ML20127E445
| ML20127E445 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/19/1985 |
| From: | Standerfer F GENERAL PUBLIC UTILITIES CORP. |
| To: | Travers W Office of Nuclear Reactor Regulation |
| References | |
| 0275A, 275A, 4410-85-L-0134, 4410-85-L-134, NUDOCS 8506240550 | |
| Download: ML20127E445 (39) | |
Text
Nuclear L"su"it';fner""
Route 441 South Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
(717) 948-8461 4410-85-L-0134 Doctznent ID 0275A June 19,1985 h
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TMI Program Office Attn: Dr. W. D. Travers
@F Deputy Program Director R
US Nuclear Regulatory Commission L:
c/o Three Mile Island Nuclear Station Middletown, PA 17057
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Dear Dr. Travers:
Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 Groundwater Monitoring The following is a periodic report of the results of the groundwater monitoring program which is conducted to detect the leakage of radioactive water to the groundwater in the vicinty of TMI-2.
GROUNDWATER MONITORING The following groundwater monitoring data is attached:
1.
Individual computer graphs (Figure 1) of tritium concentrations for monitoring stations, observation stations, and the East Dike Catch Basin (EDCB) up to and including March 5, 1985.
I Observation station 05-15 provided no data during the sampling period due to a low water level in the station.
2.
Individual computer graphs (Figure 2) of the water levels within the monitoring stations.
i 3.
A graph (Figure 3) indicating the gamma scan data from monitoring station MS-2 sample analyses up to and including 1
March 5, 1985.
b()h 8506240550 850430
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PDR ADOCK 05000320 R
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GPU Nuclear Corporation is a subsidlary of the General Public Utilities Corporation
Dr. W. D. Travers June 19,1985 4410-85-L-0134 4.
A composite drawing which depicts all monitoring locations with a corresponding graph of the tritium concentrations reported for each station.
5.
A table of tritium concentrations from weekly sampling of stations 05-17, 05-16, and MS-2 for the month of April 1985.
Tritium concentrations in most of the stations remained fairly constant.
However, a slight increase in the tritium concentrations occurred in stations OS-17, OS-16, and MS-2 over the sampling period. The cause of the increase was traced to a leaking valve (DH-V134A) located on a common line from the Borated Water Storage Tank (BWST) and the Sodium Hydroxide Tank. A Unit Work Instruction (UWI), No. 4220-3212-85-E777, has been submitted to the Maintenance Department to correct the problem and is currently in the planning stage. Weekly sampling of stations 0S-17, 05-16, and MS-2 indicate that the tritium concentrations remained fairly constant during the month of April 1985. The weekly sampling will be continued until the above noted problem is resolved. Table 1 lists the results of the weekly sampling for the month of April. The leak posed no significant threat to the health and safety of the public or site personnel.
Gamma results for the January 7,1985, samples were all LLD.
February 11, 1985, gamma results show only naturally-occurring K-40 present in MS-2 (73.5 + 33.9 pCi/1), OS-138 (83.9 + 33.7 pCi/1),
0S-16 (73.2 1 31.7 pC171) and 0S-17 (67.4 1 33.5 pCi/1). March 5, 1985, gamma results show only naturally-occurring K-40 in samples from MS-2 (200 1 51 pCi/1), MS-4 (156 1 53 pCi/1), MS-5 (69.5 1 34.9 pCi/1),
and OS-138 (74.1 1 23.5 pCi/1). All other radionuclide concentrations were reported as LLD for each of the above sampling dates.
Sr-89 and Sr-90 results for first quarter of 1985 were LLD for all samples.
Based on the data collected and analyzed to date, no significant radiological safety or health concerns exist relative to the groundwater in the vicinity of TMI-2 at this time.
Sincerely, M) UL4 k' AW \\
Q.
F. R. Standerfer Vice President / Director, TMI-2 FRS/CJ)/eml Attachments cc: Program Director - TMI Program Office, Dr. B. J. Snyder
ATTACINENT (4410-85-L-0134)
LIST OF ATTACHMENTS Figure 1 Graphs of Tritium Concentrations of Monitoring Stations and East Dike Catch Basin (EDCB) Samples Versus Time (15 pages)
Figure 2 Graphs of Water Levels in Monitoring Stations Versus Time (15 pages)
Figure 3 Gamma Scan Results for Monitoring Station MS-2 Versus Time (5 pages)
Drawing 1 Groundwater Tritium Concentrations at Site Liquid Monitoring Systems Table 1 Tritium Concentration from Weekly Sampling of Monitoring Stations 05-17, 0S-16, and MS-2 for the Month of April 1985 1
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TABLE 1 Tritium Concentrations (pCi/1)*
Station Date of Sample MS-2 05-16 05-17 04/02/85
<4100
+
19000 + 25001 22000{28002 04/09/85 26000 + 2900 6
0 04/15/85
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<4400 14000 + 2400 21000 + 2600 04/30/85 4800 + 1900 15000 + 2400 19000 + 2600
- Unit 2 Chemistry Results 1 - 1st analysis 2 - 2nd analysis a - small sample volume o* '- no sample taken
+ - only sufficient sample for environmental laboratory k