ENS 55300
ENS Event | |
|---|---|
05:00 Jun 8, 2021 | |
| Title | Part 21 Initial Report - Deviation Identified in Bolting Utilized to Maintain Seismic Qualification: |
| Event Description | Pursuant to 10 CFR 21.21 (d)(3)(i), Paragon Energy Solutions is providing initial notification of the identification of a deviation.
Condition that requires evaluation: NLI 280-ton Custom Chillers, Serial Numbers XHX-0001A / XHX-0001B / XHX-0001C. The Chillers were originally supplied by Nuclear Logistics under PO: NU-02SR726683 in 2010. The original seismic qualification was questioned by plant personnel related to the size of the bolting utilized for the diagonal cross braces on the two lower chiller frames. Paragon performed a review and additional analysis of the original qualification report. It was confirmed that the bolting which was utilized to install the pinned diagonal braces on the condenser and compressor frame sections does not have a sufficient load bearing capacity to support the application loading during a seismic event. The upset and emergency loading for the diagonal brace is 5.59 kip and 8.59 kip, respectively. Compared to the load capacity of 2.32 kip and 3.09 kip for upset and emergency, respectively, for the 3/8" bolt in single-shear configuration with threads included in the shear plane. This condition does not affect normal operation of the chiller. However, this deviation has the potential to impact the ability to maintain structural integrity during a seismic event. Date of Discovery: 6/8/2021 Formal notification will be submitted on or before 7/8/2021. Paragon contact: Tracy Bolt, Chief Nuclear Officer, Paragon Energy Solutions, 817-284-0077, tbolt@paragones.com. This equipment was supplied to V.C. Summer Nuclear Station. |
| Where | |
|---|---|
| Paragon Energy Solutions Ft. Worth, Texas (NRC Region 4) | |
| Organization: | Paragon Energy Solutions |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+58.93 h2.455 days <br />0.351 weeks <br />0.0807 months <br />) | |
| Opened: | Tracy Bolt 15:56 Jun 10, 2021 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Jun 10, 2021 |
| 55300 - NRC Website | |
Paragon Energy Solutions with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 571432024-05-09T04:00:0009 May 2024 04:00:00
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