ML20138K336

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Rev 10 to OI 17, Letdown Gas Stripper Operation
ML20138K336
Person / Time
Site: Point Beach  NextEra Energy icon.png
Issue date: 01/25/1997
From:
WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML20138K159 List: ... further results
References
OI-17, NUDOCS 9702180164
Download: ML20138K336 (17)
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' NUCLEAR POWER BUSINESS UNIT 0117 OPERATING INSTRUCTIONS MINOR  ;

Revision 10 LETDOWN GAS STRIPPER OPERATION January 25.1997 Date RECORD DSS PROCEDURE VERITIED CURRENT AND CifLCKED f OR TEMPORARY CHANGE 5 IF FIELD COPILS RLQUIRED. USE PDF4026s IAW NP t J 4 AND DO g COMPLETE Till5 BLO(1 Units 1 & 2 By: DATE:

1.0 PURPOSE To outline operation of the 80 gpm letdown gas strippers, its cryo support systems (cryo compressors and chiller), and to recover from an actuation of radwaste component cooling isolation.

2.0 IREFERENCES IR 96-006, NRC Inspection Report, NRC Commitment for Operations procedure PMT/QC reviews.

3.0 PRECAUTIONS AND LIMITATIONS 3.1 A Unit 2 containment isolation will cause LW-63 and LW-64 to close. This will isolate component cooling water to the radwaste system.

3.2 When either LW-63 and/or LW-64 leave the full open position, the following equipment will trip or close:

K-10A Cryogenic Gas Compressor Trip Off K-10B Cryogenic Gas Compressor Trip Off P-130A Letdown Gas Stripper Cire Pump Trip Off P-130B Letdown Gas Stripper Cire Pump Trip Off P-137 Aux Condensate Return Pump Trip Off RS-SA-1 Radwaste Steam Supply Control Valve Trip Close To respond to an isolation and auto shutdown ofletdown gas stripper and cryogenic compressor, GO TO STEP 5.6.

3.3 The gas strippers shall not be operated with supply and/or return valves crossconwted.

3.4 Prior to operation of either gas stripper, the cryogenic system must be in operation and aligned per CL-9J.

3.5 All manual valves are prefixed "l " or "2 " to denote unit. All control valves are suffixed with an "A" for Unit 1 or "B" for Unit 2.

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'" NUCLEAR POWER BUSINESS UNIT OI17 OPERATING INSTRUCTIONS MINOR Revision 10 v LETDOWN GAS STRIPPER OPERATION January 25.1997 3.6 Steam supply will be taken from either unit but not both. Condensate retum will be to the

, condenser of the unit supplying the steam, except for short periods during inservice testing which necessitate radwaste steam supply isolation. During these periods condensate may be left to the unit being tested for the period of the test.

l 3.7 The gas stripper can be shut down rapidly in the event of an emergency by closing the preheater outlet TCV GS-GW-1 A(B). More rapid cool down is available by opening GS-GW-5A(B) which controls cooling flow to the stripper condenser. However, do not draw a vacuum in the gas stripper.

i 3.8 The following valves related to these systems are locked shut for the reasons indicated.

3.8.1 IGS-17 (2GS-17) cryogmic unit bypass to the Unit 2 containment purge stack. This valve permits bypassing the cryogenic unit which removes certain radioisotopes of noble gas from the stripper output and permits the gas to be diverted directly to the atmosphere.

3.8.2 IGS-19 (2GS-19) HX-135 vent cooler drain loop seal bypass valve. This valve pemiits bypass of the steam seal on the discharge of the vent cooler leading back to the gas stripper.

3.8.3 1GS-61 (2GS-61) nitrogen purge inlet on the gas stripper reliefline penetration. This open ended vent line is provided to give a preoperational purge replacing air in the stripper with a blanket of nitrogen.

4 3.8.4 IGS-36 (2GS-36) stripper outlet cross-connect valve. This valve permits cross-connection between Unit 1 and Unit 2 primary letdown by permitting stripper discharge into the other unit from which it is fed.

3.8.5 IGS-16 pOS-16); IGS-20 (2GS-20) stripped gas lines vents. This valve  !

permit release of contaminated gas to the atmosphere.

3.9 Health Physics should be informed if Unit 1 or Unit 2 gas strippers are off-line for an extended period of time.

1 3.10

~~

Following a unit outage, the letdown gas stripper system should not be placed in service until the fuel conditioning is complete, and the RCS nitrogen inventory is reduced to an acceptable level and verified by chemical analysis. An acceptable nitrogen concentration is reached when daily VCT gas space analysis contains less than 10 percent nitrogen without an interim purge of the VCT gas space and with a normal letdown lineup.

Nitrogen is removed by purging the VCT to the vent header / gas decay tank system. The letdown gas stripper system does not permanently remove nitrogen; rather it dilutes and redistributes the nitrogen ytween the operating units.

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,, NUCLEAR POWER BUSINESS UNIT 0117 OPERATING INSTRUCTIONS MINOR Revision 10

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LETDOWN GAS STRIPPER OPERATION January 25.1997 3.11 When the stripper is shutdown for maintenance, the cire pump, P-130A(B) breaker must be closed (P-130A(B) may be stopped) or GW-17A(B) control switch must be in HAND.

If the breaker is open, i.e., for pump maintenance, the circ pump thermal overload interlock will cause GW-17A(B) stripper gas outlet to close (in Auto). This will prevent the cryo system gas from backfeeding the stripper as it cools.

4.0 INITIAL CONDITIONS 4.1 Verify panel mounted recorders on C-60A/B are on.

4.2 The letdown gas stripper is aligned per CL-9E. The cryogenic system is aligned a per CL-91.

, 4.3 Radwaste steam is available.

5.0 PROCEDURE l 5.1 Startun To Hot Standby 5.1.1 Start K-10A and/or K-10B cryo system compressors per Section 5.5 to maintain gas strippers gas pressure.

5.1.2 Open 1GS-39(2GS-39), water return from cryo system moisture separator HX-138A(B).

5.1.3 Start 1 P-130A(2P-1308) gas stripper circulating pump.

5.1.4 Place TICK-GW-1 A(B) preheater temperature controller in manual and shut.

Open RS-44(30) and slowly open RS-45(31) to admit steam to preheater HX-132A(B).

5.1.5 Ensure GS-GW-17A(B) vent cooler outlet TCV is in auto and open.

5.1.6 Place PICK-GW-5A(B) condenser pressure controller in manual and open, to maintain gas stripper pressure as low as possible during heatup. _

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,, ' NUCLEAR POWER BUSINESS UNIT 0117.

OPERATING INSTRUCTIONS MINOR Revision 10 LETDOWN GAS STRIPPER OPERATION January 25.1997 3a.

NOTE: During heatup of the gas stripper, the gas inventory willincrease in either the opposite units VCT(PCV-158 not in service) or in the cryo system decay tanks (PCV-158 in service). In either case, venting ofthe VCTon the opposite unit willbe needed. l l

5.1.7 During heatup of the gas stripper, gas will be displaced to the cryogenic system. Cryo system response depends upon the VCT gas system lineup on the opposite unit.

a. If the ocoosite unit's gas stripper is on-line and the opposite unit's VCT fine control regulator, PCV-158 is in service, then pressure will increase in the cryogenic delay tanks. Periodically vent that unit's VCT to maintain cryo compressor discharge pressure <80 psi.
b. If the opoosite unit gas stripper is on-line an_d the opposite unit VCT f'me control regulator PCV-158 is p_qt in service, then pressure will increase in the VCT. Periodically vent that unit's VCT to maintain VCT pressure <30 psi.
c. If the opposite unit gas stripper is not on-line, opening of CV-261C cryo return may be required along with venting of the VCT if cryo compressor discharge exceeds 80 psig.

l f

5.1.8 Open TICK-GW-1 A(B) preheater temperature controller manually to establish a heat up rate. Monitor point one on TR-GW-30A(B) gas stripper temperature controller during heat up. Control heat up rate to within the capacity of the cryo compressors as monitored on PICK-GW-5A(B), condenser pressure controller.

5.1.9 Heat up to 258*F, then place TICK-GW-1 A(B) in auto at the 258* setpoint.

5.1.10 Place PICK-GW-5A(B) in auto when it reaches its setpoint of 2.15 psig.

l 5.2 Hot Standby To On Line 5.2.1 If required, sample the letdown gas stripper to determine the boron concentration.

5.2.2 Verify GS-GW-73A(b) control switch on C04 is in the local position.

5.2.3 . If plant conditions allow, have the control operator go to one crifice if two orifices are on line.

5.2.4 Place the gas stripper outlet control valve GS-GW-72A(B) in AUTO.

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NUCLEAR POWER BUSINESS UNIT 0117 OPERATING INSTRUCTIONS MINOR Revision 10

.* LETDOWN GAS STRIPPER OPERATION January 25,1997 la -

  • CAUTION
  • IF THE LETDOWN GAS STRIPPER BORON CONCENTRATION IS NOT THE SAME AS THE UNIT'S RCS BORON CONCENTRATION, PLACING THE LETDOWN GAS STRIPPE.R ON LINE WILL HAVE A REACTIVITY CHANGE.

IF REQUIRED, DIVERT THE UNIT'S LETDOWN TO THE HUT WHILE BLENDING VIA THE MAKEUP SYSTEM AT THE PROPER BORON CONCENTRATION PER OP-58.

i 5.2.5 Go to open on GS-GW-71 A(B) stripper feed isolation valve. This will open -

GS-GW-72A(B) stripped liquid return control valve and shut GS-GW-73A(B) letdown isolation valve, provided preheater temperature is >220 F but <270 F, and level is >41".

NOTE: TICK-GW-9A(B) trim cooler temperature controller is now controlling VCT outlet temperature, and should be set at 115*F.

5.2.6 Stabilize feed pressure at 40 psig with GS-GW-4A(B), recire line PCV.

5.2.7 Stabilize level at 66" with LRC-GW-3A(B) level controller.

5.2.8 Align VCT H gas2 makeup per OP-SD. Ensure that CV-261C is opened.

5.3 Shutdown 5.3.1 Placing the gas stripper in hot standby

a. Go to close on GS-GW-71 A(B) stripper feed isolation valve and/or have the control operator place the gas stripper divert valve control switch to VCT.

! . Control pressure and temperature as needed to maintain standby i

conditions. Level will remain at the level at which the gas stripper was taken offline (assuming no leakage),

c. Align VCT H gas 2 makeup per OP-SD. Ensure that CV-261C is closed.

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" NUCLEAR POWER BUSINESS UNIT OI17 OPERATING INSTRUCTIONS MINOR Revision 10 a LETDOWN GAS STRIPPER OPERATION January 25.1997 5.3.2 Complete shutdown

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a. Align VCT H gas 2 makeup per OP-5D. Ensure that CV-261C is closed.

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b. Go to close on GS-GW-71 A(B) stripper feed isolation valve and/or have the control operator place the gas stripper divert valve control switch to VCT.
c. Close GS-GW-3A(B) trim cooler outlet level control valve.
  • CAUTION
  • COOLDOWN RATE MUST BE CONTROLLED TO AVOID DRAWING A VACUUM IN THE LETDOWN GAS STRIPPER.
d. Go to manual and close on TICK-GW-1 A preheater temperature controller. Close RS-44(30) and RS-45(31) to secure steam to preheater.

i

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NOTE: GS-GW-17A(B) HX-13SA(B) outlet TCVis to remain open during cooldown to providefor gas stripper gas backfill

e. Place control switch for GS-GW-17A(B) to HAND.

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f. Verify cryo compressor suction is maintained at the normal value to allow backfeed. If necessary, adjust CR-PCV-2.
g. Go to manual and open on PICK-GW-4 gas stripper feed pressure controller.
h. Leave PICK-GW-5 condenser pressure controller, and TICK-GW-9 trim cooler temperature controller in auto,
i. Stop P-130A(B) circulating pump.
j. Shut IGS-39(2GS-39), water return from cryo system moisture separator HX-138A(B).

5.4 Crvo Chiller System Ooeratine Procedure 5.4.1 Chiller system startup

a. Chiller system lined up per applicable section CL-93.
b. Verify that the temperature indication controller on the F-Il refrigeration units is set at 80"F.

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NUCLEAR POWER BUSINESS UNIT 0117 OPERATING INSTRUCTIONS MINOR Revision 10 LETDOWN GAS STRIPPER OPERATION January 25.1997

c. Verify chiller / surge tank T-109 is >3/4 full of water.
d. Start P-143, T-109 recirculation pump (local switch on wall).
e. Verify that power to the F-11 refrigeration units HX-152A&B is available and tumed on. Power supply is breakers 34 & 36 on the auxiliary systems heat tracing panel across from 2B32.
f. Position the two-way suction and discharge valves CR-103 and 104 for operating the desired chiller pump (P-139A or B). (Note valve operating handle points to the pump selected.)
g. Start the selected chiller pump. Control switch is located at the cryogenic electrical control panel.
h. Check chiller pump P-139A or B discharge pressure is between 15 to 30 psig.
i. Readjust temperature indication controller on F-11 refrigeration unit to 36*F. Observe that both F-11 units start. Observe that bubbles in the bulls-eye approach an intermittent rate after several minutes of operation.

If a solid stream of bubbles persists the unit charge may be lost.

j. Allow the chiller unit to cool down for two hours. Check supply and return differential temperature is less than 10 F. If the F-11 refrigeration units have not staned to cycle, they may need to be recharged.

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k. When the chiller system has reached equilibrium condition, refill surge tank to >3/4 full. Inspect all piping for leaks.
1. Stop P-143 surge tank recirculating pump.

5.4.2 Shutdown

a. Stop chiller pump P-139A or B. Put control switches in pullout.
b. Reset temperature indication controller to greater than room ambient i

condition (greater than 80 F) and observe the F-11 chillers stop cycling. i 5.5 Startine a Crvonenic Comoressor 5.5.1 Prior to staning, check sump oil level, component cooling cut in, and diaphragm failure pressun indicator reading 0 psig. -

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.,, NUCLEAR POWER BUSINESS UNIT 01 17 l OPERATING INSTRUCTIONS MINOR l Revision 10 l LETDOWN GAS STRIPPER OPERATION January 25,1997 m ,.

5.5.2 Start K-10A (K-108) and adjust as necessary CR-2-PCV to maintain suction pressure at 1.0 psig as indicated on suction pressure gauge PI-l A (PI-lB).

5.5.3 After five minutes' operation, check that the bulls-eye on the attached lube oil reliefis partially full, with oil being injected on each stroke of the compressor.

Check that the diaphragm failure presi,ure indicator is O psig. If a small pressure (0 to 12 psig) is indicated, vent off through CR-99 (CR-100) to the atmosphere and recheck after 10 minutes' operation. Note if this pressure buildup persists the diaphragm has failed, secure the compressor.

5.6 Response to and recovery from a radwaste CCW isolation and auto shutdown of the ,

letdown gas strippers and cryogenic gas compressors. FOR BLOWDOWN EVAP RECOVERY. RFfERENCE 01-16.

5.6.1 When either LW-63 and/or LW-64 leave the full open position, the following equipment will trip or close.

K-10A Cryogenic Gas Compressor Trip Off K-10B Cryogenic Gas Compressor Trip Off P-130A Letdown Gas Stripper Circ Pump Trip Off P-130B Letdown Gas Stripper Cire Pump Trip Off P-137 Aux Condensate Return Pump Trip Off RS-SA-1 Radwaste Steam Supply Control Valve Trip Close t

if the keyswitch "radwaste CCW isolation bypass for RS-SA-1" is used, then prior to opening RS-SA-1, steam should be secured to the letdown gas strippers by shutting RS-28.

5.6.2 If a radwaste CCW isolation occurs, perform the following for the letdown gas strippers and cryogenic compressors:

Place:

TICK-GW-1A Gas Stripper Prehtr Temp Control Manual & Shut TICK-GW-1B Gas Stripper Prehtr Temp Control Manual & Shut PRCK-GW-4A Gas Stripper Feed Pressure Control Manual & Shut PRCK-GW-4B Gas Stripper Feed Pressure Control Manual & Shut 1

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' ' ' NUCLEAR POWER BUSINESS UNIT OI17 OPERATING INSTRUCTIONS MINOR

! Revision 10 LETDOWN GAS STRIPPER OPERATION January 25.1997

  • CAUTION
  • IF A CONTAINMENT ISOLATION WAS THE CAUSE OF CLOSURE OF LW-63 AND LW-64, THEN CONTAINMENT ISOLATION WILL HAVE TO BE RESET AND DSS PERMISSION IS REQUIRED TO RE-OPEN LW-63 AND LW-64.

5.6.3 To recover from radwaste CCW isolation and establish normal operation:

a. Open LW-63 and LW-64 on 2C03
b. Place RS-SA-1 in manual and SHUT.
c. Depress the radwaste component cooling isolation reset pushbunon on C-180.
d. Check that the radwaste component cooling isolation alarm at C-180 is clear,
e. Start K-10A or B per Section 5.5 of this procedure.
f. Verify the following controllers in manual and shut:

TICK-GW-1 A Gas Stripper Prehtr Temp. Control Manual & Shut TICK-GW-1B Gas Stripper Prehtr Temp. Control Manual & Shut' PRCK-GW-4A Gas Stripper Feed Pressure Control Manual & Shut PRCK-GW-4B Gas Stripper Feed Pressure Control Manual & Shut

g. Start P-130A and crack open TICK-GW-4A to ~5 percent open and observe pressure in the letdown gas stripper. Adjust TICK-GW-4A to obtain normal feed pressure while observing stripper pressure.
h. Start P-130B and crack open TICK-GW-4B to ~5 percent open and observe pressure in the letdown gas stripper. Adjust TICK-GW-4B to obtain normal feed pressure while observing stripper pressure.

'~

i. Reference 01-16 for blewdown evaporator startup/ lineup prior to opening RS-SA-1.
j. Manually throttle open RS-SA-1 and establish ~50 psig radwaste steam pressure.
k. If desired, place the letdown gas strippers in operation in accordance with Steps 5.1 and 5.2 of this procedure. "

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NUCLEAR POWER BUSINESS UNIT OI17 OPERATING INSTRUCTIONS MINOR Revision 10 LETDOWN GAS STRIPPER OPERATION January 25.1997 INITIALS 5.7 Gas Strinoer System Gas Leak Check

  • CAUTION
  • THIS SYSTEM CONTAINF RADIOACTIVE GASES AND LIQUIDS. THE AREAS BEING ENTERED MAY BE HIGH RADIATION AREAS.

APPROPRIATE HEALTH PHYSICS PRACTICES MUST BE OBSERVED AND AN RWP IS REQUIRED.

NOTE: This procedure leak checks both gas strippers.

5.7.1 Place both letdown gas strippers in a hot standby condition per Step 5.3.1 and allow stripper conditions to stabilize.

NOTE: Ifprimary system conditionspermit, wait an additional 8-16 hours beforeproceeding to allow decay ofthe short-lived isotopes.

5.7.2 Align gas stripper building ventilation exhaust through a purge

' )

exhaust charcoal filter unit per the guidelines of AOP-11B.

5.7.3 Setup of helium test equipment:

a. Obtain an RWP.
b. Locate the helium detector system on El. 6.5' of the facade outside the gas stripper entrance door.

I

c. Route sufficient tubing inside the gas stripper building, through a hole above the main entrance door, to reach the upper elevation piping and valves.
d. Route roughing pump return to the gas stripper building via tubing through the hole above the entrance door. __

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NUCLEAR POWER BUSINESS UNIT 0117 OPERATING INSTRUCTIONS MINOR Revision 10

.- LETDOWN GAS STRIPPER OPERATION January 25.1997 t ..,

INITIALS

e. Danger tag shut 2WG-1657A, N2supply to the gas strippers.
f. Verify 1&2GS-61 locked shut, local N2 purge isolation valve.  ;
g. Attach a helium bottle with regulato'r_to the tubing downstream of N2 regulator PCV-61, in Pipeway 4. i 5.7.4 Start up and calibrate the helium detector:

1 NOTE: Reference 01-85 and the leak detector manualfor the proper operation ofthe helium detector system.

NOTE: The position of the needle valve should not be  ;

altered during calibration and testing.

a. Tune the detector for peak response and for zero

, calibration.

b. Connect a 2 percent helium test cylinder to the detector '

system and plot the corresponding count rate on Figure 1.

c. Extend a straight line from zero through the above point as the expected detector response for various helium concentrations.

4 5.7.5 Helium addition to the gas stripper:

l a. Secure the Cryo compressors and danger tag the control switch in pullout.

K-10A in Pullout  ;

, K-10B in Pullout l

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~ NUCLEAR POWER BUSINESS UNIT 0117 OPERATING INSTRUCTIONS ,

MINOR Revision 10

.- LETDOWN GAS STRIPPER OPERATION January 25.1997

,,.. INITIALS l b. Shut and danger tag the following valves:

CR-17 Compressor Gas Makeup Isolation CR-4 K-10A Suction Isolation t CR-5 K-10B Suction Isolation IGS-39 Water Separator Return Isolation 2GS-39 Water Separator Return Isolation CR-39 Cryo System Outlet CR-40 Cyro Outlet to VCT 4 CR-41 Cryo Outlet to VCT

  • CAUTION
  • HELIUM ADDITION MUST BE PERFORMED IN A SLOW AND 1

CONTROLLED MANNER TO PREVENT GAS BINDING IN THE STRIPPER CONDENSER OR ERRATIC OPERATION OF THE CONDENSER PRESSURE CONTROLLERS, PICK-GW-5A(B).

SECURE HELIUM ADDITION IMMEDIATELY IF GAS STRIPPER PRESSURE IS >4.0 PSIG AND PCV-GW-5A(B) IS WIDE OPEN OR ,

AUTOMATIC RADWASTE STEAM I ISOLATION WILL OCCUR VIA THE  :

TRIPPING SHUT OF RS-SA-1 WHEN l STRIPPER PRESSURE IS >20 PSIG.

. NOTE: At normal operating level, each gas stripper vapor volumeis250cubicfeet. A T-sizeheliumcylinder contains 10.8 cuft ofgas per 100 psi drop in cylinderpressure.

c. Add equal amounts of helium to each gas stripper via 1&2GS-61 local N2 Purge isolation valve for a 2 percent 4

helium concentration.

, d. Lock shut 1&2GS-61 I i

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NUCLEAR POWER BUSINESS UNIT OI17 OPERATING INSTRUCTIONS MINOR Revision 10 LETDOWN GAS STRIPPER OPERATION January 25.1997 i '

INITIALS

e. Request Chemistry to obtain a sample volume of stripper gas at 1 or 2GS-20 local sample valve.
f. Attach the gas sample to the leak detector and record:

Count rate He concentration  %

5.7.6 Align the helium detector for leak detection per Figure 2.

5.7.7 Establish radio communication between the detector operator and the person at the sniffer tube in the gas stripper building.

  • CAUTION
  • THE PERSON IN THE GAS STRIPPER BUILDING IS UNDER THE CONTROL OF THE DSS AND MUST EXIT PROMPTLY WHEN NOTIFIED BY CONTROL ROOM PERSONNEL OF DETERIORATING RADIOLOGICAL CONDITIONS IN THE STRIPPER BUILDING.

5.7.8 Using the detector tubing, sniff all vapor space mechanical joints for leaks. Include all valves, valve bonnets, valve packing on stems, pipe caps or plugs, relief valves, flanged joints and mechanical connectors.

5.7.9 Record sampling flow, background counts and the indicated counts for any leaks found in Section 6.0, Leak Quantification, data sheet attached.

5.7.10 Shut GS-GW-17A(B) HX-135A(B) vent cooler outlet TCV and recheck the valve stem seal for leaks.

l 5.7.11 Repeat Step 5.7.10 with the valve open.

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' NUCLEAR POWER BUSINESS UNIT 0117 OPERATING INSTRUCTIONS MINOR Revision 10 t LETDOWN GAS STRIPPER OPERATION January 25.1997

, . , , . . INITIALS 5.7.12 Restore the system for operation:

a. Disconnect and remove the helium bottle from the N2 purge' line in Pipeway 4. Reconnect the normal N2 purge tubing at PCV-61.

PMT

b. Snoop all disturbed fittings to determine leak tightness.
c. Remove the leak detection system supply and return tubing from the stripper building.
d. Open the following valves:

CR-4 K-10A Suction Isolation CR-5 K-10B Suction isolation ,

CR-17 Compressor Gas Makeup Isolation i

l EMI

e. Start one cryo compressor and observe that the gas strippers and cryo system return to normal operating pressure.

l f. Restore the balance of the valves on the danger tag series to a normal operating lineup.

g. Restore the stripper building ventilation system to normal.

5.7.13 Return the gas strippers to operation per the direction of the DSS.

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- ' NUCLEAR POWER BUSINESS UNIT 0117 OPERATING INSTRUCTIONS MINOR l Revision 10 ,

c' LETDOWN GAS STRIPPER OPERATION January 25.1997  :

INITIALS  !

I 6.0 LEAK OUANTIFICATION .

Leaks found can be quantified by using the following relationship.

i L = F (1-B)/S ,

! L = Leak size, seem F = Sample flow, seem B = Natural background helium, ppm S = System helium, ppm I = Indication helium, ppm I = (natural backgrcund, ppm) (indication, counts)/(Natural j

background, counts) 6.1 Ouantify Leakage i

Leak Natural Background Indication System Flow Leak Size Location ppm Counts Concentration (sccm) (sccm) MWR No.

ppm Counts (ppm) 5.24 l

5.24  ;

a. -

5.24 .

5.24 5.24 5.24 I l

5.24 j 6.2 Hang maintenance request identification tags at each leak location.

1 i

Evaluation Performed by Date Remarks:

t

)

4 1

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1 NUCLEAR POWER BUSINESS UNIT OI17

i OPERATING INSTRUCTIONS MINOR '

Revision 10 LETDOWN GAS STRIPPER OPERATION

. January 25.1997

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, , REFERENCE USE 8 #

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. LETDOWN GAS STRIPPER OPERATION January 25.1997

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