ENS 42260
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ENS Event | |
|---|---|
17:04 Jan 15, 2006 | |
| Title | Ts Shutdown Due to Electromatic Relief Valves (Ervs) Declared Inoperable |
| Event Description | At 1014 hours0.0117 days <br />0.282 hours <br />0.00168 weeks <br />3.85827e-4 months <br /> on January 15, 2006, the four Unit 1 Electromatic Relief Valves (ERVs) were declared inoperable due to concerns related to the ERV actuators. These operability concerns originated from inspections and testing performed on the Unit 2 ERVs which indicate evidence of mechanical interference issues that could prevent proper ERV operation (note that Unit 2 was shutdown on January 14, 2006 to perform ERV actuator inspections). In accordance with Technical Specification 3.4.3, Condition B, 3.5.1 Condition H, and 3.6.1.6 Condition B, Unit 1 commenced a shutdown on January 15, 2006 at 1104 hours0.0128 days <br />0.307 hours <br />0.00183 weeks <br />4.20072e-4 months <br />.
This notification is being made in accordance with 10 CFR 50.72(b)(2)(i) as commencement of any nuclear plant shutdown required by the plant's Technical Specifications. During the upcoming Unit 1 outage, actuator inspections and ERV testing is planned to confirm the operational ability of the ERVs. Note that the Unit 1 Target Rock Relief Valve and the Main Steam Safety Valves are operable and available to support reactor overpressure protection. The plant is conducting a normal shutdown per Tech Spec requirements. At 16:00 CST the unit will going off line and by 24:00 CST the plant is expected to be in Mode 4 (Cold Shutdown). The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Quad Cities  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-4.47 h-0.186 days <br />-0.0266 weeks <br />-0.00612 months <br />) | |
| Opened: | Kevin O'Shea 12:36 Jan 15, 2006 |
| NRC Officer: | John Knoke |
| Last Updated: | Jan 15, 2006 |
| 42260 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (85 %) |
| After | Power Operation (85 %) |
WEEKMONTHYEARENS 499772014-03-31T18:02:00031 March 2014 18:02:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Unit 2 Reactor Pressure Boundary Leakage and Unit Shutdown ENS 477992012-04-02T19:52:0002 April 2012 19:52:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Initiation of Reactor Shutdown Required by Technical Specifications (Ts) 3.8.1.F ENS 453332009-09-09T01:10:0009 September 2009 01:10:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Reactor Shutdown Required by Technical Specifications Due to an Unisolable Leak in a Core Spray Minimum Flow Line ENS 429042006-10-13T15:34:00013 October 2006 15:34:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Initiation of Reactor Shutdown Required by Technical Specification 3.1.7, Action C.1 ENS 422602006-01-15T17:04:00015 January 2006 17:04:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Ts Shutdown Due to Electromatic Relief Valves (Ervs) Declared Inoperable 2014-03-31T18:02:00 | |
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