Table 9. Percentage of wood-loss Trom timbers submerged for periods of I, 2, and 

 3 years in the vicinity of the Millstone Nuclear Power Station, from 

 1983-1985. 



NOTE: The Douglas Fir and Red Oak data are based on direct weights and the 

 pressure-treated wood data are based on visual estimates of radiographs. 

 Timbers were lost from pots and assumed totally destroyed by woodborers. 

 — Timbers were lost from pots, but this loss was not related to woodborers. 



DISCUSSION 



The timber study quantified the annual loss of wood at the five sites in the vicinity of MNPS, and 

 detenmined the longevity of five types of wood commonly used in marine construction. The untreated 

 woods have provided direct weight data to compare wood-loss between sites, and the percentage of wood 

 lost in the chemically treated woods has been calculated on the basis of visual estimates of wood-loss 

 using radiographs. 



The chemical treatments applied to the timbers protected the wood from woodborer attacks. However, 

 woodborers readily recruited into the untreated wood grain exposed by the preparation of timbers. Within 

 the first year, between 1-10% of the wood in the CCA treated timbers was lost and after three years 



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