ML18033A196

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Rev 1 to Civil Engineering Branch Instruction CEB-CI 21.100, Brown Ferry Nuclear Class I HVAC Duct & Duct Support Seismic Qualification Interim Operability Acceptance Criteria.
ML18033A196
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 03/31/1988
From:
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML18033A195 List:
References
CEB-CI-21.100, NUDOCS 8805120068
Download: ML18033A196 (8)


Text

ENCLOSURE 3 et'.0f +

RIMS // B41 B8O'4P1 PP3 TENNESSEE VALLEY AUTHORITY oval Division of Nuclear Fngineerlng t~ l, s.

CIVIL ENGINEERING BRANCH INSTRUCTION CEB-CI 21.100 TP'l Pe BFN CLASS I HVAC DUCT AND DUCT SUPPORT SEISMIC QUALIFICATION INTERIM OPERABILITY ACCEPTANCE CRITERIA RF-VlSlON RO R3 R4  : R5-lSSUF. DATE Feb. 25, 1988 s/~./es-PREPARED F. F. K. Lee REVIEWED A. V. Chan APPROVED D. R. Denton ccrc RIMS,Sl.25 C K C

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REVISION LOG BFN CLASS I HVAC DUCT AND DUCT SUPPORT SEISMIC

Title:

QUALIFICATION OPERABILITY ACCEPTANCE CRITERIA CEB-CI 21.100 Revision Dote No. DESCRIPTION OF REVISION Approved Revised allowable stress limi,ts for bolting material to reflect US-NRC comments in a meeting on March 17, 1988 in Rockville, Xg rr/IJ Maryland.

TVA to534 {EN DES&.76)

l BFN CLASS I HVAC DUCT ~UCT SUPPORT SEISMIC QUALIFICA N INTERIM OPERABILITY ACCPPFANCE CRITERIA CEB-CI 21.100 TABLE OF CONTENTS

~Pa e 1 0

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

2~0 SCOPE ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ t ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

3.0 POLICY ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 0 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

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

5 ~0 EXCEPTIONS ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 2 l

6.0 DOCUMENTATION......................................... ~ ~

7.0 REFERENCES

........... ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 2 DNE4 3581M

r BFN CLASS I HVAC DUCT ~DUCT SUPPORT SEISMIC QUALIFICA N INTERIM OPERABILITY ACC~ANCE 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 shal'l be evaluated to requirements of Section 4.0 herein for interim acceptance. Specific exceptions may be approved on a case-by-case 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 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 1nstruction 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, modifications 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.

'NE4 3581M

BFN CLASS I HVAC DUCT ~ DUCT SUPPORT

'INTERIM OPERABILITY AC~ANCE CRITERIA SEISMIC QUALIFIC N 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 'ircular duct section stress < 15,000 psi 4.2.2 Su ort Members and Connections 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 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.

4.2.3 Concrete E ansion Anchors Concrete expansion anchors shall be evaluated in accordance with section 10.2.1 of Civil Design Standard DS-Cl;7.1 where the minimum factor of safety shall be 2.0.

~ 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.'.2 AISC, Manual of Steel construction, 8th Edition 2 DNE4 3581M

LOGIC HVhC PROGlVCf Malkdown Evaluate No System OK and Sketch Walkd own Mods Configuxation Information to Design Criteria System Not OK Evaluate Nalkdovn System OK Information to No for Operability Interim Mods Post Operation Operability Nods to Acceptance'riteria Design Criteria System Issue PORC Not OK Package Design Package Design Nods Issue PORC to Design Package Design Criteria Package FIGURE l

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