Text

Issue 58 to Abnormal Operating Procedure AOP-L, Loss of Instrument Air Header
	ML20091C414
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/02/1991
From:	Fuller C; PUBLIC SERVICE CO. OF COLORADO
To:	; NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
	AOP-L-I58, P-91247, NUDOCS 9108060279
	Download: ML20091C414 (14)
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Puldic Service Denver, Co 80201-OS40 16805 WCR 19 1/2, Platteville, Colorado 80651 August 2, 1991 Fort St. Vrain Unit No. 1 P-91247 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Stop P1-37 Washington, D.C.

20555 DOCKET NO: 50-267

SUBJECT:

ABNORMAL OPERATING PROCEDURE DISTRIBUTION Gentlemen:

We are transmitting herein the fo^ towing:

Issue SS of Abnormal Operating Procedure AOP-L Two copies of this procedure have also been transmitted to Region IV, Emergency Response Coordinator, in accordance with 10CFR50.54(q)

(Reference P-91249).

In accordance with 10CFR50.54(q), we have determined that the changes in this issue do not decrease the effectiveness of the Fort St. Vrain Emergency Plans and the plans, as. changed, continue to meet the intent of 10CFR50.47(b) and 10CFR50 Appendix E.

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P-91247 Page 2 August 2, 1991 If difficulties or questions arise in filing this procedure, please contact Mr. M. H. Holmes at (303) 480-6960.

Sincerely,

-k.kbt$c__

Charles H. Fuller Manager, Nuclear Production Fort St. Vrain Nuclear Generating Station CHF/bj Attachments cc:

J. B. Baird Senior Resident Inspector Fort St. Vrain Gordon Kirk Emergency Planning Specialist Fort St. Vrain

.e,

- Page 1 of 2 A Public FORT ST. VRAIN NUCLEAR GENERATING STATION 107 Service

rusuc sanvice comeAny or cotonApo 07/31/91 O

ABNORMAL OPERATING PROCEDURES ISSUE EFFECTIVE NO.

SUBJECT NUMBER

-0 ATE -

l AOP INTRO Abnormal Operating Procedures Introduction 56 02-13-91 l

i AOP-A Moisture In-Leakage 58 02-13-91 AOP-B Reactor Scram 58 02-13-91 i

EP B-2 DELETED 01-09-88 AOP-EP C Loop Shutdown 57-Last 03-28-90 AOP D-1 Single Circulator Trip 56 02-13-91 L

AOP-EP 0-2 Three Circulator Trips 54-Last 03-21-90 AOP-EP E Abnormal Reactor Power Change 56-Last 03-28-90 AOP-F Restoration of Essential Electric Power 1

11-05-90 A0P-EP F-1 Main Turbine Emergencies 58-Last 03-28-90 A0P-EP F-2 Low Condenser Vacuum Turbine Trip 55-Last 03-28-90 AOP-EP F-3 Loss of Outside Power and Turbine Trip 55-Last 03-28-90 AOP-EP F-4 Loss of Outside Power and Turbine Trip with Failure of One Diesel Generator Set to Start 55-Last 03-28-90 AOP-EP G Loss of Active Core Cooling 56-Last 03-28-90 A0P-H-1 Abnormal Radioactive liquid Waste From~ Plant 58 03-27-91 l-

-AOP-H-2 Abnormal Radioactive Gas Release From Plant 58 03-27-91 AOP-H-3 High Activity in the Plant 58 03-27-91 AOP-I Discussion of Fire-56 08-01-90 L

A0P-1-2 Chemical Spill Response 1_

01-16-91

- FORM (D)372 22 YA3 l

Page 2 of 2 O Public FORT ST. VRAIN NUCLEAR GENERATING STATION

$9fVlCO' PUBUC SERVICE COMPANY OF COLORADO 07/31/91 O

ABNORMAL OPERATING PROCEDURES ISSUE EFFECTIVE NO.

SUBJECT NUMBER

-DATE -

J DELETED 05-14-82 AOP-K-1 Environmental Disturbances - Earthquake 60 03-27-91 A0P-K-2 Environmental Disturbances - Tornado 57 04-10-91 l A0P-L Loss of an Instrument Air l

Header 58 07-31-91 AOP-EP M Loss of Hydraulic Power 56-Last 03-21-90 AOP-N Loss of an Instrument Bus 57 03-27-91 AOP-P Loss of a 0.C. Bus 58 03-27-91 A0P-EP Q Steam Leak or Inadvertent.

Lifting of Steam Relief Valve 57-Last 04-25-90 AOP-R Loss of Access to Control Room 55 03-20-91 AOP-EP S Loss of HVAC to 480 Volt Switchgear Room 54-Last 03-28-90 A0P-V Restoration of PCRV Integrity 1

11-05-90 l

EP CLASS Event and Emergency Classification Overview 8

03-29-91 FORM (01772 22 3843

AOP-L 1

Issue 58 r

Public FORT ST, VRAIN NUCLEAR GENERATING STATION Page 1 of 3 g;

) SOfVICO' PUBLIC SERVICE COMPANY OF COLORADO O

TITLE:

LOSSdFANINSTRUMENTAIRHEADER AUTHORIZED

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4 AOP-L Issese $6 Page 2 or 3 (4 )

405S OF AM I NS ila tiott N T AIR HEAD (R S YMf"l OM-AC T l O'l MA T R l x I

I I

SIMPIONS 1

1 I

I i

1.1 1

1.2 4

1.3 1

1.4 I

I I

inst. Air Presseere i

Inst. Air Header i

l ets t. Ai r fleede r i toss of both Instf 1

I ACllONS I

low 8

"A" Pressure low I

8* Pressure l ow I a i r headers i

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l-0650, 2-6 I

l-06 ( PI-82 32 )

I l-06 (PI-8?$8a) i l

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l 1

9 I

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OPE RA T OR ACIION3 I

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i ?.1 I

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I I Ierminate Defueling I

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i i Activities I

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bcv

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l-l l 1 ( n su r e! standby compressor i XX l

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i i sta rts and alegnment to 6

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I affected header i

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l l i 2.3 I

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i B 8_ 60 PSIG and decreasing,i i

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a i set the helium circulatur i i

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i I b ra ke a nd seats.

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1 Dispatch operators to i

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i i isolate, if p<>ssible i

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I I isolate portions ol' I

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i QPERAIOR ACilONS I

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8 l 8 Close V-8?6'y and V-8288tl i

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I to isolate Reactor I

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I Bui6 ding "A" header I

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I i 9 Close V-87$4 and V-82885 I

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I Ibsilding "H" beader I

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ADP-L lasue 36 i

Page 3 of 3 1

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LOSS OF AN INSTRUMENT AIR HEADER

}YMPIOM-ACTI01 MATRIX l

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SYMPIOMS I

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inst. Ai r Header I

inst. Ai r Header I Loss of both Inst, 8

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"B" Pressure 8.ow I ai r headers 1

8 I

l-06 BI, 2-6 4

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I l-06 (Fl-8254) 1 8

4 4

I I

I 4

8 8

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1 I

I 1 I Close V-8264 and V-82883 8

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i Bui lding "A" heade r i

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THE fOLLOWING ACil0NS ARI

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REQUIRED ONLY If COMIROL VIA IHE AfifCIED AIR HEADER ltAD BEEN tOSI I

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AOP APP L Issue 58 age 1 of 7 O Service

Public FORT ST, VRAIN NUCLEAR GENCRATING STATION PUBUC SERVICE COMPANY OF COLORADO INTRODUCTION 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 introduced into l

either system just ahead of the system air accumulator, ahead of the system air dryers, or downstream of the system air dryers in case i

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, 1-06H, 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, 1-06 PI-8212 1.3 Instrument Air Header "B" Pressure Low, 1-06 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 2.1 Terminate Defueling Activities Until instrument air headers are restored, terminate defueling activities and close all openings to PCRV.

FORM lol 372 22. y;43

, n,. - -

AOP APP L Issue 58 Page 2 of 7 A Public FORT ST. VRAIN NUCLEAR GENERATING STATION

%)7 Service

PUBLIC SERVICE COMPANY OF COLORADO 2.2 Ensu're standby compressor starts and alignment 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.

l l

2.3 IF 60 psig 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 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 operating media which will last for a limited period of time. The proper action, therefore, is to isolate the 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.

p) l 2.4 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.

CAUTION:

THE FOLLOWING STEPS ARE TO BE PERFORMED ONLY IF1 ATifIil4~DiffTRESSURE HAS BEEN LOST, AND ME LOOFISOLAT ED.

The remainder of this abnormal procedure assumes there has been a major breach in an air header line. As such the remaining steps deal with leak source identification and isolation.

1 2.5 Isolate portion of af fected header and determine if header pressure regained.

a)

Close V-8265 and V-82884 to isolate reactor building "A" header.

G FOAM (Di F2 22 3fM3

AOP APP L Issue 58 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 3 of 7 O SerVlCe*

4 PUBLIC SERVICE COMPANY OF COLORADO b)

Close 4-8254 and V-82885 to isolate reactor builoing "5' header, c)

C__ose V-8264 and V-82883 to isolate turbine iilding "A" header.

d)

Close V-8255 and V-82886 to isolate turbine Duilcing "B" neader.

l 2.6 If header pressure regained, leave cortion containing leak isolated.

Olosing air header isolation valves should be an effective means of locating the portion of the header containing the leak and also an effective means for isolation. There are local pressure gauges at each of the isolation valves.

Isolation of a portion of the header containing the leak will minimize subseouent operator actions required for control of the plant NOTE: THE FOLLOWING ACTIONS ARE REQUIRED ONLY IF CONTROL VIA THE AFFECTED AIR HEADER HAS BEEN LOST.

Thefollowingstepsofthisabnormal$rocedureare 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, j

2.7 In affected loop, shutdown auxiliaries, including bearing water pumos and isolate surge tank level valves.

Control of the loop has been lost with loss of the associated instrument air supply.

1 2.8 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 filling the liquid waste system.

l 2.9 Refer to Tables L.3 and L.4 for ef fect of loss of air and 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 FORM tD1372 22 3643

AOP APP L i

Issue 58 I

FORT ST. VRAIN NUCLEAR GENERATING STATION Page 4 of 7 0 Public Service *'

PUBLIC SERVICE COMPANY OF COLORADO l

O TABLE L.3

. LOSS OF AN INSTRUMENT AIR HEADER I EFFECT OF LOSS ON I ETTEIT OF LOSS ON l FUNCTION l

"A" INST. AIR l

"B" INST. AIR l

NOTES l

HEADER l

l.

I

_I_

NOTE: (FO) = Falls Open (FC) - Fails Closed Normal Bearing l LV-2135-1 (FO) l LV-2136.1 (F0) l Shut down bearing Water System l LV-2135-2 (FC) l LV-2136-2 (FC) l water pumps and lHas backup air for lHas backup air for lisolate level l1 hour and manual 11 hour1.273148e-4 days 0.00306 hours 1.818783e-5 weeks 4.1855e-6 months and manual l Control valves on Ishutoff valves.

Ishutoff valves.

110s5 of backup l

l l air supply.

l l

l l Recycle valve i Recycle valve l Produces helium l FV-21297 (FO) l FV-21298 (FO)

Icirculator trip l

l l(Loss of bearing l water due to l

1 O

l l

l simultaneous l

l l failure of backup l

l l bearing water 1

l Isupply.

I I

I l

1 I

Bearing Water l POV-21285-1 (FO) l POV-21286-1 (FO) l 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 jwater fires the 1 5 minutes.

l 5 minutes.

l accumulator.

I l

l Buffer Helium l HV-2366-1 (FO) l PDV-23111 (FC) l Supply l

l Has backup air forl l

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

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

1 I

l PDV-2367-1 (FC) l l

l Backup air l

l 1

I I

Low Pressure l Lose normal drain l Water drains to l

Separator Crainsl LV-21115 (FC) l turbine water l

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

l l

O FORM (D)772 22 3643

AOP APP L Issue 58 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 5 of 7 O Service

PUBLIC SERVICE COMPANY OF COLORADO TABLE L.3 LOSS OF AN INSTRUMENT AIR HEADER I EFFECT OF LOSS ON l EFFEU OF LOSS ON l j

FUNCTION l

"A" INST. AIR I

"B" INST. AIR l

NOTES d

l HEADER l

HEADER l

1 I

I NOTE: (FO) = Fails Open (FC) - Fails Closed Turbine Water l LV-21130 (FO) l LV-21114. (FO) l Drain Tank l Has backup air forl Turbine water re-I i 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and hand-l moval pumps cycle.l l Jack.

l LV-21130 operates l l

l normally (opens onl l

l high level).

l 1

l I

l l PV-21120 (FO) Has l l

l backup air for l

l l 1 hr and handjack.l l

1 l

Flash Tank Orain! LCV-3218 (FC)

I LCV-3217-2 (FC) l0n 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 l Becaut.e XEP-3217 l l drain path. On l loses supply air l Iloss of "A" header i LCV-3251-1 (FO) l lonly controlling I LCV-3251-2 (FO) l l valve is HV-3250.

I I

I 150 psig HOR 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 l HV-5211-1 ( FO) l PCV-5214-3 ( FO) l manual control if I HV-5211-2 (FO) l (Flow to Close) l aux boiler is on.

l l HV-5202-1 (FO) l Loss of "B" HDR l

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

l HV-5203-2 (FO)

Imanual control of l

l 15214 valve station.

l 9

FORM t01772 22 3643

i AOP APP L Issue 58 Public FORT ST. VRAIN NUCLEAR GENERATING STATION age 6 of 7 h UOlVlCO*

PUBLIC BERYlCE COMPANY OF COLORADO g)

/

TABLE L.4 VALVES BACKED UP WITH NITROGEN Valve Nunoer Function Failure Mode HV-2187-1 Circulator IA Bearing Service Isolation Open HV-2187-2 Circulator 1A Bearing Service Isolation Open HV-2187-3 Circulator IA 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 IA Bearing Service Isolation Open HV-2167-8 Bearing Water Accumulator Circulator 1A Open LV-21303 Circulator IA HP Separator DR (Manual)

Closed HV-2138-1 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 IC Bearing Service Isolation Open p

HV-2188-6 Circulator 1C Bearing Service 4 solation Open

(~)

HV-2188-7 Circulator IC Bearing Service Isolation Open HV-2188-8 Bearing Water Accumulator Circulator 1C Open LV-2130A Circulator IC HP Separator DR (Manual)

Closed HV-2iS9-1 Circulator IB Bearing Service Isolation Open HV-21s3 2 Circulator 1B Bearing Service Isolation Open HV-2189-3 Circulator 18 Bearing Service Isolation Open HV-2189-4 Circulator IB Bearing Service Isolation Open HV-2189-5 Circulator IB Bearing Service Isolation Open HV-2189-6 Circulator IB Bearing Service Isolation Open HV-2*lE9-7 Circulator IB Bearing Service Isolation Open M-2169-8 Bearing Water Accumulator Circulator IB Open HV-2190-1 Circulator ID Bearing Service Isolation Open HV-2190-2 Circulator 10 Bearing Service Isolation Open t

l Ht-2190-3 Circulator 10 Bearing Service Isolation Open HP2190-4 Circulator 10 Bearing Service Isolation Open HP2190-5 Circulator ID Bearing Service Isolation Open HV-2190-6 Circulator ID Bearing Service Isolation Open l

HV-2190-7 Circulator 10 Bearing Servico Isolation Open Bearing Water Accumulator Circulator 10 Open HV-2190-8 1

LV-2135-1 Makeup Bearing Water Surge Tank 1A Open LV-2135-2 Drain Bearing Water Surge Tank 1A Closed l

LV-2136-1 Makeup Bearing Water Surge Tank 1B Open I

LV-2126-2 Drain Bearing Water Surge Tank 1B Closed (o]

LV-21130 TWDT Drain to Reactor Building Sump Open l

l

,- m _

l

AOP APP L Issue 56 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 7 of 7 OSerVICO' PUBUC SERVICE COMPANY OF COLORADO TABLE L.4 VALVES BACKED Up WITH NITROGEN Valve Number Function Failure Mode POV-21285-1 Loop 1 Bearing Water Accumulator Open PDV-21285-2 Gas Pressurizer 1A Outlet Open PDV-21286-1 Loop 2 Bearing Water Accumulator Open PDV-21286-2 Gas Pressurizer 1B Outlet Open 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 HV-21415-2 Loop 1 Accumulator Purge Block Closed HV-21416-1 Loop 2 Accumulat:r Gas Pressure Closed HV-21416-2 Loop 2 Accumulator Purge Block Closed PV-21120 Turbine Water Drain Tank Vent Open LV-21130 Turbine Water Drain Tank Level Valve To Open Keyway PDV-2367-1 Buffer Makeup from Helium Storage Closed POV-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-733.56 Rx Plant Exhaust Fan IA Out (Manual)

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

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

Closed l

l

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FORM 10)372 22 3M3 f

l

-.

ML20091C414

Text

SUBJECT:

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