ML20209C591

Informs of Hydrologic Engineering Section Review of Listed Sections of Des.Sections Acceptable Subj to Minor Changes. Recommended Changes Encl

ML20209C591
Person / Time
Site:	Satsop
Issue date:	11/08/1983
From:	Johnston W Office of Nuclear Reactor Regulation
To:	Novak T Office of Nuclear Reactor Regulation
References
CON-WNP-1470 NUDOCS 8311160222
Download: ML20209C591 (10)

Text

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NOV 8 1983 Docket No. 50-508 MEMORANDUM FOR: Thomas M. Novak, Assistant Director for Licensing, DL .

FROM: William V. Johnston, Assistant Director Materials Chemical & Environmental Technology, DE

SUBJECT:

HYDROLOGIC ENGINEERING REVIEW OF THE DES 1

Plant Name: Washington Public Power Supply System - Nuclear Project

No. 3 (WNP-3) ~

Licensing Stage: OL Responsible Branch: Licensing Branch No. 3. Annette Vietti, PM Requested Completion Date: November 8,1983 As requested in your memorandum of October 28, 1983, the liydrologic Engineering Section has reviewed the portions of the WNP-3 DES for which input was provided.

More specifically, the following sections were reviewed:

4.3.1.1.1 Surface Water 4.3.1.1.2 Ground Water 4.3.1.1.31 Suppiementary Water Supply 4.3.1.2.1 Regional Water Use 4.3.1.2.2 Plant Water Use 5.3.2 Water Use 5.3.3 Other Kydrologic Impacts l 5.9.4.5(5) Releases to Groundwater We find these sections acceptable subject to some minor changes which we have identified on the attached pages.

This review was perfomed by R. Gonzales who can be reached at extension 28018.

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/Y William V. Johnston, Assistant Director 1116o222g$$$$8 ADock 05 Materials, Chemical & Environmental

( N // f Technology M)ff ' Division of Engineering

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quantity of each principal radionuclide expected to be released annually to unrestricted areas in liquid and gaseous effluents produced during normal reactor operations, including anticipated operational occurrences. .

The staff's detailed evaluation of the radwaste systems and the capability of these systems to meet the requirements of Appendix I will be presented in Chapter 11 of the staff's Safety Evaluation Report, which is scheduled to be

,. issued in August 1984. The quantities of radioactive material that the staff calculates will be released from the plant during normal operations, including anticipated operational occurrences, are in Appendix 0 of this environmental statement, along with examples of the calculated doses to individual members of the public and to the general population resulting from these effluent quantities.

The staff's detailed evaluation of the solid radwaste system and its capability to . accommodate the solid wastes expected during normal operations, including anticipated operational occurrences, is in Chapter 11 of the SER.

As part of the operating license for this facility, the NRC will require Tech-nical Specifications that limit release rates for radioactive material in liquid and gaseous effluents and that require routine monitoring and measurement of all principal release points to ensure that the facility operates in conformance with the radiation-dose-design objectives of Appendix I.

4.2.6 Nonradioactive Waste Management System _

(Samworth to supply) 4.2.7 Power Transmission System The transmission facilities included in the scope of this review consist of a 500-kV above ground line and a 230-kV underground low pressure oil-filled cable, each connecting the plant island to a Bonneville Power Amdinistration (BPA) sub- ,

station on the site. The single right-of-way for these lines is approximately 1476 m (4841 feet) long, lies completely within the site, and crosses no public

- roads (ER-OL, RQ 290.12 and accompanying figure). The 500-kV line will be sus-pended from la.ttice steel, single-circuit delta towers about 37 m (120 feet) high and 12 m (40 feet) wide. The system beyond the WNP-3 substation was eval-uated, designed, and built by BPA. '

4.3 Prefect-Related Environmental Desc.riptions 4.3.1 Hydrology

! 4.3.1.1 Hydrologic Description 4.3.1.1.1 Surface Water i.

The surface water descriptions in Section 2.5 of the FES-CP are still valid In addition, withtheinc1gsionofthenewinformationanddiscussionsbelow.

Section 5.3.'2 of this report addresses the hydrologic effects of alterations /

in the floodplain in response to Executive Order 11988, Floodplain Management, /--

and Section 5.9 contains the analysis of . severe liquid pathway accidents.

WNP-3 DES 4-11 i

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The WNP-3 site is located in the hills just south of the Chehalis River, the major drainage system in Grays Harbor County and one of the major drainage bacins in West Central Washington. The total drainage area of the Chehalis .

Rivar basin is approximately 5440 km 2 (2100 mi2). The stretch of the river from its mouth at Grays Harbor to the vicinity of the site (about 32 km (20 miles)) is tidal. Figure 4.5 is a map of the Chehalis River basin.

The Chehalis River flows generally eastward to the city of Chehalis where its bB changes course abruptly to the north. From near Grand Mound, about 16 kmenorth '

of. Chehalts, the river flows northwesterly to Elma then west co Grays Harbor at Aberdeen. The major tributaries of the Chehalis in the vicinity of the site are the Satsop and Wynocchee Rivers. The Satsop River has a drainage area of 777 km2 (300 mi2) and an estimate average annual flow of about 57.5 m3/sec (2030 ft3/sec). The Wynocchee River has a drainage area of 259 km2 (100 mi2) and an estimated average flow of about 34.0 m 3 /sec (1200 ft3 /sec). Figure 4.6 shows the surface hydrologic features in the vicinity of the plant site.

The long-term average flow of the Chehalis River at the site just downstream of the S:tsop confluence is estimated to be 193 m3 /sec (6824 ft3/sec); the average flows in the Chehalis and Satsop Rivers above their confluence are about 3

133 m /sec (4680 ft3 /sec) and 57.5 m 3

/sec (2030 ft3 /sec), respectively. The estimated3 average monthly flows in the Chehalis River at the site vary from 20.7 m /sec (730 ft3/sec) in August to 422 m3 /sec (14,900 ft 3/sec) in January (ER-01., Section 2.4.1); this variability reflects the seasonal rainfall distri-bution within the basin. The once-in-10 year, 7-day-duration low flow is esti-3 mated to be about 15.0 m /sec (530 ft3 /sec). The minimum and maximum historical flows at3 the site have been estimated by the applicant to be 11.2 m3 /sec 3

(397 ft /sec) and 2750 m /sec (97,100 ft3 /sec), respectively.

The Chehalis River channel in the vicinity of the ' site is about 76.2 m (250 feet) wide and varies in depth from approximately 0.3 m (1 foot) during low flow to greater than 10 m (30 feet) during flooding conditions. The average river bed elevation ranges from about 16.8 m (55 feet) below mean sea level (msl) near the mouth to 5.8 m'(19 feet) above msl about 16 kmVu pstream of the site.

(lornifes)I The velocity characteristics of the Chehalis River are quit, variable. During low flow conditions (11.3 m 3 /sec (400 ft3 /sec)), velocities of about 0.1 m/sec (0.4 fps) are experienced, whereas during flood flow conditions (850 m3 /sec (30,000 ft3/sec)) channel velocities reach 1.8 to 2.1 m/sec (6 to 7 fps). In addition to fresh water flow conditions, the site hydrology is influenced to '

some extent by ocean tides. Flow reversals of the Chehalis River are known to occur several miles upstream from Montesano over most of the range of discharge; on the other hand, salt water intrusion is known to extend only a short distance upstream from the Montesano highway bridge and only during low flow conditions.

Plant grade elevation is about 119 m (390 feet) msl, which is about 113 m (370 feet) above the normal water level of the Chehalis River. Five streams,

. all relatively short and intermittent, crain at least some portion of the site.

These include Workman, Purgatory, Fuller, Hyatt, and Elizabeth Creeks. Purga-tory and Fuller Creeks were significantly altered by site-erosion-control-runoff-treatment-measures during site construction. Hyatt Creek and Elizabeth Creek were directly influenced by plant construction. All of these creeks have --

also been altered by lumbering activities which have altered their watersheds.

WNP-3 DES 4-12

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Table 4.1 shows the characteristics of streams within the influence of the site.

Table 4.1 Characteristics of streams at WNP-3 site Watershed area Watershed area Total within plant clearcut from watershed construction 1965 - 1977 Length area Stream (feet) (acres) (acres) (%) (acres) (%)

.. Workman 48,000 7,090 61 1.1 2,690 37.9 Stein 6,700 360 41 11.7 40 11.1 Purgatory 7,000 320 13 37.5 130 40.6 Fuller 12,300 720 23 33.3 220 30.6 Hyatt 10,000 540 6 11.1 260 48.1 Elizabeth 21,000 2,730 10 0.4 520 19.0.

Source: ER-OL Table 2.4-3.

lh tut 4.3.1.1.2 Groundwater '4 u.v 6 g g)lp. 7w&

W e-4,ekC4 The only satisfactory source of groundwater in the vicinity of the site is in n.v  %

the sand and gravel aquifers in the Chehalis River valley. These coarse - 3, alluvial deposits are up to 61 m (200 feet) thick,'and their yields range from 6.BGif.4m/ ink (200to3000opml Lower yield sources of groundwater occur in the Pleistocene "

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terrace deposits north of the site. The groundwater in these unconsolidated terrace deposits occurs in pockets of permeable sands and silty sands having low yield; it is adequate only for domestic uses.

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l A compilation of data for' wells within 3 ano 32 km (2 and 20 miles) of the site is in ER-OL Tables 2.1.12 and 2.1.13. Most of these wells are north of the site because the population density is very low in other directions. The wells are relatively shallow 30 m (100 feet), yielding a few hundred op_rn; they are used for irrigation and/or domestic purposes. The only major consumer of groundwater in the area is the town of Elma 6 km (4 miles) northeast of the plant, which can withdraw up (t9/2000 cod. The nearest well to the plant is about 8045 km (5000 feet) to the' north-northwest. ,

"7. Gad /m',s l Water for plant operations is produced from two Ranney well collectors located l at about river mile 18. About 88% of the water collected by the Ranney wells comes from the Chehalis River via infiltration; the rest comes from groundwater in the alluvial valley fill. A single well is capable of supplying the total plantneedsofabout/18,000opml '

L8.t m 3/ min 4.3.1.1.3 Supplemental' Water Supply The plant is permitted by the State of Washington to withdraw from its Ranney wells up to(52,000,000 opd)on a daily basis, and(48,500,000 cod) on a 30-day

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WNP-3 DES 4-15 D

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3 average basis. Withdrawal may not exceed 2.2 3m /sec (80 ft /sec) instantane-in addition, it may not exceed the difference between3 the river flow 3 and 3mh,ously;3/secl When Chehalis River flows are less than 15.6 m /sec 3

(550 ft /sec),'

e. '550 f t s normal withdrawals must cease, except that up to 0.1 m /sec (2 3

ft /sec) mayhas be The applicant withdrawn to maintain the plant in a hot standby condition.

3 also made provision to purchase up to 1.8 3m /sec (62 ft /sec) of water from the City of Aberdeen's Wynocchee Reservoir toHowever, supplementthis flow water inwould the Chehalis not be River used below the plant during low flow periods.

by the plant and would not significantly benefit the Chehalis River near the plant or upstream.

4.3.1.2 Water Use 4.3.1.2.1 Regional Water Use The water resources of the Chehalis River Valley include both ground and sur-face supplies. More than half of the water used'in Grays Harbor County is for irrigation. Water use is controlled by certificate or permit issued by the Within 8 km (5 miles) of'the site, Washington State Department of Ecology.

surface water permits have been granted to about 78 users for a combined water use of up to 0.7 m 3 /sec (23 ft3 /sec), mostly for irrigation, with the remainder for domestic, livestock' watering, fish propagation, fire protection, and indus-trial uses. There are no known drinking water users drawing from Chehalis River surface supplies downstream from the plant.

Groundwater wells in the Chehalis River Valley are relatively shallow, usually less than 3 m (10 feet) in depth. Most of the wells are located on the flood-plain deposits north of the river. There are 45 known wells withinFive 3.2 major km (2 miles) of the plant, used mostly for drinking and irrigation.

municipal water systems within 32 km (20 miles) .of the site are served partially or totally by groundwater. Some of these systems, notably Montesano and Central Park, may draw on groundwater in contact with the Chehalis R of water, if any, that might infiltrate from the Chehalis River to the wells.

1. 4.3.1.2.2 Plant Water Use The water use for the plant has changed significantly since issuance of the FES-CP, primarily becsuse of cancellation of WNP-5.

Total water withdrawal of 1

about 1.1 m 3 /sec (40 ft 3 /sec) is anticipated for full pcwer single-unit opera-3 tion; of this 0.9 m /sec (32 ft /sec) 3 will be used ccasumptively, down fromAvSrcoe daily the estimated 2.1 m 3 /sec (72.5 ft3 /sec) for two-unit operation. 3 3

withdrawal will be about 1.0 m3 /sec (35 ft /sec), of which about 0.8 m /sec (28 ft 3/sec) will be used consumptively. Piant water use is shown in

Figure 4.2 above.

4.3.2 Water Quality (Samworth to provide) 4.3.3 Meteorology _ . .

WNP-3 is situated in western Washington State where the climate is compr of warm, dry summers and wet, mild winters.

f 4-16 I WNP-3 DES

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water users on the Chehalis River downstream from the plant. Small wells for private use located near the river probably are not supplied by water from the river. Some larger central supply wells for municipal water are located along. '

the Chehalis River and might be withdrawing some river water. The staff could not estimate the fraction, if any, of river water constituting these supplies.

Populations served are small compared to the LPGS case, so the contribution to dose from this potential pathway was not taken into consideration.

The staff used the applicant's estimate of 2.8 x 105 user hours per year for shoreline recreactional use along the Chehalis River and Grays Harbor from Chehalis River Mile 21 to the Pacific Ocean, which was based on the average data used in the LPGS. Exposure to persons swimming is only a minor pathway and is considered to be part of the shoreline exposure dose. The shoreline usage is conservative for the present site in light of the local population density and usage habits of the populace of Grays Harbor County.

Annual average commercial and recreational fish catch was estimated by the staff to be aboutT4.6 x 10s kilograms} per year in the Chehalis River and Grays Harbor.

This figure does not include the catch in the ocean or major tributaries, but includes the river upstream from the site.

l.0 Y/0 6p u dS Because Grays Harbor and the lower Chehalis River are tidal, fish bioaccumula-tion factors (BAF) for the radionuclides would be typical of both fresh and salt water. Average BAFs of 3.5 for Sr-90 and 220 for Cs-134 and Cs-137, which are midway between the LPGS values for fresh and salt water, were used in the analy-sis of populati'on dose from fish consumption.

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The annual average flow rate past the site was estimated using the U.S. Geological Survey WATSTORE system to b 824 ft3/ sect based on approximately 30 years of record on the Chehalis River at Porter, WA, and 55 years of data on the Satsop River near Satsop, WA, adjusted for drainage basin areas at the site. The

" dilution" flow, whichV is based on a harmonic mean flow rate, is considerably 33 smaller, estimated as (1871 ft3 /secl and is considered to be a representat flow rate for th river from the site to the ocean, a distance of about 1 milesl

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h-n the latter flow rate wk.ie is used in the dose calculations for this site.

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Flow rate and fish catch for the LPGS site varied with distance from the site for the small river case and included a much longer stretch of major U.S. rivers (Tennessee, Ohio, and Mississippi Rivers).

Factoring dilution, fish catch, BAF, shoreline usage, and the fraction of radio-nuclides released from the plant indicate that the WNP-3 dose would be a factor of 190 times larger for the fish consua.ption pathway, and 70% as large as the LPGS shoreline exposure dose for a sump water release. Because the staff assumed that there would be no drinking water pathway in the WNP-3 case, the ratio for l this factor is 0. In the corresponding LPGS case, about 7% of the total whole l body dose was from the fish consumption pathway, 14% from shoreline exposure, and 79% from drinking water. Based upon these factors, the ratio of total population

. doses for the WNP-3 and LPGS sites would be a factor of about 14.

The above dose comparison does not consider mitigative measures or probabilities that such a release could, in fact, occur. A sump water release is much less --

likely than other types of releases of radioactivity from the core of a nuclear WNP-3 DES 5-51

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