05000317/FIN-2009003-03
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Finding | |
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| Title | Initial Dose Assessment with the Containment Outage Door Opened |
| Description | The inspectors identified a URI associated with the emergency response plan implementing procedures (ERPIPs) for a FHI in the Containment Building. In January 2001, Constellation submitted a license amendment request to modify the conditions of containment closure during core alterations/fuel handling for Units 1 and 2. A new containment outage door assembly was installed on the outside of the equipment hatch opening to provide for a quicker closure, improve safety when the door is open, and allow more flexibility when staging material in the Containment Building during an outage. In support of this amendment request, Constellation conducted an analysis of the design basis FHI. Constellation concluded that since the existing safety analysis assumed the radioactive release is unfiltered via the personnel air lock to the plant main vent, the analysis will also apply to the containment outage door and is not changed if both the personnel airlock and the containment outage door are open at the same time. In conjunction with the NRCs approval of the amendment request in March 2001, Constellation updated Chapter 14.18 of the UFSAR to include the assumption that the containment outage door/equipment hatch will remain open for the duration of the FHI in Containment. Thus, the radioactivity release point could be through the containment outage door and/or through the plant main vent. In a review of associated ERPIPs for a FHI in containment, the inspectors questioned the measures in place to account for a potential release path through the containment outage door. Specifically, the potential release through the containment outage door may be unaccounted for until field monitoring is conducted later during the event. The inspectors noted that the initial dose projection is used to support initial EAL declarations and to make protective action recommendations if warranted by projected radiological conditions at the sites boundary. This item is unresolved pending further review and investigation of stated methods used to obtain an initial dose assessment during a FHI with the containment outage door open such that the inspectors can determine if there is a performance deficiency associated with this issue. The inspectors need to complete the review of Constellations evaluation to determine if the stated methods, systems, and equipment for assessing and monitoring the potential release through the containment outage door are adequate. |
| Site: | Calvert Cliffs  |
|---|---|
| Report | IR 05000317/2009003 Section 1EP6 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71114.06 |
| Inspectors (proximate) | D Silk M Davis K Young D Johnson S Barr G Dentel N Perry R Rolph J Hawkinsg Dentels Kennedy R Rolph K Mangan M Davis |
| INPO aspect | |
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Finding - Calvert Cliffs - IR 05000317/2009003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Calvert Cliffs) @ 2009Q2
Self-Identified List (Calvert Cliffs)
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