ENS 46813
ENS Event | |
|---|---|
18:44 May 3, 2011 | |
| Title | Alert Declared Due to Fire Affecting Access to Safety Related Equipment |
| Event Description | The licensee has declared an Alert due to a hydrogen fire on the hydrogen pad outside the protected area that resulted in evacuating outbuildings (pump house and air compressor buildings) that contain safety related equipment. The Alert is classified under Emergency Action Level HA-3.2 based on report or detection of gases in concentrations higher than lower flammability limit or contiguous to a safe shutdown or vital area. The licensee has also suspended certain security measures under 50.54(x) and 50.54(y). Security measures were suspended due to risks from the fire with no compensatory measures in-place at this time.
The fire involves hydrogen cylinders delivered to the site to a trailer pad outside the protected area. The fire developed while exchanging a newly delivered trailer of hydrogen cylinders with an expended hydrogen cylinder trailer. The fire brigade has responded and offsite fire departments have responded to the site. Fire water is currently being sprayed on the hydrogen cylinders. There is no indication of any damage to any plant equipment other than the hydrogen trailer area equipment. The driver of the hydrogen supply truck was reported to have sustained some injuries. There are no other reported injuries to plant personnel. The hydrogen water chemistry system has been isolated and makeup hydrogen to the main generator is isolated. The hydrogen isolation has no impact on the licensee at this time. The plant continues to operate at full power and there have been no immediate impacts from the fire to plant operation. The licensee has notified State, and local authorities and the NRC Resident Inspector.
The licensee made a one-hour notification of deviation from technical specifications under 10 CFR 50.54(x) and (y) due to the ongoing hydrogen fire. This was due to safeguards system degradation related to monitoring and detection of the OCA. Contact the Headquarters Operations Officer for details. R3 IRC was notified of this report.
The licensee reported all safeguards systems have been restored and they have exited 10 CFR 50.54(x) and (y). R3 IRC was notified of this report.
At 1855 CDT, Duane Arnold has re-classified the hydrogen trailer fire event to an Unusual Event level. The event is classified as an UE under EAL HU-5.1 based on other conditions that exist which, in the judgment of the emergency director, indicate events are in progress or have occurred which indicate a potential for degradation for the level of safety of the plant. The licensee has allowed access to all areas that were previously restricted due to potential safety concerns from the ongoing fire. The hydrogen trailer cylinders are still being sprayed with water and several cylinders are still showing thermal images above ambient. The licensee will evaluate event termination when the fire can be conclusively demonstrated to be extinguished. The licensee has notified state and local authorities and the NRC Resident Inspector. NRC Region 3 continues to monitor the event. Notified R3 (West), NRR EO (Holian), FEMA (Via), and DHS (Knox).
At 0135 CDT on 5/4/11, Duane Arnold terminated from the Unusual Event. The fire was verified to be out, with no hot spots. The hydrogen tanks have been isolated and the licensee verified no hydrogen is present in the area of the hydrogen pad. The licensee has notified State, local authorities and the NRC Resident Inspector. R3 IRC was notified of this report. Notified R3 (West), NRR (Boger), FEMA (Via), DHS (Hill), HHS (Collins), USDA (Timmons) and DOE (Yates). Will notify R3DO (Ring), NRR EO (Holian), IRD (Marshall). |
| Where | |
|---|---|
Duane Arnold  Iowa (NRC Region 3) | |
| Reporting | |
| Emergency class: | Alert |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(1), 50.54(x) TS Deviation | |
| LER: | 05000331/LER-2011-001 |
| Time - Person (Reporting Time:+-3.08 h-0.128 days <br />-0.0183 weeks <br />-0.00422 months <br />) | |
| Opened: | Ken Carlson 15:39 May 3, 2011 |
| NRC Officer: | John Shoemaker |
| Last Updated: | May 4, 2011 |
| 46813 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Duane Arnold with 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(1), 50.54(x) TS Deviation | |
WEEKMONTHYEARENS 548262020-08-10T17:58:00010 August 2020 17:58:00
[Table view]10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notice of Unusual Event Due to Loss of Offsite Power Due to High Winds ENS 468132011-05-03T18:44:0003 May 2011 18:44:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(1), 50.54(x) TS Deviation Alert Declared Due to Fire Affecting Access to Safety Related Equipment ENS 442912008-06-12T16:30:00012 June 2008 16:30:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unusual Event Declared Due to a Major Loss of Response and Communications Capability ENS 422992006-02-02T00:55:0002 February 2006 00:55:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Site External Communications 2020-08-10T17:58:00 | |