The Republic of Korea currently has 16 pressurized water
reactors around the country and 4 CANDU reactors at Wolsong site.
As the Wolsong site has not enough space for further extension of
its existing more than 300 dry storage casks (also known as silo or
canister), the Korea Hydro and Nuclear Power decided to build a new
modular type of dry storage system, known as MACSTOR KN-400.
Whereas a typical CANDU dry storage cask typically has 9 baskets in
which there are 60 bundles of CANDU spent fuel assemblies, the
MACSTOR can store up to 24000 bundles in a 4 rows x 10 columns
arrangement.It is expected that fingerprinting method will be used
for reverification purpose in the event of a loss of continuity of
knowledge for MACSTOR KN-400. As the MACSTOR KN-400 is new, the
conventional re-verification method of fingerprinting is not fully
This study addresses the reverification issues for MACSTOR
KN-400, which is a new dry storage system for CANDU spent fuel
assemblies. The MACSTOR KN-400 stores spent fuel bundles in 40
cylinders. It employs two types of reverification tubes unlike
single verification tube concept for the single cask storage
system. Monte Carlo modeling for the MACSTOR is expected to be much
more complicated than that of cask as radiation signals will be
influenced by radiations coming from nuclear fuel in the
surrounding cylinders and also due to different collimation
geometry. Obviously the neutron and gamma signals at the
reverification tubes of the MACSTOR KN-400 are expected to be
significantly different from those signals at the tubes of a cask.
The objectives of this study are to assess the finger printing
method for verification of spent fuel and to analyze various
diversion scenarios in the MACSTOR KN-400 CANDU Spent Fuel Dry
- N.G. Chandregowda, S.S. Chirayath, W.S. Charlton, Y. Ham, and S. Sitaraman,
"Assessment of the Fingerprinting Method for the Verification of Spent Fuel in MACSTOR KN- 400 CANDU Spent-Fuel Dry Storage,"
Nuclear Technology 184:3 (2013). See Document
- N.G. Chandregowda, W.S. Charlton, S.S. Chirayath, Y. Ham, S. Sitaraman, and G.H. Ahn ,
"Assessment of the Fingerprinting Method for Verification of Spent Fuel in MACSTOR KN-400 CANDU Spent Fuel Dry Storage ,"
53rd Annual Meeting of the Institute of Nuclear Materials Management, Orlando, Florida, 15-19 July 2012.