ENS 40585

v t e ENS Event
20:30 Mar 11, 2004
Title	Voluntary Report Involving Potential Tsc Unavailability During A Dba Loca
Event Description	Monticello Nuclear Generating plant is making a voluntary report with regard to the Technical Support Center (TSC) not meeting design criteria Subsection 8.2-1.f of Supplement 1 to NUREG-0737. This specifies that the TSC will be provided with radiological protection necessary to assure that the radiation exposure to any person working in the TSC would not exceed 5 REM whole body (or its equivalent part of the body) for the duration of the accident. During review of the calculations associated with an on-going Alternative Source Term project, plant staff identified the potential for a radiation shine path to exist from the reactor building to the TSC during a DBA [Design Basis Accident] - Loss of Coolant Accident [LOCA], that could result in radiation levels reaching a point dictating evacuation of the TSC under existing emergency plan procedures. As required by NUREG-0696 and confirmed by the plant staff, existing procedural guidance directs personnel to evacuate to the back-up TSC (located in the EOF) if the TSC cannot be occupied continuously. The NRC resident has been informed of this discovery.' The licensee is continuing their assessment and will determine the appropriate corrective actions.

ENS 40585 +/-
Where
Monticello Minnesota (NRC Region 3)
Reporting

Other Unspec Reqmnt
Time - Person (Reporting Time:+0.87 h0.0363 days <br />0.00518 weeks <br />0.00119 months <br />)
Opened:	Dale Johnson 21:22 Mar 11, 2004
NRC Officer:	Steve Sandin
Last Updated:	Mar 11, 2004
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v • d • e

v t e Emergency Notification System
Monticello with Other Unspec Reqmnt
WEEKMONTHYEAR2004-03-11T20:30:00 [Table view]
[ENS list for Monticello]

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