ENS 55522: Difference between revisions
Jump to navigation
Jump to search
StriderTol (talk | contribs) (StriderTol Bot change) |
StriderTol (talk | contribs) (StriderTol Bot change) |
||
| Line 12: | Line 12: | ||
| emergency class = Non Emergency | | emergency class = Non Emergency | ||
| notification date = 10/14/2021 19:27 | | notification date = 10/14/2021 19:27 | ||
| retracted = Yes | |||
| notification by = Nikolas Schafer | | notification by = Nikolas Schafer | ||
| NRC officer = Bethany Cecere | | NRC officer = Bethany Cecere | ||
| event date = 10/14/2021 13:20 EDT | | event date = 10/14/2021 13:20 EDT | ||
| last update date = | | last update date = 11/24/2021 | ||
| title = Traversing IN-CORE Probe a Ball Valve Inoperable | | title = Traversing IN-CORE Probe a Ball Valve Inoperable | ||
| event text = At 1320 EDT, during a Traversing In-Core Probe (TIP) run for a scheduled Local Power Range Monitors (LPRM) calibration, it was reported to the Main Control Room that TIP A would not fully retract to the In-Shield position. With TIP A unable to fully retract to the In-Shield position the TIP A Ball Valve was declared Inoperable due to not being able to close and meet its safety function in that configuration. | | event text = At 1320 EDT, during a Traversing In-Core Probe (TIP) run for a scheduled Local Power Range Monitors (LPRM) calibration, it was reported to the Main Control Room that TIP A would not fully retract to the In-Shield position. With TIP A unable to fully retract to the In-Shield position the TIP A Ball Valve was declared Inoperable due to not being able to close and meet its safety function in that configuration. | ||
| Line 22: | Line 23: | ||
This report is being made pursuant to 10CFR50.72(b)(3)(v)(C) based on control the release of radioactive material. | This report is being made pursuant to 10CFR50.72(b)(3)(v)(C) based on control the release of radioactive material. | ||
The Senior NRC Resident Inspector has been notified. | The Senior NRC Resident Inspector has been notified. | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/ | * * * RETRACTION ON NOVEMBER 24, 2021 AT 1232 EST FROM LEVI SMITH TO BRIAN P. SMITH * * * | ||
The purpose of this notification is to retract a previous report made on October 14, 2021 (EN 55522). At 1320 EDT on October 14, 2021 while performing Traversing In-Core Probe (TIP) Machine Gain Adjustment in support of Local Power Range Monitor (LPRM) calibration, an unplanned inoperability of the TIP 'A' Primary Containment Isolation Valve (PCIV) was reported pursuant to 10CFR50.72(b)(3)(v)(C) by EN 55522. On October 14, it was reported to the Main Control Room that TIP 'A' would not fully retract to the In-Shield position. With TIP 'A' unable to fully retract to the In-Shield position, the TIP 'A' Ball Valve PCIV was declared Inoperable due to not being able to close and meet its safety function in that configuration. The TIP 'A' Shear Valve PCIV was previously declared inoperable due to firing fuses being removed. | |||
Further investigation determined that a "FAULT: MOVEMENT LIMITED" error was received. This TIP error condition did not present a primary containment isolation issue in the event of a primary containment isolation signal. The Automatic TIP Control Unit (ATCU) is designed to command the TIP drive mechanism to continuously retract a TIP probe to the in-shield position in the event of a containment isolation signal with this condition. In the event of a containment isolation signal, the TIP machine would withdraw the TIP detector back to the in-shield position and the TIP A ball valve PCIV would have closed to perform its safety function. Therefore, the inoperability of TIP 'A' ball valve reported under criterion 10CFR50.72(b)(3)(v)(C) was not met, and EN 55522 is hereby retracted. | |||
The NRC Resident Inspector has been notified. | |||
Notified R3DO (Peterson) | |||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20211126en.html#en55522 | |||
}}{{unit info | }}{{unit info | ||
| Unit = 2 | | Unit = 2 | ||
Latest revision as of 07:30, 26 November 2021
| Where | |
|---|---|
Fermi  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+2.12 h0.0883 days <br />0.0126 weeks <br />0.0029 months <br />) | |
| Opened: | Nikolas Schafer 19:27 Oct 14, 2021 |
| NRC Officer: | Bethany Cecere |
| Last Updated: | Nov 24, 2021 |
| 55522 - NRC Website
| |