ENS Event | |
|---|---|
18:18 Mar 17, 2014 | |
| Title | Displayed Meteorological Data Potentially Inaccurate |
| Event Description | At 1418 EDT on 03/17/2014, it was determined the atmospheric stability classification data display on the plant process computer (PPC) could have been potentially inaccurate.
In September 2012, implementation of a hardware and software modification to separate the meteorological tower computer from the PPC introduced a calculation error to the PPC software design that resulted in the PPC potentially displaying inaccurate stability class data. The ability to accurately perform dose assessment calculations could potentially be affected when using the stability class indication obtained from the PPC. The availability and accuracy of backup stability class data via the meteorological tower computer or from Weather Services International were not affected. Within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of discovery, the procedurally described alternatives for obtaining stability class data were implemented. Subsequently, the PPC stability class software calculation was corrected and the PPC stability class display restored for use. There was no impact to any emergency declaration because there were no actual emergencies from the time the modification was implemented until the error was corrected. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Palisades  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-3.1 h-0.129 days <br />-0.0185 weeks <br />-0.00425 months <br />) | |
| Opened: | Terry Davis 15:12 Mar 17, 2014 |
| NRC Officer: | Dong Park |
| Last Updated: | Mar 17, 2014 |
| 49924 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (64 %) |
| After | Power Operation (64 %) |
WEEKMONTHYEARENS 565012023-05-02T19:00:0002 May 2023 19:00:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communications ENS 499242014-03-17T18:18:00017 March 2014 18:18:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Displayed Meteorological Data Potentially Inaccurate ENS 447452008-12-29T11:15:00029 December 2008 11:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Ens and Commercial Phone Service ENS 435942007-08-24T23:57:00024 August 2007 23:57:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Process Computer Parameters to Erds ENS 420532005-10-12T21:09:00012 October 2005 21:09:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Plant Process Computer 2023-05-02T19:00:00 | |