ML20235X055

Rev 0 to Sys Operating Instruction SOI-74.2, Removal of RHR for Repair of 2-FCV-74-2

ML20235X055
Person / Time
Site:	Sequoyah
Issue date:	10/10/1987
From:	Jacqwan Walker TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20235X032	List: ML20235X029 ML20235X055 ML20235X065
References
SOI-74.2, TAC-R00233, TAC-R233, NUDOCS 8710190185
Download: ML20235X055 (20)

Text

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TENNESSEE VALLEY AUTHORITY -l~7 ~ ~ ~ . ,

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SEQUOYAH NUCLEAR PLANT bS.

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S0l: CA~EGORY SYSTEM OPERATING' INSTRUCTION .

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S01-74.2 REMOVAL OF RHR'FOR REPAIR OF 2-FCV-74-2' Revision 0 I

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PREPARED BY: Sylvester/Terpstra {

1 RESPONSIBLE SECTION: Op'erations REVISED BY': 6.- Te,p sdv a -

. SUBMITTED BY: . kd ponsible Section Supervisor {

PORC REVIEW DATE: 70 l(0 [ O APPROVED BY: 8 Plant Mfnsger ' f DATE APPROVED: 10l(0 / 87 Reason for revision (include all Instruction Change form Nos.):

1 This -is a 'new procedure / instruction for removino RHR system from service for  !

repair of RHR isolation valve 2-FCV-74-2.

The last page of this instruction is number: '16 8710190185 871012 PDR ADOCK 05000327 P ppg

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, SEQUOYAH NUCLEAR PLANT PLANT INSTRUCTION REVISION LOG SYSTEM OPERATING INSTRUCTION SOI-74.2 REVISION Date Pages REASON FOR REVISION (INCLUDE COMMITMENTS

_ LEVEL Approved Affected AND ALL ICF FORM NUMBERS)

This is a new procedure / instruction for removing RHR systems from service for repair 0 All of RHR isolation valve 2-FCV-74-2.

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.TO: Controlled Manual Holder FROM: Document Control / Records Management, SQN i DATE:

SUBJECT:

. TRANSMITTAL OF.SEQUOYAH INSTRUCTIONS i

a Please sign below and' return to acknowledge-receipt of the following material and affirm that'it has been placed in the appropriate manuals, your 1 table of contents has been updated, and the superseded instruction removed- )

.and discarded. Return this transmittal to Document. Control within 10 days. 1 SOI-74.2 l I

REMOVAL OF RHR FOR REPAIR OF 2-FCV-74-2 SOI-928.3 3 l

Remove and destroy Insert Page Date Revision Page Date Revision i

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Return to: Document Control / Records Hanagement,.SQN

- Signature /Date' 0683C/cwm

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SQN SOI-74.2 Page 1 Revision 0 Section A en Page 1 of 9 oui I fj ,

I. PURPOSE C/CEGORY A,7 To provide license requirements, conditions for operation, precautions- 2 and instructions for removing RHR system from service for repair of RHR isolation valve 2-FCV-74-2.

II. LICENSE REQUIREMENTS T.S. 3.4.1.4 III. CONDITIONS FOR OPERATION-i A. _ PZR level 1: 20%. '

B.

P2R PORVs available for service with'their block valves OPEN.

C.

I Steam bubble maintained in PZR.

D. PRT level 6 30%.

E.

One CCP in service and capable of being aligned to take suction from the RWST.

1 F. All letdown orifices opened. )

1 G. I Seal water to reactor coolant pumps maintained.

H.

Letdown and Excess Letdown inservice per 50I-62.1 with I component cooling water. {'

I._ Both trains of MDAFWPs aligned and maintained available.  !

J.  ;

All 4 SGs filled and maintained > 25% narrow range level indication with SG blowdown available.

K. RCS pressure at ~ 225 psi.

, L.

At least 2 CRDM coolers in service and'missle shields installed.

M. All 4 RCS loop filled and vented.

N.

RCDT available for service.

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• SON S0I-74.2 Page 2 I Revision 0 i

Section A j Page 2 of 9 '

// ff i III. ' CONDITIONS FOR OPERATION (continued) 0.

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Cold Overpressure Protection System (COPS) available.

l P. All Pzr safety valves operable. l l

1 Q. Reactor trip breakers open and placed under administrative.

control. 1 l

R. S/Gs under N, cover pressure.

S. Liquid waste system capable of handling 50 gpm flow feed &

bleed method to Rx Bldg sump.

-T. Temporary cover plate for 2-FCV-74-2 available.

U.

Establish communications between CR and work area.

(Work site phone no. )

V. Establish RCS temperature between 100*F and 110*F.

W. Remove power and tag electrically 2-FCV-74-2. This is to allow Electrical Maintenance to disconnect leads to valve.

X. RHST contains level to maintain TS requirements for mode 5 and fill RHR suction piping.

Y. Cntmt equipment hatch installed per mode 6.

Z. RHST and RCS boron concentration 2 2000 ppm.

IV. PRECAUTIONS A. Maintain RCS pressure B 200 psi and 5 275 psi.

B. RCS Temp. must be maintained < 200*F.

C. Observe all applicable radiation protection instructions.

D. Maintain PRZ level 2 20% and < 80%.

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301-74.2 Page 3-Revision O'  !

1 Section A- E I

Page 3 ofl9 S01 l yA77 INSTRUCTIONS CATEGORY A. Approval from Plant Manager to perform this instruction.

B. Have AUO verify the following valves closed.74-504 68-539 74-549 68-528 74-552

'l C.

Request Mechanical Maintenance to perform the following work. <

l)' Remove cap and. Install a "Y" on drain valve 74-552. Route l a clear tygon hose from one side secured at same elevation  ;

as FCV-74-2. Route a hose to drain from the other side.

See Figure 1 of this instruction. Tygon hose will be used to monitor draining of suction piping. {

2) m e bl.ind flange and install hose on 74-504 and route

3) Remove blind flanges and install hoses to valves68-539 and 68-528. These hoses should be. routed to drain.

D.

Initiate Data Sheet 1 of this package to log RCS Temp, and PRZ level every 15 minutes while RHR is out of service.

E. Initiate SI-127.

F.

Initiate SI-214 " Uncontrolled Boron Dilution" to place the dilution paths under administrative control.

G.

Coordinate with all sections involved and verify.all sections are ready to perform this instruction.

Mechanical Maintenance Operations Quality Control Electrical Maintenance DNE OES Metallurgical Eng.

RAD CON Mechanical Test CAUTION: Time.is a crucial factor in the performance of SMI-2-74-1.

Each as step should be performed as accurately and expeditiously possible.

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SQH i SOI-74.2 Page.4 5 Revision 0 Section A i Page 4 of 9 S 01 f

V, INSTRUCTIONS (continued)

H.

CATEG0ay . ,,A 1 Permission obtained from Unit 2 SRO to remove the _RHR System "

l from service to perform SMI-2-74-1.

1 I. i Remove Both Trains of RHR from service in accordance with S01-74.1  !'

i CAUTION: Do NOT allow RCS temperature to decrease below 100*F.

J.

Try to maintain RCS temperature < 150*F by adjusting letdown / excess letdown flow and CCS to their heat exchangers.

K.

Adjust charging / seal injection to maintain pzr level between 20% and 50%.

L.

i Tag the RHR System in accordance with AI-3. Attachment 1 contains a recommended clearance. Manually position 2-FCV-74-2 to mid-position.

M.

l Verify closed 74-520, RHR pmp 2A-A discharge valve.

N.

Verify closed 74-521, RHR pmp 28-B discharge valve.  !

i NOTE:

If at any time it is deemed necessary to return RHR to service, the SRO can inform maintenance to install plate or valve and return RHR to service per SOI-74.2C.

O.

After RHR piping is drained, SRO should determine if the following conditions are met:

1) Leakage rate acceptable 2)

Time frame after securing RHR < 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

3) Heat-up rate < 3*F an hour 4)

Problems do not exist that would prevent the return of RHR to service within estimated time frame (24 hrs.).

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If all conditions are met, notify Mechanical Maintenance to continue with Section 6.0 of SMI-2-74-1. (If conditions are not met NA this step.)

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If all conditions are not met go to SOI-74.2B reestablish RHR cooling.

(NA this step if- all conditions are met.)

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t SQN S01-74.2 Page 5 Revision 0 .

Section A Page 5 of 9 '

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V. INSTRUCTIONS (continued)

C.EG0m' ,,A 77 R. Continue monitoring RCS parameters per Data Sheet !. -

S. Continue to monitor maintenance work activity.

T. If RCS Temp. exceeds 150*F, place SG blowdown in service to Turbine Bdg. sump per SOI-41.B. Refill-SG with AFW, (NA this step if RCS Temp remains < 150*F.)

NOTE: The limit of draining.only 1 SG at a time will not apply in this procedure.

U. If RCS Temp. exceeds 160*F, initiate a feed & bleed process by l- performing the following steps. (NA this step if RCS Temp.

l remains less than 160*F.).

NOTE: Establish - 50 gpm feed and bleed process.

NOTE: Monitor Rx Bldg sump and pump down as necessary per S01-77.lA3. 3 CAUTION: Montior VCT level. Swap CCP suction to RHST if VCT level < 77..

Bleed path from Loop 4 HL to sump.

1. Verify blind flange removed and hose installed on i

68-539 (Drain on loop 4 RTD manifold )

2. Close 68-541.

3. Verify open 68-537.

l 4. Verify open 68-538.

NOTE: Adjust charging as necessary to maintain PZR level.

5. Throttle open 68-539 to obtain - 50 gpm.

If 50 gpm cannot be established through loop 4 continue with the following steps.

Bleed path from loop 3 HL to sump

6. Verify blind flange removed and hose installed on 68-528 (Drain on loop 3 RTD manifold) 0306U/cwm

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• SQN SOI-74.2 l Page 6  !

Revision 0 Section A Page 6 of 9 S0,- 1 V. INSTRUCTIONS (continued) // A //

T. (continued) - CA.MGORY A

7. Close 68-530.

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8. Verify open 68-526.

l 9. Verl_fy open 68-527.

NOTE: Adjust charging to maintain PZR level.

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10. Throttle open 68-528.

• V. If RCS Temp. exceeds 170*F perform'the following steps. (NA l this step if RCS Temp. remains < 170*F.)

1. Have Mechanical Maintenance install cover plate on  !

RHR piping at FCV-74-2 OR install valve bonnet.

NOTE: Hose should remain installed on 2-74-504.  ;

2. When cover plate or bonnet is installed, have ASE release Hold Order per AI-3, however leave the following valves isolated. These will be returned normal per this procedure. Other valves on clearance should be returned to normal alignment.

2-FCV-74-1 2-74-520 2-FCV-74-3 2-74-521 2-FCV-74-21 2-FCV-63-1

3. Perform 501-74.2C to fill and vent RHR suction piping and pumps.

j 4. Place RHR system in service per 501-74.1

5. Consult with Plant Management for evaluation and instructions.

1 H. If RCS Temp. exceeds 190*F, perform S0I-74.20. (NA this step if RCS Temp. remains < 190*F.)

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• SQN i SOI-74.2. I Page.7-Revision 0 Section A en.

Page;7 of 9 QU. // ff V. INSTRUCTIONS (continued) CA...:GORY l NOTE: Hose should remain installed on 2-74-504.

X. After Mechanical Maintenance completes maintenance on l

FCV-74-2, have ASE Release the Hold Order on RHR System per 1 AI-3, however leave the following valves isolated. These will be returned normal per this procedure. Other valves on-  ;

clearance should be returned to normal alignment. )

2-FCV-74-1 2-74-520 2-FCV-74-3 2-74-521

! 2-FCV-74-21 '

2-FCV-63-1 Y. Fill and Vent RHR system in accordance with SOI-74.2C.

NOTE:

SRO will determine if post-maintenance test will be completed on FCV-74-2 before placing RHR system in service.  !

Z. Place RHR System in service in accordance with SOI-74.1.

AA.

Isolate the Loop 3 & 4 HL bleed path if feed and bleed of RCS l

Loops were established by performing the following steps. N/A if not established. I l

1. / _ Close 68-539 ,

2. -/ Open 68-541 i l 3. / Close 68-528 1

4. / Open 68-530 ,

5. Request Mechanical Maintenance support to have hoses removed and blind flanges installed on 68-528 and 68-539.

BB.

Remove SG blowdown from service per 50I-41 if placed in service at 150*F.

CC. / Verify hoses removed and blind flanges installed on valves68-528 and 68-539.

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.S01-74.2 Page 8,

' Revision 0 Section A Page-8 of 9 FIGURE 1-f ,

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2-FCV-74-2 '

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14, 3 ,

TYGDN TUBING 3

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2-VLV-74-552 ,y, CONNECTDR j TD DRAIN q . -

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l SQN S0I-74.2 Page 9 Revision 0 '

Section A Page 9 of 9 1 1

DATA LOG SHEET 1 Time RCS Temp <2> Pzr level RCS heatup rate oT/A time (*F/hr)) l l

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Record data every 15 mins.

'2' use Incore T/Cs reading from TSC computer, or P250 or M18.

Use hot calibrated instrument.

Calculate heating rate every hour.

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.S01-74.2 i Page.10 .

1 Revision 0 l Section B f Page 1 of.1 R I. PURPOSE CA~~ EGO RY To provide instructions for p' "ing RHR System back in service if repair. ,

. work cannot continue on FCV-74-2. .l i

II. INSTRUCTIONS 1 A. Notify sections listed in step D of S01-74.2A that work cannot continue on FCV-74-2.

NOTE: Hose should remain installed on 2-74-504.

B. Have hold order released in accordance with.AI-3, however leave the following valves isolated as applicable. These will be returned normal per this procedure. Other valves on clearance should be return to normal' alignment.

2-FCV-74-1 2-74-520 2-FCV-74-3 2-74-521 1 2-FCV-74-21 l 2-FCV-63-1 i C. Fill and Vent the RHR system in accordance with SOI-74.2C I Section IV, steps A-Z and then return to this instruction. "

D. Place RHR in service in accordance with 501-74.1.

NOTE: Plant management will evaluate plant conditions and provide guidance.

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0, SQN S01-74.2 Page 11 Revision 0-Section C Page 1 of 3 Filling and Venting the RHR Suction Piping I. PURPOSE The purpose of this instruction is to provide precautions, conditions for operation, and instructions to fill and vent the RHR suction piping via FCV-63-1.

, II. PRECAUTIONS l

A. Monitor pressurizer level while performing this instruction.

B. Monitor RHST level while performing this instruction.

III. CONDITIONS FOR OPERATION A. Observe the applicable radiation protection instructions when venting.

B. RHST contains level to fill RHR suction piping hoJ xi-t:" TC requirement for Mode 5.

Q g y l IV. INSTRUCTIONS A.

[]

Verify FCV-74-2 bonnet or cover plate installed.

B. Verify maintenance left FCV-74-2 in mid position per SMI-74-1  ;

or cover plate installed. '

C. Verify HS-74-10A for RHR pump A-A in PULL-TO-LOCK position.

D. Verify HS-74-20 for RHR pump B-B in PULL-TO-LOCK position.

E. Verify FCV-74-1 closed.  !

F. Verify FCV-74-3 closed.

a G. Verify 74-521 clos'ed.

H. _ Verify FCV-74-21 closed.

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4 SQN-S0I-74.~2 Page 12  ;

Revision 0" l .

Section C i Page 2 of 3 '

IV.

So- u .?% n INSTRUCTIONS (continued) p 3-- D AD\/ I

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3. Verify'74-520' closed.

K. Verify FCV--63-1 closed. 1 L. / Verify 74-549 & 74-552 closed.

M . ,, Verify blind flange removed and hose installed on 74-504.

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N. Verify 74-504blosed. '

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Establish communications between c6ntrol room and AUO ,

! stationed at.FCV-63-1. 1 P. Establish communications between control room and AUD '

1 stationed at vent valve 74-504. ,

i Q. Have AVO manually crack open FCV-63-1 until flow is l established.

1 R. When flow stops, have AU0' slowly open,, vent valve 74-504. l j S. / When a solid stre'am of water flows from vent valve, close 74-504.

T. ____, Request Hechanical Maintenance to install cap on 74-552 and 3 blind flange:on 74-504. ji U.  ; Close FCV-63 l. i j 3-V. <

',, Open FCV-74-1.

L WJ Je cover plate do FCV-74-2 NOT installed, THEN'open 'FCV-74-2.

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-IV. INSTRUCTIONS (continued)- b()l // -

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X. Vent RHR pump 2A-A by the following: CA"~GO RY-

1. 0 pen FCV-74-3. j

2. Unlock and open 74-516.

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3. / After one minute, closes.74-516. ,

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4. / Lock 74-516.

5. / Open 74-520, RHR pump 2A-A discharge valve. '

i Y. Vent RHR pump 28-B by the following:

1. Open FCV-74-21.

2. Unlock and open 74-517.

3. / After one minute, close 74-517.

4. / Lock 74-517.

5. / _

Open 74-521, RHR pump 2B-B discharge valve.  !

Z. / Verify cap installed on 74-552 and-blind flange on 74-504.

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SQN i 501-74.2 Page 14 .;

Revision 0  ;

Section D en i Page l'of 2 OU //'g/

Alternate Heat Sink by Sweeping RCS and Using Steam Generator CK G0RY ho J I. PURPOSE The purpose of this section of the 50I.is to establish alternate heat sink using steam generator. .The.first method is to sweep the RCS by running a RCP for a short period of~ time. . This will circulate & mix the RCS. The second method will use.the S/G PORVs. This method will be '

implemented if for some reason the repair work can not.be completed or the plate installed. This method will require RCS temperature > 212*F before it can become effective.

II. SYMPTOMS

1. RCS temperature > 190*F during performance of repair work on ,

2-FCV-74.2. I k

III. INSTRUCTIONS i

1. Establish conditions for running a RCP per SOI-68.2 (Loop 2 perferred).

2. Start a RCP per 501-68.2.(Loop 2 perferred) to sweep RCS.

3. Stop RCP per S01-68.2 after S minutes.

4. Continue to start RCP at time intervals as determined by SRO to sweep RCS if the following conditions are met:

a. Sweeping RCS provides effective Heat Removal Method

b. Conditions for running RCPs per SOI-68.2 continue-to be met

c. Motor start limitations are met

1) Only one RCP will be started at any one time.

2) Two successive starts are permitted providing the motor is allowed to coast to a stop between starts. A third start may be made when the winding and the rotor core have cooled by running for a period of 20 minutes after the second start or by standing idle for a period of 45 minutes. Starts should not average more than six per day throughout the life of the motor.

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Section D. {

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.5. E RCS temperature > 200*F THEN perform tht following: I

.a. Initiate the REP. j

b. IF conditions allow THEN, start a RCP' per .50I-68.2 (Loop 2 perferred).

1 NOTE: Natural circulation can not be established / verified I until RCS temperature B 212*F. .E natural circulation NOT verified, THEN increase dumping steam.

c. E conditions do NOT allow running a RCP THEN monitor natural circulation.

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1) RCS subcooling

2) S/G press stable or decreasing

3) T-hot stable or decreasing  ;

4) Core exit T/C stable or decreasing

5) T-cold at saturation temp for S/G press

d. Establish notor-driven AFW.

1) Start both motor-driven AFW pumps.

2) Control S/G level between 25% and 50%.

e. Open S/G PORVs.

6. If secondary heat sink unavailable (S/G Narrow b nge Level t

< 25% M D total available AFH flow < 440 gpm) THEN. implement FR-H.1, Response to Loss Of Secondary Heat Sink.

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SQN L i i, LSOI-74.2 3 Page.16 '

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-\'l ATTACHMENT l-

-l Page 1 of 1 i Recommended Clearance For Maint Work on 2-FCV-74-2

1. RHR pump 2A-A ACB' 6.9kV.SD BD'2A-A-BBCS .2-HS-74-10A' 2'. RHR pump 2B-B ACB. 6.9kV SD BD 2B-8.

BBCS 2-HS-74-20A

3. 2-74-501 Tagged open

4. 2-FCV-74-1 ACB Rx Mov BD 2Al-A

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HW BBCS 2-HS-74-1A

5. 2-FCV-74-2 Place viv in mid position ACB RX Mov BD 2B1-B .)!

BBCS 2-HS-74-2A

6. 2-FCV-63-1 ACB Rx Mov BD 2Al-A HW BBCS 2-HS-63-1A 1 1

7. 2-FCV-74-3 ACB Rx Mov BD 2Al-A HW BBCS 2-HS-74-3A i

8. 2-74-506 Closed

9. 2-FCV-74-21 .ACB Rx Mov BD 281-B HW BBCS 2-HS-74-21A

10. 2-74-507 Closed

11. 2-74-549 & 552 Tagged open drain's

12. 2-74-504 Tagged open vent i

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.e ENCLOSURE 3 SMI-2-74-1 REPAIR OF 2-FCV-74 l I

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