RBCCW Flashcards
WHat is the purpose of the RBCCW system?
Used to cool Reactor Auxiliary systems and related equipment and minimize release of radioactive material to the environs
How does RBCCW support controlling the release of radioactive materials?
Operates at a lower pressure than the loads it services - all leakage is into RBCCW.
Operates at a lower pressure thant Service water which provides the cooling for RBCCW, so RBCCW does not leak out.
How many “loops” of RBCCW are there and what is in each?
3: Loop 1: DW DW Coolers DW Equipment Drain Sump Hx RR Pp seals and motor oil coolers Loop 2: SDC Hx Loop 3: The others SDC Pp Bearing Coolers RWCU - NRHx, Main PP Oil Hx, Aux Pp Seal Cooler Hx RBEDT Hx Fuel Pool Hx Pumpback Ac
What provides cooling to the U2 Pump Back Air Compressors? U3?
U2 RBCCW PROVIDES COOLING TO BOTH UNIT PUMPBACK AC
What is used to maintain NPSH for the RBCCW Pps?
RBCCW Expansion Tank
Where is the RBCCW Expansion Tank? What is it’s purpose?
RB 570 -
Allows for volume expansion and contration
Make-up and Overflow
System leak detection
What provides make-up to RBCCW and where is it added in the system flow?
Make-up to Expansion tank via Clean demin transfer pump via auto AOV
What interlocks are associated with the RBCCW Expansion Tank?
Head Tank Hi/Lo Level ALARM ONLY - No Trips
Where does the RBCCW Expansion Tank Drain to? Why?
RBFDS - to keep chemicals out of Waste Collector Tank - Equipment drains
How many RBCCW Hx are there? How many per unit? How many are physically located in U2?U3?
5 Total
2 per unit and 1 swing.
3 are located on U2 side
2 on U3 side
How is the RBCCW Water Temp Controlled?
Cooling Service Water flow controlled via TCV that is connected to Temp element on RBCCW water outlet of Hx
How many RBCCW SW TCVs are there and where are they in the system?
There is one TCV per Hx, located near SW inlet to Hx. TE located at RBCCW outlet
If 2 RBCCW Pumps are running, how many Hx must be in service?
2:
On each unit, there must be the same number of Hx and pumps in service.
If more Hx than pumps then pump load would approach runout
If More Pps thant Hx, then flow would exceed design capability of Hx and have excessive vibrations
How many RBCCW Pps are there and what are their power sources?
5:
2(3)A - 23-1(33-1)
2(3)B - 24-1(34-1)
2/3 - Either 24-1 or 34-1
What is the rated capacity of the RBCCW Pps and the min flow?
Each Rated for 8800gpm at 80psig w/ 50% capacity.
Min flow is 900gpm
