ML20034C784

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Issue 57 to Abnormal Operating Procedure AOP-P, Loss of DC Bus
ML20034C784
Person / Time
Site: Fort Saint Vrain Xcel Energy icon.png
Issue date: 04/19/1990
From:
PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20034C092 List:
References
AOP-P, NUDOCS 9005100050
Download: ML20034C784 (10)
v • d • e


Text

,

-.1 AOP-P Issue 57.

Public -

FORT-ST VRAIN NUCLEAR GENERATINQ STATION Page 1-of-2 z-TIT E LO S OF A B'

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AUTHQlZEO

'i BY

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@,C PORC 8 7 7 APR 111990

[#7'V" q q gw DCCF

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NUMBER (S) 4O'- OI 44 -

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FT. ST. VRAIN I

NON-CONTROLLED COPY VERIFY ISSUE STATUS I

WITH SITE DOCUMENT CONTROL CENTER PRIOR TO USE O..

9005100050 900427

{

DR ADOCK 050 7

' FORM (D)372 22 3842 --

I*.

l.

~AOD-P

~ Issue 57:

3-Pubile

- FORT ST.- VRAIN NUCLEAR GENERATING STATIO4d9e.2 of 2 service

Pusuc sanvoca cOasPANY OF COLORADO :

O

.'(P)

LOSS OF A DC BUS SYMPTOM-ACTION MATRIX l

l l

i l

' SYMPTOMS l

li i

l l-1 I

.'l l

ACTIONS:

l-1.1 1

1.2 i

j l

l DC Bus Undervoltage l DC Bus Undervolt' age

.l l I-06F.2-5 BUS 1 l I-06F 2-5'-

BUS 2-l~

I l-(EI-92220) l (EI-92221):

I I

I

'l

'I I

1 I

I l OPERATOR ACTION

,l

-l l

l-I l.2.1 I

l l

l Dispatch operator to l

'l l

1 l reclose supply breaker l XX l

XX l

l l to affected. bus

-l l

l

.I I

I I

i l. 2.2.

-1 l

-l l I_F the affected DC Bus) l l

l cannot be reenergized.1 l

l-

,9 1

l THEN transfer the DC l l

j.

l feeds to the non-l XX XX

.l XX XXL l

.l affected bus at the l'

_l

-l:

l local transfer switch l l

l l (see Table P.5) l I

j, I

I I

l I

I l-l l

l l 2.3 l

l l

l Refer to Table P.4, l_

l 1l l " Loss of DC Bus" for i XX XX l

XX-XX l

I the effect of a loss l 1

l-l to each bus l

l-l I

I I

l l

FORM (D)T12 22 3643 i

.-.--..i-...

l, A0P APP P' Issue 57' h Public -

FORT ST. VRAIN NUCLEAR GENERATING STATIOlijage 1 of 2 V07 Service

  • Pusuc ssRvecs COMPANY OF COL.ORADO fy.

.U INTRODUCTION Two separate 125 Volt D.C. busses provide operating power to the following:

a.

4160 and 480 Volt switchgear and main control room. panels.

.b.

Two instrument power inverters.

c.

Emergency hydrogen seal oil pump.

f d.

Turbine generator emergency bearing oil pump EHC supply, e.

Boiler feed pumps emergency lube oil pump. BFP tripping capability, SV7, MSC, and recire. valves, f.

Circulating water pumps discharge valves, g.

Various control relays.and emergency. lighting.

h.

Turbine - Generator _EHC System.

i.

Generator and transformer protection lockout relays.

  1. ~ A j.

Undervoltage relays.

U k.

Auto start prohibit and tripping relays (loss of outside-power).

I +

l 1.

Main steam electromatic relief valves, m.

Fire alarms (I-06).

The 125 Volt D.C. Busses receive their power from two 480 Volt A.C; Essential Busses via battery chargers, which provide the O.C. supply l plus charging the station batteries. They also supply three instrument busses through DC-AC inverters.

I O

V i-ronutoisn zz aua

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-AOP APP P=

Issue 57

'A Public FORT ST..VRAIN NUCLEAR GENERATING STATIOAage 2 of 2.

W Service

DISCUSSION OF SYMPTOMS.

SYMPTOMS 1.1 D.C. Bus Undervoltage BUS 1 1-06 F 2-5 (EI-92220h 1

1.2 D.C. Bus Undervoltage BUS 2 1-06 F 2-5 (El-92221),

i D.C. Bus 1 and D.C. Bus 2 undervoltage conditions will be alarmed on I-06F 2-5.

This alarm is common for both Bus 1 and Bus 2..

By observing the voltmeters on 1-06 El-92220 (Bus 1) and EI-92221 (Bus 2) the operator may readily identify the faulty bus.

1

~ OPERATOR ACTION j

i l

2.1 Dispatch operator to reclose supply breaker to affected l

bus.

1 If a momentary fault has caused the supply breaker to-trip, it may be possible to reenergize the bus by i

reciosing the supply breaker. The D.C. Bus 1 and Bus 2 supply breakers are located in the Auxiliary Electric Equipment Room. No attempt should be made to use the bus tie until it is determined that the bus is free of faults.

I 2.2 IF the affected D.C. bus cannot be reenergized THEN transfer the O.C. feeds to the non-a_ffected bus at the local transfer switches (see Table P.5).

The 4160 Volt switchgear and main control boards are-supplied from 125V D.C. Bus 1 and Bus 2.

One of these busses is either a main or alternate source of power.

In the event of a failure of the main source of power, the alternate source may be selected. Equipment for which transfer capability is provided is listed in Table P-5.

l 2.3 Refer to Table p.4, " Loss of D.C. Bus" for effect of loss of effected bus.

Table P.4 shows the effect of a loss of a D.C. Bus on plant equiptrent. It also lists the main and alternate t

sources of D.C.' power for the switchgear and control.

panels.

e 1

FORM (DI272 22 3643

a l.

AOP Table P.42 Issue 57-Public FORT-ST. VRAIN NUCLEAR GENERATING STATIOdage 1 of 2 SOfVICO'-

Pusuc sanvoca COMPANY OF COILORADO.

TABLF P.4 LOSS OF D.C. BUS l.

I EFFECT OF LOSS l

_EFFECT 0F LOSS l

'l,

l FUNCTION l

0F D.C. BUS 1 l

OF D.C. BUS 2 l

NOTES-l-

l l

l l

l 1l i

1 I

i-ISWITCH YARD l Switching capabilityl0ne of~two trip l

l l

l impaired. One of Icoils lost. Switch-l l

l Itwo trip coils lost.ling-voltage-is sup-l _

1 l

l Pull main supply qplied from D.C.

l l.

l-Ifuse block in "A" l Bus 1.

l l

l l panel, close tie l

l l-

-l l breaker in "B" panell l

l l

land "A" panel. '

I I

l-1 I

I I

I l

1 l

I l

14160 V BUSES ILose all switching INo'effect,L4160 l

l l

lon 4160 Busses IBusses, res., aux.

l l

l lincluding res, aux land unit aux', trans.1 l

l land unit aux trans.lNormal feed is from'l l

l l switching. This is ID.C. Bus 1.

l l

l l normal supply.

I l

l 1

-l Throw switch to D.C.l l

l l

l Bus-2 in I-15 and l

l l

l l4160 busses.

I l

=l l

1 I

l

_l l-1 I

I i

1480 V BUSES INone-Auto transfer lNone-Auto transfer I l'

l lto DC Bus 2 Ito DC Bus 1 l

l 1

I I

I I

l-I-

l IDIESEL GEN.

lD-G start and ID-G start and l

l l

lswi n hing cap. Lost 1 switching cap. Lost l-1 l

Ito D-G Set "1A".

ito D-G Set "1B".

l l

l l

l I

1.

l1 I.

l l

l l INSTRUMENT'BUSiloss of Inverter ILoss of Inverter I

1 l

lsupply, transfer to Isupply, transfer to l l

l

-lInstrument Power IInstrument Power l

l l

l Transformer 1 ITransformer 2 l

l l

I I

I I

I l

1 I

l l DATA. LOGGER INo effect-l Loss of' inverter, I

I l

l lautomatic transfer I l.

l I

lto AC backup.

l l

I I

l I

'l 1

i FORM (ol 372 22 + 3643

a l-A0P Table P.4' Issue 57

A Pubilk

FORT ST. VRAIN NUCLEAR' GENERATING STATIO@ age 2' of. 2

%F Service *:

pusuc sanwes COMPANY OF COLORADO I

TABLE P,4

\\

LOSS OF 0.C. BUS l

l EFFECT OF LOSS l-EFFECT OF LOSS l-l l

FUNCTION

- l' 0F 0.C. BUS 1

- l OF D.C. BUS l NOTES l

l l

l-l I

1 1

I

. I i

l CONTROL BOARDS lSee listing cf ISee listing of I

l l

'lcontrol board feeds.'l control board feeds l l

t l

l Table P.6

. l Table P,6 l'.

.l 1

l l

1 I

- l

-l l'l l

l

. All l

. l-ILOSS OF INo effect. All lNo effect.

1480 VOLT ESS. lundervoltage relays -lundervoltage relays l l

1 l POWER RELAYS lwill remain operable lwill remain operablel l

l ldue to auto switch-ldue to auto switch-l l

l1) Degraded ling of DC supply on.ling of DC supply on'-l l.

l l

Voltage la loss of a DC Bus. la loss of a DC Bus. I l

l 1

. I l'

I l2) ATO l

l

' I I

I l

I l.

-l

\\

l I

I l

1:

l I

l l

l l3) Loss of I

l l

'l l

Voltage - l l

l

'l l

DG Start, l

l l

l l

Load Shed, I l

l l

l and Sequen-l l

l l

l cing l

l l-1 I

I I

I I

I l4). Loss of I

l

- l l

I Voltage - l l-l l

Reactor l-l l

l l

Scram l

l l

j l

i I

I I

i

%/ ~

FORM (D)372-22 3643 m-

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b r a-

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l-AOP Table: P.5 ~

2-Issue 57 Pubil3 FORT ST. VRAIN NUCLEAfi FENERATING STATIOM981 Of I

~

Le~

$9FVIC9' Pusuc senvoca COMPANY OF COLORADO

~

i TABLE P.5

(

LISTING OF' PREFERRED D.C. BUS f

' PREFERRED BUS EQUIPMENT D.C. BUS 1 D.C. BUS 2

-Main. control Board I-05 X

Main-Control Board I-15

-X j

Term & Aux Riy. Cab I-63 X

Term. & Aux R1y. Cab I-64 X

Term. & Aux R1y Cab I-66 X

480 Volt Bus 1 X

480 Volt Bus 2 X

480 Volt Bus 3 X

480 Volt Bus 4 X

480 Volt Bus 5 X

480 Volt Bus 6 X

480 Volt Bus 7 X

t i

4160 Volt Bus 1 X

4160 Volt Bus 2 X

4160 Volt Bus 3 X

f 4 :.

4 L

V,0 i

Y

?

FORM (ol372 22-3643 2

i s

(

y vu

  • m--

.w-,

AOP Table'P.6-f*

l?

-Issue 57-A Public.

FORT ST. VRAIN NUCLEAR GENERATING [S(ATIONPage l'of 3-i

%)F Service

  • Pusuc sanvece comeAmy or cotonAoo

(y V-TABLE P.6

'125V D.C. FEEDS VIA MAIN CONTROL BOXRDS AND AUXILIARY RELAY CABINETS

+

1-05 (TRANSFER SWITCH) ll FROM DRAWINGS.E-1333 and E-1334 1.-

Relief Valve PV-22167 Loop l' 3

2.

Relief Valve'PV-22168, Loop 2 3.

I-70 Alarm Bell l

I-06 125V D.C.

FROM DRAWINGS E-1377 AND E-1351 l

BUS 1 l

BUS 2 l

l 1-1 I

I i

l Alarm Horn I^ Low air pressure alarm l l

l-(deluge' systems for' l-

! pg l~MCC breaker position

-l main, aux, and reserve-I-

"V l lights i transformers, l-l l

l I Fire Alarms l

l Fire Ala,rms' l

- I.

J l Turb lube oil reservoir lP-3101 lube oil reservoirl

[

l Lube oil storage rm I

l.

l Helium Cire turntable lH. seal oil unit l_

l l Aux bir l

l g

~

I P-3103 Lube oil reservoirl l

t s

t'

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,, t37 a

6 t

I

. FORMIDI372 22 3643

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,AOP Table P.6 Issue 57

' A Public-FORT ST.'VRAIN NUCLEAR GENERATING STATIOM99 2 Of 3 107 Service

O TABLE P.'6 125V D.C. FEEDS VIA MAIN CONTROL BOARDS AND AUXILIARY RELAY 1ABINE'fS i

1-15 (TRANSFER SWITCH) j FROM DRAWING E-1392 1.

Res Aux Transformer Trip Relays 86 RT.

2.

Gen & Trans Aux Tripping Relays 86 GTI.

3.

Res-Aux Deluge Valves 86 RTD.

4.

Main & Unit Aux Deluge Valves 86 MVD.

5.

Unit Aux. Trip Relay 86TI (XRA-92128).

6.

Gen 1 Aux Tripping Relay 86 GI (XPA-92122),

d 7.

-Gen Di N Aux Trip R1y 86 DID (XRA-92121)..

8.

Fire Protection Sys Riser VA Alm Cbts.

9.

Main Trans Aux'Rly CR-9213.

.i 10.

Fire Protection Sys. Deluge Valves for Main Unit, Aux & Reserve Aux Deluge Valves.

11.

Unit Aux Trans Seal-In R1ys.

i i

Not on the transfei switch are the auto start prohibit and tripping relays which actuate on loss of 480 Volt j

Essential Bus.

-l I-63 (TRANSFER SWITCH)

FROM DRAWING E-1478 i

1.

4160 V Bus-1, 2 & 3 Undervoltage T

Rly Dev 127-1, 2 &'3.

2.

Rx. Pl. Ventilation System j

'Rx Pl.. Chilled Water Selector 3.

Cire. Wtr. Make-Up Pump 1A Power =

for TR-4101 to HV-4108-4.

Cire. Wtr. Make-up Pump 1B Power for TR-4103 to HV-4110 5.

BFPT 1A Trip Signal Relay CR-3108 6.

125V D.C. 1A Undervoltage Relay 7.

Turb Bldg HVAC Sys Panel I-7503X i

i O

i FORM (Dl372 22 3643

,4:-

- ll A0P Teble P.6 Issue 57 Public -

FORT ST. VRAIN NUCLEAR GENERATING STATIO$ge 3 of 3 SOfVICO'

' PusuC sanVICE CONIPANY OF COLORADO TABLE P.6 n

125V D.C. FEEDS VIA MAIN CONTROL' BOARDS AND AUXILIARY RELAY CABINETS I-64 1.

Rx Pl. Ventilation System-Chilled Water Selector 2.

BFPT 1C Trip Signal Rly'. CR-3109 i

1 1-66 (TRANSFER SWITCH)

FROM DRAWING E-1509 1.

Rx. Pl. Ventilation. System j

Chilled Water Selector 2.

CO Alarm System 2

3.

Rx. Pl. Exhaust Filter 1A (F-7301)- Fire Protection System-4.

Rx Pl. Exhaust Filter 1B (F-7302) Fire Protection System-5.

Rx. Pl. Exhaust Filter 1C (F 73025) Fire Protection System 6.

Fire Extinguishing Sys 45 (DG's) 7.

Feed to Rx Pl.-HVAC Pnl-(I-7301)

-l 8.

Feed to Cont. RM HVAC Pn1 I-7501X i

1-09 Q25V D.C.-BUS.}

2.

Main Generator RTO Tempe-ature Readout.

j 1.

Annunciator Feeds to I-09 & Chemical Building,

\\

i l

l i

' t FORM (Did2 27 -3643 4

~1 A

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