ML20112D142
| ML20112D142 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 03/20/1985 |
| From: | Spangenberg F ILLINOIS POWER CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| RTR-REGGD-01.061, RTR-REGGD-01.122, RTR-REGGD-1.061, RTR-REGGD-1.122 U-0804, U-804, NUDOCS 8503220239 | |
| Download: ML20112D142 (1) | |
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U- 0804 L-30 -85 (03-20)-L 1A.120 llLINOl8 POWER COMPANY IP CLINTON POWER STAtlON, P.o. 80X 678. CLINTON. ILLINOIS 61727 March 20,1985 y-Docket No. 50-461 Director of Nuclear Reactor Regulation Attention: Mr. A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Clinton Power Station Unit 1 Use of Alternate Damping and Spectral Shifting Criteria
Dear Mr. Schwencer:
This letter is Illinois Power Company's request to implement the spectral shifting and damping recommendations as identified in ASME Code Case N-397 on spectral shifting and ASME Code Case N-411 for damping as altern-atives to guidance in Regulatory Cuides (U.G.) 1.122 and 1.61, respectively.
It is Illinois Power Company's intent to use the criteria in these two code cases as necessary in any future piping and equipment dynamic analysis or reanalysis. These criteria would be used for response spectra type analyses including OBE and SSE and hydrodynamic loads.
For time history type loads such as feedwater pump trips, main steam valve closures, annulus pressurization, etc., the damping criteria in R.G. 1.61 will continue to be used. Also, when the alternative damping criteria are used, they will be used in their entirety in a given analysis and not a mixture of R.C. 1.61 criteria and the alternative Code Case N-411 criteria.
If, as a result of using the damping value in ASME Code Case N-411, piping supports are moved, modified, or eliminated, any increased piping displacements due to the greater piping flexibility will be checked to assure that they can be accommodated and that there will be no adverse interaction with adjacent structures, components, and equipment.
Necessary FSAR changes will be implemented in a future amendment. Your upeditious response is requested and if further information is needed, please contact us.
Sincer y your
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