ENS 42509
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ENS Event | |
|---|---|
17:00 Apr 18, 2006 | |
| Title | Shield Building Ventillation System Declared Inoperable |
| Event Description | On 4/18/2006, at 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br />, while the plant was operating at full power, the plant entered a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Technical Specification (TS) action statement for both trains of the Shield Building Ventilation (SBV) System being declared inoperable. The SBV System action statement was entered when the plant declared Relay Flacks RR-119 and RR-120 inoperable due to non-qualified fuses and cables being installed in six (6) of the boxes contained in these racks. The instruments associated with the six (6) boxes were not found in Technical Specification required instruments or alarms. The issue was that a downstream failure on the non-qualified Instruments may not have qualified fault protection, therefore a fault could impact safety related equipment. Other Technical Specification equipment affected by the inoperability of RR-119 and RR-120 include both trains of Inadequate Core Cooling Monitoring System (ICCMS), Reactor Vessel Level Indication (RVLIS), Pressurizer Safety Valve Outlet Temperature, and Pressurizer Power Operated Relief Valve Outlet Temperature.
At 1611 actions taken by plant staff returned RR-120 to operable and the 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> action statement for SBV was exited. The plant remains in a 7 Day Limiting Condition of Operation (LCO) pending the return of RR-119. Due to the fact that Train B of SBV has been made operable, a plant shutdown was not commenced. This event is being reported under 10CFR50.72(b)(3)(v)(C) 'Any event that at the time of discovery could have prevented the fulfillment of the safety function of systems that are needed to control the release of radioactive material'. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Kewaunee  Wisconsin (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| LER: | 05000305/LER-2006-002 Re Safety-Related Relay Racks with Improper Quality Classification of Foxboro Signal Conditioning Modules |
| Time - Person (Reporting Time:+3.37 h0.14 days <br />0.0201 weeks <br />0.00462 months <br />) | |
| Opened: | David Karst 20:22 Apr 18, 2006 |
| NRC Officer: | John Knoke |
| Last Updated: | Apr 18, 2006 |
| 42509 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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