ENS 48569
ENS Event | |
|---|---|
06:00 Nov 9, 2012 | |
| Title | Part 21 - Brackets Used Proximity Switches Installed Upside Down |
| Event Description | Equipment Affected By This Fisher Information Notice:
This Fisher Information Notice (FIN) applies to equipment provided to Arizona Public Service Company-Palo Verde Nuclear Generating Station per Fisher Order Number 019-F10051845, Items 0001, 0002, 0004, and 0005 (Arizona Public Service PO# 500559374). The affected equipment Is: 4 [inch] CL900 Fisher HPD valve assemblies with TopWorx C8-24521-E3 proximity switches. The equipment is identified by Fisher serial numbers 20417605, 20428975, 20428977, and 20428978 respectively and Arizona Public Service Company tag numbers 1JSGEUV0169, 2JSGEUV0169, 1JSGEUV0183, and 2JSGEUV0183. Purpose: The purpose of this FIN is to alert Arizona Public Service Company that as of 9 November, 2012, Fisher Controls International LLC (Fisher) became aware of a situation which may potentially affect the safety-related performance of the aforementioned equipment. Fisher is informing you of this circumstance in accordance with Section 21.21 (b) of 10 CFR 21. Applicability: This FIN applies only to the aforementioned equipment supplied by Fisher to Arizona Public Service Company- Palo Verde Nuclear Generating Station. Discussion: Arizona Public Service Company has determined that the brackets used to install the TopWorx switches were installed improperly by Fisher. Specifically, the mounting brackets for the switches were installed upside down. This orientation makes it impossible for the switches to operate properly and to perform their safety-related function. While the design used for these brackets was unique and constituted a first-time installation by Fisher, Fisher is in the process of performing a root cause analysis as well as investigating why the error was not detected prior to shipment. Fisher will implement a corrective action to prevent problems like this from reoccurring in the future. Additionally specific arrangements are being made with Arizona Public Service Company to correct the problem on the subject serial numbers, at Fisher's cost. Action Required: Fisher is currently working with Arizona Public Service Company to resolve the situation, including, the implementation of a bracket redesign and testing program to demonstrate the problem has been satisfactorily corrected. 10 CFR 21 Implications: Fisher requests that the recipient of this notice review it and take appropriate action in accordance with 10 CFR 21. If there are any technical questions or concerns, please contact: George Baitinger; Manager, Quality; Fisher Controls International LLC; 205 South Center Street Marshalltown, IA 50158; Fax: (641) 754-2854, Phone: (641) 745-2026.
The following information was received via fax: After the switches were properly reinstalled it was discovered that due to potential rotation of the valve stem connector when operating the hand wheel, the target magnets could, in some cases, rotate beyond the gap required for switch functionality. This additional discovery is the reason for the issue of this supplemental FIN. Fisher is currently working with TopWorx and APS/PVNGS [Arizona Public Service / Palo Verde Nuclear Generating Station] to develop a bracket redesign with adequate guiding which will constrain the magnet/switch gap to within acceptable criteria. Notified the R4DO (Haire), R3DO (Duncan) and Part 21 Group (via e-mail). |
| Where | |
|---|---|
| Fisher Division Marshalltown, Iowa (NRC Region 3) | |
| Organization: | Emerson Process Management |
| Reporting | |
| 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
| Time - Person (Reporting Time:+675.88 h28.162 days <br />4.023 weeks <br />0.926 months <br />) | |
| Opened: | Trish Crosser 09:53 Dec 7, 2012 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Apr 30, 2013 |
| 48569 - NRC Website | |
Fisher Division with 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
WEEKMONTHYEARENS 485692012-11-09T06:00:0009 November 2012 06:00:00
[Table view]10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 - Brackets Used Proximity Switches Installed Upside Down 2012-11-09T06:00:00 | |