ML20210R953

SER Supporting Util Response to IE Bulletin 80-11 Re Masonry Wall design.Safety-related Masonry Walls Will Withstand Specified Design Load Conditions W/O Impairment of Wall Integrity.Technical Evaluation Rept Encl

ML20210R953
Person / Time
Site:	Crystal River
Issue date:	05/02/1986
From:	NRC
To:
Shared Package
ML20210C305	List: ML20210C299 ML20210R947 ML20210R953
References
IEB-80-11, NUDOCS 8605200147
Download: ML20210R953 (2)

Text

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ENCLOSURE SAFETY EVALUATION REPORT _

MASONRY WALL DESIGN, IE BULLETIN 80-11 CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 ,

The findings reported in this Safety Evaluation Report (SER) are based on the attached Technical Evaluation Report (TER), Attachment 1, prepared by Franklin Research Center (FRC) as a contractor to NRC. This TER contains the details of construction techniques used, technical information reviewed, acceptance criteria, and technical findings with respect to masonry wall construction at h the Crystal River Plant. The staff has reviewed this TER and concurs with its technical findings. The following is our summary of the major technical findings:

( 1. Initially, the licensee identified five masonry walls in the control t complex building as safety-related. Three walls in the instrument room of the turbine building, a non-safety-related structure, were also evaluated as a result of the upgrade to the emergency feedwater system. Based on a later inspection, the licensee concluded that the collapse of two walls (No. 2 and No. 3) in the control complex building will have no adverse effect on the safety-related equipment in the area. As discussed in item 2 below, Wall No. I was modified so that it will not interact with the safety-related equipment. For the remaining walls, the results from the licensee's working stress analysis indicate that the gf $$ 2 a

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calculated stresses in these walls comply with the intent of the staff acceptance criteria (Appendix A of the TER).

2. The only safety-related equipment associated with Wall 1 of the control complex is the ventilation system main supply air duct. The collapse of Wall I could possibly damage the vertical section of this duct. However, the licensee has modified this wall by removing a portion of the wall that

. could impact the duct. Thus, the potential interaction between the duct and the wall has been eliminated. Additionally, the license performed slight modifications to Walls 2 and 3 to ensure that the safe'ty-related h electrical conduits which penetrate these walls at the top boundary are not in contact with these walls. As discussed in item 1, these walls are no longer considered safety-related walls. The licensee has also changed engineering procedures to assure that the safety-related equipment will f not be placed in the vicinity of these walls in the future.

Based on the above findings, the staff concludes that Items 2(b) and 3 of the IE Bulletin 80-11 have been fully implemented at Crystal River 3 and that there is a reasonable assurance that the safety-related masonry walls at Crystal River 3 will withstand the specified design load conditions without impairment of (a) wall integrity or (b) the performance of the required safety functions.

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