ENS Event | |
|---|---|
14:02 Aug 17, 2008 | |
| Title | Technical Specification Shutdown Due to Inabililty to Perform a Required Rcs Leak Rate Verification |
| Event Description | During the 2000 CDT pumping of the Drywell Floor Drain Sump on 08/16/2008, the pumps failed to pump as indicated by the integrator reading zero with the pump running. The sump pump was running for approximately 2-3 minutes with the integrator showing no flow. The pump typically auto stops after approximately 30 seconds; since this did not happen, it appears to be a flow restriction and not an integrator problem. 3A DWFDS pump was started first and then 3B DWFDS pump was attempted with no flow noted for either pump.
Both the 3-2001-105 and -106 valves indicated OPEN. Both sump pump breakers were verified ON and a local visual inspection of the 3-2001-105 and -106 valves was performed to verify proper operation. Troubleshooting has determined that the 3-2001-105 valve is failing to OPEN. The 3-2001-105 is a primary containment isolation valve and is currently CLOSED. TS SR 3.4.4.1 requires RCS leakage verification 1 [time per] 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and was last completed at 1600 CDT on 08/16/2008. Unit 3 Shutdown was initiated at 0902 hours0.0104 days <br />0.251 hours <br />0.00149 weeks <br />3.43211e-4 months <br />. The shutdown of Unit 3 was halted at 30% power while the licensee pursued an NOED (Notice of Enforcement Discretion) with NRC. The NRC Resident Inspector has been notified. The licensee will also notified the State. |
| Where | |
|---|---|
Dresden  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-0.85 h-0.0354 days <br />-0.00506 weeks <br />-0.00116 months <br />) | |
| Opened: | Linda Dyas 13:11 Aug 17, 2008 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Aug 17, 2008 |
| 44420 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (30 %) |
WEEKMONTHYEARENS 444202008-08-17T14:02:00017 August 2008 14:02:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown Due to Inabililty to Perform a Required Rcs Leak Rate Verification ENS 407352004-05-08T09:50:0008 May 2004 09:50:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Reactor Startup Cancelled Due to Erratic Source Range Monitor ENS 404682004-01-23T18:20:00023 January 2004 18:20:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Plant Shutdown Required by Technical Specifications 2008-08-17T14:02:00 | |