ML20237H257

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Rev 10 to Abnormal Operating Instruction AOI-13, Loss of Ercw
ML20237H257
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 04/23/1987
From: Jacqwan Walker, George Wilson
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20237H133 List: ... further results
References
AOI-13, NUDOCS 8708170120
Download: ML20237H257 (22)
v • d • e


Text

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TENNESSEE VALLEY AUTHDRITY 1 L. SEQUOYAH NUCLEAR PLANT ... )

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ABNORMAL OPERATING INSTRUCTION A01-13

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LOSS OF ESSENTIAL RAW COOLING. WATER Units 1 and 2 Revision 10 PREPARED BY: George Wilson . -

RESPONSIBLE SECTION: Operations REVISED BY: Gary L. Terpstra SUBMITTED BY: .h .i A v1 f- ~

p SupervisoF "

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PORC Review: lPR 231987 i ate APPROVED BY:

' ' Plant Manager ,

DATE APPROVED: TsiY3IS87 i

- Reason fo'r revision (include all Instruction Change Form Nos.):

Revised to reduce immediate operator actions; combine pump trip /

casing failure sections; delete loss of all ERCW pumps and operating requirements for various plant site conditions j sections; and add Appendix R valye information.

The last page of this instruction is Number: 20 u.

'-i 8708170120 B70811 PDR ADOCK 05000327 -

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. i SEQUOYAH NUCLEAR PLANT .]

PLANT INSTRUCTION REVISION LOG 1

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A8 NORMAL OPERATING INSTRUCTION ~ A0I-13 i REVISION Date Pages REASON FOR REVISION (INCLUDE COMMIT-LEVEL Approved Affected MENTS'AND ALL ICF FORM NUMBERS)

/

2 08/27/79 ~All 7-Added 18A

< 2,4,6-16, l 3 09/11/80 18 All 4 10/14/80 .

5 07/13/81 All 1, added 6 08/18/81 22,23 ,

7 02/16/82 23 F

8 03/30/83 18 '

Deleted 9 09/21/84 22,23 Revised to reduce i'mmediate operator actions; combine pump trip /

casing. failure sections; delete. loss of .

all ERCW pumps and operating re;; ire- I ments for various plant site conditions I

sections; and add Appendix R valve:

10 APR 2 31980' All information. 4 L .

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Page 1 Revision 10

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LOSS OF ESSENTIAL RAW COOLING HATER ' #

Page 1 of 1 I. PURPOSE The purpose of this instruction is to provide operator actions for the following events:

1. Section A: Running Pump Trip or Casing Failure
2. Section B: Supply Header Pipe Rupture -

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a) Part 1: In Yard Area b) Part 2: In Auxiliary Building c) Part 3: In ERCH Pumping Station ~

, 3. Section C: Discharge Header Pipe Rupture a) Part 1: In Yard Area I b) Part 2: In Auxiliary Building l

was.

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Page 2 Revision 10 SECTION A: RUNNING PUMP TRIP OR CASING FAILURE Page 1 of 2 I. SYMPTOMS A. Possible Alarms:

l 1. "ERCW SUPPLY HDR A LOW" (12,000 gpm dec), XA-55-27A, Windows 1 15 and/or 20. ,

2. "ERCW SUPPLY HOR B LOW" (12,000 gpm dec), XA-55-27A, Windows 22 and/or 27.

- 3. "ERCH HDR A PRESSURE LOW" (50 psig dec), XA-55-27A, Windows 16 and/or 28.

4. "ERCH HDR 8 PRESSURE LOW" (50 psig' dec), XA-55-27A, Windows 23 and/or 35.
5. "ERCH PUMP K (J, L, M, N, P, Q, R) DISCH PRESS LOW",

XA-55-27A, Windows 24, 17, 4, 31, 25, 32, 11, 18

6. " MOTOR TRIPOUT" XA-55-278-A, Window 32
7. " MOTOR OVERLOAD" XA-55-278-A, Window 25 B. Possible Indications l 1. PI-67-493A (488A) ERCH header A(B) showing low pressure
2. Disagreement light on relative to tripped pump
3. PI-67-437A (433A, 445A, 441A, 461A, 465A, 453A, 457A) on pump K-A (J-A, M-8, L-B, Q-A, R-A, N-B, P-B) tripped showing low pressure.
4. FI-67-61 or FI-67-62 showing low flow on header A or header B II. AUTOMATIC ACTIONS None 0158B/wjs .

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- Revision 10 a

SECTION A: RUNNING PUMP TRIP OR CASING FAILURE Page 2 of 2 i

III. IMMEDIATE OPERATOR ACTION A. StartredundantERCHpuNp.

IV. SUBSEQUENT OPERATOR ACTION A. Ensure header pressures and flows return to' normal. t B. Ensure pump; loading is normal (amperesLat normal expected valve).

C. Determine cause of pump trip and have corrective maintenance performed.

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  • D. Ensure that the remaining OPERABLE pumps are aligned for automatic loading on emergency power.

E. Refer to TS 3.7.4.1. Implement REP per IP-1 (Engineered Safety features) as required. ,

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.. Revision'10

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SECTION B: . SUPPLY HEADER PIPE RUPTURE PART 1: "IN YARD AREA" Page 1 of 4

'I. SYMPTOMS ,

A. Probable Alarms

h. 1. "ERCH SUPPLY HDR A(B) LOW" (12,000 gpm dec.), XA-55-27A, ,

Windows 15, 20, 22, 27. -

- 2. "ERCH HDR A(B) PRESSURE LOW" (50 psig dec.), XA-55-27A, Windows 16, 28, 23,-35.

3. "ERCW HDR 1A-A (18-8, 2A-A, 28-B) STR DIFF PRESS HI" (25 psid  ;

inc.), XA-55-27A, Windows 2, 9, 14., 21. ,

8. Probaule Indications q

l' . PI-67-493A (488A) ERCH header A(B) showing low pressure

2. PI-67-437A (433A, 445A, 441A, 461A, 465A, 453A, 457A) on pump .

K-A (J-A, M-8, L-8, Q-A, R-A, N-8, P-B) supplying ruptured  !

header showing low pressure  !

3. FI-67-61(62) showing low flow on header A(B) that is ruptured.
4. Visual observation of washed-out area around break (may be j

, only symptom of a small break).

II. AUTOMATIC ACTIONS None III. IMMEDIATE OPERATOR ACTION A. Dispatch personnel to determine break location.

IV. SUBSEQUENT OPERATOR ACTION A. Start spare pumps as needed to maintain header pressure B. Begin reducing non-essential loads.

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PART 1: "IN YARD AREA" Page 2 of 4 9

IV. SUBSEQUENT OPERATOR ACTION -(continued)

NOTE: It will be necessary to energize ACBs to Appendix P valves NOTE: This procedure isolates normal ERCW supply to diesels lA-A and 2A-A. If in modes 5 or 6, then lockout these diesels. If'in modes 1, 2, 3, or 4; then station an operator to open the alternate ERCH supplies if the diesels start. The alternate supplies are:

1-FCV-67-68 (IA-A diesel), and 2-FCV-67-68 (2A-A diesel)

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C. For lA supply header:

1. Open 1-FCV-67-147, Sup Hdr lA to Hdr 2B (Rx MOV Bd 1A2-A)
2. Ensure 2-FCV-67-147 OPEN, Sup Hdr 2B to Hdr lA (Rx MOV Bd 2B2-B)
3. Close 1-FCV-67-81, Aux Bldg Hdr lA Isol (Rx MOV Bd 1A2-A)
4. Ensure 1-FCV-67-492 CLOSED, Hdr. lA Sup. Isolation before strainer l

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Page 6

_. Revision 10 SECTION B: ' SUPPLY HEADER PIPE RUPTURE

'PART 1: "IN YARD AREA" Page 3 of 4 ,

h IV.' LSUBSEQUENT OPERATOR ACTION s(continued)'

NOTE: It will be necessary to energize ACBs to Appendix R, valves

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' NOTE: This procedure isolates normal ERCH supply to diesels.18-B.and 2B-B. If in modes 5 or 6, then lockout these. diesels. If.in

-(" modes 1,'2, 3, or 4, then station an operator to open the j alternate ERCH supplies if the diesels start. The alternate supplies are: 1-FCV-67-65 (lB-B diesel), and 2-FCV-67-65 (28-8 1 y diesel). -

~D. For 18 supply header: .

'1. Ensure 1-FCV-67-223 OPEN, Sup Hdr 18 to Hdr 2A (Rx MOV Bd 1A2-A)-

- 2. Ensure 2-FCV-67-223.0 PEN, Sup Hdr 2A to H'ir 1B (Rx MOV Bd 2A2-A)

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3.'Open 1-FCV-67-424, Sup Hdr 1B to CCS Hx A (Rx MOV Bd 1A2-A)

4. Close 1-FCV-67-82, Aux Bldg Hdr 1B Isol (Rx MOV Bd 182-B)  ;
5. Close.1-FCV-67-489, Hdr 1B Sup Isolation before strainer NOTE: It will be necessary to energize ACBs to Appendix R valves.

E. For 2A supply header:

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1. Ensure 1-FCV-67-223 OPEN, Sup Hdr IB to Hdr 2A (Rx MOV Bd 1A2-A)
2. Ensure 2-FCV-67-223 OPEN, Sup Hdr 2A to Hdr IB (Rx MOV Bd 2A2-A) j

.- 3. Open 1-FCV-67-424, Sup Hdr 18 to CCS Hx A (Rx MOV Bd 1A2-A)

4. Close 2-FCV-67-81, Aux Bldg Hdr 2A Isol (Rx MOV Bd 2A2-A) ,
5. Close 2-FCV-67-492, Hdr 2A Sup Isolation before strainer j 01588/wjs s.

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  • SECTION B: . SUPPLY HEADER PIPE RUPTURE PART 1: "IN YARD AREA"

' l '- Page 4 of 4 IV. -SUBSEQUENT OPERATOR ACTION g(continued)

NOTE: It will be necessary to energize ACBs to Appendix R valves.

F. For 28 supply header: ,

1. Open 1-FCV-67-147, Sup Hdr 1A to Hdr 2B (Rx MOV Bd 1A2-A)
2. Ensure 2-FCV-67-147 OPEN, Sup Hdr 28 to Hdr 1A (Rx MOV Bd 2B2-8)
3. Close 2-FCV-67-82, Aux Bldg Hdr 2B Isol (Rx MOV Bd 2B2-B) 1 1-. .

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4. Close 2-FCV-67-489, Hdr 2B Sup Isolation before strainer u NOTE: It may be necessary to reduce:ERCH loads due to loss of ERCW header.

G. Ensure header pressures and flows return to normal.

H. Ensure pump loading is normal (amperes at normal expected valve).

I. Refer to Technical Specification 3.7.4.1. Implement REP per IP l (Engineered Safety Features) as required.

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Page 8 Revision 10

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SECTION B: SUPPLY HEADER PIPE RUPTURE PART 2: "IN AUX BLDG" Page 1 of 3

1. SYMPTOMS -

, A. Probable Alarms f

1. "ERCH HDR A(B) PRESSURE LOW" (50 psig dec.), XA-55-27A, .

Windows 15, 20, 22, 27.

2. "El'CW HDR 1 A-A (18-B, 2A-A, 28-B) STR DIFF PRESS HI" (25 psid inc.), XA-55-27A, Windows 2, 9, 14, 21.
3. "TURB, AUX OR REAC BLDG FLOODED", 1-XA-55-158 Window 24.

B. Probable Indications

1. PI-67-493A (488A) ERCH header A(B) showing low pressure.
2. PI-67-437A (433A, 445A, 441A, 461A, 465A, 453A, 457A) on pump K-A (J-A, M-8, L-8, Q-A, R-A, N-8, P-B) supplying ruptured header showing low pressure.
3. 1-FI-67-61(62) showing high on header 1A(IB) or 2-FI-67-61(62) on header 2A(28).
4. Visual observation of break (may be only symptom of a small break).

II. AUTOMATIC ACTIONS None

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Page 9 Revision 10 _

1 SECTION B: SUPPLY HEADER PIPE RUPTURE

[~. PART 2: "IN AUX BLDG"=

l Page 2 of 3

' III. .IMMEDIATE OPERATOR' ACTION .s.

A. Dispatch personnel to determine break location.

I V .~ SUBSEQUENT OPERATOR ACTION NOTE: It will be necessary to energize ACBs to Appendix R valves A. For.1A supply header:

1. Refer to loss of equipment list A01-138.2-1, prior to l- isolating. ,
2. Close'l-FCV-67-81 (Rx MOV Bd 1A2-A).

L 3. Ensure 1-FCV-67-147 CLOSED (Rx MOV Bd 1A2-A).

i NOTE: It will be necessary to energize ACBs to Appendix R valves B. For 18 supply header up to 1-FCV-67-424:

1.- Refer to loss of equipment list A01-138.2-2, prior to isolating.

2. Close 1-FCV-67-82 (Rx MOV Bd 1B2-B).

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r 3. Ensure 1-FCV-67-424 CLOSED (Rx MOV Bd 1A2-A).

NOTE: It will be necessary to energize ACBs to Appendix R valves C. For 1B supply header between 1-FCV-67-424 and 1-FCV-67-223:

1. CCS heat exchanger A will be lost which will effect multiple systems.
2. Ensure 1-FCV-67-424 CLOSED (Rx MOV Bd 1A2-A).
3. Close 1-FCV-67-223 (Rx MOV Bd 1A2-A).

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Page'10 Revision 10

-SECTION B: SUPPLY HEADER PIPE RUPTURE

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PART 2: "IN AUX BLDG" Page 3 of 3' IV. SUBSEQUENT OPERATOR ACTION ,,(continued)

, NOTE: It will be necessary to energize ACBs to Appendix R valves D. For 2A supply header: ~

,1. Refer to loss of equipment list AOI-13B.2-3, prior to ~

l isolating.

2. Close 2-FCV-67-81 (Rx HOV Bd 2A2-A).
3. Close 2-FCV-67-223 (Rx MOV Bd 2,A2-A).

.4. .Open.1-FCV-67-424 (Rx MOV Bd 1A2-A).

E. For:28 supply header:

1., Refer to~ loss of equipment list AOI-13B.2-4, prior to

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isolating.

L, J 2. Close 2-FCV-67-82 (Rx H0V Bd 2B2-B).

3. Close 2-FCV-67-147 (Rx MOV Bd 2B2-B).

1 j 4. Open 1-FCV-67-147 (Rx H0V Bd 1A2-A).

F. Implement REP per IP-1 (Engineered Safety Features) as required.

G. Determine cause of line failure through corrective maintenance performed.

H. Possible unit shutdown due to loss of cooling to reactor coolant-  !

pump motor coolers and/or loss of coolant to containment rod drive vent coolers, depending on ambient temperature in containment.

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I. In the event of a change in the rated thermal power level-exceeding 15% in one hour, notify the chem lab to initiate the conditional portions of SI-407.2, and SI-415 due to the thermal power change.

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.. j LOSS OF EQUIPMENT LIST A01-138.2-1 (HEADER 1A) i f 1.

Turbine-driven auxiliary feedwater pump 1 A-S"'

2. -Lower containment vent coolprs 1A and IC'**
3. Instrument room water cooler 1A'**
4. Upper containment vent coolers 1A and 1C
5. Containment spray heat' exchanger 1A
6. Emergency makeup'to CCS surge tank A")

i 7.* Soace and room cooling equipment 1A and station-service air l' f. compressor (supply available from 18).. ,

K 8. ERCW supply to motor-driven auxiliar l return header A is out of service."y feedwater

' pump 1A only if ERCW 9.. Shutdown board room air-conditioning water chiller A")

10. Control rod drive vent coolers 1A and IC")
11. Reactor coolant pump motor coolers 1 and 3"'

12.- Back'up' to header 2B"'

13.* Aux. control air compressor A"'

14. - Electric board room A/C condenser A")
15. Main control room A/C condenser A")

16.* Centrifugal charging pump oil cooler 1A"'

17.* Safety injection pump oil cooler 1 A")

  • NOTE: Damage is imminent unless equipment is stopped.

" ) NOTE : Redundant counterpart must be operating to prevent equipment damage.

" 'NOT E : ERCW not normally required.

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Page 12

. Revision 10 LOSS OF-EQUIPMENT LIST AOI-138.2-2 (HEADER 18) 1

1. Turbine-driven auxiliary feedwater pump 1 A-S")
2. Lower containment vent cooless 18 and 1D

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3. . Instrument room water cooler IB
4. Upper containment vent coolers 18 and ID(*' ,
5. Containment spray heat exchanger 1B'*'
6. Emergency makeup to CCS surge tanh A'*)
7. ERCW supply to motor-driven auxiliary feedwater pump 1B, only if ERCH

- l- return header B is out of service. ,

-( 8.* Space and room cooling equipment IB and station-service air il compressor (supply available from 1A).

9. Control-rod drive vent coolers 18 and 1D"'

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10.. Reactor coolant pump motor coolers 2 and 4'*)

11. Backup to header 2A") -
12. Electric board room A/C cosidenser B"'
13. Main control room A/C condenser B"'

14.* Centrifugal charging pump oil cooler IB(

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  • Safety injection pump oil cooler IB(')
  • NOTE: Damage is imminent unless equipment is stopped.

" ' NOTE : Redundant counterpart must be operating to prevent equipment damage.

" ) NOTE : Multiple systems are affected if lost.

" 'NOT E : ERCH not normally required.

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Page 13

. .. Revision 10 LOSS OF EQUIPMENT LIST A01-138.2-3 (HEADER 2A) r r/

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1. ' Turbine-driven auxiliary feedwater pump 2A-S
2. Lower containment vent coolers 2A and 2C'*)'

, 3. Instrument room cooler 2A'*)

4. Upper containment vent coolers 2A and 2C'** ,
5. Containment spray heat exchanger 2A")
6. Emergency system to CCS surge: tank B
7. ~ Space and room cooling e'quipment 2A'*)

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8. ERCH supply to motor-driven auxiliary feedwater pump 2A, only if ERCH

. return header A is out of service.'"

9. CCS heat exchanger A' & B"'
10. Backup to header 1B")
11. Control rod drive bent coolers 2A and 2C'*)
12. Reactor' coolant pump motor coolers 1 and 3")

13.* Centrifugal charging pump oil cooler 2A

14.* Safety injection pump oil cooler 2A

  • NOTE: Damage is imminent unless equipment is stopped.

'*) NOTE: Redundant counterpart must be operating to prevent equipment damage.

" 'NOT E: Multiple systems are affected if lost.

") NOTE: ERCH not normally required.

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Page-14 Revision 10 .

LOSS OF EQUIPMENT LIST A0I-138.2-4 (HEADER 28)

1. Turbine-driven auxiliary feedwater pump 2A-S(*)

2 .' Lower containment vent cooleys 28 and 2D (*)

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3. Upper containment vent coolers 28 and 2Dcr>
4. Containment spray heat exchanger 2B(*) -

l l. 5. CCS surge tank B emergency supply (

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6. Space and room cooling equipment 2B(*)
7. ERCW supply to motor-driven auxiliary feedwater pump 28 only if ERCH Lf. .

return header 8 out of service.(*) .

'F 8. Shutdown board room air-conditioning water chiller B(*'  ;

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9. CCS heat exchanger C") s

-1 10. Backup to header 1A(*) g

11. Control rod drive vent coolors 28 and 2D")

I 12. Reactor coolant pump motor coolers 2 and 4

13.* Centrifugal charging pump oil cooler 28")

14.* Safety injection pump ob cooler 2B")

15.*' Aux. control air ccsmprdsor B(

16. Instrument room wate'r cooler 2B(*)

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  • NOTE: Damage is imminen't ur,less equipment is stopped.

_(*) NOTE: Redundant counterpart must be operating to prevent equipment damage. 3 4

"' NOTE: Multiple systems are affected if lost.

(*' NOTE:

ERCW not normally\ required, s 0158B/wjs s -

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. Revision 10-SECTION B: SUPPLY HEADER PIPE RUPTURE PART 3: "IN ERCH PUMPING STATION" Page 1 of 3 I. SYMPTOMS s A. Probable Alarms

. 1. "ERCH HDR A(B) PRESS LOW" (50 psig dec.), XA-55-27A, Windows 16, 28, 23, 35. -

2. "ERCH SUPPLY HDR A(B) LOW" (12,000 gpm dec.), XA-55-27A, Windows 15, 20, 22, 27.

3 .' "ERCW PUMP K (3, M, L, Q, R, N, P) DISCH PRESS LOH" (65 psig h dec.), XA-55-27A, Windows 24, 17, 4, 31, 25, 32, 11, 18. - *

4. ERCH DECK SUMP LEVEL HI", XA-55-158, Window 3.
5. MECH EQUIP SUMP ERCH PMP STAT LVL HI, XA-55-15A, Window 13.

B. Probable Indications

1. PI-67-493A'(488A) ERCH header A(B) showing low pressure.
2. PI-67-437A (433A, 445A, 441 A, 461 A, 465A, 453A, 457A) on purap

'K-A (J-A, M-8, C-B, Q-A, R-A, N-8, P-B) supplying ruptured header showing low pressure.

3. 1-FI-67-61(62) showing low flow on header 1.A(18) and on 2-FI-61(62) for header 2A(28).

II. AUTOMATIC ACTION None I*

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Page 16 Revision 10 SECTION B: SUPPLY HEADER PIPE RUPTURE PART 3: "IN ERCH PUMPING STATION" f Page 2 of 3 III. IMMEDIATE OPERATOR ACTION l A. Dispatch personnel to determine break location.

IV. SUBCEQUENT OPERATOR ACTION 1 CAUTION: Follow this instruction only if rupture is on main header between pumps and first isolation valve upstream of strainers.

A. Begin reducing non-essential loads , .

NOTE: It will be necessary to energize ACBs to Appendix R valves.

B. IF supply header "A" is ruptured, THEN:

l. Trip and ?ockout pumps K-A, 0-A, R-A, and Q-A.
2. Close 1-FCV-67-492 and 2-FCV-67-492.
3. Open 1-FCV-67-147 (Rx MOV Bd 1A2-A) and 1-FCV-67-424 (Rx MOV Bd E

1A2-A).

4. Ensure 1-FCV-67-223 (Rx MOV Bd 1 A2-A) and 2-FCV-67-223 (Rx MOV Bd 2A2-A) and 2-FCV-67-147 (Rx HOV Bd 282-B) - OPEN
5. Run pumps M-B, L-B, P-B and N-B 0158b/wjs

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Page 17 Revision 10

- .SECTION B: SUPPLY HEADER PIPE RUPTURE

[ PART 3: "IN ERCW PUMPING STATION" Page 3 of 3

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.C. ,I_F supply header "B" is , ruptured, THEN*

1. Trip and lockout pumps M-B, L-B, P-8, and N-B'
2. Close 1-FCV-67-489 and 2-FCV-67-489
3. Open 1-FCV-67-147 (Rx MOV Bd 1A2-A) and 1-FCV-67-424 (Rx MOV' Bd 1A2-A)
4. Ensure 1-FCV-67-223 (Rx MOV Bd 1A2-A) and 2-FCV-67-223 (Rx MOV Bd'lA2-A) and 2-FCV-67-147 (Rx MOV Bd 2H2-B) - OPEN
f. .
5. Run pumps K-A, Q-A, J-A, and R-A

- 0. Ensure inservice header pressures return to normal.

l E. Ensure pump ~1oading on inservice header is normal.

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l l F. Have pipe rupture repaired.

i-P. Implement _ REP per IP-1 (Engineered Safety Features) and TS 3.7.4.1 as required.

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Page 18 jJ Revision 10 SECTION C: DISCHARGE HEADER PIPE RUPTURE

.f._ PART 1: "IN YARD AREA"'

l7 Page 1 of 1 f _I. SYMPTOMS s

.A. Probable' Indications

1. Bad wash in yard area near leak ,

.II. AUTOMATIC ACTION None

'I- III. IMMEDIATE OPERATOR ACTION

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.A.. Dispatch personnel to determine brdak location IV. SUBSE0UENT OPERATOR ACTION A. Because of loss of A or B train on both units, plant loading and condition will be used to decide steps to take to initiate maintenance.

B. Implement REP per IP-1 (Engineered Safety Features) and refer to TS 3.7.4.1 as required.

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Page 19 Revision 10

.s SECTION C: DISCHARGE HEADER PIPE RUPTURE PART 2: "IN AUX BLDG" f:- Page 1 of 2 I. SYMPTOMS ,

A. Probable Alarms

1. "TURB, AUX OR REAC BLDG FLOODED", 1-XA-55-158, Hindow 24 ,

II. AUTOMATIC ACTION None

' III. IMMEDIATE OPERATOR ACTION

~

'A. Dispatch personnel to determine break location IV. SUBSEQUENT OPERATOR ACTION NOTE: It will be necessary to energize ACDs to Appendix R valves A. Isolate affected train by closing 1-FCV-67-81 (Rx MOV Bd 1A2-A) and 2-FCV-67-81 (Rx MOV Bd 2A2-A) for A header or 1-FCV-67-82 (Rx MOV Bd IB2-B),and 2-FCV-67-82 (Rx M0V.Bd 282-B) for B header.

B. Ensure FCV-67-151 (Rx MOV Bd 1A2-A) closed and close 2-FCV-67-146

! for A header ruptured. Close FCV-67-152 and 1-FCV-67-146 for B

( header ruptured.

C. After determining which headar is ruptured and isolated, refer to

" Loss of Equipment List" AOI-138.2-1 for header IA

~

AOI-138.2-2 for header 1B A01-138.2-3 for header 2A A01-138.2-4 for header 28.

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SQN AOI-13 '

Page 20 Revision 10 SECTION C: DISCHARGE HEADER PIPE RUPTURE F PART 2: "IN AUX BLOG" l Page 2 of 2 D. Have repairs initiated ,immediately.

f E. In the event of a change in the rated thermal power level

[ exceeding 157. in one hour, notify the chem lab to initiate the I conditional portions of SI-407.2 and SI-415 due to the thermal*

power change.

F. Refer to TS 3.7.4.1 and implement REP per IP-1 (Engineered Safety Features) as required.

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