201.04 PZR, PRT, and RCDT

Question 1

• 201.04 PZR, PRT, and RCDT*
• • *

Pressurizer Functions

Answer 1

Attain normal operating pressure of 2235 psig during plant heatup

Maintain required pressure during steady state operations

Limit pressure changes caused by coolant thermal expansion and contraction

Assure no bulk boiling during Condition I or II accidents

Prevent primary pressure from exceeding 110% of design (2500 psia) at 2735 psig (T.S. Safety Limit)

Question 2

• 201.04 PZR, PRT, and RCDT*
• • *

PZR Heater Function

Answer 2

puts energy into PZR water volume to raise temperature and pressure

• 117 heaters*
• 17.95 KW each*
• 2100 KW total*
• Nichrome wire w/ magnesium oxide insulator*
• Hermetically sealed, designed for full pressure in event of sheath leak*
• (2485 psig at 680 F)*