ML20003B142

Solid Waste Staging Facility,Sump Contaminant Rept

ML20003B142
Person / Time
Site:	Crane
Issue date:	02/02/1981
From:	Shelton T METROPOLITAN EDISON CO.
To:
Shared Package
ML20003B139	List: ML20003B138 ML20003B142
References
NUDOCS 8102100418
Download: ML20003B142 (17)

Text

O THREE MILE ISLAND NUCLEAR STATION UNIT 2 (TMI-II)

OPERATION LICENSE NO. DPR-73 DOCKET No. 50-320 SOLID 'n'ASTE STAGING FACILITY SUMP CONTAMINATION REPORT T. Shelton January 28, 1981 t$102100Ylf

1.0 INTRODUCTION

1.1 General Liners containing spent ion exchange media from the operation of EPICOR-I and EPICOR-11 are scored in an Interim Storage Facility (ISF), and in the Solid Radwaste Staging Facility (SWSF). The latter is provided with drains to a sump from which collected water can be pumped, monitored, and ultimately.

disposed of in an appropriate manner. Very low levels of radionuclide contamination have been found in this water.

This report presents findings to date from investigatione-of this contamination. In addition, until recently.

-EPICOR-I and EPICOR II liners were stored in the ISF.

Tritium contamination was found in two ISF storage locations af ter the liners that had been stored were transferred to the SWSF. All the contamination levels are considerable below 10CFR Part 20 limits for dis-charge to unrestricted areas. However, as the contamination is measurable and above back-ground levels, monitoring of the sump will continue.

1.2 Scope This report sets forth:

• Probable sources of water

• Analyticial results

• Conclusions

• Future activities

- :a; 2.0 PROBABLE SOURCES OF WATER SWSF 2.1 The sump liquid level has been monitored regularly since August of 1980. From that date through January 15, 1981,-the sump liquid level has increased 3 inches, which corresponds to-approximately 70 gallons. Total water in the sump on January 15, 1981, was about 150 gallons. Visual inspection of the sump.

l.

indicates that the major constituent of water inleakage to the sump is probably rainwater via a defective gasket in the sump I

access manhole. This was substantiated by covering the'A'and B storage. module drain inlets to the sump for several weeks with' plastic bags and observing the amounts of liquid collected.

i Periodic observation of water volumes in these bags indicated small anounts of water collected as a function of. time (on the order-of several mi per week) followed by. a. large volume collected (on the order of a gallon per ~ day). -This larger volume collected coincided with start up and test work related to check out of conductivity probes designed to l-detect the presence of water-in the -drain outlets, and

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negated the validity of any water collected and sample l

analyses were not performed.

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Examinntion of tha storaga modules hts indicetcd that c=all tmounts' of rainwater may be entering some storage cells (and therefore the sump) via faulty sealing between the shield plugs and gaskets, since nylon lif ting straps penetrate the sealing surface in all cells containing 6 x 6 liners or stacking platforms.

2.2 IST Liquid has been found in the bottom of a number of the cells of the ISF (cells 2 and 20). While no obvious pathway has been observed, it is postulated that the principal source of this water also is rain.

3.0 ANALYTICAL RESULTS 3.1 Data Several sets of analytical results are appended hereto:

• Table 3.1-1 SWSF su=p sample radioactive analysis results

• Table 3.1-2 SWSF sump sample and TMI environmental groundwater monitoring well sample chemical' analysis.

• Attachment 1 Teledyne radioactiva analysis results of water and sediment samples from areas near the SWSF.

• Attachment 4 Teledyne radioactive analysis results of SWSF sump water.

3.2 Discussion 3.2.1 SWSF Sunn Results of SWSF sump liquid sa=ples dating back to April 5,1980-(see Table 3.1-1) have been obtained and analyzed. Initial sump contamination was observed in a July 2, 1980, sample (Gross Beta-Gamma of 6.35 E-8 pCi/ml), and was subsequently verfied in a July 16,1980, sample. Tritium has been detected in samples since July 16, 1980, and has remained virtually constant at l

E-05pci/ml levels. Early in November 1980, a sump sam Je was l

sent off-site to SAI. Results of this analysis indica.ca the l

presence of cesium 137 (1.22 E-08pC1/ml). This presencR of l

cesium has not been verified via other sample results; however, other offsite samples to date have not been counted subsequent l

to sample liquid evaporation. Teledyne has been instructed to boil down the December 5, 1980 sample and analyze the residue.

Possible inleakage of groundwater l

The concentrations of radionuclides determined as shown in l

Attachment l' are not abnormal when compared to other groundwater and sediment present at the TMI site. Thus, there is no indi-l

. cation of leakage from the sump to groundwater. However, this subject will continue to be pursued as part of the ongoing-monitoring program as in Attachment 3.

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3.2.3 ISF Cells In addition to the analytical results attached hereto, analyses were made of samples of the water found in the ISF cells. The tritium content was found to be only 3.4 E-5pC1/mi in Cell No. 2 and 6.0 E-5pci/ml in Cell No. 20, while results from other cells from which samples were taken indicate no tritium present.

3.3.4 Comparision to Part 20 Important to consideration of the possible hazard related to the sump water contamination is the fact that the 10CFR Part 20. Appendix B, Table II, Column 2 limit for concen-tration of trituim in water discharged to unrestricted areas is 3x10-3, well over an order of magnitude higher than the sump water tritium content. Similarly the Part 20 limit for cesium-137 is 2x10-5 uci/ml, over two orders of magnitude above the sump water concentration.

4.0 CONCLUSION

S 4.1 Potential hazard The concentrations of both tritium and cesium-137 in the sump water are significantly below limits in 10CFR Part 20 for water to be discharged to unrestricted areas.

4.2 Source of water It is probable that the principal source of. water found in the sump is rainwater.

It is very unlikely that groundwater ic

~. ;l leaking into the sump.

4.3 Source of contamination It is known that air containing water vapor will escape through With treaded, plugged connections on the liners at some 2psig.

changes in temperature, the pressure in the liners will fluctu-ate, making " breathing" a likelihood. This could well be the source of the tritium found. Cesium could come from minor external contamination of the liners carried by water which entered the cell via the nylon lifting straps (Paragraph 2.1, above) and flowing over the liners to the drains and thence to the sump. To date, no conclusive data exist that confirms s

liner leakage. Neither does conclusive evidence exist that verifies containers not leaking. Based on information'to~date,

.it is our opinion that liner " breathing"-is the most probable-cause of this tritium contamination.

5.0 FUTURE ACTIVITIES 5.1 Water Inleakage 5.1.1 SWSF Sumo.

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4-In order to limit water inleakage directly into the su=p, the sump access manhole gasket will be replaced. Also, the manhole cover will be modified in such a manner so as to limit gasket damage when removing and replacing the manhole cover.

So that contamination sources may be more clearly defined, the A and B module drain inlets to the sump will remain in place and be periodically checked for water collection.

If a sufficient amount of water is collected from either drain, the contents will be analyzed and results forwarded to the NRC.

5.1.2 SWSF Modules As time permits, the nylon straps which penetrate the sealing surface between the shield plugs and gaskets will be modified to alleviate this water transport mode

• into the storage module cells.

5.2 Monitorine Procrams It is our position that direct leakage of liquid from stored liners can be detected by changes in su=p water chemistry and/or radionuclide content. Accordingly, base line information which has been and is being accu =ulated, can be used for comparision with any future data which might show a marked change in contamination. In support of this, a sampling program has been initiated to obtain periodic ens 1tc and offsite analysis of.the SWSF sump liquid.

This program will include radioisotopic and chemical analysis of the su=p liquid'(Attachment 2).

5.2.2 An environmental monitoring program has also been initiated to periodically sa=ple surface water and sediments in the south drainage ditch and water from excavation areas near the SWSF. Additionally, installation of monitoring wells in the SWSF area is currently being studied (Attachment 3).

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TABLE 3.1-1 SWSF SUMP SAMPLE RADIOACTIVE ANALYSIS RESULTS TRITIUM GROSS BETA-GAMMA GAMMA-SCAN SAMPLE NO.

DATE (mC/.I)

(AC/ml )

(n(i/ml)

COMMENTS 36790 4/5/80 LLD LLD 36791 4/5/80 LLD LLD 42443 6/12/80 LLD LLD LLD 43365 6/25/80 LLD 43366 6/25/80 LLD 44275 7/2/80 LLD 6.35E-08 44276 7/2/80 LLD 44935 7/9/80 LLD LLD LLD

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44936 7/10/80 LLD 45483 7/15/80 LLD 45484 7/15/80 LLD LLD 45619 7/16/80 7.75E-05 1.68E-07 LLD 46068 7/22/80 LLD 49144 9/8/80 1.34E-07 LLD 50243 9/29/80 5.4E-05 LLD 50244 9/29/80 e.2E-05

-LLD 51681 10/29/80 3.9E-05 1.2E-08 Gross 8 eta-(Cs-137) 1.4E-07 AG/mf sent to SAI-BOILED 52898 11/25/80 2.8E-05 LLD LLD-77121 12/5/80 2.6E-05 LLD TELEDYNE-NOT BOILED i

l The symbol "- " denotes no analysis of the designated type J

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TABLE 3.1-2 Sk'SF SUMP SAMPLE AND THI ENVIRONMENTAL GROUNDb'ATER MONITORING k' ELL SAMPLE CHEMICAL ANALYSIS ANALYSIS SWSF SUMP GROUNDWATER (RANGE) 7.93 6.47-9.91 ph CONDUCTIVITY umho/cm 960 TOTAL SOLIDS mg/l 562 1070 TOTAL DISSOLVED SOLIDS mg/l 555 TOTAL SUSPENDED SOLIDS mg/l 7

SULFATE mg/l 58 0.10-0.35 9*7 9-23 CHLORIDE mg/l 13.5 S 0 3.5-13.6 SILICA mg/l g2 TOTAL PHOSPHORUS mg/l 0.51PO -P 0.01-4.1 6 4

AKMONIA NITROGEN mg/l 3.63NH -N 3

NITRATE NITROGEN mg/l 16.0 NO -N 3

50.0 11-107 SODIUM mg/l 1.82 1.1-11 TOTAL IRON mg/l TOTAL CALCIUM mg/l 27.2 107-1070 7.3 11-107 TOTAL MAGNESIUM mg/l TOTAL ALUMINUti mg/l 0.1 11-107 0.50 0.11-1,1

- c; TOTAL ZINC mg/l

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Attachstnt 2 METROPOLITAN E D I S O N C O M P A N Y s.,,,, c.,,,.i,. v,,,,,,,, c,,,,,,,, TMI-II-R-47000 Long-Term Storage Modules (A & B) L'**d' TMI/U-2 Site Ops subject Sump - Sampling Program Date January 20, 1981 To B. D. Elam K. L. Harner Due to recent GPU and NRC concerns with respect to the Long-Tem Storage Modules (A & B) sump contamination and Epicor liner integrity, please initiate a sampling As a minimum, the sampling program should be program. in accordance with the following: Storage Module (A & B) Su=p; One

1. Liquid gallon Frequency Once per week On site Location Analysis Tritium, Ga=ma Scan, Gross Beta Ga=sa.

Then boil down sample and perfom another Gamma Scan and Gross Beta Gamma count on the resi-due. Storage Module (A & B) Su=p; One

2. Liquid gallon Once per month Frequency Off site (SAI)

Location Same as in'(1.) above. Analysis Storage Module (A & B) Sump; One

3. Liquid gallon Once per month Frequency Off site (SAI)

Location Chemical (per Attachment 1) ( Analysis Please -provide copies of the results for the above samples, as well as any other samples you deem neces-If sary, to J. Daniel and myself in a timely manner. l you have any questions concerning this program please i the undersigned at X-8329. feel free to contact r l i ?k - T. A. Shelton f TAS/jw attach. l J. J. Barton, J. A. Daniel, C. P. Deltete, J. I!ess CC: G. K. Hovey, File ~ INTER-OFFICE MEMORANDUM f

e.....

g g.,, y. @ e M G M O P E M ' J.1 Attschmint 3 1 -s r..c e 1 ann.iry 6, 1981 % hret THREE MILE ISLAND NUC1.EAI, STATION 1.1NER STORAGE MODULE ENVIKONMENTAL MONITORING To W. E. Riethle Location Hbg. Int'l Airport In response to recent concern expressed bf the NRC relative to potential environmental contamina' ion of ground and surface water originating f rom the t above ref erenced f acilities, the following steps have been initiated: 1. As of December 8,1980, sampling of surface water and sediments in the south drainage ditch was incorporated into the weekly groundwater monitoring program. Sampling locations are presented in Figure 1 (attached). Monitoring of the East Dike Catch Basin (EDCB) has been enforced on a,. 2. weekly basis since early November and will be continued as part of this monitoring regime. The EDCB serves as the monitoring point prior to intercept with the river. On a monthly basis, the " excavation pond" adjacent to the storage r.'odule 3. will also be sampled as water is available. The insta11atior df monitoring wells around the storage module is being 4. examined by Crc

/Uster Technology. Their iecor.cndations are due r o us by January 10,

<1. At this time the necessaty steps will be taken to implement Tec's. ecor.:nendations. Water and sediment samples obtained from this program will be sont to 5. Teledyne Isotopes for gamma scan analysis and tritium. This program will provide the necessary information relative to any environmental contamination of the water pathways f rom the storage modules. i O/i 1 i P G. G. Baker, Ph.D. t l GGB/ kit l Attachment cc: P. Deltete i R. I. Newman l M. B. Roche l T. J. Walsh File: 2249.2.3 D R/P D P DW n bG Jl h 1 ..Gfu Segce Corporationis a subsictary of Gie c:af Putic LM!es Co'ps.e'on n ~. ---.s..... "e w

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