Chemical Volume and Control Chemical Volume and Control SystemSystem

Chapter 5.0

Learning ObjectivesLearning Objectives

1. List the purposes of the chemical and volume control system (CVCS).

2. List in flow path order and state the purpose of the following major components of the CVCS:

a. Regenerative heat exchangerb. Letdown flow control valvesc. Letdown heat exchangerd. Letdown back pressure regulatore. Letdown filterf. Ion exchangersg. Volume control tank (VCT)h. Charging pump

Learning ObjectivesLearning Objectives

3. Identify the components in the CVCS that are used to purify the reactor coolant and the types of contaminants each is designed to remove.

4. Describe how the makeup system is used to borate, dilute, and makeup a blended flow of boric acid to the reactor

l t t (RCS)coolant system (RCS).

5. Explain why and for what plant conditions the following chemicals are added to the RCS:

a. Lithium hydroxideb. Hydrogenc. Hydrazine

Learning ObjectivesLearning Objectives

6. Describe the emergency boration flowpath,

and identify the plant conditions which would require its use.

7 List the plant operations that result in large amounts of in7. List the plant operations that result in large amounts of in fluent into the boron management system.

8. Identify the changes in the CVCS that occur upon the receipt of an engineered safety features signal (ESF).

Learning ObjectivesLearning Objectives

9. Explain how the CVCS is designed to prevent the following:

a. Flashing and pressure transients in the regenerative and letdown heat exchangers.

b. High temperature in the letdown ionb. High temperature in the letdown ion

exchangers

10. List the automatic actions initiated by VCT level instrumentation.

System PurposesSystem Purposes

1. Purification of the RCS,

2. Control of RCS boron concentration,

3. Control of RCS volume (pressurizer level),

4. The addition of corrosion inhibiting chemicals to the RCS,

5. Collection of RCP controlled bleed off,

System PurposesSystem Purposes

6. Adds boron to the RCS in the event of an accident,

7. Supplies pressurizer auxiliary spray,

8. Provides continuous on-line measurement of RCS boron concentration and RCS activity and

9. Provides a means of testing the high pressure safety injection (HPSI) check valves.

Figure 5-2 CVCS Diagram

R

B

LetdownFilters

From SDC

WPS205 PSIG

F

CV-201Q

CV-201P

145°F

120°F

T P

T

460 PSIG

600 PSIG

WPS

70 PSIGWPS

CV-506

CV-183

AB

CBCV-518

CV-519

CV-517395°F

T

Aux Spray

"11A" RCP

"12B" RCP

544.5°F

CV-515 CV-516

470°F

263°F

T

Regen HeatExchanger

CB AB

FromRCPs

CV-110Q

CV-110P

LetdownFlow

Control

CV-521

To SDCCV-500

Back PressureRegulators

CCW

CV-223

ExcessFlow

CheckValve

VCT

11

12

13

Typical

ChargingPumps

ChemicalAddition

CV-504

RWT

BAMU Tanks

CV-501

80 PSIG

WPS

MakeupSystem

Deb

orating

Mixe

d Be

d

Mixed

Bed

Demineralizers

CV-520

LetdownStrainer

CV-505 H2/N2

Waste GasSystem

WPS

HPSI