ML20137D616

Requests Response to Listed Questions Re micro-earthquake Activity & Seismic Design Deficiencies at Facility.Requests Ltr Be Made Formal Part of Record of ACRS Hearing Scheduled for 780106

ML20137D616
Person / Time
Site:	North Anna, 05000000
Issue date:	01/04/1978
From:	Allen J NORTH ANNA ENVIRONMENTAL COALITION
To:	Bender M Advisory Committee on Reactor Safeguards
Shared Package
ML20136A555	List: IA-85-363, Submits Topics for Discussion at Commission 830708 Meeting W/Acrs.Topics Include Seismic Design Margins ML20136A550 ML20136E176 ML20136E418 ML20136E423 ML20136E621 ML20136E929 ML20136F618 ML20137D336 ML20137D440 ML20137D455 ML20137D472 ML20137D477 ML20137D494 ML20137D511 ML20137D540 ML20137D551 ML20137D557 ML20137D562 ML20137D570 ML20137D576 ML20137D583 ML20137D588 ML20137D598 ML20137D601 ML20137D609 ML20137D616 ML20137D621 ML20137D627 ML20137D635 ML20137D641 ML20137D646 ML20137D652 ML20137D659 ML20137D665 ML20137D670 ML20137D849 ML20137D867 ML20137D881 ML20137D911 ML20137D924 ML20137D951 ML20137D978 ML20137E016 ML20137E026 ML20137E044 ML20137E056 ML20137E075 ML20137E098 ML20137E113 ... further results
References
FOIA-85-363 NUDOCS 8508220523
Download: ML20137D616 (2)

Text

4QRTH January

' ANNA D4VIRONMENTA_

4,1978 COALITION P.o. Box 3951 CHARLOTTESVILLE, VIICINIA 22903 Mr. Myer Bender, Chairman (717)533-7694 or (804)293-6039 Advisory Committee on Reactor Safeguards U.S. Nuclear Regulatory Commission washington, D. C. 20555

Dear Mr. Bender:

The Coalition was pleased to learn that the Advisory Committee on Heactor safeguards plans to consider seismic design margins for the horth Anna reactors at its af ternoon session on Friday, January 6.

we respectfully request that the Committee provide answers to the following questions:

1. Can an " unexplained" cluster of 46 micro-earthquakes northwest of the North Anna dam be accurately said not to present some measure of seismic risk to the site?

(Please note attached map and correlation of the cluster with a postulated major regional fault--Spotsylvania or Neuschel's Lineauent.)

2. How do USGS seismologists interpret the sig-nificance of the micro-earthquake cluster?

3 Why is the ACRS willing to approve a 40%

design deficiency at North Anna? If the ACRS

• • stipulates that any new reactors enstructed in the Last must have a minimum safe shutdown earthquake design of .20g, what is the ration-ale for approving North Anna's design of .12g7

4. What are the results of the SEISMIC RE-EVALUA-TION OF NORTil ANhA requested on April 22, 1977 by ARC's J. P. Knight , assistant Director for Engineering, DSS 7 5 Have those results been made known to the Atomic Safety and Licensing Board considering an operating license for horth Anna t At this writing, we are also submitting questions to Mr. Leon Reiter, hRC Staff seismologist with a request for answers at his earliest convenience. He enclose a copy for your use, and shall ask Mr. Reiter to supply the ACRS with the same answers mailed to NAEC.

If the Coalition is unable to have a representative attend the January 6 meeting on North Anna, plenne make this letter and the attachments thereto a f o rma l pa rt if the record. 1 hank you for your professional attention.

ncerely, Ah cc: Rep. John Moss Jpje' Allen (Mrs. P. M.) '

Sen. Gary llart Enclosures 8500220523 850722 PDR FOIA DELL 85-363 PDR r

"NDRTH ANNA fhlVIRONMENT4 COALITION January 4,1978 P.O. BOX 3951 Cl!ARLOTTESVILLE, VIRGINIA 22902 Mr. Myer llender, Chairman (7171533-7694 or (804)293-6039 Advisory Committee on Itcactor Safeguards U.S. huclear Hegulatory Commission ,

washington. D. C. 20555 l

Dear Mr. ilender:

The Coalition was pleased to learn that the Advisory Committee on Reactor safeguards plans to consider seismic '

design margins for the North Anna reactors at its al ternoon session,on Friday, January 6.

ne respectfully request that the Committee provide answers to the following questions:

1. Can an " unexplained" cluster of 46 micro-carthquakes northwest of the North Anna dam be accurately said not to present some measure of seismic risk to the site?

(Please note attached map and correlation of

_ , , , ,, the cluster with a postulated major regional fault--Spotsylvania or Neuschel's Lincament.)

p '. ". , . g'.*Q,

'"- " 2. Ilow do USGS seismologists interpret the sig-

. . . nificance of the micro-carthquake cluster?

jf.y L n /d'

. 3 Hhy is the ACHS willing to approve a 40%

f ,, fi design deficiency at North Anna? If the ACHS j 1, ' , ,.-, . . ,b, . , ( 8,; ' c"8' stipulates that any new reactors enstructed

! in the East must have a minimum safe shutdown earthquake desigr. of .20g, what is the ration-ale for approving North Anna's design of .12g7

4. What are the results of the SEISMIC RE-EVALUA-TION OF NORTil ANNA requested on April 22, 1977 by NRC's J. P. Knight, ,sssistant Director fo.-

Engineering, DSS?

5 llave those results been made known to the Atomic Safety and Licensing floard considering an operating license for horth Anna t At this writing, we are also submitting questions to Mr. leon Reiter, hRC Staff seismologist with a request j for answers at his earliest convenience. %e enclose a copy for your use, and shall ask Mr. lleiter to supply the ACRS with the same answers mailed to NAEC.

If the Coalition is unable to have a representative attend the January 6 meeting on North Anna, please make this letter and the at tachments thereto a formal pa rt of the record. 'ihank you f or your prof essional attention.

cc: Hep. John Moss J e Allen (Hrs. P. M.)

Sen. Gary liart 'sident, SAEC Enclosures

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