L-83-319, Forwards Schedule for Completion of Responses to IE Bulletin 80-11, Masonry Wall Design. Required Mods to Masonry Walls Will Be Completed Prior to Completion of First Refueling Outage.Item Closed

Forwards Schedule for Completion of Responses to IE Bulletin 80-11, Masonry Wall Design. Required Mods to Masonry Walls Will Be Completed Prior to Completion of First Refueling Outage.Item Closed

ML20076G358
Person / Time
Site:	Saint Lucie
Issue date:	05/24/1983
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-SSINS-6820 IEB-80-11, L-83-319, NUDOCS 8306140638
Download: ML20076G358 (3)

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• '. P. O. BOX 14000. JUNO DE ACH, F L 33408 A / / ?d;A FLORID A POWER & LIGHT COMPANY May 24, 1983 83 "'1 3 P9: 26 L-83-319 Mr. James P. O'Reilly Regional Administrator, Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, Suite 2900 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

Re: St. Lucie Unit No. 2 Docket 50-389 IE Bulletin 80-11 Masonry Wall Desicn As requested by your Mr. J. J. Lenahan, please find enclosed a schedule for the completion of IE Bulletin 80-11 " Masonry Wall Designs." In addition, please find a set of engineering check prints which should help clarify the enclosed schedule. Florida Power & Light Company believes that the attached information completes the license condition I.F. listed in Attachment 1 under " Items to be Completed Prior to exceeding 5% Rated Power."

Should you have any questions concerning this letter, please do not hesitate to contact us.

Very truly yours, s '$ , my 4y Robert E. Uhrig Vice President Advanced Systems & Technology REU/PPC/ cab Attachment PDR G ADOCK8306140638 05000389 830524 PDR Ih IkIk PEOPLE. . SERVING PEOPLE

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Florida Power & Light Company has committed to provide NRC Region II with a closeout schedule for IE Bulletin 80-11 " Masonry Wall Design."

Below is a status of engineering / construction schedules for the subject j bulletin.

j 1 An initial engineering walkdown of masonry block walls was conducted during the m,onths of December 1981 to March 1982 to determine classification of walls into categories of seismic and nonseismic. Each seismic wall was analyzed to determine corrective action required. Out of the 222 seismic and nonseismic block walls identified at the time (see attached drawing showing block wall locations), 38 were nct then physically constructed.

Please refer to letter L-82-459, dated October 27, 1982, which summarizes the results of the initial walkdown.

2 Subsequent to this inital engineering walkdown, another walk-down was conducted during the months of December 1982/ January 1983. During this walkdown, an additional 16 masonry walls were i identified. As a result of this walkdown, 9 walls were determined to require modifications.

a) RAB walls 1 and 24, due to a reclassification of category 1

^ (nonseismic to seismic), required through bolting in order to, satisfy the acceptance criteria presented in letter L-82-459.

A repair procedure was issued on May 4, 1983 to implement these modifications. Construction is complete for this modi-j fication.

b) RAB wall 145 was reanalyzed following the January 1983 walkdown as a result of additional attachment loads. Analysis determined the requirements for exterior clip angles to provide additional support for the lintels. A repair procedure was issued on

,May 12, 1983. Construction estimates completion of the required modification by June 15, 1983.

c) RAB walls 57 and 58 were only partially constructed at the

' time of the initial walkdown, hence they were not analyzed at that time. These two single wythe walls we,re found to have insufficient rebar and require external reinforcing in order to satisfy the acceptance criteria presented in letter L-82-459.

A repair procedure is being prepared to implement the final

' modifications and Construction estimates completion by June 15, 1983.

l I d) RAB walls 158 and 159 and FHB walls 162 and 163 were found to require a top lateral support. A repair procedure is being prepared to implement the required modifications and Construction estimates completion by June 15, 1983.

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3 20 block walls were completed subsequent to the January 1983 engineering walkdown of masonry block walls. Of these 20 walls, 13 are categorized as seismic, a) RAB walls 231 and 232 require external reinforcing in order to satisfy the acceptance criteria presented in letter L-82-459.

A repair procedure was issued on May 6, 1983. Construction has completed the required modifications.

b) Engineering has mapped out the remaining 11 block walls and is presently analyzing the walls. Engineering analysis will be completed by June 15, 1983.

4 As of May 18, 1983 approximately 57 Field Change Requests (FCR's) had been issued by Construction subsequent to the January 1983 I walkdown. Engineering is in the process of reviewing these FCR's to determine if they have any impact on present concrete block wall design / analysis. This review, to be completed by May 31, 1983, will consist of a review of FCR's impacting presently classified seismic block walls and review of FCR's involving nonseismic block walls to determine if reclassification is required. Any plant design changes issued after May 9, 1983 will continue to be re-viewed for impact on masonry block walls as part of the normal design review process. Field verification will be included as part of this review as required. 21 out of these 57 FCR's have already been reviewed, and it has been determined that they have no significant impact on masonry wall analysis.

FP&L's justification for interim operation past 5% power to first refueling

'is based on the following:

The site is within a region of infrequent and minor seismic activity and has been designated, by the Uniform Building Code, as a Zone 0, which is con-

sidered to be a zone of no earthquake damage. Therefore, the occurrence of an earthquake which could damage the masonry block walls is extremely unlikely.

Although the seismic analysis for the 11 block walls. identified in 3(b) above is not complete, they are reinforced in accordance with details for seismic block walls which reduces the likelihood that additional reinforcement

[ will be required.

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! Florida Power & Light will make all required modifications to the masonry I

walls'at the earliest possible construction window but no later than startup i

! following the first refueling outage.

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