ML18003A526

Forwards Info & Commitments in Response to 790320 Questions Re Strength of Weathered Rock Foundations & in-place Graduation of Random Embankment Matl

ML18003A526
Person / Time
Site:	Harris
Issue date:	04/09/1979
From:	Mcduffie M CAROLINA POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 7904160089
Download: ML18003A526 (5)

Text

REGULATORY INFORMAT10N DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR+7904160089 OOC ~ DATE! 79/04/09 NOTARIZED! NO DOCKET ¹ FACILe50"400 SHEARON HARRIS NUCLEAR POWER PLANTt UNIT 1 p CAROLINA 05000000 50 401 SHEARON HARRIS NUCLEAR POWER PLANTE UNIT,2 ~ CAROLINA BYNAME 05000401 50 002 SHEARON HARRIS NUCLEAR POWER Pl ANTP UNIT '3g CAROI INA 05000402 AUTH AUTHOR AFFILIATION 5p- gb3 MCDUFFIEPM ~ Ao CAROLINA POWER 5 LIGHT CO RECIP ~ NAME 'ECIPIENT AFFILIATION

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DENTON H,R ~ OFFICE OF NUCLEAR REACTOR Rf GULATlON SUBJECT FORWARDS INFO 5 COMMITMENTS IN RESPONSE TO 790320 QUESTIONS RE STRENGTH OF WEATHEREO ROC'K FOUNDATIONS 5 IN PLACE GRADUATION 0 RANDOM EMBANKMENT MA TL, DISTRIBUTION CODE I SOOIS COPIES RECEIVED'LTR ~ ENCL '~'SIZE i *

TITLE: PSAR/FSAR ANDTS AND RELATED CORRESPONDENCE, NOTES' I

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TOTAL NUMBER OF COPIES REQUIRED: LTTR 49 ENCL SO

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Carolina Pov(er 8 Light Company April 9, 1979 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D. C. 20555 SHEARON HARRIS NUCLEAR POWER PLANT, UNIT NOS. 1, 2, 3, AND 4 DOCKET NOS. 50-400, 50-401, 50-402, AND 50-403 IN-PLACE 'TEST PILL'PROGRAM

Dear Mr. Denton:

In response to your staff's questions of March 20, 1979, concerning the strength of the weathered rock foundations and in-place gradation of random rockfill embankment material for the Shearon Harris Nuclear Power Plant's (SHNPP) auxiliary dam and separating dike, the following information and commitments are provided:

l. Ebasco Specification CAR-SH-CH-4, Embankments, Dams, Dikes, and Channels,"

has been revised to require a) The minimum allowable dry density of the in-situ residual soil where the dam and dike embankments will be placed on suitable soil shall be 98 lb/ft . The expected'verage dry density should be 109 lb/ft3. (Design parameters See PSAR Appendix 2E).

b) The dam and dike residual soil foundation shall be proof rolled to identify wet or soft material. The proof rolling shall consist of slow travel with a loaded pan over 100 percent of the soil surface in both the longitudinal and transverse axis. In areas where the width is restrictive, the proof rolling will be completed only in the longitudinal direction. Any soft or wet material identified shall be removed and replaced with suitable material in accordance with Paragraph 104.

c) The minimum dry shall be 130 lb/ft density for the in-place random rock

. The average dry density for the in-place fill zone random rock fill zone shall be 135 lb/ft3.

d) A site geologist and soil engineer will map and classify the foundation in accordance with ASTM visual classification methods to verify that the foundation conditions conform to the boring data.

~11 Fayetleville Street ~ P. O. Box test ~ Releign, N. C. 27602 V904160o 9

Mr, Harold R. Denton

2. SHNPP Technical Procedure TP-08, "Soil Control Program Class I Dams, Fill and Backfill," has been revised to require:

a) After excavation of unsuitable material where the dam or dike embankment material will be placed on in-situ residual soil, field density tests shall be performed on the prepared surface at a frequency of one test every 5000 ft2. The density tests shall be completed prior to proof rolling.

b) Proof rolling of residual soil where embankment material will be placed shall be monitored by a qualified inspector to assure any wet or soft material. zones are removed and replaced with suitable material in accordance with Ebasco Specification CAR-SH-CH-4.

c) An in-place density test and gradation analysis of the rockfill and random rockfill material shall be performed for every 20,000 cubic yards of material placed. If the first two tests for both density and gradation indicate results consistent with test fill criteria, the frequency can be reduced to every 40,000 cubic yards.

Carolina Power 6 Light Company believes that the above information will allow your staff to approve the in-place test dam and separating dike.

fill program for the SHNPP auxiliary Yours very truly, M. A. McDuffie Senior Vice President Engineering & Construction RGB/mf cc: Mr. J. C. Bryant

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