ENS 44186
ENS Event | |
|---|---|
20:30 May 4, 2008 | |
| Title | Hpci Declared Inoperable |
| Event Description | During the required quarterly oil sample taken following scheduled flow rate surveillance, the Unit 2 HPCI oil system was found to contain excessive amounts of water. HPCI declared inoperable.
This event is reportable under 10CFR50.72(b)(3)(v)(B), 'Any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to remove residual heat.' Unit 2 remains at 100% power 14 day TS LCO 3.5.1 has been entered and troubleshooting is in progress. NRC Resident has been notified.
ENS Event Number 44186, made on May 4, 2008, is being retracted." NRC Notification 44186 was conservatively made to ensure that the Eight-Hour Non-Emergency reporting requirements of 10 CFR 50.72 were met when a required quarterly oil sample taken following a flow rate surveillance on the Unit 2 High Pressure Coolant Injection (HPCI) System indicated that the turbine oil system contained excessive amounts of water. An evaluation performed in response to this report concluded that the HPCI System was capable of performing its intended safety function even though the turbine oil system contained more water than recommended in the TVA Lubrication Oil Analysis and Monitoring Program. TVA found through visual inspection and engineering evaluation that the amount of water contained in the turbine oil system would not impact the HPCI operation during its' mission time for the Design Basis Loss-of-Coolant Accident. As such, the circumstances discussed in the report did not result in any condition that at the time of discovery could have prevented the fulfillment of the safety function of structures of system that are needed to remove residual heat. Thus, there was no impact on nuclear safety. Therefore, this event is not reportable under 10 CFR 50.72(b)(3)(v)(B). TVA's evaluation of this event notification is documented in the corrective action program. The licensee has notified the NRC Resident Inspector. The licensee has changed the oil and continues to monitor the oil reservoir monthly until the problem causing the excessive water (Turbine Admission valve) is corrected . Notified R2DO (O'Donohue) |
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| Time - Person (Reporting Time:+1.73 h0.0721 days <br />0.0103 weeks <br />0.00237 months <br />) | |
| Opened: | Todd Bohanan 22:14 May 4, 2008 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Jun 30, 2008 |
| 44186 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |