Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 50307 | 24 July 2014 23:41:00 | At 2315 EDT on July 24th, 2014, CCNPP (Calvert Cliffs Nuclear Power Plant) U1 identified RCS (Reactor Coolant System) pressure boundary leakage from the instrument line to 1-PDT-123A, 11A reactor coolant pump differential pressure transmitter. Technical Specification 3.4.13, Action B was entered and requires that the unit be placed in Mode 3 within 6 hours and Mode 5 within 36 hours. (CCNPP has) initiated plant shutdown in accordance with this Technical Specification. Therefore, this is reportable under 10 CFR 50.72(b)(2)(i) Plant Shutdown Required by Technical Specifications. This is also reportable under 50.72(B)(3)(ii)(A) as a material defect in the primary coolant system that cannot be found acceptable under ASME Section XI, IWB-3600 or ASME Section XI, Table IWB-3410-1. The licensee notified the NRC Resident Inspector.
The licensee reduced reactor power to 10 percent and entered containment. The pressure boundary leak was isolated and the licensee exited the Technical Specification 3.4.13, Action B. The Technical Specification required shutdown was terminated. The licensee is making preparation to increase power to full load. The licensee will notify the NRC Resident Inspector. Notified the R1DO (Gray). |
| ENS 42702 | 12 July 2006 17:17:00 | The licensee was required to secure circulating water pump 26 due to a significant influx of jellyfish. Per the licensee's NPDES (National Pollution Discharge Elimination System) permit, the licensee is required to notify the Maryland Department of Environment of any significant aquatic impact on plant operation. The licensee remained at 100% power throughout and has already restarted the secured circ pump. The licensee notified the NRC Resident Inspector. See similar Event Notifications 42699 and 42700. |
| ENS 42700 | 11 July 2006 11:28:00 | Unusual fish kill on both unit's intake trash racks. Approximately 150-200 Cow Nosed Rays died on the intake racks. The apparent cause was low oxygen levels in the bay water. This event is reportable per Tech Spec Appendix 13, Section. 4.1 for significant environmental events. The licensee contacted the Maryland Department of the environment as a courtesy. The licensee has notified the NRC Resident Inspector. |
| ENS 42699 | 11 July 2006 11:28:00 | On 7/6/06 a significant jelly fish influx required securing 11 Circulating Water Pump on Unit 1 and 26 Circulating Water Pump on Unit 2. Both Units remained at 100 % power, On 7/7/06 Unit 1 was downpowered to 41 % due to similar jelly fish influx and subsequently returned to 100 % power. NPDES permit requires state notification of any significant aquatic impact on the plant. NRC Resident Inspector has been notified. |