ENS 44160
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ENS Event | |
|---|---|
04:00 Feb 23, 2008 | |
| Title | 60-Day Verbal Notification of Invalid Specified System Actuation |
| Event Description | On February 23, 2008, a control room operator was aligning the Containment Purge system for Train B operation and triggered an invalid Containment Vent Isolation (CVI) and Auxiliary Building Isolation (ABI). The operator was removing Train A of the system from operation in accordance with system Operating Instruction (SOI) 30.02, 'Containment Purge System'. The operator made an incorrect assumption that a portion of SOI 90.02, 'Gaseous Process Radiation Monitors', that would have properly blocked and aligned power to the Purge Radiation Monitors had been performed. Therefore, when the operator proceeded with the next step in realigning the radiation monitors, a spike occurred on Radiation Monitor 1-RM-90-131. This caused an invalid actuation of Train B of the CVI and ABI systems. Operators verified the isolation and its cause, and suspended movement of irradiated fuel within the Spent Fuel Pool in response to the Train B CVI/ABI signal. The ABI/CVI signal was reset and Auxiliary Building ventilation was restored in accordance with SOI 30.05, 'Auxiliary Bldg HVAC Systems'.
The following information addresses the criteria for a 60 day verbal report defined in Section 3.2.6, 'System Actuation' of NUREG 1022, 'Event Reporting Guidelines 10 CFR 50.72 and 50.73'. This telephone notification is being made in accordance with 10 CFR 50.73(a)(2)(iv)(A). (a) The specific train(s) and system(s) that were actuated: The spike on the Radiation Monitor initiated an invalid actuation of Train B of the CVI system and ABI system. (b) Whether each train actuation was complete or partial: The Train B CVI and ABI actuation was complete. (c) Whether or not the system started and functioned successfully: The system started and functioned successfully, and all components operated as expected. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1450.73 h60.447 days <br />8.635 weeks <br />1.987 months <br />) | |
| Opened: | Mike Brandon 13:44 Apr 23, 2008 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Apr 23, 2008 |
| 44160 - NRC Website
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WEEKMONTHYEARENS 570772024-02-16T02:24:00016 February 2024 02:24:00
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