ML17059B244
ML17059B244 | |
Person / Time | |
---|---|
Site: | Nine Mile Point ![]() |
Issue date: | 08/13/1996 |
From: | Gleason T, Mahadevan A, Ranganath S GENERAL ELECTRIC CO. |
To: | |
Shared Package | |
ML17059B240 | List: |
References | |
GENE-B13-01739, GENE-B13-01739-03, GENE-B13-1739, GENE-B13-1739-3, NUDOCS 9608210143 | |
Download: ML17059B244 (22) | |
Text
ENCLOS 4
SUPPLEMENT 1 MILKPOINT 1 SEISMIC ANALYSIS, CORE SHROUD REPAIR MODIFICATION NON-PROPRIETARY VERSION 9b082iOi43 9b08i4 PDR ADOCK 05000220 P
a
CE Nuclear'nergy GENE Bf3417XRV Supplement 1
Classlll August f8%
~EPruprieta~nformation Supplement f Nine Nile Point f Seismic Analysis, Core Shroud Repair Modification Prepared for.
Niagara Mohawk Power CorporatIon Nine MilePoint Unit 1 Prepared by:
GENuclear Energy Reactor Nodjfication Services 175 Curtner Avenue, N/C511 San Jose, California 951ZS
0
GE Nuclear Energy GENE B13-01739-03 Supplement 1
Class III August 1998 Supplement 1
Nine Nile Point 1 Seismic Analysis, Core Shroud Repair Modification Prepared by:
A. Mnhndevnn, Seninr Engineer er/B t n 0'eactor Modification Services Reviewed by:
8'- $'-p t
TE. Gleason, Principal Engineer Reactor Modification Services Approved by:
3 <sag S. Ranganath, Engineering Fellow GE Nuclear Engineering
GENEB1341 RHU Supplement 1
Cisss ill August, 1998 81ON S Revision 0
Approval P. Walier Date Dec. 1994 Initial issue.
Description Suppl.
1 S. Ranganath
- August, 1996 Evaluate revised lower spring spacing.
. /
GENE B1$4D3943 Supplamant 1 Class III August fS98
.ROPRIET Y..INFORMATIO.NOTICE This document contains prop infomiation of the Gen lectric Company (GE) and is furnished to the Niagara Mohawk Power oration (N in confidence solely forthe purpose or purposes stated in the transmittal letter.
No o e, direct or indirect, of the document or the information it contains is authorized. N s
l not pu 'r otherwise disclose this document or the information it contains to oth thout the written consent o and shall return the document at the request ofGE.
The propri
~mar i
mformation contained in this report is designated by "bars" located in the ri and I
IMPORTANT-NOTIC G
CO S OF THIS REPORT Please read carefully 1
This report was prepared by Gcncral Electric solely for the use of thc Niagara Mohawk Power Corporation.
The information contained in this report is believed by General Electric to be an accurate and true representation of the facts known, obtained or provided to General Electric at the time this report was prepared.
The only undertakings ofthe General Electric Company respecting the information in this document are contained in thc contract governing this work, and nothing contained in this document shall bc construed as changing said contract.
The use ofthis information except as defined by said contract, or for any purpose other than that for which it is intended, is not authorized; and with respect to any such unauthorized use, neither General Electric Company not any ofthe contributors to this document makes any representation or warranty (express or implied) as to the completeness,
- accuracy, or usefulness of the information contained in this document or that such use of such information may not infringe upon privately owned rights; nor do they assume any responsibility for liability or damage ofany kind which may result &om such use ofsuch information.
~Nmprietasylokanstian GElIlEB13403943 Supplement 1
Cliss III August,'1998 CONT&MTS INTRODUCTIONooooooooooooooooooooooooe ooooooo ooo oioooooooooooooooooooo~oooooooooo~oooo oooooooo
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SUMMARY
ANDCONCLUSIONS ANALYSIS RESULTS~oo~~~ ~~
REFERENCES
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8ENE81341 3947 SuplJlement1 Classlll August,;1Hf 1.
INTRODUCTION Thc purpose ofthis supplement to the seismic analysis is to address the change in the spacing between lower spring on the shroud repair hardware. Lower springs located at 90'ntervals have the same equivalent spring constant in any direction ofthc applied load. Spacing greater than 90'etween two adjacent springs tends to decrease the equivalent spring constant for loads applied between thc two. Spring spacing less than 90'ends to increase thc equivalent spring constant for loads applied between the two. Relocating the 270'ower spring to the opposite side ofthe tic rod, along with changes made prcvioulsy, result inthe maximum spring spacing increasing to108'nd the minimum spacing between springs decreasing to 76'.
2.
SUMMARY
ANDCONCLUSIONS
I q
GENE B13417%49 Supplement 1
Cless///
- August, 1896'.
ANALYSIS The as-built locations ofthe tie rods are at azimuths.90',-1 66'-,.270', and 350'.. The lower stabilizer is attached to one side ofthe tie rod assembly (consistcnt side) at all four tie rod locations. The lower stabilizer at the 270'ie rod location, however, was found to be contacting the RPV at the'bend radius ofthe rcciculation pipe nozzle, resulting in partial bearing against the RPV. In order to remedy this, the lower stabilizer spring at this tie rod location is proposed to be removed and re-attached to the
'other'ide ofthe tie rod assembly. This would result in the lower stabilizers being apart as follows:
350'0' 166'66' 274'74' 350'50'90'6O
=
108'6O
=
100'odif.
Stabil. Locn.
270'rig.
Stabil. Locn.
40
/ WQ~
A I
904 Lower Stabilizer Minimum Angle Spread
=
76'aximum Angle Spread
=
108' Tic Rod The nominal lower stabilizer stiffhess used in seismic analysis is based on 90'pread. The minimum angle spread of76 (Load direction B) results in upper bound net stabilizer stiffness and the maximum angle spread of 108'Load direction A) results in lower bound nct stabilizer stiffness.
Analysis was performed to assess the impact ofthe variation ofthe lower stabilizer stiffness (bounded by these upper and lower bound stabilizer stiffnesses) on the hardware seismic loads and displace ments.
GENEBf341ÃRRU Supp/ament 1 Class Ill August', t998 3.1 Lower StablHzer Stiffness 4.
RESULTS The resulting hardware loads, displacements, loads in key internal components, and shroud frequencies are surninarized in Table l.
The displacements are withinthe allowables specified in the design specification (Reference 2). The hardware loads willbe reconciled separately by comparing against the design loadslmargins. The loads on key internal components are also suinmarized and are less than or equal to the loads based on uncracked, unmodified shroud. The shroud frequency shifts due to the stiffness changes are very small and moreover, they are in the frequency range where the spectral amplitudes are almost flat or mildlyramping, thus resulting in the above insignificant effects.
CENEB134fAMB Supplement 1
Cljkslll Augu+ 1998 (ii) 5.
REFERENCES 5.1.
Nine MilePoint 1: Seismic Analysis -Core Shroud Repair Modification, Report Number:
GENE-B13-0173943, Revision 0.
5.2.
Design Specification - Shroud Repair, GE Document No. 25A5583.
GE Nuclear Energy GENE-B13-01739-03 Supplement 1
August, 1996 Table 1 NMP 1 Shroud Repatr: Selemlc Analysis - Lower StabNzer StNnesa Parametrfc Study