ML13056A026
| 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
NRC Region III Regulatory Conference February 25, 2013 Loss of 1R-50 Shield Building High Range Vent Gas Radiation Monitor Prairie Island Nuclear Generating Plant Prairie Island Nuclear Generating Plant
2 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
3 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
4 Background, Sequence of Events, and Compensatory Measures Kerrie DeFusco Emergency Preparedness Manager
5 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.
6 Shield Building Stack Effluent Release Flow Paths U1 Shield Bldg Stack 1R-22 Low range Unit 1 Containment (single train range) 1R-50 Hi range Alarm SAE GE 70 mR/hr 4,300 mR/hr 43,000 mR/hr Alarm NUE ALERT 800 cpm 1,600 cpm 160,000 cpm NUE = Notice of Unusual Event ALERT = Alert SAE = Site Area Emergency GE = General Emergency ERO Activated
7 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
8 Compensatory Measures
Monitor 1R-22
1R-22 Measures Vent Stack Releases
Serves as an Early Warning
Activates the Emergency Response Organization
9 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
10 Compensatory Measures Obtaining Dose Rate 1R-50 Sample Chamber
11 Sequence of Events
Missed Opportunities/Learning
Timeliness
Priority
Advocacy
12 Classification Steve Ingalls Shift Manager
13 320 1E+1 43,000 = GE 32,000 1E+3 4,300 = SAE 3,200 1E+2 32 500,000 1E0 160,000 = ALERT; ERO Activated 3.2 60,000 1E-1 0.32 8,500 1E-2 1600 = NUE 1,100 1E-3 200 1E-4 1R-50 (mR/h) 1R-22 (cpm)
Xe-133 (uCi/cc)
Classification
14 Classification
Diverse Methods Available for Classification
Compensatory Measures
Fission Product Barrier
Dose Assessment
15 Corrective Action Kevin Davison Director Site Operations
16 Corrective Action
Behaviors - Advocacy
Process - Work Management Improvements
17 Corrective Action
Emergency Planning Equipment
EP Equipment Single Train
EP Equipment Redundant Trains
18 Regulatory Significance Jon Anderson Regulatory Affairs Manager
19 Regulatory Significance
10 CFR 50.47(b)(4), Emergency Classification System
10 CFR 50.47(b)(8), Emergency Facilities and Equipment
20 Regulatory Significance Yes Fission Product Barrier Yes (if ERO Activated)
Dose Assessment (Containment Monitors)
Yes (if ERO Activated)
Dose Rate 1R-50 (Compensatory Measure)
<15 minutes Classification Method
21 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.
22 Regulatory Significance Green - Licensee Identified 10 CFR 50.47(b)(8)
Reactor Building High Range Exhaust monitor was unavailable 38 of 149 months and corrective actions were ineffective in restoring the availability and reliability of the monitor White 10 CFR 50.47(b)(9)
Inaccurate methods for assessing the offsite consequences of a radiological release White 10 CFR 50.47(b)(4)
Effluent Monitor Classification Thresholds Significance Standard Issue Precedence
23 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.
24 24 Closing Remarks Jim Lynch Site Vice President
25 Closing Remarks
EP Equipment Advocacy
Classification
Compensatory Measures
Consistent Enforcement
26