05000305/FIN-2010005-05
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Finding | |
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| Title | Changes to Reactor Building Ventilation Flow Rates Potentially Decreases the Effectiveness of the Plan Without Prior NRC Approval |
| Description | The inspectors reviewed CRs that documented changes implemented in 1980 to the reactor building ventilation flow rates. These changes impacted the calibrations of radiation detection instruments that were used in determining entry conditions for EALs at KPS and may potentially decrease the effectiveness of the licensees emergency plan. KPS implemented DCR No. 947 in 1980. This DCR reduced the containment purge fan flow rate from 33,000 cubic feet per minute (cfm) to 26,000 cfm. This change in flow rate was not captured in licensee engineering drawings or in the licensees off-site dose calculation manual (ODCM). Not having the correct containment purge fan flow rate universally documented in plant procedures or engineering documents led to the miscalibration of the containment gas (R12) and containment ventilation (R21) radiation monitors. These radiation monitors are used to help classify plant emergency conditions for the specific EAL schemes (i.e., RG1.1, RG1.2, RS1.1, RS1.2, RA1.1, and RU1.1). The result of this error was that the station could potentially 36 Enclosure classify emergencies inaccurately. For example, if the plant had entered the General Emergency EALs (RG1.1 and RG1.2) based on these radiation monitor outputs, the error could result in an inaccurate protective action recommendation. Pending further review and verification by NRC staff of the impact of the miscalibration of the radiation monitors (R12 and R21) on KPS EAL scheme, including a determination of a decrease in effectiveness of the emergency plan, this issue was considered a URI (URI 05000305/2010005-05, Changes to Reactor Building Ventilation Flow Rates Potentially Decreases the Effectiveness of the Plan Without Prior NRC Approval). |
| Site: | Kewaunee  |
|---|---|
| Report | IR 05000305/2010005 Section 1EP5 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | URI: |
| cornerstone | Miscellaneous |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71114.05 |
| Inspectors (proximate) | D Mcneil R Winter K Riemer J Cassidy D Betancourt K Barclay N Feliz-Adomo M Jones J Beavers V Myers S Shah M Ziolkowskim Kunowskir Krsek K Barclay P Cardona-Morales C Zoia R Winter J Jandovitz J Cassidy D Reeser M Phalen M Bielby D Passehl |
| INPO aspect | |
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Finding - Kewaunee - IR 05000305/2010005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Kewaunee) @ 2010Q4
Self-Identified List (Kewaunee)
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