RHR Flashcards
RHR
STATE the four functions of the Residual Heat Removal (RH) System
- Decay and sensible heat removal from the RCS during cooldown < 350 °F
- Serves as the low head portion of ECCS
- Recirculation supply to CCPs/SIPs
- Provides letdown flow to the CS System
- Filling and draining the refueling cavity to/from the RWST
STATE the function of the following RH component: Pumps
• to overcome total head loss of the system in order to provide flow to the RCS
STATE the function of the following RH component: heat exchangers
• Function to cool the RCS from 350 deg F to < 200 deg F
STATE the function of the following RH component: containment recirculation sumps
• The Containment recirculation sumps collect and screen the water available for supplying the RHR, CBS, SI, and Charging pumps during the recirculation mode of ECCS.
STATE the function of the following RH component: RH pump suction and discharge relief valves
- Prevent overpressurization of suction piping
* Discharge to the Pressurizer Relief Tank
DESCRIBE the RH pump mini-flow recirculation flow path and any automatic actions
• Motor operated globe valve prevents pump overheating during low flow or shutoff head conditions, orifice sized for 600 gpm
- Valves will automatically open or close on low flow / high flow from FIS-610 / 611
- Opens @ 750 gpm, closes @ 1403 gpm
- Flow indicators read in CBS pump room
DESCRIBE the function of the RH heat exchanger outlet temperature and flow control valves
• manually controlled from MCB to control cooldown rate
DESCRIBE the function of the primary component cooling water supplied to the RH pump.
Cool mechanical seal of the RHR pumps
DRAW and LABEL the Residual Heat Removal System (RH) including major components and system related flow paths
a. plant cooldown
b. cold leg injection
c. cold leg recirculation
d. hot leg recirculation
