ML20134H379
| ML20134H379 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 10/01/1996 |
| From: | Pugh C OAK RIDGE NATIONAL LABORATORY |
| To: | Murphy A NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| References | |
| NUDOCS 9611140079 | |
| Download: ML20134H379 (3) | |
Text
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?W OAK RIDGE NATIONAL LABORATORY NRC Programs Office MANAGED BY LOCKHEED MARTIN ENERGY RESEARCH CORPORATION PHONE: (423) 574 0422 FOR THE U.S. DEPARTMENT OF ENERGY F AX: (423) 241-5005 INTERNET: pug @wnl. gov OM ROGE. m 37e31453 October 1,1996 1
Dr. Andrew J. Murphy Chief, Structural and Geological Engineering Branch Division of Engineering Technology Office of Nuclear Regulatory Research U. S. Nuclear Regulatory Commission Mail Stop TWFN 10 L1 Washington, DC 20555-0001
Dear Dr. Mmphy:
Revised Pages for ORNL Review of Information Relative to Millstone-3 Plant Sump Discharge Two revised pages for the subject review are attached. The last paragraph of the text in the review submitted to you on September 26 was incomplete. The revised pages complete that paragraph and should replace the last two pages of that earlier document.
Mr. C. B. Oland led the review and prepared the completion to the subject paragraph. If you have questions, his telephone and telefax numbers are (423) 574-0659 and (423) 574-0651, -
respectively.
Sincerely, f
Claud E. Pugh, Director ORNL NRC Programs Attachment c:
C. B. Oland D. J. Naus W. E. Norris, NRC/RES-SGEB File-RC CDDU 9611140079 961001 PDR ADOCK 05000423 j
p PDR
~ 0]ringin7 CScience to Bife
7 ability of this subbase layer to suppon the applied loads from the containment has not changed since it was constructed.
Interactions between Portland and Iligh-Alumina Cement Concretes Degradation of the portland cement mortar located below the high-alumina cement concrete layer, and degradation of the ponland cement concrete base slab located above the high-alumina cement concrete due to chemical interaction between the cementitious materials is not considered likely. The high-alumina cement concrete is not a source of alkalis that could contribute to alkali-aggregate reactions of the ponland cement concrete or monar. In addition, the alkalis in the low-
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alkali ponland cement conemte and monar should not attack the high-alumina cement concrete because these cementitious materials only have one common interface.
Although high-alumina and ponland cement were not used in the same concrete mixture.
casting the ponland cement base slab concate directly on top of the sealed, porous high-alumina cement concrete subbase layer may'have resulted in an inadvenent interaction between the two concretes. Heat produced by the hydration of the ponland cement and the presence of moisture in the fresh concrete may have accelerated the conversion of the high-alumina cement concrete making the high-alumina cement paste on the surfaces of the aggregate panicles soft and loos' at an early e
stage in the plant's life. Based on the assessment described in the previous section, the ultimate bearing capacity of the porous concrete subbase layer does not dependent on the presence or magnitude of the bond between the high-alumina cement paste and the aggregate particles.
Therefore, degradation of the high-alumina cement paste by conversion should not adversely affect the ability of the containment to perfomi its intended safety functions or resnlt in detectable settlement of the coruainment.
REFERENCES Information Provided for Review 1.
12tter to R. Y. Schonenberg, Nonheast Nuclear Service Co., Hanford, Connecticut, from P. E. House, ABB Combustion Engineering Nuclear Operations, Windsor, Connecticut.
Subject:
Analyses Results of Cement Samples, August 2,1991.
2.
Document from Nonheast Utilities to the NRC addressing questions about Millstone, Unit 3, July 22,1996,22 pages.
3.
Figures from an unknown source: (1) Key plan, (2) Containment structure, (3) Detail containment mat and ring girder, (4) Detail of membrane and foundation mat, (5) Plan el.
(-)37'-6" layout of sump drainage, (6) Plan at el. (-)26'-0" cross section of ring girder, (7) Aggregate interlock and cement coating, and (8) Detail of membrane and foundation m at.
4.
McIntire, M.," Millstone Plant's Cement Received NRC Approval," The Hartford Courant, July 7,1996.
5.
Memo from R. Y. Schonenberg to G. Swider, Northeast Utilities,
Subject:
PA 86-261, Analysis of Debris Found in MP3 ESF Sumps, September 19,1991.
6.
12tter to Mr. David Dakers, Nonheast Nuclear Energy Co., Waterford, Connecticut, from ABB Combustion Engineering Nuclear Operations, Windsor, Connecticut.
Subject:
_ Analysis of Millstone-3 Containment Sump and Mockup Samples, July 9,1996.
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Other Documentation Considered i
I 7.
" Standard Specification for Portland Cement," ASTM Designation: C 150, 1991 Annual Book of ASTM Standards, Vol. 04.02, American Society for Testing and Materials, Philadelphia, Pennsylvania,1991, pp. 92-96.
1 8.
Peck, R. B., Hanson, W. E., and Thornburn, T. H., Foundation Engineering, John Wiley and Sons, Inc., New York, New York,1953.
9.
Terzaghi, K. and Peck, R. B., SoilMechanics in Engineering Practice, Second Edition, John Wiley and Sons, Inc., New York, New York,1967.
10.
Malhotra, V. M., "No-Fines Concrete - Its Properties and Applications", ACI Journal, Proceedings, Vol. 73, No. I1, American Concrete Institute, Farmington Hills, Michigan,
. November 1976, pp. 628-645.
I 1.
Neville, A. M., Properties of Concrete, John Wiley and Sons, Inc., New York, New York,1963.
12.
Neville, A. M. and Brooks, J. J., Concrete Technology, John Wiley and Sons, Inc., New York, New York,1987.
13.
Neville, A. M., High Alumina Cement Concrete, John Wiley and Sons, Inc., New York, New York,1975.
14.
" Assessment of Chemical Attack of High Alumina Cement Concrete," IP 22/81, Building Research Establishment, Garston, Watford, United Kingdom, November 1981.
15.
Lea, F. M., The Chemistry of Cement and Concrete, Third Edition, Chemical Publishing Co., Inc., New York, New York,1971.
16.
Collins, R. J. and Gutt, W.,"Research on Long-Term Properties of High Alumina Cement Concrete," Magazine of Concrete Research, Vol. 40, No. 145, Building Research j
Establishment Information, Garston, Watford, United Kingdom, December 1998, i
pp.195-208.
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