ENS 43462
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ENS Event | |
|---|---|
21:52 Jun 29, 2007 | |
| Title | Reactor Trip and Spurious Safety Injection |
| Event Description | At 1752 hours0.0203 days <br />0.487 hours <br />0.0029 weeks <br />6.66636e-4 months <br /> EDT Unit 2 received a 'B' train safety injection (SI). This spurious SI on 'B' train caused a trip of the main feedwater pumps and a turbine trip. The Unit 2 reactor tripped due to the turbine trip. The single train SI resulted in ECCS flow to the RCS. Both trains of SI were manually initiated per station procedures. The 'B' train of SI could not be reset and this resulted in RCS inventory increasing and lifting of the pressurizer PORV's. The pressurizer relief tank rupture disc ruptured and released water to the containment sump. SI flow to the core has been secured. Normal charging has been returned to service. This event is reportable per 10CFR50.72(b)(2)(iv)(A) for ECCS flow to the RCS. 10CFR50.72(b)(2)(iv)(B) for RCS Actuation (Rx/Turbine Trip). 10 CFR50.72(b)(3)(iv)(A) for AFW pump start, containment phase 'A' isolation, ECCS pumps actuation, and EDG starts. The AFW pump auto started during the event and operated as expected. Cause of the 'B' train SI is unknown at this time.
All rods fully inserted. All systems functioned as required with the exception of the 'B' train SI which spuriously actuated and then could not be reset. All equipment started as expected from the SI actuation. AFW is still supplying cooling water to the steam generators at this time and decay heat is being discharged via steam dumps to the condenser. The licensee does not yet know how much water was discharged to the containment sump. The reactor is currently stable at no-load temperature and pressure with the level in the pressurizer a little high but tracking down to normal. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
North Anna  Virginia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.12 h-0.0467 days <br />-0.00667 weeks <br />-0.00153 months <br />) | |
| Opened: | Page Kemp 20:45 Jun 29, 2007 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Jun 29, 2007 |
| 43462 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| After | Hot Standby (0 %) |
North Anna with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge | |
WEEKMONTHYEARENS 571482024-05-29T10:24:00029 May 2024 10:24:00
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ECCS Discharge Reactor Trip and Spurious Safety Injection ENS 432172007-03-07T08:05:0007 March 2007 08:05:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Emergency Diesel Generator Autostart on Loss of "B" Reserve Station Service Transformer ENS 430722007-01-03T23:03:0003 January 2007 23:03:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to a Card Failure ENS 429962006-11-16T07:26:00016 November 2006 07:26:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Trip ENS 424832006-04-08T02:31:0008 April 2006 02:31:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Group Step Counter Failure During Reactor Startup ENS 418982005-08-06T02:28:0006 August 2005 02:28:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Apparently Due to Lightning Strike ENS 408042004-06-10T17:13:00010 June 2004 17:13:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip While Performing Scheduled Solid State Protection Testing ENS 407842004-05-29T06:02:00029 May 2004 06:02:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Control Rod Position Indication Failure During Hot Rod Drop Test 2024-05-29T10:24:00 | |
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