ML18017A609
| ML18017A609 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 08/02/1979 |
| From: | Mcduffie M CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 7908070530 | |
| Download: ML18017A609 (11) | |
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FORM2M'~m Catellns Power & Uaht Company Aaleigh, k G. 27602 4Z(l.e CapV Mr. James P. O'Reilly, Director Region XI U. S. Huciear Regulatory Commission 101 Marietta Street, H.W..
Atlanta, Georgia 30303 SHEARQK HARRXS HUCLEAR POWER PLAHT~ UHIT NOS ~ I, 2~ 3, AHD 4 DOClKT HOS. 50~, 5~01, 50~2, AHD 50%03 EKKGEHCT SERVICE WATER XHTAKE CELNHEL
Dear Mr. O'Raiily:
i 8r On May 4, 1979, HRC Region XI informed Carolina Po>>ex
& Light Company (CP&L) that tba Huclear Re'actor Regulation's (HRR) approval of previously pLaced f111 at'he Shearon Harris Hucisar Po>>ar Plant'a (SHHPP) powerhouse block, dame and dikes, and CLass I piping areas would be required in writing prior to the place-meat of, additional Category I fill Also, the implementing procedures for placing fillin these areas should be reviewed by HRC Region II personnel.
Since that data, CP&L has been conducting; evaluations of backfill areas for HRC Region XI release.
Even though HRC did not address tha placement of seLect impervious, and modified.
random fiLL aLong the Emergency Service Water Intake Channel, the on-going CP&L evaluation of backfi11 material has included this area.
Attached is an evaluation of backfiIL. previously placed along the channel Ituing.
The attached SHHPP PSAR Figure 2.6-6a provides a profile and sect1on plan of the emergency service water intake channel The channel embadaaeat, which is to be partially constructed with.fillmaterial, wiil,Line'a channel approximately 22 feet deep with side slopes of 2sl Q~ontal:vertical) to the top elevation of 260 feet.
An approximate 50 foot xone on each side of the channel, making up a Lining where natural ground is belo>> 260 feat, wi11 be constructed with modified random filland select impervious material as required by Specification CAR-SH-CHW "Embankments, Dams, Dikes, and Qumnels".
As described in the attached evaluation, fillmaterial has been placed in certain areas between Stations 0+00 and 12+00 and 13+50'nd 21+00 where natural ground is beio>> 260 feet.
Modified random fiLIwas placed by method control as developed by test fills and checked for abiLity ta rata1n water by periodic field permeability tests as reqaLrad by Specification CH-4 The Specification CH-4 also allo>>s the use of select impervious material without the need tor field permeability testing.
The ma)ority of chumel lining was constructed with modified random fillwhich consists of weathered siltstone, ciaystone or sandstone ezcavatad by ripping" with an allo>>able aumbmm part1cle sime of 10 inches.
Ho>>ever, select impervicnus'material (residual" soil with high cLay content) was also used hand placed by methods control as developed by test fills.
The select pent V9080y0 g g ~
Mr. James P. O'Reflly impervious material +as observed by qualif1ed inspectors to assure the material was close to optimum befoxe compaction.
Test fills fadicated the compaetioa effort resulted fn densitfea of at least 95X Standard Proctor; however, there vas no syecific mo1stuze control.
Therefore due to HRC Region II aad HRR recent concerns With moisture concrol for impervious soil materials an evaluacion of the channel Lining vaa completed.
Test fiU. sad in~iace evaluation results indicate the modff1ed random fillconsfsts of brovn clayey silt vith pieces of siltstone at 98X'Standard Proctor density snd 7.5X moisture content, snd select impervious ffIIconsists of tan to light brown silty clay at 98.1X Standard Praetor density and 20.8I moisture content.
Addftfonal ia<<place density tests vere completed duxing this evaluation to assure the density of select impervious material was about 95X Standard Proctor' Although Che actual moisture content at compaction could aot be determined, the percent had to be reasonably close to optimum to obtaia about 95X Standard Proctor.
Siace modiffed random fiIIslopes axe considerably more stable thea sloyes consfstfag of select impervious material, ao additional testiag on modfffed random fillvaa coasidexed necessaxy..
The.select impervfous material snd modfffed random fillas placed satisfies the design czftexfa for the channel lining.
Also, to demonstrate the conservative aatux'e of the, channel system desfgn, sectfoa 2'.6.2.2.6 of PSAR states "Xa the un1Qcely eveat of a slfde of the earth slopes, the size of the channels maid be sufficient to pass the mfafmum requfred servfce eater floe at a maoehana average veLocity of 2 feet per second under the coudftfoas of auazimum amcflfaxy reservoir drawdcnm......and maxhmss mafn reservoir dxurdoem during the 100 year drought".
Even though the sheaxiag strength of clay soils may be reduced when molded at higher thea oytimum moisture content, select impervious matezial compacted to at least 95Z Standard Proctor rhea placed at a slope of 2 horizontal to oae vert1cal vtIl provide aa adequate factor of safety against slope failure.
Attached aze figures indicating locatfoas of field permeability tests snd in-place density tests taken for select impexvfous sad modified random fill previously placed AII.material placed satisfies sita procedures and specification requirements in relation to density aad permeability.
Tabulated data is attached.
CP&1 requests your formal concurrence of the fillmaterial yrev1ously placed as described above sad your release for coatiaued construction of the emergency service vater intake chaaael Lining.
Tours very truly, PRIGlNAlSlC~ED +
M. A. McOUFFIE M. h~ MeDufffe Senior Vice President Eagfneerfag 5 ConstrucCioa Attachmeats cc:
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- "EST NO.
LOCATION ELEVATION TEST MATERIAL DESCRIPTION DENSITY PCF MOISTURE CONTENT PERCENT COMPACTION TEST PERMEABILITY RATE," FT/YR MAXIMUM PERMEABILITY ~ FT/YR FPA-369 FPA-370 FPA-371 FPA-372 FPA-373 FPA-374 Sta 17 + 00 Cl + 40' Sta 18 + 50 Cl + 40' Sta 18 + 00 Cl + 40' Sta 15 + 00 Cl + 55' Sta 8+10 Cl + 45' Sta 9 + 25 Cl+42' 254 257 257 255 244 243 Select Impervious Fill Select Impervious Fill Select Impervious Fill Select Impervious Fill Select Impervious Fill Select Impervious Fill 99.4 '05.9 112.9 109.9 110.1 102.0 15.4 18.6 16.4 16.5 18.3
- 21. 8 96.5 100.7 100.7 100.
1'00.2 97.1 30 30, 30 30 30 30 EMERGENCY SERVICE WATER INTAKE CHANNEL CROSS-SECTIONS NORTH SLOPE STATION 0+50 1+20 1+50 2+00 2+20 MATERIAL Na tura 1 Natural with modified random fill and 6" impervious layer Natural with modified random fill& 2'mpervious layer Top impervious layer Bottom impervious layer Natural with modified random fill6 4'mpervious layer Top impervious layer Bottom impervious layer Modified random fillwith impervious layer Top impervious layer Bottom impervious layer ELEVATION. 248 248.5 248 245.5 243.5 248.5 248.5 244.5 248.. 5 243.8 2+50 Top impervious layer Bottom impervious layer Base Elevation remains Modified random fill-constant between station ~ Base of Channel 2+50 and 6+90 238.8 246.2 '243.7 "238.1 3+00 Impervious top bank modified random fill to base 245.6 3+50 4+50 5+50 (T.P.) 6+00 6+50 Modified top bank Modified top bank Modified top bank Modified top bank Modified top bank random fill to base random fill to base random fill to base random fill to base random fill to base 247 246.7 244.8 243. 3 242. 3. 0 NORTH SLOPE (Cont'd): STATION 6+90 MATERIAL Modified random fill-top bank ELEVATION 242; 1 Base elevation remains fairly constant between station 6+90 and 10+00 Base 237.4 7+50 Modified Random fill-top bank - to base 241 8+00 8+50 9+00 9+50. Modified random fill-top bank Top of impervious layer 240.5 Bottom of impervious layer 240 Modified random fill to base. Modified random fill-top 242.9 bank Top impervious layer 240.7 Bottom impervious layer '240.2 Modified random fill to base. Modified random fill-top 244.9 bank Top of impervious layer 242.7 Bottom of impervi'ous layer 242.2 Modified random fill to base. Modified random fill-top 245.8 bank Top of impervious layer 243.6 Bottom of impervious layer 243.1 Modified random fill to base. 10+00 10+50 11+00 Modified random fill-top bank Top of impervious layer Bottom of impervious layer Modified random fill to base. Modified random fill - top bank Top of impervious layer Bottom of impervious layer Modified random fill to base. Modified random fill-top Bank Top of impervious layer Bottom of impervious layer Modified random fill to base. 248. 1 245.9 245.4 238.7 248.5 245.7
- 244, 239.7 248.8 245. 1 242'. 6 240. 8
NORTH SLOPE (Cont'd): STATION 11+50 MATERIAL Modified random fill-top bank Impervious Modified random fill to base. ELEVATION 249. 7 247. 8 244. 3 SOUTH SLOPE: 0+50 1+20 1+50 2+00 2+20 7+50 8400 8+50 9+00 9+50 10+00 Natural with modified random fillat upper elevations Natural with modified random fillat upper elevations Modified random fill Modified random fill Modified random fill Modified random fill-top bank Top of impervious layer To base Modified random fill-top bank Top of impervious layer To base Modified random fill-top bank Top of impervious layer . Base Modified random" fill-top bank Top of impervious layer
- base, Modified random fill-top bank Top of impervious layer Base Modified random fill -
top" bank Top of impervious layer Base Being excavated for Intake S true ture 244.8 242 236. 2 243. 5 240.2 236.4 245.5 241. 9 236.5 246 24'2. 5 236;6 246 243.6 236'. 7 245. 8 244. 2 236.8 SOUTH SLOPE (Cont'd): STATION 10+50 MATERIAL Modified random fill-top bank Top of impervious layer-Base ELEVATION 248 245. 7 235. 2 Base elevation remains fairly cons tand between s ta tion 10+50 and 11+00 11+00 11+50 Modified random fill-top bank Top of impervious layer Bottom of impervious layer Modified random fill to base. Modified random fill-top bank Top of impervious layer Bottom of impervious layer Modified random fill to base 248 246. 9 244.7 251. 4 247.7 246.1 243.4 WEST SLOPE 15+00 Top of impervious layer Bottom of impervious layer Base 257.2 256.7 17+00 Top of impervious layer Bottom of impervious layer Base 257.2 253.5 18+00 Top of impervious layer Bottom of impervious layer Base 257.2 253.5 19+00 Top of impervious layer Bottom of impervious layer Base 258.0 257.5