ENS 43238
ENS Event | |
|---|---|
18:55 Mar 14, 2007 | |
| Title | Hpci Declared Inoperable |
| Event Description | During performance of a Unit 2 High Pressure Coolant Injection System (HPCI) Pump, Valve, Flow and Unit Cooler Functional and In-service Test, the High Pressure Coolant Injection System (HPCI) was declared inoperable. The inoperability is due to failure of AO-2-23-042 "HPCI Steam Line Drain Inboard Isolation to Main Condenser" to open. The AO-2-23-042 is normally open and its passive safety function is to remove any steam condensation from the HPCI pump turbine steam supply line. HPCI is a single train safety system rendered inoperable by this condition.
The licensee notified the NRC Resident Inspector.
The purpose of this notification is to retract a previous report made on 3/14/07 at 2036 hours0.0236 days <br />0.566 hours <br />0.00337 weeks <br />7.74698e-4 months <br /> (EN# 43238). Notification of this issue to the NRC on 3/14/07 was initially made as a result of the discovery of a failure of AO-2-23-042 'HPCI Steam Line Drain Inboard Isolation to Main Condenser' to open. This condition was discovered during performance of a routine Unit 2 High Pressure Coolant Injection System (HPCI) Pump, Valve, Flow and Unit Cooler Functional and In-Service Test. Failure of this valve to open results in water condensing in the HPCI steam supply line. HPCI had already been considered inoperable since approximately 0934 hours0.0108 days <br />0.259 hours <br />0.00154 weeks <br />3.55387e-4 months <br /> on 3/14/07 as a result of the performance of the test. Repairs were made to the AO-2-23-042 valve and HPCI was returned to an operable status by 2205 hours0.0255 days <br />0.613 hours <br />0.00365 weeks <br />8.390025e-4 months <br /> (IR 603918). Since the initial report, it has been determined that this condition is not reportable. HPCI was declared inoperable as a result of the performance of the surveillance test and therefore, the HPCI system inoperability was considered a planned evolution. In accordance with NUREG-1022, reporting of planned inoperabilities are not required to be reported unless a condition is discovered that could have prevented the system from performing its function. Water entering the HPCI steam supply piping only occurred as a result of the performance of the surveillance test and could not have caused HPCI to be inoperable during non-test conditions. The AO-2-23-042 is normally open when HPCI is required to be operable and its passive open safety function is to remove any steam condensation from the HPCI pump turbine steam supply line. The active safety function of the valve is to close on design basis events involving the initiation of HPCI. The passive open safety function is not required when the HPCI system is inoperable for testing. The active safety function was unaffected by this condition. The NRC resident has been informed of the retraction. Notified the 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:+1.68 h0.07 days <br />0.01 weeks <br />0.0023 months <br />) | |
| Opened: | Sara Anderson 20:36 Mar 14, 2007 |
| NRC Officer: | Jason Kozal |
| Last Updated: | Apr 13, 2007 |
| 43238 - 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 43238\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 43238 - 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 %) |