Effectiveness of Industry Initiat

Change in Leak Incidence Ra

20 October 2011

David Alley
Agenda

• Objective• Problem• Conclusion
Objective

• Determine Effectiveness of Initiative

– Consider 

• Leaks from pipe and tanks 

– Safety related– Contain hazmat (environmentally sensitive)– Contain radioactive material (by design or cont
Objective

• Determine effectiveness of initiative 

– Expect

• Pre 2009 – some number of leaks• 2009 – 2013 – higher number of leaks higher number of leaks

– Inspection transient 

• Post 2013 – lowest number of leaks

– Improved piping/maintenance

– Must be demonstrated
Problem

• How to determine leak rates

– Three sources

• EPIX• NEI survey results NEI survey results• NRC groundwater contamination

– Not in complete agreement– EPIX reporting criteria changed in 200

• New data inconsistent with old
Problem

• EPIX data base categories, Buried P

– Component

• Pipe, Fitting, Rupture Disk

– Engineering Characteristics Engineering Characteristics

• Safety related• Contains environmentally sensitive fluid• Contains radioactive material• Run to failure• Not run to failure
Problem

• EPIX data base categories, Buried P

– Failure mode

• Significant leak• Leak• External leak• Adverse inspection finding• Other degradation• Other

– 194 total entries as of May 2011
Problem

• NEI data base categories

– Leaks from

• Safety related• Contains radioactive Contains radioactive• Contains environmentally sensitive

– 78 entries 2007-2010
Problem

• Total leaks by year

– EPIX data not limited to safety related, 

radioactive, environmentally sensitive

– As of spring 2011 As of spring 2011

Year INPO Data N

Leak Significant Leak Total Leaks 

2007 10 0 10 2008 1 0 1 2009 62 7 69 2010 57 5 62 Total 130 12 142 
Problem

• Safety related, radioactive, 

environmentally sensitive leaks by y

– As of spring 2011

Year 

INPO Data – Leaks (Not Fun to Failure, Other) 

Environmentally 

Sensitive Radioactive Safety Relevant Total Leaks 

2007 0 0 0 0 2008 0 0 0 0 2009 10 5 2 17 2010 1 3 3 7 Total 11 8 5 24 
Problem

Year INPO

(verbal)

EPIX (all categories)

EPIX (safetyrel., rad., env.)

EPIX(keyword)

NR(gr

2000 2 2 1 0 12001 0 0 0 0 02002 0 0 0 0 02003 2 2 0 2 22004 2 2 0 5 12005 5 5 0 1 22006 0 1 0 0 5

• Older data does not compare well

* Not necessarily buried pipe leaks
Problem

• Categorization issues

– Significant leak of safety related servic

reported as non leak

– Leak of condenser (24 000 pC/l tritium

Leak of condenser (24,000 pC/l tritium

reported as buried pipe “run to failure”

– Sodium hydroxide leak reported as bur

piping “run to failure”

– Essential service water leak reported a

buried piping “not run to failure”
Conclusion

• Data sources are inconsistent with e

other

• Data sources contain some example

miscategorizations

• Pre-2009 data reporting basis incon

with later data

• Very difficult to compare data from 

different sources
Conclusion

• Evaluation of existing data has not 

revealed a useful pre 2009 leak rate

• Comparison with 2009-2013, and po

2013 leak rates may not be producti2013 leak rates may not be producti

• Need to establish a pre-inspection 

transient rate as a metric for compar

• Seeking input