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Drywell Pressure Limit
62 psig
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Drywell Temperature Limit
300oF
*340oF peak from small steam line break150oF req modes 1,2,3
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Suppression Pool Pressure Limits
62 psig, -1.9 Internal
2 psig External
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Operation of Rx building to Torus Vacuum Breakers
air operated valves auto open when RB 0.5 psi > DW pressure
swing check self actuates 1 sec later
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Suppression Chamber to DW Vacuum Breakers
10 valves on ring vent header prevent torus water from being drawn into DW through downcomers and vent pipes post LOCA
- magnet at disc base holds valves shut
- mechanically opens when Torus 0.5 psi > DW
- full open after 1 second
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Drywell Cooler Auto Starts
- Scram - sensed by 60psig in scram air header
- (unless in LOCKOUT)
Dampers open (U2 and 1B only)
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Drywell Cooler Trips
- LOCA - divisionalized from Core Spray logic
- (A,D = div I)
- (B,C = div II)
- Electrical-
- MCC trip on therm or magnetics
- loss of control power (U2 and 1B)
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RCS leakage limits
In modes 1,2,3:
- <5gpm UNIDENTIFIED over past 24 hours
- <25gpm IDENTIFIED
- <2gpm rise in UNIDENTIFIED past 24 (MODE 1)
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LCO 3.6.2.1 Suppression Pool Temperature requirements
In modes 1,2,3:
- <95oF w/no testing in progress
- <105oF w/testing that adds heat
- <110oF CTP<1% rated
- If testing adding heat, stop testing if 105oF
- If 110oF, SCRAM immediate
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Equipment drain recirc
High temp closes discharge valve, opens recirc through cooler.
High level or low temp will isolate from HX and pump forward.
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