ML20041D240
| ML20041D240 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 02/16/1982 |
| From: | Chesnut S Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8203040615 | |
| Download: ML20041D240 (5) | |
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Docket Nos.: STN 50-454
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2 and STN 50-455 APPLICANT:
Commonwealth Edison Company
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FACILITY:
Byron Station
SUBJECT:
SUMMARY
OF GE0 TECHNICAL REVIEW HEETING A neeting was held December 22,131 in Bethesda, Maryland with representatives from Commonwealth Edison Company, Sargent & Lundy, and Danes & Moore to discuss concerns in the geotechnical engineering review of the Byron FSAR. A list of attendees is given in Enclosure 1.
The applicant presented results of trenching and horings at the Byron site made as a result of discussions at the previous neeting held December 3,1981 concerning the design basis sink hole. The trench was dug in an area of a surface depression and revealed no evidence of inclined bedding.
Instead, the trenching revealed evidence of a series of four fracture lines. The four bnrings also indicated that this depression feature was formed by solutioning along fracture-junctions rather than cavity collapse. The applicant suggested that this feature should nore correctly be called a solution basin rather than a sink hole. The applicant indicated that Illinois State Geological Survey personnel also exanined the trench and concurred in the conclusion of the method of formation. The staff agreed that this argunent and supporting data seemed reasonable but asked to get a copy of the State Survey letter as an independent opinion. The applicant also presented data from three borings in Area #11, which was identified by the staff as the main area of concern. This data agreed with the conclusion from the other borir1s and trenching. The staff expressed its concern that insufficient data exists in this area of greatest potential for problens. The staff indicated that it may require additional borings and possibly a trench in this area to confirm the conclusion presented.
The applicant also discussed the groundwater levels given in FSAR Table 2.4-28.
They indicated that the first three entries were apparently in error and shnuld be disregarded. However, the staff was not satisfied with the explanation given for eliminating this data and requested further explanation.
or additional data to confirm the groundwater levels.
Stephen 11. Chesnut, Project Manager 8203040615 820216 Licensing Branch No. 1 PDR ADOCK 05000 Division of Licensing
Enclosure:
As stated
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STM 50 454 and STN 50-455 APPLICANT: Commonwealth Edison Company FACILITY:
Byron Station
SUBJECT:
SUtMARY OF GE0TECHHICAL REVIEW MEETING A meeting was held Decenber 22, 1981 in Bethesda, Mary)'and with representatives from Commonwealth Edison Company, Sargent & Lundy, and Dames & Moore to discuss concerns in the geotechnical engineering review of he Byron FSAft. A list of attendees is given in Enclosure 1.
The applicant presented results of trenching anp borings at the Byron site made as a result of discussions at the previous mee, ting held Decenher 3,1981 concerning the design basis sink hole. The trench was dug in an area of a surface depressiori and revealed no evidencefof inclined bedding.
Instead, the trenching revealed evidence of a series of The four borings also indicated that this depressi,o/four fracture lines.
n feature was fomed by solutioning alono fracture-junctions rather than cayity collapse. The applicant suggested that th'.s feature should more correctly be called a solution basin rather than a sink hole. The applicant indicated /that Illinois State Geological Survey personnel also examined the trench and concurred in the conclusion of the nethod of formation. The staff agreed that this argument and supporting data seemed reasonable hut asked to get a copy'of the State Survey letter as an independent opinion. The applicant also presented data from three borings in Area #11, which was identified by the staff as the main area of concern. This data agreed with the conclusion from the other borings and trenching. The staff expressed its concern that insufficient' data exists in this area of greatest potential for problems. The staff int ii l borings and possibly a trench in this a)icated that it will require add t ona rea to confirm the conclusion presented.
The applicant also discus / sed the croundwater levels given in FSAR Table 2.4-28.
They indicated /that the first three entries were apparently in error and should be disregarjied. However, the staff was not satisfied with the explanation given for/ eliminating this data and requested further explanation.
Thisremainsanare[ofdisagreement.
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Steve Chesnut, Project Manager Licensing Branch Ho. 1 Division of Licensing
Enclosure:
As stated 1
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e Mr. Louis 0. De1 George Driector of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690 cc: Mr. William Kortier Mr. James G. Keppler Atomic Power Distribution U. S. NRC, Region III Westinghouse Electric Corpcration 799 Roosevelt Road Post Office Box 355 Glen Ellyn, Illinois. 60137 Pittsburgh, Pennsylavania 15230 Paul M. Murphy, Esq.
Isham, Lincoln & Beale One First National Plaza 42nd Floor Chicago, Illinois 60603 Mrs. Phillip B. Johnson 1907 Stratford Lane Rockford, Illinois 61107 Ms. Bridget Little Rorem Appleseed Coordinator 117 North Linden Street Essex, Illinois 60935 Dr. Bruce von Zellen Department of Biological Sciences Northern Illinois University DeKalb, Illinois 61107 Mr. Edward R.~ Crass Nuclear Safeguards and Licensing Division Sargent & Lundy Engineers 55 East Monroe Street Chicago, Illinois 60603 Myron Cherry, Esq.
Cherry & Flynn Suite 3700 Three First National Plaza Chicago, Illinois 60602 Mr. William Fourney U. S. Nuclear Regulatory Commission Byron / Resident Inspectors Office 4448 German Church Road Byron, Illinois 61010 Ms. Diane Chavez 602 Oak Street, Apt. #4 Rockford, Illinois 61108
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..,e Enclosure l
Geotechnical Review Meeting December 22, 1981 Attendees NRC J. Youngblood S. Chesnut
.K. Kiper J. Chen L. Heller I. Alterman S. Brocoum R. Jackson Commonwealth Edison Company T. Tramm K. Ainger Sargent & Lundy L. Holish A. Yonk
- 0. Zaben N. Netzel Dames & Moore C. Kunz M. Kiefer
MEETING
SUMMARY
DISTRIBUTION
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TIC /NSIC/ Tera FEB 161982 V. Benaroya Z. Rosztoczy e
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B. J. Youngblood A. Schwencer F. Congel fix
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G. Lainas W. Butler R. Vollmer J. P. Knight R. Houston R. Bosnak F. Schauer L. Rubenstein R. E. Jackson T. Speis Project Manager KKiper/SChesnut M. Srinivasan Attorney, OELD J. Stolz M. Rushbrook S. Hanauer OIE (3)
W. Gammill ACRS (16)
W. Minners F. Schroeder E. Adensam D. Skovholt M. Ernst NRC
Participants:
L. Hulman C. Berlinger JYoungblood K. Kniel SChesnut G. Knighton KKiper A. Thadani JChen LHeller J, Kramer IAlterman SBrocoua RJackson D. Ziemann bcc: Ap,nlicant & Service List