ML19254D955
| ML19254D955 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 09/28/1979 |
| From: | STONE & WEBSTER, INC. |
| To: | |
| Shared Package | |
| ML19254D952 | List: |
| References | |
| NUDOCS 7910300360 | |
| Download: ML19254D955 (15) | |
Text
{{#Wiki_filter:. . e SECOND SUPPLD4ENT TO JUSTIFICATION OF MAPI II LEAD PLANT
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SRV LOAD DEFINITION
- EQUIPMEIT EVALUATION -
Septe:nber 28, 1979 STONE & WEBSTER 1229 i49
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7910300 3 6 0
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TABLE OF CONTETTS
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SECTION PAGE,
- 1. INTRODUCTION 1
- 2. FLOOR MOUNTED EQUIR4E!T 2 2.1 Qualification by Analysis 2 2.2 Qualification by Test h 3 PIPE MOUNTED EQUIR4ENT 4
- 4. CONCLUSION 5
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- 1. INTRODUCTION The report entitled " Justification of Mark II Lead Plant SRV Load Definition" submitted to the NRC on March 30,1979 (SNRS-37h) contains a demonstration of the conservatism present in the Ra=shead Load Def-inition. That report along with additional information subsequently submitted (SNRC-396 May 30, 1979) clearly deaanstrates that piping system response resulting from the Ramchead Load Def!nition is greater than response resulting from a conservatively constructed T-Quencher load def-inition. This supplemental report has been prepared in response to the NRC request for a similar demonstration specifically addressing reactor
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building equipment. Before presenting the detailed results for equipment it is important to review briefly the primary conservatisms contained in the T-Quencher load definition used as the basis of comparison with the . Ramshead Load Definition. They can be su=marized briefly as follows:
- 1. Bubbles are assu=ed to enter the pool st=ultaneously.
- 2. Bubbles are assumed to oscillate in phase.
- 3. The predominant oscillation frequency is svept through a frequency range of 3 to 9 Hz with results throughout the range enveloped.
- h. A pressure a=plitude multiplier of 1.1 is applied to the actual test measured pressure traces.
5 Four discharge cases - all valves, ADS, asymmetric (3 adjacent valves), and single valve - are independently analyzed and results are enveloped. The first four of these features have been e=phasized previously while the importance of the fifth may not have been stressed. It causes the greatest sym=etric r.nd asy= metric results to be applied simultaneously. This conserva-tism is used as a design convenience for both piping and equipment such that results may be used in any SRV load combination. On this basis a detailed study of equipment has been performed. Since the original report demonstrated that the only potential for the T-Quencher results to exceed Ramshead results is for components with lov (less than L Y' 5k
-. , __ _ .. __.._ _ . . . . - . . . .. .. . . . . _ 2.
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about 7 Hz) fundamental frequencies, this vill be the area concentrated on herein. Equipment qualified both by analysis and by test is addressed in the following sections.
- 2. FLOOR MOUNTED EQUIPMENT Before presenting details of the equipment evaluation, one important aspect of the qualification of equipment in the Shoreham plant should be pointed out. The original seisnic qualification was based on equipment damping values lover (more conservative) than that required by NRC Regulatory Guide 1.61. Damping values of 1/2% and 1%
were used for UPSET and FAULTED conditions respectively. This has resulted in a margin of safety in the lov frequency range which is suf-ficient to cover the combined seismic and hydrodynamic results inde-pendent of the SRV discharge device. For Mark II load evaluations the controlling UPSET and FAULTED condition load combinations used are N + SRV + OBE and N + SRV + LOCA + SSE respectively where N refers to ncrmal operating loads and SRV is the envelope of all SRV discharge cases as stated previously. LOCA is also the envelope of all LOCA subevents - vent clearing, condensation oscil-lations, and chugging. Regulatory Guide 1.61 damping values of 2% and h% respectively are used for all loada in each combination. 2.1 Qualification by Analysis Mechanical equipment is requalified for Mark II loads by static analysis to equivalent dynamic loads (static coefficients) obtained from enveloping the dynamic responses of several repre-sentative equipment models. A static coefficient curve resulting from the dynamic analyses relates the equivalent static load on a component to the fundamental frequency of the component. The effects of the higher modes are thereby si= ply accounted for in subsequent evaluations. This method as applied to seismic analysis has been described in the Shoreham FSAR (section 3.7.3 5.lA) and as extended for Mark II loads in the Shoreha= DAR (section 9.1.2.3.3). i52
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3. Static coefficient curves for UPSET and FAULTED conlitions have been redeveloped using the T-Quencher load definition and are presented in Figures 1 and 2 for the primary containment and in Figures 3 and h for the secondary containment. The T-Quencher based static coefficients exceed the Ramshead based coefficients only for primary contain=ent equipment with a fundamental fre-quency belov about 3 Hz. The reason that the exceedance does not occur through the range of approximately 2 to 7 Hz vhere T-Quencher ARS exceed Ramshead ARS is the same reason that applies for piping systems. That is, the fundamental mode is not the sole contributor to the total stress in any component. Higher modes where the Ramsherd response exceeds the T-Quencher response also contribute, thereby off-setting the effect of the fundamental mode. The reason that there can be same net exceedance for equipment is that typical pieces of equipment are less complex dynamic systems than piping systems are. Therefore, the fundamental mode may be relatively more important than it is for piping. A review of Shoreham reactor building (primary and secondary contain-ment) equipment indicates that there are no components which fall into this special situation where T-Quencher results could exceed those from the Ramshead. There is no floor mounted equipment with a fundarental frequency less than 3 Hz located in the primary contain-ment and qualified by analysis. Eqaigent in the primary containment includes cable tray, conduit, and duct systems as well as excess flow check valves. All of these components have fundamental frequencies greater the.n 10 Hz. For floor mounted equipment in the secondary containment, the Ramshead results bound T-Quencher results for all frequencies. Further= ore, as stated earlier, any reactor building equipment in this low frequency range would be designed to higher static coef-ficients corresponding to lover seismic damping values. The level of the original design curves in this frequency range is shown in 1229 i53 --.
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,.. . .. . . . _ _ . . . . . _ . , . . .___ _ _ _ . . h. Figures 5 and 6 for the primary containment. The sz=e' relation-ship is true in the secondary containment. As.can be seen in Figures 5 ,.i 6 there is a sufficient margin of safety in the lov frequency range of the original design curve 'to cover the effects of either the Ra=shead or T-Quencher discharge device. 2.2 Qualification by Test Class lE floor-mounted electrical equipment in the secondary contain-ment is qualified by test at the assembly level (rack, panel, etc. ) if possible or by a ccebination of device (relay, switch, etc.) test-ing with analysis to obtain the loads acting in the device mounting base. The very small amount of lE floor-mounted electrical equipment in the primary contain=ent is qualified by single frequency testing. Input loading for testing is quantified from the required response spectrum (RRS) corresponding to the locatio,n of the equipment. For single frequency testing, the peak input acceleration must be equal to or greater than the acceleration at the high frequency end of the spectra, that is, the zero period acceleration (ZPA). Inspec-tion shows the ZFA of the ra=shead spectra always to be larger than that ol' the T-Quencher epectra. For multifrequency testing, the input acceleration time history must be shaped so that its response spectra, the test response spectra (TRS), envelopes the RRS between the equipment fundamental frequency and the ZPA asymptote. The means of developing the TRS is such that its magnitude over the entire frequency range is governed by the lov frequency peaks. This is demonstrated in Figures 7 and 8 for the lovest frequency (h Hz) component in the secondary containment by multifrequency testing. As can be seen, the TRS developed to enco= pass the orig-inal seismic peaks provides ample conservatism te cover all Mark II loads above k Hz, intependent of the SRV discharge device. It is thus shown that the ramshead spectra is bounding for the qualification by test of Class lE floor-mr.mted electric equip-ment in the reactor building. 122"? I54
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- 3. PIPE MOUNTED EQUIP'ENT The response of pipe mounted equipment to seismic and hydrodynamic loads is detemined by the dynamic response of the piping system (which includes the equipment component). This has been addressed in detail in the orig-inal report and in the addition 1 information submitted specifically addressing lov frequency piping systems. The conclusions reached there for the piping systems are inherently true for pipe mounted equipment as for any component of the piping system. Specifically, since the piping system response is contributed to by a large number of modes, the higher T-Quencher response at a few low frequency modes is not sufficient to cause the total stress from the T-Quencher loads to exceed the total stress from the Ramshead loads,
- b. CONCLUSION This supplement to the original SRV Ramshead Load Definition Justifica-tion report has specifically addressed the relative effects of Ramshead versus T-Quencher loads on reactor building equipment. The same trends that vere found in the piping evaluation are also found for equipment.
The predominant effect on both is an increasing relative importance of T-Quencher loads with decreasing fundamental frequency of the component. For piping it was shown that for lov frequency systems even though the T-Quencher became relatively more important, the Ramshead was still bounding. For equiTeent it has been shown herein that for the special situation of floor mounted equipment with a fundamental frequency less than 3 Hz located in the primary containment and qualified by analysis the T-Quancher results could exceed Ramshead results. However, Shoreham has no equip: tent components in this situation and furthermore, Icv fre-quency equipment in general has been designed to conservative seismic loads which bound both Ramshead and T-Quencher results. On this basis it is considered to be evident that all reactor building equipment requalified to Mark II loads including the SRV Ramshead Load Definition vill be able to sustain the effects resulting frcx:: SRV dis-charge with a T-Quencher device. This has been demonstrated herein using several conservative assumptions o1 the nature of the T-Quencher load. hE
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