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Technical Discussions
John McCanna
John McCanna
07:14 Sep-28-1999
TOFD inspection of Dry Fuel Storage Cask Closure Welds

1. I am seeking information on the application of automated TOFD to Dry Fuel (Nuclear) Storage Cask closure welds (stainless steel)?

2. Is it a suitable replacement radiography?

3. Can anyone provide a list of suppliers for this type of UT equipment as applied to the nuclear environment?


 
 Reply 
 
Jan Verkooijen
Director,
Sonovation, Netherlands, Joined Nov 1998, 29

Jan Verkooijen

Director,
Sonovation,
Netherlands,
Joined Nov 1998
29
08:24 Sep-30-1999
Re: TOFD inspection of Dry Fuel Storage Cask Closure Welds
John,

-TOFD is used quite extensively in the nuclear industry.
In fact, this is where most of the initial development
took place.
However, for this particular application,
because you say it is stainless steel, TOFD would probably
not be the best technique to use.
Because TOFD images not only anomalies (defects), but is
also sensitive enough to pick up grain boundaries, it is
usually difficult to discriminate the grain noise from
the diffraction signals at the extremities of flaws.
TOFD's role when it concerns stainless steel is therefore
mostly restricted to sizing, after detection with L-wave
Pulse-Echo probes, sometimes in combination with creep
waves etc.
-TOFD is certainly a good replacement for the standard
radiography as used in day to day practice, by example
for the inspection of piping welds during fabrication,
in the (petro-) chemical industry, which would normally
be done by conventional Gamma ray, using single exposures
(straight through the weld). When it comes to replacing
radiography utilising multiple exposures over the bevels,
TOFD will have to be complemented by other techniques such
as automated pulse-echo to achieve the same probability
of detection.
-Since nearly 20 years, AEA Sonomatic supply TOFD equipment,
services and training.

Jan Verkooijen
AEA Sonomatic


: 1. I am seeking information on the application of automated TOFD to Dry Fuel (Nuclear) Storage Cask closure welds (stainless steel)?

: 2. Is it a suitable replacement radiography?

: 3. Can anyone provide a list of suppliers for this type of UT equipment as applied to the nuclear environment?




 
 Reply 
 
Marc Hoppenbrouwers, RTD
Marc Hoppenbrouwers, RTD
00:57 Oct-04-1999
Re: TOFD inspection of Dry Fuel Storage Cask Closure Welds
xplains the name Bandscan). Each probe has a specific task in a specific depth zone. Due to the narrow focussed beam it is also possible to size quite accurately the length and height of welding defects. This concept has been developed for inspection of nuclear components in the beginning of the eighties in corporation with BAM in Berlin and was later on applied in our widely-used ROTOSCAN systems.

For more information please visit our homepages at:

http:\\www.rtd.nl (Head Office in the Netherlands)
http:\\www.rtdquality.com (Canada)

Best regards,

Marc Hoppenbrouwers
RTD, Rotterdam


: John,

: -TOFD is used quite extensively in the nuclear industry.
: In fact, this is where most of the initial development
: took place.
: However, for this particular application,
: because you say it is stainless steel, TOFD would probably
: not be the best technique to use.
: Because TOFD images not only anomalies (defects), but is
: also sensitive enough to pick up grain boundaries, it is
: usually difficult to discriminate the grain noise from
: the diffraction signals at the extremities of flaws.
: TOFD's role when it concerns stainless steel is therefore
: mostly restricted to sizing, after detection with L-wave
: Pulse-Echo probes, sometimes in combination with creep
: waves etc.
: -TOFD is certainly a good replacement for the standard
: radiography as used in day to day practice, by example
: for the inspection of piping welds during fabrication,
: in the (petro-) chemical industry, which would normally
: be done by conventional Gamma ray, using single exposures
: (straight through the weld). When it comes to replacing
: radiography utilising multiple exposures over the bevels,
: TOFD will have to be complemented by other techniques such
: as automated pulse-echo to achieve the same probability
: of detection.
: -Since nearly 20 years, AEA Sonomatic supply TOFD equipment,
: services and training.
:
: Jan Verkooijen
: AEA Sonomatic

:
: : 1. I am seeking information on the application of automated TOFD to Dry Fuel (Nuclear) Storage Cask closure welds (stainless steel)?

: : 2. Is it a suitable replacement radiography?

: : 3. Can anyone provide a list of suppliers for this type of UT equipment as applied to the nuclear environment?




 
 Reply 
 
Brian Scholes
Brian Scholes
03:39 Jan-15-2000
Re: TOFD inspection of Dry Fuel Storage Cask Closure Welds
John...

As a follow up & clarification...

The Casks we are using at Pickering are carbon steel.

We are currently using 320KV/AA film on a weld profile 1 1/4" (30mm) thick.

I'm not sure if you were involved when Structural Integrity came up to do their TOFD demonstration...

Regards,

Brian Scholes ext4413

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

: 1. I am seeking information on the application of automated TOFD to Dry Fuel (Nuclear) Storage Cask closure welds (stainless steel)?

: 2. Is it a suitable replacement radiography?

: 3. Can anyone provide a list of suppliers for this type of UT equipment as applied to the nuclear environment?




 
 Reply 
 
Mariano
Mariano
05:17 Nov-06-2006
Bruno
http://somalounger.275mb.com/


 
 Reply 
 

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