ML20204H638

From kanterella
Jump to navigation Jump to search
Rev 3 to Procedure RDW 3.6, Preparation of Radwaste Liners for Filling,Storage & Shipment
ML20204H638
Person / Time
Site: Point Beach  NextEra Energy icon.png
Issue date: 05/11/1984
From:
WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML20204H448 List:
References
RDW-3.6, NUDOCS 8411120340
Download: ML20204H638 (5)


Text

. - - . . - -

o a 1 RDW 3.6 MINOR Revision 3 05-11-84 i

l PREPARATION OF RADWASrE LINERS FOR FILLING, STORAGE AND SHIPT 1ENT 1.0 GENERAL .

Disposable type liners can be used for shipping solidified liquid waste, filters and resin. Their preparation and filling is normally accomplished by Operations using procedures outlined in OP-9B and OI-8.

This procedure addresses the health physics requirements in preparing the liner for shipment to a burial site. The liners are normally shipped within shipping casks that are approved packages for Type "A," Type "B" or highway route controlled quantity radioactive materials. Liners must be cc,mpatible with the cask they are shipped in as specified by the particular cask certificate of compliance. The specific shipping package used is determined by the quantity of radioactive material and by transport group being shipped. The ,

liners may also be shipped, depending upon external radiation levels and

the type and quantity of radioactive material it contains, without an external shipping package.

2.0 REFERENCES

2.1 RDW 5.1, Radioactive Material Shipments 2.2 CNSI specific cask handling procedures 2.3 Nuclear Regulatory Countission Certificate of Compliance for specific casks 2.4 OP-9B, Solid Waste Processing 2.5 OI-8, Waste Solidification i 2.6 Hittman Cask Handling Procedures t 2.7 CSO 22, Strontium 89/90 and Transuranic Samples for Radioactive Material Characterization og 3.0 ACTIVITY CALCULATION FOR CASK CURIE CONTENT

, ineo i O N G.

jgo 3.1 Health Physics is to ensure that a sample of the waste has been wo taken to Chemistry for analysis. This sample should be identified m$ by the waste permit number (CHP-16) of the liner into which the

( waste will be transferred.

"8 Oo Prior to transferring any waste to a liner or cask, the analysis 04 results should be received and reviewed by the Nuclear Plant

-e Specialist or engineer assigned to radwaste who will in turn

& determine whether the waste is compatible with the intended liner and shipping cask.

., . . - _ . _ _ . _ - _ _ . . _ _ . . , _ . . . . _ _ _ _ _ _ . _ _ _ _ _ . _ _ . --_ --._ _ . - .m _ . _ . _ . . _ . . - _ , , . - - - _-

RDW 3.6

( Page 2 3.2 Resin The total activity in a resin liner is typically determined by  ;

isotopic analysis and by QADH calculation. The results from the two methods are compared and recorded on form CHP-157. If the results are not in reasonable agreement, then normally another resin sample will be taken and sent to chemistry for analysis.

3.2.1 Isotopic Analysis obtain the volume of resin transferred from Operations and the isotopic concentration from chemistry.

Total Liner Activity = Resin Volume x Isotopic Concentration Example: 70 ft3 of resin is transferred. Chemistry determines that the isotopic concentration is 10 pCi/cm3 Total Liner Activity = 70 ft3 x 10 pCi/cc3 x 28317 cm3/ft3 x 1 Ci IE+06 pCi ,

= 19.82 Ci 3.2.2 QADH Calculation QADH is a computer program that may be used to determine total liner activity. To use QADH, the isotopic concentration must be determined as well as the average radiation level around the liner.

The waste isotopic concentration is obtained from the resin sample sent to chemistry.  !

t The average radiation level may be determined as follows: l l

a. Determine the midplane of the resin within the liner. I For example, if the resin comes to a height of 4 feet,  !

then readings will be taken at the 2 foot elevation.  ;

}v

b. Find the highest contact radiation reading around the liner at the midplane. This will be the starting .!

point.

c. Determine the radiation level at four more equally spaced points. In all then, there will be 5 equally spaced points around the liner.

RDW 3.6 4  ! Page 3

d. Record the contact readings and also determine the radiation levels at 0.5 meter, 1 meter, and 2 meters from the liner surface.
e. Send all results'to the engineer or NPS assigned to radwaste.

3.3 Evaporator Bottoms Total Liner Activity = Evaporator Bottoms Volume x Isotopic Concentration 3.3.1 The volume of evaporator bottoms in a liner can be estimated by noting the waste feed speed and running time of the Atcor system when the liner is filled.

3.3.2 An alternate method of determining the volume of bottoms in

'the liner is to measure the level drop in the Atcor waste tank.

3.3.3 Conversion factors to be used to convert waste feed speed or tank level to volume can be obtained from charts in the Atcor cubicle.

3.3.4 The isotopic concentration (pci/cm3) can be obtained from Chemistry.

3.4 Mechanical Filters Filter activity is determined by two parameters, number of filters and type of filter.

l' .

3.4.1 The number and type of filters are obtained from Operations records or the waste permit log maintained by the Nuclear Plant Specialist or engineer assigned to radwaste.

3.4.2 The estimated activity per filter by filter type is tabulated below.

l

( Table 1 Activity of Filters

! Filter Type Activity per Filter Waste Evaporator Feed 5.1 mci Blowdown Evaporator Bottoms 5.2 mci Steam Generator Blowdown 0.00022 mci t

i

-,_,,.-,,,,m,.e-..,,---,,--r-n,,-- ,,-,.,,.n.,,,

,-__,-,,,,-,,,,,,.,,,,.-_._..,_,..._,,,_.,,,n,-,n,,,.,,__ - , , . . . _ , .

4 RDW 3.6 Page 4 3.4.3 Total Activity = Number of Filters X Activity per Filter Example: 60 blowdown evaporator filters are in a liner.

  • Activity = 60 filters x 5.2 mci / filter = 312.0 mci 3.5 Mixture of Wastes The activity of a mixture of resins, bottoms, and/or filters is found by calculating the activity of each component and adding them together.

4.0 RADWASTE LINER FILLING AND STORAGE 4.1 Prior to issuing a radiation work permit for transferring waste into a liner, Health Physics should assure that the Nuclear Plant Specialist or engineer assigned to radwaste has approved the isotopic analysis and volume of the waste.

4.2 Before the liner is filled, cover the liner with plastic. This will make deconning easier.

('

4.3 After the liner is filled by Operations ud before it is placed in storage behind the Atcor cubicle shield wall, a thorough radiation survey is to be taken using form CHP-21 Area 36.

NOTE: THIS SURVEY IS NOT REQUIRED FOR LINERS WHICH ARE FILLED WHILE CONTAINED WITHIN A SHIPPING PACKAGE (CASK).

Survey each area as indicated on form CHP-21 Area 36 and record results. Ensure that the highest radiation level is recorded by location.

4.4 Perform a removable external contamination survey of the liner.

i Sufficient smears should be taken so that results will be representative of the total liner area. Record results on form CHP-21 Area 36.

! Liner External Contamination Limits Under normal conditions, liners which have external removable contamination in excess of 22,000 dpm/100 cm2 will be decontaminated I to below this limit.

l NOTE: LINERS IN EXCESS OF 22,000 DPM/100 CM2 SHALL NOT BE PLACED IN THE UNDERGROUND STORAGE VAULTS UNLESS AUTHORIZED BY A I -

CHP SUPERVISOR.

(

i l- _ _ .__ _ _ . _ _ , _ _ _ _ . _ _ _ . _ _ _ _ . _ _ _

/

e c . .

RDW 3.6

( , Page 5 4.5 Record the following additional information on form CHP-21 Area 36.

i 4.5.1 Liner serial number 4.5.2 Liner waste permit number 4.5.3 Liner storage location 4.6 When completed, the yellow copy of form CHP-21 Area 36 is to be sent to the Nuclear Plant Specialist or engineer assigned to radwaste.

4.7 The Nuclear Plant Specialist or engineer assigned to radwaste should inspect the liners for solidificatior. (with proper consideration of ALARA) and verify the absence of free standing liquids. At this time the liner may be placed in the underground storage vaults if external contamination levels are less than 22,000 dpm/100 cm2, 5.0 PREPARATION FOR SHIPMENT 5.1 The Nuclear Plant Specialist or engineer assigned to radcaste should j

schedule the liner for shipment to a burial site.

(

5.2 On arrival'of the shipping package (cask):

5.2.1 Complete incoming removable external contamination survey of vehicle, trailer and cask.

5.2.2 Prepare radiation work permit for loading liner into cask as required.

5.2.3 Complete the radiation and contamination surveys as required by the specific cask checkoff forms.

5.2.4 Upon completion of loading, refer to the applicable portions of Radioactive Material Handling Manual for preparing the shipping package (cask) and vehicle for shipment.

l

-w.-y-- ----m +7w-+e e g-w ~ F=- <-wy- -ow-m r-q-+--ee-w-www---g-----we,---m-g -

ww.yw.-ywww-wee---,-we g--= vyw s g =-w o--e w w w- e- www,w-w-=w--v-en-++mmipww-ww--weee-