ML16341E757
| ML16341E757 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 08/11/1988 |
| From: | Stello V NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Lagomarsino R HOUSE OF REP. |
| Shared Package | |
| ML16341E758 | List: |
| References | |
| NUDOCS 8808220231 | |
| Download: ML16341E757 (14) | |
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UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 August.11, 1988 The Honorable Robert J.
Lagomarsino United States House of Representatives Washington, D.C.
20515 Dear Congressman Lagomarsino:
This letter responds to your letter of July 21; 1988, to Chairman Zech, which enclosed a letter from your constituent, Catherine Ann Wombold of Santa Maria, California.
Ms. Wombold wanted information about Santa Barbara County's earth-quake awareness, and she also wanted to know what effect a large-scale earth-quake would have on the nuclear power plant at Diablo Canyon and whether it would endanger the public safety.
This Agency can provide no information about Santa Barbara County's earthquake awareness.
However, the other issue raised by Ms. Wombold has been studied in detail by the Diablo Canyon owner, Pacific Gas and Electric Company, and by the Nuclear Regulatory Commission (NRC) staff over the past 20 years.
NRC regu-lations (Appendix A to Part 100 of Title 10 of the Code of Federal Re ulations) require that nuclear power plants be able to safely wi s
an e maximum seismic vibratory ground motion that can reasonably be expected to occur in the vicinity of the plant.
Part 100 specifies that this finding shall be based on an evaluation of the maximum earthquake potential considering the regional and local geology and seismology and specific characteristics of local sub-surface material.
The NRC staff's evaluation of this issue is summarized in several supplements to the NRC Safety Evaluation Report on Diablo Canyon.
The specific reports that are most relevant to Ms. Wombold's concerns are SER Supplement 1, dated January 31, 1975; Supplement 4, dated May ll, 1976; Supplement 5, dated September 10, 1976; Supplement 7, dated May 26, 1978; and Supplement 11, dated October 1, 1980.
On the basis of evaluations described in these and other reports and the results of extensive public hearings held to litigate seismic issues, the NRC staff concluded that there is reasonable assurance that the Diablo Canyon Nuclear Power Plant can safely withstand an earthquake that would produce the maximum vibratory ground motion at the plant site.
For Diablo Canyon, this is a magnitude 7.5 earthquake occurring on the Hosgri fault, which is about 2k miles from the plant at its closest approach.
Other earthquakes were evaluated, such as a "great" earthquake (magnitude 8.5) on the San Andreas fault, but this earthquake would result in less severe ground motion at the plant because of its greater distance from the plant (the San Andreas is about 48 miles from the plant at the point of closest approach).
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The Honorable Robert J.
Lagomarsino In summary, the NRC staff has concluded that the Diablo Canyon Nuclear Power Plants could withstand the earthquake producing the maximum vibratory ground motion at the plant sites without damage to the essential safety systems required to protect the health and safety of the public.
On the basis of this conclusion and the finding that the Diablo Canyon plants meet all other applicable safety regulations, the two nuclear plants at Diablo Canyon were licensed by NRC to operate at full power on November 2, 1984 (Unit 1) and on August 26, 1985 (Unit 2).
The Code of Federal Re ulations, Diablo Canyon Final Safety Analysis Report prepare y,aci ic-as an
. ectric Compariy=, the NRC Safety Evaluation Report Supplements referenced
- herein, hearing transcripts, and the other information about earthquakes used by NRC in reaching its finding of seismic adequacy at Diablo Canyon are available for public examination at NRC's Local Public Document Room at the California Polytechnic State University Library, Government Documents and Maps Department, San Luis Obispo, California 93407.
I hope this information is helpful to you in responding to Ms. Wombold.
Please contact me if I can be of further assistance.
Sincerely, Qplginal Sinned BV)
James M. TaYlor Victor Stello, Jr.
Executive Director for Operations DISTRIBUTION NRC PDR (vi/cy of incoming)
Local PDR (w/cy of incoming)
EDO 80003851 EDO Reading TMurley/JSniezek FMiraglia PD5 Reading (w/cy of incoming)
DMCrutchfield TMartin
- See previous concurrence
- DRSP/LA:PD5
- DRSP/PM: PD5
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The Honorable Robert J.
Lagomarsino In summary, the NRC staff has concluded that the Diablo Canyon Nuclear gower Plants could withstand the earthquake producing the maximum vibratory ground motion at the plant sites without damage to the essential safety systems required to protect the health and safety of the public.
On the basis of this conclusion and the finding that the Diablo Canyon plants meet all/other applicable safety regulations, the two nuclear plants at DiabloqCanyon were licensed by NRC to operate at full power on November 2, 1984
,lfnit 1) and on August 26, 1985 (Unit 2).
The Code of Federal Regulations-Diablo Canyon Final-Safety Ana'lysis Report prepared-by~Pacific Gas and Electric--Company=; the NRC Safety Evaluation Report Supplements referenced herein, hearing-transcripts, and the other information about earthquakes used by NRC in reaching its finding of seismic adequacy at Diablo Canyon are available for public examination~at NRC's Local Public Document Room at the California Polytechnic State'Univer sity Library, Government Documents and Reps Department, San Luis Obispo, California 93407.
I hope this information is helpful to you ip responding to Rs.
Wombold.
Please contact me if I can be of further assista ce.
S in cere ly,
- TEDIT 8/01/88 DISTRIBUTION NRC PDR (w/cy of incoming)
Local PDR (w/cy of incoming)
EDO ¹0003851 EDO Reading TMurley/JSniezek FMiraglia PD5 Reading (w/cy of incoming)
DMCrutchfield TMartin
- See previous concurrence
- DRSP/LA:PD5 l*DRSP/PM:PD5 Lee/GK for
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7/29/88 Victor Stello, Jr.
Executive Director for Operations GMHo1ahan OGC-Rockville GPA (3)
VStello DMossburg, PMAS (EDO ¹3851)
PShea HRood (w/cy of incoming)
JLee PD5 ¹3851 Green Ticket File FGillespie
- DRSP/D:PD5 9ADR GMKnighton GMHolahan 7/29/88 8/02/88 R
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The Honorable Robert J.
Lagomarsino In summary, the NRC staff has concluded that the Diablo Canyon Nuclear Power Plants could withstand the earthquake producing the maximum vibrato'ry ground motion at the plant sites without damage to the essential safety>systems required to protect the health and safety of the public.
On the bases of this conclusion and the finding that the Diablo Canyon plants meet,all other applicable safety regulations, the two nuclear plants at Diab'lo Canyon were licensed by NRC to operate at full power on November 2, 1984 (Unit I) and on August 26, 1985 (Unit 2).
The Diablo Canyon Final Safety Analysis Report prepared'by Pacific Gas and Electric Company, the NRC Safety Evaluation Report Supplements referenced
- herein, hearing transcripts, and the other information about earthquakes used by NRC in reaching its finding of seismic adequacy~at Diablo Canyon are available for public examination at NRC's Local public Document Room at the California Polytechnic State University Library~ Government Documents and Maps Department, San Luis Obispo, California 93407'.
I hope this information is helpful to you ~in responding to Ms. Wombold.
Please i
contact me if I can be of further assistance.
~
Si cerely, Victor Stello, Jr.
Executive Director for Operations DISTRIBUTION NRC PDR (w/cy of incoming)
Local PDR (w/cy of incom hg)
EDO 80003851 EDO Reading TMur1 ey/JSni eze k FMiraglia PD5 Reading (w/cy o incoming)
DMCrutchfield
- See previous coq urrence gF-~C
- DRSP/LA:PD5
- RSP/PM:PD5 TEDIT Lee/GK for Rood:dr 7/29/88
/29/88 8/01/88 GMHolahan OGC-Rockville GPA (3)
VStello DMossburg, PMAS (EDO 83851)
PShea HRood (w/cy of incoming)
JLee PD5 83851 Green Ticket File
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The Honorable Robert J.
Lagomarsino In summary, the NRC staff has concluded that the Diablo Canyon Nug ear Power Plants could withstand the earthquake producing the maximum vibrtftory ground motion at the plant site without damage to the essential safet systems required to protect the health and safety of the public.
Bay d on this conclusion and the finding that the Diablo Canyon Plants megt all other applicable safety regulations, the two nuclear plants at Di'ablo Canyon were licensed by the NRC to operate at full power on November
, 1984 (Unit I) and on August 26, 1985 (Unit 2).
The Diablo Canyon Final Safety Analysis Report prepared by Pacific Gas and Electric Company, the NRC Safety Evaluation Supplemy(ts referenced
- above, hearing transcripts, and the other information abop't earthquakes used by the NRC in reaching its finding of seismic adequacy t Diablo Canyon are available for public examination at the NRC's Local Publi Document Room located at the California Polytechnic State University Library, Government Documents and Maps Department, San Luis Obispo, California 9340 I hope this information is helpful to you i responding to Ms. Mombold.
Please contact me if I can be of further assista ce.
Sin
- rely, DISTRIBUTION NRC PDR (w/cy of incoming)
Local PDR (w/cy of incomi'ng)
EDO ¹0003851 EDO Reading TMurley/JSniezek FMirag 1 ia PD5 Reading (w/cy f incoming)
DMCrutchfield Victor Stello, Jr.
Executive Director for Operations GMHolahan OGC-Rockville GPA (3)
VStello DMossburg, PMAS (EDO ¹3851)
PShea HRood (w/cy of incoming)
JLee PD5 ¹3851 Green Ticket File
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0 UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 EDO Principal Correspondence Control FROM:
DUE: 08/09/88 EDO CONTROL: 0003851 DOC DT: 07/21/88 FINAL REPLY:
Rep.
Robert J. Lagomarsino TO:
Chairman Zech FOR SIGNATURE OF:
Executive Director 44 GRN CRC NO: 88-0675 DESC:
ROUTING:
ENCLOSES LETTER FROM CATHERINE A.
WOMBOLD RE IMPACT OF A LARGE SCALE EARTHQUAKE ON DIABLO CANYON NUCLEAR POWER PLANT
- JMartin, RV DATE: 07/26/88 ASSIGNED TO:
. NRR CONTACT:
Mur 1 ey SPECIAL INSTRUCTIONS OR REMARKS:
NRR RECEIVED JULY 26'988 ACTION:
DRSP:CRUTCHFIELD NRR ROUTING:
HURLEY/SNIEZEK MIRAGLIA HARTIN GILLESPIE MOSSBURG
, ~
l't 1
4l OFFICE OF THE SECRETARY CORRESPONDENCE CONTROL TICKET PAPER NUMBER:
ACTION OFFICE:
CRC-88-0675 EDO LOGGING DATE: Jul 25 88 AUTHOR:
AFFILIATION:
LETTER DATE:
SUBJECT:
ACTION:
DISTRIBUTION:
R.J.
Lagomarsino Const Ref U.S.
HOUSE OF REPRESENTATIVES Jul 21 88 FILE CODE:
ID&R-5 Diablo Canyon Impact of large scale earthquake on Diablo Canyon nuclear power plants Direct Reply OCA to Ack SPECIAL HANDLING: None NOTES DATE DUE:
SIGNATURE:
AFFILIATION:
Catherine A Wombold Aug 8 88 DATE SIGNED:
Rec'd gf. happ Date XEO-003851 Time
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