ML24365A117
| ML24365A117 | |
| Person / Time | |
|---|---|
| Site: | Ginna, Vogtle  |
| Issue date: | 12/28/2024 |
| From: | Rumora Z AMETEK, Paragon Energy Solutions |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| EN 57483 | |
| Download: ML24365A117 (1) | |
Text
From:
Zachary Rumora To:
Hoc, HOO X Cc:
Ethan Salsbury
Subject:
[External_Sender] AMETEK Solidstate Controls Interim Part 21 Notification Date:
Saturday, December 28, 2024 11:00:44 AM Attachments:
Interim 10CFR Part 21 Notification.pdf
- Hello,
AMETEK Solidstate Controls is submitting the attached interim report/notification of a potential defect in compliance with 10CFR21. Please confirm receipt and feel free to contact me or Ethan Salsbury with any additional questions. Our contact info is below.
Email: Zachary.Rumora@ametek.com Office: (614) 410-6210 Cell: (614) 974-6734
Email: Ethan.Salsbury@ametek.com Office: (614) 410-6293 Cell: (419) 206-1283
- Best,
Zach Rumora Quality and EHS Manager
SOLIDSTATE CONTROLS - PRESTOLITE POWER - HDR 875
Dearborn Drive lColumbus,
OH 43085 lwww.solidstatecontrolsinc.com O: +1 614 846 7500 x 6210 lD: +1 614 410 6210 lZachary.Rumora@ametek.com
02-190147 Rev. A Page 1 of 4 SOLIDSTATE CONTROLS Quality Assurance 875
Dearborn Drive,
Columbus, OH 43085 U.S.A.
Telephone: 614-846-7500 E-mail: Zachary.Rumora@ametek.com December 28, 2024 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Attention:
Document Control Desk
Subject:
Notification of Potential Defect - 10CFR Part 21 Product:
Regulating Transformer Models 85-IS0075-12 and 85-IS0150-14 AMETEK Solidstate Controls Inc. is submitting the following Interim Report of a Potential Defect discovered on 10/29/2024 in accordance with the requirements of 10CFR Part 21.
Please contact me if you require any further information.
Sincerely, Zach Rumora Quality Manager Ametek Solidstate Controls
02-190147 Rev. A Page 2 of 4 COMPONENT DESCRIPTION:
The AMETEK SCI model numbers listed are for regulating transformers that are intended to take in AC power and output AC power at 120V +/- 2% with low harmonic distortion. The specifications for each model is below:
85-IS0075-12 o Input: 460VAC +/- 10%
o Input Current: 24A Max o Input Phase: Single Phase o Input Frequency: 60Hz +/- 0.5%
o Output Voltage: 120VAC +/- 2%
o Output Phase: Single Phase o Output Frequency: 60Hz 85-IS0150-14 o Input: 460VAC +/- 10%
o Input Current: 44A Max o Input Phase: Single Phase o Input Frequency: 60Hz +/- 0.5%
o Output Voltage: 120VAC +/- 2%
o Output Phase: Single Phase o Output Frequency: 60Hz PROBLEM YOU COULD SEE:
During operation the transformer inside of these systems may experience a breakdown in which electricity is able to short from the coils to ground, typically via the transformer core. This may present thermally via increased temperature readings obtained from thermal probes or IR guns, and/or visibly through severe darkening or charring of the coils, magnetic shunts, or core.
EFFECT ON SYSTEM PERFORMANCE:
Once short circuiting of the coils occurs the system is no longer able to provide regulated output power and needs to be shutdown to prevent further damage to the rest of the unit.
CAUSE:
It is unknown at this time what is causing the short circuiting reported. At this time the resin has been evaluated and found to meet the required 220°C insulation system given acceptable hot spot temperature is 200°C. At a maximum ambient temperature of 40°C this would require a temperature rise of 160°C. Factory test results from 2016 for unit 96000101-0415 and -0915 showed a temperature rise of 116°C and 131°C, respectively.
Further analysis of the impact of failures of other system components is ongoing. This includes but is not limited to: capacitors, wire harnesses, and transformer materials. Further electrical testing of the regulating transformer systems and their individual transformers in isolation is also in process.
ACTION REQUIRED:
It is recommended that units currently in service are monitored for excessive temperature
(>180°C or >355°F). Units found to have temperatures above this threshold should be considered for removal from service. If this is not possible, the units should have their routine monitoring/maintenance cadence increased to monitor for signs of deterioration in the insulation system of the transformer. These signs may include increased audible noise from the units, blackening on any areas of the transformer, or signs of electric shorting (between windings or coil to core). Appendix A lists the currently known population of units distributed as safety related.
02-190147 Rev. A Page 3 of 4 AMETEK SOLIDSTATE CONTROLS CORRECTIVE ACTION:
The evaluation of these systems (as detailed in the cause section) is currently scheduled to be completed by or before January 31st, 2025 with further information on required corrective action(s) to follow by or before February 7th, 2025.
02-190147 Rev. A Page 4 of 4 Appendix A Affected Site Site Purchase Order AMETEK SCI Sales Order Model Quantity Southern Nuclear Company
- Vogtle SNG31574-0144 SNG31574-0144 SNG31574-0144 SNG31574-0200 SNG31574-0200 SNG31574-0197 SNG31574-0197 SNG31574-0226 SNG31574-0336 SNG31574-0414 SNG10332311 96000101 96000101 96000101 96000136 96000136 96000138 96000138 96000144 96000173 96000190 96000193 85-IS0150-14 85-IS0150-14 85-IS0075-12 85-IS0150-14 85-IS0150-14 85-IS0075-12 85-IS0075-12 85-IS0150-14 85-IS0150-14 85-IS0150-14 85-IS0150-14 2
4 3
1 2
4 3
1 1
5 2
Constellation Energy - Ginna 602585 96000125 85-IS0075-12 1