. Technical Rationale 1. 10 CFR 50.54(hh)(2) states that each licensee shall develop and implement guidance and strategies intended to maintain or restore core cooling, containment, and SFP cooling capabilities under the circumstances associated with LOLAs of the plant due to explosions or fire, to include strategies in the following areas: (i) Fire fighting, (ii) Operations to mitigate fuel damage and (iii) Actions to minimize radiological release. The Commission’s statement of considerations for these requirements states that new reactor licensees must address core cooling, SFP cooling, and containment integrity by employing the same 14 general strategies that have been required through an operating license condition for current 10 CFR Part 50 power reactor licensees (74 FR 13926, 13957; March 27,