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O'Donnell Consulting - MSIPDr. O’Donnell and Dr. Porowski were co-inventors of the Mechanical Stress Improvement Process (MSIP). In considering the stress corrosion cracking problem in the heat affected zone of field welds in BWR primary pumping, they developed a reliable mechanical stress improvement process which applies compressive stresses and is easy to control and verify. MSIP was developed with supporting finite element analysis and tests which show that it provides compressive stress fields in both the axial and circumferential directions at the inner surface of weldments. The Process was developed for pipe-to-pipe, pipe-to-discontinuity (such as valve body) and pipe-to-vessel nozzle configurations.

Utility Plant Pipe & Fittings Nozzles & SE’s Total Notes
CeCo Dresden 3 50 2 52
CeCo LaSalle 2 25 29 54
CeCo Quad Cities 1 36 2 38
CP&L Brunswick 2 0 15 15 1
CeCo Quad Cities 2 43 4 47
Nuclenor Santa Maria de Garona 24 0 24
OKG Aktiebolag Oskarshamn 1 0 1 1
CP&L Brunswick 1 0 10 10
CeCo LaSalle 1 15 15 30
CeCo LaSalle 2 8 0 8
CeCo Dresden 2 82 22 104
PeCo Limerick 2 2 16 18
Northeast Millstone 1 0 22 22
Detroit Edison Fermi 2 6 21 27
CeCo Quad Cities 1 28 12 40
CP&L Brunswick 2 16 20 36 2
CeCo Quad Cities 2 30 14 44 2
Teollisouden Voima Oy TVO 5 0 5
Niagara Mohawk Nine Mile Pt 2 0 1 1
Taiwan Power Kuosheng 2 2 0 2 1
CP&L Brunswick 1 10 24 34 2
Northeast Millstone 1 34 9 43
Iberdrola Cofrentes 0 42 42
Boston Edison Pilgrim 1 16 0 16 2
PeCo Peachbottom 3 10 0 10
PeCo Limerick 1 0 7 7
Cleveland Elec. Perry 1 0 27 27 1
TVA Browns Ferry 3 71 29 100 2
GPU Oyster Creek 70 0 70 2
Georgia Power Hatch 1 18 11 29
TVA Browns Ferry 2 12 0 12 2
PP&L Susquehanna 2 8 6 14
PeCo Limerick 1 4 14 18
Georgia Power Hatch 2 0 18 18
PP&L Susquehanna 2 7 5 12
GSU River Bend 0 28 28
WPPS WNP-2 6 38 44
GPU Oyster Creek 39 16 55
678 479 1157

 

MSIP has been performed at 40 nuclear power plants worldwide:(1) Some weldments with pre-existing cracks

(2) Weldments for replacement piping made of SCC immune materials