ENS 53287: Difference between revisions
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| emergency class = Non Emergency | | emergency class = Non Emergency | ||
| notification date = 03/25/2018 23:43 | | notification date = 03/25/2018 23:43 | ||
| retracted = Yes | |||
| notification by = Joseph Frattasio | | notification by = Joseph Frattasio | ||
| NRC officer = Vince Klco | | NRC officer = Vince Klco | ||
| event date = 03/25/2018 16:16 EDT | | event date = 03/25/2018 16:16 EDT | ||
| last update date = | | last update date = 04/13/2018 | ||
| title = Control Rod Drive Piping Potentially Inoperable | | title = Control Rod Drive Piping Potentially Inoperable | ||
| event text = On March 25, 2018 at 1616 hours [EDT], with the reactor in cold shutdown condition, two control rod drive piping lines were determined to be potentially inoperable in the event of a design basis earthquake due to support defects. The control rod drive piping forms a portion of the reactor coolant pressure boundary and primary containment boundary. | | event text = On March 25, 2018 at 1616 hours [EDT], with the reactor in cold shutdown condition, two control rod drive piping lines were determined to be potentially inoperable in the event of a design basis earthquake due to support defects. The control rod drive piping forms a portion of the reactor coolant pressure boundary and primary containment boundary. | ||
| Line 22: | Line 23: | ||
The NRC Resident Inspector has been notified. | The NRC Resident Inspector has been notified. | ||
The licensee will notify the Commonwealth of Massachusetts. | The licensee will notify the Commonwealth of Massachusetts. | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/ | * * * RETRACTION FROM JOE FRATTASIO TO HOWIE CROUCH AT 1500 EDT ON 4/13/18 * * * | ||
The purpose of the notification is to retract ENS notification 53287 made on 03/25/18 for Pilgrim Nuclear Power Station. The previous notification reported that control rod drive (CRD) piping could be potentially inoperable in the event of a design basis earthquake, at the time of discovery, due to piping support defects. Subsequent evaluation has demonstrated that the piping was not inoperable. | |||
Specifically, after an engineering evaluation, it has been determined that the CRD Hydraulic System operability was never lost and the system was operable, although non-conforming, based on the support configuration not conforming to the pipe support drawings. The affected pipe supports have been restored or reworked to the proper design condition in accordance with the design drawings. The CRD System has subsequently been restored to a fully operable status. | |||
Notified R1DO (Jackson) and IRD MOC (Pham). | |||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180416en.html#en53287 | |||
}}{{unit info | }}{{unit info | ||
| Unit = 1 | | Unit = 1 | ||
Latest revision as of 07:01, 16 April 2018
| Where | |
|---|---|
| Pilgrim Massachusetts (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+3.45 h0.144 days <br />0.0205 weeks <br />0.00473 months <br />) | |
| Opened: | Joseph Frattasio 23:43 Mar 25, 2018 |
| NRC Officer: | Vince Klco |
| Last Updated: | Apr 13, 2018 |
| 53287 - NRC Website
| |