ML20210S737
| ML20210S737 | |
| Person / Time | |
|---|---|
| Site: | Satsop |
| Issue date: | 05/03/1977 |
| From: | Swanson D NRC OFFICE OF THE EXECUTIVE LEGAL DIRECTOR (OELD) |
| To: | Bournia T NRC |
| Shared Package | |
| ML20210S735 | List: |
| References | |
| CON-WNP-1630 NUDOCS 8605290379 | |
| Download: ML20210S737 (2) | |
Text
i
)
o o
May 3,1977 NOTE TO TONY BOURNIA RE:
WNP-3 & 5 HEARING This note serves to confirm what I told you yesterday in a telephone call. As I informed you, the Board Chairman for the WNP-3 & 5 hearing, in a conference call between himself, counsel for WI-PSS and the State of Washington, and my-self, announced that he was scheduling a hearing for May 24, 1977. He indi-cated that the hearing could last as long as 3 days.
The Board requested the Staff to have witnesses available on the following subjects:
1.
the derivation of the acceleration value for the seismic design of the facility; 2.
a representative of I&E's Region 5 to testify as to I&E's role in the inspection of the quality assurance plan for WNP-3 & 5 during construction; and 3.
the " component cooling water system proposed design basis for continuous cooling during operation." After further ques-tioning, the Board Chairman indicated that he wanted someone, such as the project manager for the facility, to be able to testify about the proposed cooling system for WNP-3 & 5, including the ultimate heat sink.
As to the third area of concern, apparently the Board will not question in suffi-cient detail to justify sending a technical reviewer to the hearing to testify. We will need additional witnesses for the first two subjects however.
The Board stated that it would not require written testimony for the hearing, but would prefer it. It would be in our best interest to prepare written testi-mony on the subjects.
8605290379 770506 PDR ADOCK 05000508 A
M.
- 4
)
1 Please let me know at the earliest of the availability of witnesses for subjects 1 and 2.
1 1
4
~
..Gu Daniel T. Swanson, Attorney Office of the Executive Legal Director cc:
HJMcGurren SATreby i
JANorris 4,'.
E 4
(
J l
i a
1
r---
_--.m,.
i i t g
(. '
y e
ir 1 -
DISTRIBUTION:
(
l Docket File (50-508/509)
NR Rdg.
\\
s m 2 bl37J.
DSE Rdg.
GB Rdg.
~n %_. y y p e p t. w. -
m m m$,
~
, aprgw.+e
. :a.=
lW4 t@tinD 2%:..
' U O r & % !r r*J i#a M 9 9 S % s,.%N m17.%{'
, f.e4 a o e m m?,.& 4 y wyn y v%w
,'as W ;s.x m. m[ M p M EREP A* k F. Ahasf '
yWwj Syeggg
?@%1 i W W m u te a m n r.
9.46403 f tat" v.% a. 43 -
SPm 9A c4 Mt *+- W W
. SEE 9,N
?A.iC M h3 w
- w. ww
- m. 5g c.
- r
-?
- e. s w _
annyww
.c N'
$D
-? Y
.?
-........ n,,u:;,_ag
_a.
- g :..,s, W. M. WPRStutte385 g,gagfu sym gp
'A 58.8 984 W/000
. s. g ORMW: LNR No. 3, T. Beerste l??
CBWLET!cs 3Rft: April 17, 19F? -g d g;;i.:-
it I:
t
~ /gegens)'
safety ji -i Z.
Atteshe8 to ser Sayleeset me. I to me if Stelmatten Report vaput far to WFW 3 4 5 This lesent eestates ser evaleottee of to tapest ce ear steelmatens wie roepest to es tetoste destga heats stated:te te W of.
I emelyses..
x t
of tafermettee chest the Sessaker 14. INE
. We have
- "~ ~
deterutsed that ser earlier sammlestems.ere unehenged ey to sateegeset l
emelyses.
~.
Original Glgned by' i
J. C. Stepp g
J. Carl 8
. Dief
- r-h v Motstem of site BefW s
! 9 sn@
v..
eaQWIpygggpl_ges4 ggg,_,,
M W m m esse n r wp2
.w
- wiseM % n e u u e a g[b w, IE, s.),d D.h n,%}h $ /N SikNhMM.M.
((4,Y @4%@
Iia
( d,D$
Q g y &. a m a ? ^
3 19 w, w : y uam m
a,,mnmer wmp<aa m n.ua, m n.
m w ave m emensioness w e reem 2
- nq q'hA
<h
.Wie si 't e f
4 f, e ?she
.E, OREslll. eh tu c'; W M M 'r h w ;d_T4 I
'> cf WW.
3 g4. 6[K e
s L
. vd.
,* w't;. gf I
+.,
+ ggg
(
hp j
errace >
nRF$
~
TIU JC$epp":1m 5 ':
g,s -
4kf@l17.
- b.
..,,, w P
db
~ NBC PORM $18 (9 76) NROi 0240 W u. s. eovanysset ressmsee orrecs i.re.sae.eas
g,
)
WASHINGTON PUBLIC POWER SUPPLY SYSTEtt WPP33 ""T.EM PR0'ICT NOS. 3 & 5 m 2 0 97 COCKET :.05. STN 50-508/503 SAFETY EVALUATION SUPPLEMENT NO. 3 We presented cur evaluation and conclusions with respect t o the seis.nic design basis for the proposed Washington Public Power Supply s em Projects No. 3 and No. 5 (WPPSS 3 & 5) in the Safety Evaluation (SER) dated February ll,1976.
eport Our conclusions therein were based on an evaluation of tectonic structure and seismicity of the Pacific Northwest.
The evaluation considered the significance of the largest historic earthquakes in the region, including the carthquake of December 14, 1872, on the determination of the seismic design ba i ss for the site.
The WPPSS 3 & 5 Preliminary Safety Analysis Report (PSAR) stat location of the 1872 earthquake as being at approximately 49'10 e
121'00'W, about 35 miles east of Chilliwack, British Columbia This location was based on the report of Milne (1956) which relied pr y
on the effects produced by the earthquake in Canada.
However, in our
~
SER evaluation we considered the epicenter of this earthquake to b e in the area of Lake Chelan, Washington, approximately 180 miles nort east "of the WPPSS 3 & 5 site and about 75 miles southeast p center stated in the PSAR.
We based this assessment of the earthquakes'
(
location on a more extensive body of intensity information submitte to us during the review of the proposed Skagit Nuclear Project h
- o. I and
^
No. 2 (Docket No. 50-522/523).
i
)
APR 0 0 E77 '
Following the completion of our SER for the WPPSS 3 & S project, we learned that additional information concerning the size and location of the 1872 earthquake might be available, and that an expert review panel had been established by several utility companies of the Pacific Northwest.
The expert review panel was made up of Dr. W.G. Milne, Dr. 0.W. Nuttli, and Dr. D.B. Slemmons, under the Chairmanship of Dr. H. A. Coombs.
The panel was asked to review all available informa-tion concerning the earthquake and prepara a report of findings and conclusions with respect to its maximum intensity and location.
In Supplement 2 to the WPPSS 3 & 5 SER we stated that a study of the earth-quake was being-c'onducted by an expert review panel.
Very little i
additional information about the 1872 earthquake was found.
- However, an exhaustive independent examination of the already available informa-tion was made in consequence of the study. The panel's report was transmitted to us on December 21, 1976.
We transmitted the panel's report to the U.S. Geological Survey for their use in an assessment of the size and location of the 1872 earth-
"' quake based upon the most complete available data set. The Survey jointly with the National Oceanic and Atmospheric Administration has the statutory responsibility for compiling information on earthquake activity in the United States. We, therefore, follow the practice of accepting the evaluations of earthquake locations and magnitudes con-tained in the USGS/NOAA publications " Earthquake History of the United I
i
)
f GP. 2 C E7 States" and the annual " United States Earthquakes" in our evaluation of the seismic design basis of r.uclear plants. The Survey, after review-ing the available information, assigned a maximum intensity of IX MM to the quake and concluded that its location could not be accurately determined. In Appendix A of the Survey's report it was concluded that the earthquake had a magnitude in the range 7.0-7.5 (Richter Scale) based on comparisons of its felt area with the felt areas of recent earthquakes in the Pacific Northwest (USGS/NOAA, 1977).
On February 14, 1977, the applicant submitted amendment 37 to the PSAR in which it summarized the report of the expert panel and other recent reports on the 1872 earthquake prepared for the utilities involved and evaluated the impact of the total body of available information on the seismic design basis proposed for the WPPSS 3 & 5 site. The staff r_
has considered the report by the expert panel, the applicant's amend-ment 37 to the PSAR and the USGS/NOAA evaluation of the earthquake. Our findings with regard to the impact of the 1872 earthquake on the seismic design basis for the WPPSS 3 & 5 units are summarized in the following paragraphs.
With regard to the earthquake's location, all of the recent investigations have concluded that it was centered in the region between Entiat, Washington, and Chilliwack, British Columbia. The applicant in amendment 37 continues to consider a location east of Chilliwack within an area
)
APR 2.0 M77 -
30 miles in radius centered near 49*10'N, 121*00'W to be the most probable for the quake based on ef fects on people and structures. The expert review panel considers the epicentral location to be within a general region that lies between Entiat, Washington and approximately the Canadian border about 75 miles north of Entiat. Thus, the region considered by the panel to be the epicentral region overlaps much of the area considered to be the most likely epicentral region by the applicant. The USGS/NOAA evaluation of the expert panel's report con-cluded that an accurate location of the earthquake has not been deter-mined.
The a'<ailable data do not in our view permit a determination of more than a general epicentral area for the 1872 earthquake. An accurate location is, therefore, ruled out by limitations on the available data. All of the available intensity data, however, support an ept-central location for the event within the region between Entiat, Wash-ington and perhaps somewhat north of the Canadian border, southeast of Chilliwack, British Columbia; a location substantially outside Tthis area is not permitted by the data. This region, embraces the location, Lake Chelan area, accepted by the staff during our WPPSS 3 & 5 project review. Our earlier conclusion that the 1872 earthquake was centered east of the Cascade Mountains about 180 miles northeast of the WPPSS 3 & 5 site is consistent with the additional analyses submitted.
+
-n
)
s in.2 C n?1 Theapplicant(amendment 37)also'performedanassessmentofthe uagnitude of the 1072 earthquake. The assessment was based en a com-parison of the intensity effects of the 1872 earthquake with similar data from more recent earthquakes in the Pacific Northwest for which both instrumental magnitude and intensity information are available.
The comparison supports a Richter magnitude of 7.- 7 1/4 for the earthquake. Based on a similar analysis the USGS/NOAA report in Appendix A concluded that the earthquake had a magnitude in the range 7.0 - 7.5 and could have been larger.if it had a shallow focus. We have reviewed the opplicant's analysis and considered the conclusions contained in the,USGS/NOAA report. They support our earlier estimate of the size of this event stated in the SER.
The seismic design basis for the WPPSS 3 & 5 units is based on an estimated maximum earthquake of magnitude 7.5 centered on a segment of the Olympia fault 22 miles northeast of the site. In accepting the magnitude 7.5 as a reasonable maximum earthquake for this structure, we took account of the seismicity and tectonic characteristics of the region including the largest historic earthquakes. The subsequent analyses of the 1872 earthquake have added to the information available to us during our preparation of the SER only in the measure that some confirmation of our estimate of its magnitude has been provided. We find no reason, therefore, to alter our earlier conclusions about the seismic design basis for the WPPSS 3 & 5 units.
~
)
AFF, O C 977 In conclusion, we have considered the report of the expert review panel, the additional discussion of the 1872 earthquake submitted Ly applicar.t in amendment 37 to the PSAR and the USGS/NOAA analysis. Based on our evaluation and for the reasons stated above we conclude that the evaluations of information on the December 14, 1872 earthquake which have been conducted since the completion of our SER for the WPPSS 3 & 5 project support the mageitude and location of the event which we considered in our review of the seismic design basis for the site.
Our previous conclusions about the seismic design basis for the site which took into consideration the 1872 earthquake, are unchanged by the subsequent investigations.
i.
e O
e 8
s
~
~
l..
)
I
."e f-?rences Milne, W.G. (1956) " Seismic Activity in Canada, West of the 113 Heridian,1841 to 1951," Publication of the Dominion Observatory, Ottawa, Vol. XVIII, No. 7 Ottawa, Canada.
J.
USGS/NOAA, (1977) " Maximum Intensity of the Wash ington Earthquake of f.
December.14,1872," USGS/NOAA ad hoc Working Group on Intensities l'
of Historic Earthquakes.
L e
F L
t i
f h
T l
l l
r
.