ENS 43807
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ENS Event | |
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15:15 Nov 27, 2007 | |
Title | Alert Declared Due to Oxygen Deficient Atmosphere |
Event Description | An ALERT was declared at 0915 CST. A nitrogen freeze seal was being used on a 3 inch pipe in the 1B RHR and 1B Containment Spray pump room. A leak developed on the freeze seal jacket. This created an oxygen deficient atmosphere (less than 19.5 percent oxygen). The nitrogen supply was isolated. And the room was evacuated. The alert was declared in accordance with Emergency Action Level (EAL) "hazard alert #7 (HA7)." Additional ventilation was being placed in the area to restore normal oxygen levels.
EAL table entry HA7 is for "Release of toxic or flammable gases within or restricting access to a vital area which jeopardizes operation of systems required to maintain safe operations or establish or maintain safe shutdown. No personnel injuries occurred. Oxygen levels were returned to acceptable levels at 0933 CST. The licensee notified the NRC Resident Inspector.
The ALERT was terminated at 1103 CST. Notified IRD (McDermott), R3DO (Lipa), DHS SWO (Mary Anne), FEMA (Dan Sullivan), DOE (Anthony Parsons), EPA (Ms Ross), USDA (Andrew Watts), and USDA (Rick Turner). |
Where | |
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Byron ![]() Illinois (NRC Region 3) | |
Reporting | |
Emergency class: | Alert |
10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
Time - Person (Reporting Time:+-4.75 h-0.198 days <br />-0.0283 weeks <br />-0.00651 months <br />) | |
Opened: | Jim Lynde 10:30 Nov 27, 2007 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Nov 27, 2007 |
43807 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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