POWER LEVEL is the main difference between a Navy reactor and a commercial sized reactor. The largest Navy reactor is smaller than 600 Mwt. The smallest commercial reactor is about 1800 Mwt.
Typical average operating power level for a Navy reactor is about 30%. (Yea, I know they do...
Pressurizer Surge Line weld crack seems to be what they saw. Pressurizer Surge Lines experience cyclic temperature changes due to the difference in temperature between the pressurizer and primary coolant system. The weld adds to the stress. I don't remember US Navy reactors having Surge Line...
