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24 Cards in this Set
- Front
- Back
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What is the purpose of the containment building?
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WITHSTAND THE PRESSURE & TEMPERATURE TRANSIENTS CALCULATED TO EXIST AFTER A DESIGN BASIS ACCIDENT
CONFINES RADIOACTIVE MATERIALS THAT COULD BE RELEASED BY LOSS OF INTEGRITY OF THE RCS BOUNDARY |
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What is the maximum pressure that the containment vessel can withstand?
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44 psig
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What is the maximum temperature that the containment vessel can withstand?
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263F
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What is the free volume of the containment vessel?
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2,680,000 cubic feet
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What are the three functions of the Primary Shield Wall?
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Biological shield during normal operation.
Missile shield during accidents to protect the reactor vessel. Supports the reactor vessel (reactor cold legs supported by a ring girder) |
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What type of pressure is maintained on the annulus of the containment building? Why?
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Negative,Pressure will attempt to increase after a LOCA due to thermal energy transfer from the containment vessel (will be maintained in a vacuum by Shield Building ventilation system).
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What is a Type I piping penetration?
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Hot Piping. Must accommodate the associated thermal movements, thermal, seismic, rupture and impingement loads without imposing undue stress on the steel containment wall or int he piping system.
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What is a Type II piping penetration?
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Penetrations for general piping. Subject to relatively low temperature and pressure.
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What is a Type III piping penetration?
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Moderate temperature and pressure. Penetrations where there is a possibility of over pressurizing the annulus.
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What are type IV and V penetrations?
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Moderate temperature and pressure within the containment mat structure and prevent the emptying of containment of recirculation water during and after a LOCA.
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What is the set point for the containment vacuum relief system?
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8.50" wg annulus above containment - opens valve
10" wg Backup open signal A Check valve - opens with 2.5" wg differential |
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What is the design capacity of the Containment Heat Removal System?
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Remove 234 million BTU/hr steam-air mix at 269F,44 psig, and 100 percent relative humidity.
Reduces pressure by a factor of two from its post-accident peak within 24 hours, resulting in lower containment leakage rates & lower offsite dose rates. Assumes CCW inlet of 115F. |
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What is the purpose of a CIAS?
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Closes all automatic isolation valves in the lines penetrating the containment not required for the operation of the engineered safety features systems except for the component cooling water penetrations servicing the reactor coolant pumps & CEDM coolers which automatically close on a CSAS
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What causes a CIAS?
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high containment pressure
(17.1 psia) low Pressurizer pressure (1684 psia) |
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What pressure and temperature do the steam generator blowdown flow control valves reduce pressure to?
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From 920 psig to 50 psig.
From 506 F to 280 F |
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What is the temperature and pressure limit for the blowdown mixed bed demineralizer inlet?
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100 psig
120 F |
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Where is blowdown normally routed to when clean?
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Condeser A or AFW.
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What is the setpoing for the full flow bypass valve for the blowdown demineralizer? (BD-336)
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140 F
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What is BD-303?
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Blowdown isolation to CW and Pond
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What is the blowdown flash tank pressure relief valve settings?
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50 psig
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Where does the Blowdown Flash Tank Reliefs lift to?
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BD-116 relieves to the west side dry cooling tower (A) area near the FOST. The other relieves to room atmosphere.
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What pressure and temperature does BD-109A and BD-109B (Blowdown flow control valves) close
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59.25" in blowdown flash tank
44 psig and rising in the blowdown flash tank. |
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What is the power supply to the blowdown booster pump?
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213A
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What is BD-1251 and how does it affect the blowdown pumps?
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BD-1251 is the booster pump bypass valve. If open the pumps trip on 0" in the flash tank. If closed the pumps trip on the booster pump.
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