ENS 43333
ENS Event | |
|---|---|
13:14 Mar 3, 2007 | |
| Title | Invalid Eccs Actuation During Refueling Outage |
| Event Description | This telephone notification is provided in accordance with 10 CFR 50.73(a)(1), to report an invalid actuation reportable under 10 CER 50.73(a)(2)(iv)(A).
On March 3, 2007, Unit 2 was in a refueling outage. Reactor penetration nozzles were being flushed to remove crud deposits. At 0814 CST, Low Reactor Vessel Level 1, Level 2, and Level 3 alarms were received in the Main Control Room, and the Division 1 Emergency Core Cooling System (ECCS) initiated. The Low Pressure Core Spray (LPCS) pump started on the ECCS initiation signal and injected into the Unit 2 reactor vessel. In addition, the '0' Diesel Generator auto-started, and the Low Pressure Coolant Injection valve (2E12-F042A) auto-opened. Operators verified that reactor vessel and reactor cavity water levels were normal, and then stopped the ECCS injection into the vessel by placing the LPCS pump control switch in pull-to-lock. ECCS is not required to be operable in Mode 5 with the spent fuel pool storage gates removed and water level greater than or equal to 22 feet above the Reactor Pressure Vessel (RPV) flange. Investigation determined that the low reactor vessel water level signal occurred when the flushing wand was inserted into instrument nozzle N14A, which is the reference leg tap for the reactor vessel level instruments. The transient in differential pressure sensed by the level instruments resulted in the invalid actuation. Corrective actions included a revision to the model work order for this task to clearly identify the nozzles that shall and shall not be flushed during this evolution. This event is reportable under 10 CFR 50.73(a)(2)(iv)(A) as an invalid ECCS actuation and invalid system actuation. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Lasalle  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1417.05 h59.044 days <br />8.435 weeks <br />1.941 months <br />) | |
| Opened: | Matt Lacroix 13:17 May 1, 2007 |
| NRC Officer: | Bill Huffman |
| Last Updated: | May 1, 2007 |
| 43333 - NRC Website
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WEEKMONTHYEARENS 552402021-03-10T13:15:00010 March 2021 13:15:00
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