ML20198G455

Summary of 750225 Meeting W/Wppss & Ebasco in Bethesda,Md, to Discuss Groundwater Drainage Sys

ML20198G455
Person / Time
Site:	Satsop
Issue date:	03/13/1975
From:	Oreilly P Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
CON-WNP-1310 NUDOCS 8605290601
Download: ML20198G455 (5)

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fan 131S5 511 SC-Sor aro kcchinrtoc Public Power fupply Syrte- . (6.tygs) ti"8Fe systen war M'Sf 1.uclear Prcject s ro.

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fatM Y 25. 1975 be sbort into the hfITI% LIn Vppsr kiCAtLIK GECNNDW T -

A EF LRAll4GE 5, IC75. Terrescot&tiws of seda. EPPSI ard ! bas 11 t.c chone throute WFPSb hav rec ucated whater trainoec sys;ter the for ecct tucl bFl:C inr it. co set with the FTC ct cttendecc it, . order to discuse the attached. ear Projects I;o. 3 and ,

ti e tunnel will h ir ter ior. T h ef'

• od c brief descrirtion of the site area Litete visuel inspectict buildirr.s (ece f or each crit ) et and the locaticn cf tte o dypI4 5f.ed tlt.t the CunceJt of the site. In introductory crecreetly lover the croundwater level atthe prcunc'k&ter draIDaRe et.d repairable c c' ir ti.e loI IOTr i"P the cystei shouldgravity dreir.ere the site etith level suel fail. Ecaece claioed that cech Category systcc around cre a Icrr tire toexcee:'e recever that the syste:r it will take te drilld ""' ""i"I the proundwater level cco stren, et veter.

the decise level.

the freundwater drainare rystee Art the followitet evert water from seerie,s throurt tr.e ulctions of the effec M foundation walls, ability for the reci cf a rair f r 11 percolat10"

'.ieve fee walle of hdrostatic loaci er. U*

reve stability conditiers under earthot ah loadic r.

recse sloe frictice on ene tictis, g g,y Ebsere see cuantities reeovec durint exceva t f or. .

ilcate outside fort:s ou the .

walls and uter prooting.

In ne cv; the tion, bac) fill detween the wall and the rock f ace of 'I'* *

• ibed tne groundwater drainate syste .

suaed f or inpermeable rock.

)sied at F. 5 f t .

nine cxtend fren plantintervele trade arounc the CateFory ngs.

I buildi1he avstee consiste of concet t la ther to tre base of the foundation with ac F ir. borizontel header which b th urits etreuted vis -achc!re te a 6 f t, diaireter drainase e collects thec unlikel) .

• clair tu.* tecility) that draiae itto Workean Creek p ger if tre dra it's ? t' """I o

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Tbasco stated that total failure of the drainage syster would restle in the Rroundwater level risicg from the pottom of the foundation nat to 2C ft.

above t he bot t om of t he mat in a period ranging f rom one month to 3-1/2 yesrs.

The one mor.th estimate was calculated assuminr a perocability of C.5 x Indi ce/sec and a rainf all percolation of I-2/3 in. per month. The 3-1/2 year estieste was calculated assuninr the save permeability but no rainfall perec1stion.

Ebanco described how the drainage systen it prctected from t 'i e tellcwirr harard?:

(1) !;stural phenorene (a) Finod free heevy reir - tne grocnd slopes away f rae the raterorv I buildings and will route the water to the site store drains. Any rain water er.terine tbc rround will drain thrcuch the preurdwater dreirage system.

(b) Earthouc'r ee - the eroordwater draitare system is not Category 2.

(c) Tornedo - the proundwater drainare syster is entirely below .-r4de.

(2) Accidental phencerne (e) Coeline water pire brer.i icside a Catercry 1 buileirr - the cruero-water syster is iselst ed by the walls of t r.t buildinr.

(b) Ccclin- water pipe break outside the Ceterorv I buildire - pirce a re seperated fror orainare syster. by rock, besultier water vill drair te site store dreirs.

At our request , Ebasco described the tests perf orr.ed to obteir tbc u rseabilities used in the desitn analysis. The guestion of whether the systen should be classified as Category I was discussec. Assuming that the systec is rot classified Category I and fails, the time required for repairs was theo dis-cussed, i We stated the following contenta about tne proposed groundwater drainage system:

(1) At least the eenholer in the syster. should be classified as Catecory 1.

(2) l'os t ule t ed failures of outlets should te addressed.

(3) Insrectice procedures should be clearly establisheti. Croundwater level cutside building should be e,onitored durint construction and s i s( during the operating life et the plant . kith such a monitorine prorro_,

defiritive interration about Troundvater level cherecterist ics will Le available betore the operating l icen se. stare.

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M G * '? 1975 (4) Adeenate capacity of the systee should be assured by pu=pinr test dcte.

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(5) Timely repair capability should be assured, This is related to (4) above.

kFPSS stated that the details of't'he troundwater drainage system would be submitted with the resporser to the staf f's second round of requests for additional inferaation.

Original Si.med by Patrick D. C .';my Patrick D. C'P.rilly (

LI Fht Water Recctors Project tracch I-3 r.ivis tor of I:cactor Licerrier inclosures Atter.darce List ec: sec pere 5 i

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.cc: Washington Public Power Supply System

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.f ATTN; Mr. J. J. Stein "i Managing Director

' *_ 3000 George Washington Way s; - Richland. Washington 99352 N7 Joseph B. Knotts. Jr., Esq,.

Conner,'Hadlock & Knotts 1747. Pennsylvania Avenue, N. W.

lf; , Washington, D, C. 20006

' RicM rd Q. Quigley, Esq.

Washington Public Power Supply System

'3000 George Washington Way Richland,' Washington 99352

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ENCLOS.U.R.E ATTENDANCE._ LIST FEBRUARY 25, 1975 MEETING WITH WPPSS Nuclear Regul_atogConr:nission Was,hin,gton Public Power Supdy,Syst,eg F. O' Reilly D. B. Whitford

1. Sibweil G. C. Sorensen C. Y. Liang L. G. Hulman D. L. Milliken J . T. Greeves Ebasco

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D. Jeny T. Jchnson W. D. Rezak R. J. Norman A. H. Wern A. W. Barchas T. Raney