ML20052G739
| ML20052G739 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/10/1982 |
| From: | PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| Shared Package | |
| ML20052G723 | List: |
| References | |
| NUDOCS 8205180622 | |
| Download: ML20052G739 (4) | |
Text
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TABLE 3.2.B (CONTINUED)
{C INSTPUMENTATION THAT INITIATES OF CONTPOLS THE CORE AND CONTAINMENT g
COOLING SYSTEMS CEI y
Minimum No.
g Of Operable Number of Instru-Ir.atrument Trip Function Trip Level Setting ment Channels Pro-Remarks Q
Channels Per vided by Design Trip System (1) 4(5)
HPCI Steam Line 100)p>50 psig (3) 4 Inst.
U Low Pressure
~2 HPCI Turbine
$200 deg.F (3) 4 Inst.)
4 Compartment
)
Temperature
)
1 4
HPCI Steam Line
<200 deg.F (3) 8 Inst.) 16 Inst.
Area Temperature
)
)
2 HPCI/RHR Valve 1200deg.F (3) 4 Inst.)
Station Area Temperature 1 per 4kV 4KV Emergency Bus 25t(15%)of Rated
- 1. Trips all loaded breakers Bus Undervoltage Relay Voltage
- 2. Fast transfer permissive.
- 3. Dead bus start of diesel, e
1 per 4KV 4KV Emergency Bus 95t(+04,-10tlof Permits sequential j
Bus Sequential Loading Rated Voltage starting of vital loads Relay 2 per 4KV Emergency 60t( 54)of Rated
- 1. Trips emergency transformer Bus Transformer Voltage feed to 4KV emergency bus Undervoltage
- 2. Fast transfer permissive 1
LPCI Cross-Connect NA 1 Inst.
Initiates annunciation Position when valve is not closed 2 per 4 KV Emergency Trans-904(12%) of Bus former Degraded Rated voltage voltage (Instantaneous) 60 second I. Trips emergency transformer
( 54) time delay.
feed to 4 KV sergency bus
- 2. Fast transfer permissive.
6 second(25%)
- 1. Trips emergency trans-time delay.
former feed to 4 KV emergency bus.
- 2. Fast transfer permissive
- 3. Safety injection signal required.
2 per 4 KV Emergency Trans-87t(15%) of
- 1. Trips emergency trans-Bus former Degraded Rated Voltage former feed to 4 KV voltage (Inverse emergency bus.
time - voltage).
- 2. Fast transfer permissive
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TA" LE 4.2.B MINIMUM TEST AND CALIBRATION FREQUENCY FOR CSCS Instrument Channel Instrument Functional Test Calibration Frequency Instrument Check 1)
Beactor Water (1) (3)
Once/ operating cycle Once/ day Level (7) 2).
Drywell Pressure (1) (3)
Once/ operating cycle Once/ day (7) 3)
Reactor Pressure (1) (3)
Once/ operating cycle Once/ day (7) 4)
Auto Sequencing NA Once/ operating cycle None Timers 5)
Once/3 months None Pump Disch. Pressure a
Interlocks 6)
Trip System Bus (1)
NA None Power Monitors 7)
Core Spray (1)
Once/6 months Once/ day Sparger d/p e
8)
Steam Line High (1)
Once/3 months None 3
- 9) Steam Line High (1) (3)
Once/ operating cycle Once/ day Temp. (HPCI & RCIC)
- 10) Safeguards Area (1)
Once/3 months None High Temp.
- 11) HPCI and PCIC (1)
Once/3 months None Steam Line L./
Pressure
- 12) HPCI Suction Source (1)
Once/3 ronths None Levels 4
_m.
4 TABLE 4.3.B (CONTINUED)
MKNZMDM TESP AND CALYBRATION FREQUENCY FOR CSCS Instrument Channel Instrument Functional Test Calibration Frequency Instrument Check
- 13) 4KV Emergency Power Once/ operating cycle Once/5 years None Systese - Voltage Relays
- 15) LPCI/ Cross. Connect' Once/ refueling cycle N/A N/A
. Valve Position j
- 16) 4KV Emergency Power Once/ operating cycle Once/ operating cycle None Source Degraded Voltage nelays.
i k
k l
I i
1 d
1 i
~
l PBAPS
- 3. 2 B ASE S (Cont 'd )
In the event of a loss of the reactor building ventilation system, radiant heating in the vicinity of the main steam lines raises the ambient temperature above 200 degrees F.
Restoration of the main steam line tunnel ventilation flow momentarily exposes the temperature sensors to high gas temperatures.
The momentary temperature increase can cause an unnecessary main steam line isolation and reactor scram.
Permission is provided to increase the temperature trip setpoint to 250 degrees F for 30 minutes during restoration of ventilation system to avoid an unnecessary plant transient.
The Emergency Aux. Power Source Degraded Voltage trip function prevents damage to safety related equipment in the event of a sustained period of low voltage.
The voltage supply to each of the 4kV buses will be monitored by undervoltage relaying.
With a degraded voltage condition on the offsite sources the undervoltage sensing relays operate to initiate a timing sequence.
The timing sequence provides constant and inverse time voltage characteristics.
Degraded voltage protection includes: (1) a 60 second time delay relay initiated at 90% voltage; (2) a 6 second time delay relay initiated at 90% voltage which requires presence of a Safety Injection Signal to initiate transfer and; (3) an inverse time voltage relay initiated at 87% voltage with a maximum 60 second delay.
When the timing sequence is completed, the corresponding 4kV emergency circuit breakers are tripped and the emergency buses are transferred to the alternate source.
The sixty second timing sequences were selected to prevent unnecessary transfers during mator starts and to allow the automatic tapchanger on the startup transformer to respond to the voltage condition.
The six second timing sequence is necessary to prevent separation of the emergency buses from the offsite source during motor starting transients; yet still be contained within the time envelope in FSAR Table 8.5.1
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