ML17276B035

Forwards Responses to Questions 371.019 & 371.020 from Hydrologic Engineering Branch Review for Incorporation in Amend 24 to FSAR

ML17276B035
Person / Time
Site:	Columbia
Issue date:	01/28/1982
From:	Bouchey G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Schwencer A Office of Nuclear Reactor Regulation
References
GO2-82-119, NUDOCS 8202030160
Download: ML17276B035 (6)

Text

REGULATORY 'RMATION DI'STRIBUTION "SYS iI, (RIDS)

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'AOCE.'SSION NBR:8202030160 OOC.DATE: 82/01/08 NOTARI'ZED! NO DOCKET 0 FAOIL:50 '397 'NPPSS Nuclear <<Pro j eet i Uni't 2~ Nashing ton IPub1 i c:Powe 05000397 "AUTH,NAME AUTHOR "AFFILIATION

.BOUCHEY<G,D, Washington 'Public 'Power 'Supply "System

<<RE<<CIP,NAME RECIPIENT AFFIL'IATION SCHKENCERgA, Opet ating Reactor s Branch 2

SUBJECT:

Forwards nesponses to Questions <<371 ~ 019 <<'8 371o020 from Hydrologic Engineering Branch review'for <<inconporation in Amend 24 'to <<FSAR>

DISTRIBUTION 'CODE! <<B00]'8 )COPIES >RECEIVED! LT<<R, 'ENCL ~ SI'ZEo,-

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8202030ih0 820i28 PDR ADOCK 05000397 A PDR Washington Public Power Supply System P.O. Box 968 3000 George Washington Way Richland, Washington 99352 (509) 372-5000 January 28,1982 G02-82-119 Docket No. 50-397 RECEÃEO Mr. A. Schwencer, Chief Licensing Branch No. 2 FEB 31982~

Division of Licensing 9 Ngm~m p~

@gag 555%5 N U.S. Nuclear Regulatory Commission lloC Washington, D.C. 20555 C

Subject:

NUCLEAR PROJECT NO. 2 HYDROLOGIC ENGINEERING SAFETY QUESTIONS

Reference:

Letter, A. Schwencer to R. L. Ferguson, "WNP-2 FSAR Request for Additional Information", dated November 4, 1981 Enclosed are sixty (60) copies of Questions 371.019 and 371.020 which were transmitted in the referenced letter. This completes the responses from the Hydrologic Engineering Branch review. They will be incorporated in Amendment 24 of the WNP-2 FSAR.

Very truly yours, G. D. Bouchey Deputy Director, Safety and Security KSN/kp Enclosures cc: R Auluck - NRC WS Chin - BPA R Feil - NRC Site

I, II l

11 11 II

Q. 371- 019 Provide the leakage rates that were determined during initial t e" I i <>s) O f I tl< S~I< iy p<I<l<IS... !LOW <IO t h< Sf ra t eS COrnp Ire W i t'h Ills.' sl f ff S u'ss'd I ll f I<<'fe'I f f I! I I e'I I lldy . l <'IIV I<I<Ill el<<el I yll I" l II I show t tie m'Ix i<<luff< 9I'oull(jwa l<. I s<s a l LI< I.'! of'ne I' f Ladle di esel

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generator building that would resul t from the maximum Leakage rate obse'rved during preliminary testing o f the spray ponds.

Provide the permeability and speci fic yield (effective porosity) of the compacted plant fiLL and other parameters used in your analysis. Since more than one aqui fer (plant ivi fill and glacio-appropr iate.

f Luvi at) is involvedr a sensi t ty study <night be

~Re s on s e:

Spray pond Leakage rates were'documented in a Letter dated October 1i 1981m (R.G. Matlocki Supply System to R.H. Engelkenr NRCr G02-81-0325'Potentially Reportable Condition. on Spray Pond Leakage" ). These rates are 40 gpm for pond 1A and 80 gpm for pond 1B.

The Battelle study (Reference 2.4-7a) concluded that an unlined cooling pond east of WNP-2 could have an ini tial seepage Loss rate of 400r000 gpm per square mile. For the combined spray pond area of 0.0045, square miler this is equivalent to a Leakage rate of 1800 gpm which may be compared with the reported Leakage of 120 gpm. The study included the evaluation of several hypo" thetical ponds of various sizes and equilibrium Leakage rates of up to 10i000 gpm. Under the ex treme condi tion studied ground-water mounding under the ponds was predicted to be about 50 ft.

Seepage of about 1000 gpm from a 1 1/2 square mile pond was calculated to raise the water table 4 ft. Another Battelle study (Reference 2.4-7b) estimated that the continuous discharge of 2700 gpm o'f cooling tower blowdown to the depression ea'st of WNP-2 could resul t in about a 20 ft. rise in the water table. beneath the point of discharge. These studies used Laboratory permeabilities (average 13 ft/day) to which a correction factor of 10 was applied to derive representative field permeabilities-The bottom of the spray ponds are at 417 ft. MSL and the bottom of the diesel. generator foundat ion is at 434.3 f t. MSL. As indicated by Figure 2.4-28m the unconfined water table at WNP-2 is about 380 ft. MSL. The design basis groundwater Level based on the possibles but highLy unlikely'onstruction of Ben Franklin Dam is 420 ft. MSL. Figure 2.4-26 shows the most recent estimate of the water table at WNP-2 with the dam could be below 405 ft.

MSL. Since the foundations are weLL above the actual groundwater elevation or the hypothetical elevation of 405 ft. MSLr the spray ponds and the diesel generator building wiLL be unaffected by hydrostatic forces due to groundwater.

MNP-2 An anal ys i s has not b'een per formed to de te rmi ne the groundwater r i se a t the corner o f the diesel generator bui t ding. It may be in(i r <~ d from I lie "t udie

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c i ted above that a leakage rate of 120 gpm would result in a negligible rise in the groundwater Level. As noted in the Letter referenced above'he corrective action is being taken to eliminate this Leakage.