Reactor Enclosure Recirculation System (RERS)
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| | Site | Start date | Title | Description |
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| ENS 58049 | Limerick | 19 November 2025 08:28:00 | Loss of Reactor Enclosure Recirculation | The following is a summary of information provided by the licensee via phone and email:
On November 18, 2025, at 0328 CST, as the licensee was initiating the standby gas treatment system in support of planned maintenance on normal reactor building ventilation, the '2A' reactor enclosure recirculation system (RERS) fan failed to establish flow upon the system initiation signal. The '2B' RERS fan was previously inoperable due to a planned maintenance window. Technical specification action statement 3.6.5.4.B was entered with both Unit 2 RERS fans inoperable. The '2B' RERS fan was restored to operable at 0523 EST. The licensee returned normal reactor building ventilation to service to restore secondary containment differential pressure.
Due to inoperability of both RERS trains, the system was in a condition that could have prevented the fulfillment of a safety function; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72.(b)(3)(v)(C).
The licensee reported there was no impact to the health and safety of the public or plant personnel. The NRC Resident Inspector was notified.
- * * RETRACTION ON 01/08/2026 AT 0838 EST FROM BRAD SMITH TO ROBERT THOMPSON * * *
The following information was provided by the licensee via phone and email:
Limerick completed a review and confirmed that '2B' RERS fan operability was established following routine maintenance, prior to the '2A' RERS fan being declared inoperable.
Consequently, the '2B' RERS fan remained capable of performing its safety-related function during the period when the '2A' RERS fan was unavailable, thereby ensuring the overall RERS safety function was maintained. As such, no condition existed that would have prevented the fulfillment of a safety function. Based on this assessment, event notification 58049 is being retracted.
The NRC Senior Resident Inspector has been notified.
Notified R1DO (Seeley). | | ML24017A302 | Limerick | 14 December 2023 | Post Exam Comments Resolution | | | ML23248A208 | Limerick | 31 August 2023 | UFSAR Cover Page | | | ML22278A215 | Limerick | 19 September 2022 | Rev. 21 to Updated Final Safety Analysis Report, Chapter 06, Sections 3 Thru 7 | | | ML22278A220 | Limerick | 19 September 2022 | Rev. 21 to Updated Final Safety Analysis Report, Chapter 7, Instrumentation and Control Systems | | | ML22278A285 | Limerick | 19 September 2022 | Rev. 21 to Updated Final Safety Analysis Report, Chapter 15, Sections 15.6 Through 15.12 | | | ML22278A206 | Limerick | 19 September 2022 | Rev. 21 to Updated Final Safety Analysis Report, Chapter 1, Introduction and General Description of Plant | | | ML22278A227 | Limerick | 19 September 2022 | Rev. 21 to Updated Final Safety Analysis Report, Chapter 7, Instrumentation and Control Systems | | | ML22278A202 | Limerick | 19 September 2022 | Rev. 21 to Updated Final Safety Analysis Report, Chapter 01 (003) Sections 7-12 | | | ML22278A248 | Limerick | 19 September 2022 | Rev. 21 to Updated Final Safety Analysis Report, Chapter 06, Engineered Safety Features, Table of Contents | |
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