ML20138L162

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Quantitative Piping Experience Data Supporting Results of Millstone III Nuclear Power Plant Interaction Study
ML20138L162
Person / Time
Site: Millstone Dominion icon.png
Issue date: 10/31/1985
From:
EQE, INC.
To:
Shared Package
ML20138L151 List:
References
NUDOCS 8510310208
Download: ML20138L162 (89)


Text

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QUANTITATIVE PIPING EXPERIENCE DATA SUPPORTING p' THE RESULTS OF THE MILLSTONE Ill NUCLEAR POWER PLANT SEISMIC INTERACTION STUDY F

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Prepared for: NORTHEAST UTILITIES SERVICE COMPANY October 1985 eso1888!Budga A

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EQE INCORPORATED /121 SECOND STREET / SAN FRANCISCO, CA 94105 / (415) 495-5500 TELEX 296166 l

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Quantitative Piping Experience Data Supporting the Results of the Hillstone III Nuclear Power Plant Seismic Interaction Study 3

I October 1985 1

Prepared for:

  • NORTHEAST UTILITIES SERVICE COMPANY P.O. BOX 270 HARTFOP.D. CT 06141-0270 i.

Prepared by:

EQE Incorporated 121 Second Street San Francisco, CA 94105

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CONTENTS EXECUTIVE

SUMMARY

......................................... 1

1. INTRODUCTION .............................................

1-1

2. EL CENTRd STEAM PLANT UNIT 4 PIPING ...................... 2-1 2.1 General Description of Piping .................... 2-1 2.2 Summary of Piping Damage ......................... 2-2
3. PARAMETRIC COMPARISON OF THE MILLSTONE III CATEGORY 2 PIPING .................................................. 3-1 3.1 Compari son of Seismic Input . . . . . . . . . . . . . . . . . . . . . . 3-1 3.1.1 Ground Motion Response Spectra ........... 3-2 3.1.2 In-Structure Response Spectra ............ 3-6 3.1.3 Seismic Anchor Movement .................. 3-9 3.2 Comparison of Piping Parameters .................. 3-11 3.2.1 Cb.7parison of Piping Material s . . . . . . . . . . . 3-12 3.2.2 Comparison of Piping Sizes ............... 3-14 3.2.3 Comparison of Piping Operating Conditions ............................... 3-14 P 3.2.4 Comparison of Piping Components and Construction ............................. 3-25 3.3 Comparison of Support Parameters ................. 3-43 t

3.3.1 Support Spacing .......................... 3-43 3.3.2 Comparison of Support Types and Design ... 3-52

4. Conclusions .............................................. 4-1 References ................................................ R-1 Appendix A: El Centro Steam Plant Unit 4 Pipe Line List

CONTENTS (Continued) i i

FIGURES 3-1 Comparison of El Centro N-S Response Spectrum with I Millstone III Horizontal Design Ground Response

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Spectrum, 7% Damping ..................................... 3-3 i, 3-2 Comparison of El Centro E-W Response Spectrum with Millstone III Horizontal Design Ground Response Spectrum, 7% Damping ..................................... 3-4 3-3 Comparison of El Centro Vertical Response Spectrum with

, Millstone III Vertical Ground Response Spectrum, 7% Damping ............................................... 3-5 3-4 Elevation Drawing, looking North, of the El Centro Steam Pl ant, Unit 4 (Reference 5) . . . . . . . . . . . . . . . . . . . . . . . . 3-10 3-5 El Centro Plant Piping Material Specifications ..... . . . . .. 3-13 3-6 El Centro Plant Piping Sizes, All Schedules . . . . . . . . . . . . . . 3-15

- 3-7 El Centro Plant Piping Sizes, Schedule 10 . . . . . . . . . . . . . . . . 3-16 3-8 El Centro Plant Piping Sizes, Schedule 20 . . . . . . . . . . . . . . . . 3-17
3-9 El Centro Plant Piping Sizes, Schedule 30 . . . . . . . . . . . . . . . . 3-18 I. 3-10 El Centro Plant Piping Sizes, Standard Weight . . . . . . . . . . . . 3-19 i

3' 11 El Centro Plant Piping Sizes, Schedule 40 . . . . . . . . . . . . . . . . 3-20 3-12 El Centro Plant Piping Sizes, Schedule 80 . . . . . . . . . . . . . . . . 3-21 l.

3-13 El Centro Plant Piping Sizes, Schedule 120 . . . . . . . . . . . . . . . 3-22 l '

. 3-14 El Centro Plant Piping Sizes, Schedule 160 ............... 3-23 L

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3-15 El Centro ' Plant Pipe Operating Pressures, All Schedules .. 3-24 l'

} 3-16 El Centro Plant Pipe 0perating Pressures, Schedule 10 .... 3-26 s.

3-17 El Centro Plant Pipe Operating Pressures, Schedule 20 .... 3-27 3-18 El Centro Plant Pipe Operating Pressures, Schedule 30 .... 3-28 l . 3-19 El Centro Plant Pipe Operating Pressures, Standard l,_ Weight ................................................... 3-29

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3-20 El Centro Plant Pipe Operating Pressures, Schedule 40 .... 3-30 3-21 El Centro Plant Pipe Operating Pressures, Schedule 80 .... 3-31 j 3-22 El Centro Plant Pipe Operating Pressures, Schedule 120 ... 3-32 I

3-23 El Centro Plant Pipe Operating Pressures, Schedule 160 ... 3-33 L- 3-24 El Centro Plant Pipe Operating Temperatures, Al l Sched ul e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34 i

3-25 El Centro Plant Pipe Operating Temperatures,

! S c h ed t t l e 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35 3-26 El Centro Plant Pipe Operating Temperatures, Schedule 20 .............................................. 3-36 F 3-27 El Centro Plant Pipe Operating Temperatures,

~b S c h ed u l e 3 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37 1

3-28 El Centro Plant Pipe Operating Temperatures,

. Standard Weight .......................................... 3-38 i

i 3-29 El Centro Plant Pipe Operating Temperatures, S c h ed u l e 4 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39

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s CONTENTS (Continued)

. 3-30 El Centro Plant Pipe Operating Temperatures,

,. Schedule 80 .............................................. 3-40 3-31 El Centro Plant Pipe Operating Temperatures, Schedule 120 ............................................. 3-41 i-

3-32 El Centro Plant Pipe Operating Temperatures, Schedule 160 ............................................. 3-42 3-33 El Centro Plant Pipe Horizontal Support Spacing, t

!. Liquid Fill ed Pipes, All Schedules . . . . . . . . . . . . . . . . . . . . . . . 3-48 I 3-34 El Centro Plant Pipe Vertical ~ Support Spacing, Liquid Filled Pipes, All Schedules ....................... 3-49 3-35 El Centro Plant Pipe Horizontal Support Spacing, Air or Steam Pipes, All Schedules ........................ 3-50

,e 3-36 El Centro Plant Pipe Vertical Support Spacing, j Air or Steam Pi pes, All Schedul es . . . . . . . . . . . . . . . . . . . . . . . . 3-51

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CONTENTS (Continued)

TABLES 3-1 Comparison of El Centro versus Millstone Spectral Displacements ............................................ 3-8

, . 3-2 Maximum Spans for Millstone III Category 2 Small Bore, I

. Carbon / Stainless Steel Piping ............................ 3-44 3-3 Alternate Maximum Spans for Millstone III Category 2 Small Bore Carbon / Stainless Steel Piping . . . . . . . . . . . . . . . . . 3-45 3-4 Maximum Spans for Millstone III Large Bore Piping from ANSI /ASME B31.1 ..................................... 3-47

"- 3-5 El Centro Pl ant Pi pe Supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-53 3-6 Millstone III Category 2 Pipe Supports ................... 3-54 I

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,. EXECUTIVE

SUMMARY

A seismic interaction study of the Millstone III Nuclear Power Plant has been conducted by EQE Incorporated for Northeast Utilities Service Company. This study was performed to identify potential hazards to Category I components posed by Category 2 components that were not designed for seismic loads. It utilized experience data from past 7

j. earthquakes to identify and account for realistic seismic interactions.

The experiench data base indicates that the most frequent and hazardous seismic interactions are sliding equipment, falling ceiling fixtures, and piping impact, and that piping systems have a very high tolerance for seismic interactions. The Hillstone III seismic interaction study recommended criteria to be used to identify realistic piping interactions.

The study described in this report was performed to present the i quantitative data for piping that supports the application of experience i [~

J data in the Millstone III seismic interaction study. A number of comparisons between'the El Centro Steam Plant Unit 4 data base and the Millstone III Category 2 piping were developed. These comparisons were

, .. performed for the key parameters that influence the potential for and damage due to seismic interaction, including:

Ground motion response spectra 1.

2. In-structure response spectra i
3. Piping materials
4. Piping sizes

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5 *. Piping operating conditions L

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6. Piping components and construction
7. Support spacings
8. Support types and design i

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This study- demonstrates that the El Centro Plant data base generally envelopes the Millstone III Category 2 piping for these parameters.

Because the data base envelopes the Category 2 piping, it can be concluded that the use of experience data to conduct the Millstone III seismic interaction study is appropriate.

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1. INTRODUCTION A seismic interaction study of the Millstone III Nuclear Power Plant has been conducted by EQE Incorporated for Northeast Utilities Service Company (NUSCO). This study is described in detail in Reference 1. The seismic interaction study was performed to identify potential hazards to Category I components posed by Category 2 components that were not designed for seismic loads. This hazard may occur due to impact or spatial interference resulting from seismic excitation.

The seismic interaction study for Millstone III utilized experience data from past earthquakes to identify and account for realistic seismic interactions. The use of experience data to address seismic interactions is considered to be appropriate since the data base includes the effects of eight earthquakes on over 40 power generating stations, substations, and industrial facilities. These sites contain equipment similar to that found in a nuclear power plant. A review of the damage contained in the data base provides an indication of the types of credible interaction scenarios along with the level of seismic motion at the threshold of occurrence. This review can also reveal x which interactions should not receive an undue amount of attention in an I

L interaction study. The experience data base can be used to develop criteria for the resolution of potential interaction scenarios.

A survey of the experience data base in Reference 1 res ealed that the most frequent and hazardous seismic interactions are as follows:

L e Sliding equipment a Falling ceiling fixtures a Piping impact i.

A detailed review of the seismic interaction of piping at the El Centro Steam Plant was then performed. A walkdown of the plant identified 290 potential seismic interactions of piping and piping components. This number is conservative since not all piping systems were covered. Of these interactions, only one instance of 1-1

an air-operated valve impacting a steel column actually resulted in earthquake-induced damage. This was the only case of seismic interaction resulting in damage evidenced in the 40 data base facilities that were available at the time Reference I was written.

A few more interactions were produced by the recent Chile earthquake.

The experi.ence data base indicates that piping systems have a very high tolerance for seismic interaction. Reference 1 concluded the following:

1. Impact of Non-Category 1 piping on Category 1 piping should be considered a potential hazard only if specific conditions exist.
2. Failure of piping attachments due to seismic interaction is a credible hazard and should be checked.
3. The supports for the Millstone III piping will remain intact under the design basis seismic loads even if seismic loads were not considered in their design.

In addition, a recent study completed by EQE Incorporated has compiled a survey of earthquake-induced piping damage (Reference 8). A review of this damage survey shows no evidence of welded piping suffering a complete loss of structural integrity with subsequent impact on and damage to adjacent compenents. Most of the Millstone III Lategory 2 piping is of welded construction and would also be expected to perform successfully without total collapse during an eari!hquake.

The purpose of this report is'to present the quantitative data supporting the use of piping experience data to conduct the Millstone III seismic interaction study. The conclusions of Reference I will be validated by quantitatively demonstrating that the seismic input, piping', and piping support parameters of the experience data base plants envelope the corresponding parameters of the Millstone III Category 2 piping. So long as this enveloping is shown, the conclusions of the Millstone III seismic interaction study are appropriate since they were 1-2 h

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2. EL CENTR 0 STEAM PLANT UNIT 4 PIPING The piping of the El Centro Steam Plant Unit 4 was selected for (e, comparison to the Millstone III Category 2 piping for the following ional reasons: in
1. The plant was the most heavily shaken, and the most heavily damaged of the seven major power plants reviewed in detail in the Seismic Qualification Utilities Group

'the (SQUG) program.

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2. A ground motion record of about 0.5g peak horizontal more ground acceleration was taken at the site, and mc
3. A wide variety of piping configurations is present; only a few of the primary piping systems in Unit 4 were designed led for seismic loads.

Substantial amounts of documentation on the earthquake to

4. .

input and piping systems were readily available for use in this study.

2.1 General Description of Pioino The El Centro Plant Unit 4 piping ranges from essentially rigid to very flexible, depending on length of run. Piping runs were found with re.ponse frequencies as low as 1 Hz. Most piping is carbon steel, although a few stainless steel lines are associated with the water demineralization systems. The piping includes both threaded connections in the low pressure lines, such as in the component cooling or fire water systems; or a combination of welded and flanged connections in the high pressure systems such as steam or feedwater. Piping ranges in size from a large inventory of pneumatic instrument tubing (typically 1/2-inch diameter), up to 18-inch lines in the main steam system and a 30-inch abovegrade line in the circulating water system. Pipe supports are primarily rod or spring hangers. All high temperature lines are insulated, typically with a 1-1/2-inch to 3-inch layer of calcium silicate wrapped in sheet metal lagging, or an equivalent insulation.

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3. PARAMETRIC COMPARISON OF THE MILLSTONE III CATEGORY 2 PIPING To demonstrate the applicability of the experience data base on seismic interaction of piping, a series of comparisons between the Millstone III Category 2 piping and the El Centro Plant Unit 4 piping were made.

These comparisons were performed for categories of characteristics that most significantly influence the potential for and damage due to seismic interaction of piping. These categories are:

m Seismic Input a Piping Parameters a Support Parameters The seismic loads and displacements to which the Millstone III piping may be subjected by the Safe Shutdown Earthquake can be measured relative to the loads and displacements experienced by the El Centro Plant piping during the 1979 Imperial Valley Earthquake by a comparison of the seismic input. The piping and support parameters can allow comparisons of both the piping capacity, dynamic response, and potential for seismic interaction. The intent of these comparisons is to show that the El Centro Plant piping characteristics envelope the corresponding Millstone III Category 2 piping characteristics.

. 3.1 Comoarison of Seismic Inout The magnitude of the seismic loads to which piping systems may be subjected depends upon the level of seismic input. A comparison of the seismic input to which the El Centro Plant Unit 4 piping was subjected by the October 15, 1979 earthquake and the input to the Millstone III piping for the Safe Shutdown Earthquake can be performed as follows:

1. Comparison of the ground motion response spectra
2. Comparison of the in-structure response spectra
3. Comparison of potential anchor support motion as measured by interstory relative drifts 3-1

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3.1.1 Ground Motion Response Snectra In their January, 1985 report prepared for the Seismic Qualification

. Utility Group (Reference 2), the Senior Seismic Review and Advisory

. Panel (SSRAP) noted that comparisons of ground response spectra should be emphasized when comparing experience data base plants to nuclear facilities. This is because floor spectra typically were generally not available for the data base plants and realistic floor spectra are often not available in nuclear plants. Floor response spectra are usually

, very conservatively computed and tend to show much larger amplifications than actually exist. Studies conducted by the Seismic Safety Margin Research Program (References-3 and 4) demonstrated that the large s- conservatism which exists in traditionally computed floor spectra is due to the use of conservative damping levels for the structure and insufficient consideration of factors such as wave scattering and embedment. Therefore, comparison of the El Centro ground response spectra to the Millstone SSE ground response spectra gives the most realistic indication of the high margins which can be expected for the Millstone III Category 2 piping.

The Imperial Valley was extensively instrumented prior to the earthquake

! by a network of strong motion accelerographs. A 13-station linear array I

was located straddling the fault. In addition, a digital recording differential array was placed in a large vacant lot near El Centro Plant Unit 4. Station 5165 at the south end of the differential array was positioned less than one kilometer from the plant. A digitized i: corrected version of the time history from Station 5165 has been used in three separate dynamic analyses (References 5, 6, and 7) to recreate the seismic response of the Unit 4 structure. This set of time histories has been selected by these analysts as being the most appropriate for their studies.

4 The seven percent damped El Centro ground motion response spectra in the N-S, E-W, and vertical directions for the time histories recorded at Station 5165 are shown in Figures 3-1 through 3-3. Also presented in Figures 3-1 through 3-3 are the seven percent damped horizontal and 3-2 "

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Figure 3-1 Comparison of El Centro N-S Response Spectrum with Millstone III Horizontal Design Ground Response Spectrum, 7% Damping.

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Millstone III Horizontal Design Ground Response Spectrum,

. 7% Damping.

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Figure 3-3 Comparison of El Centro Vertical Response Spectrum with Millstone III Vertical Ground Response Spectrum, 7% Damping.

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l vertical ground spectra for the Safe Shutdown Earthquake (SSE) adopted l for the design of Millstone III. The N-S and-E-W ground spectra for the El Centro earthquake envelope the Millstone III horizontal design spectra at all frequencies. The margin between these spectra is as much as a factor of about three. The El Centro earthquake vertical spectrum L exceeds the Millstone III vertical design spectrum for frequencies of about 3 Hz or greater. The difference between these spectra can be greater than a factor of ten. The Millstone III vertical design spectrum slightly exceeds the El Centro earthquake vertical spectrum for

[ frequencies between about 1 Hz and 3 Hz. However, most real structures have vertical frequencies in excess of 3 Hz. This is particularly true for the reinforced concrete shear wall structures comprising the Millstone III Plant. The comparisons of ground spectra indicate that

the seismic input experienced by the El Centro Plant Unit 4 structure

! was well in excess of the ground motion to which the Millstone III structures would be subjected by the SSE. It can be concluded that the El Centro ground motion input clearly envelope the Millstone III design ground motion input.

L 3.1.2 In-Structure Resoonse Spectra Seismic interaction can occur if two adjacent components displace sufficiently to close their separation. Another measure of the potential for seismic interaction can be obtained by a comparison of the

J spectral displacements from the El Centro Plant and Millstone III in-structure response spectra. Worst case in-structure response spectra from each facility will be compared. By demonstrating that El Centro Plant piping experienced displacements much larger than those anticipated for Millstone III piping, it can be concluded that Millstone III Category 2 piping can accommodate SSE motion without causing damage to Category 1 piping or equipment due to seismic interaction.

f Reference 5 developed in-structure response spectra for the El Centro Unit 4 Steam Plant. The analytical model used to generate these spectra conservatively represented the soil-structure interaction effects by including very large soil radiation damping. High soil damping 3-6 Y

decreases dynamic amplification and results in lower in-structure response spectra than would be calculated with a best estimate approach.

Table 3-1 presents tabulated results from this study. These results were based upon in-structure spectra from the bottom story of the structure to minimize the beneficial effects of structure dynamic amplification. Because of these conservatisms, the actual displacements

, experienced by El Centro piping during the 1979 Imperial Valley j Earthquake.would be expected to be higher than those shown in Table 3-1.

Also shown in Table 3-1 are worst case results for three Millstone III structures; the auxiliary building, control building, and reactor

internal structure. These particular structures were chosen based upon an envelope of in-structure response spectra for all structures containing Category 2 piping. Spectral displacements were determined from in-structure response spectra developed for the top floor of each structure. Since the majority of Millstone III Category 2 piping is located at lower elevations in these structures, the tabulated results

' represent an upper bound on expected SSE seismic motion.

Typical El Centro Plant piping is quite flexible, with a significant portion of the piping systems having fundamental frequencies as low as 1

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Hz (Reference 1). El Centro Plant piping with fundamental frequencies in the 1 to 4 Hz range accommodated spectral displacements from 5.3 to 1.1 inches. At higher frequencies, spectral displacements were lower, ranging from 0.2 inches at 8 Hz to 0.01 inches at 33 Hz.

f Frequencies for Millstone III Category 2 piping were estimated using simple hand calculations for typical piping sizes and support spacings specified in the design criteria. Based on these results, Millstone III piping is estimated to have lower bound fundamental frequencies ranging from 2.5 Hz in the horizontal direction to 10 Hz in the vertical direction. For the worst case, Millstone III SSE spectral displacements

, are on the order of 2.3 inches. This is a factor of 2 less than the spectral displacements accommodated by El Centro Plant piping without damaging seismic interactions. More typical piping runs with closer support spacings would have even higher frequencies, and experience even 3-7

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Comparison of El Centro versus Millstone Spectral Displacements Spectral Displacement (inches)

. Facility 1Hz. 2Hz. 4Hz. 8Hz. 10Hz. 33Hz.

El Centro Unit 4 5.3 3.1 1.1 0.17 0.07 0.005 j Steam Plant l

M3 Control Building 3.4 1.5 0.58 0.44 0.13 0.005 l

M3 Auxiliary Building 3.4 1.8 0.52 0.58 0.24 0.005 1

M3 Reactor Internal 3.4 2.0 2.3 0.20 0.17 0.007 Structure

1. All results are for maximum horizontal response 4% critical damping

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smaller displacements. Better performance would be expected for these lines. This comparison clearly demonstrates that Millstone III Category

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2 piping can accommodate SSE dynamic response without damaging interactions.

3.1.3 Seismic Anchor Movement t' During the 1979 Imperial Valley Earthquake, piping systems located in

'- the boiler'str.ucture and heater building of the El Centro Unit 4 Steam Plant (Figure 3-4) were subjected to significant anchor support motion.

Post-earthquake walkdowns of the facility by plant personnel did not demonstrate any evidence of piping system collapse or seismic interaction as a result a .nchor motion. This can probably be attributed to the fact that piping systems are very ductile and have an inherent capability to accommodate large relative displacements through system flexibility and local load redistribution. By demonstrating that anchor support displacements experienced by El Centro Plant piping

b. systems meet or exceed maximum expected movement at Millstone III for

. SSE g.round motion, it can be concluded that Millstone III Category 2 piping can accommodate SSE displacements without collapse or damaging seismic interaction, i

i~ One measure of potential anchor support motion can be achieved by converting structural displacements between adjacent floors to interstory relative drifts measured in in/ft of structure height. This is a convenient way of comparing results between structures having

[ dissimilar story heights. In addition, since piping anchor points are not known, it provides a reasonabic method for comparing the magnitude of potential anchor support displacements.

, Analytical studies presented in References 5, 6, and 7 tabulated maximum b story displacements for the El Centro Unit 4 boiler structure and heater building. These displacements were used to calculate interstory relative drifts in order to assess the anchor support movements experienced by El Centro Plant piping systems. Results are tabulated below along with the corresponding results for Millstone III. Millstone III results are very conservatively based 'tpon worst case interstory 3-9

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relative drifts calculated for all structures having potential seismic interactions between Category 1 and Category 2 piping.

Interstory Relative Drift Comparisons L-El Centro Millstone Range of Predicted 0.003-0.06 in/ft 0.002-0.003 in/ft Displacements f As shown by these results, El Centro Plant piping experienced anchor motions up to 20 times as large as the largest expected anchor motion for Millstone III. Even in the worst case, the smallest predicted interstory relative drift for the El Centro Plant was as large as the peak expected relative interstory drift at Millstone III. Because of the excellent performance of the many El Centro Plant piping systems, it

,. is evident that piping collapse or seismic interaction resulting from h., anchor support motion is not a credible failure mode.

'- 3.2 Comparison of Pioino Parameters It is possible to identify a number of parameters that influence the capacity, response, and potential for seismic interaction of piping systems. The most important parameters include the following:

. 1. Material

j. 2. Size
3. Operating Conditions
4. Components and Construction e

1 3-11 l-

. . 1 j Comparisons between the El Centro Plant and Millstone III Category 2 piping were performed for each of these parameters. These comparisons were based upon data contained in the piping specifications and pipe line lists available for these plants. A copy of t'he El Centro Plant r: pipe line list is contained in Appendix A.

3.2.1 Comparison of Pipino Materials Figure 3-5 displays the different types of piping materials and the number of lines constructed of these materials found at the El Centro

Plant. The materials are identified by their ASTM specification number.

As shown in Figure 3-5, most of the piping lines consist of A-53, Grade B carbon steel. Other types of carbon steel as well as stainless and chrome-moly steel are also included in the El Centro Plant data base.

!? Although there are not large quantities of some of these materials, I

their mechanical properties (strength, modulus of elasticity, ultimate strain, etc.) are not significantly different from the properties of

.I. materials found in greater abundance.

The Millstone III Category 2 piping systems of interest are constructed of the following materials:

q-j, 1. A-106, Grade B carbon steel

2. A-312, Type 304 stainless steel i.
3. A-312, Type 304L stainless steel d'
4. A-358, Type 304L, Class 1 stainless steel
5. A-376, Type 304 stainless steel

? 6. A-376, Type 304L stainless steel

7. A-335, Grade P22 chrome-moly steel

'- 8. Fiberglass reinforced plastic pipe 6-i_.

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4 Number of Lines vs. Material Specifications ,

200 166 g 150 -

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Z 50-27 2 0 N , , , k\,NN 3 8 8 N a a a a n a 8 8 E O E E D 2 9 Q ASTM Specification Figure 3-5 El Centro Plant Piping Material Specifications

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Materials 1, 2, and 7 listed above are represented by the El Centro

- Plant data base. Only a few piping systems are constructed of Materials

~

4 and 8. Furthennore, they are not represented in the El Centro data and should be treated on a case by case basis at Millstone III.

3 Materials 3, 5, and 6 are not used at the El Centro Plant. However, their mechanical properties are very similar to A-312, Type 304 stainless steel which is included in the El Centro Plant data base.

,f This comparison shows that the El Centro Plant piping materials essentially encompasses the Millstone III Category 2 piping materials.

3.2.2 Comoarison of Pioina Sizes Figure 3-6 presents the total number of lines constructed of the various pipe diameters contained in the El Centro Plant data base. Pipe diameters range from 0.5 inches to 30 inches. Pipe diameters of 10 inches and less are represented in significant numbers. Figures 3-7 to 3-14 show the number of lines constructed of these pipe diameters for each of the different pipe schedules contained in the El Centro Plant data base. Piping is found in nearly all schedules ranging from

Schedule 10 to Schedule 160. Most of the data consists of Schedules 40 and 80 pipe.

The Millstone III Category 2 piping that has the potential for seismic 3

interaction with Category 1 piping or equipment is 12 inches in diameter

! or less. The piping schedules vary from Schedule 10S to Schedule 80.

, In contrast, the El Centro Plant data base piping has diameters up to 20

! and 30 inches and wall thicknesses ranging from Schedule 10 to Schedule 160. This comparison clearly indicates that the data base pipe sizes envelope the Millstone III Category 2. piping.

. 3.2.3 Comparison of Pipino 00eratina Conditions i

The operating pressures and temperatures of the El Centro Plant piping were compiled from the pipe line lists. Figure 3-15 illustrates the range of operating pressures for each of the pipe diameters used at the El Centro Plant. This figure contains the number of lines having operating pressures occurring in prescribed ranges. These ranges i

3-14

,_ , 7 . c, n. ,7 rg . - _ _ _ _ ___ . .. .

g. _ . _ .

Number of Lines vs Pipe Diameter (All Schedules) 1 0 0 ,-- ---- - --

3 -- tander of pipes 80 J

- Range of El Centro data

]

60 ,

o 53 N N

y , T ,52 o

a 40 ,

N k k N 3' kN -

E N N 9 N 3, 20 - N kN N kN kN NN kN s 22

,2 N N N N N N N N N N N N

.c 0: sth(shhakh(N= s (sh a, , ,

i i i ii i i i i i i i i, i i i QRQ~Q"Q"

~ * "

      • 3 $ @ @

T T

N Pipe Diameter Figure 3-6 El Centro Plant Piping Sizes, All Schedules

. . .7 .

4 s

Number of Lines vs Pipe Diameter (Schedule 10) 50 3 - Mnber of pipes 4 4 40-

- Range of El U3 Centro data O

  • C

.J 30-Y O E e'

-Q 20 -

E i a
z j 10-i 0 0 0 0 0 0 0 0 1

I g i e i i i i i e 0

i 0

i 0

i 0

i 0

i h. 0 0

0 0

N O " N N N M + @ m O N t e c0 O O

) )i )I " " " " " N n

- .m Pipe Diameter -

Figure 3-7 El Centro Plant Piping Sizes, Schedule 10

v.-. . - . = .

7 .

Number of Lines vs Pipe Diameter (Schedule 20) 50 1

1 3 - Nnber of pipes 40

- Range of El y) Centro data e

.E

> 30 -

w  %

i

' o

" t t O

O 20 4 E

a i Z 10 i

U 0 0 U 0 0 0 O . . . . . . . . . . ". . . . . . . .

N m + - N N N m + e o o N + e r o o x

- x,n x n

x x

- - - - - N n

! l l

- N J

Pipe Diameter Figure 3-8 El Centro Plant Piping Sizes, Schedule 20 l

4 d

Number of Lines vs Pipe Diameter (Schedule 30) 50 3 - finber of pipes

! 40 -

_ - Range of El l Centro data

.E >

J 30-ca O I

i m

L.

c)

O E 20 1-a Z

10-- a 0

0 0 *

  • O O O O O i i i i i i e i . . i i i i i i i N m + - N N N n + e m o N + e m o o x xc x n x x - - - - - N .n

, I l

- N 2

Pipe Diameter Figure 3-9 El Centro Plant Piping Sizes, Schedule 30 1

y . . ..

r _- ___ _

Number of Lines vs Pipe Diameter (Standard Weight) so 3 - Mnber of pipes

, 40 -

.__ - Range of El y) Centro data ID C

'.~1 30 w O b

i D 20-E a

Z '

10--

2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 . . . . . . . . . . . . M. M. M. M. M. .

N ED t e N N N n t to 80 0 N t c c0 0 0 N- N N N N -- e e e e N n o n - -

1 I e N Pipe Diameter Figure 3-10 El Centro Plant Piping Sizes, Standard Weights

7 7-- . . ._ .- -> . _ .

7 Number of Lines vs Pipe Diameter (Schedule 40)

So g 9

gq a T g 3 . _ . . .

4o k k k - g, =

8 kN k N =

kN 3 30- k k 9 k ="

A E k k k k k a k k k k ER k e 1- k k h k khk

\ 4 4 \ 4 N k h N 4*

N %

to- a

\ % \ N 5 kkkk kkkk5 o . b. ....b......o .

o o

o o

o N

.'- 4 Pipe Diameter ,

Figure 3-11 El Centro Plant Piping Sizes, Schedule 40

Number of Lines vs Pipe Diameter (Schedule 80) 50 3 - tanber of pipes 40-

- Rarge of El m Centro data O

.E J 30-

'f O N L.

O

-Q 20 -

l E a

Z 11

10-6 6 gN -

0 O , O 0 0 0 0 0 0 0 0 0 0 . . . . . . . . M. . . . . . . . . .

y$f~f"y****9 "

  • 2 2 nn I I

- a Pipe Diameter Figure 3-12 El Centro Plant Piping Sizes, Schedule 80

7 __

~ __ ._ _

. 7 f

Number of Lines vs Pipe Diameter (Schedule 120) 50 3 - Msvter of pipes 40 -

_ - Range of El

(/) Centro data e

C

  • O 30_

Y M e

.o 20-E a

Z 10-4 0

0 i

0 0

i 0

i 0

i 0

i 0

i 0

i OM i i i O

i O

i O

i O

i O

i O

i O

i l

N 00 t - N N N M t C 40 0 N

  • W C0 O O x- xe x n x x - - - - - N n 1 I e N Pipe Diameter Figure 3-13 El Centro Plant Piping Sizes, Schedule 120

._7 i

}

i Number of Lines vs Pipe Diameter -

l (Schedule 160) 50 l

3 - Mnber of pipes 40 - - Range of El j g Centro data G)

C

'] 30-l Y o

{ U u O

D 20-

' E a

Z +My l 10-2 0

0 0

0 0

[ M, 0 [ O O

, M, O M0 i i ,

0 i

0 i

0 i

0 i

i N e v - N N N O + @ e O N + @ m O O

! N- N N N N - - - - - N O i

to 6 - -

. l l

=, - N Pipe Diameter j

Figure 3-14 El Centro Plant Piping Sizes, Schedule 160

e. c r-  :- --
m-: --

z  : -, .T.

_ 7. .

Number of Lines in Pressure Range (All Schedules) .

2201-Up 1 1 -

  • ~

O 2001-2200 _._ _

U 1801-2000 1 '2 1 2 _ - Range of El d - Centro data 1601-1800 1 2 0 1401-1600 1 1 1 O

C 1201-1400 1 1 1

" 0 -

4 g 1001-1200 -

801-1000 1 1

' 601-800 1 1 2 1 1 J _

W 401-600 1 M -

0 201-400 4 1 1 2 2 2 L _ _

Q_ 101-200 4 10 3 2 3 2 2 1 1 100 12 2 45 34 34 52 3 20 21 26 24 1 4 2 2 1 1 I I I I I I I I i I i I I I i i i l qR(

- e n

~

q~qn * * = ec e=aa e N Pipe Diameter, Inches Figure 3-15 El Centro Plant Pipe Operating Pressures, All Schedules

f encompass pressures from -6 psi to over 2400 psi. Most of the systems have operating pressures less than 400 psi. Figures 3-16 to 3-23 show the same information for each of the pipe schedules. Pipe Schedules 10 to 40 are used primarily for the lower operating pressures (400 psi or less). Schedule 80 pipe is used for operating pressures from 400 psi to 1000 psi. Schedules 120 and 160 pipe are mostly used for operating pressures in excess of 1200 psi.

Figure 3 54' presents the range of operating temperatures for each of the pipe diameters used at the El Centro Plant. This figure shows the number of lines with operating temperatures within prescribed 1000F intervals. Operating temperatures as high as 10050 F occur. Most of the piping systems have operating temperatures less than 4000F. Similar t plots for each of the different pipe schedules are shown in Figures 3-25 to 3-32.

r- Design pressures and temperatures for the Millstone III Category 2 piping are available from the piping specifications. The maximum design pressure and temperature for any Category 2 line are 1380 psi and u 10500 F, respectively. These values compare with the El Centro Plant data base maximum operating pressure and temperature of 2400 psi and 10050 F. This comparison shows that the data base adequately bounds the Millstone III Category 2 piping.

g. 3.2.4 Comparison of Pioino Comoonents and Construction Components that are integral with the piping systems include attachments and fittings. The potential for seismic interaction of attachments such as valves and thermocouples with adjacent structures or piping has already been addressed by the review criteria recommendations of Reference 1. The Category 2 attachments (valves, couplings, etc.) and fittings (tees, branches, elbows, etc) used at Millstone III are similar to or the same as other components used throughout the utility industry.

, The performance of these components would be expected to be no worse i than the performance exhibited by the seismic experience data base as a whole. -

f. -

3-25 i

7 7 _. ~,. _ .. _ . ._ ,

Number of Lines in Pressure Range (Schedule 10) 2201-Up -

. O 2001-2200 M 1801-2000 ___ - Range of El b - Centro data 1601-1800

@ 1401-1600 -

C 1201-1400 0 -

, g 1001-1200 -

M g 801-1000

' 601-800 3 -

W 401-600 W -

0 201-400 L -

Q_ 101-200 100 1 1 I I I I I I I I I i i i i I I i l i eq( -

q~q"+==ae e=ag

- e , -

7e N Pipe Diameter, Inches Figure 3-16 El Centro Plant Pipe Operating Pressures, Schedule 10

._ ~.

7 - _ ,

7 .._g _

Number of Lines in . Pressure Range (Schedule 20) 2201 - Up -

8 - " ' ' **

CD 2001-2200 1801-2000 __ - Range of El b - Centro data 1601-1800 0 1401-1600 O's -

C 1201-1400 0 -

y 1001-1200 w t

! 4 w O, 801-1000 !

I

' q 601-800 ,

] ,

O 401-600 i O j O 201-400 i O._ 101-200 100 1 l 1 I i I i i i i l i I I I I I i 1 .

RRR~R"R"

- e n

  • ==ec: = = ag 7

7 N

Pipe Diameter, Inches Figure 3-17 El Centro Plant Pipe Operating Pressures, Schedule 20

, y ,. 7 .y__ .- g , _

, m . - .

~

Number of Lines in Pressure Range (Schedule 30) ~

2201-Up O 2001-2200 3 - Ptater of pipes 1901-2000

_ - Rang. cv En 1601-1800

. 4 E,"' "

1401-1600 D -

C 1201-1400 o "

, y 1001-1200 l

. -t g g 801-1000,{

601-800 69 401-600 (A -

OJ 201-400 Q_ 101-200 r

I 100 8 1g 1 1 1 I I i I I i I i I I I I I I I I I eR(

~ *"

ea e"~==ec: =- =

aa T T e N i

Pipe Diameter, Inches Figure 3-18 El Centro Plant Pipe' Operating Pressures, Schedule 30

Number of Lines in Pressure Range (Standard Weight) _ _ __.

2201 -Up _

Q 2001-2200 3 -* ' P iP**

  • 3 1801-2000 _

_ aang. og el Centro data 1601-1800 0 1401-1600 0 -1 j Z 1201-1400 ;

l w

. - 1001-1200]

U 801-1000 ]

O q 601-800 l 3 -4 LO m

401-600 l f y ,

O 201-400 1j u _ m O_ 101-200 q - -

m 100 1 1 1j 2l I I i I I i I i i I i i i i i i i I e=q q~q"* = = eez==ag

- o n - -

- N Pipe Diameter, Inches Figure 3-19 El Contro Plant Pipe Operating Pressures, Standard Weight

..2 .

Number of Lines in Pressure Range (Schedule 40) 2201-U;:  ! _

Q 2001-2200 3 - **r of pipes J

ISC'~2000 { _ - Range of El d I

' Centro data

? U;! - 1800 l

r. ~1
  • 1401-1600 :

A C 201-I400 ,

G ,  !

y 1001-1200 ml l f

u 4, 1, 501--1000 i o

601-800_j! I J  ;

01 "

401-600 l l 7 O 201-400 3 11 1 2 2 2 L M i Q_ 101-200 l  !

4 i

10 3 1 3' 2 2 i

100 9 33 28 46; 3 20 21 26 2l {4 16l I i i I 6 I i i I i I I I I I I i I qeq~q~q"

-e , - -

~ =

.=ee2 eeaa 1 4 Pipe Diameter, Inches Figure 3-20 El Centro Plant Pipe Operating Pressures, Schedule 40

s e

p I ov 2

e ip l

  • 0 g f o E#

f o

4 om 8 n ~ r a e g e a .

t n

n R

n a

i e- l u

R - - I e-d e

h

- e 3 y- s c S

e a

r u a- h s s I c e r

s o- n u e) r0 I

I s s

.- e P8 I e

r P

r e  !

e e g nl u t n i

d e i t

- 1

- i

  • s e m a r

.. ech 1 1

. 1 q e a e p

nS i O

i(

L I

aN Im D e p

f 2 1 I

1 6 I m e i P

o p t i

. 6 mN 1e n P

4 a

. r l e

. .l '

... 1 1 1 1 1 1 &

- P b *!

o r

l' 1 1 1N I nNqe t m '

n e

.- u l oNn i C

. N 1ti l

~3 i mx- E -

... _ ,**'.f li'ii 1 l!] I gj ,!dl

- . Jl4 -

2

. 0 0 0 3 0 0 0 O 0 0 0 0 -

.. 0 0 0 0 0 0 C C 0 0 0 0 3 p 2 0 s 6 4 2 C S 6 4 2 1 u 2 2  ! 1 1 1 1

- - - - - e

- - - - - - - - 1 1 1 1 6 r

. 1 l 0'

1 1 0 0 0 0 0 1 1 1 0 0 0 0 - u

. 0 C 4 2 C 5 E 4 2 1 g 2 C 8 6 i

. 2 2 1 1  ? 1 1

F

@ 'Q vCOg Ct>72MOuO _

. uO~

- =- -. , - . -. .. . - , . .. -.

Number of Lines in Pressure Rarige (Schedule 120) 2201 -Up l -

-i 3 - * * ' ' *

, G 2001-2200 l - - -

J i8G1-2000 1 2' _

- Range of E Centro data 1601 -18CC 2 1 1*01-1600 v$

Z 1201 - 14CC g J w

cr-1001-1200 r"o ,. '02 -! COO w -

'r- 601- SOO J .,

'Il act-600 G~s -.

'l) 201-400 l

C. 101--200 +

~.

100 g T 7 T-!~ i i i i i i T~ T T ~ ~T I I i N e <t -

N N N e e e e c- N -r to e o o N N N N N e- .~ ~ e- N O

- :n n - -

1 I

- N Pipe Diameter, Inches Figure 3-22 El Centro Plant Pipe Operating Pressures, Schedule 120

s e

p I

o.

e ip l *

  • 0 g f o E*

f . om 6 1

o n r e e'

~

e a t a

n R

g n'

a T o.

l u

R r o-d e

h e 3 _

v- s c r e S u _.

a- h s s 1

- c e s .

n r u

e) _o-7 s

r0 _

s e

._ P 6 1

- qe r

~ 1

_ r P e

nl e o

< g t

n i

d u e i t

_e se -

m a r

eh c 1

- 7o a e p

nS i D O

. i(

L 7 m3 A e p

s. f - 1 1

_ , N e i P

o p

- i t

_1 ,

N3 ' . P n r a l

e , - P

. b o

, v3 r m t n

. u p e3 C e

N -

l y

Ns , E

f]. - _ qj l;1 1; !J! a l4' 3

2

- 0 0 0 0 0 0 0 0 0 0 0 0 -

. 0 0 0 0 0 0 0 0 0 0 0 0 3 o 2 0 8 6 4 2 0 8 6 4 2 1 U 2 2 1 1 1 1 1

- - e

- - - - - - - - 1 1 1 1 6 r 1 i 1 1 1 1 1 0 0 0 0 - u 0 O 0 0 0f 4 0

2 0 008 6 4 2 1 g

2 L 8 2 2 ' 1 1 1 1 i a

F C T.'t Q dy

,' r C 0 g g %e.Cwl C

  • f

~

h

.,.1 s .

. g-u -

_-- s

_ w r__ .~ .

.2, 4

i 4

Number of Lines in TemPeroture Ronae s (All Schedules) ,

I i

$ 00 -1100 it 1- 1

~ - i -

e 3 - Martner of pipes 1'!

] 90 -1000 '

l' - 4, I . _  !

3 C SC' 300

~~ t

' I !

i

- - W of El Centro data i

7 j l ,

. . i h Gi-eOC 2 I i 3. -

,1 I

,1, - -

601 Ce 1. 2 3 i !

2 i t J

_6. I j P. 50 -600 ,  ! 2 6- 2,g 1 1, I i w

j

= . i . i C JC'- 5C C 21 2 T'

j  % l ; 1  !  ;

! C i  ! -i  ! [  ;

- 2CI- CC l1' 4 ! 2! 6 5l 2; 1 1 , ;  ;

C - l  !  !  !

I r---

i C--

20 - .500 l4- .

91 7i 15 l7 2j'3l.3 .2i1,11 .II; i

I p3 {m 6 .

. , i l

7 '. 6 ' 15  :

9 2 51 i

.Ts

'r-2C0

1. 1.15 7, 2l i i i

. i i l 0-10C 19. . I 25 20' 2q 14 17 18j 7 j2l 1 j- 11 f2l 1l 10l l l '" I e I I I I i i i i I I 1 i i l' I

N CO v N N N M V (O CO C N 4 C 00 C ,C s

- s,. s, s-s

- - - - - N

} l I i

- N E

l Pipe Diameter, Inches 4

i 4

Figure 3-24 El Centro Plant Pipe Operating Temperatures, All Schedules

.,..-s, --n s

.- u~ .-

-. .. n - , , -. . . . >

4 r

. - ~ .

?

tr i

Num' oer of Lines in Temperature Range l (Schedule 10) i i i 100'-1100 ' -

i .- 7 3 - Msitzer of pipes .

! 90 -1000 i  ;

. 4 i o i - Range of El 10 -900 v,. centro data I C 701-800  :

0 -

'l 601-700  !

i -

u' a

+

T 501-600 u

e g

"$ 40'-500 ,

o 1

301-400 l C -

O- 201-300 ,

6 10 -200 ,

__ m r 0-100 ,

1l

_....,__7 , , , , _ , , , r_ 7_ r . , ,_., .

1 W m e -

m m m n t to e o a v e o o o N N N N N - - - - e N 9

- c n - -

1 1

' e m Pipe Diameter, inches i

J Figure 3-25 El Centro Plant Pipe Operating Temperatures, Schedule 10 4

)

Number of Lines in Temperature Range (Schedule 20) i

00'-1100 -

j

, 3 - tinber of pipes i 14C;-1000 I i

- Range of El a-

, , . .ggg

~

Centro data y* - i c i . .gnc (

t ._

.? -

o0 - - .a .  :

i u' 'ic. ' - 6 0 r  :

^

f . 10 ' -- b G C a c .

b _' c : -- ac c h-t.

2 t" .500 ,

3 j

{~ 101-200 i  !

_.- --i ,

l 4 i 0--100 l1

_-...r.- r -- r - i T-- i c i i i i r- La; r -

u -- i m o e -

N o. a n y e o m r e au o ,a s scs n s s o.- - .- - - ~

- - e t 1

- N Pipe Diameter, Inches Figure 3-26 El Centro Plant Pipe Operating Temperatures, Schedule 20

1

2. -_ __. . _ . _ . . _ . .. _. ._ . _ , ._.

i j .

i

)

i Number of Lines in Temperature Range I (Schedule 30) ,

- - --- . . . . . - . t i

1001-1100 1 - .

j al_ 1 1 ur ' ~

' ' 'iP**

, -- 1000 ,

j d.' S01-900 ! - Range of El [

U, g Contro data j -- o1..g00 >

i O E c 01 - 700 -

4 J

t Id 501-600  !

t  !  :

i ,

, H w 401-500 I

J.

l 0 -

L 301-400 I U -1

! & 201-300 i F j di 101-200 1 p__

j q

l 0-100 7 1 1 i

1l l I ~ - ~I- I' i 7 l 1 I i i T-T~i I i I i 1 --  !

m e 9 -

m a m- n y e o a e e o o N- N N N N o.-- - .- - o.- N V)

\ nn n e e I

I i j - m l

i Pipe Diameter, Inches

! t 1

Figure 3-27 El Centro Plant Pipe Operating Temperatures, Schedule 30 l 1 t~

.( .-

. . . ..;., . . y; _

i f

Number of Lines in Temperature Range (Standard Weight) . . - . .

1001-1100 ; _

L_ J

  • 3 - r of pipes l 901.1000 l
  • 1 I O 80;-900 * - Range of El Centro data CD ..

l C 701-800 0 _

1 601-700 1 0'

501 600 b

w 401-500 d

L u 1 O

8' ,

L. 301-400 i O i CL 201--300  ! 1 1 1

p _ L_ . -
[3 101-200 . 1 p._ -4 0-100
g. g -- T-- 1 1 T 1 ~~ T I i - T' ' - T ' T i 17 i i eee.

- o n q~q"

  • * = ea eeaa 1 1

- N Pipe Diameter, Inches Figure 3-28 El Centro Plant Pipe Operating Temperatures, Standard --2ight

r 7 .

; ., m _. __._ ....

. . 7 _.

_7 4

Number of Lines in Temperature Range (Schedule 40) 1001-1100 h_

901-1000 1 1 3 - h r *' PIP **

O '801-900 - Range of El IJ) _ _ Centro data C 701-800 2 0

1 601-700 3

,C 501-600 2 1 1 m 4 H -

4, e

d 401-500 2 1 0 - - --

L 301-400 1 3 2 6 5 2 1 0 -

Q- 201-300 3 7 7 11 5 2 2 1 2 7 - - _ _

@ 101-200 3 1 15 7 2 7 2 5 6 6 4 s -

0-100 6 1 31 23 20 22 1 10 14 17 11 l6 T i , , , , i i i i i i ,- - r t i e i R=(

- o n q~qn * * =

ec: eeaa ,

3 e N 3

Pipe Diameter, Inches Figure 3-29 El Centro Plant Pipe Operating Temperatures, Schedule 40

g ,.-. - .

l Number of Lines in Temperature Range t

(Schedule 80) i 1001-1100 l -

g J

. i 3 - unter of pipes 901-1000 q[

- Centro

"*"**data

' i R

  • O1 - 90^V m

Q* y C 701--800  ;

O J I

1. 601-700 . 1 2 1

l l j

0 501--600 6 1

) Y Z m  ;

- l j g 3 401-500 l l

< C -l <

! L- 301-400 l 1

?

D 1 201-300 l 1 2 3 2

' i F-

~

, @ 101-200 , l 2 1 g _ _

i 0-100 3 ji 2 3 i, i i i ri i i i i i i i i i i qe(

q~qn * ==ec s=aa  ;

7 T

N d

k Pipe Diameter, Inches .

a Figure 3-30 El Centro Plant Pipe Operating Temperatures, Schedule 80

~. . .. _ _ . . . .s .- .- _ .a _ __ ._ .. . ..

Number of Lines in Temperature Range (Schedule 120) __

1001-1100  !

F ~

3 - firrder of pipes .

901-1000 i d - Range of El 801-900 I centro data Q 4 e

l C 701-800 !  !

O J l 1 601-700 f l 501-600 m 1 -

Z. 401-500 ,

1

~

O 1 L- 301-400 1 CD -

'1-201-300 1 2

C 1 --

fg 101-200 j H l 0-100 I I I i i i i i i I i i I i I i i .

RR(

- o n

~

q"qn *==ea: e=aa 7 7

- N Pipe Diameter, Inches Figure 3-31 El Centro Plant Pipe Operating Temperatures, Schedule 120

1 f4 g ,

- Of a c m2 e d

O g4 - 02

. 6 o e E

f

- 8t O ' '

- 9L $U L

I. ] "

~ "L

@ U a D ~

O _ 7g I E u _I o u o C

s o

a_ o m - ot __ a a

e 6.

Ee g&

-i -8 L 1

g O e W o -9 u E~

3 !_ 3 0 m C

~!

.C

- OV

-t

[a m t l-l -c O r

g .-

i 0v - g[t-t O @

.C e

,[ _j l" ~

l -2 U Q.

y

^

Q.

- -l - zyt-t 0 1 $a

-t y

1. .L i - t[E O D

-t' k

i- C L

- 9/s $e 3 - Z/ t i-Z ~

N l l l 1 1 ~ l l I i 1 O O O O O O O O O O O N

'- O O O O O O O O O O O M O 01 CO N- D D 4 A N - l

- ~

l i 1  ! I t i l i M O O O O O O O g g g O - D e O, e ~ -

u g

'a S uo;g ea rq 0Ja d u)41 A E I

3-42 w- _ . _ _ ___

i Most of the Category 2 piping systems that can potentially interact with Category 1 components or piping at Millstone III are butt or socket welded. The El Centro Plant piping as well as the experience data base as a whole contains examples of welded, flanged, and threaded r construction. The Millstone III Category 2 piping construction is adequately represented by the experience data base.

I 3.3 Comparison of Support Parameters The following support parameters are identified as being the most

{ important for definition of the capacity, response, and potential for seismic interaction of piping systems:

1. Support Spacing
2. Support Type and Design l

Comparisons for these parameters between the El Centro Plant data base and the Millstone III Category 2 piping were performed. These comparisons were based upon available piping isometric drawings, support specifications, and support detail drawings.

3.3.1 Sucoort Soacina Different support spacing criteria were used for the Millstone III Category 2 small bore and large bore piping. Piping with diameters of two inches or less were considered small bore while piping with f diameters of 2.5 inches or greater were considered large bore. For small bore nonannulus piping, vertical supports are required within the maximum span lengths shown in either Tables 3-2 or 3-3. These maximum i- span lengths are measured along the length of the pipe. The span lengths shown in Table 3-3 must be reduced by a factor of 0.75 if the pipe undergoes a horizontal change in direction. Vertical supports are also required at each concentrated load such as valves, traps, strainers, and risers. To control pipe sway, lateral restraints for small bore piping are required at approximately 30 foot intervals.

+--

0 3-43

~ . .

. ._.. . . . _- _. 't . . _ ._ _ . . . _... ._ .. .. .

Table 3-2 3

Maximum Spans for Millstone III Category 2 Small-Bore, Carbon / Stainless Steel Piping Pipe Pipe and Liquid Pipe and Pipe and Air / Steam Pipe Size and Insulation Licuid and Insulation- Only 2" 10'-0" 10'-0" 13'-0" 13'-0" 1 1/2" 9'-0" 9'-6" 12'-0" 12'-0" 1" 7'-0" 7'-6" 98-0" 9'-0" 1

t,a 1

a 3/4" 6'-0" 6'-6" 8'-0" 8'-0" 1/2" 5'-6" 6'-0" 3/8" 5'-6" 6'-0"

_ __r, 7.~

Table 3-3 Alternate Maximum Spans for Millstone III Category 2 Small Bore Carbon / Stainless Steel Piping Pipe and Pipe and .

Pipe Liquid Pipe and Air / Steam -

Size Insulation Licuid and Insulation Pipe Only Sch 40 Sch 80 Sch 40 Sch 80 Sch 40 Sch 80 Sch 40 Sch 80 2" 11'-0" 12'-0" 13'-0" 13'-0" 13'-0" 13'-0" 14'-0" 14'-0" 1 1/2" 10'-0" 10'-0" 12'-0" 12'-0" 11'-0" 11'-0" 13'-0" 14'-0" w 1" 7'-0" 8'-0" 9'-0" 9'-6" 8'-0" 8'-0" 10'-0" 10'-0" 3/4" 5'-0" 6'-0" 6'-0" 7'-6" 5'-6" 6'-0" 7'-0" 8'-0" e

g

,? *

  • Vertical pipe supports for the Millstone III Category 2 large bore piping are required within the maximum span lengths prescribed in the ANSI /ASME B31.1 Code that are shown in Table 3-4. These span lengths are measured along the length of the pipe and were typically reduced in

' F the design process by a factor of approximately 0.75 for piping with horizontal changes in direction. Vertical supports are also provided at p risers longer than half of a maximum span length and other concentrated

! loads. Horizontal supports are typically provided at every second or third vertical support.

I Support spacings for the El Centro Plant data base were obtained from the piping isometric drawings. Only data for piping with diameters of 1 i- inch or greater were compiled. Figures 3-33 and 3-34 show the number of

} occurrences of different vertical and horizontal support spacings for l4 the El Centro Plant lines containing liquid. These spacings are measured along the length of the pipe and are provided for each pipe diameter. Figures 3-35 and 3-36 show the same information for piping

)_ r containing vapor.

The maximum support spacings permitted for the Millstone III Category 2 piping are also noted in Figures 3-33 to 3-36. This comparison clearly indicates that the Millstone III vertical and horizontal support

~

4 spacings are enveloped by the El Centro Plant data base. There are

! several cases where the El Centro Plant support spacings greatly exceed those permitted at Millstone III. This observation indicates that the El Centro Plant _ piping has a much greater range of flexibility than the Millstone III Category 2 piping. Piping flexibility is a direct measure of the potential for occurrence of and damage due to seismic l't . interaction. Highly flexible _ piping will undergo greater displacement during an earthquake. It can be concluded that the El Centro Plant data base piping is more vulnerable to damage due to seismic interaction than the Millstone III Category 2 piping.

O f

9

. 3-46

T

,-- g m- --

_;, ~

1 1

Table 3-4 Maximum Spans for Millstone III Large Bore Piping from ANSI /ASME B31.1 Nominal Water Steam, Gas Pipe Service or Air Service (ini (feet) (feet) 3 12 15 4 14 17 i 6 17 21 l

8 19 24 ,

w 12 23 30 E

N 16 27 35 20 30 39 24 32 42 I

.c , ,  ; _., _ _ . . < . . _. _.

7.. . 3 . . ,

Pipe Support Spacing vs. Pipe Diameter

< (Liquid Horizontal Spacing)

Td Over 60 5 2 5 1 1 3 8 1 0 >

  • 3 - " ' ' pip **

51 - 6 0 1 3 3 2 4 O 3 4 3 2 3 - Range of El 41 - 50 1 1 1 Centro data 0 36-40 ; 4 2 2 1 2 l1

> > - Millstone 111 g q .

rraximm support

> l a 31 - 35 2 3 1 6 1

! spacing m -

3 2

5 2 2 4 26-30 1 i u -

g O 21 - 25 3 6 3 2 6 3 1

]

16-20 7 6 6 1 4 2 l 1 i 3 11-15 2 3 10 3 1 2 2 1 m

6-10 20 4 13 1 10 1 4 4 1 . 1 1 0 -

_ ._ L_

.b 0-5 20 10 9 6 1 5 5 1 a- i i i i i i i i i i i , i i i , i i e=(

- e n

~

q~q" < = = ec eeaa

- N Pipe Diameter, Inches Figure 3-33 El Centro Plant Pipe Horizontal Support Spacing, Liquid Filled D Pipes, All Schedules

n . _ _ . . . . . _... . __ . _ _ . _ . _.

. s . . -e 4 $ i i a i Pipe Support Spacing vs. Pipe Diameter (Liquid Vertical . Spacing)

O Over 60 1 D -

51 - 6 0 1 1 CD 41 - 50 1 2

- Rarge of Ei g _

Centro data "U 36-40 3 1 O - - - > - Milistone ill

,n,xim m uppori O_ 31 - 35 3 6 1 8 1 .p.ning g _ _

26-30 4 2 3 3 4 1 y g _ __ _._ _ .__

$ 'g 21 - 25 4 5 7 1 8 6 7 , 2 1 1 16-20 5 4 11 2 7 > 6 15 1 11 -15 24 19 17 > 20 8 9 10 1 1 W _ , p >_ _

g 6-10 #47 16 43 1 15 6 13 14 4 1

.b 0-5 43 16 18 16 3 6 3 2 1 o_ i i i i i i i i i i i i i i i i i i RR

- e R, ~ R " R * , ,

2 Z $ R 8

- N Pipe Diameter, Inches i Figure 3-34 El Centro Plant Pipe Vertical Support 3 pacing, Liquid Filled

' D Pipes, All Schedules

1_ . . . .- _ . . ._

4 _.. _ ._ __

Pipe Support Specing vs. Pipe Diameter (Vapor Horizontal Spacing) s > > > .

O Over 60 3 2 10 2 2 , 4 1 2 1

@ 3 . kater of pipes _ , _

51-60 , 1 1 1 2' , 2

. %.,m, ceair ,i. > l

. y O 41 - 5 0 t2 1 > 2 1 1 2

> - Millstone all 1 >  !

- newiman moport

    • " 2 3 "U 36-40 2 1 1 1 1 0

3 3 2 31 - 35 g 1 1 1 1 , ,

(f) >

l ;

26-30 ] 1 1 1 1 3 j 2

m . _ _

E o

21 - 25 5 3 2 1 4 3 l O  !

h m

16- 20 3 1 1 1 1 2 2l  !

i i to 11 - 15 J

4 4 5 1 1 1 l'I t,

6-10 ! 1 5 5 1 3 _ l1 ,

i i

i4' d

7 a a. .ii 4

3-5 l 1 1 1 l2j .

LL l-' T ~- I 1 i i i i i i 1 T i i T- T i i i .

R= e q- q~qm - = = ec e=ag

- n 3

e 3

N Pipe Diameter, Inches Figure 3-35 El Centro Plant Pipe Horizontal Support Spacing, Air or Steam D Pipes, All Schedules

..+ .. _ .. . .. ._ . . . . w .. 3 .._ . .... . .

Pipe Support Spacing vs. Pipe Diameter (Vapor Vertical Spacing) .

O Over 60 O _

3 - NLnber of pipes _

51 - 6 0 2

- Range of El _ _ _

07 41 - 50

"" "" 1 1 2 2

,C _ _ _ _

> - Ministone att j j j j j j O 36-40 neximm support 0 -

cine O_ 31 - 35 1 2 2 1 g _ -._ __ ,

w 26-30 3 1 1 2 2 1 , 1 1 3 f, -+ > - _

~ ' 21 - 25 4 1 4 1 5 7 4 1 3 3 2 3 O >

16-20 5 1 5 3 > 2 1 2 3 11 -15 15 a 7

  • 19 1 2 2 1 3 1 3 6-10 16 7 16 2 1 6 3 2 1 0

.b 0-5 13 3 5 4 2 2 2 2 3 o- i i i i i i i i i i i i i i i i i i eR(

~

q~qn + = = ec e=ag

- e n 3

3 N

Pipe Diameter, Inches Figure 3-36 El Centro Plant Pipe Vertical Support Spacing, Air or Steam b Pipes, All Schedules

=

3.3.2 Comoarison of Supoort Tvoes and Desian

[

n

. . . The following support types are found at the El Centro. Plant:

'~

1. Rod Hangers
2. Field Supports
3. Dummy Supports
4. Springs
5. Guides
6. Pick-ups
7. Anchors i
8. Snubbers Types I to 3 are intended to provide resistance against dead load only.

,. Type 4 provides support-against vertical translations in both the upward and downward directions. Type 5 resists vertical translation in the downward direction only and lateral translation. Type 6 resists s.

vertical translations in both directions and lateral translation. Type 7 provides restraint against all translations and rotations. Type 8

[ resists sudden movements along its longitudinal axis. The number of c:l' each type of support are shown in Table 3-5 for the different pipe i

diameters. The El Centro Plant data base includes significant numbers of rod hangers, field supports, springs, and pick-ups.

l', The following types of supports are used for the Millstone III Category l" 2 piping:

[T  ; 1. Rod Hanger

2. Sliding Supports
3. Springs l,

I 3-52

g p ---.

,- rq :f, -A - , -

Table 3-5 El Centro Plant Pipe Supports Pipe Size, Rod Field Dummy (in) Hanaer Supports Supports Sprinas Guides Pick-uos Anchors Snubbers 3 34 52 3 1 0 15 1 0 li 23 11 1 0 2 9 0 0 2 35 48 2 3 0 7 2 0 3 6 33 0 0 2 0 0 0 Y 4 11 16 5 2 0 4 0 0 5 0 6 6 28 2 5 0 0 2 8 21 13 2 15 0 0 3 1 10 2 0 0 10 0 0 0 2 12 1 0 0 5 0 0 0 0 14 0 1 1 7 0 0 0 7 16 0 0 0 0 .0 0 0 0 18 0 7 0 13 0 0 0 13 20 0 0 o 2 0 0 0 2

it .. . . . . y ...a- -

Table 3-6 Millstone III Category 2 Pipe Supports Rod Pipe Size Sliding (in) Hanaer Support Sprina Restraint Anchor Snubber 3 152 207 5 112 97 0 4 180 241 21 199 55 9 6 43 51 11 42 11 0 8 7 15 5 31 5 0 w

& 10 26 58 3 8 6 0 a

12 7 2 8 3 3 0

4. Restraints -

F 5. Anchors I 6. Snubbers

. j-Sliding supports provide the same type of resistance as hanger rods.

,, Restraints (U-bolts, sway struts, and box frames) function similar to t !. ' the El Centro Plant pick-up supports. The numbers of each type of support are listed in Table 3-6 for each pipe diameter. Most of the Millstone III Category 2 pipe supports consist of rod hangers, sliding supports, and restraints.

4 A comparison of the El Centro Plant data base shows that all of the different types of functions (one way, two way, etc.) of the Millstone

III Category 2 pipe supports are included in the El Centro Plant data base. Furthermore, the data base contains certain support types that are not used at Millstone III. The range of pipe diameters attached to the data base pipe supports also generally encompasses the range of Millstone III pipe diameters. The Millstone III Category 2 piping utilizes significantly more restraints and anchors. These supports p provide greater resistance against vertical and lateral movements. The

! Millstone III piping would be expected to be stiffer and thus less vulnerable to seismic interaction than the data base piping.

This comparison shows that the type and function of the El Centro Plant

' data base pipe supports as well as the range of pipe diameters attached

',' to these supports generally envelopes the Millstone III Category 2 pipe supports. A quantitative assessment of the pipe support capacities was

. not performed. However, review of the small bore pipe support details and the large bore design criteria indicates that degree of resistance provided by the Millstone III Category 2 pipe supports would be expected to be at least as great as the support resistance contained in the El Centro Plant data base.

3-55 h

j

4. CONCLUSIONS Criteria to identify potential seismic interactions between Category 2 i

components not designed for seismic load with Category I components at

the Millstone III Nuclear Power Plant were developed in Reference 1. -

This criteria was based upon the use of experience data from past earthquakes to identify and account for realistic seismic interactions.

The study described in this report was conducted to present the quantitative' experience data supporting the conclusions of Reference 1 regarding the hazard to Category 1 components posed by seismic interaction with Category 2 piping.

The conclusions of Reference 1 are appropriate so long as the key i

parameters of the experience data base facilities envelope the corresponding parameters of the Millstone III Category 2 piping. The key parameters that influence the potential for and damage due to c seismic interaction are seismic input, piping parameters, and support parameters. In this study, comparisons were made between the El Centro

Plant data base and the Millstone III Category 2 piping. These comparisons were performed for

4 W 1. Ground motion response spectra

2. In-structure response spectra
'- 3. Piping materials
4. Piping sizes t 5. Piping operating conditions i.
6. Piping components and construction ,
7. Support spacings
8. Support types and design The quantitative comparisons performed for each of these parameters demonstrate that the El Centro Plant data base generally envelopes the 4

4-1

! Millstone III Category 2 piping. It should be noted that the El Centro Plant is only one facility contained in the seismic experience data It is expected that enveloping of the Millstone III Category 2

{ base.

piping could be extended by incorporating data from all of the data base

'~

facilities.

Because the key parameters of the experience data base envelope the parameters of the Millstone III Category 2 piping, it can be concluded that the use of experience data to identify realistic seismic interactions and the level of seismic motion at the threshold of occurrence is valid. The criteria recommended in Reference 1 for the performance of a seismic interaction study at Millstone III are appropriate.

.g.

s i

t' 2

c.

1 9

t

REFERENCES

1. "The Application of Experience Data to Seismic Interaction at the Millstone III Nuclear Power Plant", prepared for: Northeast Utilities Service Company, EQE Incorporated, January 1985.
2. Kennedy, R.P. , von Riesemann, W. A. , Ibanez, P. , Schiff, A.J. , and Wyllie, L.A., "Use of Past Earthquake Experience Data to Show Seismic Ruggedness of Certain Classes of Equipment in Nuclear Power F Plants", Senior Seismic Review and Advisory Panel, prepared for the i Seismic Qualification Utility Group, Revised January 1985.
3. Bumpus,'S.'E., Johnson, J.J., and Smith, P.D., "Best Estimate Method 3 vs. Evaluation Method: A Comparison of Two Techniques in Evaluating Seismic Analysis and Design", prepared for Division of Reactor Safety Research, USNRC, Lawrence Livermore National Laboratory, f_ NUREG/CR-1489, UCRL-52746, May 1980.
4. " Seismic Sa'ety Margins Research Program, Executive Summary Number 1-Best Estimate vs. Evaluation Method", prepared for U.S. Nuclear

[ Regulatory Commission, Lawrence Livermore Laboratory, LLL-TB-026.

, 5. Murray, R.C. Nelson, T.A., et.al, " Response of El Centro Steam Plant Equipment During the October 15,1979, Imperial Valley Earthquake",

Lawrence Livermore Laboratory, NUREG/CR-1665, UCRL-53004, September, 1980.

!~

6. "Investigaticns of the Effects on Structures of Three California Earthquakes", URS/ John A. Blume & Associates, Engineers, April, 1981.

, p I

7. Kennedy, R.P., Short, S. A., et.al, " Engineering Characterization of Ground Motion Task I: Effects of Characteristics of Free-Field Motion on Structural Response", Structural Mechanics Associates,

,. NUREG/CR-3805, April,1984.

$ 8. " Power Piping During and After Earthquakes", prepared for: Electric Power Research Institute, EQE Incorporated, To be published October 1985.

L g.

i l

R-1 M

r e

F t-1 Appendix A El Centro Steam Plant' Unit 4 Pipe Line List 4

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