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| ==Subject:== | | ==Subject:== |
| Potential Part 21 on Siemens 401-158 Safety Clip Pursuant to the requirements of lOCFR Part 21, this letter notifies the NRC of a potential Part 21 condition. The subject Safety Clip is used in medium voltage circuit breakers. The subject circuit breakers are manufactured as a commercial grade item by Siemens Industry Inc. and dedicated for use as a basic component by National Technical Systems (NTS). Affected circuit breakers are 350 MVA Siemens Type 3AF. The Safety Clip in question is made of black finish steel and retains the Close Pawl Roller. During an inspection at Wolf Creek Nuclear Operating Company, the subject Safety Clips, were found cracked, broken, missing, or degraded after 600 to 850 operations. If the Safety Clip breaks and falls off and the washers and roller pawl outside bearing and race fall off, then future circuit breaker close operations beyond the next close cycle may not be assured. National Technical Systems has provided the 350 MVA Siemens Type 3AF circuit breakers to WCNOC Wolf Creek, PSEG Nuclear LLC Salem, and Entergy ANO. NTS will contact each utility and recommend that Safety Clip part number 401-158 be inspected and replaced with Safety Clip part number 40115. This Safety Clip is a yellow zinc plated clip of different design, and no known problems exist with this Safety Clip on different type Siemens circuit breakers dedicated by NTS. NTS will perform a failure analysis to determine the nature of the 401-158 clip failure. NTS plans to complete this analysis by April 29, 2016. If you have any questions, please contact NTS' Senior Director of Nuclear Engineering and Test Services, Tom Brewington at (256) 716-4512 or email at tom.brewington@nts.com. Sincerely, .. ---*--------Megan Toomey Sr. Contracts Manager NTS Huntsville NTS Huntsville | | |
| | Potential Part 21 on Siemens 401-158 Safety Clip Pursuant to the requirements of lOCFR Part 21, this letter notifies the NRC of a potential Part 21 condition. |
| | The subject Safety Clip is used in medium voltage circuit breakers. |
| | The subject circuit breakers are manufactured as a commercial grade item by Siemens Industry Inc. and dedicated for use as a basic component by National Technical Systems (NTS). Affected circuit breakers are 350 MVA Siemens Type 3AF. The Safety Clip in question is made of black finish steel and retains the Close Pawl Roller. During an inspection at Wolf Creek Nuclear Operating |
| | : Company, the subject Safety Clips, were found cracked, broken, missing, or degraded after 600 to 850 operations. |
| | If the Safety Clip breaks and falls off and the washers and roller pawl outside bearing and race fall off, then future circuit breaker close operations beyond the next close cycle may not be assured. |
| | National Technical Systems has provided the 350 MVA Siemens Type 3AF circuit breakers to WCNOC Wolf Creek, PSEG Nuclear LLC Salem, and Entergy ANO. NTS will contact each utility and recommend that Safety Clip part number 401-158 be inspected and replaced with Safety Clip part number 40115. This Safety Clip is a yellow zinc plated clip of different design, and no known problems exist with this Safety Clip on different type Siemens circuit breakers dedicated by NTS. NTS will perform a failure analysis to determine the nature of the 401-158 clip failure. |
| | NTS plans to complete this analysis by April 29, 2016. If you have any questions, please contact NTS' Senior Director of Nuclear Engineering and Test Services, Tom Brewington at (256) 716-4512 or email at tom.brewington@nts.com. |
| | Sincerely, |
| | .. ---*--------Megan Toomey Sr. Contracts Manager NTS Huntsville NTS Huntsville |
| * 7800 Highway 20 West | | * 7800 Highway 20 West |
| * Huntsville, AL 35806 * (256) 837-4411 | | * Huntsville, AL 35806 * (256) 837-4411 |
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Line 34: |
|
| |
|
| ==Subject:== | | ==Subject:== |
| Potential Part 21 on Siemens 401-158 Safety Clip Pursuant to the requirements of lOCFR Part 21, this letter notifies the NRC of a potential Part 21 condition. The subject Safety Clip is used in medium voltage circuit breakers. The subject circuit breakers are manufactured as a commercial grade item by Siemens Industry Inc. and dedicated for use as a basic component by National Technical Systems (NTS). Affected circuit breakers are 350 MVA Siemens Type 3AF. The Safety Clip in question is made of black finish steel and retains the Close Pawl Roller. During an inspection at Wolf Creek Nuclear Operating Company, the subject Safety Clips, were found cracked, broken, missing, or degraded after 600 to 850 operations. If the Safety Clip breaks and falls off and the washers and roller pawl outside bearing and race fall off, then future circuit breaker close operations beyond the next close cycle may not be assured. National Technical Systems has provided the 350 MVA Siemens Type 3AF circuit breakers to WCNOC Wolf Creek, PSEG Nuclear LLC Salem, and Entergy ANO. NTS will contact each utility and recommend that Safety Clip part number 401-158 be inspected and replaced with Safety Clip part number 40115. This Safety Clip is a yellow zinc plated clip of different design, and no known problems exist with this Safety Clip on different type Siemens circuit breakers dedicated by NTS. NTS will perform a failure analysis to determine the nature of the 401-158 clip failure. NTS plans to complete this analysis by April 29, 2016. If you have any questions, please contact NTS' Senior Director of Nuclear Engineering and Test Services, Tom Brewington at (256) 716-4512 or email at tom.brewington@nts.com. Sincerely, .. ---*--------Megan Toomey Sr. Contracts Manager NTS Huntsville NTS Huntsville | | |
| | Potential Part 21 on Siemens 401-158 Safety Clip Pursuant to the requirements of lOCFR Part 21, this letter notifies the NRC of a potential Part 21 condition. |
| | The subject Safety Clip is used in medium voltage circuit breakers. |
| | The subject circuit breakers are manufactured as a commercial grade item by Siemens Industry Inc. and dedicated for use as a basic component by National Technical Systems (NTS). Affected circuit breakers are 350 MVA Siemens Type 3AF. The Safety Clip in question is made of black finish steel and retains the Close Pawl Roller. During an inspection at Wolf Creek Nuclear Operating |
| | : Company, the subject Safety Clips, were found cracked, broken, missing, or degraded after 600 to 850 operations. |
| | If the Safety Clip breaks and falls off and the washers and roller pawl outside bearing and race fall off, then future circuit breaker close operations beyond the next close cycle may not be assured. |
| | National Technical Systems has provided the 350 MVA Siemens Type 3AF circuit breakers to WCNOC Wolf Creek, PSEG Nuclear LLC Salem, and Entergy ANO. NTS will contact each utility and recommend that Safety Clip part number 401-158 be inspected and replaced with Safety Clip part number 40115. This Safety Clip is a yellow zinc plated clip of different design, and no known problems exist with this Safety Clip on different type Siemens circuit breakers dedicated by NTS. NTS will perform a failure analysis to determine the nature of the 401-158 clip failure. |
| | NTS plans to complete this analysis by April 29, 2016. If you have any questions, please contact NTS' Senior Director of Nuclear Engineering and Test Services, Tom Brewington at (256) 716-4512 or email at tom.brewington@nts.com. |
| | Sincerely, |
| | .. ---*--------Megan Toomey Sr. Contracts Manager NTS Huntsville NTS Huntsville |
| * 7800 Highway 20 West | | * 7800 Highway 20 West |
| * Huntsville, AL 35806 * (256) 837-4411 | | * Huntsville, AL 35806 * (256) 837-4411 |
| * Fax: (256) 830-2109 | | * Fax: (256) 830-2109 |
| * www.nts.com}} | | * www.nts.com}} |
|
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Category:Deficiency Report (per 10CFR50.55e and Part 21)
MONTHYEARML23066A2212023-03-0707 March 2023 Velan, Inc. - Revised Part 21 Notification Re Butterfly Valves Found to Have a Number of Fasteners Loose ML23038A0192023-02-0606 February 2023 Curtiss-Wright Part 21 Notification for Qualtech Np Supplied Eaton TMR5 Timing Relays ML23011A0622023-01-11011 January 2023 Written Part 21 Notification of a Defect Associated with Imi CCI Supplied Main Steam and Main Feedwater Isolation Valves ML22220A2362022-08-0202 August 2022 Leonardo DRS, 16-AAT907B Power Supply 10 CFR Part 21 Notification ML21260A0072021-09-0909 September 2021 Ametek Solidstate Controls, Notification of Potential Defect - 10CFR Part 21 Report Re Omron Timer Relay ML20366A0472020-11-18018 November 2020 Curtiss-Wright 10 CFR Part 21 Notification for SF-1154 Hydraulic Fluid Batch 17BLVS293 ML19346H8732019-12-12012 December 2019 Westinghouse Electric Company - Notification of the Potential Existence of Defect Pursuant to 10 CFR Part 21 ML19347A4262019-12-10010 December 2019 General Atomics - Reportable Occurrence Under 10CFR21: Reported Failure in Analog High Range Radiation Monitor (RP-2C) 0CAN101902, CFR Part 21 Notification, Ite/Gould Relay2019-10-30030 October 2019 CFR Part 21 Notification, Ite/Gould Relay ML19317D0932019-10-25025 October 2019 Engine Systems, Inc., 10CFR21 Reporting of Defects and Non-Compliance - Engine Systems, Inc. Report No. 10 CFR21-0127, Rev. 0, Emd Fuel Injectors - Seized Plunger and Bushing ML19168A0122019-05-31031 May 2019 Paragon Energy Solution LLC-10 CFR Part 21 Report of Defect GS2 Terry Turbine Introl Positioners ML19080A0592019-03-0808 March 2019 Interim Report of Potential 10CFR Part 21, Eaton A200 Series Starters/Contactors ML19002A2042018-12-21021 December 2018 to Engine Systems, Inc., Part 21 Report Re Emd Fuel and Soakback Pumps - Potentially Undertorqued Cover Bolts ML18354A7422018-12-0404 December 2018 Engine Systems, Inc., Submittal of 1OCFR21 Reporting of Defects and Non-Compliance - Report No. 1OCFR21-0123, Rev. 0 - Emo Fuel and Soakback Pumps - Potentially Undertorqued Cover Bolts ML18081A1192018-03-15015 March 2018 Rosemount Nuclear Instruments, Inc., Submittal of Notification Under 10 CFR Part 21 for Certain Model 1154 and Model 1154 Serles H Pressure Transmitters and 01154-0153-0002 Amplifier Circuit Card Assemblies ML18039A2922018-01-24024 January 2018 Velan, Inc. - Corrected Notification for 4NPS Class 150 Through 900 Swing Check Valve Disc (Part Number 8205-012) ML18024A0032018-01-16016 January 2018 Velan Inc. - Part 21 Notification for Disc (Part Number 8205-012) in 4NPS Class 150 Through 900 Swing Check Valve ML17286A0242017-10-11011 October 2017 Part 21 on Siemens 5-3AF-GER-350-1200-78 & 5-3AF-GEU-350-1200-78 Circuit Breakers ML17194A8252017-07-11011 July 2017 Part 21 Report Re Wedge Pin Failure in Anchor Darling Motor Operated Double Disc Gate Valves with Threaded Stem to Upper Wedge Connections ML17114A0702017-04-13013 April 2017 Part 21 Notification - Identified Fisher 546S Electro-Pneumatic Transducers Standard Mounting Brackets Failed Seismic Testing Standards ML17104A2882017-04-13013 April 2017 Emerson Process Management, LLC - Fisher Information Notice, (FIN) 2017-02 ML17081A4532017-03-20020 March 2017 Part 21 - Plastic Jar Dedication Sampling ML17026A4142017-01-20020 January 2017 C&D Technologies, Inc. - Part 21 - Plastic Jar Dedication Sampling ML17019A3512017-01-10010 January 2017 Submittal of 10CFR21 Reporting of Defects and Non-Compliance Rev. 0, Emo Fuel Injector ML16321A4512016-10-21021 October 2016 Part 21 Reporting of Defects and Noncompliance ML16294A2642016-10-18018 October 2016 Part 21 Report - Defective Current to Pressure Transducers ML16281A2712016-09-30030 September 2016 Part 21 - Safety Related Component Welding by an Unqualified Welder ML16281A2702016-09-22022 September 2016 Part 21 - Initial Notification of Masterpact Breaker Fail to Close ML16278A4712016-09-22022 September 2016 Notification of 10 CFR Part 21 Condition, Masterpact Breaker Fail to Close ML16243A4752016-08-26026 August 2016 Part 21 Safety Related Component Welding by an Unqualified Welder ML16243A4722016-08-25025 August 2016 Part 21 Reporting of Defects and Noncompliance ML16229A4442016-08-15015 August 2016 Potential Part 21 on Safety Clip, Siemens Part Number 401158 ML16196A0652016-07-0909 July 2016 Part 21 Report - Nonconformance on Struthers-Dunn Relay for Psge Nuclear LLC ML16203A1792016-07-0707 July 2016 Curtiss-Wright 10 CFR Part 21 Report Regarding Disposition of a Nonconformance on Struthers-Dunn Relay Part Number B225XCXP125V Supplied to PSEG Nuclear, LLC ML16188A3742016-06-30030 June 2016 Part 21 - Inadequate Swaging and Adherence of Silicone O-Ring and Silicone PAD Soft Seat Main Disc and Pilot Disc Assemblies ML16162A6792016-06-0808 June 2016 Part 21 Report - Nonconformance on Struthers-Dunn Relay for PSEG Nuclear LLC ML16139A8312016-05-13013 May 2016 Part 21 Notification - Potential Defect Applicable to Hytork XL1126 Pneumatic Actuators ML16139A8342016-05-10010 May 2016 Electroswitch - Transmittal of 10CFR Part 21 Reporting of Defects and Noncompliance Regarding Vendor Inspection of Electroswitch Corporation Docket No. 99900833 ML16126A1112016-04-29029 April 2016 National Technical Systems (Nts) Request for Extension, for Potential Part 21 on Safety Clip, Siemens Part Number 401-158 ML16125A3602016-04-26026 April 2016 Part 21 - Hydraulic Snubber Seal Material Deviation Interim Report ML16098A4452016-03-22022 March 2016 Part 21 Notification - Sense and Transfer Module Resistive Short ML16112A2102016-03-14014 March 2016 National Technical Systems - Potential Part 21 on Siemens 401-158 Safety Clip, Per Wolf Creek, Salem, and Arkansas Nuclear One ML15134A0182015-05-0707 May 2015 Part 21 Report Regarding Struthers Dunn Relays with Contact Resistance Greater than One Ohm ML15146A0222015-05-0707 May 2015 Qualtech Np - Potential 1O CFR Part 21 Notification on Struthers Dunn Relays ML15103A4852015-04-0707 April 2015 Itt Engineered Valves - 2nd Interim Report to the NRC of 10 CFR 21 Event 50285, Reported by Itt 07/18/14 Concerning M I Diaphragms, Customer Testing ML15089A4352015-03-27027 March 2015 Part-21 Notification - Sense and Transfer Module Resistive Short ML15049A4582015-02-0606 February 2015 Thermo Gamma-Metrics, LLC - Part 21 Report Regarding Shutdown Margin Monitor Environmental Qualification Noncompliance ML15022A6502015-01-20020 January 2015 Letter from Steven R. Eisenberg USNRC 10CFR Part 21 Notification ML14351A3082014-12-16016 December 2014 10 CFR Part 21 Notification for a Defect in LOCA Analyses for B&W Plants ML14337A0952014-11-25025 November 2014 Part 21 - Defect in LOCA Analysis for B&W Plants 2023-03-07
[Table view] Category:Letter
MONTHYEARIR 05000272/20230042024-02-0505 February 2024 Integrated Inspection Report 05000272/2023004 and 05000311/2023004 ML24009A1022024-01-26026 January 2024 Exemption from Select Requirements of 10 CF Part 73 (EPID L-2023-LLE-0045 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting)) ML24025A0992024-01-25025 January 2024 Withdrawal of Request for Exemption from Specific 10 CFR Part 73 Requirements ML23326A0392024-01-24024 January 2024 Issuance of Amendment No. 281 Revision to Technical Specifications to Adopt TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b ML24018A0792024-01-22022 January 2024 Individual Notice of Consideration of Issuance of Amendment to Renewed Facility Operating License, Proposed Nshcd and Opportunity for a Hearing (EPID L-2024-LLA-0007) (Letter) IR 05000272/20234012024-01-22022 January 2024 Material Control and Accounting Program Inspection Report 05000272/2023401 and 05000311/2023401 ML24018A1382024-01-18018 January 2024 Inservice Inspection Request for Information ML24018A2482024-01-18018 January 2024 License Amendment Request to Modify the Implementation Date of License Amendment No. 238 ML24017A1582024-01-17017 January 2024 Submittal of Emergency Plan Revision 50 IR 05000482/20230042024-01-11011 January 2024 Integrated Inspection Report 05000482/2023004 IR 05000313/20234202024-01-10010 January 2024 Security Baseline Inspection Report 05000313/2023420 and 05000368/2023420 ML24004A1542024-01-0808 January 2024 Notification of Conduct of a Fire Protection Team Inspection ML23356A0722024-01-0404 January 2024 Supplemental Information Needed for Acceptance of Requested Licensing Actions Exemption from Specific 10 CFR Part 73N Requirements (EPID L-2023-LLE-0048) (Redacted Version) IR 05000313/20234022024-01-0202 January 2024 Security Baseline Inspection Report 05000313/2023402 and 05000368/2023402 WO 23-0002, Operating Corp., Summary of Actions Implemented for EA-18-165, Confirmatory Order, NRC Inspection Report 05000482/2019010 and NRC Investigation Report 4-2018-0082023-12-26026 December 2023 Operating Corp., Summary of Actions Implemented for EA-18-165, Confirmatory Order, NRC Inspection Report 05000482/2019010 and NRC Investigation Report 4-2018-008 ML23349A1672023-12-21021 December 2023 Request for Withholding Information from Public Disclosure ML23354A0022023-12-21021 December 2023 Request for Withholding Information from Public Disclosure ML23348A3662023-12-18018 December 2023 Notification of an NRC Fire Protection Baseline Inspection (NRC Inspection Report 05000482 2024012) and Request for Information ML23348A3572023-12-14014 December 2023 Application to Revise Technical Specifications to Use Online Monitoring Methodology Slides and Affidavit for Pre-Submittal Meeting ML23340A1592023-12-13013 December 2023 Entergy Operations, Inc. - Entergy Fleet Project Manager Assignment ML23352A0292023-12-13013 December 2023 Entergy - 2024 Nuclear Energy Liability Evidence of Financial Protection IR 05000313/20234052023-12-12012 December 2023 Security Baseline Inspection Report 05000313/2023405 and 05000368/2023405 ML23341A0832023-12-11011 December 2023 Material Control and Accounting Program Inspection Report 05000313/368/2023404- Cover Letter ML23305A0922023-12-0707 December 2023 Summary of Regulatory Audit Regarding License Amendment Request to Revise Technical Specifications to Adopt TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times RITSTF Initiative 4b LR-N23-0079, Special Report 23-02-00 Pursuant to the Requirements of Salem Unit 1 Technical Specification 3.3.3.7, Action 10, for the Unit 1 Main Steam Line Rad Monitor Inoperable for Greater than Seven Days2023-12-0707 December 2023 Special Report 23-02-00 Pursuant to the Requirements of Salem Unit 1 Technical Specification 3.3.3.7, Action 10, for the Unit 1 Main Steam Line Rad Monitor Inoperable for Greater than Seven Days ML23334A2502023-11-30030 November 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23299A2662023-11-29029 November 2023 Issuance of Amendment No. 238 Modified Implementation Date of License Amendment No. 237 ML23333A1362023-11-29029 November 2023 Supplement to Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation LR-N23-0077, Loss of Coolant Accident Peak Cladding Temperature Margin Tracking - Annual Report 2023 & 30 Day Report for Salem Unit 1 Upflow Conversion2023-11-29029 November 2023 Loss of Coolant Accident Peak Cladding Temperature Margin Tracking - Annual Report 2023 & 30 Day Report for Salem Unit 1 Upflow Conversion ML23270C0072023-11-29029 November 2023 Notice of Proposed Amendment to Decommissioning Trust Agreement ML23275A2072023-11-28028 November 2023 Issuance of Amendment No. 280 Removal of Technical Specification Condition Allowing Two Reactor Coolant Pump Operation ML23331A4972023-11-27027 November 2023 Supplement to License Amendment Request to Modify the 90-Day Implementation of License Amendment No. 237 ML23325A1412023-11-21021 November 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation IR 05000313/20230032023-11-21021 November 2023 Revised - ANO Revised Integrated Inspection Report 05000313/2023003 and 05000368/2023003 and Independent Spent Fuel Storage Installation Inspection Report 07200013/ 2023001 ML23325A2112023-11-20020 November 2023 Submittal of Request for Exemption from Specific Provisions in 10 CFR 73.55 ML23324A3072023-11-17017 November 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23320A2772023-11-16016 November 2023 License Amendment Request to Revise Ventilation Filter Testing Program Criteria in Technical Specification 5.5.11.b and Administrative Correction of Absorber in Technical Specification 5.5.11 ML23243B0452023-11-13013 November 2023 Request for Withholding Information from Public Disclosure ML23313A0962023-11-13013 November 2023 Integrated Inspection Report 05000313/2023003 and 05000368/2023003 and Independent Spent Fuel Storage Installation Inspection Report 07200013/2023001 IR 05000272/20230032023-11-13013 November 2023 Integrated Inspection Report 05000272/2023003 and 05000311/2023003 ML23311A2082023-11-0909 November 2023 Reassignment of U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch IV ML23305A3472023-11-0101 November 2023 Revision of One Form That Implements the Radiological Emergency Response Plan (RERP) 2024-02-05
[Table view] |
Text
s March 14, 2016 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
Subject:
Potential Part 21 on Siemens 401-158 Safety Clip Pursuant to the requirements of lOCFR Part 21, this letter notifies the NRC of a potential Part 21 condition.
The subject Safety Clip is used in medium voltage circuit breakers.
The subject circuit breakers are manufactured as a commercial grade item by Siemens Industry Inc. and dedicated for use as a basic component by National Technical Systems (NTS). Affected circuit breakers are 350 MVA Siemens Type 3AF. The Safety Clip in question is made of black finish steel and retains the Close Pawl Roller. During an inspection at Wolf Creek Nuclear Operating
- Company, the subject Safety Clips, were found cracked, broken, missing, or degraded after 600 to 850 operations.
If the Safety Clip breaks and falls off and the washers and roller pawl outside bearing and race fall off, then future circuit breaker close operations beyond the next close cycle may not be assured.
National Technical Systems has provided the 350 MVA Siemens Type 3AF circuit breakers to WCNOC Wolf Creek, PSEG Nuclear LLC Salem, and Entergy ANO. NTS will contact each utility and recommend that Safety Clip part number 401-158 be inspected and replaced with Safety Clip part number 40115. This Safety Clip is a yellow zinc plated clip of different design, and no known problems exist with this Safety Clip on different type Siemens circuit breakers dedicated by NTS. NTS will perform a failure analysis to determine the nature of the 401-158 clip failure.
NTS plans to complete this analysis by April 29, 2016. If you have any questions, please contact NTS' Senior Director of Nuclear Engineering and Test Services, Tom Brewington at (256) 716-4512 or email at tom.brewington@nts.com.
Sincerely,
.. ---*--------Megan Toomey Sr. Contracts Manager NTS Huntsville NTS Huntsville
- Huntsville, AL 35806 * (256) 837-4411
- www.nts.com s March 14, 2016 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
Subject:
Potential Part 21 on Siemens 401-158 Safety Clip Pursuant to the requirements of lOCFR Part 21, this letter notifies the NRC of a potential Part 21 condition.
The subject Safety Clip is used in medium voltage circuit breakers.
The subject circuit breakers are manufactured as a commercial grade item by Siemens Industry Inc. and dedicated for use as a basic component by National Technical Systems (NTS). Affected circuit breakers are 350 MVA Siemens Type 3AF. The Safety Clip in question is made of black finish steel and retains the Close Pawl Roller. During an inspection at Wolf Creek Nuclear Operating
- Company, the subject Safety Clips, were found cracked, broken, missing, or degraded after 600 to 850 operations.
If the Safety Clip breaks and falls off and the washers and roller pawl outside bearing and race fall off, then future circuit breaker close operations beyond the next close cycle may not be assured.
National Technical Systems has provided the 350 MVA Siemens Type 3AF circuit breakers to WCNOC Wolf Creek, PSEG Nuclear LLC Salem, and Entergy ANO. NTS will contact each utility and recommend that Safety Clip part number 401-158 be inspected and replaced with Safety Clip part number 40115. This Safety Clip is a yellow zinc plated clip of different design, and no known problems exist with this Safety Clip on different type Siemens circuit breakers dedicated by NTS. NTS will perform a failure analysis to determine the nature of the 401-158 clip failure.
NTS plans to complete this analysis by April 29, 2016. If you have any questions, please contact NTS' Senior Director of Nuclear Engineering and Test Services, Tom Brewington at (256) 716-4512 or email at tom.brewington@nts.com.
Sincerely,
.. ---*--------Megan Toomey Sr. Contracts Manager NTS Huntsville NTS Huntsville
- Huntsville, AL 35806 * (256) 837-4411