BDS(H3) - Steam Generator Blowdown
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18 Terms
Simplified Diagram
Normal Flow rate?
EDI Discharge?
EDI Brine Discharge?
9.3 - 93gpm per SG
EDI discharge to Shell A (Manual to WWS if high impure, Auto divert to WLS via V022 High Rad)
Brine discharge to WWS
Wet Layup
Maintains: pH and dissolved Oxygen
CFS injects controlling chemicals
200gpm Total flow via BDS Recirc Pump (Turbine Building)
*Low flow pump trip: 57gpm (Local manual flow throttle)
Plant Startup
BDS Operations
Operated at Maximum flow rate (186: 93/SG):
Improved Chemistry Control
More SG Level demand for better SFCV control
BDS PMS Signals
Isolations
SGNR 21% (RESPECTIVE)
PRHR Actuation
Containment Isolation “T”
Isolate: V074A/B & V075A/B
PLS will also close BDS-V005A/B
BDS
Hx Outlet Isolation AOVs
(BDS-V005A/B)
BDS
SG Blowdown FCVs
(BDS-V006A/B)
BDS
Signals that will isolate ALL BDS valves
(BDS-V005/6A/B)
100psg High
5E-4 MCi High
123.5” DST High
“T” (PMS sends signal to PLS)
PRHR Actuation (PMS sends signal to PLS)
BDS
Signals that will isolate only RESPECTIVE train BDS valves
(BDS-V005/6A/B)
135F High (150F if EDI is isolated)
103gpm High (150gpm if EDI is isolated *Turbine Bldg Concrete Concern)
390F High Condensate Temp
55gpm Low Condensate Flow
21% SGNR
*The V006s have an additional signal that will isolate them if it’s respective isolation (V005) is closed
BDS
FCV Bypass
(V011A/B)
V006s have Local Manual bypass valve:
Tubesheet flushing
Upset Chemistry
Plant Heatup
(Available to manually throttle if V006 failure)
BDS
EDI Product PCV (BDS-V050)
Maintains 40psig backpressure (Used to place V006s in service after restoration)
Handwheel available for local operation
Fails CLOSED (Maintain SG inventory)
BDS
EDI Product Divert
(BDS-V022)
Auto diverts EDI product to WLS if
2E-7 High Rad
Fails: To WLS (Waste Holdup Tanks)
BDS
EDI Reject Pressure Regulator
V051
BDS
EDI Reject Divert AOV
V055
Main Condenser Supply PCV
(BDS-V035)
Fails OPEN, Manual Handwheel for local operation
Maintains 5psig backpressure to prevent BDS lines from flashing due to connection to Condenser vacuum
More Detailed
Hx Outlet Temperature
Blowdown Flow
Upset Chemistry
SG Draining
