ML16342A978: Difference between revisions
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To: NRC 0 erations Center From: Ra Chalifoux, ATC Nuclear Fax: (301) 816-5151 Pa es: 5 Date: 12/1/2016 Re: | To: NRC 0 erations Center From: Ra Chalifoux, ATC Nuclear Fax: (301) 816-5151 Pa es: 5 Date: 12/1/2016 Re: 10CFR Part 21 Written Notification of Potential Defect ATC Nuclear Assembly with a W-2 Electroswitch Switch, Part Number W2-45B640-84 and W2-45B640-85. | ||
A Division of Argo Turboserve Corporation 777 Emory Valley Rd | A Division of Argo Turboserve Corporation 777 Emory Valley Rd | ||
* Oak Ridge, TN 37830 | * Oak Ridge, TN 37830 | ||
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==Subject:== | ==Subject:== | ||
10CFR Part 21 Written Notification of Potential Defect ATC Nuclear Assembly with a W-2 Electroswitch Switch, Part Number W2-45B640-84 and W2-45B640-85. | |||
Pursuant to | Pursuant to 10CFR 21.21 (d)(3)(ii), ATC Nuclear is providing the required written notification of a potential defect on the ATC Nuclear Assembly with a W-2 Electroswitch Switch, Part Number W2-45B640-84 and W2-45B640-85. This notification was initially reported to the NRC Operations Center on December 1, 2016. The enclosure to this letter provides the information required by 10CFR 21.21(d)(4). | ||
If you have any questions or need additional information regarding this matter, please contact Ray Chalifoux at (865) 384-0124. | If you have any questions or need additional information regarding this matter, please contact Ray Chalifoux at (865) 384-0124. | ||
Sincerely, | Sincerely, | ||
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* www.argoturbo.com | * www.argoturbo.com | ||
Enclosure IOCFR21 Report Page 1 of3 WRITTEN REPORT PER | Enclosure IOCFR21 Report Page 1 of3 WRITTEN REPORT PER 10CFR 21.2l(d)(4): | ||
(i) Name and address of the individual or individuals informing the Commission. | (i) Name and address of the individual or individuals informing the Commission. | ||
Ray Chalifoux ATC Nuclear 777 Emory Valley Road, Oak Ridge, 1N 37830. | Ray Chalifoux ATC Nuclear 777 Emory Valley Road, Oak Ridge, 1N 37830. | ||
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Enclosure. | Enclosure. | ||
10CFR2 l Report Page 2 of3 suitability and fit-up. Calculations were produced that showed the actual force present on the latching tabs of the pawl fasteners when the assembly is subject to seismic testing. From the calculation results, ATC Nuclear Engineering staff determined that the force being transmitted to the latching tab within the pawl fasteners during a simulated seismic event was in excess of the published data from the manufacturer. | |||
Based on the testing and analysis described above, ATC Nuclear concluded that the minimum force required to maintain structural integrity cannot be achieved with the existing pawl fasteners installed in the ATC Nuclear assembly. This condition, ifleft uncorrected, could potentially cause a failure of the switch assembly to maintain its mounting configuration during a seismic event. This information provides the basis to establish a deviation in the pawl fasteners provided with the ATC Nuclear assembly that could be considered a potential defect as defined in 10 CFR Part 21. It is worth noting that there have been no failures identified by customers associated with this potential defect. | Based on the testing and analysis described above, ATC Nuclear concluded that the minimum force required to maintain structural integrity cannot be achieved with the existing pawl fasteners installed in the ATC Nuclear assembly. This condition, ifleft uncorrected, could potentially cause a failure of the switch assembly to maintain its mounting configuration during a seismic event. This information provides the basis to establish a deviation in the pawl fasteners provided with the ATC Nuclear assembly that could be considered a potential defect as defined in 10 CFR Part 21. It is worth noting that there have been no failures identified by customers associated with this potential defect. | ||
The analyses and evaluations performed by ATC Nuclear do not consider purchasers and/or licensee application-specific information as it only focuses on the functional performance of ATC Nuclear assembly when subjected to a simulated seismic event. On this basis, ATC Nuclear does not have the capability to complete the 10 CFR Part 21 evaluation to determine whether this potential defect could cause a substantial safety hazard, so we are informing the purchasers and/or affected licensees of this determination so that the purchasers and/or affected licensees may evaluate the identified potential defect pursuant to §10 CFR 21.2l(a). | The analyses and evaluations performed by ATC Nuclear do not consider purchasers and/or licensee application-specific information as it only focuses on the functional performance of ATC Nuclear assembly when subjected to a simulated seismic event. On this basis, ATC Nuclear does not have the capability to complete the 10 CFR Part 21 evaluation to determine whether this potential defect could cause a substantial safety hazard, so we are informing the purchasers and/or affected licensees of this determination so that the purchasers and/or affected licensees may evaluate the identified potential defect pursuant to §10 CFR 21.2l(a). | ||
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* www.argoturbo.com | * www.argoturbo.com | ||
Enclosure | Enclosure 10CFR2 l Report Page 3 of3 TVA PO Line ATC Item ID Part Number Qty UNID Number of Number Item Nuclear Supplied Contacts Number Job per Train Number 39541 6 PA4225 CPV151K W2-45B640-84 1 2-HS-l-22A 4 39541 7 PA4225 CPV153K W2-458640-85 1 2-(RT-1) 4 61610 11 PA4297 CPV153K W2-45B640-85 1 2-(RT-1)* 4 (vii) The corrective action which has been, is being, or will be taken; the name of the individual or organization responsible for the action; and the length of time that has been or will be taken to complete the action. | ||
ATC Nuclear has successfully qualified an upgraded pawl fastener for use in these switch assemblies, as documented in CAR l ST-46. In addition, A TC Nuclear Engineering is providing three (3) options for correcting the above listed deviation with regard to switches in the field. | ATC Nuclear has successfully qualified an upgraded pawl fastener for use in these switch assemblies, as documented in CAR l ST-46. In addition, A TC Nuclear Engineering is providing three (3) options for correcting the above listed deviation with regard to switches in the field. | ||
o Option 1: The customer can at their earliest convenience send the affected switch assemblies to ATC Nuclear's Oak Ridge, TN location for refurbishment with the upgraded pawl fasteners. ATC Nuclear will dismantle the affected switch assemblies to the point that the defective pawl fasteners can be removed, the new upgraded pawl fasteners can be installed, the switch assembly reassembled, and switch function verified prior to shipment back to the customer. | o Option 1: The customer can at their earliest convenience send the affected switch assemblies to ATC Nuclear's Oak Ridge, TN location for refurbishment with the upgraded pawl fasteners. ATC Nuclear will dismantle the affected switch assemblies to the point that the defective pawl fasteners can be removed, the new upgraded pawl fasteners can be installed, the switch assembly reassembled, and switch function verified prior to shipment back to the customer. |
Revision as of 15:27, 10 November 2019
ML16342A978 | |
Person / Time | |
---|---|
Site: | Watts Bar ![]() |
Issue date: | 12/02/2016 |
From: | Chalifoux R ATC Nuclear |
To: | Document Control Desk, Office of Nuclear Reactor Regulation |
References | |
52403 | |
Download: ML16342A978 (6) | |
Text
1210212016 U.S. Nuclear Regulatory Commission Oper_at_io_n_s_C_e_nt_e_rE_ve_n_tR---"ep_o_rt_ _ _ _ _ _--.R.-.ag....e....1.._
Part 21 (PAR) Event# 52403 Rep Org: ATC NUCLEAR Notification Date/Time: 12/01/2016 13:18 (EST)
Supplier: ATC NUCLEAR Event Date I Time: 12/08/2015 (EST}
Last Modification: 12/01/2016 Region: 1 Docket#:
City: OAK RIDGE Agreement State: Yes County: License #:
State: TN NRC Notified by: RAY CHALIFOUX Notifications: GERALD MCCOY R2DO HQ Ops Officer: JEFF HERRERA PART 21/50.55 REACTORS .EMAIL Emergency Class: NON EMERGENCY 10 CFR Section:
21.21 (d)(3)(i) DEFECTS AND NONCOMPLIANCE PART 21 - PAWL FASTENERS FAILED TO PROVIDE SUFFICIENT STRUCTURAL SUPPORT The following is an excerpt of a Part 21 received via email:
"On December 8, 2015, ATC Nuclear performed seismic qualification testing on an ATC Nuclear Assembly with a W-2 Electroswitch Switch, Part Number W2-45B640-84 and W2-45B640-85, for TVA Watts Bar 2. During the first Safe Shutdown Earthquake (SSE) test run, the pawl fasteners used to secure the assembly in a test fixture failed to provide sufficient structural support, rendering the switch assembly non-captive.
"Based on the testing and analysis, ATC Nuclear concluded that the minimum force required to maintain structural integrity cannot be achieved with the existing pawl fasteners installed in the ATC Nuclear Assembly. This condition, if left uncorrected, could potentially cause a failure of the switch assembly to maintain its mounting configuration during a seismic event. This information provides the basis to establish a deviation in the pawl fasteners provided with.the ATC Nuclear assembly that could be considered a potential defect as defined in 10 CFR Part 21. It is worth noting that there have been no failures identified by customers associated with this potential defect.
"If you have any questions or need additional information regarding this matter, please contact Ray Chalifoux at (865) 384-0124."