ML19321B189
| ML19321B189 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 07/31/1980 |
| From: | NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML19321B188 | List: |
| References | |
| NUDOCS 8007280582 | |
| Download: ML19321B189 (9) | |
Text
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DOCKET NO. 50-245 s
ATTACliMENT MILLSTONE NUCLEAR POWER STATION, UNIT NO. 1 PROPOSED TECllNICAL SPECIFICATION CllANGES FOR STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES r
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l JULY, 1980 8007280 D F 2__
TABLE 3.2.2 (Continued)
INSTRUMENTATION THAT INITIATES AND CONTROLS THE EMERGENCY CORE COOLING SYSTEMS Minimum Number of Operable Inst. Channels Trip Function Trip Level Setting Remarks P;r Trip System (1) 1 Timer Auto Blowdown
-< 120 seconds 1 - In conjunction with low low reactor water level and high drywell pressure and LP core cooling pump interlock.
2 Containment Spray 4.5 i P1 5.5 Psig 1 - Prevent inadvertent operation of Interlock containment spray.
2 APR LP Core Cooling 90 < P < 110 Psig 1 - Defer APR actuation pending confirma-Pump Interlock tfon of LP core cooling system operation.
2 sets of 2 Power Available on Normal for 120 Volt 1 - Permissive for auto-close of emergency (Total)
Emergency Buses undervoltage relays power source on buses.
(Monitor Buses 5 and 6) 2 - Permissive to start core spray and LPCI pumps.
2 sets of 7 for Loss of Normal Power 82 Volts (11%) Secondary.
1 - Initiates start of emergency power bree!:er pasi'. ion (Level 1)
Corresponds to 246 kv (71%)
sources.
logic in the switchyard. Time OR_
delay is 6.0 sec. at 50%
2 - Strip loads from buses.
1 out of 2 Level 1 of rated voltage (345 kv).
Relays with flSST-1 3 - Permissive for emergency power sources out of service.
to close on buses.
1(2)
Degraded Voltage 112 Volts (15V) Secondary.
1 - Initiates start of emergency power (Level 2)
Corresponds to 336 KV (97%)
sources.
Coincident with in the switchyard. Time ECCS initiation.
delay is 1.0 sec.
2 - Strip loads from buses.
3 - Permissive for emergency power sources to close on buses.
(1) If the first column cannot be met for one of the trip systems, that system may be tripped.
If the first column cannot be met for both trip systems, immediately initiate an orderly shutdown to cold conditions.
(2) Normal scheme uses redundant sets of degraded voltage relays. Two out of two channels in either set must operate to initiate a degraded voltage signal. One channel may, at times, be bypassea, leaving a one-out-of-one logic for degraded voltage sensing.
3/4 2-4
TABLE 4.2.1 Decemb:r 4,1978 r
MINIMUM TEST AND CALIBRATION FREQUENCY FOR CORE COOLING INSTRUMENTATION R0D BL1CKS AND ISOLATIONS Instrui.;ent Channel Instrument Functional Test (2)
Cal i bration Instrument Check (2)
ECCS Instrumentation 1.
Reactor Low-Low Water Level (1 )
Once/3 Months 2.
Drywell High Pressure (1.)
Once/3 Months 3.
Reactor Low Pressure (Pump Start)
(1 )
Once/3 rionths 4.
Reactor Low Pressure (Valve Permissive)
(1)
Once/3 Months 5.
APR LP Core Cooling Pump Interlock (1 )
Once/3 !1onths 6.
Containment Spray Interlock (1 )
Once/3 flonths 7.
Loss of Normal Power Relays Refueling Outage Refueling Outage l
8.
Power Available Relays (1 )
(5)
None 9.
Reactor High Pressure Once/3 fionths 10.
Degraded Voltage Refueling Outage Refueling Outage l
Rod Blocks 1.
APfil Downscale (1)
(3)
Once/3 Months (1) 2.
A?Rf1 21ow Variab'.e (1 )
(3)
Once/3 Months (1 )
3.
IU Upscale (6)
(6)
(6) 4
.1v ))vnscale (6)
(6)
(6) 5.
RSM Upscale (1 )
(3)
Once/3 Itonths (1) 6.
RBM Downscale (1 )
(3)
Once/3 Months (1) 7.
SRM Upscale (6)
(6)
(6) 8.
SRM Detector not in Startup Position (6)
(6)
(6)
Main Steam Line Isolation 1.
Steam Tunnel High Temperature Refueling Outage Refueling Outage 2.
Steam Line High Flow (1 )
Once/3 Months Once/Da, 3.
Steam Line Low Pressure (1)
(3)
Refueling Outage Nor 4.
Steam Line High Radiation (1 )
(3)
Once/3 Months (4)
Once/ Day 3/4 2-6 Amendment No. 3A
e LIMITING CONDITION FOR OPERATION I
SURVEILLANCE REQUIREMENT t
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3.9 AUXILIARY ELECTRICAL SYSTEM 4.9 AUXILIARv ELECTRICAL SYSTEM I
Appl ica bil i ty -
Appl ica bil i ty:
Applies to the auxiliary electrical power system.
Applies to the periodic testing requirements of the auxiliary electrical system.
Objective:
Objective:
To assure an adequate supply of electrical power during plant operation.
Verify the operability of the auxiliary electrical system.
Specification:
I Specification:
A.
The reactor shall not be made critical unless all of the following conditions are satisfied-A.
Emergency Power Sources i
1.
One 345 kv line, associated switchgear, and i
1.
Diesel Generator auxiliary startup transformer capable of automatically supplying ~ auxiliary power.
j a.
The diesel generator shall be started and loaded once a month te uemonstrate 2.
Both emergency power sources are operable.
i operational readiness.
The test shall continue until the diesel engine and 3.
An additional source of power consisting of the generator are at equilibrium one of the following:
temperature at full load output.
During this test, the diesel starting l
a.
The 23 kv line, associated switch-air compressor will be checked for gear, shutdown transformer to supply operation and its ability to re-power to the emergency 4160 volt buses.
charge air receivers.
b.
One 345 kv line fully operational and b.
During each refueling outage, the capable of carrying auxiliary power conditions under which the diesel to the emergency buses.
generator is required will be simu-lated and test conducted to demon-4.
a.
4160 volt Luses five and six are strate that it will start and be l
energized Q 3646 volts) and the ready to accept load within 13 associated 480 volt buses are s eco nds. This test will demonstrate energized.
the sequence of Class lE bus de-energization, load shedding, voltage restoration, and load sequencing.
Additionally, the degraded voltage /
loss-of-normal power trip system will be demonstrated.
3/4 9-1
.4 LIMITING CONDITION FOR OPERATION SURVEILLANCE REQUIREFiENT -
9 5.
All station and switchyard 24 and 125 volt c.
During the monthly generator test, batteries and associated battery chargers i
the diesel fuel oil transfer pumps are operable.
l shall be operated.
i B.
When the mode switch is in Run, the availability 2.
Gas Turbine Generator of power shall be as specified in 3.9.A, except as specified below:
a.
The gas turbine generator shall be fast started and the output breakers 1.
From and after the date that incoming power closed within 48 seconds once a month is available from only one 345 kv line, to demonstrate operational readiness.
reactor operation is permissible only during The test shall continue until the the succeeding seven days unless an addi-i gas turbine and generator are at
. tional 345 kv line is sooner placed in equilibrium temperature at full load
- service, output. Use of this unit to supply I
power to the system electrical net-2.
From and after the date that incoming power work shall constitute an acceptable is not available from any 345 kv line, demonstration of operability.
reactor operation shall be permitted pro-i vided both emergency power sources are b.
During each refueling outage, the ope rating and the isolation condenser system conditions under which the gas turbine-l is operabl e.
The NRC shall be notified, generator is required will be simulated within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the precautions to be and a test conducted to verify that it talen during this situation and the plans will start and be able to accept for restoration of incoming power.
The emergency loads within 48 seconds, minimum fuel supply for the gas turbine This test will demonstrate the sequence during this situation shall be maintained of Class lE bus de-energization, load above 20,000 gallons.
shedding, voltage restoration, and load sequencing. Additionally, the 3.
From and after the date that either emer-degraded vol tage/ loss-of-normal power gency power source or its associated bus is trip system will be demonstrated.
made or found to be inoperable for any reason, reactor operation is permissible B.
Batt( ies according to Specification 3.5.F/4.5F unless such emergency power source and its bus 1.
Station Batteries are sooner made operable, provided that during such time two offsite lines (345 a.
Every week, the specific gravity and l
or 23 kv) are operable.
voltage of the pilot cell and tempera-ture of adjacent cells and overall battery voltage shall be measured.
Amendment No. 77, 37 3/49-2
e LlMITIfiG CONDlTION FOR OPERATION l
SURVEZLLANCE REQUIREMENT b.
Every three months, the measure-ments shall be made of voltage of each cell to nearest 0.01 volt, i
specific gravity of each cell and l
temperature of every fifth cell.
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3/4 9-2a
LlMlTING CONDIT!0N FOR OPERATION l
~ SURVEILLANCE REQUIREMENT l,
4.
From and-after the date that one of the c.
At every refueling outage or at two 125 volt or 24 volt battery systems if a
18 month intervals, the station made orf found to be inoperable for any battery shall be subjected to a reason reactor operation is permissible:
performance test in accordance with l
only during the succeeding seven days the procedures described in Section unless such battery system is sooner made~
5.4 in IEEE Standard 450-1972, opera bl e.
I "IEEE Recommended Practice for Maintenance, Testing, and Replace-C..
Diesel ' and Gas Turbine Fuel ment of Large Stationary Type Power Plant and Substation Lead Storage There shall be a minimum of 20,000 gallons of Batteries".
diesel fuel supply onsite for the diesel and a minimum of 35,000 gallons onsite for the gas 2.
Switchyard Batteries turbine, except as permitted in Specification i
l 3.9.B.2.
a.
Every week, the specific gravity and voltage of the pilot cell and temperature of adjacent cells and overall battery voltage shall be mea sured.
j b.
Every three months, the measurements shall be made of voltage of each i
i cell to nearest 0.01 volt, specific i
gravity of each cell, and temperature l
of every fifth cell.
C.
The quantity of gas turbine generator and diesel generator fuel shall be logged weekly and after cich operation of the unit.
Once a month, a sample of the,iesel and gas l
turbine fuel shall be taken from the under-ground storage tanks and checked for quality.
D.
During each refueling outage, the setpoint of i
each of the degraded voltage sensors shall be verified.
The setpoint shall correspond to an offsite source voltage of 336 kv.
3/49-3 1
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3.9 Bases
A.
The objective of the auxiliary electric power availability specification is to assure that adequate power will be available to operate the emergency safeguards equipment. Adequate power can be provided by any one of the following power sources: either of the two lines of the 345 kv system, the 23 kv system, the gas turbine-generator, and the diesel generator.
This specification assures that at lea'st two offsite and two onsite power sources will be available before the reactor is started up.
In addition to assuring power source operability, all of the associated switch-gear'and vital equipment must be operable as specified to assure that the emergency cooling equipment can be operated, if required, from the power sources.
Operating with less than 3646 volts on the 4160-volt electrical system may endanger equipments or systems at the 480-volt level.
The limiting voltage for 4160-volt equipment is 3620 volts.
B.
Normally both 345 kv lines will be available to provide emergency power to the plant when the reactor is operating.
However, adequate power is available with one of the two 345 kv lines out of service.
Therefore, reactor operation is permitted for up to seven days with one of the two 345 kv lines out of service to accommodate necessary maintenance, etc.
In the event that both 345 kv lines are out of service, continued reactor operation is permitted provided both onsite emergency power sources are operating with an adequate fuel supply.
Two operational power sn'rces provide an adequate assurance of emergency power availability under these circumstances.
In addition,
- 1e iso ^at on condenser system is required to be operable as a standby heat removal system.
Ilormally, both the gas turbine-generator and diesel generator are required to be operable to assure adequate e.rerJEncy power with no offsite power sources.
However, due.o the redundancy and reliability of offsite power, one of the two emergency onsite power sources may be out of service for limited periods of time pro-viding two offsit-power sources are available during these periods.
C.
Either of the twc station batteries has enough capability to energize the vital buses and power the other emergency equipment.
Due to the high reliability of batt ery systens,-nne of the two batteries may be out of service for up to 7 days.
This minimizes the probability of unwarranted shutdowns by providing adequate time for reasonable repairs.
D.
The diesel fuel supply of 20,000 gallons will supply the diesel generator witn about five days of full load operation.
The gas turbine generator fuel supply of 35,000 gallons is sufficient to operate the unit for at least two and one-half days considering the fuel consumption vs. load and load vs. time requirements during the postulated accident.
Reference Amendment 18.
Additional fuel can be supplied to the site within twelve hours.
B 3/4 9-1
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4.9 Bases
A.
The monthly test of the diesel generator and gas turbine generator is conducted to check for equipment failures and deterioration. Testing is conducted up to equilibrium operating conditions to demonstrate proper operation at these conditions.
Operation of the gas turbine generator for peaking purposes may substitute for the monthly performance check. The units will be manually started, synchronized to the bus and load picked up.
Generator experience at other generating stations indicates that the testing frequency is adequate to assure a high reliability of operation should the system be required.
In addition, during the test when the generator is synchronized to the bus, it is also synchronized to the off-site power source and thus, not completely independent of this source. To maintain the maximum amount of independence, a thirty-day testing interval is also desirable.
Both the diesel generator and the gas turbine generator have air compressors and air receiver tanks for starting.
It is expected that the air compressors will run only infrequently.
During the monthly check of the units, the receivers will be drawn down below the point at which the compressor automatically starts to check operation and the ability of the compressors to recharge the receivers.
Pressure indicators are provided on each of the receivers.
Following the tests or peaking operation of the units and at least weekly, the fuel vclume remaining will be checked.
At the end of the monthly load test of the diesel generator, the fuel oil transfer pump will be operated to refill the day tank and to check the operation of this pump.
Peaking operation shall be controlled so that major maintenance operations on the gas turbine will not be scheduled during an operating cycle.
The test of the diesel and gas turbine generators during the refueling outage will be more comprehensive in that it will functionally test the system; i.e., it will check starting and closure of breakers and sequencing of loads.
The units will be started by simulation of a loss of coolant accident.
In addition, a loss of normal power condition will be imposed to simulate a loss of off-site power.
Operation of the degraded voltage / loss-of-normal power scheme will be checked.
The timing sequence will be checked to assure proper loading in the time required.
Periodic tests between refueling outages check the capability of the units to run at full load.
Periodic testing of the various components plus a functional test at a refueling interval are sufficient to maintain adequate reliability.
B.
Although the station and switchyard batteries will gradually deteriorate with time, the surveillance specified is that which will provide an indication of all degradation long before the battery would have insufficient capacity to meet the design load which could be placed upon it.
Battery cell replacements will be made in accordance with Section 6 of IEEE Standard 450-1972, " Battery Replacement Criteria".
C.
Logging the diesel and gas turbine generator fuel supply weekly and after each operation assures that the minimum fuel supply requirements will be maintained.
D.
Verifying the ~ degraded voltage setpoint will assure that the p eferred offsite power supply (RSST) is tripped, under accident conditions, at that value of degraded voltage where safeguards actions can no longer be assured due to low offsite voltage.
B 3/4 9-2
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