ENS 47775

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v t e ENS Event
04:00 Mar 27, 2012
Title	Historical Unavailability of Emergency Operations Facility Ventilation Due to Maintenance
Event Description	During a review of past maintenance that was performed on the Emergency Operations Facility (EOF) ventilation system, it was identified that there were three periods of time when the maintenance would have impacted the functionality of the facility and the ventilation system would not be able to be restored promptly. Site reporting guidance has been revised to assure accurate reporting. The periods of time where maintenance impacted the functionality of the EOF are as follows: 1. April 30 to May 1, 2009 for approximately 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> due to condenser and air handler replacement. 2. January 14 to 18, 2010 for approximately 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> due to damper and ductwork replacement. 3. November 17 to 19, 2010 for approximately 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> due to a compressor failure. This event is reportable per 10CFR50.72(b)(3)(xiii) as described in NUREG-1022, Rev. 2 since the work activities affected an emergency response facility for the duration of the maintenance. The Senior Resident Inspector has been informed. * * UPDATE ON 10/30/2012 AT 0940 FROM JOHN CAVES TO DAN LIVERMORE * * * On several occasions between August 4, 2009, and November 9, 2011, the Emergency Operations Facility (EOF) ventilation systems were in a degraded state and/or removed from service, for extended periods of time. There were no actual emergencies that occurred during those periods that required activation of the EOF. A calculation indicated that with the degraded air conditioning system during summer conditions, the temperature in the EOF could reach 87 degrees F. While there is no specific temperature limit for EOF habitability, an elevated temperature is of concern when emergency response organization members are under potential stress, as in emergency response situations. On January 25, 2010, Harris staff found a damper in the ventilation system stuck in the nearly closed condition. The damper was reopened on the day it was discovered. A calculation indicated that with the ventilation system in the normal mode and the damper stuck, the carbon dioxide concentration in the EOF could have exceeded 0.5%. The elevated carbon dioxide concentration due to the stuck damper, combined with the stress associated with an actual emergency in a facility and temperatures of 87 degrees, had the potential to impair a key responder's ability to perform an assigned emergency response function. The licensee has informed the NRC Senior Resident Inspector. Notified R2DO (Musser).

ENS 47775 +/-
Where
Harris North Carolina (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness
Time - Person (Reporting Time:+13.9 h0.579 days <br />0.0827 weeks <br />0.019 months <br />)
Opened:	Curtis Bullock 17:54 Mar 27, 2012
NRC Officer:	Donald Norwood
Last Updated:	Oct 30, 2012
47775 - NRC Website
v • d • e

v t e Emergency Notification System
Harris with 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness
WEEKMONTHYEAR2021-04-25T16:00:00 [Table view]
[ENS list for Harris]

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