ENS 48995
From kanterella
Jump to navigation
Jump to search
ENS Event | |
---|---|
05:11 May 3, 2013 | |
Title | Temporary Loss of Both Trains of Emergency Gas Treatment System |
Event Description | On May 3, 2013, at 0111 [EDT], Technical Specification Limiting Condition of Operation (TS LCO) 3.0.3 was entered due to the loss of both trains of Emergency Gas Treatment System (EGTS). The Train B EGTS had been removed from service for scheduled maintenance and at 0111 the Train A auxiliary air dryer stopped functioning. On May 3, 2013, at 0155, Train B EGTS was restored to service and declared Operable, and TS LCO 3.0.3 was exited.
The auxiliary air system is required to support multiple safety related systems. The auxiliary air system is the safety grade air supply for EGTS. As Train A auxiliary air was no longer Operable, and the B train EGTS system was inoperable, the safety function supported by EGTS was not available. The EGTS establishes a negative pressure in the annulus between the shield building and the steel containment vessel. Filters in the system then control the release of radioactive contaminants to the environment. Watts Bar Unit 1 remained in Mode 1 at 100% power. No reactivity was added to the plant. This event is reportable under 10 CFR 50.72(b)(3)(v)(C) and (D) as a condition that could have prevented the fulfillment of a safety function. The NRC Resident Inspector has been notified. |
Where | |
---|---|
Watts Bar Tennessee (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+2.72 h0.113 days <br />0.0162 weeks <br />0.00373 months <br />) | |
Opened: | Brian Mcilnay 07:54 May 3, 2013 |
NRC Officer: | Charles Teal |
Last Updated: | May 3, 2013 |
48995 - NRC Website | |
Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Retrieved from "https://kanterella.com/w/index.php?title=ENS_48995&oldid=423132"