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| Entered date | Event description | |
|---|---|---|
| ENS 49889 | 10 March 2014 22:43:00 | An extent of condition review identified that there were unfused 250 VDC circuits for the battery charger ammeters and the control circuits for various DC lube oil pumps which left the turbine building and went through the respective cable spreading room and up into the Control Room. These circuits are protected by 200 amp fuses and in some cases 100 amp fuses. The concern is that under the fire safe shutdown rules, it is postulated that a fire in one fire area can damage these circuits and cause short circuits without protection that would overheat the cables and possibly result in secondary fires in other fire areas where the cables are routed. The secondary fires could adversely affect safe shutdown equipment and potentially cause the loss of the ability to conduct a safe shutdown as required by 10 CFR 50 Appendix R. This condition is reportable as an 8-hour ENS report in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. Compensatory measures (fire watches) have been implemented for affected areas of the plant. The licensee has notified the NRC Resident Inspector. |
| ENS 44004 | 23 February 2008 04:02:00 | Unit 1 was performing a plant shutdown in preparation for a refueling outage. RCS sampling indicated a dose equivalent Iodine-131 reading of 1.41 microCurie/gram with a Technical Specification limit of 1.0 microCurie/gram. As a result, the licensee declared an Notification of Unusual Event (NOUE) under EAL AU121. To reduce the dose equivalent iodine, the licensee placed maximum purification into service. Actions required to exit the NOUE include reducing dose equivalent iodine to below Technical Specification limits. The licensee has notified the NRC Resident Inspector. Notified R1 (Collins), R1DO (Powell), IRD (Cruz), NRREO (Batemen), NRR (Dyer), DHS (Doyle), and FEMA (Fuller).
The licensee is still in the NOUE. As of 0600, the last RCS sample indicated 1.15 microCurie/gm. NOUE exit criteria will be met when two successive samples indicate less than 1.0 microCurie/gm. Notified R1DO (Powell)
At 0908 EST, three consecutive Reactor Coolant System I-131 activity samples indicated approximately 0.9 microCuries/gm which is less than the Technical Specification limit. The licensee is still in the NOUE and will exit when at least one more sample indicates less than the Technical Specification limit. The licensee will be notifying the NRC Resident Inspector. Notified R1DO (Powell).
At 1035 EST, the licensee exited the NOUE based on four consecutive samples at less than 1.0 microCuries/gm of I-131. Notified R1DO (Powell), NRREO (Bateman), IRD (Cruz), DHS (Inzer) and FEMA (Sweetser). |