ML20138K358
| ML20138K358 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 01/25/1997 |
| From: | WISCONSIN ELECTRIC POWER CO. |
| To: | |
| Shared Package | |
| ML20138K159 | List:
|
| References | |
| OI-17B, NUDOCS 9702180179 | |
| Download: ML20138K358 (18) | |
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,' NUCLEAR POWER BUSINESS UNIT OI17B OPERATING INSTRUCTIONS MINOR Revision 2 LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997
,O MAINTENANCE AND RECOVERY UNIT 2 RECORD PROCEDURE VERIFIED CURRENT AND CifLCKED FOR TEMPORARY CHANGES IF FIELD COP!ES REQUIRED, USE PDF 0026 1AW NP L2 4 AND DO tLOJ COMPLETE THIS BLOCA BY: DATE:
1.0 ElJRPOSE To drain and purge the letdown gas stripper in preparation for maintenance and recover the gas stripper for return to service.
2.0 REFERENCES
IR 96-006, NRC Inspection Report, NRC Commitment for Operations y cedure PMT/QC reviews.
3.0 PRECAUTIONS AND LIMITATIONS 3.1 Do not open the 2P-130B Cire Pump breaker until after this procedure directs closing GS-GW-17B, otherwise GS-GW-17B will close because of the cire pump thermal overload interlock.
3.2 During the performance of this procedure, the Unit I letdown gas stripper will be in hot standby for approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> while preparing the Unit 2 gas stripper for maintenance. This is necessary to allow evacuation of the stripper gas to the cryo system.
3.3 It is preferred, but not required, that the stripper building ventilation remains aligned to the Unit 2 Purge Stack throughout the stripper outage.
3.4 This instniction has been rewritten from RMP-189, " Letdown Gas Stripper Unit 2."
3.5 To allow for flexibility, any steps or sections of this procedure not needed may be marked
' NA by the DSS / DOS. To facilitate additional actions, use a workplan in conjunction with this instruction.
INITIALS 4.0 INITIAL CONDITIONS 4.1 The "B" letdown gas stripper is offline and the circulating pump is secured.
9702180179 970210 Page 1 of18 REFERENCE USE PDR ADOCK 05000301 ,
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,, NUCLEAR POWER BUSINESS UNIT OI17B OPERATING INSTRUCTIONS MINOR Revision 2 LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997
,f. MAINTENANCE AND RECOVERY UNIT 2 INITIALS 4.2 Check with I&C to determine if any periodic instrument calibrations are required during the preparation for maintenance or recovery from maintenance.
4.3 Perform a walkdown of the gas stripper noting any open work orders not scheduled for work and consider for inclusion during this outage.
4.4 Unit 2 is not on forced vent.
4.5 21G-305 Containment Purge Exhaust SPING 22 is operable.
4.6 A portable low volume air sampler is set up on the purge exhaust filter selected for use during the LDGS purge.
Circle filter selected 2F-11A 2F-11B 4.7 Radwaste steam supply is secured to preheater HX-1328.
l 4.8 Gas stripper temperature is <l50* per TE-34 Circ Pump Suction Temperature on TR-GW-30B.
4.9 Gas stripper pressure is stable at 1.15 - 3.15 psi PICK-GW-5B Gas I Stripper B Cond Press Ctir.
I 4.10 Prepare a Danger Tag sheet including those valves in Attachment B.
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,. NUCLEAR POWER BUSINESS UNIT OI17B OPERATING INSTRUCTIONS MINOR Revision 2 LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997
^
MAINTENANCE AND RECOVERY UNIT 2 l
INITIALS j l
5.0 PROCEDURE 5.1 Preparation for Maintenance l 5.L 1 Position and danger tag the following:
POSITION 2GS-GW-73B Control Sw on 2C-04 VCT 2P-130B Control SW on S: ripper Panel Pull-out 2GS-1 Stripper Letdown Supply Shut 2GS-38 Stripper Return Line Isolation Shut 2GS-4 Stripper Feed Cross-connect Shut 2GS-36 Letdown Gas Stripper B Cross-connect Shut 2GS-39 HX-138 A-D Cryo Weter Separators Shut Drain IGS-17, "A" Gas Stripper Cryogenic Bypass Shut 2RM-3200S 2F-11 A/B Purge Exh Air Filter Shut Common Manual Inlet (Blower Discharge)
RS-30 Preheater Steam Inlet Isolation Shut RS-42 Preheater Condensate Outlet Shut
- CAUTION
- ENSURE THAT THE UNIT 1 CRYO GAS RETURNS ARE LINED UP PER 01-17
" LETDOWN GAS STRIPPER OPERATION."
5.1.2 Place the Unit I letdown gas stripper in hot standby per 01-17,
" Letdown Gas Stripper Operation." Stabilize temperature and pressure in hot standby conditions.
~
- CAUTION
- DO NOT CLOSE GS-GW-17A UNTIL CONDITIONS ARE STABLE. MAINTAIN TEMPERATURE IN THE STRIPPER AFTER GS-GW-17A IS SHUT TO AVOID DRAWING THE STRIPPER INTO A VACUUM.
5.1.3 Shut the Unit I letdown gas stripper gas outlet GS-GW-17A.
.F Page 3 of 18 REFERENCE USE
NUCLEAR POWER BUSINESS UNIT 0117B OPERATING INSTRUCTIONS MINOR <
Revision 2 t-LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997 f?.!; MAINTENANCE AND RECOVERY UNIT 2 INITIALS NOTE: Safe access to GS-16 willrequire a ladder. GS-66 is on the feed ring accessplatform.
5.1.4 Install a local level indicator by connecting tygon tubing between 2GS 66 2HX-130B LGS Heat Exchanger Inlet Low Point Drain (1/2" swagelok) and 2GS-16 LGS Hi Point Vent (3/4" male pipe).
i 5.1.5 Fill and purge the gas stripper to the cryo system by completing the following:
- a. Attach a DI water supply to 2GS-67 LDGS "B" Supply Line Low Point Drain in the PAB (El. 26' above Unit 2 facade door).
- b. Adjust CR-2-PCV Min Flow Suction Press Control Valve to maintain 0.5 to 1.0 psi in the Unit 2 gas stripper with GS-GW-17B open.
- c. Valve in the local level indicatot installed in Step 5.1.4 and check for leaks.
- d. If two cryo compressors are available, start the second compressor.
y Page 4 of18 REFERENCE USE
NUCLEAR POWER BUSINESS UNIT 0117B OPERATING INSTRUCTIONS MINOR Revision 2
' January 25,1997 LETDOWN GAS STRIPPER PREPARATION FOR 4
,, , MAINTENANCE AND RECOVERY j UNIT 2 INITIALS NOTE: Do not overfill the stripper into the gas outlet piping orfill at a rate which exceeds the capacity i ofthe cryo compressor (s). Stopfilling ifcryo i
compressor suction pressure exceeds 2.5 psi.
NOTE: The local tygon indicator may indicate level higher than actuallevel due to the delta P across thefeed ring nozzles whenfilling. Slow thefill rate as level nears the top of the condenser section.
I
- CAUTION
- FILLING THE GAS STRIPPER WILL DISPLACE THE GAS TO THE CRYO SYSTEM. CRYO COMPRESSOR DISCHARGE PRESSURE WILL INCREASE TO ABOUT 110 PSI ASSUMING NORMAL START PRESSURE OF 75 PSI. THIS WILL OCCUR BECAUSE THE OPERATING STRIPPERS CR-261C WAS CLOSED IN STEP 5.1.2. IF CRYO PRESSURE I REACHES 150 PSI, THEN STOP l
FILLING AND OPEN ICR-261C TO REDUCE PRESSURE.
1
- e. Slowly fill the gas stripper with DI water to the top of the condenser section as indicated by the tygon level indicator then shut 2GS-67 and disconnect the DI hose.
- f. Adjust CR-2-PCV to maintain cryo compressor suction pressure at 0-0.5 psi to evacuate the remaining gas in the stripper to the cryo system.
- g. Position and danger tag the following:
NOTE: The IA supply to GS-GW-17B is not numbered i
\ and no press reg is provided. Air must be bled offby cracking afitting.
4 Position GS-GW-17B Control SW Close GS-GW-17B-S Instrument Air Supply Fail Air / Shut Page 5 of18 REFERENCE USE J . . . g I
,, NUCLEAR POWER BUSINESS UNIT 0117B ;
OPERATING INSTRUCTIONS MINOR Revision 2 LETDOWN GAS STRIPPER PREPARATION FOR January 25.1997 f' MAINTENANCE AND RECOVERY UNIT 2 INITIALS NOTE: The 2P-130B breaker may be opened at this time ifdesired.
5.1.6 Return the running cryo compressors to the as-found lineup.
5.1.7 Adjust CR-2-PCV to maintain normal suction pressure of 1.5 psi.
5.1.8 Open GS-GW-17A the Unit 1 gas stripper gas outlet valve.
- CAUTION
- IF THE VCT FINE CONTROL REGULATOR PCV-158 IS NOT IN SERVICE, THEN THE t EXCESS GAS INVENTORY IN THE CRYO SYSTEM WILL GO TO THE VCT AND VENTING OF THE VCT MAY BE NEEDED.
REFERENCE THE CAUTION PRIOR TO 5.I.5c.
5.1.9 The Unit I letdown gas stripper may be returned to service per 01-17 (Establis;4ed Feed Section) at this time if so desired.
5.1.10 Complete the following to nitrogen purge the gas stripper to the Unit 2 purge exhaust filters:
NOTE: Safe access to GS-20 will require a ladder. An 8' extension ladder works best.
- a. Tee into the 3/8" SS N2line upstream of 2GS-61. Install a 3/8" Whitey valve, to supply N2for the purge,
- b. Connect a 3/8" P-tubing line to the tee and valve upstream of 2GS-61 NG Purge Supply and route to 2GS-20 Vent Cooler Outlet Sample Point (1/2" male pipe). Leave 2GS-20 shut.
- c. Align the gas stripper building ventilation system to the selected (same as step 4.6) Unit 2 purge exhaust fiher using Attachment A of this instruction.
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1 NUCLEAR POWER BUSINESS UNIT 0117B '
OPERATING INSTRUCTIONS MINOR ,
Revision 2 LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997
, MAINTENANCE AND RECOVERY UNIT 2 INITIALS
- d. Verify 2CV-261B, nitrogen to Unit 2 VCT is shut, then align uitrogen purge to the gas stripper building by opening NG-1657B (El. 26' Unit 2 VCT Viv Gallery) PCV-61 supply and setting PCV-61 (PW No. 4 El. 8') for 3-5 psi.
- e. Start the portable air sampler at the purge exhaust filter.
Enter the time and date on the sample envelope.
- f. Align the vent path to the selected purge exhaust filter by opening one of the following:
2RM-3200U Discharge to 2F-ll A 2RM-3200T Discharge to 2F-11B
- g. Open GS-40 Letdown Gas Stripper A and B vent to Unit 2 Purge Exhaust System (Unit 2 facade El. 66' on fan room wall).
i
- h. Notify HP that purging of the gas stripper will begin.
NOTE: Monitor 2RE-305 during the next step as the gas stripper is purged to the Unit 2 purge exhaust stack via thepurge exhaustfilter. Ifthe high alarm is actuated, stop the vent. Consult the DSS for appropriate actions.
- i. Open 2GS-17, "B" Gas Stripper Cryogenic Bypass. .
- j. Open the unnumbered N2 Whitey supply valve from Step 5.1.10.a.
- k. Open 2GS-20 Vent Cooler Outlet Sample Point to start the purge.
- 1. Purge until 2RE-305 indicates that the rad gas has been displaced.
N. F
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NUCLEAR POWER BUSINESS UNIT 0117B OPERATING INSTRUCTIONS MINOR Revision 2 LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997
. MAINTENANCE AND RECOVERY UNIT 2 INITIALS NOTE: The required levelfor the gas stripper is determined by the scope ofmaintenance being performed during the outage.
5.1.11 Complete the following to drain the gas stripper to the required ;
level, while continuing to vent to the purge exhaust filters and backfill with nitrogen:
NOTE: Since the stripper is still vented to the purge exhaustfilters, it will be at essentially atmospheric pressure. Ifthe U-2 purge exhaustfans are running, it will be at a slight vacuum. In either case, establish a drain rate based on sump pump capacity.
- a. Slowly drain the stripper by opening 2GS-23 Circ Pump Suction Line Drain until condenser section level as indicated by the tygon local level indicator is low and about to go out of sight, then shut 2GS-23.
NOTE: Do not remove the P-tubing, it will be used during recovery.
, b. Shut 2GS-20 Vent Cooler Outlet Sample Point. ,
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- c. Shut the unnumbered N2 valve upstream of NG-61.
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- d. Continue to purge the stripper using the normal purge i connection by opening 2GS-61 Stripper Purge Valve. i NOTE: The tygon levelindicator willremain connected for use during recoveryfrom maintenance. l l
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NUCLEAR POWER BUSINESS UNIT 0117B OPERATING INSTRUCTIONS MINOR Revision 2 LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997
. MAINTENANCE AND RECOVERY UNIT 2 INITIALS NOTE: When the stripper is completely empty, 2RE-305 .
willindicate a temporaryincrease.
r i
- f. Drain the gas stripper completely, if required, by opening 2GS-23 until nitrogen issues from 2GS-23 then shut 2GS-23. Otherwise, drain to the desired level, then shut 2GS-23.
e
- i. Continue the nitrogen purge of the stripper until RE-224 and 2RE-305 indicate that the stripper can be opened to 4
atmosphere. Then proceed to the next step.
5.1. I'- Position and danger tag the following:
Position 2GS-612HX-130B LGS Heat Exchanger NG Shut Purge Inlet Valve 2GS-17, "B" Stripper Cryogenic Bypass Shut 5.1.13 Align the following valves:
Position 2RM-3200U Continuous Vent to 2F-11 A Locked Shut 2RM-3200T Continuous Vent to 2F-11 A Locked Shut GS-40 LDGS A&B Vent to Unit 2 Purge Exhaust System (U2 Facade Wall, El. 66' cast near fanroom door) Locked Shut /
NG-1657B N2 Supply to PCV-61 (U2 VCT ----
valve gallery) Shut 5.1.14 Notify HP to collect the portable air sampler filters at the purge exhaust filters and secure the sampler if required.
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NUCLEAR POWER BUSINESS UNIT OI17B OPERATING INSTRUCTIONS MINOR Revision 2 LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997
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. MAINTENANCE AND RECOVERY UNIT 2 INITIALS NOTE: Ifcomplete draining of the stripper was not required, then the next step is N/A.
5.1.15 Verify the stripper is drained completely, if required, and depressurized by opening the circ pump suction drain 2GS-23, then shut 2GS-23.
5.1.16 If required. the danger tag on the Unit 2 Forced Vent Blower Discharge 2RM-3200S may be cleared at this time.
5.1.17 The stripper building ventilation may be returned to normal per Attachment A if desired. Reference Precautions and Limitations 3.3.
5.1.18 The gas stripper may be released to Maintenance at this time.
The Maintenance personnel should be informed that some low point drains may contain a small amount of residual water that should be drained prior to attempting repair or replacement of a valve diaphragm.
5.2 Recovery from Maintenance 5.2.1 Perform a walkdown of the stripper to verify that it is ready to be filled. Pay particular attention to the following:
- a. All vents and drains closed.
- b. Equipment that was worked is completed and/or ready for fill.
s Page 10 of 18 REFERENCE USE
NUCLEAR POWER BUSINESS UNIT 0117B OPERATING INSTRUCTIONS MINOR Revision 2 LETDOWN GAS STRIPPER PREPARATION FOR January 25.1997
@, MAINTENANCE AND RECOVERY l UNIT 2 ;
INITIALS NOTE: DO NOTremove danger tags except as specifled in this instruction.
5.2.2 Prepare the gas stripper for fill and vent by completing the following:
NOTE: Ifthe ventilation system is still alignedper Attachment A to thepurge exhaustfilters, THEN steps 5.2.2.a - 5.2.2.e may be marked N/A.
- a. Verify that the gas stripper building ventilation system is aligned to the Unit 2 purge exhaust stack per Attachment A.
- b. Direct HP to place a portable air sampler at the purge exhaust filter selected.
- d. Verify 2RM-3200S forced vent blower discharge is danger tagged shut.
1
- e. Align a vent path to the purge filter selected by opening one of the following; N/A other option:
2RM-3200U Discharge to 2F-11 A l 1
- f. Open GS-40 LDGS A&B vent to Unit 2 purge exhaust.
- g. Attach a DI water hose to 2GS-67 "B" Gas Stripper Supply Low Point Vent (El. 26' PAB near Unit 2 facade door).
Page11 of18 REFERENCE USE
NUCLEAR POWER BUSINESS UNIT 0117B OPERATING INSTRUCTIONS MINOR Revision 2 I LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997 l MAINTENANCE AND RECOVERY l UNIT 2 l INITIALS )
i 5.2.3 Fill the stripper to normal level by completing the following:
- a. Start the portable air sampler on the purge exhaust filter. l 1
l
- b. Open 2GS-17 "B" gas stripper cryo bypass (vent). i NOTE: During thefill, periodically monitor the stripper for waterleakage. \
- c. Throttle open 2GS-67 to fill the stripper with DI water.
Monitor pressure in the stripper during the C.'l operation.
Fill the gas stripper to a normal level of about 65 inches then shut 2GS-67.
5.2.4 Align the gas stripper circ pump for operation by completing the following:
Position 2GS-24 Cire Pump Suction Open i 2GS-27 Cire Pump Discharge Open 2GS-69 Cire Pump Mini-recirc Open 2P-130B Cire Pump Breaker Closed l a. Remove the danger tag on the circ pump control switch,
- b. Open FCV-GW-4B in manual to about 50%.
- c. Start 2P-130B and adjust feed pressure to a normal value of I about 40 psi then place FCV-GW-4B to auto. I
- d. Vent 2P-130B seals via GS-73, then run the pump for 10 min.
- e. Place 2P-130B control switch to pull-out.
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l Page 12 of 18 REFERENCE USE 9 0
NUCLEAR POWER BUSINESS UNIT 01178 OPERATING INSTRUCTIONS MINOR Revision 2 ,
- I LETOOWN GAS STRIPPER PREPARATION FOR January 25,1997 MAINTENANCE AND RECOVERY UNIT 2 :
INITIALS .
5.2.5 Complete the following to purge the nitrogen gas from the gas stripper: !
NOTE: Safe access to GS-16 will require a ladder.
i
NOTE: Do not overfill the stripper into the gas outlet piping. -
NOTE: The local tygon level indicator may indicate level higher than actuallevel due to the delta P across ,
thefeed ring not:les whenfilling. Slow thefill rate as level nears the top of the condenser section.
- b. Open 2GS-67 and slowly fill the gas stripper with DI water to the top of the condenser section while venting through 2GS-17, then shut 2GS-67.
- c. Remove the DI hose and install the cap at 2GS-67.
)
l l 5.2.6 Complete the following to purge any oxygen from the stripper !
prior to backfilling with cryo gas. I
- a. Connect the 3/8" P-tubing line that is still connected to 2GS-20 to the unnumbered 3/8" Whitey valve upstream of {
2GS-61 NG Purge Supply. l i
align the nitrogen purge to the stripper building by opening !
NG-1657B (El. 26' Unit 2 VCT valve gallery).
- c. Set the stripper building nitrogen supply regulator PCV-61 (PW No. 4, El. 8') to 3-5 psi.
- d. Open 2GS-20 Vent Cooler Outlet Sample Point.
- e. Open the unnumbered Whitey valve on the nitrogen supply line to begin the purge.
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NUCLEAR POWER BUSINESS UNIT 0117B OPERATING INSTRUCTIONS MINOR Revision 2
- LETDOWN GAS STRIPPER PREPARATION FOR January 25.1997 MAINTENANCE AND RECOVERY UNIT 2 INITIALS
- f. Purge the stripper for 10-15 minutes then lock shut 2GS-20. l l
- g. Shut the following valves:
Unnumbered Whitey valve on nitrogen supply. !
NG-1657B Nitrogen supply to stripper building. ,
- i. Disconnect the P-tubing from the nitrogen supply and remove the "T" and valve installed in Step 5.1.10.b. <
5.2.7 Vent the recovery HX, if required, via 2GS-10 and 2GS-11
[
(these valves are locatedjust below the grating on the upper level). Then shut 2GS-10 and 2GS-II. ,
l EMT !
5.2.8 Inspect the gas stripper for water leakage.
NOTE: Coordinate the next three steps with completing the stripper checklist CL-9E.
5.2.9 Remove the remaining danger tags on the stripper. It may be desirable to maintain the danger tag on GS-.GW-738.
5.2.10 Align the following valves:
Position 2GS-17 Locked Shut i 2RM-3200U Discharge to 2F-11 A Locked Shut 2RM-3200T Discharge to 2F-11B Locked Shut -
GS-40 LDGS A&B Vent to Unit 2 Purge Locked Shut !
2GS-16 Ccndenser Vent Locked Shut Cap at 2GS-16 Installed 2GS-66 Shut .
Pressure Gauge at 2GS-66 Installed 5.2.11 Direct HP to secure the portable air sampler at the purge filter, and collect the 'samples.
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NUCLEAR POWER BUSINESS UhlT 0117B OPERATING INSTRUCTIONS MINOR Revision 2
- ' LETDOWN GAS STRIPPER PREPARATION FOR January 25.1997
. MAINTENANCE AND RECOVERY UNIT 2 INITIALS 5.2.12 The following steps will backfill the gas stripper with cryo gas as the stripper is drained to normal level:
NOTE: The 2P-130B circpump breaker must he closed or GS-GW-17B will not open.
- a. Open GS-GW-17B.
- b. Throttle open GS-23 the cire pump suction drain to drain the gas stripper. Regulate the drain rate to maintain a positive pressure in the stripper,
- c. Continue to drain the stripper until a normal level of abou; 66" is reached, then shut GS-23.
5.2.13 Update the units equipment status board to show that the gas stripper boron is 0.
5.2.14 Restore the gas stripper building ventilation system to normal, per Attachment A step 5.0.
5.2.15 Perform CL-9E, " Letdown Gas Stripper. Unit 2."
5.2.16 Heatup the gas stripper per 01-17, " Letdown Gas Stripper ;
Operation." '
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NUCLEAR POWER BUSINESS UNIT OI17B 1 OPERATING INSTRUCTIONS MINOR l Revision 2 v LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997 MAINTENANCE AND RECOVERY UNIT 2 ATTACHMENT A ALIGNING AND SECURING GAS STRIPPER BUILDING VENTILATION TO THE UNIT 2 PURGE EXHAUST STACK 1.0 PURPOSE To provide instructions to align the gas stripper building ventilation to the Unit 2 purge exhaust stack during gas stripper maintenance and purging.
2.0 PRECAUTIONS AND LIMITATIONS 2.1 IF the Unit 2 containment is aligned for purge supply and exhaust and the purge exhaust fan (s) trip off THEN, immediately restart a purge exhaust fan or terminate the gas stripper purge by shutting GS-40. Otherwise stripper gas may backflow into the containment building. This action is not required after the cryo gas has been purged from the stripper.
2.2 If the U-2 purge system is operating, aligning the gas stripper building may cause a purge exhaust low flow alarm with only one supply and one exhaust fan running.
3.0 INITIAL CONDITIONS None 4.0 ALIGNING THE STRIPPER BUILDING TO UNIT 2 PURGE STACK 4.1 Locally note the position of the selected purge exhaust filter suction damper operator and '
the gas stripper building purge exhaust filter bypass (both located in the El. 66' Fan Room) for comparison in the next steps.
4.2 If not already open, then open the suction damper for the selected purge exhaust filter, F-11 A or B by positioning its local damper control switch to A, open.
1 4.3 Locally verify that the suction damper opened.
4.4 Start the portable air sampler at the filter and record the date and time.
4.5 Open the gas stripper building exhaust discharge damper to the selected filter unit by opening GW-128 (2FW-11 A) or GW-127 (2F-11B) locally at the El. 6.5' facade.
4.6 Verify that the stripper building doors are shut.
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4.7 Shut the gas stripper building purge exhaust filter bypass damper GW-129. Locally verify that the damper shut.
Page 16 of 18 REFERENCE USE
i NUCLEAR POWER BUSINESS UNIT OI 17B OPERATING INSTRUCTIONS MINOR ,
Revision 2 l LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997 q . ., MAINTENANCE AND RECOVERY UNIT 2 Attachment A 5.0 RESTORING STRIPPER BUILDING VENTILATION TO NORMAL 5.1 Locally note the position of the selected purge exhaust filter suction damper operator and the gas stripper building purge exhaust filter bypass (both located in the El. 66' Fan Room) for comparison in the next steps.
5.2 Open the gas stripper building purge exhaust filter bypass damper GW-129. Locally verify that the damper is open.
5.3 Shut the gas stripper building exhaust discharge damper to the selected filter unit by shutting GW-128 (2F-11 A) or GW-127 (2F-11B) locally at the El. 6.5' Facade.
NOTE: Ifon containmentpurge, then the suction damper will not shut in thefollowing step ifthe associatedfan is running.
5.4 Shut the suction damper for the selected purge exhaust filter 2F-11 A or B by positioning its' local damper control switch to the B position.
5.5 If required, secure the portable air sampler at the filter and record the date and time.
Notify HP to collect the samples.
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,. NUCLEAR POWER BUSINESS UNIT 0117B l OPERATING INSTRUCTIONS MINOR Revision 2 i'
LETDOWN GAS STRIPPER PREPARATION FOR January 25,1997 i /,2 ; MAINTENANCE AND RECOVERY UNIT 2 ATTACHMENT B ,
DANGER TAG LIST 4
VALVE POSITION 2GS-GW-73B Control SW on 2C-04 VCT 2P-130B Control SW on Stripper Panel Pull-Out 2GS-1 Gas Stripper Letdown Supply Shut 2GS-38 Stripper Return Line Isolation Shut 2GS-4 Stripper Feed Cross-connect Shut 2GS-36 Letdown Gas Stripper B Cross-connect Shut 2GS-39 HX-138 A-D Cryo Water Separators Drain Shut IGS-17 A Gas Stripper Cryogenic Bypass Shut 2RM-3200S 2F-11 A/B Purge Exh Air Filter Comrnon Inlet Shut RS-30 Preheater Steam Inlet Isolation Shut RS-42 Preheater Condensate Outlet Shut GS-GW-17B Control SW Close GS-GW-17B-S Instrument Air Supply Fail Air / Shut 2GS-612HX-130B LDGS Heat Exchanger NG Purge Inlet Shut .
2GS-17 B Cryogenic Bypass Shut L
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