ML20059N013

Forwards Revised Data Re Final Survey for Decontamination Activities Performed in Yard Area Around Coal/Warehouse Bldg at Cimarron Facility

ML20059N013
Person / Time
Site:	07000925
Issue date:	11/15/1993
From:	Still E KERR-MCGEE CORP.
To:	Fauver D NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
NUDOCS 9311300056
Download: ML20059N013 (12)

Text

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i n) h's KERR-McGEE CORPORMION

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nean ucoce cEuTen. OKLAHOMA CITY, OKLAHOMA 73125 ENVfMONMENT AND HE ALTH MANAGC-' MENT Divls:ON EDWIN 1 STILL. DvM vicunesineNT wo omtcTon November 15, 1993 Mr. Dave Fauver, Project Officer Decommissioning and Regulatory Issues Branch Division of Low-Level Waste Management &

Decommissioning U.

S.

Nuclear Regulatory Commission Washington, D.

C.

20555-0001 Re:

Docket No.79-925 License No. SNM-928 Cimarron Corporation

Dear Mr. Fauver:

Cimarron Corporation on September 2,

1993 provided data concerning the final survey for decontamination activities performed l'

in the yard area around the Coal / Warehouse building at the'Cimarron d

facility.

We have determined the micro R/hr. readings contained in i

i the section labeled " Gamma Scans" are wrong.

The basis for this determination is discussed below.

As will be. apparent, the other survey data submitted are valid and the yard area meets release limits for residual contamination.

The September 2

submittal contained picocurie per. gram concentration data obtained by gamma spectrum analysis of-soil samples, counts per minute data obtained with a three-inch sodium iodide detector connected to a count / rate meter and the micro R/hr data obtained with a micro-R meter.

Shortly after the submittal, we recognized the micro R/hr readings were obviously erroneous, as the usual background at the site is on the order of 6 to 8 pR/hr, whereas the readings reported were on the order of 1 to 2 pR/hr.

The micro R/hr readings were obtained using a Ludlum Model 12-S Micro-R' Meter, Serial Number 9081.

Calibration records show the

' instrument responded.within established parameters using a Cs-137 Tech-Ops Calibration standard. Review of dose rate surveys taken with.

the instrument, however, showed background readings began a gradual decrease earlier in 1993.

I The instrument was sent'to Ludlum for evaluation and calibration.

Ludlum determined a resistor was-faulty.

As shown in' Attachment A',

h the resistor was replaced, calibration was done and the instrument now

()

works properly.

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Dave Fauver Page 2 November 15, 1993 The backfilling of the yard area had been completed prior to determining the problem with the micro-R meter.

However, we have redone the gamma scans on the backfilled area, using a 10 X 10 meter grid. The results are provided in Attachment B, along with gamma spec results of surface soil samples obtained randomly.

Attachment C is a

sketch showing the coordinates for the locations of the measurements.

We have also established permanent " background check" locations for the site.

Instrument background will be checked at these locations daily prior to use and at the quarterly scheduled calibrations.

We note the micro-R meter survey was only one of three methods employed for determining the radiological status of the soil around the Coal / Warehouse building.

The data obtained by the gamma spec analyses and the count rate meter clearly show the area has been cleaned adequately.

s Please call me at 405/270-2934 if you have questions about this xj matter.

For your convenience, we are providing a copy directly to ORISE.

Sincerely, ETS:lld Attachments copy to:

J.

Berger, ORISE NRC-Glen Ellyn, Illinois Office J. Kegin/T. Moore /K. Morgan R.

Smith J. Stauter/Cimarron License File O

CIMARRON CORPORATION CIMARRON FACILITY COAL / WAREHOUSE YARD WALKOVER GAMMA SCAN AND DOSE RATE SURVEY AFTER BACKFILL OF AREA - 10 METER X 10 METER GRID DATE: SEPTEMBER 17,1993 & SEPTEMBER 28,1993

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3' DET MICRO-R/HR MICRO-R/HR 3'-DET MICRO-R/HR MICRO-R/HR

! LOCATION CPM

@ 1 METER

@ SURFACE LOCATION CPM

@ 1 METER

@ SURFACE I 120N-40E l

6170 7

7 ; 120N-50E 6100 6

7 130N40E 5990 7,

6 l130N-50E 6300 7

7 j 140N-40E 6650 6'

6 f 140N-50E 5920 6

7 150N-40E 6770 7

6 l 150N-50E 5690 7

6 160N-40E 6800 7

6 170N-50E 7210 7

6

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7 160N-50E 6720 6

7 180N-40E 6770 6

6

- 190N-50E 6430 7

7 190N-40E 7800 6

6 200N-50E 7540 7

8 200N 40E 5630 6

5 210N-50E 7710 7

7 210N-40E 7720 8

7 INSTRUMENTS:

LUDLUM 2221 S/N 102029. 3" X 1/2" Nal DET, UNSHIELDED BACKGROUND OF 5860 CPM NOT SUBTRACTED -

LUDLUM MICRO-R METER MODEL 19 S/N 75544 BACKGROUND NOT SUBTRACTED SITE BACKGROUND READINGS Highway Right Of Way Marker #1E, Bkg. @ 1M 6 @ Surface 6 High Way Right Of Way Marker #2W, Bkg. @ 1M 8 @ Surface 7 South Enviremental Sampler Bkg @ 1M 8 @ Su'1 ace 8 t

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' CIMARRON FACluTY COAUWAREHOUSE YARD WALKOVER GAMMA SCAN AND DOSE RATE SURVEY

. AFTER BACKFILL OF AREA - 10 METER X 10 METER GRID DATE: SEPTEMBER 17,1993 & SEPTEMBER 28,1993 3"DET MICRO-R/HR MICRO-R/HR 3"DET MICRO-R/HR MICRO-R/HR LOCATION CPM

@ 1 METER

@ SURFACE LOCATION CPM

@ 1 METER

@ SURFACE 120N-60E 5250 6

5 140N-70E 6200 6

7 130N-60E 6250 6

6 170N-70E 4960 7

6 140N-60E 6870 6

6 180N-70E 7610 7

6 170N-60E 7320 5

5 190N-70E 6780 6

7 180N-60E 6770 6

6 200N-70E 7130 7

7 190N-60E 7670 6

7 210N-70E 7240 6

7 200N-60E 6730 8

6 210N-60E 7880 8

7 INSTRUMENTS:

LUDLUM 2221 S/N 102029,3" X 1/2" Nai DET, UNSHIELDED

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BACKGROUND OF 5860 CPM NOT SUBTRACTED LUDLUM MICRO-R METER MODEL 19 S/N 75544 BACKGROUND NOT SUBTRACTED SITE BACKGROUND READINGS

' Highway Right Of Way Marker #1E. Bkg. @ 1M 6 @ Surface 6 High Way Right Of Way Marker #2W, Bkg. @ 1 M 8 @ Surface 7 -

South Enviromental Sampler Bkg. @ 1M 8 @ Suriace 8 i

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CIMARRON FACILIT/ COAL / WAREHOUSE YARD WALKOVER GAMMA SCAN AND DOSE RATE SURVEY AFTER BACKFILL OF AREA - 10 METER X 10 METER GRID

-j DATE: SEPTEMBER 17,1993 & SEPTEMBER 28,1993 3"DET MICRO-R/HR MICRO-R/HR 3"DET MICRO-R/HR MICRO-R/HR l

LOCATION CPM

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@ SURFACE 120N-80E 6060-7 7

120N-90E 6390 6

7 130N-80E 6380 6

6 130N-90E 6200 7

7 140N 80E 5960 6

7 140N-90E 6280 6

5 160N-80E 7140 6

8 160N-90E 5460 6

6 170N-80E 6990 6

6 170N-90E 6950 6

7 180N-80E 7010 7

7 180N-90E 7350 7

7 190N-80E 8140 7

7 190N-90E 7100 7

6 200N-80E 7690 7

7 200N-90E 7320 7

7 INSTRUMENTS:

LUDLUM 2221 S/N 102029, 3" X 1/2" Nal DET, UNSHIELDED l

BACKGROUND OF 5860 CPM NOT SUBTRACTED i

l LUDLUM MICRO-R METER MODEL 19 S/N 75544 8 ACKGROUND NOT SUBTRACTED 1

SITE BACKGROUND READINGS Highway Right Of Way Marker #1E, Bkg. @ 1M 6 @ Surface 6 High Way Right Of Way Marker #2W, Bkg. @ 1M 8 @ Surface 7 South Enviromental Sampler Bkg. @ IM 8 @ Surface 8 l-e O

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CIMARRON FACILITY COAtJWAREHOUSE YARD WALKOVER GAMMA SCAN AND DOSE RATE SUP.VEY AFTER BACKFILL OF AREA - 1C METER X 10 METER GRID DATE: SEPTEMBER 17,1993 & SEPTEMBER 28,1993 3"DET MICRO-R/HR MICRO-R/HR '

3' DET MICRO-R/HR MICRO-R/HR LOCATION CPM

@ 1 METER

@ SURFACE, LOCATION CPM

@ 1 METER

@ SURFACE l 130N-110E 7

6 6140 10JN-100E 7250 7

7 140N-100E 6380l 6

7 !140N-110E G780 7

7 150N-100E 6370 7

7 ! 150N-110E 7620 7

6 6 h 160N-110E 7800 8

7 160N 100E 6780 7

l 170N-110E 7870 8

7 170N-100E 6820 8

6 180N-100E 7140 6

6 l180N 110E 7540 7

9 7 h 190N-110E 7330 8

9 190N-1005 7030 7

200N-100E 6780 7

7 !200N-110E 6070 6

7 INSTRUMENTS:

LUDLUM 2221 S/N ;02029. 3' X 1/2" Nal DET, UNSNIELDED BACKGROUND OF 5860 CPM NOT SUBTRACTED LUDLUM MICRO-R METER MODEL 19 S/N 75544 BACKGROUND NOT SUBTRACTED j

SITE BACKGROUND READINGS Highway Right Of Way Marker #1E, Bkg @ 1M 6 @ Surface 6 High Way Right Of Way Marker #2W Bkg. @ 1M 8 @ Surface 7 South Enviromental Sampler Bkg. @ 1M 8 @ Surface 8 i

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CIMARRON FACILITY COAUWAREHOUSE YARD WALKOVER GAMMA SCAN AND DOSE RATE SURVEY f

. AFTER BACKFILL OF AREA - 10 METER X 10 METER GRID DATE: SEPTEMBER 17,1993 & SEPTEMBER 28,1993 3"DET MICRO-R/HR MICRO-R/HR 3"DET MICRO-R/HR MICRO-RiHR LOCATION CPM

@ 1 METER

@ SURFACE LOCATION CPM

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130N-114E 6950 7

6 140N-114E 8180 8

7h 150N 114E 8290 9

160N-114E 7840 8

7 170N 114E 7950 7

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7 190N-114E 7470 8'

8 INSTRUMENTS:

LUDLUM 2221 S/N 102029,3" X 1/2" Nal DET, UNSHIELDED BACKGROUND OF 5860 CPM NOT SUBTRACTED LUDLUM MICRO-R METER MODEL 19 S/N 75544

BACKGROUND NOT SUBTRACTED ~

SITE BACKGROUND READINGS I

- Highway Right Of Way Marker #1 E, BRg. @ 1M 6 @ Surface 6 High Way Right Of Way Marker #2W, Bkg. @ 1M 8 @ Surface 7 -

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CIMARRON FACILIT( COAL / WAREHOUSE YARD AREA RANDOM SURFACE SAMPLING OF BACKFILL AREA SEPTEMBER,1993 GAMMA SPEC Soll RESULTS IN PCl/ GRAM URANIUM SURFACE SURFACE SURFACE SAMPLE SAMPLE SAMPLE LOCATION O - 6" LOCATION O - 6" LOCATION O - 6" 120N-40E 7.19 180N-70E 12.34 150N-100E 9.14 150N-40E 7.89 200N-70E 6.73 160N-100E 3.42 190N-40E 14.02 120N-80E 9.29 150N-110E 6.92 130N-50E 3.44 140N-80E 7.24 170N-110E 25.91 140N-50E 4.26 190N-80E 7.22 190N-110E 19.64 190N-50E 16.37 130N-90E 6.55 130N-114E 4.57 170N-60E 8.65

' 170N-90E 6.97 150N-114E 7.29 180N-60E 12.'/6 200N-90E 12.57 160N-114E 8.85 210N-60E 13.35 140N-100E 9.09 U

CIMARRON SOIL COUNTER GAMMA SPEC SOIL RESULTS IN PIC/ GRAM URANIUM SITE BACKGROUND OF 6 PIC/ GRAM URANIUM NOT SUBTRACTED 1

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