ENS 40205
ENS Event | |
|---|---|
04:45 Sep 29, 2003 | |
| Title | 50.72 Non-Emergency - Accident Mitigation |
| Event Description | This report is being made in accordance with 10CFR50.72 section (b)(3)(v)(D).
At 2345 [CDT] on 9/28/03, while performing Turbine Trip Testing, the required sequence of events failed to occur, and it was determined that a turbine trip would not occur when required by Technical Specification 3.3.2.2, Feedwater and Main Turbine High Water Level Trip. Condition B of Specification 3.3.2.2 was entered, requiring restoration [of] highwater level trip capability in two hours, and Condition C requiring that thermal power be reduced to less than 25% in four hours. The feedwater and main turbine high water level trip instrumentation is assumed to be capable of providing a turbine trip in the design basis transient analysis for a feedwater controller failure, maximum demand event. The Level 8 trip indirectly initiates a reactor scram from the main turbine trip (above 30% RTP) and trips the feedwater pumps, thereby terminating the event. The reactor scram mitigates the reduction in MCPR [Minimum Critical Power Ratio]. Since the Turbine trip would not have occurred, the reactor scram would not have occurred. At 0530 on 9/29/03 reactor power was lowered to below 25%. This event was determined to be reportable on 9/29/2003 at 1230 [CDT]. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Cooper  Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+10.62 h0.443 days <br />0.0632 weeks <br />0.0145 months <br />) | |
| Opened: | William Gilbert 15:22 Sep 29, 2003 |
| NRC Officer: | Eric Thomas |
| Last Updated: | Sep 29, 2003 |
| 40205 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (65 %) |
| After | Power Operation (22 %) |