ML20034C782

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Issue 57 to Abnormal Operating Procedure AOP-L, Loss of Instrument Air Header
ML20034C782
Person / Time
Site: Fort Saint Vrain 
Issue date: 04/19/1990
From:
PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20034C092 List:
References
AOP-L, NUDOCS 9005100047
Download: ML20034C782 (11)
v • d • e


Text

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l AOP APP K-2 Issue 56 PubilC FORT ST. VRAIN NUCLEAR GENERATING STAflON "9' 0

SerVICO' Pusuc saRv6ca COMPANY OF COLORADO I

l 2.3 Monitor Critical Safety Functions Per E0P's.

l.

Monitor critical safety functions per E0P's and take any I

steps required by E0P's, l

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Issue 57

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Pub!Ic FORT ST VRAIN NUCLEAR GENERATING STATION Page 1 of 3' b

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  • h resuc senvoca conwamy or cotenano TITLE:

LOSS OF AN INSTRUMENT AIR HEADER

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Issue 57 Page 3 of 3 a -

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LOSS OF AN INSTRUMENT AIR HEADER SYMPTOM-ACTION MATRIX i

I l

I I

I SYMPTOMS I

I I

I I I I

l.1 1

1.2 8

1.3 1

1.4 5

I I I

Inst. Ai r Pressure I

inst. Ai r Heade r I

inst. Air Header 8 Loss of both Inst.

I I I ACTIONS I

Low 1

"A" Pressure Low I

"8" Pressure Low I a i r headers I

l 8 I

l-06H, 2-6 I

I-06 ( PI-8212)

I l-06 (PI-82 Sis) i I

II I

I I

I I

I I I

I I

I e

i I b)

I I

I I

I I Close V-82524 and V-82885 8 I

I XX I

i

1. I to isolate Reactor I

I i

I I

i i Building "B" header i

i I

8 I

I I I

I I

I I

II c)

I I

I I

i l I Close V-826fs and V-82883 I I

XX l

i I

I I to isolate Turbine i

I I

I I

I I Building "A" header I

I i

I I

l 1 8

1 i

I I

l i d) 1 I

I I

I II close V-8255 and V-82886 8 I

I XX 1

1 I I to isolate Turbine I

i i

I I

I i Building "B" header I

i i

I I

I I I

I I

I I

I I 2.7 I

I I

I I

II If header pressure is 1

1 XX 1

XX-1 I

l 8 regained, leave portion i

I I

I I

I I containing leak isolated i I

I I

I I I I

I I

I I

i 1 NOIE:

THE FOLLOWING ACil0NS ARE REQUIRED ONLY IF CONIPJL VIA THE AFFECTED AIR DlEADER HAD BEEN LOST I

I I I II OPERAIOR ACTIONS I

I I

I I

I I 2.8 8

I I

I 1

l 8 Shutdown auxiliaries, I

I I

I I

I I inc lud ing bea ring wa te r i

i I

XX l

I l 8 ptemps and isolate surge i

I I

I I

I I tank level valves I

I i

8 I

I I I

I I

I I

I I 2.9 8

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i I

l 8 Pas t reactor building sump 1 8

8 XX.

I I

I'I pumps in PULL-TO-LOCK I

I I

I I

I I

I I 8

I I ~

8 I

I I 2.30 1

I l'

l 8 Refer to TABLES L.3 and i

I I

I I

II L.84 for efTect of loss of I I

XX XX l

XX XX 1

8 I I air and valves backed i

I I

I I

I I with nitrogen i

I I

I I

l 8 I

I I

I I

l AOP APP L Issue 57 A Public FORT ST. VRAIN NUCLEAR GENERATING STATION age 1 of 8 P

9G7 Service

INTRODUCTION l Each loop in this plant has a complete instrument air supply system consisting of an instrument air compressor, air af tercooler, air accumulator, air dryer, and distribution header. In addition, there is a spare instrument air compressor that should start automatically and furnish air for either loop in case the primary compressor is shutdown because of trouble or for maintenance. The service air compressor may also be used to furnish instrument air to either loop of the instrument air system. The service air can be incroduced into either system just ahead of the system air accumulator, ahead of the system air dryers, or downstream of the system air dryers in case these components are also out of service.

Instrument air header "A" furnishes air to the Loop 1 instruments and header "B" furnishes air to the Loop 2 instruments.

DISCUSSION OF SYMPTOMS ALARMS AND INDICATIONS 1.1 Instrument Air Pressure Low, I-06H 2-6 When the pressure in either instrument air header drops below 70 psig, the alarm sounds and the window in the alarm panel lights.

NOTE: Operators, in most cases, will have been alerted to trouble prior to reaching this pressure.

1.2 Instrument Air Header "A" Pressure low, I-06 PI-8212 1.3 Instrument Air Header "B" Pressure Low, I-06 PI-8254 In order to identify which header has the low pressure, the meters on the control board must be checked.

DISCUSSION OF OPERATOR ACTION l

2.1 Terminate Defueling Activities i

Until instrument air headers are restored, terminate I

defueling activities and close all openings to PCRV.

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FORM (D)372 22 3643

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l AOP APP L Issue 57 A Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 2 of 8 107 Service

l 2.2 Ensure standby compressor starts and alienment to affected header.

At 85 psig, ensure backup Instrument Air Compressor starts. Operator should then ensure compressor is delivering to the affected header by observing the pressure indicators on I-06, and placing HS-8219 or HS-8220 in the proper position.

1-2.3 Ensure appropriate Service Air backup to affected header.

At 80 psig, ensure service air backup is going to the affected header; FSV-8218 for "A" header and FSV-8255 for "B" header.

At 75 psig, ensure dryer is bypassed.

i At 70 psig, ensure Service Air backup downstream of dryer is open; FCV-0217 open and FCV-8218 closed for "A" header; FCV-8221 open and FCV-8255 closes for "B" header.

l 2.4 IF 60 psia and decreasing, set helium circulator brake and seals.

At 60 psig and still decreasing pressure, control will soon be lost to most of the controllers in the affected l

loop. At 50 psig the Service Air backup will automatically be isolated from the affected air header.

Some of the more critical control services have backup i

operating media which will last for a limited period of l

time. The proper action, therefore, is to isolate the I

coolant loop serviced by the affected header. Loop #2 is isolated by HS-93334 and HS-93336. The helium circulator brake and seal are set to prevent primary coolant leakage and moisture inleakage.

I 2.5 Dispatch operators to identify the leak source and isolate if possible.

With below normal air header pressure, the source of the problem should be determined and corrected if possible.

FORM ton 372 22 3643 1

l AOP APP L Issue 57 i

OPubil3 FORT ST. VRAIN NUCLEAR CENERATING STATIONpage 3 of 8 Service

(

r CAUTION:

THE FOLLOWING STEPS ARE TO BE PERFORMED ONLY l

IF: AIR HEADER PRESSURE HAS BEEN LOST, AND THE l

LOOP ISOLATED.

4 l

The remainder of this abnormal procedure assumes there has l

been a major breach in an air header line. As such the remaining steps deal with leak source identification and l

1 solation.

l 2.6 Isolate portion of affected header and determine if header.

pressure regained.

I a)

Close V-8265 and V-82884 to isolate reactor I

building "A" header.

b)

Close V-8254 and V-82885 to isolate reactor l

building "B" header.

c)

Close V-8264 and V-82883 to isolate turbine l

building "A" header.

i d)

Close V-32E5 and V-82886 to isolate turbine building "B" header.

l 2.7 If hader pressure regained. leave portion containing leak i so(4ted.

CWing air header isolation valves should be an effective mans of locating the portion of the header containing the leak and also an effective means for isolation. There are l

local pressure gauges at each of the isolation valycs.

Isolation of a portion of the header containing the leak will minimize subsequent operator actions required for control of the plant.

I NOTE: THE FOLLOWING ACTIONS ARE REQUIRED ONLY IF CONTROL VIA THE AFFECTED AIR HEADER HAS BEEN LOST.

l The following steps of this abnormal procedure are necessary only to the degree instrument air for control of the equipment has been lost. This will depend upon the-air header affected and that portion which has been isolated.

FORM (D)372 22 3643 s

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l AOP APP L-a Issue 57 A Public FORT ST. VRAIN NUCLEAR CENERATING STATIONPage 4 of 8 MGF Service

l 2.8 In affected loop, shutdown auxiliaries, including bearing water pumps and isolate surge tank level valves.

l Control of the loop has been lost with loss of the l

associated instrument air supply.

l 2.9 Put reactor building sump pumps in PULL-TO-LOCK.

HV-7204-1 is on "B" header and fails open. The Reactor Building Sump Pumps should be put in pull-to-lock to avoid

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filling the liquid waste system.

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l 2.10 Refer to Tables L.3 and L.4 for effect of loss of air and I

valves backed with nitrogen.

These tables provide a listing of these controllers which are affected by a loss of air pressure, their failure modes, emergency backup provisions, and those controllers which have backup emergency nitrogen supply, j

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I AOP APP L Issue 57 Public FORT ST. VRAIN NUCLEAR GENERATING STATIONPage 5 of 8 SONICe*

Pusuc sanvoca coa 4PANY Os COLORADO O

TABLE L.3 LOSS OF AN INSTRUMENT AIR HEADER EFFECT OF LOSS ON l EFFECT OF LOSS ON l FUNCTION "A" INST. AIR "B" INST. AIR l

NOTES HEADER HEADER l

l l

l l

NOTE: (FO) = Fails Open (FC) - Fails Closed Normal Bearing l LV-2135-1 (FO) l LV-2136-1 (FO) l Shut down becrir,

Water System l LV-2135-2 (FC)

I LV-2136-2 (FC) l water pumps ar.u lHas backup air for lHas backup air for l isolate level l1 hour and manual l1 hour and manual icontrol valves on Ishutoff valves.

l shutoff valves.

l loss of backup l

l lair supply.

I I

l l Recycle valve l Recycle valve IProduces helium l FV-21297 (FO) l FV-21298 (FO) l circulator trip I

l(Lossofbearing I

l l Water due to O.

Isimultaneous l

1 failure of backup L

I lbearing water l

l lsupply.

I I

l l

Bearing Water l PDV-21285-1 (FO) l POV-21286-1 (FO)., Failure of normal Accumulators l PDV-21285-2 (FO) l PDV-21286-2 (FO) land backup bearing l Backup air for l Backup air for Iwater fires the 1 5 minutes, I 5 minutes, laccumulator.

I I

I Buffer Helium lHV-2366-1(FO) l POV-23111 (FC) l Supply l

l Has backup air forl I

l 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> l

l l HV-2366-2 (FC) l I

I l

l PDV-2367-1 (FC) l l

l Backup air 1

i l

l I

Low Pressure l Lose normal drain l Water drains to l

Separator Drainst LV-21115 (FC)

I turbine water i

I Drain to turbine I drain tk. LV-211191 l water drain tank. l (FO) l l

l l

0 FORM 101372 + 22 3843

l AOP APP L Issue 57

& Public FORT ST. VRAIN NUCLEAR GENERATING STATION age 6 of 8 P

NGF Service

  • Pusuc senvece courmv or cotonAoo p,

TABLE L.3 LOSS OF AN INSTRUMENT AIR HEADER l EFFECT OF-LOSS ON l EFFECT OF LOSS ON l FUNCTION "A" INST. AIR l

"B" INST. AIR

'l NOTES 4

l HEADER l

HEADER l

l l

l 1

NOTE: (FO) = Fails Open (FC) - Fails Closed a

l Turbine Water l LV-21130 (FO) l LV-21114 (FO)

Drain Tank l Has backup air forl Turbine water re-l j 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and hand-l moval pumps cycle.

I jack.

I LV-21130 operates l l

l normally (opens on l

l high level).

l l

l l PV-21120 (FO) Has 1

l l backup air for l

l l 1 hr and handjack.l l

l l

l s

Flash Tank Drain l LCV-321B (FC) l LCV-3217-2 (FC) 10n loss of either System l LCV-3217-1 (FC) l HV-3220-1 (FC) l header operation l LCV-3217-2 (FC) l HV-3220-6 (FC) lis via emergency I Because XEP-3217 l l drain path. On J

l loses supply air. I l loss of "A" header 1 LCV-3251-1 (FO) l lonly controlling l LCV-3251-2 (FO) l l valve is HV-3250.

1 I

i 150 psig HDR l PCV-5201 (FO) l PCV-5214-1 (FO) l Loss of "A" HDR Valves l HV-5202-2 (FO) l PCV-5214-2 (FO) l requires local I HV-5211-1 (FO) l PCV-5214-3 (FO)

Imanual control if l HV-5211-2 (FO) l (Flow to Close) l aux boiler is on.

l l HV-5202-1 (FO)

~lloss of "B" HDR J

l l HV-5203-1 (FO) l requires local l

l kV-5203-2 (FO) l manual control of I

l 15214 valve station.

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v FORM (Ol372 22 3M3 s

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A0P APP L Issue 57 A Public FORT ST. VRAIN NUCLEAR GENERATING STATION age 7 of 8 P

47 Service

TABLE L4 VALVES BACKED UP WITH NITROGEN Valve Number Function Failure Mode HV-2187-1 Circulator 1A Bearing Service Isolation Open HV-2187-2 Circulator 1A Bearing Service Isolation Open HV-2187-3 Circulator 1A Bearing Service Isolation Open HV-2187-4 Circulator 1A Bearing Service Isolation Open HV-2187-5 Circulator IA Bearing Service Isolation Open HV-2187-6 Circulator IA Bearing Service Isolation Open HV-2187-7 Circulator 1A Bearing Service Isolation Open HV-2187-8 Bearing Water Accumulator Circulator 1A Open LV-21303 Circulator IA HP Separator DR (Manual)

Closed HV-2188-1 Circulator 1C Bearing Service Isolation Open HV-2188-2 Circulator 1C Bearing Service Isolation Open HV-2188-3 Circulator IC Bearing Service Isolation Open HV-2188-4 Circulator IC Bearing Service Isolation Open HV-2188-5 Circulator 1C Bearing Service Isolation Open HV-2188-6 Circulator IC Bearing Service Isolation Open HV-2188-7 Circulator 1C Bearing Service Isolation Open HV-2188-8 Bearing Water Accumulator Circulator 1C Open LV-21304 Circulator 1C HP Separator DR (Manual)

Closed HV-2189-1 Circulator IB Bearing Service Isolation Open HV-2189-2 Circulator IB Bearing Service Isolation Open HV-2189-3 Circulator IB Bearing Service Isolation Open HV-2189-4 Circulator 1B Bearing Service Isolation Open HV-2189-5 Circulator 1B Bearing Service Isolation Open HV-2189-6 Circulator IB Bearing Service Isolation Open HV-2189-7 Circulator IB Bearing Service Isolation Open HV-2189-8 Bearing Water Accumulator Circulator 1B Open HV-2190-1 Circulator 10 Bearing Service Isolation Open HV-2190-2 Circulator 10 Bearing Service Isolation Open HV-2190-3 Circulator 10 Bearing Service Isolation Open HV-2190-4 Circulator 10 Bearing Service Isolation Open HV-2190-5 Circulator 10 Bearing Service Isolation Open HV-2190-6 Circulator ID Bearing Service Isolation Open HV-2190-7 Circulator 10 Bearing Service Isolation Open HV-2190-8 Baaring Water Accumulator Circulator ID Open LV-2135-1 Makeup Bearing Water Surge Tank 1A Open LV-2135-2 Drain Bearing Water Surge Tank 1A Closed LV-2136-1 Makeup Bearing Water Surge Tank 1B Open LV-2136-2 Dra n Bearing Water Surge Tank 1B Closed i

O LV-21130 TWDT Drain to Reactor Building Sump Open FORMIDI372 22 3843

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l AOP APP L Issue 57 age 8 of 8 i

M Pu bilC FORT ST. VRAIN NUCLEAR GENERATING STATION

%)F Service

  • rusuc sanvoca comramy or cotonAno TABLE L.4

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VALVES BACKED UP WITH NITROGEN I

1 I

Valve Number Function Failure Mode PDV-21285-1 Loop 1 Bearing Water Accumulator Open i

PDV-21285-2 Gas Pressurizer-1A Outlet Open PDV-21286-1 Loop 2 Bearing Water Accumulator Open PDV-21286-2 Gas Pressurizer IB Outlet Open b

HV-21277-1 Equalizing Line T-2110 Closed HV-21277-2 Equalizing Line T-2110 Closed HV-21277-3 Equalizing Line T-2110. Vent Open HV-21415-1 Loop 1 Accumulator Gas Pressure Closed i

HV-21415-2 Loop 1 Accumulator Purge Block Closed HV-21416-1 Loop 2 Accumulator Gas Pressure Closed HV-21416-2 Loop 2 Accumulator Purge Block Closed r

PV-21120 Turbine Water Drain Tank Vent Open LV-21130 Turbine Water Drain Tank Level Valve To Open p

Keyway V

PDV-2367-1 Buffer Makeup from Helium Storage Closed-PDV-23111 Helium Purification Flow Closed ~

LCV-3175-1 Deareator Level Control Open PV-22153 Loop 1 Stm/ Gen Depress (Manual)

Closed PV-22154 Loop 2 Stm/ Gen Depress (Manual)

Closed DV-73453 Rx Plant Exhaust Fan 1A In (Manual)

Closed DV-73454 Rx Plant Exhaust Fan IB In (Manual)

Closed DV-73455 Rx Plant Exhaust Fan 1C In (Manual)

Closed DV-73456 Rx Plant Exhaust Fan 1A Out (Manual)

Closed DV-73457 Rx Plant Exhaust Fan IB Out (Manual).

Closed DV-73458 Rx Plant Exhaust Fan 1C Out (Manual)

Closed 1

O FORM (0)372 22 3643

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