ML20106J252
| ML20106J252 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/26/1984 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| 2NRC-4-177, NUDOCS 8411010141 | |
| Download: ML20106J252 (3) | |
Text
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'Af Duquesne UcJit 2NRg,7,;
Oco$er2 1984 u
152 s United States Nuclear Regulatory Commission Washington, Df' 20555 ATTENTION:
Mr. George W. Knighton, Chief Licensing Branch 3 Of fice of Nuclear Reactor Regulation
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 Mechanical Engineering Branch Question 210.31 Response Gentlemer.-
As discussed in the October 2, 1984, meeting with the Mechanical Engineering Branch, this le t ter fo rward s a revised, more-detailed response to FSAR Question 210.31 (Draft SER Open Item 40).
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Upon completion of your review, please immediately inform us of the status of this response.
DUQUESNE LIGHT COMPANY By E. {J. ' Woo leve r Vice President JJS/wjs At tachment ec:
Ms. M. Ley, Project Manager (w/a)
SUBSCRIBED AND S RN BEFORE ME THIS 44d[ BAY OF
, 1984.
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L Notary Public ANITA ELAINE hEITER, flOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1986 8
8411010141 841026 PDR ADOCK 05000412 E
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-Unit 0d Stctos Nuciscr Raguictcry Conniosien
Mr. G urge W. Knighton, Chisf-
'Page 2 COMMONWEALTH OF PENNSYLVANIA ')
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COUNTY OF ALLEGHENY
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On this.2 k day of G
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, before me, a Notary Public in and for said Commonwealth and County, personally appeared
- E. J. Woolever, who being duly sworn, deposed and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal oc behalf of said Company, and (3) the statements set forth in the Submittal. are true and correct to the best of his knowledge.
1 Notary Public ANITA ELAINE REITER, NOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXP1RES OCTOBER 20,1986
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Question-210.31 (Section 3.9.3)-
The staf f finds that - there is insuf ficient ' information describing the design of safety-related HVAC ductwork and suppo rt s. - Provide the design basis _ used - for qualifying the HVAC -ductwork and support -structural
. integrity.
Response
Design 'of _ safety-related' duct follows guidance provided by SMACNA (Sheet Metall and Air Conditioning Contractors National; Association, Inc.), and Industrial Duct Construction Standards, for allowable combination of gage,
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stif fness, joints,' and seass.
Seismic ' design is facilitated by providing support s and support spans to
' assure nonresonant response as defined by the applicable building Amplified Response Spectra (ARS). Each support typically provides at 1 ast transverse restraint (2 orthogonal-directions).
Axial restraint is provided at ~ 1e as t at eve ry third support.
The analytical methods used and the rigid range response ' of duct / duct suppo rt systems are confirmed by on-site testing results (Reference 1).
Rigid range acceleration for this plant does not-exceed 0.64 g.
Testing of maximum duct spans included the application of 0.64 g equivalent seismic loading in concert with 1.0 g for deadicad.
' Therefore, duct adequacy for the full design seismic plus deadweight loading was verified.
Duct system fundamental frequencies are calculated' to assure rigid range response.as - noted above. ' The design of seismically qualified duct support s is based upon the appropriate acceleration selected from the non-resonant range of! the applicable building ARS, with consideration of duct spans, weight, duct properties, and adjacent suppo rt s.
An equivalent static load method of analysis is used with the applicable response in each of three orthogonal directions combined by SRSS. The resulting loads are considered to occur simultaneously with deadioad. Suppo rt frame design was based upon satisfaction of AISC (7tl. edition) limits.
Reference:
(1) SWEC Report ENTR-616.
Evaluation of Field Testing of Selected HVAC Ducts at Beaver Valley Nuclear Power Station
- Unit 2, July.1984.
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