ML18033A280

Operability Criteria for Miscellaneous Steel.

ML18033A280
Person / Time
Site:	Browns Ferry
Issue date:	05/24/1988
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML18033A279	List: ML18033A278 ML18033A280
References
BFEP-TI-C3, NUDOCS 8807180244
Download: ML18033A280 (6)

Text

S20'88 052 4 033 TENNESSEE YALLEY AUTHORlTY Tennessee Valky Division of Nuciear Engineering Authority UNCONTROLLED LEAD CIVIL ENGINEER INSTRUCTION BFEP-TI-C3 TITLE:'PERABILITY CRITERIA'OR'MISCELLANEOUS'TEEL REVISION RO R2 R3 R4 R5 ISSUE DATE F/M/as PREPARED CHECKED RE VIE Vf ED APPROVED 8807l80244 880526 PDR ADOCK 05000260 P PDC )

REVISION LOG

Title:

OPERABILITY CRITERIA FOR MISCELLANEOUS STEEL CEB-C1.102 Revision Date No. DESCRIPTION OF REVISION Approved

1) Issue of this instruction superceedes CEB-C1.102 (B41 880401 002)

2) Added allowable shear stress limit for bolting materal based on discussion with the NRC in a meeting on May 18, 1988 in Rockville, Maryland TVA 10534 {KN DES 4 78)

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OPERABILITY CRITERIA FO ISCELLANEOUS STEEL TABLE OF CONTENTS PAGE 1.0 PURPOSE 1 2.0 SCOPE 3.0 MISCELLANEOUS STEEL EVALUATION CRITERIA 4.0 DOCUMENTATION 5.0 REFFRENCES 0366C-3

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pl OPERABILITY CRITERIA FO MISCELLANEOUS STEEL 1.0 PURPOSE The purpose of this instruction is to provide engineering requirements for implementing Browns Ferry operability criteria as applicable to miscellaneous steel used to support piping and HVAC.

2.0 SCOPE These criteria shall apply to those miscellaneous steel structural members that do not qualify according to Design Criteria BFN-50-C-7100, Attachment G (Reference 5.1). Modifications will be prioritized into two groups: those that require implem~ntation for operability prior to restart, and those that require implementation post-restart. Operability modifications are those modifications that do not comply with the criteria in this document and th<< must be made before resart. Design criteria modifications aro those modifications that comply with the requirements of this document but do not meet design criteria.

3.0 MISCELLANEOUS STEEL EVALUATION CRITERIA 3.1 LOAD COMBINATIONS For operability evaluation, t'e miscellanious steel modifications that do not meet design criteria shall be evaluated only for Loading Condition 8, shown bolow, in accordance with BFN-50-C-7100, Attachment G.

Abnormal Accident + DBE (Seismic) =

DL + LL +Ta + Ra + 1 ~ 0 (Yj +Yr + 'Ym) + E 3.2 ALLOWABLE LIMITS The following limits shall be used to establish priorities for modifications to miscellaneous steel.

3.2.1 Structural stool Members Stresses in structural steel members shall not exceed the lesser of 1.2 Fy and 0.7Fu for tensile and flexural stresses and 90 percent, of the critical buckling stress in compression flange as defined in AISC specification (Reference 5.2) for compressive loads. Shear stresses shall not exceed 60 percent of allowable stress or tensile and flexural stresses.

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OPERABILITY CRITERIA R MISCELLANEOUS STEEL

3. 2. 2 ~Bol tin The allowable tensile stress for bolting shall be the minimum specified yield stress of the bolt, material. When the yield stress of the bolt material is not specified, the allowable tensile stress shall be 70 percent of the minimum specified ultimate strength. The allowable shear stress for bolting shall be 0.6 of the allowable tensile stress.

3.2.2 Concrete E ansion Anchors The minimum factors of safety for concrete expansion anchors (wedge and shell types) shall be 2.0 (Reference 5.3).

4.0 DOCUMENTATION Engineering evaluations performed to determine the priority of modifications shall be documented in calculations performed in accordance with the applicable Quality Assurance requirements.

5.0 REFERENCES

5.1 Design Criteria for Miscellaneous Steel Components for Class I and II Structres, BFN-50-C-7100, Attachment G 5.2 Specification for the Design, Fabrication, and Erection of Structural Steel Buildings, AISC 7th Editions.

5.3 IE Bulletin 79-02, Revision 1, Suppliment 1 dated August 20, 1979, Pipe Support Base Plate Designs Using Concrete Anchor Bolts 0366c