ML20195G635
| ML20195G635 | |
| Person / Time | |
|---|---|
| Site: | 05000142 |
| Issue date: | 06/21/1988 |
| From: | Mclaughlin J CALIFORNIA, UNIV. OF, LOS ANGELES, CA |
| To: | Alexander Adams NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8806280078 | |
| Download: ML20195G635 (6) | |
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UN)VEllSilT OF CALIFOllNIA, LOS ANGELES UCLA
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Ge n s t a. n o n. ten ist.. tm sw.etts an o nins-us nit (.o us t ant iv o I
usit ups tu. SnT4 ( ht't ag;r RESEARCil as OCCUPATIONAL SAFETY /HAD14 TION SAFETY AMROJ CENTER FOR Tile ilEALTil $CiENCES U)S ANCELES, CA!JFORN!4 90024 June 21, 1988 Mr. Alexander Adams U.S. Nuclear Regulatory Commission Waanington, D.C.
20555 Attn Document Control Desk Docket Number 50-142
Dear Mr. Adams:
Please replace the enclosed four pages in the Pnase 11 Plan for our former reactor facility, which was 3ent on June 10, 1988 from J.E. McLaughlin to A. Adams.
Some editorial corrections were made on pages 6,12,15, and 16.
Sincerely yours,
$$isys f/ Wf
[jJames E. McLaughlin Acting Director t
Research & Occup. Safety JEM:cm Enclosures Y
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8806230070 000621 PDR ADOCK 05000142 P
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University of California Docket No. 50-142 at Lcs Angeles cc:
Mr. Neil' C. Ostrander, Maria 3er Committee To Bridge The Gap Nuclear Engineering Labora' 1637 Butler Avenue #203 School of Engineering and Los Angeles, CA 90024 Applied Science University of California Mr. John Bay at Los Angeles 1022 Peralta Street Les Angeles, CA 90024 Albany; CA 94706 Attorney General Mr. James H. Heelan 1515 K Street Director, Society Services Sacramento, CA 95814 American Nuclear Society 555 N. Kennington Avenue California Department of Health La Grange Park, IL 00525 Attn: Chief, Environmental Radiation Control Unit Roder Kohn, Esq.
Radiological Health Section 524 11 th Street 714 P Street, Hoom 498 Manhattan Beach, CA 60266 Sacramento, CA 95814 Robert M. Meyers Mr. Daniel Hirson City Attorney 3469 Branciforte Drive 1.ynn Nalicoff Santa Cruz, CA 95065 Deputy City Attorney 1685 Main St., Room 310 William H. Cormier, Esq.
Santa Monica, CA 90401 Office of Administrative Vice Cnancellor Roger Holt, Esq.
University of California Office of City Attorney 405 H11 gard Avenue 200 Nortn Main St.
Los Angeles, CA 90024 City Hall East, Room 1700
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Los Angeles, CA 90012 Christine Helwick, Esq.
I Glen R. Woods, Esq.
U.S. Nuclear Regulatory Commission j
Office'or General Counsel Region V 590 University Hall Office of Inspection & Enforcement 2200 Uraversity Avenue 1450 Maria Lane, suite 210 Berkeley, CA 94720 Walnut Creek, CA 94596-5368 Dean Hansell 302 South Mansfield Ave.
Los Angeles, CA 90036
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1.3.1 Pipes, Drainlings, and Ductwork The primary water system has also been removed and the resioual equipment in the process pit consists of a sump, a sump pump and two 250 gallon holding tanks. Tne sink and shower drainlines merge with three other floor 3
drains to empty into the sump. A separate drain from the reactor core also passes to tne sump. Swipes of inlets and outlets of these drainpipes and the accessible points of the exhaust system ductwork when counted on a beta counter, revealed all surface contaminatioa levels below the limits prescribed in Table 1 of USNRC H9gulatory Guide 1.66.
However, it is possible that tne pipes and drainlines may have been' activated from neutron streaming.
Further surveys will be performed during Phase 11 as we gain increased access.
l The sump is a reservoir 24 inches wide, 24 inches lond and 61 inches aeep.
At the bottom there is about an inch and a half of sludge covered by approximately 24 inches of water. Samples of the water and the sludge were
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individu 61y counted on a high resolution Ge(L1) spectrometry system and a 11guld scintiJ iation spectrometer for possible contamination. The results are reported in Table 1.2.
Table 1.2. Activity of Radioisotopes in the_Supp Concrete Isotopes Half-Life Water Activity
- Sediment Activity ** Total (years)
(uC1)
(pC1)
(pC1)
Co-60 5.27 10.3 50.0 50.0 26.0 127.0 127.0 Eu-152 13.6 11 - 3 12 3 100 16.3 52.1 253.8 272.1 11.6 56.7 56.7 C-14 5730.0 100 1d.3 100.0 487.5 505.6 3
Volume of Sump water is approximately equal to 7.63 ft i
- Volun.e of the sediment is approximately equal to 0.5 ft3 ensity or tne sediment is taken to be that of concrete, i.e.,
200 lbm/ft 1.4 The Decommissioning Approach For Phase II, UCLA intenas to complete decommissioning of tne facility for "unrestricted" use by availing the services of an outside contractor.
"SAFST0H" is no longer under consideration.
The selected decom31ssioning alternative is "DECON".
Af ter the approval of this plan by the NHC, UCLA will soon distribute a Request for Proposal to potential commercial bidders.
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removal, and transportation of radioactive and non radioactive mater 8al from the alte in accordance with all governing regulationa.
However, UCLA snall oversee and review all tasks during the decommissioning project.
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UCL.i will retain overall respor sibility for health and safety considerations during recommissioning.
2. 34 Cost Estimate and Funding The cost of Phase II decommissioning is estimated to be $200,000 exclusive of internal personnel costs.
This includes the estimated cost of the termination survey.
The School of Engineering and Applied Sciences (SEAS) has approved this cost.
30 DISMANTLING AND DECONTAMINATION TASKS Al'D SCHEDULES 31 Tasks The Contractor's tasks in Phase 11 will include the following:
razingtheconcretemonolithandpedesgaltofloorlevel, a.
b.
excavatior, of the approximately 52 f t of concrete down to about 22 inches below floor level, c.
removal of four large concrete blocks, d; packaging materials for appropriate land burial, e.
transfer of such material to burial site, f.
decontamination of the reactor room and nearby areas, and g.
final release survey of the facility.
3.2 Schedule The schedule for the decommissioning project af ter approval of tnis plan by the NRC is shown in Table 31 12.
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conventional concrete, the remainder As heavy concrete.
The monolithic structures contain reinforcing bar, electrical conduit-three steel beam port liners (each wing), and a steel plate in the western, conventional concrete, region of each wing. The single drawing that refers to the plate specifies otily a 24 inch width.
The thickness scales to 1/2 inch, the height is not specified.
3.3.2.4 The Pedestal: The pedestal runs the entire east-west length of the shield at a width of approximately 5 feet and rises 14 to 16 inches above the floor level.
The height and width change in discrete steps to reduce neutron streaming paths.
The pedestal contains the embedded part of the reactor "framework" which supported the control blade system within the core.
It is rectangular in outline consisting of two parallel 5 inch 5.7 lb. channels, each about 76 inches long with 24 inches long end pieces of the same stock.
Tt. 21 inches inside diatance between the long channels is further fixed by two angles 5 inches x 5 inches x 5/16 inches perpendicular and welded to the channels.
One flange of each c;;annel and one leg of eacn of the angles is visibly flush with the top surface of the pedestal.
Because of mass and close proximity to the core center, this entity is likely to be the single most radio =qtive object to be encounterec in the demolition work.
The pedestal contains some abandoned aluminum pipe and manifolding, and a centered floor drain which empties to the sump.
3 3.2.b Removable Blocks:
All of the removable blocks are fitted with lif ting lugs and are manageable with the 10 ton crane and 4 chain sling.
Tnese blocks are described in Table 3 3.
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Table 3 3. Rrmovablo Blocks
. Type *
. Dimension Volge Density Mass 3
LxWxH (ft )
(1bm/ft )
(tons)
(inches)
C8 90 x 50 x 30 92.25 207 9.55 Embedded Steel 1.50 480
. 0 36 C9 84 x 48 x 30 68.79 as' 8.50 Embedded Steel 1.21 480 0.29 A+B 66 x 20 x 69 37.93 247 4.68 Void (15 ports) 11.68 0
0.00 Embedded Steel
'2.13 480 0.51 A + B Port Plugs Concrete 10 32 247 1.27 Steel
^1.56 480 0.38 C+D 66 x 10 x 69 42.03 247 5.19 Void (15 ports) 7.46 0
0.00 Embedded Steel 3 21 480 0.77 C + D Port Plugs Concrete 6.18 247 0.76 Steel 1.28 480 0.31
- The location or these blocks are shown in Fig. 3 1.
2 inches x2 inches x 1/4 inches angle (3.19 All bg)eks are edged with lbm/ft and contain varying amounts of reinforcing bar.
The rebar is sometimes terminated by welds to the center of edge strips.
Blocks C-8 and C-9 each contain three cylindrical, vertical steel beam port liners, 35 inches x 3125 inches x 30 inches in C-8 and 2.5 inches x 2.125 inches x 30 inches in C-9.
Blocks A + B and C + D were cast as four separate entities each 10 inches thick and subsequently welded in pairs along adjacent edge strips to form two blocks each 20 inches thick.
Block A + B and block C + D each contain 15 rectangular beam ports with matching plugs.
The void volumes indicated in the table above are the volumes of the plugs, consequently if the plugs are regarded as a portion of the block, they do not contribute incremental volume to the amount of concrete to be removed.
3 3 2.6 Excavation:
The volume is that of a spherical segment of base radius 49 inches extending to a depth of 22 inches below floor level.
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