ML19329B764
| ML19329B764 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 12/10/1976 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| 166, NUDOCS 8002060783 | |
| Download: ML19329B764 (4) | |
Text
~ NRC enRu 195 U.C. NUCLEAR REGULATORY COMMISSION DOCKET NUMIE r
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er. si 50-346 NRC DISTRIBUTION con PART 50 DOCKET MATERIAL l
TO:
G.W. KNIGHTON FROM: TOLHBO EDISON DATE OF DOCUMENT TOLDEO, OHI 12-10-76 L.E. ROE DATE RECEIVEO 12-13-76 i
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ENCL,SURE DESCRIPTION LTR. RE. THEIR 9-10-76 MEETING.....TRANS THE PROPOSED STUDY TO COMPARE DAY AND NIGHT FOLLOWING......
ICHTHYOPLANKTON CONCENTRATIONS.....
( l SIGNED CY. RECEIVED)
( 3 pages)
DO NOT REMOVE ACKNOWLEDGED f
PLANT NAME: DAVIS BESSE I
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SAFETY FOR ACTION /INFORMATION v' JT"n nAR I N 14-7/i ASSIGNED AD:
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-e December 10, 1976 g/
..%O Serial No. 166
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,'b Director of Nuclear Regulation M
Attn:
Mr. George W. Knighton, Chief h
C13 lOZ3) 2 Environmental Projects Branch No. 1
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Dear Mr. Knighton:
During our September 10, 1976 meeting with the Staff in your Rockville offices, regarding the Davis-Besse Nuclear Power Station Unit 1 Environ-mental Technical Specifications, there was considerable discussion between Toledo Edison and the Staff over the necessity of incorporating nighttime ichthyoplankton sampling into our operational aquatic monitoring program. The result of this discussion, as reflected in Item No. 5 of your meeting notes dated October 8, 1976, was that we agreed to submitting a limited special study to compare day and nighttime ichthyoplankton sampling.
We are submitting herewith an Attachment I to this letter our Proposed Study to Compare Day and Night Ichthyoplankton Concentrations at the Davis-Besse Nuclear Power Station. We feel that this study will satisfy the commitment we made at our September 10, 1976 meeting.
If you should have any questions concerning this proposed study do not hesitate to contact me or any of my staff.
Yours very truly,
- b. 3'.kh Attcchment bt d/1 THE TC,LEGO EDISON COMPANY EDISCN PLAZA 300 MACISDN AVENUE TOLEDO. CHIO 43652
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m ATTACHMENT 1 i
PROPOSED STUDY TO COMPARE DAY AND NIGHT ICHTHYOPLANKTON CONCENTRATIONS AT THE DAVIS-BESSE NUCLEAR POWER STATION Objectives The objective of this study is to determine if there are any significant differences between day and night ichthyoplankton concentrations, in Lake Erie, in the vicinity of the Davis-Besse Nuclear Power Station site.
Monitoring This study shall consist of two ichthyoplankton sampling efforts con-ducted ten days apart or as soon as possible thereafter if weather does not permit sampling at exactly a ten day interval during the month of June, 1977, the anticipated period of peak larval density. Each sam-pling effort shall consist of two sets of ichthyoplankton samples, one collected at least four hours before sunset and the other collected at least four hours after sunset.
Each set of samples shall consist of duplicate surface and bottom sam-ples collected in the vicinity of the intake crib (Station 8), the area of the thermal plume (Station 13) and two control stations (Station 3 and 29) west and east of the site. These stations are those shown in Figure 3.1-1 of our proposed Davis-Besse Nuclear Power Station, Unit No. 1 Environmental Technical Specifications.
Samples shall be collected by five minute circular tows (3 to 4 knots /hr) at the surface and bottom, using a 0.75 meter diameter oceanography plankton net (No. 00, 0.75mm mesh). Ichthyoplankton shall be counted and identified to the lowest taxonomic level possible.
After collection of this data it shall be statistically analyzed to determine if there is'any significant variance between daytime and nighttime ichthyoplankton concentrations in the vicinity of the site.
Bases In the course of reviewing the proposed Environmental Technical Specifi.
cations (ETS) for the Davis-Besse Nuclear Power Station. Unit No. I the Staff has expressed a concern that nighttime sampling of ichthyoplankton was necessary. This concern was discussed with the Staff at some length during'a meeting between the Toledo Edison Company and NRC Staff in the NRC's Rockville offices, September 10, 1976. At this meeting the Staff stated that based on the research of Dr. Richard Cole of the University of Michigan, in Lake Erie in the vicinity of Monroe, Michigan, that they felt that night ichthyoplankton sampling was necessary. Toledo Edison agreed that there could possibly be some differences between day and night ichthyoplankton concentrations due to:
1.
Ichthyoplankton move-ment at night from the bottom to the surface and, 2.
Net avoidance
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9 during daytime sampling. However, Toledo Edison stated that they did
' not believe these factors would cause a significant difference between day and night ichthyoplankton samples collected at the Davis-Besse site.
The basis for this statement was:
1.
Ichthyoplankton samples are being collected at the surface and bottom to eliminate vertical variability, 2.
Net avoidance is not significant in the turbid waters found along the southern shore of western Lake Erie. Daytime ichthyoplanktou mon-itoring conducted by the Ohio State University, Center for Lake Erie Area Research in the vicinity of Maumee Bay and along the southern shore of Lake Erie, using the same sanyling techniques proposed in the Davis-Besse ETS, have yielded ichthyoplankton concentrations comparable to Dr. Cole's nighttime sampling.
The above sampling program is proposed to confirm Toledo Edison's contention that daytime sampling is adequate to characterize the ichthyoplankton concentrations in the vicinity of the Davis-Besse site.
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