ML20212L136
| ML20212L136 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Diablo Canyon |
| Issue date: | 02/11/1976 |
| From: | Allison D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20150F500 | List:
|
| References | |
| FOIA-86-391 NUDOCS 8608250222 | |
| Download: ML20212L136 (3) | |
Text
l ty
-}
- n.
_l
- A
.y FEB 111976 i
D004T NOS. 50-275 AND 50-323 APPLICANT: PACIFIC CAS AND ELECTRIC COMPANY (PG&E)
Facri. TTY:
DIABLO CANTON NUCLEAR POWER STATION, UNITS 1 AND 2 (DIABIA CANTON)
~
$UWN&Er OF MEETING BELD ON JANUARY 14, 1976 TO DISCUSS DIABIA CANTON
$315MIC DESIQt
& at with the applicant on January 14, 1976 to discuss the Diablo Gaycw seismic design. A list of attendees is provided in the enclosure.
The Wppse of the meeting was to provide the applicant with a report on the status of our geology / seismology review of the,Diablo Canyon opera' tins licemee# application. We had receivuid a* draft irecommeimdatiA from our consultants, the U. S. Geological Survey (USGS), on 12/24/75 and we had discussed this draft with USGS on 12/30/75. We had then raem4ved a second draft reco====d= tion on 01/12/76. On 01/13/76 we had discussed this draft with our seismic design consultants, Dr. N. Newmark and Dr. W. Hall (Newmark and Hall). We intended to hold further discussions with the USGS and Newmark and Hall on this subject before arriving at a staff position on the adequacy of the Diablo Canyon seismic design.
We informed the applicant that the draft USGS reports recommanded assuming that an earthquake of magnitude 7.0 or above could occur on the Hosgri fault.
(The applicant had proposed assuming that a magnitude 6.25 earthquake could occur on this fault). We also inforsed the applicant that the bases for the USGS draft.recommandation were primarily: (1) that the location data on the 1927 earthquake indicate that it might have occurred on the Hongri fault and (2) that the information on the length of the Hosgri fault warranted assuming such an earthquake.
The applicant questioned whether locating the 1927 earthquake on the Hosgri fault could be consistent with the felt effects from that earthquake. He also stated that his consultants did not interpret the data on fault length in the same way as the USGS had interpreted them.
Wo informed the applicant that the draft USGS reports also stated the opinion that the unus1 approach of scaling a standard response spectrum 8608250222 860301 PDR FOIA
/
HOUCH86-391 PDR
=
ttf EN A M s %
A-W=~+
. n- % -.
Fons AEC 318 (Ite 9 5J-) AECM 0240
- u. s. novannusur raiwrino orrecas sere.sae.ees
^
}_.
~. a 6
..Q.?
^ -
FEB 11876 1-to a single acceleration value may not be an appropriate representation for design purposes. They, therefore, recosmoonded using the approach described in USGS Circular 672, " Ground Motion Values for Use in the Seismic Design of the Trans-Alaska Pipeline System." We were azploring the use of this approach with Mewaark and Ball.
The applicant expressed the feeling that a meeting betusen his consultants (Dr. D. Hamilton and Dr. S. Smith), the staff and USGS may help to resolve the differences between the applicants' intarpretations of the data and i
those of the USGS. The applicant requested that such a meeting be held j
before the staff takes a final position. We told the applicant that we i
vould aska every effort to resolve any differences of opiaian and to azamine the design adequacy before taking a position. Un stated that we would consider the request for a meeting with USGS and the staff. We also stated that.we hoped to adopt a position within about one month.
The applicant stated that the USGS research vessel " San Lee" had been working in the vicinity of Diablo Canyon and expressed concern about whether the USGS may have any pertinent data which..the applicant does not' hwe. We ' stated that;' based on our ' conversations with USGS,*se issre ~
~
convinced that USGS was not utilizing, in its review of Diablo Canyon.
any partinant data which the applicant did not have. Neverchalass, we agreed to check this again with USGS.
i Originci T.W 3Y Donnis P. A!ilun D. P. Allison Light Water Reactors Branch No. 3 Division of Project Management
Enclosure:
Attendance list ec: Service lh t i
1 l
i
)
)
l
.y
-DPM: LWR-#3---
- u""*"**
DA111 son:st-
- * "
- d[-[7S Forms AEC-3ta (Rev 9 53) ARQt 0240 W u. e. oovannment raiwrine orrecas se,4.sa see
+
_.s.
- j..... -
~'
~
ne11 m ENCLOSURE ATTENDANCE LIST DIABID CANYON NUCLEAR POWER STATION JANUARY 14, 1976 Pacific Gas & Electric NRC - STAFF W. Lindblad W. Gammill F. Mout:
H. Denton R. Bettinger J. C. Stepp.
G. Blanc K. Kapur I. Sihveil P. Y. Chen D. Crutchfield R. C. DeYoung D. Allison W
FbIAj%-39/
A -4s 4