ML20204D998
| ML20204D998 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 07/16/1986 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Campbell G ARKANSAS POWER & LIGHT CO. |
| References | |
| REF-GTECI-A-46, REF-GTECI-SC, RTR-NUREG-CR-1577, TASK-A-46, TASK-OR NUDOCS 8607310533 | |
| Download: ML20204D998 (5) | |
Text
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9 July 16,1986 o
AISTRIBtITION Docket No. 50-313 (Docker File 3 GVissing NRC PDR JRamsey L PDR Gray File Mr. Gene Campbell PBD#6 Rdg Vice President, Nuclear FMiraglia Operation 0GC Arkansas Power and Light, Company ACRS-10 P. O. Box 551 EJordan T
Little Rock, Arkansas 72203 BGrimes JPar'tlow
Dear Mr. Campbell:
KThompson RIngram We have reviewed your letter dated April 11, 1986, concerning the seismic design of Arkansas Nuclear One, Unit 1 (AN0-1).
It appears that your procedures do not routinely consider the interaction of non-seismically designed (Catagory II) structures, systems or equipment which are directly connected to or over and in the proximity to Seismic Catagory I structures, systems or equipment (Catagory II/Catagory I). You have indicated that you do not judge current Catagory II/Catagory I considerations to be part of the licensing basis for ANO-1 because the current Catagory II/Catagory I requirements are different from those that were in effect during the period in which ANO-1 was designed, built and licensed.
The interaction of Seismic Catagory I and Non-seismic Catagory II structures, systems and components are currently addressed at AN0-1 as follows:
Non-seismically Catagory II equipment and piping systems whose failure or excessive movement could cause a failure of Seismic Catagory I structures are restrained so as not to cause a failure of only these structures, Where Seismic Catagory I piping is directly connected to Non-seismic Catagory II piping, the entire system is analyzed to the first seismic anchor as an integral Seismic Catagory I piping system.
All other Non-seismic Catagory II structures, systems and components are only designed to the Uniform Building Code.
AN0-1 is in northwestern Arkansas, an area of relatively low seismicity.
NUREG/CR-1577 (An Approach To Seismic Zonation For Siting Nuclear Electric Power Generating Facilities In The Eastern United States) indicates that the siteregionhasexperiencedlessthan4earthquakesofModifiedMergalli l
intensity III or greater or of magnitude 2 or greater per 11,680 km during l
the period 1800-1977. The nearest source of major seismicity is the New l
Madrid seismogenic zone which is approximately 250 kilometers at its closest approach to this site.
l Based on these considerations ANO-1 is in an area which does not appear to have high seismic hazard and, therefore, there is not an immediate earthquake i
l threat which is considered to be of sufficient safety significance to require l
8607310533 860716 PDR ADOCK OD000313 P
4 a
. a formal analysis of ANO-1 to current licensing standards. However, there is still a staff concern about this issue in that the potential for damage to seismic Category 1 equipment during an earthquake may exist.
A resolution to this issue would be the implementation of the proposed criteria resulting from the technical resolution of USI A-46, " Seismic Qualification of Equipment in Operating Plants." This program has been under development with industry participation and is nearing final resolution.
It is our understanding that AN0-1 is are of the plants that would be subject to the criteria defined in resolution of A-46.
This program currently includes performance of a seismic systems interaction review. The systems interaction review is limited to the review of Non-seismic Category II structures, piping and equipment affecting equipment needed to take the plant to a hot shutdown condition.
It is 4
anticipated that the final resolution of USI A-46 will be issued by September, 1986. We will keep this issue open pending resolution of USI A-46.
Upon resolution of A-46 we will inform you of the criteria which have been determined to be applicable to ANO-1.
1"81gggjsIcmD r
J0Q y, sngey John F. Stolz, Director PWR Project Directorate #6 Division of PWR Licensing - B cc: See next page
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.. a formal analysis of ANO-1 to current licensing standards. However, there is still a staff concern about this issue in that the potential for damage to seismic Class 1 equipment during an earthquake may exist.
A resolution to this issue would be the implementation of the proposed criteria resulting from the technical resolution of USI A-46, " Seismic Qualification of Equipment in Operating Plants." This program has been under development with industry participation and is nearing final resolution.
It is our understanding that ANO-1 is one of the plants that would be subject to the criteria defined in resolution of A-46. This program currently includes performance of a seismic systems interaction review. The systems interaction review is' limited to the review of non-seismic Class I structures, piping and equipment affecting equipment needed to take tFe plant to a hot shutdown condition.
It is anticipated that the final resolution of USI A-46 will be issued by September, 1986. We will keep this itsue open pending resolution of USI A-46.
Upon resolution of A-46 we will inform you of the criteria which have been determined to be applicable to ANO-1.
Sincerely, John F. Stolz, Director PWR Project Directorate #6 Division of PWR Licensing - B cc: See next page
- SEE PREVIOUS FOR CONCURREllCE PBD-6 PBD-6*
PBD-6 D:D 0 GVissing;jak CMcCracken JStolz TSpeis 7/ /86 7/01/86 7/02/86 7/g/86
. j a formal analysis of ANO-1 to current licensing standards. However, there is still a staff concern about this issue in that the potential for ' damage to seismic Class 1 equipment during an earthquake may exist.
A resolution to this issue wculd be the implementation of the proposed criteria resulting from the technical resolution of USI A-46, " Seismic Qualification of Equipment in Operating Plants." This program has been under development with industry participation and is nearing final resolution.
It is our understanding that ANO-1 is one of the plants that would be subject to the criteria defined in resolution of A-46.
This program currently includes performance of a seismic systems interaction review. The systems interaction review is limited to the review of non-seismic Class 1 structures, piping and equipment affecting equipment needed to take the plant to a hot shutdown condition.
It is anticipated that the final resolution of USI A-46 will be issued by September, 1986. We will keep this issue open pending resolution of USI A-46.
Upon resolution of A-46 we will inform you of the criteria which have been determined to be applicable to ANO-1.
l Sincerely, John F. Stolz, Directnr PWP Project Directorate #6 4
Division of PWR Licensing - B cc: See next page i
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Mr. G. Campbell Arkansas Power & Light Company Arkansas Nuclear One, Unit I cc:
Mr. J. Ted Enos Manager, Licensing Arkansas Power & Light Company P. O. Box 551 Little Rock, Arkansas 72203 Mr. James M. Levine General Manager Arkansas Nuclear One P. O. Box 608 Russellville, Arkansas 72801 Mr. Nicholas S. Reynolds Bishop, Liberman, Cook, Purcell & Reynolds 1200 Seventeenth Street, N.W.
Washington, D.C.
20036 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 220, 7910 Woodmont Avenue Bethesda, Maryland 20814 Resident Inspector U.S. Nuclear Regulatory Commission P. O. Box 2090 Russellville, Arkansas 72801 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Office of Executive Director for Operations 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Mr. Frank Wilson, Director Division of Environmental Health Protection Department of Health Arkansas Department of Health 4815 West Markham Street Little Rock, Arkansas 72201 Honorable William Abernathy County Judge of Pope County Pope County Courthouse i
Russellville, Arkansas 72801
(