ML092720435

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Pu Plant Final Release Survey Non Production Area-Office Area
ML092720435
Person / Time
Site: 07000925
Issue date: 11/02/1989
From: Rogers W
Cimarron Corp
To:
Region 3 Administrator
Shared Package
ML092720355 List:
References
Download: ML092720435 (97)
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Text

Pu Plant Final Release Survey Non Production Area-Office Area When decommissioning started in this office area, four areas of concern were identified with an Eberline PRM-6 and Radeco alpha scintilation detector.

These areas were:

2

1. Men's change room sinks -

400 dpm/100 cm fixed-sinks removed

2.

H.P. decon room shower and sink -

2000 dpm/100 cm2 fixed-shower and sink removed.

3.

Floor under the laundry washers and dryer -

300 dpm/100 2

cm fixed -

Paint removed from floor.

4.

The attic above the Health Physics hall and decon room where the slot box exhaust, glove box exhaust, and SX exhaust ducts entered this attic area and turned up to 2

exhaust fan room -1000 dpm/100 cm fixed on supply duct-supply duct removed.

Our initial clean-up of this area consisted of removing the..

suspended ceiling tiles from the lunch room, office area 101, and office area 102.

These ceiling tiles were surveyed and released to clean trash because they were in such poor condition.

We removed a portion of the sheetrock ceiling above the H.P. decon room and the hallway just north of the H.P. decon room that was under the exhaust duct runs.

This sheetrock.averaged approximately 100 dpm/100 cm direct and 10 dpm/100 cm smearable, but had a maximum of 450 dpm/100 cm2 direct.

This sheetrock was drummed as LSA waste. We then vacuumed this entire area..

We used a Ludlum 2220 with a Ludlum 43-27, 43-68, or 43-4 detector with P-10 gas for our release surveys.

Our initial scan of floor and walls to two meters indentified two contaminated areas on Men's change room floor and one on west wall of Men's change room.

2 dpm/100 cm2.

These three spots were deconed.

For the entire survey of 3775 direct readings, we initially found 76 direct readings greater than 100 dpm/100 cm 2 but less than 300 dpm/100 2

cm2.

We surveyed around each reading greater then 100 dpm/100 cm2 and then after extent of contamination was identified, attempted to decon.

On our final release survey maps, we have 2

three readings that are greater than 100 dpm/100 cm Since these places meet release limits, no further decon was attempted on these spots.

Of the 3733 smears taken, no results were found to be 2

greater than 20 dpm/100 cm All smears were taken on Whatman smear paper and counted in a Hewlett-Packard 5560A (Low background) automatic sample counter.

Our maps included instrument used, detector, background, source responce, and MDA.

W.A. Rogers

)

Pu PLA11T RELEASE SURVEY PLAN

1.

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

Background will be main-tained at less than 100 cpm(200 dpm).

All areas greater than twice back-ground will be marked and reading will be taken with a release survey in-strument to document contamination 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 digitial readout re-lease 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 cm.

3.

All hot spots greater than or equal to 100 dpm/100 cm2 identified 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 approxi-mately 2 meter on a side squares 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 on a side squares.

Because of this, we will take readings on the bottom and each side of each rafter at 2 meter intervals 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 approxi-mately scale measurements in meters.

8.

Date provided on each map:

1.

Survey block numbers, identifiable on a scale drawing,

a.

room or area name or number.

b. surfaces 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 ltmit, background, and source response of instruments used in survey.

4.

When a block surveyed is below the sensitivity of the instrument,-

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.

13.

In the laboratory and office areas all wall surfaces will be included in the floor area because the walls are only 3 meters in height.

16.

In all other areas except the laboratory and offices the bottom 2 meters of wall area will be included in floor data.

17.

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

18.

Release limits shall be (see attached sheet).

0

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1AULt ACCEP IADLtE suniiACE: CUil AlI~it AT 1011 LEVELS I

IIUCL IDES8 AVERAGEb c f WlfWUiib d I REJIOVADLEbi 0 U-nat, U-235, U-230, and associated decay products Iransuranics, Rla-226, Ra-228, Ih-230, Ili-22, Pa-231, Ac-221, 1-125. 1-129.

lh-nat. 11;-2)2, Sr-90.

Ra-223, Ra-2Z4, U-232, 1-126, 1-131. 1-133 Deta-garura emitters (nuclides with decay trodes other than alpha eplisslon or spontaneous fission) except Sr-90 and others noted above.

5.000 dpm./100 cm2 15,000 dpil Q/1O0 cm2 100 dpm/IO0 coi2 300 dpm/100 ci.2 1000. dpm/ 100 cm2 3000 Jpm/100 cu"2 5000 dpm p0/100 cm2 15,000 dpji O/lI00 col2 1,000 dpm./100 colt 20 dp411lO0 cm2 200 dpm/100 cm2 IOUO dpin Oy/l00 c1112 allhre surface contamination by both alpha-and be ta-gainna-emlttIng nuclides exists, the limits nucildes should apply independently.

established for alpha. and beta-ganuna-ei ttLIl bAs used In this table, dpm (disintegrations per minute) mieans the rate of emission by radioactive material as determined by correcting the

-counts per minute observed by an appropriate detector for background, efficiency, aild geometric lactors associated with the InsLrumentatIone clleasurements 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.

dlhe maximum contamination level applies to an area of not more than 100 cm2.

elhe amount or removable radioactive material per 100 cm2 or surface area should be determined by wiping tilet area with dry filter or sort absorbent paper, applying moderate pressure, and assessing the amount of radioactive material on thie wipe with an appropriate Instrumet. or k.okin efficiency.

lhen removable contamination on obJecti of less surface area Is determined, the pertinent levels should be reduced proportionally and the entire surface should be wiped.

(lhe average and maximum radiation levels associated with Surface contamination resulting from beta-gaurona emitters should not exceed 0.2 nradlhr at I cm and 1.0 mrad/Izr at I cm. respectively, measured throughI nIot more than 7 solilirJams per square centimeter of total absorber.

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