ENS 44305
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ENS Event | |
---|---|
03:15 Jun 19, 2008 | |
Title | Meteorlogical Mixing Calculations Unavailable |
Event Description | This is an 8-hour non-emergency event notification in accordance with 10 CFR 50.72(b)(3)(xiii) due to a loss of emergency assessment capability. On June 18, 2008, at approximately 2015 PDT, the backup meteorological tower 60-meter air temperature indication failed. The primary meteorological tower is also unavailable. This results in a loss of the delta temperature function. This delta temperature function would be used to determine air mixing for offsite does calculations in the event of an emergency. Without actual delta temperature data, procedures specify conservative assumptions for determining air mixing.
Other meteorological functions (10-meter temperature, wind speed and wind direction, and 60-meter wind speed and wind direction) remain functional. The licensee notified the NRC Resident Inspector. |
Where | |
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Diablo Canyon California (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
Time - Person (Reporting Time:+1.75 h0.0729 days <br />0.0104 weeks <br />0.0024 months <br />) | |
Opened: | Murell Evans 05:00 Jun 19, 2008 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Jun 19, 2008 |
44305 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 533612018-04-24T10:57:00024 April 2018 10:57:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Containment Radiation Monitors Inoperable ENS 493342013-09-09T20:00:0009 September 2013 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Partial Loss of Communications Capability in Technical Support Center ENS 491732013-07-03T07:00:0003 July 2013 07:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Communications Due to a Loss of Ancillary Power ENS 487862013-02-27T00:30:00027 February 2013 00:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability Due to Vital Inverter Maintenance ENS 486002012-12-18T02:04:00018 December 2012 02:04:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Vent Continuous Radiation Monitors Inoperable ENS 483392012-09-25T12:55:00025 September 2012 12:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Removed from Service for Maintenance ENS 481712012-08-09T17:00:0009 August 2012 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Data Network Maintenance ENS 443052008-06-19T03:15:00019 June 2008 03:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Meteorlogical Mixing Calculations Unavailable ENS 426402006-06-14T16:41:00014 June 2006 16:41:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Erds Inoperable ENS 413022004-12-31T11:15:00031 December 2004 11:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Notification Sirens 2018-04-24T10:57:00 | |
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