ML092730258

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Pu Plant Production Hall Attic Conduit Lines and Piping
ML092730258
Person / Time
Site: 07000925
Issue date: 11/02/1989
From: Rogers W
Cimarron Corp
To:
Region 3 Administrator
Shared Package
ML092720355 List:
References
Download: ML092730258 (94)
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{{#Wiki_filter:PU PLANT PRODUCTION HALL ATTIC CONDUIT LINES AND PIPING When decommissioning started in the Production Hall this attic area was isolated from the hall by a sheetrock ceiling. This attic area contained three contaminated systems plus numerous electricial, plumbing and duct systems. .The contaminated systems were:

1.

Glovebox exhaust system: Greater than 100,000 dpm/100 cm2 smearable internal contamination that was processed as TRU waste.

2.

SX exhaust system: Greater than 100,000 dpm/100 cm2 smearable internal contamination that was processed as TRU waste.

3.

Vacuum Transfer system: Approximately 100,000 dpm/100 cm2 smearable maximum internal contamination that was processed as TRU waste. After removal of these contaminated systems, the sheetrock was removed to increase access to this attic area. Approx-imately 70% of conduit and piping was removed from this attic area during clean-up, but approximately 1000 meters of piping remained to be surveyed. To conduct this survey, we used a Ludlum 2220 with a Ludlum 43-4 probe modified to use P-10 gas. 2 Using this long, narrow 60 cm detector to survey small 2 diameter piping, we used CPM-Bkg X 12 (CF) = dpm/100 cm Our minimum detectable activity (CF X 1.96 (2--) was 57.61 dpm/100 cm2.

Each pipe that was longer than one meter was direct surveyed on two sides (top and bottom if accessable) every two meters and a 2 smear was taken of approximately 100 cm All smears were taken on Whatman smear paper and counted in a Hewlett-Packard 5560A auto-matic sample counter. No smearable results were greater than 20 dpm/100 cm2. Of the 687 direct reading taken 46 reading were greater than 100 dpm/100 cm2 and less than 300 dpm/100 cm2. Six 2 reading were greater than 300 dpm/100 cm and less than 500 dpm/100cm2 and two readings were greater than 500 dpm/100 cm2 and less than 700 dpm on our initial release survey. All reading _r. 2 idenified as greater than 100 dpm/100 cm on this initial survey were resurveyed and reading were taken continueously along these pipe to identify the extent of contamination. All the contaminated spots were deconned and then resurveyed. All lines in this attic area have been tagged with numbers and survey sheets have these identifing numbers on them. W.A. Rogers

00 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.

Table I-1. Acceptable surface contamination levels Nuclidesa Averageb'c'f Maximum b,d,T Removahleb~eJ U-nat, U-235, U-238, and 5,000 dpm a/100 cm 2 15,000 dpm a/100 cm2 1,000 dpm a/100 cm2 associated decay products Transuranics, Ra-226, Ra-228, 100 dpm/100 cm2 300 dpm/l00 cm 2 20 dpm/lO0 cm2 Th-230, Th-228, Pa-231, Ac-227, 1-125, 1-129 Th-nat, Th-232, Sr-90 1,000 dpm/100 cm2 3,000 dpm/100 cm2 200 dpm/100 cm2 Ra-223, Ra-224, U-232, 1-126, 1-131, 1-133 Beta-gamma emitters (nuclides 5,000 dpm 6y/l00 cm 2 15,000 dpm By/lO0 cm2 1,000 dpm By/l00 cm2 with decay modes other than alpha emission or spontaneous fission) except Sr-90 and other noted above. aWhere surface contamination by both alpha-and beta-gamma-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) mean!s the rate of emission by ridioictive material as determined by correcting the counts per minute observed by an appropriate detector for background, efficiency, and geometric factors associated with the instrumentation. CeMeasurements of average contaminant should not be 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 cm2. eThe amount of removable radioactive material per 100 cm 2 of surface area should be determined 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. !The 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. 0 0

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