1. Summary Report of the EPRI Standard Radiation Monitoring Program
Dennis Hussey, EPRI
Asian Technical Center ALARA Symposium
Yuzawa, Japan
October 11-13, 2006

2. Overview History of Standard Radiation Monitoring Program (SRMP)
Standard Radiation Monitoring Program Goals
Plant Types and Survey Points
Current Results
US Responses
Summary statistics of
loop piping
channel head surveys
Difference of cold leg and hot leg measurements
Conclusions and Recommendations

3. History of Standard Radiation Monitoring Program (SRMP)
Started in 1978 to study radiation fields in Westinghouse-designed plants
Program expanded to include Combustion Engineering (CE) designs
In 1996, program was suspended because of a lack of industry interest and funding
In 2003, NEI/INPO/EPRI developed the RP2020 Dose Reduction initiative
Take Radiation Off the Table
EPRI was charged to take the technical lead for source term reduction
First goal was to benchmark PWR performance

4. Standard Radiation Monitoring Program Goals
Maintain the history of the program
Much data have been acquired already
Locations should not be change
Make the procedure simple, focused, practical, and routine
North American Technical Center recommendation
Help HP staff so that HP staff can help us
Organize the data to allow correlation to chemistry events and plant design
PWR Monitoring and Assessment Database
Encourage consistent sampling techniques

5. SRMP Monitoring Points
Workshop held in Charlotte March 7-9, 2006 to discuss
Selection of B&W points
Required vs Recommended points
Procedure clarifications
Marker Discussions
Emergency Core Coolant System strainers limit markers with vinyl
New markers made that are etched stainless steel
Discussed further SRMP plans
Pre-oxidation points
Auxiliary system monitoring
Possible smears

6. Westinghouse Monitoring Points
Loop piping
Steam Generator Channel Head

7. Combustion Engineering Monitoring Points
Loop piping
Steam Generator Channel Head

8. Babcock and Wilcox Monitoring Points
Steam Generator Channel Head
Loop piping

9. Current US Survey Results
 Parameter/Plant Type W CE
B&W
Total
Plants
33/48
5/14
5/7
43/69
Total Number of Outages
982
275
180
1437
Loop Dose Rate Measurements
733 60 48
841
Channel Head Dose Rate Measurements
538 27 42
607
% Loop Measurements Received
74.6
21.8
26.7
58.5
% Channel Head Measurements Received
54.8
9.8
23.3
42.2

10. Summary Statistics: Loop Piping—Hot Leg and Cold Leg

11. Summary Statistics: Channel Head Center

12. Summary Statistics: Channel Head, Cold Leg - Hot Leg Difference

13. Conclusions
The Standard Radiation Monitoring Program has been re-instated
The procedures have been simplified for the HP staff
Babcock and Wilcox plants are now included in the program
The historical measurement points have been maintained for reference
The data variability is quite large over time
Westinghouse-designed plants have largest limits, and longest history
Summary stats are not enough for a quantitative analysis of dose rates
The trend of the cold leg having higher radiation fields than the hot leg has been confirmed for Westinghouse and CE plants
Unexpected results obtained for the B&W plants

14. Recommendations
Analyze the data to evaluate the change in radiation fields over time
Time-based data will help understand transient changes in radiation fields
Effects of system changes will be observable
Compare the plants by chemistry operations, steam generator materials, and core duty
SRMP database is combined with the EPRI PWR Chemistry Monitoring and Assessment Database
Combined database also includes
Steam generator information
Limited core duty

15. Acknowledgements EPRI Solutions Sam Choi, Cara Libby PWR ALARA Group
Leonard Rollins, Dan Stoltz
North American Technical Center
David Miller, Scott Schofield
Romain Bouchacourt