Document: NRC Regulatory Guide
Document ID: bbd6ed7f-058c-4bd2-8849-f708d0179bbf
Document Type: regulatory_guide
Title: Flexible Mitigation Strategies for Beyond-Design-Basis Events + HISTORY - HISTORY 11/2015 – DG-1301 , Proposed Revision 0
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1316/ML13168A031.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.226
CFR Part: 
CFR Title: 

Content:
cting the storage locations for that equipment and the prioritization of resources to initiate their use. Staff Position: NEI 12-06, Rev. 1A, Section 3.0, provides an acceptable method for determining the baseline coping capabilities for the initial response phase. 1.1.1.2. Transition Phase The transition phase will be accomplished by supplementing the use of installed equipment with portable equipment stored on-site. The strategies for this phase must be capable of maintaining core cooling, containment, and SFP cooling capabilities (following their restoration, if applicable) from the time they are implemented until they can be supplemented by offsite resources in the final phase. The duration of the transition phase should provide sufficient overlap with both the initial and final phases to account for the time it takes to install equipment and for uncertainties. Staff Position: NEI 12-06, Rev. 1A, Section 3.0, provides an acceptable method for determining the baseline coping capabilities for the transition phase. 1.1.1.3. Final Phase The final phase will be accomplished using the portable equipment stored on-site augmented with additional equipment and consumables obtained from off-site until power, water, and coolant injection systems are restored or commissioned. Staff Position: NEI 12-06, Rev. 1A, Section 3.0, provides an acceptable method for determining the baseline coping capabilities for the final phase. NEI 12-06, Rev. 1A, Section 12.2, provides an acceptable method for establishing the capability to obtain equipment and consumables from off- site until power, water, and coolant injection systems are restored or commissioned. 1.2. Contingencies for Loss of All Alternating Current Power NEI 12-06, Rev. 1A, Section 3.2.2 provides 17 guidelines for use in the development of the guidance and strategies under 10 CFR 50.155(b)(1). Guideline (2) of this sections states: “Plant procedures/guidance should recognize the importance of AFW/HPCI/RCIC/IC during the