ML20036A405

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Forwards Results of Termination Survey of Pool Liner Removal Conducted on 930422-23,to Address Findings in Insp Rept 50-192/93-01.Univ Will Continue to Maintain Groundwater Pumping & Monitoring Program Until Survey Results Complete
ML20036A405
Person / Time
Site: 05000192
Issue date: 05/03/1993
From: Bauer T, Wehring B
TEXAS, UNIV. OF, AUSTIN, TX
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9305110179
Download: ML20036A405 (10)
v • d • e


Text

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DEPARTMENT OF MECHANICAL ENGINEERING

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{kh!)$ THE UNIVERSITY OF TEXAS AT AUSTIN y*3j NuclearEngi,mringTeachingLdwratory 10100BarnetRwd Austin Texas 78738 (512)471-5787* FAX ($12)471-4589 May 3, 1993 Document Control Desk U.S.

Nuclear Regulatory Commission w

Washington, DC. 20555 s

s

Subject:

Inspection Report 50-192/93-01 Confirmation survey Removal of pool 31ner

Dear Sir:

The University of Texas scheduled removal of the pool liner in Taylor Hall room 131 for the week of April 19.

Removal of the liner by the project contractor, Quadrex Recycle Center, was completed April 23.

Surveys subsequent to the liner removal included scans with a thin window pancake GM type probe, direct 1 minute readings with the probe and contamination swipes of the remaining tank structure surface.

All measurements were within the release criteria of Regulatory Guide 1.86.

Previous measurements with a RS-111 had demonstrated gamma exposure rates less than < 5 pR/hr (submittal letter December 17, 1992 and March 22, 1993).

Pool liner material, aluminum, was transported to Quadrex Recycle Center for survey for release or disposal.

No contamination of the liner exceeding Reg. Guide 1.86 was found.

Observation of the removal of the liner noted one to two hundred milliliters of water trapped between the concrete wall and the aluminum liner.

Surveys in the area of the entrapped water indicated no residual activity.

Liner contact with the structural concrete did not contain areas that could contain amounts of water in excess of 100 - 200 milliliters.

Except for the noticed drainage no accumulations of water from pool overflow were indicated.

Radioactive contamination previously noted along the surface edge of the pool liner were essentially the same after removal of the liner.

Remedial actions were taken to remove small amounts of concrete in the previously defined areas along the pool liner to concrete interface and in the flat area adjacent to the pool.

These areas exceeded release levels at.

several spots prior: to the remedial work.

Material removed and rubble from the liner removal was sent to the Quadrex Recycle Center for release or disposal.

A small fraction of 1 cubic foot was removed from the surface area adjacent to the pool.

100022

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l PDR ADOCK 05000192 G

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Enclosed are tables of the surveys, of the pool area with the liner-removed..This data supplements the submittals,of Dec.

l 17, 1992 and March 22, 1993.

No new sources of radioactivity

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were found~.

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The University continues to maintain a ground water pumping-1 and monitoring program until the results of the NRC confirmation survey are complete.

e Sincerely Iw 2. 3*"

i T.L. Bauer Assistant Director

't Nuclear-Engineering Teaching Laboratory j

Approval:

i ow vJ. ale %

Bernard W.

Wehring, director Nuclear Engineering Teaching Laboratory

Enclosure:

Termination Survey, Pool Liner Removal cc:

1' Adams, NRC with Enclosure 3

' agion IV USNRC

.-Monroe UT SO R.'Charbeneau ' Enclosure and Inspection Report-50-192/93-01.

J. Decamp K. Diller C. Franklin

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G.J;-Fonken g-D.

Klein W.

Livingston

- e E.-Sutton H. Ward H. Wilson H. Woodson l

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I The University of Texas Termination Survey April 22-23, 1993

)

'I Pool Liner Removal I

i 3

Table 1 i

Direct readings (drt) consist of #1 - #60.

  1. 1 is the top level south side of tank.

Measurements are numbered top to-bottom'

.j each level moving clockwise around the tank.

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---> West-

  • 47 54 1

.6*

48 55 2

7 1

49 56 3-8-

50 57 4

'9 l

51 58

.5-10

-l 52 59

.53 60

  • 40 41 42 43 4.4 45 46

> Bottom <

15 14 13-12'.11

  • i 39 38 32 26 d

37 31 25

'0-36 30 24 19 1

35 29 23 18

- 34 28 22 17-

  • 33 27 21 16 '*:

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. Table 2 Smear samples '(smr) alternate-the same pattern as the direct readings in the tank.

Smears number #1 - #27.

Smears in the-upper section of the. tank are 10 per level on two levels.

---> West 17 1

2*

22 23 7

  • 16 25 21 27 8

3*

]

< Bottom >

20 26 9

4*

  • 15 24 19 18 10 14 6

5 o

Table 3 i,

1 L

Direct readings (drr) along the rim of the tank consist'of #1 -

l

  1. 18.

Measurements begin on the-north east' corner and number clockwise-around the tank.

  1. 17
  1. 16
  1. 15-
  1. 14

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---> West

  • #13
  1. 18*
  • - #12
  1. 1 *
  • #10
  1. 2
                                                                  • .#9..

>~#11

  1. 3
  1. 4
  1. 5-
  1. 6
  1. 7'
  1. 8 b.

s 2

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6 Table 1 Survey Report For Liner Removal Note:

Direct Readings on side walls of concrete 1 - minute counts Detector Serial # QP-38 Ludlum 2221 Serial #97843 Background 40 Counts Efficiency =.15 Probe Area = 15.2cm2' Location Gross NET DPM per DPM per DPM per Counts Counts Probe 100cm2 100cm2 fig

  1. 1 43 3

20 134 131 399

  1. 2 44 4

27 179 175 402

  1. 3 45 5

33 223 219 404

  1. 4 44 4

27 179 175 402

  1. 5 51 11 73 491 482 418
  1. 6 44 4

27-179 175 402

  1. 7 43 3

20 134 131 399

  1. 8 45 5

33 223 219

'404

  1. 9 42 2

13 89 88 397

  1. 10 36 0

0 0

0.

0

  1. 11 36 0

0 0

0 0

  1. 12 37 0

0 0

0 0

  1. 13 45 5

33 223 219 404

  1. 14 42 2

13 89 88 397.

  1. 15 38 0

0 0

0 0

  1. 16~

42 2

13 89 88 397

  1. 17 39 0.

0 0

0 0

  1. 18 41 1

7 45 44 1394

  1. 19-42 2-13 89 88 397
  1. 20 46' 6

40 268 263 406

  1. 21*

42-

~2 13 89 BB

-397 e

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m e

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  1. 22 41 1

7 45

'44

-394 0

  1. 23 39 0

0 0

0 0

a 1

.#24 45 5

33 223' 219 404.

-- 5 p.-

  1. 25 46 6

40 268 263 406 N

i

  1. 26 46-6 40 268.

263

~406-d

.[

  1. 27 44 4

27 179 175 402

'i 428 47 7

47

'313-307 409~

  1. 29 46 6

40 268 263 406

  1. 30 44 4

27 179_

175 402

  1. 31 42.

2 13 89 88 397

  1. 32 35 0

0 0

0'

.0l

]

  1. 33-45 5

33 223 219

'404

  1. 34 42 2-

'13 89 88

'397

- #35 39 0

0-0 0.

0
  1. 36 43 3

20 134-131~

399:

<t 5

  1. 37 45 5-33

'223

~219:

404

~

L

- #38.

46 6

.40 268-263-

.406 i

  1. 39 41 1

7 45 l4 4 '

-394 j

~;

'#40 40 0

0-0-

0 0

l

  1. 41 36 0

0

.0' 0-0

  1. 42 42

'2 13 89 88.

397.

  1. 43
35 0:

0-0-

0' 0

q

- #44 48

-8 53 357.

351 411 l

r

- #45

'45 5

33~

223 219

'404.

~

'{

  1. 46-44' 4-
27-179 175

~4 00

- #471

4.

2

.13-89 88=

~397 j

-#48 45;

.5-33-223-219.

.404 y

4-

- i

  1. 49 43-3

~20 134 131 399

  1. 50-

' 46 6

40 268 263-406:

l

  1. 51' 44 4

27 179 175

'402 l

  1. 52 43 3

20 134 131-399'

  1. 53 42'

'2 13 89:

88 397

  1. 54 48 8

53 357 351 411.

  1. 55 44 4

27 179 175

402-
  1. 56 45 5

33 223 219 404-l

  1. 57 47 7

47 312 307 409

j l
  1. 58 43 3

20 134 131 399

  1. 59 45 5

33 223 219 404-

  1. 60 43 3

20 134 131 399 a

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Li Table 2 1

Surtey Report For Liner Removal i

Note:

100 cm2 smears taken on concrete walls Count Time 5 min.

Background 4.85 counts LLD DPM 9.64 1

Location Gross Coutns Net Counts DPM per per min.

iper min.

100cm2 ilo

  1. 1 37 32.15 85.88 17'
  1. 2 15 10.15 27.01 12

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  1. 3 16 11.15 29.67 12 Ti
  1. 4 21.8 16.95 45.1 14 i
  1. 5 64.2 59.35 157.93 22 i
  1. 6 10.2 5.34 14.24 10
  1. 7 7.8 2.95 7.85 10 j
  1. 8 7

2.15

-5.72 9

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  1. 9 14 9.15 24.35 12
  1. 10 4.4.

-0.45

-1.20 8

la

  1. 11 234.4..

229.55 610.03 41

  1. 12 14 9.15

-24.35 12

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  1. 13 18.8 13.95 37.12' 13-1 I
  1. 14 18.6 13.75 36.59~

13'

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  1. 15 29.4 24.55 65.33 16

.#16 9.4 4.55 12.11 10-

[

  1. 17-11 6.15 16.37 11'
  1. 18 9.8 4.95 13.17

-10 '

l

  1. 19.

8.4' 3.55 9.45.

10

  1. 20 9;2 4.35 11.58 10

_=;

  1. 21 11.2 6.'3 5 '

16.9 11 i

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  1. 22-

-6.6

1.75 3.06 9

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  1. 23 7.6' 2.75 7.32 9

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  1. 24J 6

1.15 4.66

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  1. 25-19.60 14.75

. 39.25 L13

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  1. 26 7.8 2.95 7.85 10

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  1. 27-8 3.1.5 8.38 10' j

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Table'3 Survey Report For Liner Removal 1;'ote :

Direct Readings on' Top Rim of concrete 1 - minute counts Detector Serial # QP-38 Ludlum 2221' Serial #97843 Background 60 Counts Efficiency =. 15 Probe Area = 15.2cm2' Location Gross NET DPM per DPM per DPM per Counts Counts Probe 100cm2 100cm2 ilo.

  1. 1 64 4

27 175 175 488

  1. 2 87 27 180 1206 1183 531
  1. 3 70 10 66 446 438 500
  1. 4 74 14 93 625 614 507
  1. 5 81 21 140 938 920 520
  1. 6 107 47.

313 2099

'2060-566-

  1. 7 76 16 107 715 701 511
  1. 8 59 0

0 0-0 0'

  1. 9 80 20 133 893 877-519
  1. 10 90 30 200 1340 1315 537~
  1. 11 81 21 140 938 920 520-
  1. 12 87 27 180

-1206 1183 531

  1. 13 71 11 73 491 482 502
  1. 14 55 0

0 0

0 0

  1. 15 69 9-60 402 394 498
  1. 16 75 15 200 670-657 509 i
  1. 17-88 28 186 1251 1227 533
  1. 18 66 6

40 268 263 492 r

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