- OT ΔT (C-3) *
- 3% below Trip Setpoint
- 2/4
- OP ΔT (C-4) *
- 1% below Trip Setpoint
- 2/4
- * Pulsed runback @ 200% per minute:
- ON for 1.5 seconds
- OFF for 28.5 seconds
- LCV-6-105A or 105B off the closed seat **
- Turbine load > 81% (Unit 1) or 82% (Unit 2) **
- #3 HDTP discharge flow <5500 gpm for > 10 sec **
- ** Runback will continue @ 200% per minute, via governor valve position limiter, until:
- turbine load is < 77%
- OR
- LCV-6-105A & 105B are closed
- OR
- #3 HDTP discharge flow is > 5500 gpm
- Tripped with turbine load > 76% (Unit 1) or 77% (Unit 2) ***
- 1/1
- *** Runback will continue @ 200% per minute, via governor valve position limiter, until:
- From P-4 Contacts
- 1/2 Trains
- SIS (K621 input)
- 1/2 Trains
- SIS signals
- Containment Press Hi
- 1.54 psid
- 2/3 PTs
- No Block/Permissive
- Pressurizer Press. Low
- 1870 psig
- 2/3 PTs
- Manual Below P-11
- Steamline Press Low
- 600 psig
- 2/3 PTs on 1/4 loops
- Manual Below P-11
- Manual
- Between sum of Mechanical Overspeed Test + 10 rpm and 1999 rpm
- 1/1
- Between 1940 rpm and 1989 rpm
- 1/1
- Low ΔP across Stator
- 12 psid less than normal
- 2/3
- Stator Outlet Temp
- Permissives (both)
- 45 sec. time delay
- Gen. amps >15%
- > 14 mils
- Alarm @ > 7 mils
- Manual
- Operator response required
- Reverse Power (32X)
- Gen. Backup (86GBX)
- Neg. Phase Sequence (46X)
- Overcurrent (51GX)
- System Ground (51/59X)
- Differential (87X)
- Differential (87TX)
- Differential (87TX)
- 2/3 (on 1/3 transformers)
- Unit 1 only
- Differential (A87SX)
- Differential (B87SX)
- < 8% S/G Level
- > 40% power (as seen by main turbine)
- 2/2
- 360 second time delay dropout for this interlock
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