ENS 40821
ENS Event | |
|---|---|
18:00 Jun 16, 2004 | |
| Title | 24 Hour Notification of Plant Exceeding Its Power Limit |
| Event Description | At 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on June 16, 2004, it was confirmed that the plant had operated in excess of its licensed maximum power limit of 3758 megawatts thermal by about two (2) megawatts thermal. The power limit was determined to have been exceeded due to a feedwater temperature RTD being replaced on May 24, 2004, without having installed a matching transmitter. This error caused a non-conservative input into the core power calculation resulting in a small error. The error allowed the power to be about two (2) megawatts above the limit while indicating that it was within requirements. This condition occurred during two periods on 06/14/04 and 06/15/04. On 06/14/04 the first occurrence lasted for approximately 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />. The second occurrence lasted for 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> commencing on 06/14/04 and terminating on 06/15/04. The licensee identified this condition on 06/15/04 @ 1130 and the condition was corrected on 06/15/04 @ 1315.
This notification is being submitted in accordance with PNPP Operating License Condition 2.F, as a potential violation of the Maximum Power Level specified in PNPP Operating License The licensee notified the NRC Resident Inspector.
A 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> notification was made on June 16, 2004, in accordance with [Perry Nuclear Power Plant] PNPP Operating License Condition 2.F, a potential violation of the maximum power level specified in PNPP Operating License Condition 2.C(1). At the time of discovery, maximum licensed power level was determined to have been exceeded by about 2 megawatts thermal as a result of a feedwater resistance temperature detector (RTD) being replaced without installing a matching transmitter. The feedwater temperature provided by this RTD provides an input to the core power calculation and was initially determined to have caused an error in the calculation of about 3.1 megawatts. Subsequently, as-found calibration data was taken that determined the RTD loop error was smaller than initially calculated. The resultant error in thermal power was calculated to be 0.1 megawatts. Review of the power history using the recalculated thermal power error resulted in a determination that the maximum licensed power level was not exceeded. Since the maximum licensed power level was not exceeded, this notification retracts ENF 40821. This retraction was discussed with the Resident NRC Inspector. Notified R3DO (Clayton) |
| Where | |
|---|---|
Perry  Ohio (NRC Region 3) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+-2.13 h-0.0888 days <br />-0.0127 weeks <br />-0.00292 months <br />) | |
| Opened: | Steven Benedict 15:52 Jun 16, 2004 |
| NRC Officer: | Chauncey Gould |
| Last Updated: | Aug 16, 2004 |
| 40821 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 507182015-01-06T21:30:0006 January 2015 21:30:00
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