ML18033A191

Rev 1 to Civil Engineering Branch Instruction CEB-C1.102, Operability Criteria for Miscellaneous Steel.

ML18033A191
Person / Time
Site:	Browns Ferry
Issue date:	03/31/1988
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML18033A190	List: ML18033A189 ML18033A191
References
B41-880401-002, B41-880401-2, CEB-C1.102, NUDOCS 8805050089
Download: ML18033A191 (6)

Text

ENCLOSURE 2 QA Record RIMS II B41 880401 002 TVA Tennessee TENNESSEE VALLEY AUTHORITY Valky Division of Nuclear Engineering Authority CIVIL ENGINEERING BRANCH INSTRUCTION CEB-C1.102 OPERABILITY CRITERIA FOR MI REVISION RO R1 R2 R3 ISSUE DATE March .3, 1988 ~ far PREPARED Mahendra J- Shah jS-8'vJ CHECKED E. Evans REVIEWED A. W. Chan APPROVED D. R- Denton

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REVlSION LOG

Title:

OPERABILITY CRITERIA FOR MISCELLANEOUS STEEL CEB-C1.102 Revision Dote No. DESCRIPTION OF REVlS1ON Approved Revised allowable stress limits for bolting material to reflect US-NRC comments in a meeting on March 17, 1988 in Rockville, Maryland.

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CEB-C1.102 TABLE OF CONTENTS PAGE 1.0 PURPOSE 2.0 SCOPE 3.0 MISCELLANEOUS STEEL EVALUATION CRITERIA 4.0 DOCUMENTATION

5.0 REFERENCES

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OPERABILITY CRITERIA FOR MISCELLANEOUS STEEL CEB-C1.102 1.0 'URPOSE 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-SO-C-7100, Attachment G (Reference 5.1). Modifications will be prioritized into two groups: those that require implementation 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 that must be made before restart. Design criteria modifications are 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, the miscellaneous steel modifications that do not meet design criteria shall be evaluated only for Loading Condition 8, shown below, in accordance with BFN-50-C-7100, Attachment G.

Abnormal Accident + DBE (Seismic) =

DL + LL + Ta + Ra + Pa + 1.0(Yg + Yr + Ym) +

E'.2 ALLOWABLE LIMITS The following limits shall be used to establish priorities for modifications to miscellaneous steel; 3.2.1 Structural Steel Members Stresses in structural steel members shall not exceed the lesser of 1.2Fy 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 for tensile and flexural stresses.

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OPERABILITY CRITERIA FOR MISCELLANEOUS STEEL CEB-C1.102

3. 2. 2 ~30 it ikk The allowable 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 stress shall be 70 percent of the minimum specified ultimate strength.

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

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

5.0 REFERENCES

5.1 Design Criteria for Miscellaneous Steel Components for Class I and II Structures, BFN-50-C-7100, Attachment G 5.2 Specification for the Design, Fabrication, and Erection of Structural Steel Buildings, AISC 7th and 8th Editions 5.3 IE Bulletin 79-02, Revision 1, Supplement 1 dated August 20, 1979, Pipe Support Base Plate Designs Using Concrete Anchor Bolts DNE4 4237M