ENS 41179: Difference between revisions
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| event date = 11/07/2004 16:35 EST | | event date = 11/07/2004 16:35 EST | ||
| last update date = 11/07/2004 | | last update date = 11/07/2004 | ||
| title = " | | title = "a" Auxiliary Feedwater (Afw) Pump Manually Started Due to Decreasing Steam Generator Water Level. | ||
| event text = The 'A' motor driven AFW pump was manually started in response to lowering Steam Generator (SG) level. The plant was in Mode 1 with reactor power at approximately 7%, preparing for startup of the turbine generator. Steam Generator Feedwater flow to the Steam Generators was being supplied by the main feedwater system through the main feedwater regulating bypass valves operating in automatic control. The operating crew observed a lowering trend in 'C' Steam Generator level. Upon reaching the lower end of the procedurally established normal control band (time=1633), the operating crew took the following actions in accordance with plant procedures: (1) the associated feedwater regulating bypass valve was taken to manual control to attempt restoration of normal SG level, (2) the 'A' motor driven AFW pump was manually started (time= 1635) to supply AFW to the SG and (3) reactor power lowered to reduce steam demand. These actions resulted in the restoration of 'C' SG level to normal. Normal operating SG level is 57%. Lo Lo Steam Generator Level Trip occurs at 25%. The lowest SG level observed during the evolution was approximately 43%. The cause of the irregular Feedwater control is currently being investigated. The plant is currently at approximately 2.5% power with all Steam Generator levels at normal operating levels. No automatic ESF Actuations occurred. The NRC Senior Resident was informed. | | event text = The 'A' motor driven AFW pump was manually started in response to lowering Steam Generator (SG) level. The plant was in Mode 1 with reactor power at approximately 7%, preparing for startup of the turbine generator. Steam Generator Feedwater flow to the Steam Generators was being supplied by the main feedwater system through the main feedwater regulating bypass valves operating in automatic control. The operating crew observed a lowering trend in 'C' Steam Generator level. Upon reaching the lower end of the procedurally established normal control band (time=1633), the operating crew took the following actions in accordance with plant procedures: (1) the associated feedwater regulating bypass valve was taken to manual control to attempt restoration of normal SG level, (2) the 'A' motor driven AFW pump was manually started (time= 1635) to supply AFW to the SG and (3) reactor power lowered to reduce steam demand. These actions resulted in the restoration of 'C' SG level to normal. Normal operating SG level is 57%. Lo Lo Steam Generator Level Trip occurs at 25%. The lowest SG level observed during the evolution was approximately 43%. The cause of the irregular Feedwater control is currently being investigated. The plant is currently at approximately 2.5% power with all Steam Generator levels at normal operating levels. No automatic ESF Actuations occurred. The NRC Senior Resident was informed. | ||
| URL = http://www.nrc.gov/reading-rm/doc-collections/event-status/event/2004/20041108en.html#en41179 | | URL = http://www.nrc.gov/reading-rm/doc-collections/event-status/event/2004/20041108en.html#en41179 | ||
Latest revision as of 22:22, 1 March 2018
| Where | |
|---|---|
Harris  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| LER: | 05000400/LER-2004-006 |
| Time - Person (Reporting Time:+-0.52 h-0.0217 days <br />-0.0031 weeks <br />-7.12296e-4 months <br />) | |
| Opened: | Jim Stanford 21:04 Nov 7, 2004 |
| NRC Officer: | John Mackinnon |
| Last Updated: | Nov 7, 2004 |
| 41179 - NRC Website
| |