ML13056A026

Regulatory Conference Slide Presentation

ML13056A026
Person / Time
Site:	Prairie Island
Issue date:	02/25/2013
From:	James Anderson, Davison K, Defusco K, Ingalls S, Jeffery Lynch Xcel Energy
To:	NRC/RGN-III
References
EA-12-273
Download: ML13056A026 (26)

Text

Prairie Island Nuclear Generating Plant NRC Region III Regulatory Conference February 25, 2013 Loss of 1R-50 Shield Building High Range Vent Gas Radiation Monitor

Agenda Opening Remarks - Jim Lynch, Site Vice President Background, Sequence of Events, and Compensatory Measures - Kerrie DeFusco, Emergency Preparedness Manager Classification - Steve Ingalls, Shift Manager Corrective Actions - Kevin Davison, Director Site Operations Regulatory Significance - Jon Anderson, Regulatory Affairs Manager Conclusion - Jim Lynch, Site Vice President 2

Opening Remarks Violation Response to the loss of 1R-50 Shield Building High Range Vent Gas Radiation Detector failed to restore the capability of the detector to classify emergency action levels, RG1.1, General Emergency, and RS1.1, Site Area Emergency Agree with the performance deficiency Disagree with the significance 3

Background, Sequence of Events, and Compensatory Measures Kerrie DeFusco Emergency Preparedness Manager 4

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Background===

Applicable Initiating Conditions RS1 - Offsite Dose Resulting from an Actual or Imminent Release of Gaseous Radioactivity Exceeds 100 mRem TEDE or 500 mRem Thyroid CDE for the Actual or Projected Duration of the Release.

RG1 - Offsite Dose Resulting from an Actual or Imminent Release of Gaseous Radioactivity Exceeds 1000 mRem TEDE or 5000 mRem Thyroid CDE for the Actual or Projected Duration of the Release Using Actual Meteorology.

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Shield Building Stack Effluent Release Flow Paths NUE = Notice of Unusual Event ALERT = Alert SAE = Site Area Emergency U1 Shield Bldg Stack GE = General Emergency 1R-50 Alarm SAE GE 70 mR/hr 4,300 mR/hr 43,000 mR/hr Hi range Unit 1 Containment (single train range) 1R-22 Alarm NUE ALERT Low range 800 cpm 1,600 cpm 160,000 cpm ERO Activated 6

Sequence of Events 7/24/2011, 1R-50 Shield Building High Range Vent Gas Radiation Detector out of service 7/24/2011, Compensatory measures implemented 2/17/2012, Corrective Action document questioned extended 1R-50 out of service time 5/17/2012, Plant management recognized 1R-50 repairs were not timely 5/18/2012, 1R-50 returned to service 7

Compensatory Measures Monitor 1R-22 1R-22 Measures Vent Stack Releases Serves as an Early Warning Activates the Emergency Response Organization 8

Compensatory Measures 1R-50 Dose Rate Obtain Dose Rate of Sample Chamber Convert Dose Rate to Xenon Concentration Dose Assessment Procedures and Training were Place 9

Compensatory Measures Obtaining Dose Rate 1R-50 Sample Chamber 10

Sequence of Events Missed Opportunities/Learning Timeliness Priority Advocacy 11

Classification Steve Ingalls Shift Manager 12

Classification Xe-133 (uCi/cc) 1R-22 (cpm) 1R-50 (mR/h) 1E-4 200 1E-3 1,100 1600 = NUE 1E-2 8,500 0.32 1E-1 60,000 3.2 160,000 = ALERT; ERO Activated 1E0 500,000 32 1E+1 320 1E+2 3,200 4,300 = SAE 1E+3 32,000 43,000 = GE 13

Classification Diverse Methods Available for Classification Compensatory Measures Fission Product Barrier Dose Assessment 14

Corrective Action Kevin Davison Director Site Operations 15

Corrective Action Behaviors - Advocacy Process - Work Management Improvements 16

Corrective Action Emergency Planning Equipment EP Equipment Single Train EP Equipment Redundant Trains 17

Regulatory Significance Jon Anderson Regulatory Affairs Manager 18

Regulatory Significance 10 CFR 50.47(b)(4), Emergency Classification System 10 CFR 50.47(b)(8), Emergency Facilities and Equipment 19

Regulatory Significance Classification Method <15 minutes Fission Product Barrier Yes Dose Rate 1R-50 Yes (if ERO Activated)

(Compensatory Measure)

Dose Assessment Yes (if ERO Activated)

(Containment Monitors) 20

Classification 10 CFR 50.47(b)(4), Emergency Classification System Site Area and General Emergency could be classified within 15 minutes therefore the finding should be GREEN.

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Regulatory Significance Precedence Issue Standard Significance Effluent Monitor Classification Thresholds 10 CFR 50.47(b)(4) White Inaccurate methods for assessing the 10 CFR 50.47(b)(9) White offsite consequences of a radiological release Reactor Building High Range 10 CFR 50.47(b)(8) Green - Licensee Identified Exhaust monitor was unavailable 38 of 149 months and corrective actions were ineffective in restoring the availability and reliability of the monitor 22

Regulatory Significance 10 CFR 50.47(b)(8), Emergency Facilities and Equipment 1R-50 Compensatory measures were implemented immediately; therefore the finding should be GREEN.

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Closing Remarks Jim Lynch Site Vice President 24

Closing Remarks EP Equipment Advocacy Classification Compensatory Measures Consistent Enforcement 25

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