ML19256G097

Forwards Complete Offsite Power Outage History,Containing Responses to NRC 790918 Questions.Description of Intended Transmission Line Mods to Minimize Frequency of Simultaneous 345 Kv Line Outages Due to Lightning Encl

ML19256G097
Person / Time
Site:	Pilgrim
Issue date:	12/20/1979
From:	Andognini G BOSTON EDISON CO.
To:	Ippolito T Office of Nuclear Reactor Regulation
References
79-271, NUDOCS 7912270419
Download: ML19256G097 (43)

Text

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. -o j rv BOSTON EDISON COMPANY /

ocNrs.L ornces eco sortsToN sTaccT SOETON, MASSACHUSETTS o 2199

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. o , "i^c", 0,,",'"' Deeember 20, 1979 NUCLE AN O,ER ATIONE DESANTMENT BECo Ltr. # 79-271 Mr. Thomas A. Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Ccemission Washington, D. C. 20535 License No. DPR-35 Docket No. 50-293 Information on the Pilgrim Unit #1 Offsite Power Svstem

Reference:

A) NRC letter (T.A. Ippolito) to Boston Edison Company (G.C. Andognini) dated September 18, 1979.

Dear Mr. Ippolitc:

Reference A) requested additional information concerning the loss of offsite power events at Pilgrim Unit /!1.

In response to this request we have accumulated a complete offsite power outage history for Pilgrim I which contains responses to your specific questions. Also included is a brief description of our intended transmission line modifications (Attachment C), which when implemented, will minimize the frequency of simul-taneous 345Kv line outages due to lightning.

If during your review of the attached information, you should have any questions or concerns, please do not hesitate to contact us.

Very truly yours,

? W V/x. v 4 8' &-

4w

,,,, 1643 291 Attachments A. Summary of Forced Outages B. Details of Forced Outages C. Description of Transmission Line Modifications AWS S

q 9/2;L90 V l

',* ATTACHMENT A

-

• Sheet 1 of 3

SUMMARY

FORCED OUTAGES OF 0FFSITE POWER AT PILGRIM STATION 345 kV 23 kV Date Line Line Reason Out h Outage Duration 2/19/72 -

1. 13 Snow Storm - - I hr. - 36 min.

9/03/72 -

1. 13 Tropical Stonn - - Not recorded

1. 13 Tropical Storm - -

Not recorded 9/04/72 -

1. 13 Broken tie wire 1112 1143 31 min.

2/02/73 -

3/29/73 #355 -

Flashover 0146 1231 10 hr. - 45 min.

1. 355 -

Flashover 2251 1755 19 hr. - 4 min.

(3/30) d342 Tripped when unit tripped 1114 1209 55 min.

9/08/73 -

3/21/74 #342 -

Flashover at Bourne 0609 0722 1 hr. - 13 min.

4/15/74 4 342+ - Lightning 0015 0123 1 hr. - 8 min.

4 355+ - 0015 0037 22 min.

5/07/74 =355 -

Lightning 1704 1710 6 min.

5/26/74 #342' -

Unknown 1129 1248 1 hr. - 19 min.

4355+ - 1129 1250 1 hr. - 21 min.

9/06/74 - el3 Tree triming - -

10 sec.

11/10/74 =342 -

Flashover 2338 1613 16 hr. - 35 min.

(11/11) 11/11/74 4355 -

Flashover 0233 1853 16 hr. - 20 min.

4355 -

Unknown 1902 2011 1 hr. - 9 min.

1. 13 High Winds / Heavy rain 0545 0545+ 10 sec.

11/13/74 -

12/02/74 -

1. 13 Tree touching line 0646 0747 1 hr. - 1 min.

1. 13 Tree touching line 1357 1406 9 min.

12/25/74 -

10 sec. 413 Car hit pole 1510 1510+

4342 Unknown 1141 1159 18 min.

4/30/75 -

7 hr. - 5 min.

1. 342 -

Unknown 1208 1913 5/01/75 #342 - Tree touching line 1247 2236 9 hr. - 49 min.

9/12/75 - #13 Car hit pole 0113 0629 5 hr. - 16 min.

1643 292

4 .

Sheet 2 of 3 345 kV 23 kV Date Line Line Reason Out In Outage Duration 9/13/75 #342 + -

Stuck breaker 1330 1356 26 min.

1. 355 + -

1330 1431 1 hr. - 1 min.

1/12/76 -

1. 13 Tree touching line 1054 1153 59 min.

3/13/76 #342 + -

Lightning 1454 1526 32 min.

1. 355 + -

1454 1454+ Inst.

6/19/76 -

1. 13 Pole down 2322 2324 2 min.

8/04/76 4342 -

Faulty relay 1357 1359 2 min.

1. 342 -

1502 1503 1 min.

12/12/76 -

1. 13 Unknown 0950 0950+ 10 sec.

1/07/77 =355 -

Snow storm 2231 2231+ Inst.

1. 355 -

2301 2301+ Inst.

1/10/77 =355 -

Broken static wire 1413 2230 32 hr. - 17 min.

(1/11) 1/12/77 -

1. 13 Unknown - -

10 sec.

5/01/77 =342 + -

Fire 1437 1508 31 min.

4355 * -

Out for maintenance ---- ---- -------

5/02/77 #342 -

Faulty relay 0722 1016 2 hr. - 54 min.

5/10/77 #342 ++ -

Snow storm 0905 1945 9 hr. - 40 min.

1. 355 ++ 0905 1945 9 hr. - 40 min

1. 13"+ 0904 1144 2 hr. - 40 min.

7/21/77 -

1. 13 Lightning 1853 1853+ 10 sec.

12/06/77 #342 -

Stuck breaker 1848 2046 1 hr. - 58 min.

1/20/78 i355 -

Fallen lightning pole in 1453 1804 27 hr. - 11 min.

switchyard (1/21) 2/06/78 #342++ -

Snow storm 1933 1411 18 hr. - 38 min.

(2/7)

1. 355++ 1933 1407 18 hr. - 34 min.

(2/7)

1. 71 ++ 1840 2047 2 hr. - 7 min.

2/07/78 -

1. 71 ++ Snow storm - -

8 hr. 54 min.

1. 71 ++ 1 hr. - 5 min.

7/03/78 -

1. 71 Faulty relay 0113 0253 1 hr. - 40 min.

8/06/78 3342 + -

Lightning 1153 1215 22 min.

1. 355 + -

1153 1215 22 min.

7/27/79 #3a2 * -

0102 0116 14 min.

1. 355 + Lightning 0102 0116 14 min.

l()43 2.93

Sheet 3 of 3 345 kV 23 kV Date Line Line Reason Out h Outage Duration 8/28/79 #342+ - Lightning 0030 0046 16 min.

1. 355+ -

0030 0046 16 min.

• Line #13 reidentified line #71 on 12/23/77 when the Manomet substation was energized.

+ Loss of all 345KV offsite power

++ Loss of all 345KV and 23KV offsite power 1643 294

A1TACllMENT B -

Sheet 1 of 38

.I '

PARTIAL X PILGRIM UNIT 1 TOTAL LOSS OF 0FFSITE POWER DATE 2/19/72 f.

j' s

345 KV LINES 23 kV LINE i; CIRCUITS NORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71 h i

CIRCUITS AVAILABLE PRIOR TO EVENT x X X j OUT IN DURATION OUT IN DURATION OUT g DURATION CIRCUITS INTERRUPTED N/A N/A - -

I hr. 36 min.

PARTIAL LOSSI Why did some lines not fall when others did? 23 kV line is isolated TOTAL LOSSI If turbine trip occurred, how soon after did loss of offsite power occur? N/A S,

If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVENT (S): j t

Max Hin Rated Duration Snow storm f Ch

[ Voltage (KV) y frequency (NZ) REMARKS:

w ty, Remarks: Not available None

, ;lt f!I l

- l{  ;]

N O

I 2 E 1 T -

7 N 7 A A / I / R 3 4 L 3 U 1 D f r V #

o o k X E

2 t

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/

9 3

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Sheet 3 of 38 PARTIAL X PILGRIM UNIT 1 TOTAL LOSS OF 0FFSITE POWER DATE 2/2/73 l

345 KV LINES 23 kV LINE i CIRCUITS NORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71 X X X  ;

CIRCUITS AVAILABLE PRIOR TO EVENT OUT IN DURATION OUT g DURATION OUT IN DURATION CIRCUITS INTERRUPTED N/A N/A 1112 1143 31 min PARTIAL LOSSI Why did some lines not fall when others did? 23 kV line is isolated TOTAL LOSS!

If turbine trip occurred, how soon after did loss of offsite power occur? N/A {I N/A ,

If power was recovered within 10 minutes, was it due to automatic or manual actions? I CAUSE OF EVENT (S): [

VOLTAGE / FREQUENCY EXCURSIONS Max Min Rated Duration Broken tie wire ,

$ Voltage (KV) "

Frequency (NZ) REMARKS:

i N

W Remarks: Not available None N

N O

I E 1 T N 7 A I / R s 8 3 U 3 3 L 1 D r 7 V # t o

f / k X o 9 E a

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Sheet 5 of 38 - ;

1 PILGRIM UNIT 1 TOTAL LOSS OF 0FFSITE POWER DATE 9/8/73 l

345 KV LINES 23 kV LINE  !

CIRCUITS NORMALLY AVAILABLE LINE #355 LINE #13/71 LINE #342 CIRCUITS AVAILABLE PRIOR TO EVENT X X X OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCulTS INTERRUPTED 1114 1209 55 min N/A N/A '

t PARTIAL LOSSI  !,

Why did some lines not fail when others did? Stuck breaker ,

TOTAL LOSS!  !

If turbine trip occurred, how soon after did loss of offsite power occur? N/A If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A .

i VOLTAGE /FREQ. .1CY EXCURSIONS CAUSE OF EVENT (S):

Max Min Rated Duration Tripped when unit tripped Ch C Voltage (KV)

Frequency (HZ) REMARKS: ,

N W 't

• w Remarks: Not available None

Sheet 6 of 38 J PILGRIM UNIT 1 TOTAL LOSS OF 0FFSITE POWER DATE 3/21/74 345 KV LINES 23 kV LINE CIRCUITS NORMALLY AVAILABLE LINE #355 LINE #13/71 LINE #342 X X X CIRCUITS AVAILABLE PRIOR TO EVENT OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCUITS INTERRUPTED 0609 0722 1 hr/13 min N/A N/A PARTIAL LOSS!

Why did some lines not fail when others did? line was isolated TOTAL LOSS!

If turbine trip occurred, how soon after did loss of offsite power occur? N i If power was recovered within 10 minutes, was it due to automaticctions? or manual N/A a/A VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVENT (S):

Max Min Rated Duration flashover at Bourne

~

ch ad. Voltage (KV) u None Frequency (HZ) REMARKS:

w O Remarks: Not availabe Q

Sheet 7 of 38 .

~

PILGRIM UNIT 1 TOTAL LOSS OF 0FFSITE POWER DATE 4/15/74 5

345 KV LINES 23 kV LINE CIRCulTS NORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71 X X X CIRCulTS AVAILABLE PRIOR TO EVENT OUT IN DURATI0tt OUT IN DURATION OUT IN DURATION CIRCulTS INTERRUPTED 0015 0123 1 hr/8 min 0015 0037 22 min N/A PARTIAL LOSS!

Why did some lines not fall when others did? 23 kV line is isolated TOTAL LOSS!

If turbine trip occurred, how soon after did loss of offsite power occur? N/A If power was recovered within 10 minutes, was it due to autoaatic or manual actions? N/A VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVfMT(S):

Max Min Rated Duration lightning

-' Voltage (KV)

A frequency (ItZ) REMARKS: None LN

,y Remarks: Not available CD T

Sheet 8 of 38 .

X .;

PILGRIM UNIT 1 LOSS OF OFFSITE POWER TOTAL

, DATE 5/7/74 345 KV LINIS 23 kV LINE ,

CIRCUITS NORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71 CIRCUITS AVAILABLE PRIOR TO EVENT X X X OUT IN DURATION ( UT IN DURATION OUT IN DURATION CIRCUITS INTERRUPTED

{

N/A 17)4 1710 6 min. N/A i PARTIAL LOSSI Why did some lines not fall when others did?

line was isolated ,

l l

TOTAL LOSS!

If turbine trip occurred, how soon after did loss of off site power occur? N/A ,

If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A  :

t VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVENT (S): I Max Min Rated Duration Lightr.ing Ch a Voltage (KV) '

u Frequency (HZ) REMARKS:

u ,

C"3 Remarks: Not available I N None '

Sheet 9 of 38 -

PARTIAL X '.

PILGRIM UNIT 1 LOSS OF 0FFSITE POWER TOTAL

, DATE S/26/74 ',

t 345 KV LINES 23 kV LINE 4 CIRCUITS NORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71 CIRCUITS AVAILABLE PRIOR TO EVENT X X X OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCUITS INTERRUPTED 1129 1248 1 hr/19 min 1129 1250 1 hr/21 min N/A i l

i PARTIAL LOSSI Why did some lines not fall when others did?

23 kV line is isolated TOTAL LOSS!

If turbine trip occurred, how soon after did loss of offsite power occur? N/A If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVENT (S):

Max Min Rated Duration Unknown '

I 4

Voltage (KV) u o Frequency (HZ) REMARKS:

u -

Remarks: Not Available  !

None

~

Sheet 10 of 38

~

PILGRIM UNIT 1 LOSS OF OFFSITE POWER TOTAL

, DATE 9/6/74 345 KV LINES 23 kV LINE i CIRCUITS HORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71 CIRCUITS AVAIL AtiLE PRIOR TO EVENT X X X OUT IN DURATION OUT IN DURATION OUT IN DURATION  !

CIRCUITS INTERRUPTED N/A N/A - -

10 sec.

PARTIAL LOSSI  ;

Why did some lines not fall when others did? 23 kV line is isolated f i

TOTAL LOSSI  :

If turbine trip occurred, how soon after did loss of offsite power occur? N/A t If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVENT (S):

Max Min Rated Duration Unknown

" Voltage (KV) u Frequency (HZ) REMARKS:

CD w Remarks: Not Available Tree triuming in progress

Sheet 11 af 38 -

i PILGRIM UNIT 1 TOTAL LOSS OF 0FFSITE POWER DATE 11/10/74 345 KV LINES 23 kV LINE  !

CIRCUITS NORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71 ,

X CIRCUITS AVAILABLE PRIOR TO EVENT X X OUT IN DURATION g OUT IN DURATION OUT IN DURATION CIRCUITS INTERRUPTED N/A 2338 1613 16 hr/35 min N/A O'A)

PARTIAL LOSS!

Why did some lines not fall when others did? line was isolated .

TOTAL LOSS!

If turbine trip occurred, how soon after did loss of offsite power occur? N/A f If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A V0LTAGE/ FREQUENCY EXCURSIONS CAUSE OF EVENT (S):

Max Min Rated Duration Flashover-

_c:::. Voltage (KV) u Frequency (llZ) REMARKS:

u O Remarks: Not Available None

N O

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Sheet 25 of 38 PILGRIM UNIT 1 TOTAL LOSS OF 0FFSITE POWER DATE 1/7/77 345 KV LINES 23 kV LINE CIRCUITS NORMALLY AVAILABLE LINE #355 LINE #13/71 l LINE #342 X X X CIRCUITS AVAILABLE PRIOR TO EVENT OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCUITS INTERRUPTED N/A 2231 2231+ inst. N/A 2301 230l + inst.

PARTIAL LOSS!

Why did some lines not fail when others did? line was isolated TOTAL LOSSI If turbine trip occurred, how soon after did loss of offsite power occur? N/A If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A VOLTAGE /TREQUENCY EXCURSIONS CAUSE OF EVENT (S):

Max Min Rated Duration Flashover during snow storm

[

Voltage (KV)

$ Frequency (HZ) REMARKS:  !

Remarks: Not available None cm e

Sheet 26 of 38 PARTIAL X PILGRIM UNIT 1 LOSS Of 0FFSITE POWER TOTAL DATE 1/10/77 i

l 1 395 KV LINES 23 kV LINE i

CIRCUITS NORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71 X X X CIRCUITS AVAILABLE PRIOR TO EVENT l OUT IN DURATION OUT lil DURATION OUT _I N DURATION

CIRCulTS INTERRUPTED 1413 2230 32 hr/17 min

/A N/A (1/11)

PARTIAL LOSS! -

Why did some lines not fall when others did? line was isolated i

l TOTAL LOSS!

l If turbine trip occurred, how soon after did loss of offsite power occur? nfg

If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A t

VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVENT (S):

Max Min Rated Duration broken static wire

__ Voltage (KV) cd

->- Frequency (11Z) It!MAltKS: None u

Remarks: Not available u

N CD

~

sheet 27 of 38 PILGRIM UNIT 1 X

f TOTAL l LOSS OF 0FFSITE POWER DATE 1/12/77 345 KV LINES 23 kV LINE i CIRCUITS NORMALLY AVAILABLE LINE #355 LINE #342 LINE #13/71 [

X X CIRCUITS AVAILABLE PRIOR TO EVENT X OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCUITS INTERRUPTED -

10 stic.

N/A N/A -

I PARTIAL LOSSI l Why did some lines not fall when others did? 23 kV line is isolated j TOTAL LOSS!

If turbine trip occurred, how soon after did loss of offsite power occur? N/A If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A l VOLTAGE / FREQUENCY EXCURSIONS C4USE OF EVENT (S):

Unknown Max Min Rated Duration CF

.c::. Voltage (KV) tA Frequency (HZ) REMARKS:

w N Remarks: Not available None

Sheet 28 of 38 PARTIAL X .

PILGRIM UNIT 1 TOTAL LUSS OF 0FFSITE POWER DATE__5/01/77 I 345 KV LINES 23 kV LINE CIRCulTS NORMALLY AVAILABLE LINE #355 LINE #13/71 LINE #342 CIRCulTS AVAILABLE PRIOR TO EVENT X out for maintenance X OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCulTS INTERRUPTED 1437 1508 31 min fl/A N/A PARTIAL LOSS!

Why did some lines not fail when others did? line was isolated i

l i TOTAL LOSS!

If turbine trip occurred, how soon after did loss of offsite power occur? ft/A If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A j VOLTAGE / FREQUENCY EXCURSIONS CAUSEOFEVENT(Sl:

Max Min Rated Duration gg,,est fire m

.c: Voltage (KV) u frequency (HZ) RlHARKS: ggng Remarks: Not available

~

Sheet 29 of 38 PILGRIH UNIT 1 TOTAL LOSS OF 0FFSITE POWER DATE 5/2/77 345 KV LINES 23 kV LINE l CIRCUITS NORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71 X X CIRCUITS AVAILABLE PRIOR TO EVENT X OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCUITS INTERRUPTED N/A 0722 1016 2 hr/54 min N/A PARTIAL LOSSI Why did some lines not fail when others did? relay on isolated line TOTAL LOSSI If turbine trip occurred, how soon after did loss of offsite power occur? N/A If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A CAUSE OF EVENT (S):

VOLTAGE / FREQUENCY EXCURSIONS Max Min Rated Dura tion faulty relay

[ Voltage (KV)

REMARKS:

C Frequency (HZ) y Remarks: Not available None i

N i

Sheet 30 of 38 PARTIAL *!

PILGRIM UNIT 1 TOTAL X LOSS OF 0FFSITE POWER DATE 5/10/77 i

l 345 KV LINES 23 kV LINE i CIRCUITS NORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71  ;

X X X CIRCulTS AVAILABLE PRIOR TO EVENT OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCu1TS INTERRUPTED 0905 1945 9 hr/40 min 0905 1945 9 hr/40 min 0904 1144 2 hr/40 mia i

PARTIAL LOSSI j Why did some lines not fail when others did? N/A l t

TOTAL LOSSI If turbine trip occurred, how soon after did loss of offsite power occur? immediate If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A CAUSE OF EVENT (S).

i VOLTAGE / FREQUENCY EXCURSIONS  !

i I

Min Rated Duration severe sr.Dw storm, ice build up Max

! 4

[ Voltage (KV)

RfMARKS: None

-) Frequency (ItZ) u Remarks: Not available N

4

~

Sheet 31 of 38 PILGRIM UNIT 1 TOTAL ,

LOSS OF 0FFSITE POWER DATE 7/21/77 l t

345 KV LINES 23 kV LINE CIRCUITS NORMALLY AVAILABLE LINE #355 LINE #13/71 LINE #342  ;

CIRCUITS AVAILABLE PRIOR TO EVENT X X X l OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCUITS INTERRUPTED N/A N/A 1853 1853+ 10 sec. l PARTIAL LOSSI Why did some lines not fail when others did? lightning on isolated line TOTAL LOSSI If turbine trip occurred how soon after did loss of offsite power occur? N/A If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVENT (S):

I Max Min Rated buration Lightning  !

j(( Voltage (KV) u REMARKS:

Frequency (HZ)

.ra i rs) Remarks: Not available None Ln

Sheet 32 of 38 PILGRIM UNIT 1 LOSS OF 0FFSITE POWER TOTAL DATE 12/06/77 t

345 KV LINES 23 kV LINE

CIRCUITS NORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71

. CIRCulTS AVAILABLE PRIOR TO EVENT X X X OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCUITS INTERRUPTED 1848 2046 1 hr/58 min N/A N/A PARTIAL LOSS!

Why did some lines not fail when others did? problem uns isolated to line #342 TOTAL LOSS!

If turbine trip occurred, how soon after did loss of off site power occur? N/A If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A VOLTAGE / FREQUENCY EXCURSIONS CAUSEOfEVENT(Sl:

Max Min Rated Duration breM er failure

{

Voltage (KV)

Frequency (HZ) R[ MARKS: None Remarks: Not available a

Sheet 33 of 38 PILGRIM UNIT 1 TOTAL LOSS OF 0FFSITE POWER DATE 1/20/78 345 KV LINES 23 kV LINE CIRCulTS NORMALLY AVAILABLE LINE #355 LINE #13/71

, LINE #342 CIRCUITS AVAILABLE PRIOR TO EVENT X X X OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCulTS INTERRUPTED j 1453 18 27 hr/11 min PARTIAL LOSS!

Why did some lines not fail when others did? isolated equipment failure TOTAL LOSSI If turbine trip occurred, how soon after did loss of offsite power occur? N/A If power was recovered within 10 minutes, was it due to autonutic or manual actions? N/A f

VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVENT (S)

Max Min Rated Duration 100 ft. lightning rod failed during stonn and l

fell into 345 kV switchyard bus

& Voltage (KV) 4 u Frequency (HZ) RIMARKS: None Not available

(~

Remarks:

Sh;et 34 of 38

~

PARTIAL PILGRIM UNIT 1 TOTAL X LOSS OF 0FFSITE l'OuER DATE 2/06/78 345 KV LINES 23 kV LINE CIRCUITS NORMALLY AVAILABLE LINE #355 LINE #13/71 LINE #342 X X X CIRCulTS AVAILABLE PRIOR TO EVENT OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCulTS INTERRUPTED 1933 1411 18 hr/38 min 1933 1407 18 hr/34 min - -

8 hr/54 min (2/7) (2/7) - -

65 min PARTIAL LOSS!

5 Why did some lines not fail when others did? N/A l TOTAL LOSS!

If turbine trip occurred, how soon af ter did loss of offsite power occur? N/A If power was recovered within 10 minutes, was it due to autorikitic or manual actions? N/A i VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVENT (S):

I Max Min Rated Duration severe sitow storm i

i

_m Voltage (KV) ch None w Frequency (HZ) RlHARKS:

'.rJ Remarks: Not available a

fM J

Sheet 35 of 38 ,

PILGRIH UNIT 1 TOTAL  ;

LOSS OF 0FFSITE POWER DATE 7/3/78  !

345 KV LINES 23 kV LINE i CIRCUITS NORMALLY AVAILABLE LINE #355 LINE #13/71 j LINE #342 x X X

CIRCUITS AVAILABLE PRIOR TO EVENT IN DURATION OUT IN DURATION DJT IN DURATION OUT CIRCUITS INTERRUPTED N/A 0113 0253 1hr/40 min ti/A PARTIAL LOSSI Why did some lines not fail when others did? 23 kV line is isolated.

TOTAL LOSSI If turbine trip occurred, how soon after did loss of offsite power occur? N/A ,

If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A CAUSE OF EVENT (S):

VOLTAGE / FREQUENCY EXCURSIONS Max Min Rated Duration differential relay operation

-Voltage (KV)'

cd REMARKS:

yfrequency(llZ)

N08:e j Remarks: Not available r0 4

Sheet 36 of 38

^

! PILGRIM UNIT i TOTAL

- LOSS OF 0FFSITE POWER DATE 8/06/78 I

l I

I 345 KV LINES 23 kV LINE CIRCUITS NORMALLY AVAILABLE LINE #355 LINE #13/71 LINE #342

! CIRCUITS AVAILABLE PRIOR TO EVENT X X X OUT IN DURATION OUT IN DURATION OUT IN DURATION CIRCUITS INTERRUPTED 1153 1215 22 min 1153 1215 22 min N/A PARTIAL LOSSI Why did some lines not fail when others did? 23 kV 1ine is isolated lines #342 & #355 share coninon transmission towers TOTAL LOSS!

' If turbine trip occurred, how soon af ter did loss of of fsite power occur? N/A If power was recovered within 10 minutes, was it due to autoiiiatic or manual actions? N/A I

I VOLTAGE / FREQUENCY EXCURSIONS CAUSE OF EVENT (S):

Max Min Rated Duration lightning I

i

- Voltage (KV)

Ch

_s:> Frequency (llZ) REMARKS: None v4 Remarks: Not available v4 V4 CD

Sheet 37 of 38 .*

PARTIAL X ,

PILGRIM UNIT 1 TOTAL LOSS OF 0FFSITE POWER DATE 7/27/79 l 345 kV LINES 23 kV LINE

! CIRCUITS NORMALLY AVAILABLE LINE #355 LINE #13/71 LINE #342 j

X X X CIRCulTS AVAILABLE PRIOR TO EVENT l

OUT IN DURAT10fl OUT IN DURATION OUT IN DURATION CIRCulTS INTERRUPTED 0102 0116 14 min 0102 0116 14 min N/A i PARTIAL LOSSI Why did some lines not fall when others did? 23 kV line is isolated t

TOTAL LOSS!

If turbine trip occurred, how soon af ter did loss of of fsite power occur? N/A If power was recovered within 10 minutes, was it due to automatic or manual actions? N/A VOLTAGE / FREQUENCY EXCURSIONS CAUSE Of EVENT (S):

Max Min Rated Duration lightning

{ Voltage (KV)

Frequency (ItZ) RIt1 ARKS: tione u

u Remarks: Not available 6

Sheet 38 of 38 -~

~

PILGRIM UNIT 1 LOSS OF OFFSITE POWER TOTAL DATE 8/28/79 i

i t

345 KV Lit 1ES 23 kV LINE

, CIRCUITS HORMALLY AVAILABLE LINE #342 LINE #355 LINE #13/71

! CIRCUITS AVAILABLE PRIOR TO EVENT X X X i

OUT IN DURAT10ft OUT lll DURATION OUT IN DURATION CIRCUITS INTERRUPTED 0030 0046 16 min 0030 0046 16 min N/A PARTIAL LOSSI Why did some lines not fail when others did? 23 kV line is isolated l TOTAL LOSS!

If turbine trip occurred, how soon af ter did loss of offsite power occur? N/A If power was recovered within 10 minutes, was it due to autonatic or manual actions? N/A i

VOLTAGE / FREQUENCY EXCURSIONS CAUSE Of EVENT (S):

[ Max Min Rated Duration lightning Q Voltage (XV) g frequency (NZ) REMARKS: None u Remarks: Not available u

N

+

~*

ATTACHMENT C Sheet 1 of 1 DETAIL SPECIFICATION NO. 5888 FOR THE MODIFICATION OF THE PILGRIM LOOP 345kV LINES NO. 342 AND NO. 355 1.0 SCOPE This work consists of furnishing all supervision, labor, tools, equipment aad supplies required for and incidental to the following:

1.1 Install " fog-type" disc insulators on all structures f rom Route 3A to the Pilgrim Station Switch Yard, structures 40 through 48 and the station bridges.

These structures are on our right-of-way #15, all within the Town of Plymouth, or within the Station #650 fence. This work consists of:

1.1.1 The removal of 18-20,000 lbs. M&E, disc type insulators per string en 5 tangent towers and replacing them with 18 " fog-type", 30,000 lbs. M&E, disc insulators.

1.1. 2 The removal of 18-30,000 lbs. M&E, disc type insulators per dead-end string en 4 dead-end structures and replacing them with 22 " fog-type", 30,000 lbs.

M&E, disc insulators.

1.1. 3 Install cne 19b" Idler Strut Section into all existing Idler 5trut Insulater Assemblies.

1.2 Install 4 new 30,000 lbs. M&E, disc type insulators in each dead-end string to increase the total insulatica level from 16 discs to 22 discs.

1.2.1 Structures involved (all on R/W #15, Plymouth):

3 ridges (Jordca Rd & State Forest) 22

1. 1 25

1. 4 20

1. 9 32

1. 16 35

1. 17 37 1.2.2 This work will require the installation of new dead-end ccepression fittings en both sides of most structure (The exceptions are spans between the bridges and structures 1,16 and 17) and the lengthening of all jumper loops.

1.3 Rotate the phases of circuits No. 342 and No. 355 in acecrdance with drawing S4667. This work should be coordinated with the work described in sections 1.1 and 1.2 such that duplicate ccmpressions are unnecessary. This work will also require the simultaneous outage of both circuits. Structures involved are the bridges (2) at State Forest, structure #1, #16, bridges (4) at Jordan Rd, structures #17, 46, 47, 48 and the bridges (2) at Pilgrim Station.

4 i

1643 333