ML20198S161

Forwards Open Items Associated W/Chapter 2.5 of AP600 SER

ML20198S161
Person / Time
Site:	05200003
Issue date:	12/08/1997
From:	Joseph Sebrosky NRC (Affiliation Not Assigned)
To:	Liparulo N WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
References
NUDOCS 9801260092
Download: ML20198S161 (5)

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Decenber 8,1997 u

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Mr. Nicholas J. Liparulo, Manager Nuclear Safety and Regulatory Analysis Nuclear and Advanced Technology Division Westinghouse Electric Corporation -

P.O. Box 355

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Pittsbutgh, PA 15230

SUBJECT:

OPEN ITEMS ASSOCIATED WITH CHAPTER 2 OF THE AP600 SAFETY EVALUA-TION REPORT (SER)

Dear Mr. Uparulo The Civil Engineering and Geosciences Branch of the Division of Engineering has provided an

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SER for Chapter 2.5. However, the SER contained some open items. These open items have been extracted from tne SER and can be found in the enclosure to this letter.

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. You have requested that portions of the information submitted in the June 1992, application for

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d design certification be exempt from mandatory public disclosure. VMe the staff has not c

completed its review of your request in accordance with the requireunts of 10 CFR 2.790, that h fi portion of the submitted information is being withheld from public disclosure pending the staffs

/' ' i final determination. The staff concludes that these follow on questions do not contain those

% 4 g portions of the information for which exemption is sought. However, the staff will withhold this

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r letter from public disclosure for 30 calendar days from the date of this letter to allow Westing-l 1 3 house the opportunity to verify the staffs conclusions. If, after that time, you do not request that 4.,

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. all or portions of the information in the enclosures be withheld from public disclosure in accor-

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'cance _with'10 CFR 2.790, this letter will be placed in the Nuclear Regulatory Commission Public t k ? Document Room.

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If you have any questions regarding this matter, you may contact me at (301) 415-1132.-

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Sincerely,

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original,igned by:

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Joseph M. Sebrosky, Project Manager V

• Standardization Project Directorate i;

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Division of Reactor Program Management-y Office of Nuclear Reactor Regulation 1

, Docket No.52-003 q i

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Enclosure:

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DISTRIBUTION:

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DOCUMENT NAME: A:ECGB_25.RAI-To receive a copy of this document, Indicate in the boxi "C" = Copy without attachment / enclosure "E" = Copy with rttachment/ enclosure - "N" = No copy OFFICE PM:PDST:DRPM l. D:ECGB:DE l6 D:PDST:DRPM l l

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1 Mr. Nicholas J. Liperulo Docket No.52-003 Westinghouse Electric Corporation AP600 cc:

Mr. B. A. McIntyre Ms. Cindy L. Haag Advanced Plant Safety & Licensing Advanced Plant Safety & Licensing Westinghouse Electric Cceporation Westinghouse Electric Corporation Energy Systems Business Unit Energy Systems Business Unit P.O. Box 355 Box 355 Pittsburgh, PA 15230 Pittsburgh, FA 15230 Enclosure to be distributed to the following addressees after the result of the proprietary evaluation is received from Westinghouse:

Mr. Russ Bell Ms. Lynn Connor Senior Project Manager, Programs DOC Search Associates Nudear Energy Institute Post Office Box 34 1776 l Strut, NW Cabin John, MD 20818 Suite 300 Washington, DC 20006 3706 Mr. Robert H. Buchholz GE Nuclear Energy Dr. Craig D. Sawyer, Manager 175 Curtner Avenue, MC 781 Advanced Reactor Programs San Jose, CA 95125 GE Nuclear Energy 175 Curtner Avenue, MC 754 Mr. Sterling Franks San Jose, CA 95125 U.S. Department of Energy NE 50 Barton Z. Cowan, Esq.

19901 Germantown Road Eckert Seamans Cherin & Mellott Germantown, MD 20874 600 Grant Street 42nd Floor Pittsburgh, PA 15219 Mr. Charies Thompson, Nuclear Engineer AP600 Certification Mr. Frank A. Ross NE50 U.S. Department of Energy, NE-42 19901 Germantown Road Office of LWR Safety and Technology Germantown, MD 20874 19901 Germantown Road Germantown, MD 20874 Mr. Ed Rodwell, Manager PW7 Design Certification Electric Power Research Institute 3412 Hillview Avenue Palo Alto, CA !4303 x

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_ TION: Latter to Mr. Nicha!as J. I haulo. dated: Decamhar 8.1997

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L Open items Associated with Chapter 2.5

( wn Nem 230.141F from Section 2.5.1 COL applicants referencing the AP600 certified design will be required to provide the following site specific geologic and seismic information.

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regional and site physiography, j

e geomorphology, e

stratigraphy, e

lithology, j

e structural geology, e

tectonics and e

seismicity.

This is COL Action item 2.5.1 1. Westinghouse included this requirement in SSAR Revision 2, Section 2.5.1, open item 2.b.1 1 It r.losed. However, the word " lithography"in the SSAR Section 2.5.1 should be replaced by

• lithology". This is considered a open item.

Open item 230.142F from Section 2.5.4.2 j

Based on discussions at the review meeting during August 4 through 7,1997, Westinghouse has included in Section 2.5.4.5.3 of SSAR Revision 17 corialn criteria to be used to define uniform site conditions as discussed below. The subsurface may consitt of layers which may dip with respect to the horizontal, and whose physical properties may not vary systematically across a horizontal plane. The recommended methodology for checking uniformity of a site is to determine inom the boring logs a series of "best estimate" planes that define the top and bottom of each layer beneath the nuclear island footprint. These planes should represent the boundaries between layers having different shear wave velocities (which primarily define the uniformity of a site). For a site to be considered uniform, the veristion of shear wave velocity in the material below the foundation to a depth of 120 feet below finished grade within the nuclear island footprint shall meet the following criteria:

Case 1: For a layer with a low strain shear wave velocity greater than or equal to 2500 feet per second, the layer should have approximately uniform thickness, should have a dip not greater than 20 degrees, and should have less than 20 percent variation in the shear wave velocity from the average velocity within any layer.

Case 2: For a layer with a low str'in shear wave velocity less than 2500 feet per second, the layer should have approximately uniform thickness, should have a dip not greater than 20 degrees, and should have less than 10 percent variation in the shear wave velocity from the average velocity within any layer.

The above criterta are included in SSAR Revision 17 Section 2.5.4 5.3. However, the above criteria should also be included in the SSAR Table 2.1 under the heading

• Soil, Uniformity of Site". This is a new open item.

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2 Open llem 230.143F from Seetion 2.5.4.2

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Gubsection 2.6.4.5.3 in Revision 17 of the SSAR does not spoolfy the 20 percent variation in the shear wave velocity for a layer w6th a shear wave velocity greater than i(AC feet per second (Case 1 above), whereas the 10 percent variation is specified for the Case 2 as discussed at the l

August 4 through 7,1997 review meeting. This should be done in the next revision of the SSAR.

This is considered a new open item.

Open item 230.144F from Section 2.8.4.7 In response to a staff question on how the high bearing capacity requirement will be met for a

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soft soll site with a low shear wave velocity of 304.8 m/sec (1000 fps), Westinghouse stated that i

the evaluation of the soils is site specific and within the scope of the COL application.

' Section 2.5.4.2 in SSAR Revision 15 stated that, for selected soft soil profiles in oohesive soils.

.sollimprovement techniques may be employed to improve the bearing strength. During the i

discussions with the staff at the August 4 through 7,1997 meeting, it was agreed that such soft soils fall outside the range of site certification and accordingly Westinghouse has deleted reference to improving such soft soils in SSAR Revision 17. COL applicants must demonstrate that the site specific soil bearing capacity is equal to or greater than the value documented in l

Table 21 of the SSAR. COL applicants will be required to document the method used to establish the site specific soil bearing capacity, and submit it for review and approval by the staff.

l Westinghouse included these requirements in SSAR Revision 5 Section 2.5.4.5.7. This is shown as COL Action item 2.5.4.6.7 in SSAR Revision 17. Open item 2.5.4.71 is therefore closed.

However, the staff does not agree with a statement made in SSAR Revision 17 Subsection 2.5.4.2 that " generally, once the static bear!ng capacity at a given site is adequate, j

dynamic bearing demand will be satisfied", since Westinghouse did not demonstrate the validity j

of this statement in any of the meetings with the staff. Therefore, COL applicants will be required to demonstrate that the dynamic bearing demand will be satisfied by comparing it with the site.

specific sel9mic bearing capacity of the soils in addition to satisfying the static bearing demand

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with respect to the static bearing capacity value given in the SSAR Table 21. This is a Col.

action item, and should be incorporated in the next revision of the SSAR. This is on open item.

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