ACADs (08-006) Covered Keywords Chemical and volume control system, normal letdown, charging, makeup water flow paths. Description Supporting Material

Chemical and Volume Control System (CVCS) 2

Chemical & Volume Control System 3 Number: AT-1260-PP-CVCSRev: 1 Author: Rob ThomasDate: 4/28/11 Approved: Date: References: 1 AT-1260-LP-CVCS 2 V-LO-TX Chemical & Volume Control System

4 Rev No DateReason for Revision Author’s Initials Supv’s Initials

OBJECTIVES 5 1.List the functions of the Chemical & Volume Control System (CVCS). 2.State the function of each major component in the CVCS. 3.Describe the normal letdown, charging, and makeup water flow paths.

CVCS System Letdown System - removes water from the RCS for filtering, chemical adjustment, and radiation monitoring Charging System - returns water to the Reactor Coolant System (RCS) via the charging pumps from the Volume Control tank (VCT) 6

Functions of CVCS Regulate RCS chemistry for reactivity and corrosion control Maintain pressurizer water level Maintain seal water injection to Reactor Coolant Pump (RCP) seals Provides a means to fill, drain, and pressure test the RCS Provide injection to the RCS during Emergency Core Cooling System (ECCS) initiation 7

CVCS components are made of austenitic stainless steel 8

TV 130 ACCW LTDN HX BTRS 381B LTDN RH HX 128 RHR PRT CL LP3 REGEN HX 8149A8149B8149C M 8146 M 8147 CL LP1 CL LP4 RCP M BTRS BORON SAMPLE BTRS 600 # FC FO 129 VCT TIS 129 TI 130 PT # 131 FO HELBA CIA-A CIA-B IRCORC 8145 PZR FI 145 OTHER RCPS FROM HEAD VENT PRT CIA-ACIA-B MM 8100 F RCDT FROM RCS LP4 ACCW HUT EXCESS LTDN HX 112A RCS FILTER 111B BORON SAMPLE CATION BED DEMIN B A S T RMWST 111A BLENDER 110A M V C T LI 185 LI B SI-A SI-B M M 112B 112C 8471A M RWST SI-A M 112D 112E SI-B M SI-A CCP-A 8471B M SI-B CCP-B M M 8509B 8508B SI-B MM RWST 8509A M M 8508A SI-A SI-B M 8111A SI-B 8111B M SI-A A S 190A8116 SI-A M 8438 S M 8485B 190B FF PT 121 SI-A SI-B M M SEAL WATER HX ACCW M 8109 M RCPRCP BIT 121 NCP BATP-A BATP-B 150 # CHARGING FLOW LETDOWN FLOW SEAL INJECTION FLOW REACTOR MAKEUP FC IRC ORC IRC ORC IRCORC M 182 SI-A & SI-B RE

Chemical & Volume Control System 10 Letdown

Major Components Regenerative Heat Exchanger – transfers heat from letdown flow to charging flow – reduces temperature of letdown prior to orifices to prevent flashing of liquid to steam – preheats charging to minimize thermal stress at RCS penetration 11

Regenerative Heat Exchanger °F 260°F 520°F 100°F Letdown Charging Temperatures are approximate

REGENERATIVE HEAT EXCHANGER 13

Regenerative Heat Exchanger 14

Major Components Letdown Orifices – reduce pressure and limit flow of RCS – two 75 gpm, one 45 gpm – combinations can be used to change letdown flow 15

PRESSURE PERMANENT PRESSURE LOSS Letdown Orifices psig 350 psig 0 psig

Letdown Orifices (Isolation Valves) 17

Letdown Orifices 18

Letdown Orifices (Leak) 19

Major Components Letdown Heat Exchanger – Reduces RCS temperature prior to entering mixed bed demineralizer – Cooled by Aux Component Cooling Water (ACCW) – Reduces temperature to  115 F 20

Letdown Heat Exchanger 21

Major Components Demineralizers – maintain RCS purity – remove corrosion products – remove fission products – maximum flow rate of 120 gpm – operating temperature of ≈ 115 F 22

CONNECTION FOR LOADING ION EXCHANGE RESINS UPPER RETENTION SCREEN CONNECTION FOR DISCHARGING ION EXCHANGE RESIN BED OF ION EXCHANGE RESIN BEADS ION EXCHANGE VESSEL INFLUENT WATER (WATER TO BE PURIFIED) EFFLUENT WATER (PURIFIED WATER) LOWER RETENTION SCREEN ELEMENT Demineralizer 23

Major Components Volume Control Tank (VCT) – used to add hydrogen to RCS to scavenge oxygen minimizes corrosion of RCS – used to degas reactor coolant – Net Positive Suction Head (NPSH) for charging pumps – accepts makeup water to adjust RCS boron concentration 24

V C T Letdown flow Charging pump suction Hydrogen H2H2 N2N2 PC PI PC PI Waste Gas Volume Control Tank (VCT) 25

Chemical & Volume Control System 26 Charging

Major Components Centrifugal Charging Pumps (CCP) – Two, 11-stage CCPs – Auto start on SI signal – 150 gpm at 2800 psig – Powered from emergency 4160 VAC – Can be used for normal charging, but not typically 27

Centrifugal Charging Pump 28

Major Components Normal Charging Pump (NCP) – One, 12-stage centrifugal pump – Normal source of charging flow – 130 gpm at 2543 psig – Not safety related - not required by the Final Safety Analysis Report (FSAR) 29

NORMAL CHARGING PUMP 30

NORMAL CHARGING PUMP 31

Major Components Excess Letdown Heat Exchanger – Can supplement normal CVCS – Allows normal CVCS to be taken out of service, but demineralizers are bypassed (temporary only) – Can be routed to VCT, charging pump suction, or (Reactor Coolant Drain Tank) RCDT – Cooled by ACCW 32

Excess Letdown Heat Exchanger 33

Chemical & Volume Control System 34 Makeup

Letdown / Charging Flow Path Regenerative heat exchanger Flow orifices Letdown heat exchanger Demineralizers Volume control tank Charging pumps Regenerative heat exchanger 35

36

TV 130 ACCW LTDN HX BTRS 381B LTDN RH HX 128 RHR PRT CL LP3 REGEN HX 8149A8149B8149C M 8146 M 8147 CL LP1 CL LP4 RCP M BTRS BORON SAMPLE BTRS 600 # FC FO 129 VCT TIS 129 TI 130 PT # 131 FO HELBA CIA-A CIA-B IRCORC 8145 PZR FI 145 OTHER RCPS FROM HEAD VENT PRT CIA-ACIA-B MM 8100 F RCDT FROM RCS LP4 ACCW HUT EXCESS LTDN HX 112A RCS FILTER 111B BORON SAMPLE CATION BED DEMIN B A S T RMWST 111A BLENDER 110A M V C T LI 185 LI B SI-A SI-B M M 112B 112C 8471A M RWST SI-A M 112D 112E SI-B M SI-A CCP-A 8471B M SI-B CCP-B M M 8509B 8508B SI-B MM RWST 8509A M M 8508A SI-A SI-B M 8111A SI-B 8111B M SI-A A S 190A8116 SI-A M 8438 S M 8485B 190B FF PT 121 SI-A SI-B M M SEAL WATER HX ACCW M 8109 M RCPRCP BIT 121 NCP BATP-A BATP-B 150 # CHARGING FLOW LETDOWN FLOW SEAL INJECTION FLOW REACTOR MAKEUP FC IRC ORC IRC ORC IRCORC M 182 SI-A & SI-B RE

Objectives Review 38 1.List the functions of the Chemical & Volume Control System (CVCS). 2.State the function of each major component in the CVCS. 3.Describe the normal letdown, charging, and makeup water flow paths.