ML20204H697

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Rev 0 to Procedure RDW 3.9, Procedure to Decontaminate Oil
ML20204H697
Person / Time
Site: Point Beach  NextEra Energy icon.png
Issue date: 01/11/1984
From:
WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML20204H448 List:
References
RDW-3.9, NUDOCS 8411120354
Download: ML20204H697 (6)


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RDW 3.9 MINOR Revision 0 01-11-84 PROCEDURE TO DECONTAMINATE OIL 1.0 GENERAL This procedure describes a method to decontaminate oil via micron filters with the dual filter system.

Contaminated oil is run through micron filters via a pump to remove insoluable radioactive contamination. The oil is then sampled and an isotopic analysis is performed to determine if it can be released as nonradioactive material.

2.0 DEFINITION 2.1 Waste 031 Drum Drums in which waste oil is stored before the oil is filtered in accordance with this procedure or absorbed in accordance with RDW 3.3.

These drums are normally identified with a "NR ..." number. These drums are not used for shipping.

2.2 Intermediate Drum Drum into which oil will be pumped on the first pass through the filters. This drum may be reused.

2.3 Final Drum Drum into which oil will be pumped to from the intermediate drum.

2.4 Micron Filters

' Filter inserts used in filtration unit usually of the 5 micron size for the first pass and a 1 micron size for the final second pass.

2.5 Portable Filter System l Consists of suction and discharge hoses, dual filter housings, pump and motor and various 90' ball isolation valves.

3.0 REFERENCES

Technical Manual "Model 120 Portable Filter Transfer System" (Howard Corporation)

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RDW 3.9 Page 2 4.0 REQUIRED MATERIAL 4.1 Two new 55-gallon drums.

4.2 Blotting paper or herculite; a sufficient amount to cover an area that will include pump and filter, contaminated waste oil drum and intermediate drum.

4.3 Filter unit and associated hoses.

4.4 Portable hand pump and bucket.

4.5 Micron filters (normally 1 & 5 micron) 5.0 PRECAUTIONS 5.1 Wipe up all oil spills as they occur.

5.2 Handle oil carefully as a radioactively contaminated liquid.

5.3 Handle expanded filters carefully as high levels of contamination may exist.

6.0 CHANGING FILTERS 6.1 Using tiered housing (normally 1 micron filters).

6.1.1 Place a container below the filter casing lower drain valve.

6.1.2 Remove the plug and open the lower drain valve.

6.1.3 Open the upper vent valve.

NOTE: THE CASING MAY HOLD UP TO 6 GALLONS OF LIQUID.

6.1.4 When the casing has drained, close both valves and replace the plug.

6.1.5 Remove the filter housing cover.

6.1.6 Unscrew and remove the spring loaded T handle.

6.1.7 Lift out the tiered filter housing from the filter casing.

Measure the dose rate of filters. Place the unit on a blotting paper work area.

6.1.8 While holding the knurled knob at the bottom of the tiered I filter housing, unscrew the T handle at the top of the tiered l housing.

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6.1.9 Disassemble the filter tiers.

6.1.10 Remove spent filters if installed.

NOTE: HIGH LEVELS OF CONTAMINATION MAY EXIST ON FILTERS, THEREFORE, HANDLE CAREFULLY.

6.1.11 Inspect the knife edge inside each filter tier. If the edges are damaged, do not reassemble the unit. Report any damage to the NPS or engineer assigned to radwaste.

6.1.12 Remove the black filter core from the spent filter and install it in new filter.

6.1.13 Install the new filter back in the tier.

6.1.14 Repeat Steps 6.1.10 to 6.1.13 for the next 3 filter tiers.

6.1.15 Reassemble the filter tiers and replace the unit back in housing.

6.1.16 Lahti the filter housing according to the filter size installed along with the date installed.

6.2 Using non-tiered filter unit (5 micron filter) 6.2.1 Perform Steps 6.1.1 to 6.1.6 above.

6.2.2 Lift the filter assembly waste receptical. Remove the gasket on the bottom of stand pipe.

NOTE: USE PRECAUTION WHEN REMOVING THE GASKET SINCE IT IS 24" DOWN INSIDE THE FILTER CASING AND THE

, CASING INTERIOR MAY BE CONTAMINATED.

i 6.2.3 Insert the new gasket. ,

l l 6.2.4 Reassemble the filter casing.

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6.2.5 Label the filter housing according to filter size installed along with the date installed.

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l 7.0 GENERAL OPERATION (See Attachment 1 for diagram) 011 suction is taken from the oil barrel through the suction hose into "Y" strainer to the suction side of the pump. The bypass valve on the discharge of the pump is left open until the pump is primed with oil. Once oil is flowing _through the pump, the inlet valve to one of the filters is opened and the bypass is closed.

Pressure ai. the discharge of the pump is indicated on a pressure gauge.

Pressure in excess of 70 psi will shut down the pump. This, along with reduced flow from the discharge hose, is an indication that the filter requires changing.

A low level shut down at 20 psi protects the pump from running dry. This shut down is overridden on start up by holding down the start button until

, the pump developes a pressure of 25 psi.

8.0 WATER CHECK IN WASTE OIL DRUMS Each drtua of oil must be checked for the presence of water which may have settled below the oil at the bottom of the drum.

8.1 Let the drum set for at least one hour after it has been n.oved. This will allow the drum contents to settle.

8.2 Flace the probe of the portable oil transfer pump into the very bottom of the drum.

8.3 Pump any water that may have accumulated in the bottom of the drum .

into a bucket.

8.4 Cease pumping when oil comes out of the pump.

8.5 Allow the oil-water. mixture in the bucket to separate.

8.6 Pour the oil off of the top and back into the waste oil drum. The water should be solidified according to RDW 3.2 or OP-9B.

9.0 SYSTEM OPERATING PROCEDURE 9.1 Connect the inlet and outlet hose to the filter system.

9.2 Shut the inlet valves to both filters and open the filter bypass valve.

, 9.3 Place both the inlet and outlet hoses into the barrel that is to be

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9.4 Start the pump. When oil flows from the discharge hose, release the start button to stop the pump.

9.5 Place discharge hose in intermediate barrel. Shut the bypass valve.

Open the inlet valve to first filter to be used (normally the 5 micron filter).

9.6 Start the pump. When pressure exceeds 25 psi, release button and the pump should continue to run.

NOTE: THE FILTER UNIT MAY REQUIRE VENTING ON UNIT STARTUP. CONTACT THE NPS OR ENGINEER ASSIGNED TO RADWASTE FOR INSTRUCTIONS.

9.7- Secure the pump when the barrel is empty.

9.8 Sample the oil in the intermediate barrel in accordance with Section 10 below.

9.9- Shut the isolation valve to the first filter and open the valve to the second filter (normally a 1 micron filter). Place the discharge hose into the final waste oil drum and pump the oil into the drum.

9.10 Sample the drum in accordance with Section 10 below.

9.11 Disassemble and clean the two hoses.

- 10.0 SAMPLING PROCEDURE 10.1 Put both the suction and discherge hoses into the barrel to be sampled.

NOTE: SUCTION HOSE MUST BE ON THE BOTTOM AND DISCHARGE HOSE ABOUT 1/3 DOWN TO PREVENT SHORT CIRCUITING.

I 10.2 Start the pump. Throttle the bypa'ss valve to achieve a pressure of 40 1 psi at the discharge of the pump.* Check shut the isolation valves to both filters.

10.3 Recirculate the oil for about 5 minutes.

10.4 Fill a 1 liter bottle with the oil.

10.5 Secure the pump.

i 10.6 Mark the bottle with the date, time and sample number. Smear the bottle to determine if any removable surface contamination exists.

.. 10.7 Deliver sample bottle to chemistry for analysis.

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i 10.8 The oil may be mixed using a mixing blade before sampling.

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