ENS Event | |
|---|---|
07:00 Mar 19, 2020 | |
| Title | Part 21 Notification - Transducer Defect |
| Event Description | The following is a summary of information obtained from Palo Verde via email:
During pre-installation testing, five Masoneilan Model transducers were identified as unable to be calibrated prior to installation. These transducers were received by the vendor as safety-related components and are used to provide remote control operation of the Atmospheric Dump Valves (ADVs). The ADVs provide a safety grade method for cooling the unit to Shutdown Cooling System entry conditions, should Palo Verde's preferred heat sink via the Steam Bypass Control System to the condenser and/or atmosphere not be available. The transducer receives a 4-20 mA signal and translates it to a 3-15 psi output to the ADV positioner. This is accomplished by varying the supply air from 23-30 psi down to the appropriate 3-15 psi signal. Palo Verde provided an Interim 10 CFR 21 Report for the five Masoneilan Model 8005N transducers, Part 21 log number 2019-36-00, ML 19323C971, which was submitted by Arizona Public Service (APS) Company on November 15, 2019. An evaluation of the transducers was completed on March 19, 2020. The evaluation concluded that the inability of the transducers to be calibrated represented a defect. The licensees affected are undetermined at this time. Palo Verde has been in communication with the vendor. The vendor has currently not provided an extent of condition. Point of Contact: Lorraine Weaver (602) 448-5915 |
| Where | |
|---|---|
Palo Verde  Arizona (NRC Region 4) | |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+200.3 h8.346 days <br />1.192 weeks <br />0.274 months <br />) | |
| Opened: | Lorraine Weaver 15:18 Mar 27, 2020 |
| NRC Officer: | Brian P. Smith |
| Last Updated: | Mar 27, 2020 |
| 54621 - NRC Website
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WEEKMONTHYEARENS 546212020-03-19T07:00:00019 March 2020 07:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Notification - Transducer Defect ENS 543092019-03-03T07:00:0003 March 2019 07:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Ge Hitachi Primary Contact Finger Surface Defect ENS 526702017-04-05T07:00:0005 April 2017 07:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Circuit Breaker Defect Discovered During Current Injection Testing 2020-03-19T07:00:00 | |