ML21333A151
| ML21333A151 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 11/29/2021 |
| From: | Evergy, Wolf Creek |
| To: | Division of Operating Reactor Licensing |
| Lee S, 301-415-3168 | |
| References | |
| Download: ML21333A151 (13) | |
Text
Internal Use Only Pre-Submittal Meeting License Amendment Request Addressing:
Portable Lighting for Operator Manual Actions Jeff Suter DATE: January 10, 2022
Internal Use Only Wolf Creek credits 8-hour fixed emergency lighting (Big Beam) for illuminating safe shutdown equipment and access/egress paths to the equipment for the following:
- Fire requiring Control Room evacuation
- Fire outside the Control Room
- Non-fire event resulting in the loss of all AC power
2 Background
Internal Use Only Since spring of 2020 Wolf Creek has had numerous issues with individual reliability of 8-hour fixed emergency lighting units:
- Station Top Equipment Issue
- Maintenance Rule (a)(1)
- Flooded lead acid battery type battery used is maintenance intensive 3
Problem
Internal Use Only Resolution Plan Approved by Plant Health Committee:
1.
Replace existing flooded type lead-acid battery with a sealed battery of equivalent capacity that is less maintenance intensive.
2.
Submit a License Amendment Request (LAR) to the Nuclear Regulatory Commission requesting that in some instances portable lighting (hard hat mounted headlamps) be credited as the primary emergency lighting means for the illumination of safe shutdown equipment and access egress routes to the equipment.
Control Room and Auxiliary Shutdown Panel areas will continue to credit 8-hour fixed emergency lighting.
Remaining fixed emergency lighting will be downgraded to 1.5-hour Life Safety.
4
Internal Use Only Regulatory Requirement Wolf Creek is committed to the USAR 9.5E comparison response to 10 CFR 50 Appendix R:
5 10 CFR 50 Appendix R, Section III.J Wolf Creek USAR 9.5E Comparison
Response
Emergency lighting units with at least 8-hour battery power supply shall be provided in all areas needed for operation of safe shutdown equipment and in access and egress routes thereto.
The Power Block Complies. As stated in Section 9.5.3.2.3, emergency lighting units with eight hour batteries are located in all plant areas required for operation of safe shutdown equipment and also those areas necessary for access and egress.
Internal Use Only License Basis Facility Operating License Condition 2.C(5)(b) - The licensee may make changes to the approved fire protection program without prior approval of the Commission only if those changes would not adversely affect the ability to achieve and maintain safe shutdown in the event of a fire.
6 The proposed change to credit portable lighting in lieu of 8-hour fixed emergency lighting is considered a potentially adverse change that would require prior NRC review and approval.
Internal Use Only Precedent Plants with NFPA 805 fire protection license basis have evaluated the use of flashlights for illuminating operator actions in lieu of fixed emergency lighting.
Evaluations were approved as part of the NFPA 805 LAR submittal process.
7 Historically, via the exemption process, the NRC has approved limited use of flashlights in lieu of fixed 8-hour emergency lighting. Reference NRC Accession Numbers below:
Internal Use Only Portable Lighting Details 8
Dual light headlamp Lightweight and impact resistant LED lights Multiple methods for mounting to hardhat Uses rechargeable battery or two CR123 batteries Headlamp charging station Battery charge level indication
Internal Use Only Illumination Comparison - Headlamp to 8-Hour Big Beam
- Headlamp - rechargeable battery, discharged on Hight Spotlight
- Emergency light with AC power removed and single beam aimed at target
- Illumination levels at 5 ft. and 10 ft. from target measured in ft-candle 9
Internal Use Only Photos of Illumination Testing at 8-Hours 10 Big Beam Emergency Light Headlamp with Rechargeable Battery - High Spotlight Mode
Internal Use Only
- Existing fixed emergency lights will remain in place and aimed per current design but be downgraded to 1.5-hour Life Safety
- Spare batteries and headlamps will be strategically located in the plant
- Photoluminescent labels provided for post-fire safe shutdown equipment 11 Defense in Depth
Internal Use Only The resulting emergency lighting strategy will involve a diverse approach utilizing the following:
- 8-hour fixed battery units for locations required to be manned for safe shutdown support.
- Portable lighting for illuminating implementing procedures, safe shutdown equipment, and the access/egress routes to the equipment.
- 1.5-hour battery units for illuminating firefighting activities, life safety access/egress, and ancillary lighting to portable lighting 12 Conclusion
Internal Use Only 13 Questions?