ML17298A502
| ML17298A502 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 08/03/1983 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| ANPP-27482-WFQ, NUDOCS 8308090497 | |
| Download: ML17298A502 (11) | |
Text
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'REGULATOR NFORMATION DISTRIBUTION 'S EM
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- AOCESSION, NBR:8308090097..OOO; DATE: 83/Oe/03 NOTARI~ZED:, YES DOCKET e-FACIL'TN.50.528 IPalo Verde Nuclear>> Station~
Un)jt.1i 'Ar )zona -Publ) 05000528 STN 50.529 jPal o Ver de Nucl ear Stat) on<
Un)tt "2i Ar ) zona Publ )
05000529 "STN 50.530 jPal o Ver de Nucl.ear Station~
Unijt>j3i Arizona Pub 1 i* 05000530
'AUTH~ NAME AUTHOR AFFIL'IATION VAN BRUNT<G ~ E ~
Arizona;Public 'Service 'Co..
'REC IP ~NAME, RECIPIENT AFF IL'IATION KNI'GHTONi6 ~
Li censing Branch
>3
SUBJECT:
",Forwards updated response "to.FSAR Question 8A F 16'>>re undervoljtage protectionijto -r ef lect most 'curr erat 'info, on
>>vol tage'idrop,predictions 8 relay settings w/jtime'.~delays. Info will be'"included in future> FSAR -amend.
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Arizona Public Service Company P.O. BOX 2I666
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PHOENIX. ARIZONA 85036 8308090497 830803 PDR ADOCK 05000528,>
', ',, A
.',, PDR,; I August 3, 1983 ANPP-27482 WFQ/KEJ Director of Nuclear Reactor Regulation Attention:
Mr. George Knighton, Chief Licensing Branch No.
3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2 and 3
Docket Nos.
STN-50-528/529/530 Pile:
83-056-026; G.1.01.10
Dear Mr. Knighton:
Please
'find attached an updated response to FSAR question 8A.16 concerning undervoltage protection at PVNGS to reflect the most current information available concerning voltage drop predictions, relay settings with time delays and present design as changed per BTP PSB-1.
This information has been previously discussed with the staff via telecons.
This updated response will be incorporated into a future FSAR amendment.
If you have any questions concerning this matter, please contact me.
Very truly yours, E. E. Van Brunt, Jr.
APS Vice President Nuclear Projects Management ANPP Project Director EEVB/KEJ/sp Attachment cc:
E. Licitra
- 0. Chopra A. C. Gehr (w/a)
A I
K
August 3, 1983 ANPP-27482 WFQ/KEJ STATE OF ARIZONA
)
)
sate COUNTY OF MARICOPA)
I, Edwin E.
Van Brunt, Jr.,
represent that I am Vice President, Nuclear Projects of Arizona Public Service
- Company, that the foregoing document has been signed by me on behalf of Arizona Public Service Company with full authority to do so, that I have read such document and know its
- contents, and that to the best of my knowledge and belief, the statements made therein are true.
Edwin E.
Van Brunt, Jr.
Sworn to before me this~(A dey of 1983
~
Notary Publica<~
My Commission Expires:
My Commlsslon Ejlplres AprH 6, $987
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QUESTION 8A.16 (Letter from R. L. Tedesco of June 17, 1981 on AC Power)
Part 1
Provide the time delay settings for the two 4160 volt safety related bus undervoltage relays.
RESPONSE
The Palo Verde design has four 4160 volt safety related bus induction disc undervoltage
- relays, and four instantaneous undervoltage relays with associated time delay relays.
The induction disc relays have a dropout voltage that varies with time, so that they will commence time out if the voltage falls below 78%
for a long time or below about 70X for a short time (11.4 sec or less) at time dial setting of 4.
And a
tap block setting of 93 volts.
The parallel instantaneous undervoltage relays will commence timeout of the series connected time delay relays when the bus voltage drops to less than 90X of design in a
maximum of 35 seconds.
Recovery of the bus voltage before timeout is completed will reset the timedelay relays for the full 35 seconds.
Part 2
Submit the following information:
the voltage levels at the safety-related buses optimized'or the maximum and minimum load conditions that are expected throughout the anticipated range of voltage variations of the off-site power sourced by appropriate adjustment of the voltage tap settings of the intervening transformers.
The tap settings selected should be based on an analysis of the voltage at the terminals of the Class IE loads.
The analyses performed to determine minimum operating voltages should typically consider maximum unit steady state and transient loads for event such as a unit trip, loss of coolant
- accident, startup or shutdown; with the off-site power supply (grid) at minimum anticipated voltage and only the off-site source being considered available.
Maximum voltages should be analyzed with the off-site power supply (grid) at maximum expected voltage concurrent with minimum unit loads (e.g.
cold
- shutdown, refueling).
~ A separate set of the above analyses should be performed for each available connection to the t
off-site power supply.
I
RESPONSE
The maximum load condition at the minimum anticipated off-site voltage was considered when
- 1) winding "Z" of a start-up transformer was feeding normal train A
loads of Unit 1
while undergoing a trip and train B of Unit 3 was supplying 'accident loads associated with a LOCA, and
- 2) the "Y" winding of the same start~p transformer was supplying normal train ESF loads of Unit 2.
The analysis indicated the following worst-case Class IE per unit voltage levels at 0.95 per unit switchyard voltage:
o 4.16KV Switchgear o
480V Load Center Bus Voltage 0.8350 0.8318 o
480V Motor Control Center 0.8297 Motor Voltage 0.8684 0.8679 0.8658 The steady state per unit voltages with all normally running loads on Unit 1 while supplying one train of accident loads to Unit 3 and normal grid voltage (100X) in the switchyard are:
o 4.16KV Switchgear o
480V Load Center Bus Voltage 1.0108 1.0260 o
480V Motor Control Center 1.0244'otor Voltage 1.0512 1.0707 1.0689 The per unit voltages expected during situations of light loading such as refueling or cold shutdown with maximum grid voltage (105%)
and supplying one train of accident loads to Unit 3 are:
o 4.16 KV Switchgear o
480V Load Center Bus Voltage 1.0697 1.0906 o
480V Motor Control Center 1.0890 Motor Voltage
'.1125 1.1380 1.1363
~ l CI
RESPONSE
PVNGS will measure the station distribution buses including Class IE buses initially, prior to loading and record voltages.
PVNGS will also measure and record the station distribution buses including Class IE buses upon loading the bus to at least 30%.
This will.'occur prior to start-up.
PVNGS will measure and record grid and Class IE bus voltages and bus loading during the start-up of a large Class IE motor and also during the starting of a large non-Class IE motor.
The above information will be reviewed to verify analytic data.
I!""*""'" "
'"""C Power) art 1
Provide the time delay settings for the two 4160 volt safety related bus undervoltage relays.
Q/A'rgb 7 RESPONSE: g The induction disc relays have a dropout voltage fulCL Carne ~~7i~E',
that varies with time, so that theypdrey-out, if the voltage 7
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PQ SWuuPS Submit the following 1.nformatxon:
the voltage levels at the safety-related buses optimized for the maximum and minimum load conditions that are expected throughout the anticipated range of voltage variations of the off-site power sources by appropriate adjustment of the voltage tap settings of the intervening transformers.
The tap settings selected should Amendment 6
SA-28 October 1981