Text

Submits First Groundwater Monitoring Rept Presenting Results of Program to Detect Radioactive Water Leakage
	ML20053D131
Person / Time
Site:	Crane
Issue date:	05/27/1982
From:	J. J. Barton; GENERAL PUBLIC UTILITIES CORP.
To:	Barrett L; Office of Nuclear Reactor Regulation
References
	4400-82-M-0078, 4400-82-M-78, NUDOCS 8206040111
	Download: ML20053D131 (55)
	v • d • e

o GPU Nuclear gg gp P.O. Box 480 Middletown, Pennsylvania 17057 717-944-7621 Writer's Direct Dial Number:

G M

May 27,1982 g

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i=c 4400-82-M-0078 M

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k o-s TMI Program Office

.g SEy Attn:

Mr. L. H. Barrett, Deputy Program Director W

US Nuclear Regulatory Commission C/0 Three Mile Island Nuclear Station to E

Middictown, PA 17057

Dear Sir:

Three Mile Island Nuclear Station, Unit 2 (TMI-2)

Operating License No. DPR-73 Docket No. 50-320 Accident Generated Water Monitoring Program This is the first periodic report presenting results of the program to detect radioactive water leakage to the ground water of TMI-2.

This information was previously submitted to you via the " Containment Integrity Assessment Program" reports; however, as the inventory of accident generated water has decreased within the containment building, the thrust of our ground water analysis and this report is aimed at accident generated water in general.

As a result of the increase in ground water tritium concentrations first noted in the vicinity of the Borated Water Storage Tank (BWST) on the February 1,1982, sampling date, we have formed an Accident Generated Water Monitoring Working Group. Tnis group met with on-site NRC personnel on April 15, 1982, and again on May 4, 1982. Therefore, most of the data presented herein has already been communicated to you.

This report is merely intended to serve as "hard copy".

Based on this information and radiation readings taken on the drums of contaminated soil removed from the area of the January 13, 1982, BWST pipe leak, it has been calculated that approximately 2,500 gallons of BWST water leaked onto the ground. This leak is considered to be the primary cause of the increased tritium concentrations in the ground water and the BWST Pipe Chase und the Air Intake Tunnel Sump. However, efforts are continuing to determine if there are other contributors to the tritium concentrations in the ground water.

9 naeum'ay's di R

GPU Nuclear is a part of the General Public Utihties System

r Mr. L. H. Barrett 4400-82-L-0078 Ground Water Monitoring The following ground water data is attached:

1.

Individual computer graphs (Figure 1) of tritium concentrations for each monitoring station and the East Dike Catch Basin (EDCB) up to and including March 2, 1982. NOTE: The tritium graphs have been changed to use a logarithmically scaled ordinate to facilitate plotting of the higher concentrations seen in some of the samples. Also, during the month of February, 1982, numerous samples were taken from MW-1, MW-2, MW-3, OW-10, 0W-10, OW-16, and OW-17.

The tritium concentrations reported in Figure 1 of the February 1, 1982, date are the averages of these samples. We are working on changing the computer table and plotting format for future reports to include all the sample results. In the meantime, we are forwarding Table 1 of this report.

2.

A table (Table 1) indicating tritium concentrations in the February, March, and April samples received to date. Some of these concentrations may change as further confirmatory analysis results are reported.

3.

Individual computer graphs (Figure 2) indicatirg water levels within the monitoring stations up to and including April 5, 1982.

4.

Computer tables (Tables 2 and 3) of gamma scan data up to and including February 1,1982. Analysis of MW-1, MW-3, MW-4, MW-5, MW-6, MW-7, and MW-8 samples for March 2, 1982, have reported normal concentrations.

5.

A graph (Figure 3) indicating gamma scan data from Monitoring Station MW-2 sample analysis.

6.

A table (Table 4) of strontium 89 and 90 analysis results for fourth quarter 1981 samples taken from the monitoring stations and the EDCB.

7.

A composite drawing showing all monitoring locations with a graph of the tritium concentrations reported in each station.

Tritium concentrations within the monitoring stations near the BWST remain elevated.

Gamma results for the well samples taken on February 1, 1982, were all less than the laboratory's lower limit of detection (LLD).

s Mr. L. H. Berrett 4400-82-L-0078 Strontium 89 and 90 analyses are reported on Table 5.

All of the samples were reported as having strontium concentrations which are less than LLD.

Initial analysia of the sample from monitoring station OW-17 indicated a Sr 89 concentration of.925 i.47 pci/1. In addition, a sample from OW-14 was analyzed and a Sr 90 concentration of.569 i pei/l was reported. Both of these samples were re-analyzed and reported as having strontium concentrations of less than LLD.

Cork Seal, Tendon Access Gallery, and Containment Outer Wall Radiation Monitoring Continued surveillance of these areas has not indicated any water leakage from the Reactor Building.

Reactor Building Sump Water Level Figure 4 presents sump level data for the period of January 1,1980, through May 12, 1982. The significant decrease in sump level which occurred from April 19, 1982, to May 1, 1982, was due to pumpout of the last few inches of building water. The water level in the building is presently below the accurate range of the installed bubbler system.. Visual inspection of the 282' 6" level of the Reactor Building on May 13, 1982, indicated that there was little or nor free standing water on this level of the Reactor Building.

Additional Activities As previously discussed with you, we are presently evaluating how to provide a more accurate BWST level indication to more adequately monitor for BWST leakage. Additionally, we have taken a soil sample in the vicinity of OW-16 to provide additional information on the amount of tritium in the soil at TMI. The results of this sample will be provided in the subsequent report.

Si

rely,

.J arton ing Director, TMI-2 JJB/JJB/jep Attachments CC:

Dr. B. J. Snyder, Program Director, TMI Program Office

9 LIST OF ATTACHMENTS FIGURES Figure 1 Graphs of Tritium Concentrations of Monitoring Stations and East Dike Catch Basin Samples versus Time Figure 2 Graphs of Water Levels in Monitoring Stations versus Time Figure 3 Gamma Scan Results for Monitoring Station MW-2 versus Time Figure 4 TMI Unit II Reactor Building Sump Level TABLES Table 1 Tritium Concentrations of Monitoring Station Samples taken during February March, and April 1982 Table 2 Cesium-137 Concentrations in Monitoring Stations HW-1 to MW-8 Table 3 Cesium-134 Concentrations in Monitoring Stations MW-1 to MW-8 l

Table 4 Groundwater Stontium - 89/-90 Results: 4th Quarter 1981 l

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e, FEBRUART 1982 CROUNDWATER RE'SULTS*

Well Date Tritium Concentration (pCi/1)

E'.J-1 February 1

<157A February 10 350170 February 11 310180 MW-2 February 1 232000123000 February 9 849000185000 Fdbruary 10 929000193000 February 11

.740000174000 February 12 954000195400 Februa'ry 16 919000191900 February 18 822000182200 February 23 503000150000

. February 25 285000129000 MW-3 February 1 52211086 February 11 29301270 l

MW-4 February 1 10501130A February 11 15701160 MW-5 February 1 5531120A February 11 7101120 3991120A MW-6 February 1 February 11 520180 MW-7 February 1 7141120A February 11 1030190 MW-8 February 1 71911205 February 11 930t80

Results Available to Date (April 5,1982)

ARMC l

l l

l Table 1 Page 1

February 1982 Groundwater Results Well Date Tritium Concentration (pCi/1) 0W-10 February 1 691 + 92 February 9 870 1 70 February 10 1280 1 150 February 11 968 + 120 February 12 1890 + 120 February 16 1750 + 110 February 18 1780 + 110 February 23 1410 + 160 OW-13 B February 1 945 + 130 February 10 1060 + 140 February 11 919 + 120 OW-14 February 1 748 + 130 February 11 184 + 110 OW-16 February 1 19300 + 1900 February 9 13800 ]F 2300 February 10 35800 + 3600 February 11 63000 1 6400 February 12 65900 + 6600 February 16

.111000 + 11000 February 18 156000 1 16000 February 25 176000 + 18000 OW-17 February 1 2044 + 200 February 9 12400 + 2200 February 10 107000 1 11000 l

February 11 182000 2 18000 February 12 243000 1 24000 February 16 300000 1 30000 February 18 678000 1 68000 February 23 504000 1 50000 February 25 678000 1 68000 TABLE 1, PAGE 2

I MARCH 1982 GROWDWATER RESULTS*

Well Date Tritium roucentration (pCi/1) 0 MW-1 March 2

<189 March 8 280 70 March 23 110260 0

MW-2 March 2 267,000126,700 March 8 180,000118.000 March 16 46,90014,700 h rch 23 30,9002 3,100 0

MW-3 March 2 62002620 March 8 25002170 March 23 24,70011500 A

MW-4 March 2 7441130 A

MW-5 March 2 7052130 h6 March 2 5491130

.A MW-7 March 2 4881130 a

t MW-8 March 2 6551130 l

Results Available to Date ARMC Table 1, Page 3

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t-e MARCH 1982GROUNDVATERREShLT3(CONT'D)*

r We'll

('

Date

/

i i>

~-

Trititra Concentrati.n (pCi/1) 50W-10 March 2 109021400 March 8 12301100

'3 March 23 12602100

!OW-13B March 2 A

4781130 OW-14 March:2 A

8692130 OW-16 March 2 0

362.000236,000 March 8 148,000215.000 j

March 16 173,000217,000 i

March 23 218.000222.000 l/

OW-17 March 2 724000_+72,0006 March 8 March 16 705,000271,000 441,000:44,000 March 23 1,100,0001110,000 EDCB March 2 7422130A March 9

~/

17801130 March 16 12402100 March 23 9001100 t

't it C.4sults Available to Date J

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April 1982 Groundwater Results*

Well Date Tritium Concentration (pCi/1)

MW-1 April 5 Not Available April 8 No Sample April 13 No Sample April 20 LLD (TMI)

April 26 LLD (TMI)

April 30 No Sample MW-2 April 5 50000 (TMI)

April 8 38000 (TMI)

April 13 26900 1 8070 April 20 44000 1 2640 (TMI)

April 26 55800 1 5600 April 30 No Sample MW-3 April 5 19000 (TMI)

April 8 20000 (TMI)

April 13 21900 1 7520 April 20 17000 1 1700 April 26 19000 1 1881 April 30 No Sample MW-4 April 5 847 110 MW-5 April 5 635 i 100 MW-6 April 5 393 1 100 l

MW-7 April 5 329 1 99 MW-8 April 5 1030 1 110 OW-10 April 5 34000 (TMI)

April 8 No Sample l

April 13 69400 1 11700 April 20 10900 1 4890 April 26 8100 1 1530 (TMI)

April 30 No Sample l

OW-13 April 5 806 110 OW-14 April 5 660 100 OW-16 April 5 566000 1 57000 April 8 No Sample April 13 608000 1 60800 April 20 400000 (TMI)

TABLE 1, PAGE 5

April 1982 Groundwater Results*

Cont'd.

Well Date Tritium Concentration (pCi/e)

OW ' '

April 26 570000 1 21660 April 30 670000 1 12060 OW-17 April 5 620000 (TMI)

April 8 610000 (IMI)

April 13 824000 1 82400 April 26 620000 1 62000 April 30 600000 1 10200

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ML20053D131

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