ENS Event | |
|---|---|
13:30 Apr 10, 2009 | |
| Title | Violation of Limiting Conditions in Technical Specification 3.5B |
| Event Description | On Monday, 13 Apr 2009 at approximately 9 AM, the stack sample pump was observed to be off. On Friday, 10 Apr 2009, the reactor operated from approximately 11 AM to 4 PM.
Upon investigating this situation it was learned that at approximately 9:30 AM on 10 Apr 2009 the stack sample pump apparently lost power. The stack pump remained off until being re-started on 13 Apr 2009. Technical Specification (TS) 3.5b requires the stack particulate and stack gas radiation monitoring channels to be operable during reactor operation. With the stack sample pump off, neither of these two channels were operable during reactor operation on 10 Apr 2009. The Auxiliary GM may serve as a substitute for one of the two required channels. As a result, the reactor was operated on 10 Apr 2009 in violation of TS 3.5b. This event is a reportable event as defined in TS (1.2.24d and 6.6.2) under TS 6.7.1 since both channels were not operable as required by the Limiting Conditions for Operation TS 3.5b. The US Nuclear Regulatory Commission (NRC) was notified by telephone on 14 Apr 2009 at approximately 4 PM. The event will be investigated further with a detailed explanation of the event and actions taken and planned to prevent recurrence. The NRC will be given a written report on or before 24 Apr 2009. Consequences of this event were not significant. Other radiation monitors were in service to monitor airborne radioactive effluent and reactor bay airborne activity. All of those monitors indicated typical radiation levels during reactor operation. |
| Where | |
|---|---|
| North Carolina State University Raleigh, North Carolina (NRC Region 2) | |
| License number: | R-120 |
| Reporting | |
| Non | |
| Time - Person (Reporting Time:+98.5 h4.104 days <br />0.586 weeks <br />0.135 months <br />) | |
| Opened: | Gerald Wicks 16:00 Apr 14, 2009 |
| NRC Officer: | John Knoke |
| Last Updated: | Apr 14, 2009 |
| 44991 - NRC Website
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North Carolina State University with Non | |
WEEKMONTHYEARENS 571962024-06-27T14:37:00027 June 2024 14:37:00
[Table view]Non Technical Specification (Ts) Reportable Occurrence ENS 565532023-06-02T12:18:0002 June 2023 12:18:00 Non Unscheduled Shutdown ENS 557472022-02-17T18:46:00017 February 2022 18:46:00 Non Technical Specification Violation ENS 527482017-05-10T21:00:00010 May 2017 21:00:00 Non Research Test Reactor - Technical Specification Violation ENS 464842010-12-13T20:00:00013 December 2010 20:00:00 Non Research Reactor Radiography Incident ENS 449912009-04-10T13:30:00010 April 2009 13:30:00 Non Violation of Limiting Conditions in Technical Specification 3.5B 2024-06-27T14:37:00 | |