05000220/FIN-2008003-06
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | The following violation of very low safety significance (Green) was identified by NMPNS and is a violation of NRC requirements which meet the criteria of Section VI of the NRC Enforcement Policy, NUREG-1600, for being dispositioned as an NCV. 10 CFR Part 50.54(q) requires licensees to follow and maintain in effect an emergency plan which meets the standards of 10 CFR Part 50.47(b). Nine Mile Points Site Emergency Plan states that emergency action level values are based upon criteria established under NUMARC/NESP-007, Methodology for Development of Emergency Action Levels. NUMARC/NESP-007 directs the licensee to use site-specific values for containment radiation levels corresponding to 20 percent fuel clad damage for the General Emergency EAL 1.3.3, Drywell radiation, threshold value. Contrary to the above, NMPNS identified that the value used was based on an erroneous calculation, completed in March of 1994, that assumed 100 percent fuel clad damage as opposed to 20 percent. This miscalculation led to a non-conservative value for EAL 1.3.3 being in place because the classification would not be made until the containment radiation levels reached a value corresponding to 100 percent core damage. Upon discovery of this error, in February of 2008, NMPNS took immediate action to correct the drywell area radiation value and issued CR 2008-1569, which initiated a root cause evaluation as well as a technical evaluation to understand what redundant EAL thresholds may have been exceeded before the drywell area radiation threshold. The inspectors determined that the error associated with this EAL parameter was of very low safety significance because it would not have delayed the declaration of a General Emergency due to redundant EALs based upon vessel water level that would have been exceeded prior to the drywell radiation monitor reaching its stated threshold |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2008003 Section 4OA7 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | D Dempsey J Furia A Rosebrook E Knutson R Cureton B Bickett |
| INPO aspect | |
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Finding - Nine Mile Point - IR 05000220/2008003 | ||||||||||||||||||||||||||||||||||||||||||
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Finding List (Nine Mile Point) @ 2008Q2
Self-Identified List (Nine Mile Point)
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