ML20235A582

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PG&E Bodega Bay Reactor, Summarizing 630717 Visit to Proposed Site
ML20235A582
Person / Time
Site: 05000000, Bodega Bay
Issue date: 07/24/1963
From: Spencer G
US ATOMIC ENERGY COMMISSION (AEC)
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FOIA-85-665 NUDOCS 8709230347
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4 3-7 U. S. ATOMIC ENERGY CO MISSION REGION V DIVISION OF COMPLIANCE By: G. S. Spencer, Reactor Inspector July 24, 1963 Region V, Division of Compliance a7q

Title:

PACIFIC CAS AND ELECTRIC COMPANY - BODEGA BAY REACTOR DOCKET NO. 50-205 4

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The proposed site of the Pacific Gas and Electric Company's Bodega Bay Reactor,

7. Bodega, California, was visited on July 17, 1963. The purpose of the visit 4- was to accompany and observe the activities of the U. S. Geological Survey

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team assigned to study and evaluate the excavated areas of the site for J -

evidence of seismic faulting.

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A 180-ft, square by 20-ft, deep excavation around the proposed reactor center line had progressed to 5 feet above mean low water level. Examination of

[. the west and east faces of the excavation indicated that the relationship F~ between the weathered quartz diorite observed in the north face and the Lf; well-bedded clay-sand sediment in the south face was one of gradual tran-y' sition rather than a distinct demarcation due to faulting.

g 4 Abundant faults were observed in the weathered quartz diorite exposed on L the north face of the excavation from elevation +5 to the top of the face F

'l' (clevation +25). The faults had offsets from approximately 2 inches to 2 feet as revealed by the offset and displacement of pegmatite dikes and b, clay containing gouges. The age of the quartz diorite is considered to r be on the order of several millions of years in contrast to the considerably

'f younger age (tens to possibly hundreds of thousands of years) of the over-lying sediment. Examination of the overlying sediment from elevation +5 ft.

in the reactor hole area to the top of the face of the main yard excavation

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at elevation +50 ft. revealed no evidence of high angle faulting in the vicinity of the reactor hole. The sediments observed during this visit were approximately 45 feet lower than the sedimentary layers examined on a previous visit by the U. S. Geological Survey team, and which had been age dated (by Carbon-14 method) at 38,000 years.

In the opinion of the U. S. Geological Survey team, there was no evidence of nearly vertical or steep faults occurring in the past 38,000 or possibly 50,000 years. However, since the existence of low angle faults cannot be determined *mtil the reactor hole is dug deeper, the U. S.

', geologists plan to examine the e avation as it progresses down to the

-73 foot level.

8709230347 851217 I PDR FOIA FIRESTOBS-665 PDR

2 IbasMLry (continued)

Dye tests to evaluate the mixing action of the ocean in the proposed vicinity of the affluent outfall were started in March 1963. One hundred hour dye runs are conducted once a month and water samples collected at 10 different locations. Analyses of the samples are performed in PG&E's locally established laboratory.

DETAILS f I. Scone of Visit E

[ On July 17, 1963, G. S. Spencer and R. R. Engelkan, Region V, Division

- of Compliance, accompanied two geologists from the U. S. Geological Survey,

. Engineering Geology Branch, Menlo Park, California on a visit to the

{i ~ proposed site of the Pacific Gas and Electric Company's Bodega Bay Reactor, L,

f Eodega Bay, California. The U. S. Geological Survey team was assigned to study and evaluate the excavated areas of the site for evidence of seismic faulting. The visit included:

[ a. Observation of the activities and methods employed by the U. S.

p geologists in conducting their study.

b. Discussion concerning the seismic and geological history as well r as. the current observations and findings relative to the seismic

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activity of the site with both Federal and several State geologists also present at the site.

c. Observation of dye tests in progress at the proposed location of the effluent outfall.
d. A visit to PG&E's locally established laboratory where the dye samples are analyzed.

e kJ Principal contacts during the visit were:

Mr. J. Schlocker - Geologist, U. S. Geological Survey Mr. M. G. Bonilla - Geologist, U. S. Geological Survey Mr. J. B. Koenig - Geologist, Calif. State Div. of Mines & Geology Mr. S. J. Rice - Geologist, Calif. State Div. of Mines & Geology Mr. F. Mautz - Chief Engineer, PG&E Mr. C. Joslin - Construction Supt., PG&E (continued)

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II. Results of Visit A. Status of Site Preparation _.

Mr. Schlocker stated that the north, west and south faces of the  ;

site excavation were essentially completed, and that the floor of the ex-cavation was approximately 25 feet above mean low water level. A 180 ft.

square ho!, around the proposed reactor center line had been excavated

"~1 from the floor level (elevation +25') down to elevation +5 ft. The north, west, and east faces of the reactor hole were sloping and the south face 1 nearly vertical. Mr. Schlocker said that his objective during this visit I was to examine the exposed well-bedded sediment and weathered quarts j diorite overlying the solid granite formation more thoroughly, by having i the faces of the reactor hole excavation washed off. He explained that during L

his previous visit he had observed stratified sediment in the south face s exposure, whereas the north face had the appearance of weathered decomposed k- diorite. He said that by washing off the west and east faces of the l p_ excavation, he hoped to be able to see the relationship between the i r, materials in the north and south faces and to determine whether the j F

transition was gradual or a distinct demarcation due to faulting.

B. Examination of the Excavation Following washdown of the reactor hole excavation faces, the inspectors accompanied Messrs. Schlocker and Bonilla down to the +5 ft.

h elevation where the following observations were made, as pointed out by the U. S. geologists.

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Weathered quarts diorite was exposed from the bottom to the top of the north face of the reactor hole. At the bottom of the excavation  ;

(elevation +5 ft.) it appeared 6 ft. east of the proposed center line of l

V" g" the reactor, rose to the top of the face (elevation +25 ft.) and continued

' over to the east end of the north face. Abundant faults were observed in

! the quartz diorite. The faults were marked by clay souge sones - 2 inches thick, although some appeared to be clean breaks with no gouge at all. The faults had offsets from approximately 2 inches to 2 feet as revealed by the displacement of pegmatite' dikes and the clay containing gouges Or unta-tion of the faults varied from due east-west to due north-south, dipping

_.J east and south. The weathered quarts diorite appeared to be moderately sound incompressible material, according to Schlocker. At the west half of the north face the quartz diorite graded into residual soil (green-gray sandy clay), 4 - 6 ft. thick lying of the quarts diorite. This appeared to grade into washed soil on the west end, gradually losing its weathered rock characteristics with sediment interbedded with fairly clean sand.

(continued)

~4- l Results of Visit (continued)

The south face consisted of well-bedded reddish-brown clay sand sediment. Examination of the west face of the excavation, indicated that the reddish-brown clay sand observed on the south face was interbedded with the more massive greenish-gray clay sands exposed on the north face. On the east face of the excavation, the reddish-brown clay sand from the south face appeared to be interbedded with gray material exposed at the north and of the east face. There was no evidence of faulting on the east face, acc.ording to Schlocker.

C. Tentative Findings Tentative conclusions reached by Schlocker and Bonilla following their examination of the site appeared to be as follows:

1. Examination of the west and east faces of the excavation indicated that the relationship between the weathered quartz diorite observed in the north face and the well-bedded clay 6and sediment in the south face, was one of gradual transition rather than a distinct debarkation due to faulting.
2. Examination of the overlying sediment from elevation +5

- . ft. in the reactor hole area to the top of the face of the d main yard excavation at elevation +50 ft., revealed no evidence of high angle faulting in the vicinity of the

- rasctor hole. The sediments observed during this visit y

were approximately 45 feet lower than the sedimentary layers examined on a previous visit by Schlocker and Bonilla.

A The sediments examined during the previous visit were '

' radiometrically dated (by Carbon-14 method) to be 38,000 years old.

3. There was no evidence of nearly vertical or steep faults occurring in the past 38,000 or possibly 50,000 years.

However, since the existence of low angle faults cannot J be determined until the reactor hole is dug deeper, Schlocker and Bonilla plan to examine the excavation as it progresses down to the -73 ft. level. The U. S. geologists also expressed the opinion that high angle faulting cannot be entirely ruled out yet until the excavation progresses deeper into older sediment. However, the older sediments will not be older than the quarte diorite.

(continued)

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y Results of Visit (continued)

D. Discussion With State Geolonists -

f Mr. J. B. Koenig and Mr. S. J. Rice, geologists with the California State Division of Mines and Geology, were also present at the site during the time of the visit. Judging from discussions between the Federsi and State geologists present, and independent discussions the inspectors had y , with the State geologists, there appeared to be substantial agreement between the geologists from both governmental agencies regarding their findings. ,

l E. Oceanorrschic Studies g- The inspectors accompanied Mr. Fred Mautz, Chief Engineer for E PG&E, to the proposed location of the reactor effluent discharge on the P ocean side of Bodega Head, to observe a dye test in progrees. The dye (Rhodamine B) was being pumped into the~ ocean at a point where the water b enters a cove in which the effluent outfall will be located. hr. Mautz stated that 100 hour0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> runs are conducted once a month, and that the'first l

' run had been initiated during Mn ch 1963. He said that PG&E had hired several boats for the purpose of collecting water samples at 10 different ,i locations. Some of the sampling stations are located out in the ocean y area and some within Bodoga Harbor, according to Hautz. The inspectors were also shown through a laboratory which PG&E has established near the  !

f-b town of Bodega, in which fluorometric analyses for dye concentration and )

r salinity tests are performed on the collected samples. A cursory exam- )

ination of the analytical data sheets indicated that fluorometric detection sensitivities in the range of 0.1 part per billion were being obtained. .

,j Also observed in the laboratory storeroom were drif t poles, which Mr. Mautz  !

said were used to study the ocean currents in the vicinity of Bodega Head, g Mr. Hautz stated that in addition to the oceanographic studies, a continuing L survey of the ecology of Bodega Head, Bodega Harbor, and vicinity is a being conducted under the direction of Dr. Ernest Salo, of Humboldt State College, the Company's consultant on Oceanography and Marine Biology.

According to Mautz, these studies will be continued for a period of two years as required by the State Public Utilities Commission. Dr. Salo d was present at the site during the visit by the inspectors.

F. Construction Activities It was observed that construction activities vera confined to those described in the previous report dated March 26, 1963 and that these activities were consistent with provisions of 10 CFR 50.10(b).

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