ML17341B580
| ML17341B580 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 01/03/1983 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | Varga S Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17341B581 | List: |
| References | |
| L-83-1, NUDOCS 8301110499 | |
| Download: ML17341B580 (8) | |
Text
y REGULATORY I'alRNATION DISTRIBUTION SYS4I (RIBS)
V ACCESSION NBR:8301110499 DOC ~ DATE; 83/01/03 NOTARIZED!
NO DOCKET FACIL:50>>?50 Turkey Point 'Plantg "Uni.t 3i Florida Power and Light 'C 050002SO
'50 251 Turkey Point Plantg 'Unit 0i Florida Power and Light C
05000251 AUTH BYNAME AUTHOR AFFILIATION UHRI G g'R ~ E ~
Flor ida Power 8 Light Co>
REC IP s NAME RECIPIENT AFFILIATION VARGAiS ~ As Operating Reactors Branch 1
SUBJECT:
Forwards r.esponse to 821028 request for.addi info re degraded grid,protection for Class IE:power sys,'Proposed Tech Specs re 8?1116 application to amend Licenses DPR-31 8
DPR-41 revised, DI'STRIBUTION 'CODE:
A015S COPIES RECEIVED:LTR J. ENCL,~
SIZEi, L/ +5 TITLE:
OR Submittal'.
Onsi:te Emergency Power System NOTES:
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7 1
1 1
1 1
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/I'CSB 09 REG F ILE 04
/MI8 18 COPIES LTTR ENCL 1
1 1
1 1
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>iotors is provided by the 480V relays at the present load center transformer tap settings.
In the future should the load center transformer taps be changed to a value which would not allow such protection, then 4 kV undervoltage relays would be utilized.
The proposed Technical Specifications have been changed to reflect this as well as the required changes in 'the 480 volt undervoltage relay settings (see Attachments 1, 2 and 3).
Relay setpoints are based on approximately 87% of rated motor voltage.
The motors were specified with a 1.15 service factor.
Therefore, they are capable of'operation at this voltage without thermal damage.
For 4kV motors this corresponds to 3480 volts and for 460 volt motors this corresponds to 400 volts at the n~otor terminals.
The actual setpoints take into consideration voltage drops in cable between the motor terminals and the bus on which the r'clay is located.
In addition motor ratings are based on an altitude of 3300 feet above sea level. Since Turkey Point motors are used at 100 feet or less the thermal capability of the motor is increased by 9.7% which would allow continuous operation of the motor at 79.2496 of nameplate voltage (364.5 volts and 3169.6 volts respectively).
Therefore, operation for up to 90 seconds in the range of 364.5 400 volts for 480 volt tilotors and 3170-3480 volts for 4 kV motors poses no.problem.
Considering cable voltage drops to the worst case motor, the following relay times,and relay voltages are given; e uivalent relay voltages relav time motor terminal volts 3605 3176 397.1 60 sec 12 sec 90 sec 20 sec 3600 3170 400 366.5 Short excursions to bus voltages less than those above for less than 20 seconds are also of no concern.
Such short durations of low voltages ar e within the motors'eneral thermal capability, starting/stall times, and lockM..~t-<<
currents which are characterized by an inverse time relationship similar to figures 1 a>>d 2.
MOTOR OPI.'RATED VALVES Motor operated valves employ special torque motors for their operation.
Manufacturer's data and FPL tests reveal that these motors generally operate near or in the saturated region.
That is, with a decrease in voltage the current also decreases.
Therefore, at low voltages there is less temperature rise and
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thermal overheating is not a problem for these valves to,continue.to operate.
CHARGERS According to the manufacturer, the battery chargers can operate at 368 volts with full regulation at a load of 75% or less.
Also should the voltage decrease fur ther,the charger would not suffer any adverse effects or blow fuses although its output would not be within the specific voltage regulation limits.
When voltage returns, the charger output returns to normal.
The Turkey Point chargers are approximately 3096 loaded.
Therefore the chargers <<re not a concern for short periods of low bus voltages.
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