ML18044A477
| ML18044A477 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 01/31/1980 |
| From: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8002050523 | |
| Download: ML18044A477 (54) | |
Text
l
- .. i consumers Power company General Offices
- 212 West Michigan Avenue, Jackson, Michigan 49201 * (517) 788-0550 January 31, 1980 Director, Nuclear Reactor Regulation Att Mr Dennis L Ziemann, Chief Operating Reactors Branch No 2 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - LOSS OF OFFSITE POWER The information concerning the loss of offsite power events that have occurred at the Palisades Plant are attached.
This was requested by NRC letter dated September 25,.1979.
The partial loss of offsite power information since September 15, 1971 includes 89 such occurrences to date (see Attachment A).
Attachment B provides information of the loss of all offsite power for the dates of:
September 2, 1971; September 24, 1977; November 25, 1977; and December 11, 1977.
The NRC letter dated September 25, 1979 also indicated there was a loss of all offsite power at the Palisades Plant on October 17, 1974 and May 23, 1978.
Our records show there was not a loss of all offsite power experienced during these two dates.* On October 17, 1974, the unit was brought off line by the operators for AEC Operators' Licensing Examination.
On May 23, 1978, the unit was b.eing brought back on line from an outage when the unit tripped due to the 4160 V bus failing to transf~r. Neither one of these trips were due to loss of all offsite power.
To date, Palisades has not experienced any other loss of offsite power events other than those that are enclosed.
l)avid P Hoffman Nuclear Licensing Administrator CC JGKeppler, USNRC Attachment A, 48 Pages Attachment B, 4 Pages
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ATTACHMENT A
ATTACHMENT A PALISADES PLANT PARTIAL LOSS OF.OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta #2 Line tripped because of loss of carrier signal with fault on other lines.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for cycles during the fault and had no affecton the system.
The magnitude of voltage decreased was not determined.
NA S.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 6/27/78.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook #1 Line tripped for x phase to ground f~ill t cause'd by liglitn:ing.
- 3.
The dielectric.did not fail.on other circuits.
- 4.
Voltage decreased_for 2
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
5 ~
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
7,.
Da.te, of ey,ent 7 /22/78.
1
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Cook #2 Line tripped for X phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuit~.
- 4.
Voltage decrea~ed for __ 2_ cycles during the fault and had no._ affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 6/18/78.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
2
- 2.
Gause of loss *of circuit.
Palisades-Argenta #2 Line* tripped because relay was left cut out.
3*.
Tlie diele'cti::ic_ did. nO't fail on othe-r* circ*uits.
- 4.
Voltage decreased for ~
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 6/26/78.
- 1 3
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook #1 Line tripped by operator testing direct transfer trip.
- 3.
The dielectric did not fail on other circuits.
NA
- 4. *Voltage decreased for __ cycles during the.. fault, and had no affect on the system.
The. magnitude of voltage decreased was not determined.
NA
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 1/12/78.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisadei-Benton Harbor~Coo~ #1 Line tripped because pilot wire not cut out correctly.
- 3.
The di'electric*. did not fail* on other drttiits.
NA'
- 4.
Voltage decreased for __ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
NA
- 5.
No frequency decay.
NA
- 6.
The drcuit was interrupted for 9
minutes.
- 7.
Date of event 3/27/78.
4 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #1 Line tripped for Z phase to ground fault caused by ice/snow and wind.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage de~reas~d for __ 2_ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
S.
No frequency.decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 1/14/77.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause o.f loss of 'circuit.
Palisades-Jackson Road-Twin Branch Line tripped for X phase to. gro~d fault caused by ~c~/ snow and wind.
- 3.
The dielectiic did not fai~ on -0ther circuits~-
- 4.
Voltage decreased for ~
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 2/7/77.
(Time 12:29)
-.J 5
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- l. Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road~Twin Branch Line tripped for X phase to ground fault caused by ice/snow and wind.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for -*~2_._ cycles during the fault and had.no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 2/7 /77.
{Time 12: 37).
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road-Twin Branch Line tripped for Z & X phase to ground*fault caused by ice/snow and wind.-
3'.
The* dielectric"' did riot fa*il on* other* circuits.
- 4.
Voltage decreased for ~-2~ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
6.* The circuit was interrupted for 1
minute~
- 7.
Date of event 2/7/77.
(Time 12:58)
6 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road-Twin Branch Line tripped by X phase to ground fault caused by ice/snow and wind.
- 3.
The dielectric did.not fail on other circuits.
- 4.
Voltage decreased for 2
cycles during the. fault and had no affect on
_the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute*.
7..
Date of event. 2/7 /77.
(Time 13: 06)
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road-Twin Branch Line tripped for-Z phase to ground fault caused by ice/snow and wind.
3:
The dielectiic did not f*il on other circuits.
- 4.
Voltage decreased for 2
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 130 minutes.*
- 7.
Date of event 2/7/77.
(Time 13:20)
J..
--Automatic reclosing was* cut out at 13:11; line was closed manually.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road-Twin Branch Line was tripped for Z phase to ground faults caused by ice/snow and wind.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for ~~ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
NA
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 15 minutes.
- 7.
Date of event 2/7/77.
(Time 15:30)
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 2
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #i and P~lisades-Tallmadg~
112 Lines tripped for. simultaneous X phase to ground faults on each line caus.ed by lightning.
. 3.
The dielectric did.riot fail on other circuits.
- 4.
Voltage decreased for~-4~ cycles during the fault and had no *affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 3/12/77.
7
8 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss ~f circuit.
Palisades-Jackson Road-Twin Branch Line tripped for Z phase to ground fault caused by CT failure at Twin Branch.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for ~-2~ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was no~ determ~ned.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for minutes.
Lockout at Twin Branch.
- 7.
Date of event 3/30/77.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lo.st 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #1 Line tripped for X phase to ground fault; cause is not know.n.
- 3.
The diele~ttic did not fail on oth~r circtiits.
- 4.
Voltage decreased for ~
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 6/14/77.
9 PALISADES PLANT PARTIAL LOSS OF OFFSITE*POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause.of loss of circuit.
Palisades-Jackson Road-Twin Branch Line tripped for Y phase to ground fault caused by lightning.
- j.
The dielectric did not fail bn other circuits..
- 4.
Voltage decreased for ~
cycles during the fault and had no affect on the system.
The magnitude of voitage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minµte.
- 7.
Date of event 6/28/77.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #2 Line tripped bec.ause relays were left cut out at one end of the line.
- 3.
Tiie dielectric* dfd riot faiL. oh' otliei circuits.
NA
- 4.
Voltage decreased for cycles during the fault and had no affect on the system.
The magnitude of voltage decreased. was not determined.
NA
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 7/31/77.
- I
,l PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Numper of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #2 Line tripped because relays were left cut out at on.e end of the line.
- 3.
The dielectric did not fail on o.ther circuits.
NA
- 4.
Voltage decreased for cycles during the fault and had no affect on the system.
The magnitude of voltage decreased.was not determined.
NA
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 8/20/77.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service
-6 Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades~Benton Harbor-Cook Line circuit breakers at Palisades were.accidentally tripped during test of direct transfer trip scheme.
- 3.
The dielectric did not fail on other circui.ts.
NA
- 4.. Voltage decreased for __ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was. no.t determ:i.~ed'.
NA
- 5.
No frequency decay.
NA
- 6.
The circuit wa.s interrupted for 1
minute.
- 7.
Date of event 1/12/76.
11
PALISADES PLANT PARTIAL LOSS OFOFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #1 Line was tripped for Z to X phase fault caused by galloping conductors.
- 3.
The dielectric did not fail on other circuits.
12
- 4.
Voltage decreased for 3 + 3 cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.*
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 19 minutes.
- 7.
Date of event 3/1/76.
- Two similar faults occurred within the 19 minutes.
PALISADES PLANT.PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook Line tripped at Cook due to defective carrier receiver for fault on Kenowa-Ludington Line.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 2.5 cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
S.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of everit 3/2/76.
r 13 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuts in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road-Twin Branch Line tripped for X phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.*
- 4.
Voltage decreased for ~-3~ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 6/22/76.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
C~use of ioss of ci~cuit.
Palisades-Jack~on Road-Twin Branch Line tripped for X phase to ground fault caused by lightning.
3*.
The* di:el*ectti'c di:d~ not* fail oti: otherc circuits.
- 4.
Voltage decreased for -1..:2_ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 6/30/76.
14 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook Line tripped for X phase to ground fault caused by lightning.
The unit tripped off by incorrect operation of directional ground relay.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for ~-4~ cycles during the fault and had no affect on the system.. The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for
- 1.
minute.
- 7.
Date of event 7/20/76.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Nwriber of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road-Twin ~ranch Line tripped for X phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 2.5 cycles during the fault and had no affect on the. system.
The magnitude of voltage decreased was not determined.
- 5.
No frequenci decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 7/24/76.
15 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road-Twin Branch Line tripped for Y phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 2.5 cycles during the fault and had no aff~ct on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 8/27/76.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades~Benion Harbor-Cook Line tripped bi incorrect relaying. when Benton Harbo.r transformer was energized.
3:
The dieTe'ctric did noY* fail oh" of.lier:. cfrtliits.
NA
- 4.
Voltage decreased for ~~ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
NA
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 12/17/76.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook #1 Line tripped when air-break switches were closed at Benton Harbor.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for ~*~* cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
NA
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 12/15/78.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of citcuit.
Palisades-Benton Harbor-Cook Litie tripped because of loss of carrier signal for fault on I&M 345 kV sys*tem.
- 3.
The* dfelectdc did not fa-H o'n other circuits1... NA 16
- 4.
Voltage decreased for 21 cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The. circuit was interrupted for 1
minute.
- 7.
Date of event 3/22/75.
17 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of -circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook Line tripped for Y phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for ~
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 4/18/75.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #1 Line tripped because of loss of carrier signal for fault on a 138 kV line.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for ~
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 30 minutes.*
- 7.
Date of event 6/4/75.
- Approximate time - Actual time was not recorded in report.
~--
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades~Jackson Road-Twin Branch Line was tripped for X phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits~
18
- 4.
Voltage decreased for 2.5 cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event.8/10/75.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #2 ~ine was tripped at Tallmadge by operator clearing substation alarm.
- 3.
The dielectric*did~-not fail on-other circuits.
NA
- 4.
Voltage decreased for.J!!__ cycles during the fault and had no. affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The ci~cuit was interrupted for 10 minutes.~~
- 7.
Date of event 8/18/75
- Estimated time - Time not recorded in report.
19 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #1 Line tripped because of loss of carrier signal for fault on a 138 kV line.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for ~
cycles*.during the fault and had no affect on
- the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 30 minutes.*
- 7.
Date of event 6/4/75.
- Approximate time - Actual time was not recorded in report.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road-Twin Branch Line was tripped for X phase to ground fault caused by lightning.
- 3.
The dielectriG did not fail on -Other circuits.
- 4.
Voltage decreased for 2.5 cycles during the fault and had no affect on
.the system.* The magnitude of voltage decreased was not. determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
1:
Date of event 8/10/75.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Nlimber of circuits in service 6
Ntimher of circuits lost l
20
- 2.
Cause of loss of circuit.
Palisades-Argenta #1 Line tripped 1ncorrectly for Z phase to **ground fault on Argenta-Tallmadge Line.
The instantaneous element overreached because.several lines were out.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 5
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 3/29/74.
@ 1137
21 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road-Twin Branch Line tripped for Y phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for __ 2_ cycles during the fa:ult and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No. frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 4/14/74.
PALISADES PLANT PARTIAL LOSS OF OFFSITE*POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook Line tripped for problems on I&M 138 kV system.
3-.
The dieleC:tric did' riot fail on** o'the"r circuits**.
NA
- 4.
Voltage decreased for NA cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 14 minutes.
- 7.
Date of event 6/20/74.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Twin Branch-Cook Line tripped for
- problems on I&M system.
- 3.
The dielectric did not fail on other circuits.
NA 22
- 4.
Voltage decreased for NA cycles during the' fault and had no af.fect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 6/20/74.
@ 2208 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge Ill Line tripped for X phase to ground fault caused by lightning.
- 3.
The dielectric did* not fail on other circuits.
- 4.
Voltage decreased for __ 2_ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 8/26/74.
23 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta #2 Line tripped by contractor working in substation.
3..
The dielectric did not fail on other circtii ts.
NA
- 4.
Voltage decreas,ed for NA cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
S.
No frequency decay.
NA
- 6.
The circuit was interrupted for minutes.-!*
60
- 7.
Date of event 2/28/73.
- Estimated time - Actual time not recorded on report.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisade~-Twin Branch Line tripped for Y*phase to groun4 faults caused by lightning.
- 3.
TJ:i.-~.. dielectric did not f~il on other circuits.
- 4.
Voltage decreased for 2
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Dat~ of event 3/31/73.
24 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number o'f circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook.Line tripped for a ground fault on I&M 138 kV system due to failed carrier receiver.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for~ cycles during the.fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
S.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 3/31/73.
- PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of.circuits in service 4
Number of circuits lost 2
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor~Cook Line tripped for ground fault on I&M 345 kV system due to failed carrier receiver.
Palisades-Twin Branch tripped for same fault due to carrier failure.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for ~-3~ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
D*te of event 4/22/73.
25 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circriit.
Palisades~Twin Branch Line tripped for fault in I&M system due to carrier failure.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased* for 3
cycles during. the.* fault and had no affect on the system.
The magnitude of voltage decreased was not determined~.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for*
1 minute.*
- 7.
Date of event 5/21/73.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service -. 4 Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades;..Twin Bra_nch Line tripped for X. phase to ground fault caused by lightning.
- 3.
The dielectric did not fiil on other cirttiit~. *
- 4.
Voltage decreased for 3.5
- cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.-
- 5.
No.frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 5/23/73.
26 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 2
- 2.
Cause of loss of circuit.
Palisades-Twin Branch Line tripped for Y phase to ground fault caused by lightning.
Palisades-Benton Harbor-Cook tripped for same fault due to carrier failure.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for -1..:.Q_ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 6/23/73 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
. 2.
Cause of loss of circuit.
Palisades--Benton Harbor-Cook Line tripp-ed for ground fault on I&M 138 kV system due to carrier failure.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for ~
cycles during the fault and had no affe~t on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequeni:y decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 7/26/73.
._...,._~*--- ---*--
~---.L-------------'---------.........
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook Line tripped for ground fault on I&M 345 kV system due to carrier failure.
- 3.
The dielectric did not fail on other circuiti.
- 4.
Voltage 'decreased for __ 3_ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 7/31/73.
@ 0429 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Numb'er of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook Line tripped for ground fault on I&M 345 kV system due to carrier failure..
- 3.
The* diel*e-ctdc did not fail on other circuits.
- 4.
Voltage decreased for __ 3_ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit.was interrupted for 1
minute.
- 7.
Date of event 7/31/73.
@ 0436 27
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #2 Line was tripped at Tallmadge by operator clearing substation alarm.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for ~
cycles during the _fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
.6.
The circuit was interrupted for 10 minutes.*
- 7.
Date of -event 8/18/75
- Estimated time - Time not recorded in report.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service
~ 6 Number of circuits lost.l 28
- 2.
Cause of loss of circuit~ Palisades-Argenta #2*Line tripped at Argenta by*
failed relay.
3*.
Th~* di*ele*~tr{c di.d**not fail on other circuits.
NA
- 4.
Voltage decreased for ~
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 30 minutes.*
- 7.
Date of event 12/9/75
~\\-Approximate time - Actual time was not recorded on report.
29 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Jackson Road-Twin Branch Line tripped for Z phase to ground fault; cause of fault unknown.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for ~-2~ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
_No frequency decay.
- 6.
The circuit.was interrupted for 1
minute.
- 7.
Date of event 1/11/74.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6,..
Number of circuits lost. 1
- 2.
Cause of loss**'*Of circuit.
Palisades-Jackson Road-Twin Branch Line tripped for Y phase to ground fault due to incorrect relaying,.
3*.*
The di.el~ctric did not fail on o'ther cir~\\lits.
- 4.
Voltage decreased for 3
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased wa_s not determined.
- 5.
No frequency decay;
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 3/7/74.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Tallmadge #2 Line tripped for X and Z phase to ground fault; caused by ice/snow and wind (2 operations).
3.. The dielectric did not fail on other circuits.
- 4.
Voltage decreased for ~
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased' was not determined.
- 5.
No frequency decay.
- 6.
T~e circuit was interrupted for 1
minute.
- 7.
Date of event 3/28/74.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service. 6 Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta #1. Line tripped incorrectly at Palisades for faults on the-.Argenta-Tompkins Line.. The faults were caused by ice/snow and wind.
- 3.
The dielectric did riot fail on other circuits.
4.. Voltage decreased for ~-7~ cycles during the fault and had no affect on the system.. The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for.
1 minute.
- 7.
Date of event 3/28/74.
@ 2251 30
- -------.~----*
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta #1 Line tripped incorrectly at Palisades for faults on the Argenta-Tompkins Line.
The faults were caused by, ice/snow and wind.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for ~-7~ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 3/28/74.
@ 2252 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Nuinber of circuits in service 6
Number of circuits lost l'
- 2.
Cause* of loss of circuit.. Palisades-A-:rgenta #1 Line tripped incorr.ectly for Y phase to ground fa~lt on Argenta 345 kV bus.
The instantaneous element overreached because several lines were out.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 3
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 3/29/74
@ 0704 31
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta #1 Line tripped for Z phase to ground fault; caused by ice/snow and wind.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 3.5 cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 3/29/74.
@ 1041 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
32
- 2.
Cause of loss of circuit.
Palisades-Argenta #1 Line tripped incorrectly for Z phc.ise to ground fall,lt on *Argenta-Tallma9ge Line.
The instantaneous element overreached because several lines were out.
3*..
The diel.ectric did not fail on other ci-rcuits.
- 4.
Vol~age decreased for ~-5_._ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not det~rmined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 3/29/74.
@ 1129
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook Line tripped by men working in substation.
- 3.
The dielectric did not fail on.other circuits.
NA
. 4.
Voitage decreased for NA cycles during. the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 30 minutes.*
- 7.
Date of event 8/11/73.
- Estimated time - Actual time not recorded on report.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service Ntimber of circuits *lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook Line tripped for faults in Benton Harbor. transformer.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 2.5 cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 8/11/73.
33
34 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 2
- 2.
Cause of loss of circuit.
Palis~des-Tallmadge #2 Line tripped for X phase to ground fault caused by lightning.
Palisades-Argenta #1 Line tripped by same fault due to wiring error.
- 3.
The dielectri~ did not fail on other circuit~.
- 4.
Voltage deer.eased for _._3_ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute..
- 7.
Date of event 8/20/73..
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Nwilber of circuits lost 1
- 2.
Cause of. loss of circui.t.
Palisades-Twin Branch Line tripped for Y pha.!i~
to ground fault caused by lightning.
3.. The dielectric did not fail on other circuits.
- 4.
Voltage decreased for __ 2_ cycles during the fault and had no affect on the system.
The magnitl1de of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 9/21/73.
35 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 6
Number of circuits lost 1
- 2.
Cause of loss circuit.
Palisades-Twin Branch Line tripped for Y phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltagedecreased for 3
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 9/25/73.
.. PALISADES PLANT PARTIAL LOSS OF OFFS I TE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta #2 Line tripped; cause unknown.
Construction work in substation.
- 3.
The dielect:ric did* not fail-on other circu+/-ts*.
NA
- 4.
Voltage decreased for ~
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 1/13/72.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1. *Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.. Palisades-Argenta #1 Line tripped; cause unknown.
Construction work in substation.
- 3.
The dielectric did not fail on other circuits.
NA 36
- 4.
Voltage decreased for ~.cycles during the fault and had no affec;t on*
the system.
The. magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 1/14/72.
@ 1546 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service
. 4 Number of circuits.lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta #1 Line; cause unknown.
Construction work in substation.
- 3.
The dielectri*c did not fail orF other circuits-.
NA
- 4.
Voltage decreased for ~
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 1/14/72.
@ 1650
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number. of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta fll Line; cause unknown.*
Construction work in substation.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for. NA cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 30 minutes.*
- 7.
Date of event. 1/14/72.
@ 1651
- Estimated time - Actual time not recorded in report.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number*. of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta fll Line; cause unknown.
Construction work in substation.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for NA cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA -
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 1/14/72.
@ 1729 37
38 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number. of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta #1 Line; cause unknown.
Construction work in substation.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for NA cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined..
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 30 minutes.*
- 7.
Date of event 1/14/72.
- Estimated time - Actual time not recorded on report.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
2:
Cause of loss of circuit.
Palisades-Argenta #2 tripped caused by investigating problem in station.
- 4.
Voltage decreased for NA cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 30 minutes.*
- 7.
Date of event 2/11/72.
- Estimate time - Actual time not recorded in report.
- .J 39 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER 1.. Number of_ circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Twin Branch Line was tripped for Y phase to ground fault caused by lightning.
Two operations failed on first reclose.
- 3.
The dielectric did not fail on oth~r circuits.
- 4.
Voltage decreased for 2.0
- cycles during the fault and had rio affect on the system.
The magnitude of voltage decreaseo was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 4/15/72.
PAtISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta f}l Lin~ tripped while.. testing relays.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for NA cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 4/24/72.
.e PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta #1 Line tripped for Z ~hase to ground fault.
- 3.
The dielectric did not fail on other circuits.
40
- 4.
Voltage decreased for 3.5 cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
- minute.
- 7.
Date of event 4/29/72.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
. 1.
- Number of circuits in service 4
Number of circuits lost 2
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Olive Line tripped for X phase to ground fault caused by lightning.
Palisades-Argenta ffl Line tripped,for same fault due to carrier failure. *,
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 3.5
- cycles during the fault and had no affect on the system..The magnitude of voltage decreased was not de~ermined.
- 5. -No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 7/15/72.
41 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of ci'rcuits lost 1
- 2.
Cau~e of loss of circuit.
Palisades-Twin Branch Line tripped for X phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 4
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1. minute.
- 7.
Date of event 7/17/72.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in: service 4
Number of circuits lost 1
- 2.
Cause of los~ of circuit.
Palisades-Benton Harbor-Cook Line tripped for Y phase to ground fault in I&M system due to carrier failure.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 5
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 8/14/72.
- e.
42 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Twin Branch Line tripped for Y phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage de.creased for 3.5 cycles during the fault and had no affect on the system:
The magnitude. of voltage decreased wa*s not determined. *
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 8/14/72.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER 1.. Number of circuits in ser'7ice '- 4 *..
Number of circuits lost L
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook Line tripped* for gr9urid fault in I&M system due to carrier failure.
- 3.
The* dielectric did*: not fail on other' circuits'.
- 4.
Voltage decreased for 3
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No.frequency decay.
- 6.
The circuit.was interrupted for 1
minute.
- 7.
Date of event 9/13/72.
43 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Twin Branch Line tripped for Y phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage de~reased for 3.5 cycles during the fault and had-no affett on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 9/13/72 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Cook Line "tripped for ground fau.lt, in I&M system due to carrier failure.
- 3.
- The dielectric did not fail on other circuHs..
- 4.
Voltage decreased for __ 3_ cycles during the fault and had no affect on the system.
The. magnitude of voltage decreased was not* determined..
- 5.
No frequency decay.
- 6.
The circuit was interrupted-for 1
minute.
- 7.
Dat~ of event 9/13/72.
44 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Twin Branch line tripped for X phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.
4.. Voltage decreased for 2.5 cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
'minute.
- 7.
Date of event 9/18/72.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number. of circuits lost 1
2:
Cause of loss of circuit.
Palisades-Twin Branch Line tripped for X phase to ground fault caused by lightning.
3*.
The' dielectric did' not fail on other circuTts.
- 4.
Voltage decreased for 2
cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 6/6/71.
45 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Twin Branch Line tripped for Y phase to ground fault caused by lightning:
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for 2
cycles during. the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 7/8/71.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service
. 4 Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton Harbor-Olive Line tripped for Y phase to ground fault caused by lightning.
3'~
The* diel"ectric did not fail on other circuits*.
- 4.
Voltage decreased for ~-2~ cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 7/15/71.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Argenta #1 Line tripped by relay failure.
- 3.
The dielectric did not fail on other circuits.
NA 46
- 4.
Voltage decreased for
.NA cycles during the fault and had no affect on the system.
The magnitude* of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 60 minutes.*
- 7.
Date of event 8/17/71.
- Estimated time - Actual time not recorded on report.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palis~des-Argenta #1 Line tripped fdr Y phase 3*.
- 4.
- 5.
to ground fault caused by lightning.
Voltage decreased for 2
cycles during the fault and had no affect on the system.
The magnitude of voltage dacreased was not determined.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 8/24/71.
'It 47 PALISADES PLANT PARTIAL LOSS OF OFFSITE.POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit.
Palisades-Twin Branch Line tripped for X phase to ground fault caused by lightning.
- 3.
The dielectric did not fail on other circuits.
- 4.
Voltage decreased for
. 2 cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 8/24/71.
PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuits lost 1
- 2.
Cause of loss of circuit. *Palisades-Twin Branch Line tripped while relays were bei~g tested.
- 3.
The* dielectric did not:' f.iil on otlier circuits.
NA
- 4.
Voltage decreased for NA cycles during the fault and had no affect on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 30 minutes.~"
- 7.
Date of event
- 9/15/71.
- Estimated time - Actual time not recorded on report.
l I
~**.i 48 PALISADES PLANT PARTIAL LOSS OF OFFSITE POWER
- 1.
Number of circuits in service 4
Number of circuit~ lost 1
- 2.
Cause of loss of circuit.
Palisades-Benton *Harbor-Olive Line tripped due to operating error.
- 3.
The dielectric did not fail on other circuits.
NA
- 4.
Voltage decreased for NA cycles during the fault and had no affect<*on the system.
The magnitude of voltage decreased was not determined.
- 5.
No frequency decay.
NA
- 6.
The circuit was interrupted for 1
minute.
- 7.
Date of event 11/10/71.
ATTACHMENT B
1 ATTACHMENT B PALISADES LOSS OF ALL OFFSITE POWER
- 1.
Power was off 56 minutes with no partial recovery.
Loss of power was caused by 27R8 ACB failure to trip for X phase to ground fault on *the Palisades-Argenta #2 Line.
At the same time an X phase to ground fault was cleared successfully on the Palisades-Argenta #1 Line.
The 27R8 breaker failure relay operated_to trip the "R" bus to clear the faulted line.
The "R" and power was returned to service after the lockout relays were reset.. Two 345 kV lines serving the substation were not interrupted.
The Palisades-Argenta #1 Line was restored automatically aftei 31 cycles.
- 2.
The plant was in cold shutdown condition; therefore, there wasn't any turbine trip.
- 3.
NA
- 4.
- The voltage was decreased due to the fault for 8,5 cycles prior to the loss of power.
The* voltage dip had no affects on the system.
The magnitude of the voltage decreased wa,s not determined.
- 5.
No frequency decay.
- 6.
Date of event 9/2/71.
{~,
PALISADES LOSS OF ALL OFFSITE POWER
- 1.
How long was the power off?
How long for partial recovery?
Please give details.
Power was off for 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and 45 minutes.
2 The cause of the "R" bus loss is not known.
Loss of offsite power causes a loss of main condenser cooling water.. Thus, the main turbine tripped on high back pressure and tripping of the main generator and reactor occurred.
Botl:i emergency diesel generators started immediately, loaded properly and performed satisfactorily throughout the incident.
The secondary system was isolated, primary system stabilized and the plant functioned as designed during the incident.
Atmospheric dumps were operated as necessary to maintain PCS temperature.
- 2.
If turbine trip ~ccurred, how soon after did loss of offsite power occur?
The turbine is interlocked with the reacto.r such that a reactor trip also trips the turbine at the same time.
3*.
If power was recovered promptly (10 minutes or less),. was it due to automatic or manual actions?
NA
- 4.
Was any voltage increase or decrease experienced just prior to o*r during the outage? If so, pleasegive details, voltages reached, affects, etc.
NA
- 5.
Was any frequency decay experienced just prior to or during the outage?
If so, please give details, lowest frequency reached, decay rate, affects on equipment o'pera ti on,. etc; NA
- 6.
Date of event 9/24/77.
)
PALISADES LOSS OF ALL OFFSITE POWER
- 1.
How long was the power off?
How long for partial recovery?
Please give details.
Power was off for 3.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.
During normal operation, the "R" bus became de-energized causing a complete loss of offsite power and resulting in a loss of condenser cooling water.
The reactor was manually tripped which resulted.in a turbine trip.
The cause of this loss is not known..
- 2.
If turbine t~ip occurred, how soon after did loss of offsite power occur?
The turbine is interlocked with the reactor such that a reactor" trip also trips the tut'bine at the same time.
- 3.
If power was recovered promptly (IO minutes or less), was it due to automatic or manual actions?
NA
- 4.
Was any voltage increase or decrease experienced just prior to or during the outage?
If so, please give details, voltages reached, affects~ etc.
NA
- 5.
Was any frequency decay experienced just prior to or during the outage?.
If so, please give details, lowest frequency reached, decay rate, affects on equipmen~ operation, etc.
NA 6.' Date of event 11/25/77.
3
\\
PALISADES LOSS OF ALL OFFSITE POWER
- 1.
How long was the power off?
How long for partial recovery?
Please give details.
Power was off for 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.
The "R" bus was de-energized causing a complete loss of offsite power and resulting in loss of main condenser cooling water.
The plant was manually tripped which caused a turbine trip.
Both diesels started immediately and supplied power during the 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> that offsite power was lost.
The cause of this loss is not known.
- 2.
If turbine trip occurred, how soon after did loss of offsite power occur?
4 The turbine is interlocked with the reactor, such that a reactor trip also trips the turbine at the same time.
- 3.
If power was recovered promptiy (10 minutes or less), was it due to automatic or manual actions?
NA
- 4.
Was any voltage increase or decrease experienced just prior to or during the outage? If so, please give details, voltages reached, affects, etc.
NA
- 5.
Was any frequency decay experienced ju&t prior to or during the outage?
If so, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc.
NA
- 6.
Date of event 12/11/77.