CH-Reactor Makeup Water and Refueling Water Subsystems

Question 1

What is the CVCS Makeup water subsystem?

Answer 1

Proides pure RX makeup water and borated refueling water to compensate for leakage.

Question 2

Where can the RX Makeup Water Tansk send nonborated water to?

Answer 2

Gas stripper, liquid radwaste evap, boric acid concentrator, solid radwaste for resin xfrs, charging pumps for seal lube, CVCS chemical add tank, RDT, EDT, VCT, charging pumps suct, RWT, and CVCS HUT.

Question 3

Where does the high suction line on the RWT send borated water to?

Answer 3

Through BAMP to SFP to the SFP cleanup subsystem, Through Boric acid filter to blending tee to CVCS charging/letdown system to VCT or charging pump suction.

Question 4

How is the RWT connected to safety injection?

Answer 4

Two 20” line provide water from the RWT to the SI pumps (HPSI, LPSI, and CS)

Question 5

Where do the gravity feed flow paths lead?

Answer 5

Charging Pump Suction

Question 6

What is the blending tee?

Answer 6

Combines nonborated water from the RMWT and borated water from RWT to charging pumps. The changes take about 20 mins to see in the VCT.

Question 7

What is the boric acid batch tank?

Answer 7

Take flow from the RMW pump or BAMP to boric acid batch tank eductor the final solution is directed to the RWT.

Question 8

What can supply emergency boration via gravity flow?

Answer 8

Spent Fuel Pool

Question 9

What is the purpose of the Reactor Makeup Water Tank?

Answer 9

Alternate source for safety related Aux FW Pumps, provides dilute Rx Mkup water during norm op, provides hi quality water to promote recycle of dilution water.

Question 10

What is the design of the Reactor Makeup Water Tank?

Answer 10

Stainless steel 480,000 gal 2 set of redundant 5kW heaters keeps water >40*. Vented to atm and overflow to CVCS HUT sump

Question 11

What is the normal makeup water supply to the RMWT

Answer 11

Demineralized Water and alternately Recycle Monitor Tank in the liquid radwast system.

Question 12

What is the purpose of the Reactor Makeup Water Pumps?

Answer 12

Provide makeup water flow from the RMWT throughout the makeup water subsystem.

Question 13

What is the design of the Reactor Makeup Water Pumps?

Answer 13

CPs rated at 165gpm, power from NH, 1 normally running 1 in standby. Only one pump can run at a time. They trip on lo-lo level and lo discharge pressure.

Question 14

What is the purpose of the Reactor Makeup Water Recirculation Valve?

Answer 14

Opens to allow recirc of Rx Makeup Water back to RMWT at low dilution flows <20gpm. Closes to provide full dilution flow at hi demands when providing makeup water to the VCT.

Question 15

What is the design of the Reacttor Makeup water recirculation valve?

Answer 15

Air operated diaphragm valve normally op by CR. Reverse operated….clockwise will open counterclockwise will close it.

Question 16

What is the design of the Reactor Makeup water recirculation valve?

Answer 16

Air operated diaphragm valve normally op by CR. Reverse operated….clockwise will open counterclockwise will close it.

Question 17

What is the purpose of the Reactor Makeup Water Flow Control Valve?

Answer 17

Controls reactor makeup water flow through the blending tee into the 1.RCS via the VCT or Charging pump suct. 2.Boric Acid batch tank eductor to either the RWT or CVCS hut.

Question 18

What is the design of the Reactor Makeup water flow control valve?

Answer 18

A coriolis type sensor measures flow rate RO sets flow rate valve fails closed on loss of air or power to solenoid control valve.

Question 19

What is the purpose of the Refuling Water Tank?

Answer 19

Supports the ECCS and CS subsystems by providing a source of borated water for ESF pump op, provide borate water for norm op recycle, and provide borated water MKUP during postulated design events.

Question 20

What is the design of the Refueling Water Tank?

Answer 20

Concrete Tank lined with Stainless steel to meet seismic cat 1. Concrete provides sheilding, stores up to 750,000 gal of water borated to 4000-4400ppm, 2 heaters keep between 60-120F, vented to norm exhaust, overflow 2 CVCS HUT sump.

Question 21

What is the makeup source to the RWT?

Answer 21

Normal CVCS HUT via CVCS HUT pump. (Chemistry adjusts boron)

Question 22

When is Boric Acid Batching done?

Answer 22

Shortly before outage to maximize RWT borated water volume for the outage.

Question 23

How can we transer water from the Safety Injection Tanks to the RWT?

Answer 23

Via LPSI or CS pumps

Question 24

How do we detect level in the RWT?

Answer 24

4 Class powered level detectors provide a RAS xfrs suction for the SI pumps to the Containment sump and stops the LPSI pump, 1 non-class stops BAMPs on a lo-lo level in the RWT 1 non-class provide level idication and alarms in CR

Question 25

What is the purpose of the Boric Acid Makeup Pumps?

Answer 25

Provide borated water flow from the RWT throughout the makeup water subsystem.

Question 26

What is the design of the Boric Acid Makeup Pumps?

Answer 26

2 single stage CP with mechanical seals, 165gpm at 150psig discharge press, powered by NH, one can supply enough water for all 3 charging pumps. They also recirculate RWT contents for cleanup through boric acid filter.

Question 27

What is the purpose of the Boric Acid Makeup Pump Recirculation Valve?

Answer 27

Opens to allow recir of boric acid to the RWT on low boration flows <20gpm. Closes to allow full boration flow on high boration demand.

Question 28

What is the design of the Boric Acid Makeup Pump Recirculation Valve?

Answer 28

Air op diaphragm valve norm op by CR. Norm in neutral. Reverse op clockwise will open counterclockwise will close.

Question 29

What is the purpose of the Boric Acid Flow Control Valve?

Answer 29

Control the borated water flow rate to the CVCS charging/letdown subsystem and through the boric acid batch tank eductor.

Question 30

What is the design of the Boric Acid Flow Control Valve?

Answer 30

Coriolis typer sensor measures flow rate from RWT to the blending tee set by CR. Valve fails closed on loss of IA or power

Question 31

What is the purpose of the Boric Acid Batch Tank?

Answer 31

Provides a mean of batching the crystalline boric acid with water for adjusting the concentration in the RWT or SFP.

Question 32

What is the design of the Boric Acid Batch Tank?

Answer 32

Small 630 gal (norm 489gal used) stainless steal with heaters and a motor driven mixer. Water from RMWT used heated to 155*-160* mixer turned on and acid powder is added. Chemistry dept selects amount&discharge pump. AOs keep pump at 33gpm

Question 33

What is the Tech Spec 3.5.5 Refueling Water Tank?

Answer 33

RWT shall be OPERABLE in modes 1-4. >60*, 4000-4400ppm, and water volume acceptable.

Question 34

What are the requirements for Emergency Boration of the RCS? T3.1.104 Borated Sources-Shutdown

Answer 34

At a minimum, one of two borated water sources shall be FUNCTIONAL: SFP or RWT

Question 35

What are the TRMs for T3.1.100 Flow Paths-Shutdown?

Answer 35

A minimum one boron injection flow paths shall be FUNCTIONAL: SFP via gravity to charging pump into RCS RWT via charging pump, HPSI, or LPSI to the RCS.

Question 36

What are the TRMs for the T3.1.101 Flow Paths-Operating?

Answer 36

At least two of three boron injection paths shall be FUNCTIONAL: Gravity from RWT or SFP thru CH-536 to charging pump to RCS, Gravity from RWT thru CH-327 to charging pumps to RCS, from RWT thru CH-164 to pump to RCS.

Question 37

What does a FUNCTIONAL boration system consist of?

Answer 37

Aborated water source, gravity fed suction pathway, a pump powered by ER power supply, and a discharge path.

Question 38

What modifications were made to the CVCS system to support the PVNGS extended loww of all site AC?

Answer 38

Primary FLEX Makeup to RCS is a FLEX RCS pdp from the side. Alt FLEX Makeup to RCS is a FLEX RCS pdp from the bottom.