ML19257B890

Responds to IE Bulletin 79-02,Revision 2.Will Conduct Field Survey to Identify field-related Piping Supported from Concrete Block Walls Using Concrete Expansion Anchor Bolts

ML19257B890
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/12/1979
From:	Trimble D ARKANSAS POWER & LIGHT CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
IEB-79-02, IEB-79-2, NUDOCS 8001210169
Download: ML19257B890 (3)

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/ - -NSIC L/PC IR STATE ARKANSAS POWER & LIGHT COMPANY FCST CFlCE ECx 551 UTTLE FCCX. AFKANSAS 72203 $C11371-.1000 December 12, 1979 1-129-6 2-129-6 Mr. K. V. Seyfrit, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011

Subject:

Arkansas Nuclear One - Units 1 & 2 Occket Nos. 50-313 & 50-368 License Nos. DPR-51 3 NPF-6 IE Bulletin 79-02 (File: 1510.1, 2-1510.1)

Gentlemen:

The following is provided in response to IE Bulletin 79-02, Revision 2. Apoli-cable portions of Items 5, 5 and 7 are addressed. All other items have been addressed previously.

Item 5(a)

Determine the extent that expansion anchor bolts were used in concrete block (masonry) walls to attach piping supports in Seismic Category 1 systems (or safety-related systems as defined by Revision 1 of IE Sulletin No. 79-02).

If expansion anchor colts were used in concrete block walls:

Provide a list of the systems involved, with the number of supports, type of anchor bolt, line size, and wnether these supports are accessible during normal plant coeration.

Resconse .

We have determined that certain field-related piping could have been supported from concrete block walls using concrete expansion anchors. Therefore, we have also concluded that only a field survey can adequately identify all the affected systems. We will conduct a field survey and provide results and a list of affected systems on February 10, 1980. 1774 055 Item 5(b)

Describe in detail any design consideration used to account for this type of installation.

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1-129-6 2-129-6 Mr. K. V. Seyfrit December 12, 1979

Response

In mid-1977, load tests were performed at Arkansas Nuclear One to establish load capacities of Phillips redhead anchors when installed in concrete block walls.

A specification was prodt;ced and has been utilized for all concrete block wall installations of Phillips redheads. Additionally, 'hillips redheads were desig-nated as the standard expansion anchor at Arkansas Fuclear One for all installa-tions.

Prior to the tests and specifications, several different types of expansion bolts were used. Load capacities and installation procedures were taken from manufac-turer's published data for poured concrete installation with appropriate reduc-tions for block wall applications.

Item 5(c)

Provide a detailed evaluation of the capability of the supports, including the anchor bolts, and block wall to meet the design loads. The evaluation must describe how the allowable loads on anchor bolts in concrete block walls were determined and also what analytical method was used to determine the integrity of the block walls under the imposed loads. Also describe the acceptance cri-teria, including the numerical values, uced to perform this evaluation.

Response

Due to the time required to compile the list of supports involved and because of limited manpower available to work on this project in conjunction with pre-viously scheduled work (i.e., IE Bulletin 79-14 & 79-02), we believe the earli-est we can complete and submit the analysis results is March 24, 1980.

Item 5(d)

Describe the results of testing of anchor bolts in concrete block walls and your plans and schedule for any further action.

Resoonse As described in the response to Item 5(b), the result of testing at Arkansas Nuclear One is an installation specification for Phillips redhead anchors in conjunction with concrete block walls.

We will verify the adequacy of the installations prior to mid-1977 with a random sampling program similar to that described in earlier 79-02 responses. The re-sults of this program will be provided on March 24, 1980.

Item 6 Determine the extent that pipe supports with expansion anchor bolts used struc-tural steel shapes instead of base plates.

1-129-6 2-129-6 Mr. K. V. Seyfrit December 12, 1979

Response

Pipe supports with expansion anchor bolts, which use structural steel shapes in lieu of baseplates, were included in the original analysis done under Bulletin 79-02, Rev. O and Rev.1. Supports found to have less than the re-quired safety factors are being modified at this time.

Item 7 Provide a schedule that details the completion dates for IE Bulletin 79-02, Rev. 2, Items 1, 2 and 4.

Response

The testing of accessible and inaccessible anchor bolts has been completed for Unit 1. For Unit 2, the testing and documentation done at the time of installa-tion is considered adequate.

Pipe supports with safety factors of less than 4 (or 5 depending on the type of anchor bolt used) but greater than 2 identified under Bulletin 79-02 will be upgraded to meet Bulletin requirements by the next refueling outage as described in our July 6,1979 letters numbered 1-079-1 and 2-179-1.

Very truly yours, b Avih f. V David C. Trimble Manager, Licensing DCT:MDW:skm cc: Mr. Norman C. Moseley Director, Division of Reactor Operations Inspcction Nuclear Regulatory Conmission 4350 East West Highway Washington, D. C. 20555 Mr. W. D. Johnson U. S. Nuclear Regulatory Commission P. 0. Box 2090 Russellville, AR 72801 1774 057