ML092730257

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Pu Plant Exhaust Fanroom
ML092730257
Person / Time
Site: 07000925
Issue date: 11/02/1989
From: Rogers W
Cimarron Corp
To:
Region 3 Administrator
Shared Package
ML092720355 List:
References
Download: ML092730257 (35)
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Text

Pu Plant Exhaust Fanroom This room contained the final filter housing and exhaust fans for:

1.

Solvent Extraction glovebox fans 33 and 34

2.

Glovebox system (one of two systems) fans 32 and 33

3.

Hood and slotbox system fans 73 and 74

4.

Room exhaust systems fans 28, 29, and 30 Note: Intermediate and final filter housing for fans 79 and 80 were located in Chem make-up.

The final filter housings were located up stream of the exhaust fan units.

We were able to decon and release all fan units, except fans 33 and 34.

We found isolated spots of contamination down stream of exhaust fans 33 and 34 (2,000 dpm direct Max.,

300 dpm smearable).

Because of the way this duct was assembled, and the difficulty of decon, we shipped it as LSA waste.-.

Each filter housing was constructed with no bottom in it and they had been caulked to the cement floor.

When we removed exhaust fans 33 and 34)we had greater than 100`,000 dpm/100 cm2 direct on the floor under the final filters forethese units.

Extensive cleaning and blasting was required to decori the floor under these filter units.

Because of the difficulty."in removing these large exhaust fans from this room, we still have units 73, 74, 28, 29, and 30 with release survey sheet in this room.

We used a Ludlum 2220 with a Ludlum 43-17 low energy gamma probe to identify all cracks and seams that might need decontamination.

A Ludlum 2220 with a Ludlum 43-68, 43-4, or 43-27 was used with P-10 gas for all alpha release surveys.

All smears were taken on Whatman smear paper and counted in a Hewlett-Packard 5560 A (low backaground) automatic sample counter.

W. A. Rogers

Pu PLANT RELEASE SURVEY PLAN

1. For initial decontamination all surfaces will be scanned with an Eberline PRM-6 with a Radeco alpha scintillation probe.

Back-ground will be maintained at less than 100 CPM(200 dpm).

All areas greater than twice background will be marked and reading will be taken with a release survey instrument to document cont-amination levels and random large area smears will be taken.

2. After these initial areas are decontaminated, all floor surfaces and the base of each wall will be completely surveyed with a digital readout release instrument and a Ludlum large area gas proportional alpha detector and random smear samples will be taken.

Release instrumentation shall have a minimum detectable level of at least 50 dpm/100 cm2.

3. All hot spots greater than or equal to 100 dpm/100 cm2 ident-ified will be decontaminated.
4. A random survey with a release instrument will be taken on the walls and ceiling to try to identify any other problem areas.
5. If no problems are identified, each room will be gridded off into approximately 2 meter on a side square on the walls and floor and five readings will be taken in each grid.

Readings shall be taken in the center and at the midpoint from the center to each corner.

6. Each ceiling has closely spaced rafters that will not be easily divided into 2 meter squares.

Because of this, we will take readings on the bottom of each rafter at 2 meter inter-vals and one reading centered on the ceiling between rafters.

Readings on each rafter will be staggered one meter.

7. These release readings will be documented on a map that is drawn to approximately scale measurements in meters.
8. Data provided on each map:
1. Survey block numbers, identifiable on a scale drawings.
a. room or area name or number.
b. surface surveyed.
c. type of measurement and units.
2.

Name of surveyor taking measurements, date of survey, and location.

3.

Type, model number, calibration data, sensitivity limit, background, and source response of instruments used in survey.

4.

When a block surveyed is below the sensitivity of the instru-ment, the fact that such a measurement was made should be included as significant data.

9. All release survey smears will be taken on Whatman smear paper and counted in the automatic sample counters.

Each smear will cover approximately 100 cm2.

10.

There will be at least 30 survey blocks in each area to be released.

11. Piping and ductwork will be surveyed on all accessable sides at 2 meter intervals.

If more than one line is running parallel in a pipe rack, readings shall be staggered at one meter intervals.

12. All readings taken that only cover part of a probe area will be corrected to dpm/100 cm2.
13.

No survey block will measure less than one meter on a side.

14.

No survey block will measure more than 3 meters on a side.

15. All portable release survey instruments will be calibrated quarterly and all instruments in use will be source checked daily.

9 Table 1-1. Acceptable surface contamination levels Nuclidesa Ave rage L'It IJ, Max i M

)

Removal) I c '?

U-nat, U-235.

U-238, and associated decay products Transuranics, Ra-226, Ra-228, Th-230, Th-228, Pa-231, Ac-227, 1-125, 1-129 Th-nat, Th-232, Sr-90 Ra-223, Ra-224, U-232, 1-126, 1-131, 1-133 Beta-gamma emitters (nuclides with decay modes other than alpha emission or spontaneous fission) except Sr-90 and other noted above.

5,000 dpm 1:/IO/

cm2 100 dpm/100 cm 2 1,000 dpm/100 cm 2

S,000 dpm By/1O0 cm2 15,0OO dplm u/lO0 cm 2 3010 dpm/II00 ciaZ 3,000 dpm/100 cm2 15,000 dpm 1-/100 cm 1,000 dpm (0/l00 cm2 20 dlnm/10( cm7 200 dpm/l00 cm?

1,000 dpm 1/1100 cm2 a'Where surface contamination by both alpha-and heta-Ramma-emitting nuclides exists, the limits established for alpha-and beta-gamma-emitting nuclides should apply independently.

bAs used in this table, dpm (disintegrations per minute) means the rate of emi-,sion by r:,,li,,mctive material as determined by correcting the counts per minute observed by an appropriate detector for background, efficiency, and geometric factors associated with the instrumentation.

C Measurements of average contaminant should not he averaged over more than I square meter.

For objects of less surface area, the average should be derived for each such object.

dThe maximum contamination level applies to an area of not more than 100 cm 2.

0The amount of removable radioactive material per 100 cm2 of surface area should be dctermiiied by wiping that area with dry filter or soft absorbent paper, applying moderate pressure, and assessing the amount of radioactive material on the wipe with an appropriate instrument of known efficiency.

When removable contamination on objects of less surface area is determined, the pertinent levels should be reduced proportionally and the entire surface should be wiped.

fThe average and maximum radiation levels associated with surface contamination resulting from beta-gamma emitters should not exceed 0.2 mrad/hr at 1 cm and 1.0 mrad/hr at 1 cm, respectively, measured through not more than 7 milligrams per square centimeter of total absorber.

C PLANT I- -

0flATION SUI RVFY RELEASE REPORT.70 MATERIAL TRANSFER NO.

DAT-E, KM N DESCRIPTION MODEL SERIAL 1

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LIMITS 20 dpm/100 cm 2

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