Document: NUREG-0800
Document ID: 80fe9eee-2d6e-4a7e-b7dd-ec23aab2d39f
Document Type: srp
Title: STRATEGIES AND GUIDANCE TO ADDRESS LOSS OF LARGE AREAS OF
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1211/ML121110138.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.4
CFR Part: 
CFR Title: 

Content:
Currently Licensed Power Reactor Sites and Related Staff Positions 1. In November of 2007, the Pressurized Water Reactor (PWR) Owners Group issued recommendations that directly affect three of the PWR strategies that could be used in responding to Beyond Design Basis Events addressed by 10 CFR 50.54(hh)(2). The three strategies are included in NEI 06-12, Revision 3. They are as follows: 1) Manually Depressurize Steam Generator (SG) to Reduce Inventory Loss (Section 3.3.2); 2) Manual Operation of Turbine Driven (or diesel-driven) Auxiliary Feedwater Pump (Section 3.3.3); and 3) Manually Depressurize SGs and Use Portable Pump (Section 3.3.4). Staff Position Applicants for COLs or operating licenses utilizing a PWR should review the recommendations from the PWR Owners Group, and where applicable, consider them in the development of strategies and guidance. The strategies should be described in the application in a manner consistent with guidance in Appendix D of NEI 06-12, Revision 3 and subsequently implemented in the site procedures by the licensee. 2. As described in the November 2007, PWR Owners Group recommendations, being able to measure SG level at facilities currently operating can be vital to successful implementation of SG strategies, in Sections 3.3.2, 3.3.3, and 3.3.4 of NEI 06-12, Revision 3. The SG level in currently operating PWRs can be measured by using a battery operated differential pressure transmitter calibration device. These devices are relatively small and portable and only need to be connected to the differential transmitter electrical terminals, either locally at the transmitter or at the containment electrical penetration, if the transmitters are located in the containment. The output from the calibration device is multiplied by a calibration factor to give SG level. Staff Position Applicants for COLs or operating licenses utilizing a design similar to current operating PWRs that adopt strategies in Section 3.3.2, 3.3.3, or 3.3.4 of NEI