ML17101A366

Part 21 Notification - Failure of Vishay Diodes

ML17101A366
Person / Time
Site:	Millstone
Issue date:	04/06/2017
From:	Salsbury E Ametek Solidstate Controls
To:	Howard Crouch Office of Nuclear Reactor Regulation
References
52657
Download: ML17101A366 (6)

Text

0410612017 U.S. NuClear Regulatory Commission Operations Center Event Report *Part 21 (PAR) Event# Rep Org: AMETEK *Notification Date I Time: 04/03/2017 09:28 Supplier:

VISHAY/INTERNATIONAL Event Date I Time: 06/01/2016

-Last Modification:

04/06/2017 Region: 3 Docket#: City: COLUMBUS Agreement State: Yes County: License#:

State: *OH NRC Notified by: ETHAN SALSBURY Notifications:

MICHAEL KUNOWSKI HQ Ops Officer: HOWIE CROUCH CHRISTOPHER CAHILL Emergency Class: NON EMERGENCY, PART 21/50.55 REACTORS 10 CFRSection:

EUGENE GUTHRIE 21.21 (d)(3)(i)

DEFECTS AND NONCOMPLIANCE MICHAEL VASQUEZ / PART 21 NOTIFICATION

-FAILURE OF VISHAY DIODES The following information is the summary letter was received from Ametek via email: "Product:

Vishay/ International Rectifier Clamp, Diodes 600 V, 250A, forward and reverse bias. Ametek part numbers 07-600254-00 and 07-600255-00.:

Pagel 52657 (EDT) (EDT) R3DO R1DO EMAIL R2DO R4DO "Ametek Solidstate Controls is submitting the following Report of a Potential Defect in accordance with the requirements of 1 OCFR21. This notification is applicable to equipment model number 85-VC0250-29 provided to 'Dominion Nuclear at Millstone Power Station. Serial numbers affected by this potential defect are: C901880111 C901880211

C901880221

• C901880231 C901880244

,-"AMETEK SOLIDSTATE CONTROLS CORRECTIVE ACTION: If you wish to replace the diodes, Ametek Solidstate Controls will work.with you to arrange replacements.

Please contact Mr. Mark of our Client Services group at 1-800-222-9079 or 1-614-846-7500 ext. 6332. mark.shreve@ametek.com" "Please contact us at telephone:

614-846-7500; 1-800-635-7300 or e-mail: ethan.salsbury@ametek.com, if there . are any questions.

• ***UPDATE ON 4/6/17 AT 0839 EDT FROM ETHAN SALSBURY TO BETHANY CECERE***

0410612017 U.S. Nuclear Regulatory Commission Operations Center Event Report "The original notification for this report contained a typo on the last serial number of the equipment affected." Instead of serial number C901880244, the correct serial number is C901880241.

Notified R1 DO (Cahill), R2DO (Nease), R3DO (Skokowski), R4DO (Vasquez), and Part 21 Reactors group by email. Page2 ***********************************************************************************************************************************

Hoc, HOO X From: Sent: Ethan Salsbury <ethan.salsbury@ametek.com>

Thursday, April 06, 2017 8:39 AM To: Hoc, HOO X

Subject:

Attachments:

[External_Sender]

RE: Ametek Solidstate Controls Part 21-Reporting of Potential Defect Diode NRC Part 21 Notification r.2.pdf The original notification for this report contained a typo on the last serial number of the equipment affected.

I have attached the revised notification.

I apologize for any inconvenience.

Thanks, Ethan Salsbury Quality Manager AMETEK SOLIDSTATE CONTROLS 875

Dearborn Drive I Columbus,

OH 43085 I www.solidstatecontrolsinc.com D: +1614410 62931 C:+1419206 12831 ethan.salsburv@ametek.com.

Ii filj a From: Hoc, HOO X [1]

Sent: Monday, April 3, 2017 9:43 AM To: Ethan Salsbury <ethan.salsbury@ametek.com>

Subject:

RE: Ametek Solidstate Controls Part 21-Reporting of Potential Defect Received.

EN #52657 will be assigned to this report. Regards, Howie Crouch Headquarters Operations Officer U.S. Nuclear Regulatory Commission Phone: 301-816-5100 Fax: 301-816-5151 email: hoo.hoc@nrc.gov secure email: hool@nrc.sgov.gov From: Ethan Salsbury [2]

Sent: Monday, April 03, 2017 9:28 AM To: Hoc, HOO X <HOO.Hoc@nrc.gov>

Subject:

[External_Sender]

Ametek Solidstate Controls Part 21-Reporting of Potential Defect Good morning, Ametek Solidstate Controls is submitting the attached report as notification of a potential defect in compliance with 10CFR21. A copy will also be provided to the affected licensee, Dominion Millstone.

Please confirm receipt and feel free to contact me with any additional questions.

1 Regards, Ethan Salsbury Quality Manager .\Ml!IEK SOLIDSTATE CONTROLS 875

Dearborn Drive I Columbus,

OH 43085 I www.solidstatecontrolsinc.com D: +1614410 62931 C:+1419206 12831 ethan.salsburv@ametek.com Ii ffil a 2 A__l__l_J_J_'

SOLIDSTATE CONTROLS Quality Assurance 875

Dearborn Drive,

Columbus, OH 43085 U.S.A. Telephone:

614-846-7500; 1-800-635-7300 E-mail: ethan.salsbury@ametek.com April 3, 2017 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Attention:

Document Control Desk

Subject:

Notification of Potential Defect -1 OCFR Part 21 .\ IETE Product: Vishay/ International Rectifier Clamp, Diodes 600 V, 250A, forward and reverse bias. Ametek part numbers 07-600254-00 a.nd 07-600255-00.

Ametek Solidstate Controls is submitting the following Report of a Potential Defect in accordance with the requirements of 1 OCFR21. This notification is applicable to equipment model number 85-VC0250-29 provided to Dominion Nuclear at Millstone Power Station. Serial numbers affected by this potential defect are: C901880111 C901880211 C901880221 C901880231 C901880241 The attached document provides details on the potential problem, cause and effect, and actions required.

Please contact us at the phone number or email provided above if there are any questions.

Ethan Salsbury Quality Manager Ametek Solidstate Controls A_l_l_l_J_'

COMPONENT DESCRIPTION:

600 V, 250 A clamp diodes with Vishay/International Rectifier part numbers 300U60 and 300UR60 and Ametek part numbers 07-600254-00 and 07-600255-00, respectively.

Diodes were installed in 25kVA Inverter Ametek p/n 85-VC0250-29 with serial numbers C901880111, C901880211, C901880221, C901880231, and C901880241.

PROBLEM YOU COULD SEE: A diode failure appears to occur approximately 8-9*years in the operating life of the device. There are no conclusive warning signs that a failure is imminent, or detection method for predicting an approaching failure. Failures resulted in loss of output voltage, transfer of the static switch, blown fuses, .and unexpected alarms. CAUSE: The actual cause has not been determined.

Two diode failures occurred in two separate 85-VC0250-29 Inverters at Millstone Power Station. Diode failure analysis performed by Vishay in June of 2016 (1160153) suggested failure due to" electrical overstress and the remaining diode !?hawed signs of increased leakage current. Exelon Generation Failure Report DOM-72097 completed in September of 2016, indicated one diode was shorted and two others exhibited high leakage current. Neither evaluation identified a specific cause of the failure. The failed diodes were manufactured in India in 2006 and one in 2007. EFFECT ON SYSTEM PERFORMANCE:

Failures described above could result in loss of output voltage and transfer of the static switch to the bypass source which could result in potential loss of load. ACTION REQUIRED:

Ametek Solidstate Controls recommends that each facility evaluate the potential risk and performs replacement as determined necessary.

Recent evaluations have been unable to pinpoint a failure mode and history of these diodes provides no evidence of widespread failures.

Only two known failures have surfaced and the failure rate has been low. AMETEK SOLIDSTATE CONTROLS CORRECTIVE ACTION: If you wish to replace the diodes, Ametek Solidstate Controls will work with you to arrange replacements.

Please contact Mr. Mark Shreve of our Client Services group at 1-800-222-9079 or 1-614-846-7500 ext. 6332. mark.shreve@ametek.com