ENS Event | |
|---|---|
22:00 Sep 20, 2009 | |
| Title | Invalid Actuation from a Surveillance Activity Test Signal |
| Event Description | On Sunday September 20, 2009 @ 1800 hrs EDT the Vogtle Electric Generating Plant Unit 1 was in Mode 5 and performing testing for Containment Ventilation Isolation. A jumper was installed per operations procedure 14238-1 for this testing. The jumper was inadvertently dislodged resulting in a B Train Containment Ventilation Isolation (CVI). There was not a valid radiation alarm signal present; only a test signal. Per Technical Specification 3.3.8 this function is applicable in MODES 1, 2, 3 and 4. The actuation occurred during a maintenance activity and was not from a valid signal.
This is reportable under 50.73 (a)(2)(iv) based on the following: Per 50.73(a)(2)(iv)(A), 'Any event or condition that resulted in manual or automatic actuation of any of the systems listed in paragraph (a)(2)(iv)(B) of this section, except when: (1) The actuation resulted from and was part of a pre-planned sequence during testing or reactor operation; or (2) The actuation was invalid and: (i) Occurred while the system was properly removed from service; or (ii) Occurred after the safety function had been already completed.' The event occurred during a surveillance activity and resulted in an invalid actuation from a test signal. The actuation was invalid and the system was not removed from service during this activity. The actuation was considered complete and successful. The CVI signal for Train B automatically isolated the containment ventilation system as designed. The licensee notified 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:+222.5 h9.271 days <br />1.324 weeks <br />0.305 months <br />) | |
| Opened: | Jeff Todd 04:30 Sep 30, 2009 |
| NRC Officer: | Vince Klco |
| Last Updated: | Sep 30, 2009 |
| 45392 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
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 | |