Pressurized water reactors use lithium hydroxide to neutralize the acidity created by the addition of boric acid to primary coolant solutions. Control of coolant pH is important to limit corrosion of the internal reactor components by the coolant solutions. Enriched lithium is offered by Boron Products in lithium hydroxide monohydrate form and the enrichment level is greater than 99.9 wt% ⁷Li.