ENS 44004
ENS Event | |
|---|---|
08:14 Feb 23, 2008 | |
| Title | Unusual Event Declared Due to High Dose Equivalent Iodine Greater than Tech Spec Requirement |
| Event Description | Unit 1 was performing a plant shutdown in preparation for a refueling outage. RCS sampling indicated a dose equivalent Iodine-131 reading of 1.41 microCurie/gram with a Technical Specification limit of 1.0 microCurie/gram. As a result, the licensee declared an Notification of Unusual Event (NOUE) under EAL AU121.
To reduce the dose equivalent iodine, the licensee placed maximum purification into service. Actions required to exit the NOUE include reducing dose equivalent iodine to below Technical Specification limits. The licensee has notified the NRC Resident Inspector. Notified R1 (Collins), R1DO (Powell), IRD (Cruz), NRREO (Batemen), NRR (Dyer), DHS (Doyle), and FEMA (Fuller).
The licensee is still in the NOUE. As of 0600, the last RCS sample indicated 1.15 microCurie/gm. NOUE exit criteria will be met when two successive samples indicate less than 1.0 microCurie/gm. Notified R1DO (Powell)
At 0908 EST, three consecutive Reactor Coolant System I-131 activity samples indicated approximately 0.9 microCuries/gm which is less than the Technical Specification limit. The licensee is still in the NOUE and will exit when at least one more sample indicates less than the Technical Specification limit. The licensee will be notifying the NRC Resident Inspector. Notified R1DO (Powell).
At 1035 EST, the licensee exited the NOUE based on four consecutive samples at less than 1.0 microCuries/gm of I-131. Notified R1DO (Powell), NRREO (Bateman), IRD (Cruz), DHS (Inzer) and FEMA (Sweetser). |
| Where | |
|---|---|
Calvert Cliffs  Maryland (NRC Region 1) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-4.2 h-0.175 days <br />-0.025 weeks <br />-0.00575 months <br />) | |
| Opened: | James Grooms 04:02 Feb 23, 2008 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Feb 23, 2008 |
| 44004 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 472082011-08-28T03:02:00028 August 2011 03:02:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event - Transformer Explosion Near Turbine Building ENS 471842011-08-23T18:05:00023 August 2011 18:05:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of an Unusual Event Due to a Seismic Event ENS 462762010-09-24T14:58:00024 September 2010 14:58:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Based on Short Duration Loss of Security Equipment ENS 440042008-02-23T08:14:00023 February 2008 08:14:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to High Dose Equivalent Iodine Greater than Tech Spec Requirement 2011-08-28T03:02:00 | |