ML19294B882
| ML19294B882 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 01/03/1980 |
| From: | Broehl D PORTLAND GENERAL ELECTRIC CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-79-02, IEB-79-2, NUDOCS 8003060252 | |
| Download: ML19294B882 (3) | |
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Janua ry 3, 19M-Mr. R. II. Engelken, Director U. S. Nuclear Regulatory Commission Region V Suite 202, Walnut Creek Plaza 1990 N. California Blvd.
Walnut Creek, CA 94596
Dear Sir:
It has recently come to our attention that the expansion anchor bolt allow-able loads in masonry that were used in the initial reevaluation analyses performed by Bechtel differed from those reported in our response dated November 21, 1979 to IE Bulletin 79-02, Revision 1.
The values reported in our response were used in early calculations, but were subsequently changed to values consistent with the original criteria.
Since detailed reviews were performed after the initial reevaluations using the allowable values listed in Table 1-2 of our response, the data and conclusions reported remain unchanged.
However, for clarification, we are attaching revised pages with the appropriate changes marked by a 2 in the right-hand column.
Please substitute these pages in your copy of our response.
Sincerely,
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Mr. Lynn Frank, Director State of Oregon Department of Energy Director Office of Inspection and Enforcement Division of Nuclear Operations Inspections Mr. A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors U. S. Nuclear Regulatory Commission 8003060 2 5 2' w :: mo c.e una cm,m f'),
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Trojan Nuclear Plant Pipe Support Base Plates Using Concrete Expansion Anchor Bolts Page 5 Table 1-1 summarizes results of the reevaluation analyses, as de-scribed above, of pipe support base plates for all safety-related piping systems (3" and larger).
In Table 1-1, the numbers of pipe supports with expansion anchor bolts in the various ranges of shear-tension interaction ratios are shown.
Initial evaluations of expansion bolt loads, pursuant to the Bulletin, were made using allowable load values listed in Table 1-2.
These loads are based on tile following:
b 1.
Concrete:
The allowable values ~ are the manufacturer's ultimate values given in Phillps Red Head Catalogue F-1000 divided by a factor of safety of 5.
2.
Masonry:
The allowable values are based on the values given in Phillips Catalogue F-1000 divided by a factor of safety of 10.
A These lower bound values were used irrespective of considera-tions of test data applicability (ie, nasonry strength, repre-sentative bolt sizes, etc) for the purpose of eliminating from further analysis those supports which are only lightly loaded.
Allowable anchor bolt loads which are considered to be appropriate
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for Trojan are discussed in the following section.
Detailed Review of Anchor Bolts With Interaction Ratios Greater Than One The results of the base plant reevaluation analysis for interaction ratios greater than one were reviewed pursuant to IE Bulletin 79-02, Revision 1, Supplement 1.
The results of this detailed review are shown in Table 1-3.
Allowable bolt loads for this review were based on the following:
1.
Concrete:
The allowable values are the manufacturer's ultimate values given in Phillips Red Head Catalogue F-1000 divided by a factor of safety of 5.
2.
Masonry:
Values for heavy masonry (II are based on a material correction factor of 0.6 applied to the concrete values and a further reduction factor of 0.71 for standard weight masonry The 0.6 factor is based on International Conference of Building Of ficials (ICB0) Standard No.1372 (February 1975) which lists (1) Heavy masonry is high density concrete block with fh 14000 psi.
Standard masonry is regular weight concrete block with fh 12000 psi.
Page 8 TABLE 1-2 ALLOWABLE PHILLIPS RED HEAD SELF-DRILLIf1G Af C!l0R BuLT LOADS (ALL LOADS ARE Ill KIPS)
I.
Concrete Size Tension Shear 3/8 1.13 0.67 1/2 1 70 1.34 5/8 2.34 2.38 3/4 3.24 3.24 7/8 3.57 3.69 II. flasonry - Used in initial Bechtel Reevaluation Analyses b
Size Tension Shear 3/8 0.567 0.337 1/2 0.850 0.672 5/8 1.17 1.19
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3/4 1.62 1.62 7/8 1.785 1.845 III. Masonry - Used in Detailed Review Analyses
/h Size Heavy Masonry (1)
Standard Masonry (2)
Tension Shear Tension Shear 3/8 0.68 0.40 0.48 0.29 1/2 1.02 0.80 0.72 0.57 5/8 1.40 1.43 1.00 1.01 3/4 1.94 1.94 1.38 1.38 7/8 2.14
- 2. P.1 1.52 1.57 (1) Heavy Masonry fE 14000 psi.
(2) Standard Masonry f$ 12000 psi.