ML20138K381

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Rev 6 to IO 22C, Changing Spent Fuel Pool Filter (F6)
ML20138K381
Person / Time
Site: Point Beach  NextEra Energy icon.png
Issue date: 01/30/1997
From:
WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML20138K159 List: ... further results
References
OI-22C, NUDOCS 9702180216
Download: ML20138K381 (4)


Text

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NUCLEAR POWER BUSINESS UNIT O! 22C OPERATING INSTRUCTIONS MINOR Revision 6 l CHANGING SPENT FUEL POOL FILTER (F6) January 30.1997 (3

kl Unit RECORD Date PROCENRE VERIMED CN ANNOR MRARY CHANGE 5 IF FIELD COPIES REQL' IRED. USE PBF4026:!AW NP l 2 4 AM) DO NDI COMPLETE TilI5 BLOCK DSS llY: DATE:

1.0 PURPOSli l To provide detailed instructions for changing the spent fuel pool filter (F6).

2.0 REFERENCES

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

3.0 PRECAUTIONS AND LIMITATIONS 3.1 A radiation work permit and continuous Health Physics coverage is required while changing filters as the filters are highly radioactive.

3.2 Ensure each spent filter tube's inlet and end cap is removed from the filter vessel before installing new filter tubes.

3.3 Ensure the small lead filter removal cask is in a plastic bag with blotting paper prior to transporting cask to prevent spread of contamination.

34 The small lead filter removal cask holds only three filter tubes.

35 As much work as possible should be performed remotely through the filter access / shield plug opening, to minimize radiation exposure.

3.6 Depending on expected radiation expost.re, some steps that involve remotely operated tools may be eliminated in favor of direct operation (pending HP approval).

3.7 Review the precautions and limitations of 01-22.

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'D 9702180216 970210 PDR ADOCK 05000301 Page1of4 REFERENCE USE P

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NUCLEAR POWER BUSINESS UNIT 0122C OPERATING INSTRUCTIONS MINOR Revision 6 l CHANGING SPENT FUEL POOL FILTER (F6) January 30,1997 ,

INITIALS 4.0 INITIAL CONDITIONS In addition to the conditions of Section 4.0 of 01-22, ensure the following 4.1 The following tools are available:

1 - 1/2" drive long-extension and long-handled ratchet 1 - 15/16" socket 1 - Special valve operating tool 1 - 1" slotted socket 1 100 fl-lb torque wrench 1 - Filter tube lifling tool 4.2 A step-off pad at the filter cubicle entrance has been established.

5.0 PROCEDURE 5.1 Open the vessel drain valve three (3) turns using the small extension wrench and the special valve opening attachment.

52 Open the vessel vent valve three (3) turns using the small extension wrench and the special valve opening attachment. Allow vessel to drain for approximately 15 minutes.

5.3 Loosen twelve (12) turns but do not remove the vessel closure bolts using the small extension wrench with 15/16" socket attached.

5.4 Using the small extension wrench with special handwheel rotating attachment, turn the cover handwheel clockwise until handwheel stops turning and cover assembly swings aside.

5.5 Using the small extension wrench with special 1" slotted socket attached, loosen the "T" bolts which retain the separator plate. Swing the "T" bolts aside.

5.6 Remove the separator plate by using the special lifting tool. Set the plate on the floor on blotting paper next to the vessel.

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NUCLEAR POWER BUSINESS UNIT OI 22C OPERATING INSTRUCTIONS MINOR Revision 6 l CHANGING SPENT FUEL POOL FILTER (F6) January 30.1997

, INITIALS 5.7 Place the steel supports across the shield plug opening and place the small lead cask on the supports in line over the filter vessel.

  • CA UTION* VERIFY OPERATOR IS SURE OF WHICH LINE HOLDS THE FILTER AND WHICH LINE RELEASES THE FILTER.

NOTE: CHECK EA CH FILTER FOR ITS TOP AND BOTTOM END CAPS.

5.8 Attach the filter tube lifting tool to the small cask and lower the tool down to pick up a filter tube.

59 Seat the tool on top of a filter with the release line.

5.10 Pull the hold line which will grip the filter and gently raise the filter into the small cask.

5.11 Rotate the indexing mechanism in the cask 90 l (UD 5.12 Release the filter by pulling the release line and slacking the hold line.

5.13 Repeat 5.8 to 5.12 to remove all remaining filter tubes.

5 14 When the small lead filter cask is full, (3 filter tubes) place it in a plastic bag with blotting paper and transport it for emptying per the radwaste supervisor.

5.15 Support small cask over disposal site, remove plastic bag and rotate indexing mechanism to allow filters to fall out of small cask. 4 5.16 Repeat 5.14 and 515 as necessary until all filter tubes have been removed from the filter vessel.

5.17 Flush filter vessel with demineralized water to rensve all din left behind.

5.18 Inspect filter vessel for damage and ensure that a;l metal end caps from previous filter tubes have been reinoved.

5 19 Wet 0-rings of new filter tubes with DI water and install filter tubes with

( O-ring end up.

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NUCLEAR POWER BUSINESS UNIT 0122C OPERATING INSTRUCTIONS MINOR i Revision 6 l_ CHANGING SPENT FUEL POOL FILTER (F6) January 30.1997 5.20 Install new O ring in separator plate and position plate over filter tubes pushing down to seat plate onto filter tubes 5.21 Swing four (4) T-bolts into position and tighten evenly.

  • CA UTION* CARE NEEDS TO DE TAKEN TO NOT DETACil llANDWIIEEL FROM LEAD SCREW.

5,22 Swing filter vessel cover into position. Turn handwheel counterclockwise until cover is seated.

l NOTE: QCInspector snust witness perfonnance ofStep 5.23.

5 23 Clean and lubricate cover closure bolts. Tighten the flange bolts in diagonal sequence, torquing each bolt to a finalload of 75 fl-lbs l Torque Wrench Id. No. Calibration Date l 5.24 Filter vessel flange bolts have been torqued to 75 fl-Ibs.

l 5 25 QC Close the drain valve and obtain permission to remove danger tags 5.26 Fill and vent filter vessel l PMT 5 27 Apply system pressure to filter vessel and check for leaks 5.28 Cut in filter and shut bypass.

5.29 Install the shield plug and clean the area and all tools.

5.30 Return all tools to their proper storage.

5 31 llave HP perform a final contamination survey.

5 32 Record test equipment ID's on the CHAMPS Task sheet.

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