1) The core barrel, one of the most important components of reactor internal, relied on imports in the past.

2) A complete set od wireoline drill tools include:core barrel assembly. overshot assembly, drill rods, holding dog, hoisting plug, circle wrench rtc.

3) The core barrel itself may be thought of as a special storage chamber for holding the rock core.

4) Moreover,(http:///core barrel.html) the vibrational frequencies of the core barrel in still water are much lower than its corresponding order frequencies in air.

5) Through research and test, the self-reliance manufacturing for the core barrel of pressure water reactor internals has been realized.

6) A core bit is used to accomplish this, in conjunction with a core barrel and core catcher.

7) Cataclasite series; Rate of core recovery; Single Rotary and Double Tube Core Barrel, ; Structure of drilling tool; Drilling technology.

8) After having completed the model analysis of the pressurized water reactor (PWR) core barrel in an 1:10 model, the dynamic characteristics are obtained.

9) The test and popularization results of the method of putting in stalk through pulling apart core by Using the long core barrel in Sichuan hard rocks are simply presented in this article.

10) The core drilling method and the obtained achievement are introduced with respect to the bit and core barrel used in different formation.