ML20073L832
| ML20073L832 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 05/06/1991 |
| From: | Kovach T COMMONWEALTH EDISON CO. |
| To: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 9105140137 | |
| Download: ML20073L832 (8) | |
Text
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.4[ ^CMs 1400 Cammenw:alth Edison Opus Place
., ( Downers Grove, Illinois 60515 i
May 6,1991 Mr. A. Bert Davis Regional Administrator U. S. Nuclear Regulatory Commission Region lll 799 Roosevelt Road Glen Ellyn,IL 60137
Subject:
Braidwood Station Units 1 and 2 l Supplemental Response to inspection Report Nos. 50-456/90022 and 50-457/90024 NRC Docket Nos. 50-456 and 50-457
Reference:
(a) L. R. Greger Letter to C. Reed dated December 19,1990 (b) A. R. Checca Letter to A, B. Davis dated January 17,1991
Dear Mr. Davis:
Reference (a) provided the results of a NRC Inspection of the Radiological Environmental Monitoring Program (REMP) at Braidwood Station. During this inspection, a violation of NRC requirements relating to the reportability of tritium concentrations in environmental samples was identified. Reference (b) provided Braidwood Station's response to the violation, in this response Braidwood Station committed to a special sampling study of the tritium levels in the Kankakee River at low river flow, nearby shallow wells used by the public and Braidwood cooling lake water. The purpose of the letter is to outline this special study. Discussions with various company departments have led to the development of a comprehensive study of the Kankakee River. The study will be conducted for the period May through September,1991. All samples will be collected and analyzed for tritium on a weekly basis. The sample locations identified include some current REMP sample locations plus additional sampling points. The sample points are listed in
' Attachment A. The environmental contractor will prepare a special report on a monthly l basis detailing the results of the study. Upon completion of the study, the results will l be provided to the NRC.
l l l i , o r60! loc a 7g29:1 s/, 1
. Mr. A.B. Davis May 6,1991 At the request of the NRC inspector, the Kankakee River recirculation at times of low f!ow was reviewed. The Environmental Services Department conducted a study during the drought year of 1988. The results, included in Attachment B, tend to show that recirculation does not occur during low flow periods. To provide further verification of this, a dye study under low river flow conditions would be necessary, if low river flow occurs during the period of the specisi sampling program, a dye study will be conducted and the results included in the special study report.
If you have any questions concerning this special study, 'ontact K. Aleshire (x2726) at Braidwood Station. Respectfully, d 6 [t<,ws T.J.Kovach[r Nuclear Licensing Manager cc: S. DuPont, Sr. Resident inspector - Praidwood NRC Document Control Desk l 929:2
4 1 l ATTACHMENT A 1 Current Sample Points:
- 1. BD River Screen House (RSH), river water upstream of RSH.
- 2. GD8- Ir.take water
- 3. BD9- Discharge water
- 4. B D Downstream water sample
- 5. BD 25- Upstream control sampis,4 miles upstream of RSH New Sample Points:
- 1. Horse Creek at highway ll-113 - since the creek empties into the Kankakee River just upstream of the RSH, samples will confirm / disprove the creek as a source.
- 2. Well water - included at the request of tha NRC inspector.
Location Depth
- a. First house north 110 ft, closest to discharge
- b. Second house north 395 ft. deepest well c, Third house north 50 ft, shallow well
- d. Eighth house north 80 ft, typical well depth of homes in area
- 3. Custer Park Fire Department well- upstream of RSH
- 4. RSH Forebay - since the station does not make up continuously from the river, this point will confirm / disapprove any buildup of tritium which cocid be inadvertently taken into the stat on.
- 5. Freshwater holdup pond - the location where river water is pumped prior to it's entry into the Braidwood cooling lake.
- 6. Cooling lake water - collected at 2 (future) public access locations.
929:3
.- .. _ - - . . . . . . - _ - ~_ - . - - -. - _ . - - - . ._ - . - - - .
ATTACHMENT B The attached data sheets are from a study which was conducted by Commonwealth Edison Company's Corporate Environment Services Group and Braidwood Station personnel during the drought year of 1988. The study transect was located just below the river intake screenhouse. River velocity was measured at 20 foot increments from the east to the west shoreline. The study indicated that, as expected, velocity is greatest near the center point of the river and taaers off towards both shorelines. It should be noted that under the study conditions,11ere was generally more flow on the station side of the river than the opposite side. This study does not indicate that recirculation is occurring during low flow periods. Additional investigation would have to be conducted however in order to provide further verification of this observation. 029:4
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