110.03 Chemical Shim Control

Question 1

• 110.03 Chemical Shim Control*
• • *

Purposes of Chemical Shim Control

Answer 1

1. K_excess Control
2. Ensure adequate shutdown margin
3. Fine and long term reactivity control to compensate for:

A. Fuel burnup

B. Xenon & Samarium production

4. Allows axial flux profile to be more evenly distributed
5. Allows the use of fewer control rods

Question 2

• 110.03 Chemical Shim Control*
• • *

Boration Thumb Rules

Answer 2

DBW - 10 PCM/ppm

10 gallons BA/ppm