ML20237H196

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Rev 13 to Abnormal Operating Instruction AOI-10, Loss of Control Air
ML20237H196
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 05/19/1987
From: Terpstra G, Jacqwan Walker
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20237H133 List: ... further results
References
AOI-10, NUDOCS 8708170101
Download: ML20237H196 (15)
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TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT. .

ABNORMAL OPERATING INSTRUCTION

AOI-10 LOSS OF CONTROL AIR Unit 1 and 2 _

Revision 13, PREPARED BY: Gary L. Terpstra RESPONSIBLE SECTION: Operations REVISED BY: Gary L. Terpstra

[~ SUBMITTED BY:. .h. 't pRgonsibleSectionSupervisor PORC REVIEW DATE: MAY 191987 .

APPROVED BY:

Plant Manager DATE APPROVED: MAY l 91987 -

Reason for revision (include all Instru'ction Change Form Nos.):

Revised to WP 11715/ECN L6311 (S/G PORV # 1/4 reach rods),

delete duplication of other instructions, reduced immediate

._. operator actions, part B - delete actions of throttling 74-530/531 since FCV-62-83 fails closed and general format revision. This revision constitutes a biennial review.

The last page of this instruction is number: 13 he.D 8708170101 870011 PDR ADOCK 0 % y7 ,

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SEQUOYAH NUCLEAR PLANT l

PLANT INSTRUCTION REVISION LOG ABNORAML OPERATING INSTRUCTION AOI-10 Date Pages REASON FOR REVISION (INCLUDE COMMIT-

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REVISION LEVEL Approved Affected MENTS AND ALL ICF FORM NUMBERS)

, 3 10/12/79 All 2,5,7,11 4 06/16/80 12,14 -

3,6,8,12, 16,17,18 I 5 09/12/80 Add: 3A 6 03/30/83 3A,8 _____

7 03/19/84 All 8 10/04/84 2 ~

1,7,11, Revised to correct auxillary air com-9 11/12/85 12,14 pressor switch setpoints per WP-11523.

Revised to include additional informa-tion concerning LCV position on loss of air and air accumulator capacity 10 01/29/86 12 included to satisfy CATS #35395 .

Revised to add "B" train vacuum relief valves to Table 1. Also, deleted state-ment concerning reactor cavity ventila-tion support cooling which is not

- 11 06/26/86 12,17,18 required by AOI-10.

Revised statement referencing contain-air temperature limits to agree with

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12 09/29/86 9 Technical Specification.

Revised to HP 11715/ECN L6311 (S/G PORV

  1. 1/4 reach rods), delete duplication of other instructions, reduced immediate operator actions, part B -

delete actions of throttling 74-530/531 since FCV-62-83 falls closed and general

- f rmat revisi n. This revision 13 FAAY 1 9 1987 All constitutes a biennial review.

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Revision'13 1.0 PURPOSE This' instruction provides operator actions for the following events.

1. Section A: Loss of Nonessential Atr in Modes 1, 2, or 3
2. Section B: Loss of Nonessential-Air with RHR In Service
3. Section C: . Loss of Auxiliary Air Train A or B If a reactor trip does occur during'use of this. instruction, then use E-0, " Reactor Trip or Safety Injection" prior to using this instruction. If a loss of air was due to loss of offsite power then go to A01-35, " Loss of Offsite Power".

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SON AOI-10 i Page 2 -

Revision 13 Section A  !

Unit I and 2 I Page 1 of 5 I i

LOSS OF NONESSENTIAL AIR IN MODES 1. 2. OR 3 1 I. ' SYMPTOMS A. Possible Alarms i

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1. TRAIN A (B) AUX CONTROL AIR PRESS LOW l
2. SERVICE AIR ISOLATION CLOSED l B. Indications -
1. Air-operated valves begin to go to their fail-safe position II. AUTOMATIC ACTIONS A. Air compressors start / load on decreasing header pressure.

B. Aux Air Compressors start @ 5 80 psig on Aux air receivers.

'C. Control air isolates from Service Air @ 5 80 psig (PCV-33-4).

D. Aux Air isolated from Control air @ 5 75 psig (FCV-32-82 & 85).

E. Reactor Trip due to MFH Pumps tripping from loss of injection

. water, MFN. reg valves failing closed, or heater drains failing closed.

F. Loss of condenser vacuum may cause turbine-reactor trip.

G. MSIVs may fall close isolating steam to turbine.

-- III. IMMEDIATE OPERATOR ACTION A. Dispatch personnel-to check Air Compressors.

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IV. SUBSEQUENT OPERATOR ACTION A. Maintain unit in HOT STANDBY. WHEN air is restored, go to RECOVERY (section V).

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~ Section A i Unit 1 and 2 {

Page 2 of 5

.g- LOSS OF NONESSENTIAL AIR IN MODES 1. 2. OR 3 IV. SUBSEQUENT OPERATOR ACTION (continued)

8. Locally determine the cause of the low pressure.

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1. Manually start any compressor that failed to start.

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2. Attempt to load any compressor that failed to load by }

isolating air to unloading' solenoid and loosen fitting to 'l relieve pressure to unloader. ' )

I- 3. Verify station air supply valve PCV-33-4 is closed to station J

1 service air if. control air pressure is < 80 psig.

4. Verify air dryers operating properly, (blow down valve not stuck open. etc.) If necessary, transfer to the spare j dryer. FI-32-3 and FI-32-4 can be used to determine if the '

problem is upstream or downstream of the flow indicators. -

C. IF MSIV close due to loss of air, THEN place HS in CLOSE position to prevent opening.

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NOTE: ERCH TCVs will fall open. CNTMT pressure should remain within acceptable limits.

D. Check CNTMT pressure and temperature within TS limits. Maintait CNTMT temperature within limits by starting and stopping '

L upper / lower compartment cooling fans.

E, Start EGTS per S0I-65.1 and initiate Auxillary Building Isolation  !

~ per SOI-30.5E.

F. The following RCS and CVCS valves will fail as shown.

1. PRT cannot be vented, drained, or cooled - Valves Fall Closed
2. Aux spray - Falls Closed.
3. Normal letdown valves - Fails Closed
4. Excess letdown valves - Falls Closed

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SQN AOI-10 Page 4 Revision 13 Section A Unit 1 and 2 Page 3 of 5 LOSS OF NONESSENTIAL AIR IN MODES 1. 2. OR 3 IV. SUBSE0UjNTOPERATORACTION(continued)

5. RCP seal return - Falls Closed
6. Charging flow control (FCV-62-93) - Falls Open G. IF PD pump running, THEN start a CCP AND stop PD pump..

H. Close.FCV-62-90 or 91 since letdown is lost.

I. Maintain RCP seal injection less than 8 gpm per pump by throttling RCP seal injection needle valves.

NOTE: Making up to RCS without letdown will cause increasing pzr '

level. Adequate pzr capacity is available to allow time (> l 2 hrs) for restoring control air.

.J. Supplying RCP seal water from VCT will result' in decreasing VCT level and increasing pzr level.

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1. IF VCT level 5 7%, THEN verify CCP suction from RHST.
a. FCV-62-132 and 133 - Closed

, b. FCV-62-135 and 136 - Open

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2. WHEN VCT level B High Alarm (93%), THEN return CCP suction to VCT.

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a. Open FCV-62-132 and 133
b. Close FCV-62-135 and 136 K. 1[ pzr level > 70%, THEN begin a controlled RCS cooldown per G0I-3 to shrink RCS.

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L. IF pzr level > 92%, THEN ensure CCS flow through RCP thermal barriers AND stop CCPs.

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-AOI-10 i Page 5 -1 Revision 13 l Section A Unit 1 and 2 Page 4 of 5 LOSS OF NONESSENTIAL AIR IN MODES 1. 2. OR 3 IV. SUBSEQUENT OPERATOR ACTION (continued)

M. Manually throttle the following Hx's to limit cooling water flow through the Hx. .

1. Main turbine oil tank Hx TCV
2. Air and Ha side seal oil Hx's TCV's
3. Feedwater pump lube oil Hx TCV's
4. Gen He coolers TCV l 5. Gen stator cooling Hx TCV
6. Exciter cooling Hx TCV l

N. Stop the following equipment

1. Injection water pumps
2. Containment instrument room cooler circulation pump and fan l V. RECOVERY Depending upon the cause of the loss of control air, it may be possible to restore portions of the control air system immediately after a loss, i.e... isolating a header or line break. As the air pressure is restored to normal some of the air operated equipment will

, automatically align for power operation and some must be aligned by operator action. This recovery section calls attention to some of the ~

systems and equipmen'c requiring operator action to return to ncrmal.

These actions necessary for recovery will depend upon the conditions at the time of the loss and what portions of the system that were lost and the actions taken during the loss.

A. As soon as air is restored to the sampling system, verify RCS boron concentration and run a shutdown margin. (SI-38)

B. Restore upper and lower containment coolers to normal operation.

C. Verify proper operation of the auxiliary building ventilation system and shutdown the auxiliary building gas treatment system.

D. Verify proper operation of the containment annulus fans and shutdown the emergency gas treatment system.

E. Start the containment instrument room chilled water pump and fan. .

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Section A Unit I and 2 Page 5 of 5 i

LOSS OF NONESSENTIAL AIR IN MODES 1. 2. OR 3 V. RECOVERY (continued)

F. Check containment pressure to be within range of -0.1 psig to

+ 0.3 psig.

NOTE: If nonessential air isolated to reactor building, dispatch operator to AB el 714 to reopen isolation valve. Unit 1 (FCV-32-110), Unit 2 (FCV-32-Ill).

CAUTION: Charging line isolation' valves FCV-62-90 and 62-91 must be opened.

CAUTION: Charging line isolation valves FCV-62-90 and 62-91 must be opened.

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G. Establish normal letdown and charging per SOI-62.1. -RCP seal-

- injection needle valve will need to be repositioned per SI-137.3. i H. Establish normal cooling of the various t ondary systems whose Hx

' bypass were opened.

I. Start the injection water pumps.

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J. Steam generator blowdown valves failed closed on loss of air. ,

They must be re-opened.

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K. Verify BIT to boric acid tank recirculation flow and BIT temperature and concentration.

L. Drain and cool the pzr relief tank to normal temperature and pressure.

M. Place the makeup water treatment system in service or verify proper operation.

N. After control air has been restored, refer to 00I-2/3 for restart or for maintaining standby condition.

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-- Revision 13

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Section B Page 1 of 3 LOSS OF NONESSENTIAL AIR WITH RHR IN SERVICE I. SYMPTOMS

. A. Possible Alarms

1. TRAIN A (B) AUX CONTROL AIR PRESS LOW ,
2. SERVICE AIR ISOLATION CLOSED B. Indications  ;

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1. Air-operated valves begin to go to their fail-safe position  !

II. AUTOMATIC ACTIONS A. Air compressors start / load on decreasing header pressure.

B. Aux Air Compressors start 0 5 80 psig on Aux air receivers.

.C. CM trol Air isolates from Service Air @ 5 80 psig (PCV-33-4).

D. Aux Air isolated from Control air @ 5 75 psig (FCV-32-82 & 85). .

III. IMMEDIATE OPERATOR ACTION A. Dispatch personnel to check Air Compressors.

IV. SUBSEQUENT OPERATOR ACTION

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A. Maintain unit in HOT SHUTDOWN. WHEN air is restored, go to l RECOVERY (section V).

B. IF RCS is solid, THEN stop all RCPs and charging pumps.

C. Locally determine the cause of the low pressure:

l. Manually start any compressor that failed to start.
2. Attempt to load any compressor that failed to load by isolating air to unloading solenoid and loosen fitting to relieve pressure to unloader.

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, Section B Page 2 of 3 LOSS OF NONESSENTIAL AIR WITH RHR IN SERVICE IV. SUBSEQUENT OPERATOR ACTION (continued)

3. -Verify station air supply valve PCV-33-4 is closed to station service air if control air pressure is < 80 psig.
4. Verify air dryers operating properly, (blow down valve is not stuck open, etc.) If necessary, transfer to the spare dryer.

FI-32-3 and FI-32-4 can be used to determine if the problem is upstream or downstream of the flow indicators.

D. LF a pzr bubble exists, THEN:

1. Use pzr heaters to maintain pressure and temperature at values at time of air loss (or maintain pzr bubble).
2. Isolate charging by closing FCV-62-90 er 91.
3. Maintain RCP seal injection less than 8 gpm per pump by

. throttling RCP seal injection needle values.

NOTE: There is capacity in the pzr (for RCP seal flow) to allow time (> 2 hrs) for restoring air). Pzr level increases due to no letdown.

- 4. Check RCS cooldown rate. (RHR HX outlet & bypass FCVs fall open.) Establish a "zero" RCS cooldown rate with the AFW .

System and the S/G PORVs. The RHR system can also be used

' by locally throttling the CCS flow through the HXs and local

. adjustment of HX bypass isolation valves (74-36 and 37).

5. LF pzr level reaches 92%, THEN ensure CCS flow to thermal barriers AND stop all charging pumps. Allow pzr level to decrease by 20-25% then restart a charging pump.

_ E. LF,RCS is solid, THEN:

1. Ensure CCS flow to RCPs thermal barriers
2. IF RCS < 150 psig, THEN close RCP seal return FCV-62-61 or 63.

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Section B Page 3 of 3 f_.

LOSS OF NONESSENTIAL AIR WITH RHR IN SERVICE IV. SUBSEQUENT OPERATOR ACTION (continued)

3. Isolate charging by closing FCV-62-90 or 91.

I- 4. Check RCS cooldown rate. (RHR HX outlet and bypass FCVs fail open.) Establish a zero RCS cooldown rate by locally throttidng the RHR HX bypass isolation valves (74-36 and 37)

I or by locally throttling the CCS water from the RHR HXs.

NOTE: ERCH TCVs will fail.open. CNTMT pressure should remain within acceptable limits.

F. Check CNTMT pressure and temperature within TS limits. Maintain CNTMT temperature within limits by starting and stopping I upper / lower compartment cooling fans.

G. Start EGTS per S0I-65.1 and initiate Auxiliary Building Isolation I. per SOI-30.5E.

H. Stop the incore instrument room coolers circ pumps and fans.

Stop CNTMT purge supply and exhaust fans.

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J. Determine the cause of the failure and initiate corrective

.{ maintenance. WHEN corrective action taken, THEN:

1. Establish normal letdewn and charging per 501-62.1B and SOI-74.1.
2. Go to GOI-3B and re-establish normal RHR heat removal operation.

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Se'ction C Page'l of 3 LOSS OF AUXILIARY AIR TRAIN A OR 8 I. SYMPTOMS A. ALARMS

1. TRAIN-A (or R) AUX CONTROL AIR PRESS LOW ,
2. AUX AIR COMPR A (B) LOW OIL LVL HI AIR TEMP I I '. AUTOMATIC ACTIONS A. Aux Air Compressors start 0 5 80 psig on Aux Air Receivers.

B. Aux Air isolates from Control Air 0 5 75 psig (FCV-32-82 & 85).

C. Each Aux air supply to CNTMT-closes at 5 50 psig III. IMMEDIATE OPERATOR ~ ACTION

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A. Dispatch personnel to check Aux Air Compressors.

IV. SUBSE0 VENT OPERATOR ACTIONS .

NOTE: Each Aux air supply to CNTMT isolates at 5 50 psig to prevent pressurizing CNTMT in case of air line break inside. Reset switches for these valves are located '

AB el 714. .

A. Check CNTMT pressure between -0.1 to +0.3 psig.

B. Ensure Aux Air Compressors running and loaded.

L C. E air pressure < 75 psig, THEN verify Aux Air isolated from Control Air (FCV-32-85 and 82).

_- NOTE: Control air pressure should return to normal after the Aux Air System isolates.

D. Determine the cause of the loss and correct. E there is a line rupture, isolate that section and restore as much of the system as possible.

E. With normal air pressure restored, open FCV-32-82 and 85 one at a time, to help identify train in which air loss is occurring.

Leave the failed train isolated from the rest of the system.

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_ Section.C Page 2 of 3 LOSS OF AUXILIARY AIR TRAIN A OR B IV. SUBSEQUENT OPERATOR ACTIONS (continued)

F. IF Nonessential Air isolates to CNTMT, THEN open'l-FCV-32-110 or

'l- E FCV-32-lll (AB el 714)

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G. Air valves fail in the following manner (refer to TABLE 1 for detailed list)

1. AFW LCVs to S/Gs
a. Motor driven AFW LCV, fail open and bypass LCVs fall close
b. Turbine-driven AFW LCVs fail close

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2. One pzr spray valve will be inoperable. Ensure appropriate RCP is running for pzr pressure control I' a. E Train A air lost THEN PCV-68-3400 (Loop 1) falls closed-
b. E Train 8 air lost THEN PCV-68-3400 (Loop 2) falls closed

. NOTE: S/G RORVs 1 & 4 can be operated manually using reach rods in 480-V SD Bd Rm

3. Two S/G PORVs will be inoperable
a. IF Train A air lost THEN PCV-1-5 (S/G 1) and PCV-1-23 (S/G

, 3) fall close

b. E Train B air lost THEN PCV-1-12 (S/G 2) and PCV-1-30 (S/G 4) fail close s

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Section C Page 3 of 3 LOSS OF AUXILIARY AIR TRAIN A OR B IV. SUBSEQUENT OPERATOR ACTIONS (continued)

. H. E in mode 3, 4, or 5 THEN maintain S/G pressure and level control in following manner NOTE: S/G PORVs 1 & 4 can be operated manually using reach rods in 480V SO Bd Rm.

a. E loss occurs prior to RHR operation, THEN continue RCS cooldown via steam dumps and/or the 2 operable S/G PORVs.
b. AFW can be supplied to all S/Gs on loss of either train of Aux Air:

(1) Loss of train A air: Use AFW Pump.B-B to supply S/Gs 3 & 4. Stop AFW Pump A-A. Use AFW Pump A-S to supply S/Gs 1 &'2.

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(2) Loss of train B air: Use AFW Pump A-A to supply S/Gs 1 & 2. Stop AFW Pump B-B. Use AFW Pump A-S to supply S/Gs 3 & 4.

c. IF loss occurs after RHR cooldown, then loss of either train i of Aux Air will not affect RCS heat removal.

{ I. ABGTS damper fali closed on the affected train. (Refer to TS 3.7.8.)

J. EGTS dampers fail closed on the affected train. This system is

, not normally in service (Refer to TS 3.6.1.8).

l. K. Control Bldg HVAC dampers supplied from affected train fail closed, except inlet dampers to the MCR air handling units which i fall open. (Refer to TS 3.7.7)

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1. Both pressurizing fans' common supply to MCR AHUs dampers will close, and no longer supply the MCR. 1

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2. One of two emergency pressurizing fans is lost.
3. One of two emergency air cleanup fans is lot.
4. Emergency supply to shutdown board room 1B or 2A is lost. i

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.- TABLE 1 SYSTEM TRAIN "A" FAILS TRAIN "B" FAILS Main Steam-S/G PCV-1-5 (S/G 1) X ~PCV-1-30 (S/G 4) X PORVs PCV-1-23 (S/G 3) X PCV-1-12 (S/G 2) X' AFH - Motor LCV-3-156A X LCV-3-148A. X Driven LCV-3-156 (S/G 2) 0- LCV-3-148 (S/G 3) 0 Pumps LCV-3-164A X LCV-3-171A X LCV-3-164 (S/G 1) 0 LCV-3-171 (S/G 4) 0 Turbine LCV-3-172 (S/G 3) X LCV-3-173 (S/G 2) X Pump LCV-3-175 (S/G 4) X LCV-3-174 (S/G 1) ,X A8GT System- 1-FCO-30-146A X 2 FCO-30-157A X l-FCO-30-146B X 2-FCO-30-157B X EGTS- l-FCO-65-26 X l-FCO-65-27 X 2-FCO-65-46 X 2-FCO-65-45 X 0-FCV-65-24 X 0-FCV-65-43 X

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0-FCV-65-47A X 0-FCV-65-28A X 0-FCV-65-478 X 0-FCV-65-28B X 1-FCV-65-51 X 2-FCV-65-29 X 2-FCV-65-50 X l-FCV-65-30 X l-FCV-65-10 X l-FCV-65-8 X 2-FCV-65-9 X 2-FCV-65-7 X l-FCV-65-52 X 1-FCV-65-53 X L PCO-65-80 0 PCO-65-82 0 PCV-65-81 X PCV-65-83 X .

PCO-65-88 X PCO-65-89 X

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PCV-65-86 X PCV-65-87 X j 2-FCV-65-5 X 2-FCV-65-4 X PCS - PZR Spray - PCV-68-340D(Loop 1) X PCV-68-340B(Loop 2) X j CNTMT Vac Relief FCV-30-46 0 FCV-30-46 0 FCV-30-47 0 FCV-30-47 0

_ FCV-30-48 0 FCV-30-48 0 I Control Bldg FCO-31A-14 X FCO-31A-15 X AC & Vent FCO-31A-106A X FCO-31A-105A X FCO-31A-105B X FC0 31A-106B X FCO-31A-20 0 FCO-31A-23 0 FC0-31A-108 X FCO-31A-109 X

- FC0-31A-9 X FCO-31A-ll X

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