ML20116L326

Requests for Modification to Reactor Decommissioning Plan for Us Army Matls Technology Lab Research Reactor,Rev 1 Dtd Oct 1991.Mod Will Not Require Removal of Steel Liners from Gamma Facility or Sumps Unless Decontamination Impossible

ML20116L326
Person / Time
Site:	05000047
Issue date:	11/06/1992
From:	Naughton J ARMY, DEPT. OF
To:	Alexander Adams Office of Nuclear Reactor Regulation
References
NUDOCS 9211180248
Download: ML20116L326 (6)

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XJALw 6 November 1992 Risk Management Office Docket No. 50-47 Mr. Alexander Adams Non-power Reactors, Decommissionlag and 2nvironmental Project Di rect orat e Division of Reactor Projects Office of Nuclear Reactor Regulation OWFN MS. 1IB20 Wanhington, D.C. 20555

Dear Mr. Adams:

This is a request for modification to the Reactor Decommissioning plan for the U.S. Army Materials Technology Laboratory Research Reactor, Revision 1, Dated October 1991.

Specifically, to modify sections 3.4.6, Basement Sumps and, 3.4.7, Gamma Facility and Storage Tubes. This modification will not require the reiuoval of the steel liners from the gammt facility or sumps, the floor drains and connecting lines or the storage tubes unicas they cannot be decontaminated to the levels specified in Reference 4 to the Decommissioning plan.

This propose <' modification to the Decommissioning plan does not increase the probability of contamination being released.

The welded steel liners do not permit the passage of water t o the substrate. The storage tubes, although not lined wi+h steel, show only trace icvels of contamination.

Post-decontamination / termination burveys will consist of:

An alpha autvey with a large area gas flow proportional detector; A beta survey with 3 large area gas flow proportional detector; A survey with a sodium iodide R meter; Smears.

This request for modi'ication of the plan is being made because survey results for these structures show incidental levels of activity. There is no indication of contamination on the substrate concrete. Any activity leached into tue concrete substrate or remaining on the structures will be identified during the termination survey.

We believe that this modifcation to the Decommissioning plan does not raise any unrcoolved safety W ues, nor const!tute any increased risk to decommissior,ing personnel or the public. We ask that the NRC provide an expedited review to this request for modification, to the degree reacticable.

Decommissioning personnel are hoping to complete the work prior to the end of the year, and to take advantage of the resulting cost reduction and schedule improvement.

Au expedited review would be appreciated.

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- Docket-No. 50-47 Copies of section 3.4.6 (Basement Sumps), 3.4.7 (Gamma Facility and Storage Tubec) and Figure 3-8 (Plan View of the AMTL Reac'.:or Basement Floor) are -

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The basement contrins llVAC, water conditioning equipment g;p and components, barricades, and other m heellaneous equipment, coolan d

will be removed from the facility in a convenient order, with the co These items hb:

related equipment beine removed last to minimize the potential for n

contamination of materials.

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The basement equipment can be hoisted to the main floor throug

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the 7-by 7-ft removable hatches in the main floor (see figure 3 7) er of AP 4t; 9T!p The coolant equipment enclosure walls (figure 3 8) should be rem

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Oh7,d 3.4.6 Basement Sumps t

9tj The two basement dry sumps (figure 3-8) shall be removed by cutt Q

steel liners away from the concrete, ng the chipped away as needed to remove contaminated materials.lhe p

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The floor drains and connecting ilnes shall be chipped out from th inlet to where the lines enter the sump.

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The sunp pump shall be r" moved, the sump liner cut away from the concrete, and concrete removed, as needed, and materials disposed of v'

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3,4.6 Ilasement Sumps

'lhe two basement dry sumps (1:igure 3-8) shall be decontaminated, if decontamination efforts me unsuccessful at reducing contamination levels below i

those sirc.fied in iteference 4, all or portions of the steel liner will be removed and any contaminated concrete chipped, scabbled or removed as needed.

The ihmr drains and connecting lines shall be decontaminated, as required. if the post-decontamination survey shows levels in excess of the levels specined in Iteference 4, any contaminated Door drains or contaminated connecting lines will be removed and the concrete chipped away as needed to remove the contaminated materials, in addition, any Door drains and connecting lines will be removed if they cannot by adeuuntelv surveved.

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The sump pmnp shall be removed and the sump decontaminated, if decontamination efforts are unsuccessful at reducing contamination levels below those specified in iteference 4, all or portions of the steel liner will be removed and any contaminated concrete chipped, scabbled or removed as needed, l'its or openings made in the floor shall be covered and/or barricaded to prevent personnel injury from falls.

4 3.4.7 Ganuna Facility and Stnrage Tubes The gamma facility storage rack shall be removed and the gamma facility shall be decontaminated, if decontamination efforts are unsuccessful at reducing contamination levels below those specified in iteference 4, all or portions of the steel liner will be removed and any contaminated concrete chipped, scabbled or removed as needed.

The beam tube storage tubes shall be decontaminated, as required. If the post-decontamination survey shows levels in excess of the levels specined in iteference

4. the contaminated portion of the storage tubes will be removed and any contaminated concrete chipped away as need.:d to remove all contaminated material.

Openings resulting from the removal of storage tubes shall be covered or barricaded to prevent personnel injuries.

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Plan view of the AMTL Reactor basement floor.

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J 3.4.7 Ganrna facility and Storage Tubes 4

The gamma-ray facility (figure 3-8) steel liner and storage rack shall b cut away from the concrete and the concrete surveyed and scabbled as remove contamination.

The storage iabes (figure 3 8) shall be removed using coring, cutting, or other methods chosen by the contractor to separate the tubes indie'1ually or in groups from the basement floor, b' !

The openings resulting from removal of the storage tubes shall b7 temporarily covered to prevent personnel injuries.

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3.4.8 Pool l

If not phased in earlier, the pool demolition is the next step after the basement has been decontaminated and all materials removed.

If pool j

demolition was begun earlier, progress can now be made beyond the main 0;

During pool demolition, the operating floor shall also be removed back to the supporting columns.

Pool structural materials are very likely to be contaminated in the area q

above the reactor core and for a short distance below the core ar q

There is also a high probability of contamination in the hold-up tank below the reac pool.

Extra care, such as the use of temporary work enclosures, must be taken during this phase to avoid unnecessary exposure to workers and to prevent j

spread of contamination, j

Demolition of the pool monolith can be accomplished utilizing t

techniques, sawing, drilling and wedging, or other methods proposed by the y

contractor and approved by the Army.

In any case, th(,, methodology to be used 'i f

in this phase must be approved by the Army before imphmentation to ensure y

that the method will minim 17e the potential for spread of airborne

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contamination.

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