ENS 46947: Difference between revisions
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StriderTol (talk | contribs) (Created page by program invented by Mark Hawes) |
StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
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| event date = 06/10/2011 08:02 EDT | | event date = 06/10/2011 08:02 EDT | ||
| last update date = 06/10/2011 | | last update date = 06/10/2011 | ||
| title = All Four Channels | | title = All Four Channels of Rps Overpower Flux/Flow Imbalance Protection Trip Discovered to Be Inoperable | ||
| event text = Event: During startup of Unit 1 on June 10, 2011, after increasing power to approximately 50 percent, it was noticed that power range nuclear instrumentation was not responding adequately to power imbalance differences. At 0802 EDT, all four channels of Reactor Protective System instrumentation were declared inoperable. TS 3.3.1., Reactor Protective System (RPS) instrumentation, Condition A, B, and C were entered. RPS Channel D was placed in trip per Condition A. Trouble shooting efforts were immediately initiated. | | event text = Event: During startup of Unit 1 on June 10, 2011, after increasing power to approximately 50 percent, it was noticed that power range nuclear instrumentation was not responding adequately to power imbalance differences. At 0802 EDT, all four channels of Reactor Protective System instrumentation were declared inoperable. TS 3.3.1., Reactor Protective System (RPS) instrumentation, Condition A, B, and C were entered. RPS Channel D was placed in trip per Condition A. Trouble shooting efforts were immediately initiated. | ||
Initial Safety Significance: This issue constitutes a loss of safety function because the nuclear overpower flux/flow imbalance trip function of RPS was not operable. | Initial Safety Significance: This issue constitutes a loss of safety function because the nuclear overpower flux/flow imbalance trip function of RPS was not operable. | ||
Latest revision as of 22:06, 1 March 2018
| Where | |
|---|---|
Oconee  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+3.88 h0.162 days <br />0.0231 weeks <br />0.00531 months <br />) | |
| Opened: | Sandra Severance 15:55 Jun 10, 2011 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Jun 10, 2011 |
| 46947 - NRC Website
| |
Oconee with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |