ENS 41638
ENS Event | |
|---|---|
20:55 Apr 25, 2005 | |
| Title | Hpci Declared Inoperable |
| Event Description | On 4/25/05 @1655, Engineering completed an evaluation and notified Operations that leakage at the packing leak off plug on the bonnet of MO-2-23-014, the Unit 2 HPCI Turbine Steam Supply Valve, is part of the ASME Class 2 piping boundary. Per station procedures, upon discovery of leakage from a Class 2 component pressure boundary, the component is declared inoperable. Therefore MO-2-23-014 and the Unit 2 HPCI system was inoperable. Reactor operation is unaffected and Unit 2 remains at 100% power. The inoperability of the HPCI system places the Unit in a 14-day shutdown Tech Spec action statement. Further investigation of the cause and the ASME Code requirements is in progress.
The NRC Resident Inspector was notified
The purpose of this notification is to retract a previous report made on 4/25/05 at 2041 hours0.0236 days <br />0.567 hours <br />0.00337 weeks <br />7.766005e-4 months <br /> (EN# 41638). Notification of this issue to the NRC on 4/25/05 was initially made it's a result of declaring the Unit 2 High Pressure Coolant Injection (HPCI) system inoperable as a result of leakage at the packing leak off line plug on the valve bonnet of the HPCI Turbine Steam Supply valve (MO-2-23-014). It was determined that this condition constituted ASME Section XI Class 2 pressure boundary leakage. Therefore, the associated equipment was declared inoperable in accordance with station procedures. Since the initial report, Engineering has determined that the HPCI system was capable of performing its safety function. Although station procedures require ASME Section XI Class 2 components to be declared inoperable when pressure boundary leakage is determined to exist, the safety function of the MO-2-23-014 was maintained. Leakage through the seal weld on the packing leak off line plug did not affect the capability of the MO-2-23-014 valve to perform its safety function. Therefore, HPCI was capable of performing its safety function. Maintenance was planned and HPCI was removed from service on 4/26/05 to repair the HPCI MO-2-23-014 valve bonnet. The valve was repaired and the system was returned to service by 1730 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.58265e-4 months <br /> on 4/26/05 (CR 328735). The NRC resident has been informed of the retraction. Notified R1DO (Krohn). |
| Where | |
|---|---|
Peach Bottom  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-0.23 h-0.00958 days <br />-0.00137 weeks <br />-3.15054e-4 months <br />) | |
| Opened: | Bill Dalton 20:41 Apr 25, 2005 |
| NRC Officer: | Chauncey Gould |
| Last Updated: | Jun 14, 2005 |
| 41638 - 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 41638\u003C/a\u003E - \u003Ca href=\"/Peach_Bottom\" title=\"Peach Bottom\"\u003EPeach Bottom\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EHpci Declared Inoperable\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 41638 - Peach Bottom\n","link":"","lat":39.75920833333333,"lon":-76.26879444444444,"icon":"/w/images/b/be/Constellation_icon.png"}],"imageoverlays":null} | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |