ML18018B639

Forwards Addl Info Re Design of Fuel Handling Bldg Retaining Wall,In Response to SER Open Item 1 & NRC 840404 Concerns

ML18018B639
Person / Time
Site:	Harris
Issue date:	04/19/1984
From:	Mcduffie M CAROLINA POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NLS-84-183, NUDOCS 8404270115
Download: ML18018B639 (6)

Text

REGULAT ORMATION DISTRIBUTIO YS 1 (RIOS)

ACCESSION NBR;8404270115 DOC ~ DATE: 84/04/19 NOTARIZED! NO DOCKET 0 FACIL:50 400 Shearon Harris Nuclear Power'lantr Unit lr Car'olina 05000400 AUTH NAME'UTHOR AFFILIATION

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MCDUFFIE~M,A, Car ol ina Power>> 8 Light Co, RECIP,NAME RECIPIENT AFFILIATION DENTONgH ~ RE Of f ice'f Nuclear Reactor Regul ationr Dir ector

'SUBJECTS For wards addi info re design of fuel handling bldg retaining wall in response to "SER,Open I.tern 1 8 NRC 840404 concerns, DISTRIBUTION CODE. 8001S COPIES 'RECEIVED'LTR *-ENCL SIZE'

-TITLE: Licensing Submittal: PSAR/FSAR Amdts 8, Related Correspondence-NOTES!

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SERIAL: NLS-84-183 Carolina Power & Linllt Company gpss. >9 198<

Nr. Harold R. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO ~ 1 DOCKET NO ~ 50-400 DESIGN OF RETAINING WALL

Dear Nr. Denton:

Carolina Power & Light Company hereby submits additional information concerning the Shearon Harris Nuclear Power Plant design of the Fuel Handling Building Retaining Wall. This information is in response to Safety Evaluation Report Open Item 1 and additional NRC concerns on the design of the Retaining Wall expressed in the meeting in Bethesda, Naryland on April 4, 1984.

If you have further questions or require additional information, please contact my staff.

Yours very truly, N. A. NcDuffie Senior Vice President Nuclear Generation JHE/ccc (9888GAS)

Attachment CC: Nr. B. C. Buckley (NRC) Nr. Wells Eddleman Nr. J. T. Chen (NRC-SGEB) Dr. Phyllis Lotchin Nr. G. F. Naxwell (NRC-SHNPP) Nr. John D. Runkle Nr. J. P. O'Reilly (NRC-RII) Dr. Richard D. Wilson Nr. Travis Payne (KUDZU) Nr. G. 0. Bright (ASLB)

Nr. Daniel F. Read (CHANGE/ELP) Dr. J. H. Carpenter (ASLB)

Chapel Hill Public Library Nr. J. L. Kelley (ASLB)

Wake County Public Library 8404iq 8404270ii5 05000400 PDR ADQCK E

PDR (egt 411 Fayettevlge Street o P. O. Box 1551 ~ Raleigh, N. C. 27602

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ATTACkRIENT NRC CONCERN Justify the soil bearing capacity used for the design of the lower two rows of deadmen, or review the design for the soil bearing capacity as determined by the procedure given in NAVFAC Design Hanual D~f-7.

RESPONSE

For the static load combination, the present design had conservatively used a minimum factor of safety of 1.5 over the allowable soil bearing capacity (ultimate capacity divided by 2), which in fact'rovided a factor of safety of more than 3 over the ultimate.

The design has now been reviewed for the soil bearing capacity as determined by Figure 11-1 of NAVFAC D>1-7, for tan g' 0.6 tan 4. The lower two rows of deadmen have a minimum factor of safety of 2.24 over the ultimate soil bearing capacity, which is more than the factor of 2 required by Figure 10-14 of NAVFAC DN-7. The minimum factor of safety over the ultimate soil bearing capacity for the dynamic load combination is 1.76.

NRC CONCERN Verify if there is enough distance between the deadmen and the retaining wall to develop the bearing capacity of the soil used for design of the lower two rows of deadmen.

RESPONSE

The deadmen are located at an adequate distance from the retaining wall to develop the ultimate soil bearing capacity used for the design of deadmen.

The potential soil failure surfaces for possible rotation of deadmen due to the horizontal pull for the ultimate bearing capacity of the soil (without any reduction of 4) do not interfere with the active wedge failure plane behind the retaining wall. The ultimate soil bearing capacity with reduced 4 (i.e.,

tan g' 0.6 tan 4) has a factor of safety of more than 2 for the static condition, which includes full hydrostatic pressure on the wall due to groundwater level at Elevation 251 feet (no relief in hydrostatic pressure is taken for the drainage system provided behind the retaining wall). Therefore, the deadmen are adequately designed.

NRC CONCERN Monitoring system should be provided to measure the horizontal movement of retaining wall at the base. The monitoring frequency should be as required by NRC Regulatory Guide 1.127, Position C.4.

RESPONSE

The drawings of the retaining wall will be revised to reflect the monuments being installed for monitoring horizontal movement of the retaining wall at the base. The frequency of monitoring will be in accordance with Position C.4 of Regulatory Guide 1.127 (Rev. 1).

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