ML18033A160

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Rev 0 to Civil Engineering Branch Instruction CEB-CI-21.100, Browns Ferry Nuclear Plant Class I HVAC Duct & Duct Support Seismic Qualification Interim Operability Acceptance Criteria.
ML18033A160
Person / Time
Site: Browns Ferry Tennessee Valley Authority icon.png
Issue date: 02/25/1988
From:
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML18033A159 List:
References
CEB-CI-21.100, TAC-R00298, TAC-R00299, TAC-R00300, TAC-R298, TAC-R299, TAC-R300, NUDOCS 8803170016
Download: ML18033A160 (12)


Text

Enclosure 2 "3W~F TENNESSEE VALLEYAUTHORITY Divhkm of Nuclear Englneerhg 84I .'88 0225 001 CIVIL ENGINEERING BRANCH INSTRUCTION CEB-CI 21. 100 TITLF. BFN CLASS I HVAC DUCT AND DUCT SUPPORT SEISMIC OUALIFICATION INTERIM OPERABILITY ACCEPTANCE CRITERIA REVISION RO R2 ISSUE DATE RB 85 l988 PREPARED REVIEWED APPROVED 8803i700i6 880310 PDR ADOCK 05000260 P DCD

t UUHUINR I IVI'i LVV CEB-CI 21.100 BPN CLASS T NVAC OT AND DUCT SUPPORT SELSNTC CUA+TCATTON T' 'NTERIM OPERABILITY ACCEPTANCE CRITERIA enotes review A-Denotes approval Revision: p BRANCH (CEB) INSTRUCTIONS ENGINEERING AND TECHNICAL SERVICES (E&TS)

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BFEP BLEP SQEP WBEP WP PSB R . R A R A R A R A OPERATIONS ENGINEERING ENGINEERING ASSURANCE (EA) DNQA SERVICES (OES)

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REVISION LOC BFN CLASS I HVA UCT AND DUCT SUPPORT SEISi1IC Q IFICATIO Tj tie ~ 'NTERIt i OPERAB ILITY ACCEPTANCE CR ITERIA CEB-CI 21. 100 Revision Date No. DESCRIPTION OF REVISION Approved 0 Original Issue TYA tos34 {EC4 OES 4 78)

BFN CLASS I HVAC DUCT AND DUCT SUPPORT SEISMIC QUALIFICATION INTERIM OPERABILITY ACCEPTANCE CRITERIA CEB-CI 21.100 TABLE OF CONTENTS

~Pa e 1 0

~ PURPOSE ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

2' SCOPE.

3.0 POLICY ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ I ~ ~ ~ ~ ~

4.0 INTERIM ACCEPTANCE CRITERIA......................

5.0 EXCEPTIONS 6.0 DOCUMENTATION.....................,.....,.

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7.0 REFERENCES

TVA I0535 (EN OES-7-77)

BFN CLASS I HVAC DUCT AND DUCT SUPPORT SEISMIC QUALIFICATION INTERIM OPERABILITY ACCEPTANCE CRITERIA CEB-CI 21.100 1.0 PURPOSE The purpose of this criteria is to provide a basis for interim acceptance of existing Class I HVAC ducts and duct supports which do not meet long-term design basis requirements. Ductwork and supports meeting requirements of this criteria shall be considered suitable for interim plant operation until physical modifications can be .made.

2.0 SCOPE This criteria applies to all existing BFN Class I HVAC ducts and duct supports which will require physical modification to meet the long-term design basis requirements given by Design Criteria BFN-50-C-7104, Attachment B.

3.0 POLICY In general, Class I HVAC ductwork and duct supports shall be evaluated to requirements of Section 4.0 herein for interim acceptance. Specific exceptions may be approved on a case-by-ease basis if thoroughly justified and documented by issued supporting calculations in accordance with NEP-3.1. Approved exceptions shall be recorded in Section 5.0 of this document. Each exception shall be assigned a subsection number (e.g., 5 1, 5.2, etc.) along with a brief descriptive title for the specific case to which it applies. Following this shall be a brief

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explanation of the rationale for allowing the exception, a statement of the specific requirements that vary from Section 4.0, and a reference to supporting calculations for the varied requirements. Issuance of exceptions shall be by revisions or CEB Interim Orders to this instruction in accordance with Civil Engineering, Branch Instruction 21-CI 21.02.

Class I ductwork and duct supports which meet the interim acceptance criteria (including approved exceptions) shall be acceptable for interim plant operation; however, mddifications to meet the long-term design basis requirements shall be scheduled and made as expeditiously as possible. Class I ductwork and duct supports failing to meet the interim acceptance requirements herein (including approved exceptions) shall not be allowed for plant operation until modifications are made to meet the long-term design basis requirements.

4.0 INTERIM ACCEPTANCE CRITERIA Requirements of this section and/or Section 5.0 shall be met as the basis for interim acceptance of existing Class I HVAC ducts and duct supports.

Figure 1 provides a logic diagram for applying this criteria.

4.1 DESIGN LOADS Design loads shall be determined in accordance with requirements of Design Criteria BFN-50-C-7104, Attachment B; however, allowable stresses shall be as given below in subsection 4.2.

DNE4 3581M TVA 10535 (EN OES-7-77)

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BFN CLASS I HYAC DUCT AND DUCT SUPPORT SEISMIC QUALIFICATION INTERIM OPERABILITY ACCEPTANCE CRITERIA CEB-CI 21.100 4.2 ALLOWABLE STRESSES 4.2.1 Ductwork The maximum allowable stress in a duct section for load combinations involving the DBE seismic event shall be as follows (Reference 7.1):

o Rectangular duct section stress < 12,000 psi.

o Circular duct section stress < 15,000 psi

'.2.2 Su ort Members and Connections

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The support member stresses shall not exceed the lesser of 1.2 Fy or 0.7 Fu for tensile and flexural stresses and 90 percent of the critical buckling stress as defined in AISC Specifications (Reference 7.2) for axial compression and compression in a flange due to bending. Shear stresses shall not exceed 60 percent of the allowable stresses for tension and flexure.

The stress allowables for bolting shall be the greater of 70 percent of the ultimate strength or the minimum specified yield stress of the bplt material.

4.2.3 Concrete E ansion Anchors Anchorages to concrete shall be evaluated. in accordance with

..interim allowables of Civil Design Standard DS-C1.7.1 where the minimum factor of safety shall be 2.0 for shell and wedge bolt type anchors.

5.0 EXCEPTIONS No exceptions to the requirements of Section 4.0 have been taken as of the RO issue date.

6, 0 DOCUMENTATION Engineering evaluations performed to determine acceptability for interim operation shall be documented by calculations in accordance NEP-3 1. ~

Modifications which may be postponed to after restart shall be tracked by marking "Post-Restart Modification Required" on the calculation cover sheet and on the calculation log.

7.0 REFERENCES

7.1 SWEC calculation No. CD-Q0000-871818, backup calculation for BFN-50-C-7104, RIMS No. B22880204128 7.2 AISC, Manaual of Steel construction, 8th Edition DNE4 3581M TVA 10535(EN OES-7-77)

LOGIC HVAC PROGRAH Wa lkdown Evaluate No System OK and Sketch Walkdown Hods Configuration Information to Design Criteria System Not OK Evaluate Walkdown System OK Information to No for Operability Interim Hods Post Operation Operability Hods to Acceptance Design Criteria Criteria Sys tern Issue PORC Not OK Package Design Package Design Hods Issue PORC to Design Package Design Criteria Package nW I

A FIGURE 1 H