ML20206A354

Rev 6 to Instrument Maint Instruction IMI-118, Filling of Sealed Instrument Sys Backfilling,Venting &/Or Flushing of Instrument Sensing Lines

ML20206A354
Person / Time
Site:	05000000, Sequoyah
Issue date:	07/14/1986
From:	Lafevere C, Mccuistion M, Schnur R TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML082410757	List: ML20206A322 ML20206A354
References
IMI-118, NUDOCS 8704070496
Download: ML20206A354 (33)

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TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT INSTRUMENT MAINTENANCE INSTRUCTION IMI-118 FILLING OF SEALED INSTRUMENT SYSTEMS BACKFILLING, VEf[ TING,

AND/OR FLUSHING OF INSTRUMENT SENSING LINES Units 1 and 2 Revision 6

PREPARED BY:

M.

G.

McCuistion RESPONSIBLE SECTION:

Instrument Maintenance REVISED BY:

Roskell Schnur SUBMITTED BY:

p sponsible Section Supervisor PORC REVIEW DATE:

JUL 141986 APPROVED BY:

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Plant Manager DATE APPROVED:

JUL 141986 Reason for revision (include all Instruction Change Form Nos.):

Revised to correct various errors in Appendix E.

The last page of this instruction is number:

26 8704070496 870402 PDR ADOCK 05000327 p

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SEQUOYAH NUCLEAR PLANT DISTRIBUTION OF PLANT INSTRUCTIONS 7

INSTRUCTION CONTROLLED UNCONTROLLED i

NUP9ER OISTRIBUTIO*I OISTRfDUTION IMI-118 IM PRODUCTION PLANNER PLANT MANAGER. WBNP INSTRUNENT SHOP INSTR ENGINEER (IM)

NSRS. E3A12 C-K NEB. W10C174C-K ONP 00C CTRL. ;P 4S 1600-C PLANT MASTER FILE a

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SEQUOYAH NUCLEAR PLANT PLANT INSTRUCTION REVISION LOG INSTRUMENT MAINTENANCE INSTRUCTION IMI-ll8 REVISION Date Pages REASON FOR REVISION (INCLUDE COMMIT-LEVEL Approved Affected MENTS AND ALL ICF FORM NUMBERS) 0 10/16/79 ALL 1,Added 1

04/28/80 8-17 Title Chg 1, Added 2

01/05/83 18-25 3

10/03/83 20,21 Added 21A,B,C, 22,23,26-4 11/07/83 28 5

12/31/84 ALL Revised to correct various errors in 6

JUL 1419f34-26 Appendix E.

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i SQNP IMI-118 Page 1 of 7 Rev. 5

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FILLING OF SEALED INSTRUMENT SYSTEMS,

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BACKFILLING, VENTING, FLUSHING, AND/0R DRAINING OF INSTRUMENT SENSING LINES AND INSTRUMENTS 1.0 SCOPE j

1.1 This IMI is written as a supplement to other related IMIt, sis -

a' or it may be used with an MR.

1.2 The purpose of this IMI-118 is to provide instructions, prerequisites, -

e precautions, and limitations for backfilling and flushing instrument sensing lines which may or may not be contaminated.

7 1.3 Backfilling, venting, flushing, and draining instrument sensing lines may be ne'cessary to: remove an. obstruction;. purge'c6ntamin fluid back toward the source or. into a drain system leading away ated from'-

the instrument; perform maintenance on the lines or instruments; re-establish a condensate leg; and/oraremove entrapped air. -

1.4 This procedure is necessary for proper' operation and accuracy '6f' -

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instrumentation such as transmitters'and gauges, but safety is a l

prime consideration.

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1.5 Appendix A has been deleted.

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' Appendix B and C outline a procedure to fill B'arton sealed liquid.

1.6

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level systems; i.e., containment sump and pressurizer.,

1.7 Appendix D contains the equipment and materials list.

1.8 Appendix E contains a list of instruments which share a common sensing line with protection grade instruments.

i 2.0 PREREQUISITES

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2.1 Determine the need to backfill, vent, flush, or drain and how to.

accomplish.

2.2 In order to avoid safety hazards in a C-zone, plan for zero or j

minimum personnel exposure. Do not take unnecessary ' risks.

2.3 Identify other affected instruments or loops by reviewing applicable instrumentation drawings and Appendix E of this instruction. A number of instruments can be connected to a common sensing line, or instrument output could be connected to another loop or system.

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l 2.4 Determine the backfill equipment needed relative to the required volume, pressure, and location to be used. Equipment could be; a

' ~ imple plastic water bottle, a handpump, or a powered pump system.

s Gather the applicable fittings and equips'nt.

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2.5 Determine the nearest and best source of de-ionized or demineralize'd, water for backfill use.

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2.6 If possible, give prior notice as applicable. to operations, chemical lab, health physics, or other crafts, for their needed assistance and involvement. The chemist probably can help identify a good source of fill water.

2.7 Inform the SR0 what is to be done'and what effect it will have.

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2.9 Obtain a radiation work permit (RWP) as required.

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2.10 An MR, SI or IMI shall have been initiated.

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2.11 Working on a reactor protection channe.itrans'mitter) required

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removing the loop from service per Tech Spec using a PORC -

-i approved procedure.

If the performing instruction _does not meet.

4 this criteria, use conditional SI-483. -

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2.12 Any welding requires an MR issued to the appropriate section for~ #- f ~N initiation of proper welding documents and QA approvel per

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NOTE:

CTMT sump level XMTRS are class G filled systems..

PZR LVL XHTRS are class B, except for the " fill

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(See Ref. WP #10879) 3.0 PRECAUTIONS e

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3.1 When working on instruments listed in Appendix E, special precaution's

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-should be taken to prevent fluctuations or draining of sensing lines common to safety grade instruments. Such perturbations in the pro-tection grade instrument sense lines may cause an~ engineered safeguards i

system actuation or a reactor trip.

3.2 This procedure can present possible exposure to high pressure fluid and/or radiation hazards. Observe all applicable safety and health 4

physics precaution and procedures. Backfilling and flushing may be performed with the unit or equipment out of service or with the unit or equipment operating. This is dependant upon the specific situation, timing, instrument service and access. The procedures and precautions are about the same except low or lack of pressure could permit adjust-i j

ment of caution accordingly.

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SQNP IMI-118 Page 3 of 7 Rev. 5 3.3 Wear suitable protection. Avoid unnecessary exposure to possible

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contaminated process fluid or its contact with equipment-.

3.4 Do not spill fillingo'r process fluid on the floor or elevations below, creating a safety or health hazard, and possibly damaging equipment.

NOTE:

Most sensing line drains are routed to an open or closed drain system. Vents on the instrument or line usually will.'

not have this provision. Provide a. catching vessel and

~ lastic covers as necessary., Clean up any accidental spills.

p and/or request assistance as applicable.

3.5 Tools or equipment being. removed from contaminated areas or otherwise potentially contaminated, shall be contained in plastic or surveyed by health physics prior to transporting through a regulated ~z'one. "'..

3.6 If there should be any questions or unusual events, contact as.appli' cable, SIMF, SR0 and HP.

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1 4.0 INSTRUCTIONS

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4.1 Take container for backfill water to previously identified-DI water If this source is not being actively used, drain the water

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source adequately before use.

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.4 4.2 Perform SI-483, if necessary, to remove an'y reactor protection -

j channels from service.

(See 2.11)

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4.3 Contact H-P prior to entering any C-zone.

i 4.4 Use attached configuration data sheet for transmitter isolation and backfill or flush.

(Obtain more copies as needed from plantservices).

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4.5 Remove selected transmitter from service as follows:

4.5.1 Pressure

Close shutoff valve at instrument

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4.5.2 Differential pressure:

(a) Close high side manifold valve, slowly open equalizing valve and close low side manifold valve.

(b) Close and open isolation valves at source (header, tank, etc.) as necessary.

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SQNP IMI-118 Page 4 of 7 Rev. 5

4.6 Draining

4.6.1 If only draining or de pressurizing at instrument, close line shutoff valve (s) near instrument and close source isolation valve if security of an extra valv'e is necessary.

If draining complete line back to the source,'close isolation valve at the " source" (header, tank, etc.) instead of the li.ne shutoff near the instrument. NOTE:,0perators.may be, required to handle the above " source valves.

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4.6.2 Slowly open drain valve to the drain system or to a container-if there is no drain system. Then open instrument shutoff valve (with d/p open both manifold valves with equalizer al-ready open) with nearby line valve (s) closed, to drain medium trapped in the instrument.

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4.6.3 If contaminated sensing line fill medium is probable, it is

preferred to backflush,.or air purge when gas process, back toward the process source (see item 4.7 backfill below) prior to draining.

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On occassion it may be necessary to cautiously' drain instead s:

of backfilling possible contaminated lines,,due to ope ~ ating r

limitations, or to prevent a hazard to workmen at the source (higher elevation).during an outage. Monitor the drain.for, :_,. a, excessive radiation, if necessary. Step back from proximity '.,--

while draining. Dead-end or low points in sensing lines ex-posed to low level radiation m'ay have settled out sediment.

When drained this can flush out as a " slug" concentrated to a much higher level of radiation. Manipulation of~the shut-off valves for a flush from the process source (pressurized or higher elevation) may be advisable.

s, 4.6.4 After draining, disconnect lines at instrument, if.

necessary. Break connections carefully if there was a closed drain system and drain flow was not visually -

checked.

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.a 4.6.5 Repeat as necessary if there are other affected instru-ments on a common line.

4.6.6 Backfill and vent instruments in an application with a wet leg, before returning them to service.

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SQNP IMI-118 Page 5 of 7 Rev. 5

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4.7 Backfilling and Venting:

4.7.1 Instrument is out of service (or instruments if on a common line) per item 4.5 and'has been de pressurized or drained per item 4.6 (instrument valve open or d/p

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manifold valves open and equalized) and line valve near instrument closed, and source shut off valve open.

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4.7.2 If unit is down verify that,it'is safe to force water ~

back to the process sensing line. source connection.

4.7.3 Connect backfill pumps as shown in Figure 1 (selected per item 2.4) either to fill through, (1) A suitable drain connection, or (2) The' test tee between the instrument and the line shut-off valve near the instrument, or (3) the instrument body.

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Backfilling through the instrument is not 1

preferred due to the need for additional venting after disconnecting the backfill -

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equipment.

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1 EACKFILL PUMPING EQUIP! G R%

~ER SIGHT G LASG R

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SQNP IMI-118 Page 6 of 7 Rev. 5 4.7.3.1 Priming the Pump Open bypass valve in fluid outlet line. Set air regulator for zero pressure. Crack open speed control valve, approximately k open position.

Slowly increase air regulator setting and allow pump to cycle at. twenty to thirty strokes per.

minute.

Close bypass valve gradually. If adequately primed, pump will begin to, cycle.

slower due to increase in out put pressure.

4.7.4 Apply a small amount of backfill water pressure or head and

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open the backfill isolation valve. Output liquid pressure can be controlled quite accurately by regulating the drive -

air pressure.

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4.7.5 Increase the backfill water pressure a sufficient amount to~~

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overcome any process head or prcssure'and slowly open the drain valve if using that connection, and the line isola-tion valve near the instrument. Verify sufficient flow by visual indication of decreasing level. in the backfill water-7:

reservoir. Refill'the backfill reservoir with DI' water ai required. ~

3 4.7.6 If sensing line fluid is contaminated or beEieved contam

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inated, backflush the system a sufficient time period to

?;... a, safely purge contaminates. See Item 4.6.3.

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4.7.7 Report any unusual occurance t'o the SRO and SIMF.

4.7.8 Crack open instrument vents (or loosen connections if no vents) and bleed water until clear and free of air.

Close vents or tighten connections. Repeat for other affected instruments on a common line.

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4.7.9 If sensing line(s) high point vint(s) is (are),available,.

place a catch vessel under it.

Do not spill water.

(NOTE: High point vents may not be shown on drawings.)

Crack open the sensing line(s) high point vent (s) and bleed until clear and free of air. ' secure vent (s).

4.7.10 After sufficient backfill, close sensing line valve (s) near instrument (s) increase backfill pressure to a slight positive pressure, and close instrument shut-off valve or d/p manifold -

valves, leaving equalizing valve open.

4.7.11 If filling through drain, close drain valve, zero backfill pressure and disconnect backfill equipment.

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i-SQNP-IMI-118 Page 7.of 7-Rev. 5 1

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4.7.11 Continued If fill was through a test ' tee, disconnect the backfill con-nection while maintaining a slight flow, and place a catch vessel under the connection. fero backfill pressure. Cap the test tee loosely and crack the sensing line valve above the tee for a slight bleed while tightening the test tee-cap, losing only a small amount of fill head.. Secure the backfill.

equipment.

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NOTE: Instruments connected to-non-conta'minated process -

fluids may be bleed and vented a small amount from

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a pressured process. Care should be excercised with steam applications, to. avoid overheating sensing lines. Allow cooling time for steam condensation before placing instrument in service.

4 4.8 Complete configuration data sheet per AI-37, whil~e returning

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l-transmitter to service as follows:.

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j 4.8.1 Isolation valve (s) at sensingfline source is.open, s' hut-off -

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j valve (s) in sensing line'near instrument is closed and 5

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instrument shut-off. valve (s) are closed (d/p equalized).

j All vents and drains are closed.

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l 4.8.2 Slowly open sensing line valve (s) near instrument.

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4.8.3 Slowly open instrument shut-off ' valve or if d/p devicei' Slowly open the high side manifold valve,'close.the equ'alizing valve and slowly open the low side manifold valve.

j 4.8.4 Repeat for other affected instruments;on a common line.

i 4.8.5 Inspect all connections for leaks. Clean up the area and..

j remove equipment and any trash or foreign material.

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4.8.6 Catch vessel should be emptied into a suitable safe drain system.

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4.9 Sign and date configuration data sheet (s). Attach to initiating j

instruction.

4.10 Complete any other necessary work related to this-loop and governing instruction (IMI, SI, MR).

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4.11 Return loop to service using initiating instruction.

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._.a, i-..s-5 SQNP IMI-118 - Units 1 & 2 t

Configuration Data Sheet Page 1 of 1 Rev. 5 EQUIPMENT REQUIRED ACCURACY CAL. DUE DATE TVA NUMBER

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CONFIGURATION CHANGES RETURN TO NORMAL

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REMARKS / COMMENTS:

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Performed By Date

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and Date 4

I.M.

Approved By Date Instrument Engineer i

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SQNP IMI-118 Appendix B Page l'of 8 Rev. 5-BARTON FILL PROCEDURE

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SCOPE: ' The purpose of this Appendix is to outline a procedure for filling ITT Barton filled liquid level' systems.

(1) Adheretoallapplicableprerequisites, precautions,End I

instructions of IMI-118 for flushing possible contaminated-sensor bellows.

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DEFINITIONS:, Sensor Assy - (sensor bellows) The device whi~ch acts as the pressure transmitting isolation between the primary plant process and the intermediate (fill) fluid.

BellowsProtector-Splitspacer'a'semblyinItalledaround s

the bellows to protect it from damage from large pressure variations during the filling process on the system..

Differential Pressure Electronic Transmitter - (D/P unit or D/P cell) A device which provides an electrical signal..

proportional to differential pressure for transmission to ~

remote locations.

Instrument Panel - A fixture used to permanently mount the D/P transmitters.

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Fill Fluid - Distelled H 0, oil ~or any other medium used as

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anintermediatetransmitSssionbetweensensorassyand

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transmitter D/P cell.

INSTRUCTIONS 1.0 PREREQUISITES

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1.1 VACUUM PUMP:

Check oil level, add or change if necessary.

Change oil frequently as foam shows in oil sightglass.

1.2 FILL LIQUID:

Obtain appropriate fill flu /4 Nhe water filled systems may be filled with demin water) and boil 'cr ive (5) minutes to deaerate.

(Boiling the fluid should improve varau1 ler + ition.) Cool after deaera-tion and transfer to fill bottle. C@ w -peration by evacuating bottle and fluid together until fluid is completely deaerated (E 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />).

1.3 SENSOR PREPARATION: RemovehousingandinspectbellowsfordaEge.

Replace sdasor is necessary. Test for plugged capillary connections by applying a very low air pressure to the housing port of the DP unit.

Hold bellows to prevent excessive extension to bellows being tested.

Air pressure should not exceed 0.5 psi; blowing into.the tygon tube is recommended. If the installation is correct, the sensor bellows will expand slightly. Remove pressure and install split-spacers on sensor bellows. Retain spacers in place with an elastic bank or tape.

Install protective spacers on sensor' bellows anytime bellows are removed from housing unless otherwise stated. ' ya..

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IMI-118' Appendix B Page 2 of 8

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Rev. 5 1.4 FILL VALVES:

If fill' valve cap screws have been welded, the complete '.- '

' fill valve assembly will need to be replaced.

If'none are available grinding the cap screws off may be attempted. Replace any valve stems that have been used, or show excess weak.

1.5 While under vacuum tygon tubing inherently releases gas-for a period of time.

After this initial off gasing no more gas is given off. '

New tubing should be evacuated in the shop to remove this-gas.-,

1.6-Connect the system as shown in figure"1:or 2 as appropriate. All tubing connections should be clamped or.lockwired to prevent air leakage.

Tubing lengths should be as short as possible..Use R3603 thick wall-tygon tubing that is clean and dry. High vacuum grease (silicon) may be used to lubricate connections to prevent air leaks.

NOTE:

When connecting the system,. verify that fill bottle is tilted as shown in the Figures, and that fill fluid does

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not cover the bottle's lower tap when tilted nor enter the pump suction line.

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1.7 The fill bottle must be at a' higher elevation than the sensof,'~(or'the

' highest part of the system to beLfilled). 'This elevation should be at least two feet but should NOT exceed 120 feet.

If the fill bottle must i

be placed below any part of the sensor / capillary tubing, the bottle -

must be pressurized to properly fill the sensor.. Apply pressure at. 3 vent, I psig per 2 feet elevation.

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1.8 The valve stem back-up ring must not be of.teflo' n material.'

(See parts list) i 1.9 _ Coordinate building of temporary scaffolding where needed including i

a platform to mount fill bottle 2 feet above highest part of system.

1.10 Evacuating an existing filled system requires the transmitter,

- capillary tubing and bellows to be completely dry.

A water filled system can be purged with N2 through the upper.

a.

and lower fill valve assemblies. Ensure pressure is <10 psig with valves removed from fill valve assemblies.

A small amount of alcohol in the capillary tubing may help with water dispersion.

b.

A oil filled system can be cleaned by disassembling the transmitter housing and using a suitable solvent to clean the bellows and capillary tubing. - Remove the sensor bellows from the capillary before cleaning then dry in oven.

(Ensure a new bellows is available before removing the old one.)

1.11 Direct communications between transmitter and sensor bellows locations is'necessary to perform this procedure.

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SQNP IMI-118 Appendix B Page 3 of 8 Rev. 5 2.0 PREPARE SYSTEM FOR EVACUATION 2.1 Install spacers on sensor bellows and secure in place.

(Ensure spacers are correct size and a matched pair.)

2.2 Remove all fill' valve assembly cap screws. Remove valve stems from

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" fill" side of fill valve assy. Open (do not remove) valve stems-on " isolation" side of fill valve assy.

(0 pen until valve stem is flush w/ valve body.)

3.0 SYSTEM EVACUATION 3.1 Open valves 1, 2, 3, 4 5.

Start pumps.

4 3.2 Leak down test After approximately 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> perform system leak-down test:

1.

Isolate valve 3 and compare vacuum meter "A" with "B".

Neither meter should decrease faster than the other, which would indicate a system leak in the area of the fastest decreasing ~ meter.

2.

If no problem; open valve 3 and close valve 5, check both meters again:

if no problem open valve 5 and continue.

3.3 Pull vacuum approx 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> until both vacuum meters read.1mm/Hg.

3.4 static Leak Test Close valves 3 & 5 and observe vacuum meters, vacuum should not change more than 0.2 mm/Hg in one (1) minute.

(i.e., if vacuum recches

.08mm/Hg in step 3.3, then meter should not exceed.28 mm/Hg after one minute.)

A change >.2 mm/Hg per minute indicates a leak and steps to correct it should be taken.

If this test passes, open valves 3 & 5 and

. continue with fill procedure.

4.0 SYSTEM FILL 4.1 Once the system reaches an acceptable vacuum, rotate fill bottle from the position shown in Figure 1, to the Figure 2 position.

NOTE:

Use caution in handling bottle. Do not allow fill fluid to enter the pump suction line.

4.2 Close valve 2, close down on valve 4 but not all-the-way.,,

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r SQNP IMI-118 Appendix B Page 4 of 8 Rev. 5 4.0 SYSTEM FILL

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4.3 Cut tygon between bottle and valve 2 (Point A) fill will start; when fluid appears at valve 4, (sensor end), close valve 4 immediately.

4.4 Turn vacuum pumps off, close valve 5 and allow system to settle for 30 minutes.

5.0 BELLOWS EQUALIZATION Isolate fill valve assy by closing "B" ko approximately 10 ft-lbs 5.1 using 1/8" Allen Wrench.

5.2 Isolate fill valve assy.by closing "C" snuggly.

5.3 Disconnect TYGON at point"D" and raise above bellows.

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5.4 Open fill valve assy "C".

Ensure.end of TYGON "D" is above bellows.

5.5 Lower and raise point"D" to equalize pressure in bello.ws. When bellows pressure is equalized, the fluid level in the TYGON will be level with the center line of the bellows.

5.6 Isolate fill valve assy "C" to approximately 10 ft-lbs using 1/8" Allen Wrench. Bellows protectors should rotate freely to indicate

p. roper fill and bellows pressure.

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6.0 FINISHING-UP 6.1 Close valve 1, disconnect fill bottle at "A".

6.2 Remove TYGON from fill valve assembly "B" and "C".

6.3 Install valve (less "0"-ring and back-up ring) into TYGON side of fill valve assys, "B" and "C".

Close tightly.

I NOTE:

Remove any excess fluid from assy prior to installation if necessary.

6.4 After ensuring bellows "0" ring is free of defects and properly lubricated, reinstall sensor bellows in bellows housing being carefull not to damage bellows.

Secure bellows in housing with either snap ring or Allen head screws provided.

6.5 Verify proper operation of instrument, using provided instruction, before disassembling fill set-up. - ~. ' nnx =

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SQNP IMI-118 Appendix B Page 5 of 8 Rev. 5 6

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'CAPlLLARY SYSTEM WITH SEN SOR BELLOW 5 ABOVE TR AN S d41TTE.R MO b **

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SQNP IMI-118 Appendix B Page 6 of 8 Rev. 5

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FILLED CAPlLL ARY SYSTEM WITH SEN SOR BELLO %/ S BELO\\V TRAW5MiiiER 1

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SQNP IMI-118 Appendix B i

Page 7 of 8 Rev. S CAP,SWAGELOCK APPROXIMATE DIMENSION 600-P 316 em 500 PSI =

T h 3000 PSI = 3.5 ADAPTER l1 lj h

600-1-4-316 m

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SENSOR ROUSING

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(500 OR 3000 PSI)

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S-573 SQNP IMI-118 e

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Page 8 of 8 i

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Rev. 5 M ETAi. -..

s 1/4 OD.' -

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s s

.' -,! L Tygon 5/8 oD Tygon 3/8 oD Tubing '

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x 3/8 ID x 1/4 ID 3

emove Valve Tubing" Clamps :

ouR No: Fit.L CPERAT:CN OR ! CCKWIRE p

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' Valve Open"Positi n, A

oMt.TO TWO.THREADG} EXPOS ED.

Durine Fill Operation

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Rem'ove Tygon, Observe for Internal Leakage i!

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OF FILL FLUID DURING PROOF-PRESSURE TEST f

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a Close Valve,(1/8" Hex Wrench) Approx.10 Ft 'LBS7 Hold Valve Body to. Prevent l (

Tube-Strain.

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B Tests of Capillary System (Proof Test & Calibration) 2ND WELo -- REMOVE O-RING AND TEFLON.

b INSEstr VALVE. (REMOVE LICdlD TO bd ALLOW VALVE TO CLOSE FULLY),

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CLOS E VALVE TIGHTLY.

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i Seal-Weld.(WELD R0o TYPE ~108 6R 316

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$TAfhLEss). AVoto exCtss HEAT, COOL d

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c DODY lF NECESSARY.

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C Figure.4 5-573 FillConnections

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SQNP IMI-118 Appendix C Page 1 of 5 Rev. 5 BARTON " TOP OFF" PROCEDURE SCOPE The purpose of this instruction is to outline a procedure for topping off

~

Barton-filled liquid level systems.

_, PRECAUTIONS AND PREREQUISITES Adhere to all applicable prerequisites, precautions, and instructions of IMI-118 for flushing possibly contaminated sensor bellows.

DEFINITIONS I

Sensor Assembly (Sensor Bellows) - The device which acts as the pressure transmitting isolation between the primary plant. process and the inter-mediate (fill) fluid.

~

Bellows Protector - Split spacer assembly installed around the bellows to protect it from damage from large pressure variations during the. system filling process.

~'

Differential Pressure Electronic Transmitter (D/P Unit or D/P Cell) - A

~

device which provides an electrical signal proportional to differential pressure for transmission to remote locations.

Instrument Panel - A fixture used to permanently mount the_D/P transmitters.

Fill Fluid - Distilled H 0, oil, or any other medium used as an intermediate 2

transmission between sensor assembly and transmitter D/P cell.

INSTRUCTIONS 1.0 Equipment Preparation 1.1 -Vacuum Pump (s): Check oil level; add or change oil if necessary. -Change oil frequently as foam shows in oil sightglass.

1.2 Fill Liquid: Obtain appropriate fill fluid and transfer to fill bottle.

Deaerate by evacuating bottle and fluid, while gently heating fluid (s 85*-90*F) until fluid is completely deaerated (2 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />).

1.3 Sensor Preparation: Remove housing and inspect bellows for damage. Retain -

spacers in place with an elastic band or tape.

Install protective spacers on sensor bellows any time bellows are removed from housing unless otherwise stated.

1.4 While under vacuum tygon tubing inherently releases gas for a period of time. After this initial off gasing, no more gas is given off. New tubing should be evacuated in the shop to remove this gas. ;y

SQNP IMI-118 s

Appendix C Page 2 'of 5 Rev. 5 INSTRUCTIONS (Continued) 1.5 Connect the system as shown in Figure 1.

All tubing connections'should be clamped or lockwired to prevent air leakage. Tubing lengths should be as short as possible. - Use R3603 thick wall tubing that is clean and dry.

Hi.gh vacuum grease (silicon) may be used to lubricate connections to prevent air leaks.

NOTE:

Whenconnectingthesystem,verifythatfillbottleis.t[lted as shown in Figure 1, and that fill fluid does not' cover the bottle's lower tap when tilted, nor enter the pump suction line. _

1.6 The fill bottle must be at a higher elevation than the sensor (or the highest part of the system to be filled). This elevation should be at least two~

feet, but should not exceed 20 feet.

1.7 The valve stem backup ring must not be of teflon material'(see p' arts list).

1.8 Coordinate building of temporary scaffolding where needed., including a platform to mount fill bottle 2 feet above the highest part,of the system.

~

1.9 Direct communications between transmitter and sensor bellows"locati6ns is necessary to perform this procedure.

2.0 Prepare System For Evacuation 0

2.1 Install spacers on sensor bellows and secure in place.

(Ensure. spacers '.,-

are correct size and a matched pair.)

2.2 Remove all fill valve assembly capscrews. Remove valve stems from " fill" side of fill valve assemblies.

NOTE:

DO NOT open the " isolation" side of the valve assembly (see Figure 2).

3.0 System Evacuation 3.1 Open valves 1, 2, and 3 and start vacuum pump (s).

3.2 After pumps have run for 30 to 45 minutes, open " isolation" side of valve assembly (reference Figure 2).

3.3 Pull vacuum for approximately 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or until the vacuum meter reads

< 0.2 mm Hg.

1 [

I

SlNP 1(I-118

/ppendix C-Iage 3 of 5 4 ev. 5 3.4 Static Leak Test

^

t Close valve 3 and observe vacuum meter. The reading should not change more than 0.2 mm Hg in one minute (i.e., if the vacuum reaches 0.08 mm Hg in step 3.3, then the meter should not exceed 0.28 mm Hg after one minute).

A change > 0.2 mm Hg per minute indicates a -leak, and steps to correct it

+

should be _taken. If the system passes the test, open valve-3 and continue -

with this procedure.

4.0 System Fill

~

~

4.1 Once the system reaches an accept'able vacuum, rotate fill-bottle from the position shown in Figure 1, to the Figure 1A position.

NOTE:

Use caution in handling bottle. Do not allow fillLfluid to' enter the pump suction line.

]

4.2 Close valve 2.

4.3 Cut Tygon tubing at point '.'A".-

Fill.will' star't.

~

1 i

4.4 Turn off vacuum pumps and allow system to settle for 30 minutes.

I 5.0 Finishing Up l

j 5.1 Close valve 1.

- ]-

~"

~

5.2 Close fill valve assembly by closing isolation valve. "B" to approximately j

10 ft. Ibs. using 1/8" allen wrench.

f-5.3 Remove Tygon tubing from fill valve assembly.

5.4 Install valve stem (less "0" ring and backup ring) into valve assembly'.

fill valve "A" and close valve tightly.

If valve stem shows excess.

wear, replace with new stem.

NOTE:

Remove any excess fluid from assembly prior to stem installation if necessary.

3 5.5 After ensuring bellows "0" ring-is free of defects and properly lubricated, reinstall sensor bellows in bellows housing being careful not'to damage bellows.

Secure bellows in housing with _ either snap ' ring or Allen head screws provided.

5.6 Verify proper operation of instrument using calibration and response time instructions before disassembling fill setup.

l 1

4 i

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w L

SQNP IMI-118 Appendix C Page 4 of 5 Rev. 5 k

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FIG.lA NAsTipss vAo

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fA V

V VAC PHP- -- -

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2.

3 i

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y FILL BOTTLE

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. Any number of.

.- pomps may be used aN g

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. - +

5 a

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C"E I

~~ ~ ~ FIGu R.E 1

FILLED CAPILL ARY SYSTEM

\\VITH SEN SOR BELLO \\V S BELow TR Ah! 5 M I i i ER -

FC L.,

d SQNP IMI-118 Appendix C Page 5 of 5 Rev. 5

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FIGURE 2,

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SQNP IMI-118

' Appendix D Page.1 of 2 i

Rev. 5 4

EQUIPMENT AND MATERIALS LIST A.

(2) vacuum pumps,. minimum, SAR-VAC Model No.'8804-B Sargent-Welch Scientific Co. or equal.

B.

(2) gallons vacuum pump oil tl C.

Vacuum gauge, Hastings Raydist 0-20 MM hg expended s'cale Model No. VT-4B.

D.

Vacuum grease E.

(2) vacuum probes, Hastings DV-40 metal (or equal) -

F.

Transmitter calibration regulator and standard gauges G.

Sound power or equivalent communication system.

H.

(3) fill bottles - 1 gallon capacity.

I.

100 ft. vacuum hose 1/2" 0.D. x 1/4" I.D. x 5/8" wall i

J.

(12) 3/8" tubing clamps, screw type

~

K.

(12) 3/8" tubing tee's

+-

L.

Miscellaneous swagelok fittings M.

Funnel N.

50 ft. 1/2" nylon rope 0.

Masking tape I

P.

Tablet and pencils Q.

Assorted Phillips screwdrivers l

R.

Bellow protects S.

Bellow sensor housing 0-rings T.

Bellow sensor cap. screws U.

Valve stem 0-rings 0001.0078.R AYD-378L V.

Valve stem backup rings 0001.1062R Non-Teflon

, - ~. ' % c --

[K l

l SQNP IMI-118 Appendix D Page 2 of 2 Rev. 5

~ EQUIPMENT AND MATERIALS LIST (Continued)

~

~

W.

3" crescent wrench X.

Assorted straight bl'de screwdrivers a

Y.

Pocket knife Z.

Hex wrench set AA.

3/8" ratchet wrench AB.

3/8" drive 5/16" hex socket AC. Tubing cutter AD. Assorted files AE.

6" steel scale with 1/64" graduations

-~

AF.

Flashlight and spare batteries AG. Assorted pliers (electrician, channel-lock, etc.)

AH. Valve stems 353.1011.C AYD-360K

- I '.s J

AI. Valve caps

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AJ. Valve assembly 778.005.Z A

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SQNP IMI-118 Appendix E Page 1 of 3 Rev. 6 Transmitters which have a common sensing line with protection grade Protection grade TVA drawing showing transmitters transmitters affected sensing line connections PT-1-1C (L-250)

PT-1-2A (L-196) 47W600-31 & 92 PT-1-8C (L-253)

PT-1-9A (L-194) 47W600-30 & 92 PT-1-19C (L-252)

PT-1-20A (L-194) 47W600-3.0 & 92 PT-1-26C (L-251)

PT-1-27A (L-196) 47W600-31 & 92 LT-3-43 (L-185)

LT-3-42 (L-185) 47W600-29 LT-3-56 (L-185 LT-3-55 (L-185) 47W600-29 LT-3-98 (L-185)

LT-3-97 (L-185) 47W600-28 LT-3-111 (L-185)

LT-3-110 (L-185) 47W600-29 LT-3-172 (L-417)

LT-3-94 (L-184) 47W600-28 & 294 LT-3-173 (L-178)

LT-3-55 (L-185) 47W600-29 & 294 LT-3-174 (L-178)

LT-3-42 (L-185) 47W600-29 & 294 LT-3-175 (L-417)

LT-3-107 (L-184) 47W600-28 & 294

$ PT-30-310 (L-188)

PDT-30-43 (L-188) 47W600-89 PT-30-311 (L-189)

PDT-30-44 (L-189) 47W600-89 FT-63-91A (L-55)

FT-63-91C (L-55) 47W600-132 FT-63-91B (L-55)

FT-63-91C (L-55) 47W600-132 FT-63-92A (L-55)

FT-63-92C (L-55) 47W600-132 FT-63-92B (L-55)

FT-63-92C (L-55) 47W600-132 FT-68-6A (L-226)

FT-68-6B (L-227),

FT-68-6D (L-228) 47W600-80 FT-68-6B (L-227)

FT-68-6A (L-226),

FT-68-6D (L-228) 47W600-80 FT-68-6D (L-228)

FT-68-6A (L-226),

FT-68-6B (L-227) 47W600-80 j

FT-68-29A (L-226)

FT-68-29B (L-227),

FT-68-29D (L-228) 47W600-80 FT-68-29B (L-227)

FT-68-29A (L-226),

i FT-68-29D (L-228) 47W600-80

$ FT-68-29D (L-228)

FT-68-29A (L-226),

FT-68-29B (L-227) 47W600-80 FT-68-48A (L-226)

FT-68-48B (L-227),

FT-68-48D (L-228) 47W600-80 FT-68-48B (L-22')

FT-68-48A (L-226),

FT-68-48D (L-228) 47W600-80 i

- - - - - - - - - - - - - - - - - - - - - - - - - - - - ~ - -

SQNP IMI-118 Appendix E Page 2 of 3 Rev. 6 Transmitters which have a common sensing line i

with protection grade Protection grade TVA drawing showing transmitters transmitters affected sensing line connections FT-68-48D (L-228)

FT-68-48A (L-226),

FT-68-48B (L-227) 47W600-80 3)F PT-68-66 (L-340B)

LT-68-370,371,372 (L-340A,B) 47W600-287 PT-68-69 (L-388)

LT-68-367,368,369 (L-388) 47W600-287 FT-68-71A (L-226)

FT-68-71B (L-227),

FT-68-71D (L-228) 47W600-80 FT-68-71B (L-227)

FT-68-71A (L-226)

FT-68-71D (L-228) 47W600-80 FT-68-71D (L-228)

FT-68-71A (L-226),

FT-68-71B (L-227) 47W600-80 LT-68-300 (L-366)

PT-68-301 (L-181, PT-68-311C (L-181) 47W600-44 PT-68-301 (L-181)

PT-68-311C (L-181) 47W600-44 PT-68-311C (L-181)

PT-68-301 (L-181) 47W600-44 LT-68-312C PT-68-301, l

PT-68-311C(L-181) 47W600-44 LT-68-320 (L-63)

PT-68-322 (L-64),

i p

PT-68-323 (L-63) 47W600-172,285 LT-68-321 (L-62)

PT-68-334 (L-62),

LT-68-335 (L-62) 47W600-172,285 PT-68-322 (L-64)

LT-68-320 (L-63),

~

g PT-68-323 (L-63) 47W600-172,285 PT-68-323 (L-63)

LT-68-320 (L-63),

PT-68-322 (L-64) 47W600-172,285 LT-68-325C (L-179)

LT-68-339 (L-179),

PT-68-340 (L-179) 47W600-172,285 LT-68-326C (L-179)

LT-68-339 (L-179),

f' PT-68-340 (L-179) 47W600-172,285 I

$ PT-68-334 (L-62)

LT-68-335 (L-62) 47W600-172,285 i LT-68-335 (L-62)

LT-68-334 (L-62) 47W600-172,285 i

16 PT-68-336C (L-180)

LT-68-339 (L-179),

PT-68-340 (L-170) 47W600-172,285 f PT-68-337C (L-180)

LT-68-339 (L-179),

i PT-68-340 (L-179) 47W600-172,285 f PT-68-338 (L-274)

PT-68-334 (L-62),

LT-68-335 (L-62) 47W600-138,172,285.

1

SQNP IMI-118 Appendix E Page 3 of 3 Rev. 6 Transmitters which have a common sensing line l

with protection grade Protection grade TVA drawing showing transmitters transmitters affected, sensing line connections Y LT-68-339 (L-179)

PT-68-340 (L-179) 47W600-172,285

% PT-68-340 (L-179)

LT-68-339 (L-179) 47W600-172,285 PT-68-342C (L-180)

PT-68-334 (L-62),

JF LT-68-335 (L-62) 47W600-172,285 F LT-68-367 (L-388)

PT-68-69 (L-388),

LT-68-368,369 (L-388) 47W600-287 LT-68-368 (L-388)

PT-68-69 (L-388, LT-68-367,369 (L-388) 47W600-287 l

LT-68-369 (L-388)

PT-68-69 (L-388),

LT-68-367,368 (L-388) 47W600-287 4 LT-68-370 (L-340A)

PT-68-66 (L-340B),

LT-68-371,372 (L-340B) 47W60-287 4-LT-68-371 (L-340A)

PT-68-66 (L-340A,B),

LT-68-370,372 (L-340B) 47W600-287 LT-68-372 (L-340B)

PT-68-66 (L-340B),

gE LT-68-370,371 (L-340A) 47W600-287 i

i l

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N 5

ENCLOSURE 3 SEQUOYAH NUCLEAR PLANT 4

INSTRUMENT SENSING LINE SLOPE QUESTIONS s

TECHNICAL SPECIFICATION TRANSMITTERS I

ASSOCIATED WITH NEW MAINTENANCE INSTRUCTIONS 19.1.1 THROUGH 19.1.15 q

(Currently being written by TVA) 1 i

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TENNE 20EE VALLEY AUTHORITY Cwast E

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or SUBJECT Yb ! AWllf//Alf 'rT/WMMG ff $r'fd PROJECTS)fCrf*/f t /Nd ei; 5 6?vsa/N FS l CP) blB%CAI 2 // A 7 bM TT2 4 r

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f*T-$ $ - 4 A (L - 2 2f.>

FT 68 N -227b F T 6h D -228

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F7*-68-29/1 N-226 fn 68 298 6-727 fT-45'290 & -22 FT-6f.19/1 &-224 FT-48-4!fB h -227}

fr-te - 98o 6 -228)

FT-49-7/A (L -22 )

fT-68-- 7' 8 N -22 7 FT-in-1/D b.-228)

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Pr 32.2 & - 472)

P7-68-3 2 3 6 - f5+),

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9 4

e ENCLOSURE 4 SEQUOYAH NUCLEAR PLANT INSTRUMENT SENSING LINE SLOPE QUESTIONS SENSING LINE AIR BUBBLE NIGRATION TESTS FOR WATTS BAR NUCLEAR PLANT REPORT NO. WR28-1-85-121 I

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