ENS 50854
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ENS Event | |
|---|---|
23:56 Feb 27, 2015 | |
| Title | Unanalyzed Condition Concerning Control Room Habitability Analysis |
| Event Description | Cooper Nuclear Station became aware of the installation of two 12,000 gallon anhydrous ammonia tanks approximately 1.5 miles from the site. This amount of anhydrous ammonia at that distance exceeds the control room habitability hazardous chemical analysis previously evaluated for the nuclear station. The control room staff has been informed of the condition and have reviewed the appropriate abnormal procedures for actions to take in the case of a leak. This potentially represents an unanalyzed condition that significantly degrades plant safety and is reportable under 10 CFR 50.72(b)(3)(ii)(B).
The licensee has notified the NRC Resident Inspector.
Subsequently it was determined that the Control Room Habitability Analysis that was performed in response to the NRC's post-TMI requirements bounds the identified condition. This analysis includes the potential of a toxic chemical leak from a 725-ton tank on a river barge carrying anhydrous ammonia. The volume of chemical, and distance from the control room, included in the post-TMI habitability analysis bounds the conditions found with the newly constructed anhydrous ammonia tanks. The licensee notified the NRC Resident Inspector. Notified the R4DO (Farnholtz). |
| Where | |
|---|---|
Cooper  Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+1.4 h0.0583 days <br />0.00833 weeks <br />0.00192 months <br />) | |
| Opened: | Randy Kouba 01:20 Feb 28, 2015 |
| NRC Officer: | Daniel Mills |
| Last Updated: | Apr 16, 2015 |
| 50854 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 544252019-12-05T14:10:0005 December 2019 14:10:00
[Table view]10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fire Door Discovered Unlatched ENS 508542015-02-27T23:56:00027 February 2015 23:56:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Concerning Control Room Habitability Analysis ENS 494862013-10-30T16:17:00030 October 2013 16:17:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Postulated Fire Event That Could Adversely Impact Safe Shutdown Equipment ENS 460912010-07-13T22:07:00013 July 2010 22:07:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Containment Overpressure Not Ensured in the Appendix R Analysis 2019-12-05T14:10:00 | |
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