ENS 52537
ENS Event | |
|---|---|
06:00 Jan 2, 2017 | |
| Title | Part 21 - Valve Assembly Nonconformance |
| Event Description | Subject: 3" Style HPNS Valve Body/Cage/Plug Retainer Binding
Equipment Affected by this Fisher Information Notice: Items subject to this Fisher Information Notice (FIN) are confined to the equipment and orders referred to in Appendix A attached. Specifically, affected equipment refers to the 3" style HPNS valve body for next-generation nuclear plants and its associated cage and plug retainer. Purpose: The purpose of this FIN is to alert affected customers that, as of 2 January 2017, Fisher Controls International LLC (Fisher) became aware of a situation which may affect the performance of the aforementioned equipment, including its safety-related function. Fisher is informing affected customers of this circumstance in accordance with Section 21.21(b) of 10 CFR 21. Applicability: This FIN applies only to the equipment identified in Appendix A, which lists serial numbers and order numbers that were delivered to customers. Specifically, it applies to the Fisher 3 style HPNS valve body assembly, sold to AP1000 next generation plant sites, Commodity Package PV14, Datasheet 111. Discussion: During plant hot functional testing, certain valve assemblies did not achieve full travel. Upon disassembly, site inspection found wear between the cage and plug retainer in some valves. Vertical scratches in the cage internal diameter and plug retainer outside diameter was confirmation of galling which prohibited full travel. In one valve, the cage could not be removed from the body as it was friction-welded due to galling. The valve body-to-cage interference is attributed to body-to-bonnet gasket compression which caused the valve body gasket groove to distort/yield, particularly the cage guide internal diameter bore. Regarding the cage-to-plug retainer binding, thermal expansion calculations between cage internal diameter and plug retainer outside diameter indicate an undersized diametrical clearance at temperature. Extent of Condition: In addition to the equipment listed in Appendix A, all other style HPNS designs (NPS 1/2, 1, 2, 3, 4, 6, and 8) were examined for extent of condition. Results indicate that DS111 was a lone outlier and this issue is not expected to occur for the other sizes, material combinations and datasheets sold into their respective applications and temperatures. Arrangements have been made with the customers to replace or maintenance the trim for the equipment listed in Appendix A. In addition, a Corrective Action Request (CAR 1817) has been initiated by Fisher to prevent reoccurrence of this issue. 10 CFR 21 Implications: Fisher requests that the recipient of this FIN review it and take appropriate action in accordance with 10 CFR 21. If there are any technical questions or concerns, please contact: Ben Ahrens, Quality Manager, Emerson Automation Solutions, Fisher Controls International LLC, 301 South First Avenue, Marshalltown, IA 50158, Phone: (641) 754-2249, F (641) 754-2830. |
| Where | |
|---|---|
| Fisher Controls International Llc Marshalltown, Iowa (NRC Region 3) | |
| Organization: | Emerson Process Management |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect 10 CFR 50.55(e) | |
| Time - Person (Reporting Time:+893.28 h37.22 days <br />5.317 weeks <br />1.224 months <br />) | |
| Opened: | Kim Sagar 11:17 Feb 8, 2017 |
| NRC Officer: | Dong Park |
| Last Updated: | Feb 8, 2017 |
| 52537 - NRC Website | |
Fisher Controls International Llc with 10 CFR 50.55(e), 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 525372017-01-02T06:00:0002 January 2017 06:00:00
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