ML20215E097
| ML20215E097 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 12/11/1986 |
| From: | Tam P Office of Nuclear Reactor Regulation |
| To: | Sieber J DUQUESNE LIGHT CO. |
| References | |
| TAC-62966, NUDOCS 8612170267 | |
| Download: ML20215E097 (4) | |
Text
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Dec;mb r 11,1986 ry Docket No. 50-334 DISTRTRilTION g'6 E. Jordan
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NRC~PDR R. Grimes Local PDR J. Partlow Mr. 'J. D. Sieber, Vice President PAD #2 Rdg N. Thompson-Duquesne Light Company T. Novak P. Tam
' Nuclear Operation 0GC-Bethesda D. Miller Post Office Box 4 ACRS (10)
H. Brammer Shippingport, PA 15077 Gray File
Dear Mr. Sieber:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - BEAVER VALLEY UNIT 1. USE OF ASME CODE CASE N-411 (TAC 62966)
By letter dated September 15, 1986 you requested NRC authorization to use the I
subject code case for seismic piping analysis..Our review of that request is ongoing.
Although you have provided several acceptable commitments relative to the use of Code Case N-411, we would need additional commitments which are outlined
.in the enclosure. Please provide your response within 45 days of your receipt of this letter. Feel free to contact me if you need any clarifications.
This infomation request affects fewer than 10 respondents, therefore, OMB clearance is not required under P.L.96-511.
Sincerely, Original Signed by Peter S. Tam, Project Manager Project Directorate No. 2 Division of PWR Licensing-A Office of Nuclear Reactor Regulation
Enclosure:
As stated cc: See next page LRube%
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Mr. J. D. Sieber Beaver Valley 1 Power Station Duquesne Light Company cc:
Mr. W. S. Lacey Pennsylvania Power Company Station Superintendent James R. Edgerly Duquesne Light Company Post Office Box 891 Beaver Valley Power Station New Castle, Pennsylvania 16103 Post Office Rox 4
.Shippingport, Pennsylvania 15007 Mr. Jess T. Shumate, Commissioner State of West Virginia Department Mr. S. Sovick, Acting Supervisor of Labor of Licensing 1800 Washington Street, East Duquesne Light Company Charleston, West Virginia 25305 Post Office Box 4 Shippingport, Pennsylvania 15077 David K. Heydinger, M.D.
State Director of Health Mr. John A. Levin State Department of Health Public Utility Commission 1800 Washington Street, East Post Office Box 3265 Charleston, West Virginia 25305 Harrisburg, Pennsylvania 17120 Regional Administrator, Region I Gerald Charnoff, Esquire U.S. Nuclear Regulatory Commission Jay E. Silberg, Esquire 631 Park Avenue Shaw, Pittman, Potts and Trowbridge King of Prussia, Pennsylvania 19406 2300 N Street, N.W.
Washington, DC 20037 Mr. R. Janati Bureau of Radiation Protection Charles E. Thomas, Esquire Pennysivania Department of Thomas and Thomas Environmental Resources 212 Locust Street P.O. Box 2063 Box 999 Harrisburg, Pennsvivania 17120 Harrisburg, Pennsylvania 17108 John D. Rurrows, P.E.
Marvin Fein Director of Utilities Utility Counsel State of Ohio City of Pittsburgh Public Utilities Commission 313 City-County Building 180 East Broad Street Pittsburg, Pennsylvania 15219 Columbus, Ohio 43266-0573 Resident Inspector U.S. Nuclear Regulatory Commission Post Office Box 298 Shippingport, Pennsylvania 15077
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l' sV Request for Additional Infomation Beaver Valley, Unit 1 Docket Number 50-334 In a letter from J.D. Sieber to Director of NRR, dated September 15, 1986, the licensee requested staff approval to use the damping values in ASME Code Case N-411 for current piping modifications and future piping stress analyses.
In addition to the conditions which are listed in the above letter, the staff requires a comitment to the following conditions prior to use of the new damping values:
1.
When the damping values of Code Case N-411 are used, they will be used in their entirety in a given analysis and shall not be a mixture of Regulatory Guide 1.61 criteria and the alternate criteria of this Code Case.
2.
For equipmer.t other than piping, the damping values specified in Regulatory Guide 1.61, " Damping Values for Seismic Design of Nuclear Power Plants," should be used.
3.
The damping values specified in Code Case N-411 may be used only in analyses which assume an upper bound envelope of the individual response spectra for all support locations to calculate maximum inertial responses of multiply-supported items.
4.
Where predicted maximum piping displacements using Code Case N-411 criteria exceed the current design calculations by an amount greater than acceptable tolerance levels, a physical verification of the availability of adequate clearance with adjacent structures, equipment and components must be perfomed.
For equipment mounted on piping, such as valves with extended structures, proper account must be taken for both rotation and translation in arriving at the predicted maximum displacement at the extremo ends of the pipe mounted equipment.
t I
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i 5.
It must be verified that the operability qualification level of pipe mounted equipment is not exceeded by the predicted response using Code Case N-411.
6.
Where the existing design loads of piping supports are exceeded by the new loads predicted by the use of Code Case N-411, it must be verified that the new loads do not exceed the design capacity of the supports.
7.
It must be verified that the cumulative effect of the changes of loads on piping supports that are in turn supported by a structural element of a building, such as walls, slabs, beams and columns does not exceed the load carrying capacity of the affected structural element.
8.
The FSAR and other applicable documents must be amended to identify the licensee's request for the application of Code Case N-411 and the staff's approval of the request. The application of Code Case N-411 shall be described in the FSAR and a commitment shall be included in the FSAR to maintain in the licensee's engineering records a current list and individual files of all pipe stress packages reanalyzed using Code Case N-411.
Provide a proposed revision to the Beaver Valley Unit 1 Updated FSAR incorporating the use of Code Case N-411 subject to the six conditions listed in the above referenced letter plus the eight additional conditions listed above. In addition, with respect to item 2 in the referenced letter, verify that the in-structure response spectra for Reaver Valley, Unit 1 are consistent with current ground motion description and soil structure interaction analysis procedures.
Principal contributor H. Brammer