ML20138K400

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Rev 3 to OI 22F, Changing Boric Acid Filters (F3)
ML20138K400
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-22F, NUDOCS 9702180248
Download: ML20138K400 (4)


Text

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NUCLEAR POWER BUSINESS UNIT OI 22F OPERATING INSTRUCTIONS MINOR ,

Revision 3 l CifANGING BORIC ACID FILTERS (F3) January 30,1997

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Unit RECORD DatC PROCEDURE STR!FIED CURRENT AND CHECKED FOR TEMPORARY Cil\NGES IF F!E1.D DSS BY: DATE:

l 1.0 PURPOSE To provide detailed instructions for changing the boric acid filters (F3)

2.0 REFERENCES

IR 96-906, NRC Inspection Report, NRC Commitment for Operations procedure PMT/QC reviews. ,

30 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.

, p, 3.2 Ensure each spent filter tube's inlet and end cap is removed from the filter vessel before Q 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 smalllead 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 The filter vessel vent and drain could well be plugged. This procedure has been written to open the vessel in a full but depressurized condition. This procedure assumes that the radiation exposure does not warrant an extensive cleaning operation of the vent and drain piping.

INITIALS 4.0 INITIAL CONDITIONS In addition to the conditions of Section 4.0 of 01-22, ensure the following are met:

4.1 A one-halfinch drive reversible impact wrench is available to remove the filter vessel cover bolts (15/16" socket).

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4.2 Position the large filter cask at the filter area entrance using the manually-operated cask cart.

9702180248 970210 '

PDR ADOCK 050003014 Page1 of4 REFERENCE USE P

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0122F NUCLEAR POWER BUSINESS UNIT OPERATING INSTRUCTIONS MINOR Revision 3 January 30,1997 CilANGING BORIC ACID FILTERS (F3)

INITIALS O

4.3 Approximately fifteen feet of one-halfinch diameter rope, knotted for grip, is available to lift the filter retention assembly from the vessel (approximately 75 pounds) The easiest hookup and straightest pull can be made using the lifting rope attached to the center of a two-foot piece of rope which has hooks attached to each end, 44 Establish step-of f pads well away from the filters at the filter area entrance.

45 Use large plastic bags to double bag the large filter cask interior.

46 Rig a DI water hose to the filter area 47 A 0-100 fl/lb torque wrench is available.

48 Arrangements have been made with an insulation contractor for filter vessel insulation removal (MTN) 50 PROGDERE 51 Bypass, then isolate the selected filter.

52 Monitor the filter vessel pressure on Pl.109, filter outlet pressure and observe a pressure decrease due to cooling as work proceeds 53 Depending on the circuit connections, disconnect or have electricians disconnect the heat tracing circuits invoked in removing the vessel cover 54 Contact the insulation contractor for removal of the vessel insulation Covers 55 Lay several thicknesses of blotting paper on a plastic backing beside the filter vessel to receive the filter assembly.

5.6 Observe that the filter vessel pressure has decreased by comparing inlet and outlet pressures 5.7 Operate a boric acid transfer pump and verify no pressure increase in the filter vessel.

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NUCLEAR POWER BUSINESS UNIT 0122F OPERATING INSTRUCTIONS MINOR Revision 3 CHANGING BORIC ACID FILTERS (F3) January 30.1997

/3 INITIALS U

5.8 Dress in full plastic protective clothing and remove the vessel-cover closure bolts.

5.9 Turn the vessel-cover handwheel clockwise to raise and swing the cover aside.

5.10 Using a man above the filter, lift the filter retention assembly and lay it on its side on the blotting paper.

5 11 Remove the individual filter elements from the assembly by sliding the spring cap end of the element ofTthe retention plate.

5.12 Retain the spring caps and V-shaped stiffeners, bag the filters and place in the filters cask.

5 13 Move the fi;ter retention assembly to the floor drain and hose down.  !

5 14 Inspect gaskets and seal surfaces. _

5.15 Replace the gaskets or gasket retention clips as required. Leave the gasket surfaces dry.

5.16 Install the new filter elements in the filter retention assembly using a putty knife to " shoehorn" the end cap springs onto the bottom plate.

5 17 Clean the filter vessel seal;ng flanges and bolt holes 5.18 Hoist the filter assembly into the vessel and replace the vessel cover.

l 5.19 Clean and lubricate the vessel cover bolts. I l NOTE: QC Inspector must witness performance ofStep 5.20.

5.20 Torque the vessel cover bolts to 75 fl/lbs using a diagonal sequence and 25 i ft/lb increments.

l l Torque Wrench Id. No. Calibration Date 5.21 Filter vessel cover bolts are properly torqued, QC

[] PMT C/ 5.22 Crack open the filter inlet valve and start a boric acid transfer pump to ,

check for leaks. l 1

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NUCLEAR POWER BUSINESS UNIT 0122F OPERATING INSTRUCTIONS MINOR Revision 3 CIIANGING BORIC ACID FILTERS (F3) January 30.1997 INITIALS 5.23 Return the filter lineup to normal and continue recirculation for ten minutes to remove air trapped in the filter vessel.

5.24 Transport the used filters for disposal as directed by the radwaste supersisor.

5 25 Wash down the boric acid splash area 5.26 Contact the insulation contractor to reinstall the vessel insulation 5 27 Reconnect the heat tracing circuits 5 28 Decontaminate the area as required 5 29 Record the test equipment ID's on the CilAMPS Task Sheet O

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