ML20212M146

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Forwards Info Obtained by J Knight in Recent Visit to Japan Re Seismic Shaking Tests of Tokai-2 Reactor Bldg.Very Large Mechanical Shakers Used to Excite Full Scale Reactor Bldg. Info Relevant to Facilities
ML20212M146
Person / Time
Site: 05000000, Diablo Canyon
Issue date: 12/21/1977
From: Allison D
Office of Nuclear Reactor Regulation
To: Stolz J
Office of Nuclear Reactor Regulation
Shared Package
ML20150F500 List: ... further results
References
FOIA-86-391 NUDOCS 8608250391
Download: ML20212M146 (17)
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Text

{{#Wiki_filter:~ . x.- = = --- - .- a. u.- - - = ;. a . )- ). e DEC 211977 k 37 Docket No. 50-275 and 50-323 MEMORANDUM FOR: John F. Stolz, Chief. Light Water Reactors Branch No.1 FROM: D. P. Allison, Project Manager, Light Water Reactors Branch No.1

SUBJECT:

DIABLO CANYON SEISMIC DESIGN - DAMPING The attached information was obtained by Jim Knight in a recent visit to Japan. It concerns seismic shaking tests of the Tokai-2 reactor building. This test was novel in that very large mechanical shakers were used to excite a full scale reactor building. Damping in the fundamental mode was estimated at 20% of critical damping.or greater, as compared p to 5% assumed in the design calculations. The purpose of this memorandum is to distribute this information to the files, public document recms and i g g g ies. Dennis P. AilhQ-D. P. Allison, Project Manager Light Water Reactors Branch No. 1 Division of Project Management

Enclosure:

As stated cc: See page 2 Distribution Docket Files NRC PDR Local PDR I. Sihweil J. P. Knight J. McKinley - ACRS (27) 8608250391 860001 N. Newmark - University of Illinois n rs % of Mlinois NCH8fd391 PDR J. Devine - USGS J. C. Stepp R. B. Hofmann j

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I W lW D .,,c. DAlfison/ red 12/21/77 N Q$/ g J g,-. 7,.m - oyo

i. .) ) . cc: Pacific Gas and Electric Company Mr. William P. Cornwell ATTN: Mr. John C. Morrissey P. O. Box 453 Vice President & General Counsel Morro Bay, California 93442 77 Beale Street San Francisco, California 94106 Mr. James 0. Schuyler, Nuclear Projects Engineer Philip A. Crane, Jr., Esq. Pacific Gas and Electric Company Pacific Gas.and Electric Company 77 Beale Street 77 Beale Street San Francisco, California 94106 San Francisco, California 94106 1 Mr. W. C. Gan9 off Janice E. Kerr, Esq. Westinghouse Electric Corporation California Public Utilities Commission P. 0. Box 355 350 McAllister Street Pittsburgh, Pennsylvania 15230 San Francisco, California 94102 Brent Rushforth, Esq. Mr. Frederick Eissler, President Center for Law in the Public Scenic Shoreline Preservation Interest Conference, Inc. 10203 Santa Monica Boulevard 4623 More Mesa Drive Los Angeles, California 90067 Santa Barbara, California 93105 gsuguaw Arthur C. Gehr, Esq. Ms. Elizabeth E. Apfelberg Snell & Wilmer 1415 Cazadero 3100 Val, ley Center ~ San Luis Obispo, California 93401 Phoenix, Arizona 85073 Ms. Sandra A. Silver Bruce Norton, Esq. 425 Luneta Drive 3216 North 3rd Street San Luis Obispo, California 93401 Suite 202 Phoenix,~ Arizona 85012 Mr. Gordon A. Silver 425 Luneta Drive Michael R. Klein, Esq. San Luis Obispo, California 93401 Wilmer, Cutler & Pickering 1666 K Street, N. W. Paul C. Valentine, Esq. Washington, D. C. 20006 400 Channing Avenue Palo Alto, California 94301 David F. Fleischaker, Esq. 102515th Street, H. W. [ Yale I. Jones, Esq. 5th Floor 100 Van Ness Avenue Washington, D. C. 20005 19th Floor San Francisco, Califonria 94102 Mr. R. C. Martin, Geologist California Division of Mines and Ms. Rave Fleming Geology 1746 Chorro Street 107 South Broadway San Luie, Obispo, California 93401 Room 1063 Los Angeles, California 90012

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S L,l.%) h a y l (. O h )O. A ll, % ) VIBRATION TEST OF TOKAI-2 BWR-Il00 >Bie-REACTOR BUILDING 1. Vibration test of vital building structure, system and component of Nuclear Facility has been Japan Practice and is used to regard as a kind of pre-operationa1 test. Final purpose of the Test is to assure validity of aseismic design and method applied therein, and to confirm the aseismic structural integrity. 2. Since TOKAI-2 Reactor Building was completed 1977 Summer, which has 68 m square base mat, 80 m of height and 260 Kilo-ton of total GT4k.,_m veight(Fig.1 ),thevibrationtestwasperformedusinglarge shaking machine units. 3 Contents of the test consist of the horizontal and vertical enforced r excitation methods as varied gradually frequencies in order to get directly frequency response spectra (Fig.7,8 ). .4. For vibration measurement instrument, detector pick-up of velocity type were set up at approp,riate position on the each floor (Fig.2-1) 1 25 as is convenient to make a mode shape figure. l 5 In the outside of the building, test control center was provided, which included a shaking machine },ower unit, a shaking machine control unit and a data treatment / analysis unit (Fig. 1 ). l 6. The vibration. measurement data was treated and analyzed in real time during test stage, inthedatatreatment/analysisunitabove. 7. From the results of the vibration tests, the max. response accele-ration of bui/iing was about 10 gal. &b &~3q) A-99

} Predominant natural frequencies, although there were many eigen values,were2.7Hz(lat),45Hz(2nd),8.8Hz(3rd),...... (Fig. 7 ). Damping coefficient for the fundamental mode, though it was lifficult to measure exactly, was estimated 20% and'over. T..+,!iedesignstage,calcul~atednaturalfrequencieswere2.4Hz(1st), ?.

z. 9 Hz (2nd), 8 3 Hz (3rd),......, and assumed design damping coefficient were 5% for each mode.

9 Vibration characteristics as the natural frequencies were in good agreement between the design alaysis and the test results, and the design damping were over-conservative in comparison with the test results. Therefore, it was concluded that the seismic design and analysis methods for the reactor building were conservative and safety. I e e I l l l [ 7-

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