ML19329E014

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App 2H of Rancho Seco PSAR, Answers to Questions. Includes Revisions 1-4
ML19329E014
Person / Time
Site: Rancho Seco
Issue date: 10/31/1967
From:
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
References
NUDOCS 8004090584
Download: ML19329E014 (14)
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Docket 50-312 Amendment No. 2 April 15, 1968

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QUESTION Discuss the water flow patterns in the vicinity of the plant

\\s 2H.1 and their associated consequences on plant operations following (DRL 2.7) a failure of the on-site water storage facilities.

ANSWER Section 2.4 of the PSAR describes the topography and drainage patterns of the site. As stated, the site is located very favorably for natural drainage.

Open ditches and culverts will be provided around the plant area to intercept any overland flow.

The paved area within the plant slopes away from the buildings and toward the perimeter drainage system.

Storage tanks are located between the build-ings and perimeter drainage system.

Any discharge from these tanks will flow away from the buildings.

The circulating water system canal and intake have a water surface below nominal plant grade.

The result of a postulated failure of the on-site reservoir has been investigated.

The flow from a reservoir failure would pass to the south of the plant.

The invert of the natural drainage channel is approximately 20 feet below the plant grade with a top width of over 1500 feet and could safely pass a flow i

in excess of 175,000 cfs.

Due to the elevation of the plant above the adjacent Sacramento k

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River Delta (see Fig. 2.2-3), there is no downstream control l

V which would affect the stage-discharge relationship of water flowing past the plant. The water flowing past the plant is free to flow at normal depth. The reservoir is far enough up-stream from the plant for the bore wave to collapse prior to passing the plant.

It is difficult to postulate a sudden failure of an earth structure and due to the relative small quantity of water stored in the reservoir any time lag to reach the maximum break will have a substantial influence on the peak t

flow.

An instantaneous break 50' wide and the full height of the dam, occurring simultaneously with the peak discharge of the maximum probable flood, resulting from storm runoff at the plant and adjacent catchment area, will produce a flow of less than

'50,000 cfs past the plant.

Peak discharge of the maximum probable flood, computed by methods developed by the Soil Con-

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servation Service, is less than 2,000 cfs.

4 Peak runoff from the maximum probable storm was based on the probable maximum 6-hour point storm value of 6 inches from storm analyses data prepared by the Bureau of Reclamation.

It is concluded that a failure of a dam occurring simultaneously with the peak discharge of the maximum probable storm will not p

flood the' site. The resulting 50,000 cfs flow will have its l( L) water surface more than 10 feet below any of the safeguards equipment located in the plant yard. This would be the con-trolling elevation in the event of flooding.

Amendment 4 2H-1

QUESTION Provide a map of earthquake epicenters within a radius of D

2H.2 200 miles showing all earthquakes of intensity V or greater (DRL 2.8) at the epicenter.

ANSWER The instrumented epicenters and non-instrumented seismic events within a 50 mile radius of the Rancho Seco site are shown on Figures 2H.2-1 and 2 respectively.

The epicenter map shows the magnitude of earthquakes actually recorded, while the non-instrumented seismic event

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map shows the highest intensity reported for any earthquake.

It is considered that the 50 mile radius map presents a meaningful description of the site and adjacent area since varying geological conditions need not be evaluated. S imi-3 lar maps for a 200 mile radius are shown in Figures 2H.2-3 and 4.

Appendix A to this answer is Professor Byerly's explanation of epicenter maps (Figures 2H.2-1 and 2).

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2H-2 Amendment 3

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. QUESTION Our current review indico es that the design basis earth-2H.3 quake (the marimum earthquake) for the Rancho Seco site

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(DRL 5.8) should correspond to a maximum horizontal ground accelera-tion of at least 0.25g.

The basis for this conclusion stems from the possibility that historical evidence may underestimate the maximum earthquake likely to occur in this province and from a need to provide both for the pos-sible occurrence of local faults that may be unknown in this-region because of the great depth of overburden and for the possible amplification in the alluvium in this geological region. You are asked to consider this basis for the design basis earthquake for the Rancho Seco site.

ANSWER A value of horizontal ground acceleration of 0.25g will be used for the maximum hypothutical earthquake and 0.13 g will be used for the design earthquake.

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4 QUESTION Provide the elevations of the proposed foundations for the 2H.4 containment structure, turbine buildings, and auxiliary

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(DRL 5.9) buildings, in order that they can be compared with the

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boring data provided in the PSAR.

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ANSWER The following structure foundation elevations can be used for correlation with the boring logs:

Structure Elevation Containment Structure 130'-0 Spent Fuel Storage Pool 158'-6 Auxiliary Building 145'-0 Radwaste Building 140'-0 Turbine Building - Mat 155'-6

' Turbine Building - Condenser Area 150'-0 Elevation O'-0" on general arrangement drawings equals elevation 165 MSL.

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' Amendment 3 2H-3 i

Docket 50-312 Amendment No. 2 Perry Byerly April 15, 1968 6037 Contra Costa Road Appendix A to Question 2H.2 Oakland, California 94618

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Phone 654-6893

-.J March 25, 1948 Er, John Mattimoe Sacramento Municipal Utility District Box 2391 Sacramento, California 95811 Res Epicenter Mams

Dear Kr. Mattimoe:

l'ou have asked for epicenter maps and Bechtel has constmotod them according to my specifications.

There must be tuo of them because two different kinds of epi-conter= are involved in the historical record.

1)

Since and where there have been established soismot:aphic ste.tions, instrumental cnicentern may bo located.

Insofar as we know the carth's structure and the volocitios of seismic waves wo may from seismograms locate the place where the waves start, i.e.

tho first source of the carthquake or its focus.

The point on the earth's surface above the focus is the epicenter.

pQ If we hold to the theory that all earthquakes originato by fcult breaks tho instrumental focus should lie on a fault surfaco and the epiconter near the fcult trace on the carth's surfacc.

In practice wo find in California that the instrumental epicontors of the 1crger shocks do lie near the traces of recognised faults althou6h very many of the smaller shocks are not so located.

2)

In the early days, say over 35 years ago in california, cnd in some parts of the United States even today, there are not oncuch seismographic stations to locate the contors of smallor chocks.

In no part of the world were scismographs used to locato e,6 cen ors before about 1885, and the instrumental location :f the epicentors of large distant earthquakes awaited the turn of the contury.

Lacking seismographs, the term opicenter, nou called field

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cnicentor, was teken as the center of greatest damage.

This loca-tion depends on the presence of st 2ctures that can be damaged, both natural (stoep slopes for landslidos, loose natural filled land and swanps to be cracked) and built by man. It depends on the geologic; foundations as well as the distance to the source of C~

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O'1 Kr. John Mattimoe March 25, 1W8 l

the wavoc.

A cource in the mountaino utu ally produces the greatect demago in adjacent alluvial valleys so the field opicenter does not lie on a fault even if that is the source of the waves.

Since there is a tendency now for non-geologists to draw sup-pocod faults on maps through opicenters, we must supply one map chouing the inctrumental opicontorc, on which those men may work, and another for the "centor of greatest damago epicenters" sinich are not cupposed to lie on faults by any theory.

On the firct map we plot circles for inctrumental epicenterc, and by each the year of the chock and its magnitude in Arabic numarcic.

On the second map we designato the contor of groatoot chd.ing by a Roman numeral, indicating the Modified Hercalli Intensity thero and also the year of the shock.

Tho construction of the cocond map requires somewhat more than conculting the Earthquako History of the United Statos (U.S.C.& G.S.)

beccuce in the early days Captcin IIeck and others having only inten-city data vore inclinod to "round out" the latitudos and longitudes of their ficld epicenters.

Thus too many lay at intornoctionc of the even dogroo parallels and moridianc-an examplo from our map i= the carthquako of April 10, 1881, in which the catalog gives Modecto ac having the groatest intensity although the History puts it half a dogrec north.

(The reports suggest strongly that this shock centered in tho Coast Hanges.)

Yours sincerely,

?ous Byerly oc Mr. Cole H. McClure, Jr.

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