ML20138G133
| ML20138G133 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 10/16/1996 |
| From: | Hopkins J NRC (Affiliation Not Assigned) |
| To: | Myers L CENTERIOR ENERGY |
| References | |
| NUDOCS 9610180252 | |
| Download: ML20138G133 (4) | |
Text
-
October 16, 1996 Distribution w/ encl:
Docket File OGC PUBLIC RRothman 4
PD3-3 Reading GBagchi i
ACRS JRoe JCaldwell, RIII RPichumani Mr. Lew W. Myers GGrant, RIII EAdensam (EGA1)
Vice President Nuclear - Perry GMarcus Centerior Service Company P. O. Box 97, A200 Perry, OH 44081
SUBJECT:
REQUEST FOR INFORMATION - POROUS CONCRETE SUB-FOUNDATION, PERRY NUCLEAR POWER PLANT, UNIT N0. 1
Dear Mr. Myers:
The NRC has been investigating the reported erosion of cement from under the containment foundation basemat of Millstone 3.
The Millstone Unit 3 containment foundation basemat is supported on rock; however, between the rock surface and the underside of the structural concrete basemat there are several layers of material, one of which is.a 9-inch thick porous concrete layer consisting of coarse stone aggregates and high altmina cement.
Six inch diameter porous concrete pipes are installed in this porous concrete layer to collect and drain ground water which may seep down along the periphery of the containment wall.. The collected water drains into two sumps inside the Engineered Safety Features building.
Cement slurry has been observed in these sumps.
Based on our review of the information provided to us so far, there is no immediate safety concern because the amount of cement estimated to have possibly eroded since the plant was built in 1975 is only a small fraction of the total cement weight of the porous concrete, and because no adverse consequences of the cement erosion are either predicted or have been observed at Millstone 3.
With regards to any generic implication of this issue on other containment foundations with similar design, the staff has identified additional plan *s for which it requires more detailed information, including the Perry plant.
Please respond to the enclosed request for information (RFI) within 14 days of receiving this letter.
Sincerely, Original signed by:
Jon B. Hopkins, Sr. Project Manager Project Directorate III-3 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation bocketNo.50-440
Enclosure:
RFI cc w/ encl:
See next page b\\
DOCUMENT NAME:
G:\\ PERRY \\ CONCRETE.RAI To receive a copy of this document, indicate in the box:
[
- C' = Copy without enclosures *E' = Copy with enclosures "N* = No copy
\\
OFFICE PD33-LA l (E PD33-PM l6 NAME DFoster-Cur, teen JHorkins
////
DATE 10/lh/96 olPC 10//6/96 /f/
9610180252 9 1016 PDR ADOCK 05000440 p
e
.T l
October 16, 1996 l
Distribution w/ encl:
Docket File OGC PUBLIC RRothman PD3-3 Reading GBagchi ACRS JRoe JCaldwell, RIII RPichumani Mr. Lew W. Myers GGrant, RIII EAdensam (EGAl)
Vice President Nuclear - Perry GMarcus Centerior Service Company P. O. Box 97, A200 Perry, OH 44081
SUBJECT:
REQUEST FOR INFORMATION - POROUS CONCRETE SUB-FOUNDATION, PERRY NUCLEAR POWER PLANT, UNIT NO. 1
Dear Mr. Myers:
The NRC has been investigating the reported erosion of cement from under the containment foundation basemat of Millstone 3.
The Millstone Unit 3 containment foundation basemat is supported on rock; however, between the rock surface and the underside of the structural concrete basemat there are several layers of material, one of which is a 9-inch thick porous concrete layer consisting of coarse stone aggregates and high alumina cement.
Six inch diameter porous concrete pipes are installed in this porous concrete layer to collect and drain ground water which may seep down along the periphery of the containment wall.
The collected water drains into two sumps inside the Engineered Safety Features building.
Cement slurry has been observed in these sumps.
Based on our review of the information provided to us so far, there is no immediate safety concern because the amount of cement estimated to have possibly eroded since the plant was built in 1975 is only a small fraction of the total cement weight of the porous concrete, and because no adverse consequences of the cement erosion are either predicted or have been observed at Millstone 3.
With regards to any generic implication of this issue on other containment foundations with similar design, the staff has identified additional plants for which it requires more detailed information, including I
the Perry plant.
Please respond to the enclosed request for information (RFI) within 14 days of receiving this letter.
Sincerely, Original signed by:
Jon B. Hopkins, Sr. Project Manager Project Directorate III-3 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation bocketNo.50-440
Enclosure:
RFI cc w/ encl:
See next page DOCUMENT NAME:
G:\\ PERRY \\ CONCRETE.RAI To receive a copy of this document, indicate in the box:
"C" = Copy without enclosures *E" = Copy with em:fosures "N" = No copy 0FFICE PD33-LA l6 PD33-PM l6 NAME DFoster-Curgen JHopkins 4//
DATE 10/Jh/96 gk 4 10//6/96 g/
OFFICIAL RECORD COPY
. ~. -
i Mr. Donald C. Shelton Perry Nuclear Power Plant Centerior Service Company Unit Nos. 1 and 2 cc:
Mr. James W. Harris, Director Jay E. Silberg, Esq.
Division of Power Generation Shaw, Pittman, Potts & Trowbridge Ohio Dept. of Industrial Relations 2300 N Street, N. W.
P.O. Box 825 Washington, D. C.
20037 Columbus, Ohio 43216 Ms. Mary E. O'Reilly The Honorable Lawrence Logan Centerior Energy Corporation Mayor, Village of Perry 300 Madison Avenue 4203 Harper Street Toledo, Ohio 43652 Perry, Ohio 44081 Resident Inspector's Office The Honorable Robert V. Orosz U. S. Nuclear Regulatory Commission Mayor, Village of North Perry Parmly at Center Road North Perry Village Hall Perry, Ohio 44081 4778 Lockwood.oad Regional Administrator, Region III U. S. Nuclear Regulatory Commission Attorney General 801 Warrenville Road Department of Attorney General Lisle, Illinois 60532-4531 30 East Broad Street Columbus, Ohio 43216 Lake County Prosecutor Lake County Administration Bldg.
Radiological Health Program 105 Main Street Ohio Department of Health Painesville, Ohio 44077 P.O. Box 118 Columbus, Ohio 43266-0118 Ms. Sue Hiatt OCRE Interim Representative Ohio Environmental Protection 8275 Munson Agency Mentor, Ohio 44060 DERR--Compliance Unit i
ATTN: Mr. Zack A. Clayton Terry J. Lodge, Esq.
P.O. Box 1049 618 N. Michigan Street, Suite 105 Columbus, Ohio 43266-0149 Toledo, Ohio 43624 Mr. Thomas Haas, Chairman Ashtabula County Prosecutor Perry Township Board of Trustees 25 West Jefferson Street 3750 Center Rd., Box 65 Jefferson, Ohio 44047 Perry, Ohio 44081 Mr. James D. Kloosterman State of Ohio Regulatory Affairs Manager Public Utilities Commission Cleveland Electric Illuminating East Broad Street Company Columbus, Ohio 43266-0573 Perry Nuclear Power Plant P. O. Boy 97, E-210 Mr. Richard D. Brandt, Plant Manager Perry, Ohio 44081 Cleveland Electric Illuminating Company Mr. James R. Williams Perry Nuclear Power Plant Chief of Staff P.O. Box 97, SB306 Ohio Emergency Management Agency Perry, Ohio 44081 2855 West Dublin Granville Road Columbus,. Ohio 43235-2206
RE0 VEST FOR INFORMATION PERRY NVCLEAR POWER PLANT CEMENT EROSION UNDER CONTAINMENT FOUNDATION Your plant appears to have a porous concrete layer below the containment i
basemat.
1.
Have you found slurry in the drainage from this layer?
2.
Has there been any settlement of the containment basemat?
3.
Have you noticed any unusual conditions which may be related to the porous concrete sub-foundation layer?
4.
Are you monitoring anything related to the drainage from the porous concrete sub-foundation layer (s) below the containment basemat?
I s.
Enclosure