ENS 53548: Difference between revisions
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| NRC officer = Richard Smith | | NRC officer = Richard Smith | ||
| event date = 08/12/2018 00:00 EDT | | event date = 08/12/2018 00:00 EDT | ||
| last update date = 08/ | | last update date = 08/16/2018 | ||
| title = | | title = En Revision Imported Date 8/17/2018 | ||
| event text = On 8-12-18 at 0158 EDT, Beaver Valley Unit 2 experienced a loss of 480 Volt 2P Emergency Bus. This resulted in a Loss of Safety Function due to the 2-2 Emergency Diesel Generator [EDG] being Inoperable coincident with the Residual Heat Release Valve (2SVS-HCV104). A Technical Specification shutdown is required per LCO 3.0.3. | | event text = EN Revision Text: TECHNICAL SPECIFICATION REQUIRED SHUTDOWN - LOSS OF 480 VOLTAGE EMERGENCY BUS | ||
On 8-12-18 at 0158 EDT, Beaver Valley Unit 2 experienced a loss of 480 Volt 2P Emergency Bus. This resulted in a Loss of Safety Function due to the 2-2 Emergency Diesel Generator [EDG] being Inoperable coincident with the Residual Heat Release Valve (2SVS-HCV104). A Technical Specification shutdown is required per LCO 3.0.3. | |||
The Licensee also stated they were in an unanalyzed condition due to the EDG and Residual Heat Release Valve being inoperable at the same time. | The Licensee also stated they were in an unanalyzed condition due to the EDG and Residual Heat Release Valve being inoperable at the same time. | ||
The Licensee is shutting down to Mode 5 (Cold Shutdown). | The Licensee is shutting down to Mode 5 (Cold Shutdown). | ||
The Licensee is notifying the Resident Inspector. | The Licensee is notifying the Resident Inspector. | ||
The Licensee will be making a Press Release about the unplanned shutdown. | The Licensee will be making a Press Release about the unplanned shutdown. | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/ | * * * UPDATE ON 08/16/2018 AT 1424 EDT FROM BLASE BARTKO TO KEN MOTT * * * | ||
On 8-12-18 at 0158 [EDT] Beaver Valley Unit 2 experienced a loss of 480 Volt 2P Emergency Bus. Per operational guidance, this was determined to be a Loss of Safety Function due to the Unit 2 Emergency Diesel Generator (EDG) being INOPERABLE coincident with the Residual Heat Release Valve (2SVS-HCV104) 10 CFR 50.72(b)(3)(v)(B) and (D). This was also reported as an Unanalyzed Condition 10 CFR 50.72(b)(3)(ii)(b). | |||
No Press Release was performed for this event. | |||
The NRC Resident Inspector was notified. | |||
At 0410 [EDT] a Technical Specification Shutdown was commenced 10 CFR 50.72(b)(2)(i). | |||
At 2011 [EDT] the 480 Volt 2P Emergency Bus was restored and energized. | |||
Further evaluation of the event has determined that this event was not an Unanalyzed Condition and did not result in a Loss of Safety Function. The classifications of Unanalyzed Condition and Loss of Safety Function are being retracted. | |||
The accuracy of the existing guidance relative to Safety Function has been entered in the Corrective Action Program and interim actions have been taken to provide accurate guidance. | |||
Notified R1DO (Young) via email. | |||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180817en.html#en53548 | |||
}}{{unit info | }}{{unit info | ||
| Unit = 2 | | Unit = 2 | ||
Revision as of 07:30, 17 August 2018
| Where | |
|---|---|
| Beaver Valley Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-1.03 h-0.0429 days <br />-0.00613 weeks <br />-0.00141 months <br />) | |
| Opened: | Rob Klindworth 02:58 Aug 12, 2018 |
| NRC Officer: | Richard Smith |
| Last Updated: | Aug 16, 2018 |
| 53548 - NRC Website
| |