ENS 45173
ENS Event | |
|---|---|
02:46 Jun 7, 2009 | |
| Title | Invalid Containment Ventilation Isolation System Actuation |
| Event Description | This telephone notification is provided in accordance with 10CFR50.73(a)(1), to report an invalid actuation reportable per 10CFR50.73(a)(2)(iv)(A), 'Any event or condition that resulted in manual or automatic actuation of any system in paragraph (a)(2)(iv)(B) ' General containment isolation signals affecting containment isolation valves in more than one system is identified in paragraph (a)(2)(iv)(B). Although the Containment Ventilation Isolation signal affects multiple containment isolation valves in several systems, at the time of the invalid actuation, only containment isolation valves associated with the containment area radiation monitor were open. Therefore, this notification is being conservatively made. NUREG 1022 Revision 2 identifies the information that needs to be reported as discussed below.
(A) The specific train(s) and system(s) that were actuated. On June 6, 2009 at 2246 hours0.026 days <br />0.624 hours <br />0.00371 weeks <br />8.54603e-4 months <br />, with Unit 1 in Mode 1, a containment area radiation monitor failed high, resulting in an invalid A and B train automatic Containment Ventilation Isolation (CVI). Four containment isolation valves, associated with a containment radiation air monitor, that was in-service at the time of the actuation, closed. Additionally, valves (non-containment isolation valves) in the Auxiliary building closed in response to the actuation. (B) Whether each train actuation was complete or partial. The actuation was considered complete. The CVI signal automatically isolated all valves that were open at the time of the actuation. (c) Whether or not the system started and functioned successfully. The Containment Ventilation Isolation signal automatically actuated and functioned successfully. The CVI signal was not in response to actual plant conditions and is therefore considered invalid. In reviewing this CVI actuation it was also discovered that on July 6, 2007 a similar CVI had occurred on Unit 1 when a circuit board associated with the containment vent radiation monitor failed. The failure resulted in an actuation of CVI train A and Train B. The actuation was considered complete since all valves that were open at the time of the actuation isolated as required. The CVI was not in response to actual plant conditions and was therefore considered invalid. The licensee will notify the NRC Resident Inspector. |
| Where | |
|---|---|
Vogtle  Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+545.98 h22.749 days <br />3.25 weeks <br />0.748 months <br />) | |
| Opened: | Al Sweat 20:45 Jun 29, 2009 |
| NRC Officer: | Vince Klco |
| Last Updated: | Jun 29, 2009 |
| 45173 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 567792023-08-07T18:39:0007 August 2023 18:39:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-DAY Optional Telephonic Notification for an Invalid Specified System Actuation ENS 453922009-09-20T22:00:00020 September 2009 22:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation from a Surveillance Activity Test Signal ENS 451732009-06-07T02:46:0007 June 2009 02:46:00 10 CFR 50.73(a)(1), Submit an LER Invalid Containment Ventilation Isolation System Actuation 2023-08-07T18:39:00 | |