ENS 40210
ENS Event | |
|---|---|
00:50 Oct 1, 2003 | |
| Title | Plant Shutdown Required by Technical Specifications Due to Inoperable Control Center Hvac |
| Event Description | With the plant in Mode 1 and 100% reactor power at 2043 [EDT] on September 30, 2003, while shifting divisions of Control Center HVAC (CCHVAC), the Division 1 chiller failed to start and Division 1 CCHVAC was declared INOPERABLE. At 2050, a restart of Division 2 CCHVAC was attempted and the Division 2 chiller failed to start. Division 2 CCHVAC was declared INOPERABLE, and the plant entered LCO 3.0.3 as required by LCO 3.7.4 Condition D. Plant shutdown was initiated at 2146. Division 1 CCHVAC was declared OPERABLE at 2315, and LCO 3.0.3 was exited. Plant shutdown was terminated at 2315 with the reactor at 84% power. Division 2 CCHVAC remains INOPERABLE and under investigation, with plant operating under LCO 3.7.4 Condition A. Plans are to return to 100% reactor power. All ECCS systems remained OPERABLE during this event.
The NRC Resident Inspector has been notified. This report is being made pursuant to 10 CFR 50.72(b)(2)(i) and 10 CFR 50.72(b)(3)(v)(D).
The licensee is retracting the notification required per 10 CFR 50.72(b)(3)(v) based on the following: At 2050 hours0.0237 days <br />0.569 hours <br />0.00339 weeks <br />7.80025e-4 months <br /> on September 30,2003 with the plant operating at 100 percent reactor power air conditioning chillers for both divisions of the Control Center Air Conditioning System failed to start. Technical Specification (TS) LCO 3.0.3 was entered as directed by LCO 3.7.4, Control Center Air Conditioning System, Condition D.1 and a plant shutdown initiated at 2146 hours0.0248 days <br />0.596 hours <br />0.00355 weeks <br />8.16553e-4 months <br />. Notification was made in accordance with 10 CFR 50.72(b)(2)(i), a Plant Shutdown Required by Technical Specifications. The chiller for Division 1 Control Center Air Conditioning System was started after approximately one hour and subsequently declared operable at 2315 hours0.0268 days <br />0.643 hours <br />0.00383 weeks <br />8.808575e-4 months <br />. TS 3.0.3 was exited and power reduction was terminated at 84 percent reactor power. Notification was also made in accordance with 10 CFR 50.72(b)(3)(v), Event or Condition that Could Have Prevented Fulfillment of a Safety Function. Investigation revealed an oil pressure permissive was not met for start of the chiller due to a small amount of air leaking into a pressure switch while shutdown. This delayed meeting the oil pressure permissive for starting the chiller. Subsequent start attempts removed the air, allowing the pressure permissive to be met and the chiller to be restarted. This restart of the chiller was accomplished from the main control room in accordance with plant procedures. Therefore, Division 1 Control Center Air Conditioning was capable of performing its intended function. This condition is therefore not reportable under 10 CFR 50.72(b)(3)(v). The original notification, Event Number 40210, is retracted. The licensee informed the NRC Resident Inspector. Notified R3DO (Jim Creed). |
| Where | |
|---|---|
Fermi  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-0.12 h-0.005 days <br />-7.142857e-4 weeks <br />-1.64376e-4 months <br />) | |
| Opened: | Mike Himebauch 00:43 Oct 1, 2003 |
| NRC Officer: | Gerry Waig |
| Last Updated: | Oct 20, 2003 |
| 40210 - NRC Website
Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 40210\u003C/a\u003E - \u003Ca href=\"/Fermi\" title=\"Fermi\"\u003EFermi\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EPlant Shutdown Required by Technical Specifications Due to Inoperable Control Center Hvac\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 40210 - Fermi\n","link":"","lat":41.96295277777778,"lon":-83.25779444444444,"icon":"/w/images/5/5b/DTE_Energy_icon.png"}],"imageoverlays":null} | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (84 %) |