NRC 2021-0028, Generic Letter 2004-02 Containment Sump Debris Transport Calculation Non-Conservatism
| ML21174A111 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 06/23/2021 |
| From: | Schultz E Point Beach |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GL 2004-02, NRC 2021-0028 | |
| Download: ML21174A111 (1) | |
Text
June 23, 2021 NRG 2021-0028 GL 2004-02 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington D C 20555-0001 RE: Point Beach Nuclear Plant, Units 1 and 2 Docket Nos. 50-266 and 50-301 Renewed Facility Operating Licenses DPR-24 and DPR-27 Generic Letter 2004-02 Containment Sump Debris Transport Calculation Non-Conservatism
References:
- 1. NextEra Energy Point Beach, LLC, letter, Updated Final Response to NRG Generic Letter 2004-02, December 29, 2017 (ADAMS Accession No. ML17363A253)
- 2. Public Meeting Regarding Path Forward for Generic Letter 2004-02 Closure for Point Beach Nuclear Plant Units 1 and 2, May 18, 2021 (ADAMS Accession No. ML21125A260)
In Reference 1, NextEra Energy Point Beach, LLC (NextEra) provided an updated final response to Generic Letter (GL) 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors, for the Point Beach Nuclear Plant, Units 1 and 2 (Point Beach).
In Reference 2, NextEra notified the NRG of its intent to pursue a risk-informed resolution to GL 2004-02 for Point Beach.
Subsequent to the meeting described in Reference 2, NextEra learned of a non-conservatism in calculations supporting the Reference 1 submittal. Specifically, the non-conservatism involved the modeling of a Containment sump strainer blockage scenario used to determine debris transport to the Point Beach Containment sumps which incorrectly applied the pool fill-up transport fractions for selected debris types, resulting in non-conservative debris quantities. However, the scenario containing the non-conservatism is not the limiting scenario evaluated in Reference 1 and does not affect current capabilities to perform required functions at Point Beach. The issue has been entered into the Point Beach Corrective Action Program (CAP). Moreover, the calculations containing the non-conservatism have been revised and updated debris transport fractions will be presented in the risk-informed resolution to GL 2004-02 proposed in Reference 2.
This letter contains no new regulatory commitments.
Should you have any questions regarding this notification, please contact me at 920-755-7854.
Eric Schultz, Licensing Manager NextEra Energy Point Beach, LLC cc: USNRC Regional Administrator, Region Ill Project Manager, USNRC, Point Beach Nuclear Plant Resident Inspector, USNRC, Point Beach Nuclear Plant Public Service Commission of Wisconsin