ML20024D140
| ML20024D140 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/29/1983 |
| From: | PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| Shared Package | |
| ML20024D125 | List: |
| References | |
| NUDOCS 8308030199 | |
| Download: ML20024D140 (6) | |
Text
.
. 8308030199'830729 PDR ADOCK 05000277 P
PDR TABLE 3.2.B (CONTINUED)
INSTRUMENTATION THAT INITIATES OR CONTROLS THE CORE AND CONTAINMENT COOLING SYSTEMS Minimum No.
Number of Of Operable Instrument Instrument Trip Function Trip Level Setting Channels Remarks Channels Per Provided by Trip System (1)
Design 4(5)
HPCI Steam Line 100>p>50 psig (3) 4 Inst.
Low Pressure 2
HPCI Turbine
~<200 deg.F (3) 4 Inst.)
Compartment
)
Temperature
)
)
4 HPCI Steam it. ire
~<200 deg.F (3) 8 Inst.) 16 Inst.
Area Temper
- Mte
)
)
0
)
I 2
HPCI/RHR V4cso
~<200 deg.F (3) 4 Inst.)
Station Area l
Temperature 1
LPCI Cross-Connect NA 1 Inst.
Initiates annun-Position ciation when valve is not closed.
4 1 per 4kV 4KV Emergency Bus 25%(+5%)of Rated
- 1. Trips all loaded Bus Undervoltage Relay Voltage breakers.
(HGA)
- 2. Fast transfer
_ permissive.
- 3. Dead bus start of diesel.
1 per 4KV 4KV Emergency Bus 95%(+0%,-10%)of Permits sequential l
Bus Sequential Loading Rated Voltage starting of Relay (SV) vital loads I
o
d TABLE 3.2.B (CONTINUED)
INSTRUMENTATION THAT INITIATES OR CONTROLS THE CORE AND CONTAINMENT COOLING SYSTEMS Minimum No.
Number of Of Operable Instrument Instrument Trip Function Trip Level Setting Channels Remarks Channals Per Provided by Trip System (1)
Design i
2 par 4 KV Emergency 60%(+5%)of Rated
- 1. Trips emergency Bus Transformer Voltage. Test at transfer feed Undervoltage(IAV) zero volts in 1.8 to 4KV emer-(Inverse time-seconds (+10%).
gency bus.
voltage)
- 2. Fast transfer permissive.
2 par 4 KV Emergency Trans-90%(+2%) of Bus former Degraded raEed voltage voltage (ITE)
(Instantaneous) 1 60 second
- 1. Trips emergency y
(+5%) time delay.
transformer feed i
to 4 KV emergency bus.
- 2. Fast transfer permissive.
6 second(+5%)
- 1. Trips emergency time deTay.
transformer feed to 4 KV emer-gency bus.
- 2. Fast transfer permissive.
- 3. Safety injec-tion signal required.
o
TABLE 3.2.B (CONTINUED)
INSTRUMENTATION THAT INITIATES OR CONTROLS THE CORE AND CONTAINMENT COOLING SYSTEMS Minimum No.
Number of Of Operable Instrument Instrument Trip Function Trip Level Setting Channels Remarks Channels Per Provided by Trip System (1)
Design 2 per 4 KV Emergency Trans-R7%(+5%) of
- 1. Trips emergency Bus former Degraded Rated Voltage.
transformer feed voltage (Inverse Tests at 2440 to 4 KV emer-time - voltage).
volts in 30 seconds gency bus.
(CV-6)
(+10%)
- 2. Fast transfer
~
permissive.
b rr i
I f
a 5
e TABLE 4.2.B MINIMUM TEST AND CALIBRATION FREQUENCY FOR CSCS Instrument Channel Instrument Functional Test Calibration Frequency Instrument Check 1)
Reactor 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 Interlocks h6)
Trip System Bus (1)
NA None Power Monitors 3
7)
Core Spray (1)
Once/6 months Once/ day Sparger d/p 8)
Steam Line High (1)
Once/3 months None Flow (HPCI & RCIC) 9)
Steam Line High (1) (3)
Once/ operating cycle Once/ day Temp. (HPCI & RCIC) 10)
Safeguards Area (1)
Once/3 months None Hi gh Temp.
Once/3 months None Steam Line Low Pressure n
TABLE 4.2.B (CONTINUED) l MINIMUM TEST AND CALIBRATION FREQUENCY FOR CSCS Instrument Channel
-Instrument Functional Test Calibration Frequency Instrument Check
- 12) HPCI Suction Source (1)
Once/3 months None Levels
- 15) LPCI/ Cross Connect Once/ refueling cycle N/A N/A Valve Position
- 16) 4KV Emergency Power Once/ month once/ operating cycle None' i
Source Degraded Voltage Relays 3,
(IAV,CV-6,ITE)
I n
PBAPS 3.2 BASES (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 undervaltage relaying.
With a degraded voltage condition on the offsite source the undervoltage sensing relays operate to initiate a timing sequence.
The timing sequence provides constant and inverse time voltage n
characteristics.
Degraded voltage protection includes: (1) An x
instantaneous relay (ITE) initiated at 90% voltage which initiates a 60-second time delay relay and a 6 second time delay relay.
The 6 second time, delay relay requires the presence of a Safety Injection Signal to initiate transfer; (2) An inverse time voltage relay (CV-6) initiated at 87% voltage with a maximum 60 second delay and operates at 70% voltage in 30 seconds; and (3)
An inverse time voltage relay (IAV) initiated at approximately 60% voltage and operates at 1.8 seconds at zero volts.
When the timing sequence is completed, the corresponding 4kV emergency circuit breakers are tripped and the emergency buses are transferred to the alternate source.
Ste sixty second timing sequences were selected to prevent unnecessary transfers during motor starts and to allow the automatic tapchanger on the startup transformer to respond to the voltage condition.
The six sccond 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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