ENS 48239
ENS Event | |
|---|---|
13:00 Aug 27, 2012 | |
| Title | Discovery of After-The-Fact Emergency Condition - Alert - High Co2 Concentration in a Safe Shutdown Area |
| Event Description | At 0927 EDT on 08/28/2012, it was identified that access to a table H-1 Safe Shutdown Area had been prohibited and that an ALERT had not been declared as required by Surry EPIP-1.01, EAL HA 3.1. At 0900 EDT on 08/27/2012, Electrical Maintenance was performing a surveillance on the Unit 2 Cable Vault and Cable Tunnel Low Pressure CO2 System. A high CO2 level was observed using portable gas detection equipment and access to the space was prohibited for a period of approximately 20 minutes. This report is being made in compliance of VPAP-2802, section 6.3.3(h), which states that a one hour report is required if an Emergency Action Level (EAL) is exceeded, the basis for the emergency class no longer exists at the time of discovery, and no other reasons exist for an emergency declaration.
The licensee will notify the NRC Resident Inspector and Virginia Emergency Management Agency.
Based upon initial air monitor readings, EN#48239 reported that an oxygen deficient condition existed in a Table H-1 area for approximately 20 minutes. When the initial information was presented to the Shift Manager on 08/28/2012, it was determined that a one-hour report should have been declared in accordance with EPIP-1.01, Emergency Action Level HA 3.1, which states that an ALERT condition exists if 'access to a Table H-1 area is prohibited due to toxic, corrosive, asphyxiant or flammable gases which jeopardize operation of systems required to maintain safe operations or safely shutdown the reactor.' Since the ALERT condition was not recognized on 08/27/2012, a one-hour report was deemed necessary. A root cause evaluation reviewed the oxygen monitor data and determined that the maximum time of oxygen deficiency was approximately 8 minutes. Operator Time Critical Actions were reviewed to determine whether prohibition of access to the Cable Vault and Cable Tunnel for approximately 8 minutes would jeopardize operation of systems required to maintain safe operations or safely shutdown the reactor. No specific references to activities within this area were identified. Therefore, this event was determined not to be an Alert. The root cause evaluation also noted that Operations was notified of the test, administrative control was established for the CO2 Tank shutoff valve, an Electrician was posted in the control room to notify Operations of alarms associated with the test, a fire watch posted, and the test areas were posted and evacuated. The brief period of time the condition existed did not result in a threat to safe plant operation or the health of plant personnel. Therefore, this event was determined not to be an Unusual Event in accordance with EPIP-1.01, Emergency Action Level HU 3.1, which states, 'report or detection of toxic, corrosive, asphyxiant or flammable gases that have or could enter the Owner Controlled Area in amounts that can affect normal plant operations.' This notification is being made to retract the report made on 08/28/12 based on the above discussion. The NRC Resident [Inspector] has been notified. Notified R2DO (Nease). |
| Where | |
|---|---|
Surry  Virginia (NRC Region 2) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+21.18 h0.883 days <br />0.126 weeks <br />0.029 months <br />) | |
| Opened: | Tim Keating 10:11 Aug 28, 2012 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Jul 15, 2013 |
| 48239 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 482392012-08-27T13:00:00027 August 2012 13:00:00
[Table view]Other Unspec Reqmnt Discovery of After-The-Fact Emergency Condition - Alert - High Co2 Concentration in a Safe Shutdown Area ENS 470772011-06-05T09:01:0005 June 2011 09:01:00 Other Unspec Reqmnt Discovery of After-The-Fact Emergency Condition - Unusual Event ENS 466982011-03-25T04:00:00025 March 2011 04:00:00 Other Unspec Reqmnt Non-Compliance with Nuhoms Technical Specification ENS 428902006-10-07T21:11:0007 October 2006 21:11:00 Other Unspec Reqmnt Discovery of After-The-Fact-Emergency Condition - Unusual Event 2012-08-27T13:00:00 | |