ML20127M939
| ML20127M939 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 03/09/1967 |
| From: | Price H US ATOMIC ENERGY COMMISSION (AEC) |
| To: | David Nelson NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 9211300516 | |
| Download: ML20127M939 (5) | |
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Donald E. ?!cicon Vico Procident cud Cencral Councol 11orthern Stateo Power Comp:ny p
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Decr tir.1;oloon t
This to in reply to the lottern of 1:orthern Statco Pouer Company, dated January 27 and Pcbrucry 23,1967, rc3crding certain vork propoced to bo perfomed ct the cito of the lionticello !!uclear Pouer Plant prior to tho iccuenco of a construction permit by the Co=:2iccion.
You stato that prior to the incuenco of the conutruction pcmit you propoco to 1) undertcho tho exesvation for the reactor build-in; and the turbino buildin3; 2) bocin conctruction of tho tur-bine building; 3) install cene. cat of concreto under the tur-bins buildin3 to civo cupport to the certh underlying tho floor of that building which would eventually bo cither incorporated as a porcanent pcrt of ono uc11 cad a pcrt of the floor of the rccctor building, or could to independent of the rccctor build-ina, depending on which citernativa io colected; 4) inctall a thin concreto cud clob ceroco the recctor building c=ccvation;
- 5) croct vooden fomo for the recctor butiding floor cnd unllos and 6) picco but not ottsch roinforcina etcol for the floor of the rocctor building in the cuccvotion for that building.
In the attached cecorendum, the Co=niccion's Cencral Councol hec cdviced that the provicions of 10 CD G 50.10(b) do not proocribe the perfornanco of the follouins vorh, as deceribed in your letter of January 27, prior to the iccuenco of a con-ctruction pcmits tho exccvationc for the reactor and turbina buildinso; the construction of tho turbino building; tho in-
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ct:11ction of the concreto c:ad clob; the croction of tho vooden foms; cad the piccoment of the rainforcins etcol in the rccctor building cxccvetion.
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Donald E. Netoon, Esq.,
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uith rocpoet to tho tuo citernctives you propoco for the installation of a co;=ent of concroto under tho turbine building to givo cupport to the c:rth underlying tho floor of the turbino building, the Cencral Councol hoo l
cdviced that the altornativo which involves tho eventuni incorporation of this cc ment in the us11 cod floor of the rc:ctor building to proccribed by 10 Crp. $ 50.10(b).
The other ottornativo_10- not so proceribed and may bo l
followed prior to tho iccucnco of a construction permit.
'In your letter of February 23, 1957, you requected, pur-l l
cuent to 10 Cr?. 5 50.12, an exc=ption from the provicions of 10 Cn
- 50.10(b), to the extent that cuch an c::cmption is rr -4 *
+a permit the conduct of tho work doccribed in i
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- 19.act of Janusry 27, 1967, prior to tho incuenco of a
.i permit. You stato that tho commencenant of l
c a or about tierch 1,1967, is nococcary in order v tho availability of tho !!antico11o plant for com.
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. e.oduction of electric cn:rgy on ochoduto, and is, t
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- t. :afore, in tho public intercot.
Uo hava carefully revicted your requoct for en exemption '
end the reccons cet forth in cupport thcroof, cnd hcyo concluded that the gecatins of the propoced exemption to L
cuthorized by Icv, will not endsnacr lifo or property or the common dofonco and tecurity cnd in othervico in the pub-lic interost. Accordinaly, the Corniocion hereby cuthorises.
i you to inctall, prior to tho tecu:nce of a conctruction-permit, a co; ment of concroto under the turbino building floor of the lionticollo Ducicce pouer plant, co propocod-in your letter of Jccu:ry 27, 1957, uhich vill bo in-a s;
j corporated co part of the reactor buildins voll and floor.
I,vich to emphasi:o that tho grantin3 of this exemption f
chall hevo no effcet upon the cubcoquent granting or f
dental,of a construction permit for the propocod 1 onticello 7
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WJi 9 1967 Donald E. Nelson, Esq.
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Nuclear Power Plant, and any work perforced purcuant to J.
this exemption shall bo performod entirely at the rich of Northorn States Power company.
Furthor=oro, the granting
- of this exception doos not constituto en opproval of the type or adequacy of tho.sogmont or of the method of its.
installation.;
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..c Sincoroly yours,
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As statad-j cci Cerald Charnoff, Esq.-
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l I" Northern States Pcver Company Monticello Nuclear GeneratinE Plant, Minnesota HYDRO 140Y The site is located on a bluff on the right bank of the Mississippi River, abeut 4 miles upstream from !&nticello, Minnesota. The reacter grade altituae has been set at 935 feet abcve mean sea level, and critical equipment in the cooling vater intake structure is to be flecdprocfed to a stage of 930 feet. This appears to be well above 4
the maximum probable stage to be expected at the site.
Minimum flov in this reach of the river since abcut 1915 has been about 250 cubic feet per secend, more than an crder cf macnitude nigher than the service water requirement fer safe shutdevn, given as 6000 gallcas per minute (about 13 5 cubic feet per secend).
acottal The analysis of the Geclecy of the Menticelle Nuclear Generatinc 3.:
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.i{bb plant site presented in Atomic Energy Ccenissica D;chet (50-203 and w _
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, fh supplements) was reviewed and ccmpared with the available literature.
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There are no identifiable ceolegic structures which ceuld be expected g
te localize earthquakes in JKe immediate vicinity cf the plant.
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g h-Locatica of the massive reinfcrced concrete intake structure anchered to bedreck footings between the plan't' and 'the river bank, as shevn' on Figs. 8.1-2 and 8.1-3, should cbviate potential preblems resulting l
from sudden slepe failures or undercutting by the river in that area.
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