NL-08-061, Reply to Document Request for Additional Information Regarding Site Audit Review of License Renewal Application

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Reply to Document Request for Additional Information Regarding Site Audit Review of License Renewal Application
ML081230243
Person / Time
Site: Indian Point  Entergy icon.png
Issue date: 04/23/2008
From: Dacimo F
Entergy Nuclear Operations
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-08-061
Download: ML081230243 (14)
v • d • e


Text

Indian Point Energy Center 450 Broadway, GSB

-Entergy P.O. Box 249 Buchanan, N.Y. 10511-0249 Tel (914) 788-2055 Fred Dacimo Vice President License Renewal April 23, 2008 Re: Indian Points Unit 2 & 3 Dockets Nos. 50-247 & 50-286 NL-08-061 U.S. Nuclear Regulatory Commission ATTN: Document.Control Desk Washington, DC 20555-0001

SUBJECT:

Reply to Document Request for Additional Information Regarding Site Audit Review of License Renewal Application for Indian Point Nuclear Generating Unit Nos. 2 and 3

Reference:

NRCletter dated November 8, 2007, "Summary of Site Audit Related to the Review of the License Renewal Application for Indian Point Nuclear Generation Unit Nos. 2 & 3"

Dear Sir or Madam:

Entergy Nuclear Operations, Inc is providing, in Enclosure 1, the additional information requested in the reference letter pertaining to NRC audit of review of License Renewal Application for Indian Point 2 and Indian Point 3. The additional information provided in this transmittal addresses staff questions related to potential acute shock effects associated with transmission lines (identified as items #24 and 25 of reference letter).

During the audit, Entergy provided written documentation from Consolidated Edison that the 345 kV transmission lines to the Buchanan Substation, met the New York State Public Service Commission 4.5 mA criteria. However, the calculations to support this were not available.

Therefore, Entergy commissioned a new study to demonstrate that the high voltage transmission lines from Indian Point meet the steady state induced short circuit current requirements of both the New York Public Service Commission (4.5 mA) and the current edition of the National Electric Safety Code (5 mA). A copy of this report is included as Enclosure 1.

As demonstrated in the report, the lines of concern are currently nearly double the height necessary to meet the criteria Therefore, the Transmission Lines are acceptable right now as is. In the future, if there is a major configuration change at the Broadway crossing, IPEC will use the approved maintenance procedure (0-HVE-401-ELC) to ensure that the road clearances are acceptable at that time.

NL-08-61 Docket Nos. 50-247 & 50-286 Page 2 of 2 If you have any additional questions or require additional information, please contact Mr. R.

Walpole, Manager, Licensing at (914) 734-6710.

I declare under penalty of perjury that the foregoing is true and correct. Executed on Sinc Fred R. Dacimo Vice President License Renewal

Enclosure:

1. Enercon Study ELEC-IP-08001 for Indian Point License Renewal Project 345 kV Transmission Line-Induced Shock Study cc: Mr. Samuel J. Collins, Regional Administrator, NRC Region I Mr. John Boska, NRR Senior Project Manager Mr. Bo M. Pham, NRC Senior Project Manager Mr. Drew Stuyvenberg, NRC Environmental Project Manager Mr. Sherwin E. Turk, NRC Office of General Counsel, Special Counsel Mr. Paul Eddy, New York State Department of Public Service IPEC NRC Resident Inspector's Office Mr. Paul D. Tonko, President, New York State Energy, Research, & Development Authority

ENCLOSURE 1 TO NL-08-061 Enercon Study ELEC-IP-08001 for Indian Point License Renewal Project 345 kV Transmission Line-Induced Shock Study ENTERGY NUCLEAR OPERATIONS, INC INDIAN POINT NUCLEAR GENERATING UNIT NOS. 2 and 3 DOCKETS 50-247 AND 50-286

ATTACHMENT 9.1 VENDOR DOCUMENT REVIEW STATUS APPLIQUE' Sheet I of I MANAGEMENT MANUAL

.,

-- FOR ACCEPTANCE E] FOR INFORMATION E IPEC L] JAF . LW PLP L[ PNPS [ VY EI ANO L] GGNS E] RBS LIW3 t

Document No.: ELEC-IP-08001 I Rev. No.DATED 3/26/2008 Document Title: Enercon Study ELEC-IP-08001 for Indian Point License Renewal Project 345 kV Transmission Line-Induced Shock study EC No:IP2-06-32959 . . Purchase Order No.

STATUS NO:

1. E ACCEPTED, WORK MAY PROCEED
2. -1 ACCEPTED AS NOTED RESUBMITTAL NOT REQUIRED, WORK MAY PROCEED
3. LI ACCEPTED AS NOTED RESUBMITTAL REQUIRED 4.; 3] NOT ACCEPTED Acceptance does not constitute approval of design details, calculations, analyses, test methods, or materials developed or selected by the supplier and does not relieve the supplier from full compliance with contractual negotiations.

Responsible Engineer wx~~~I~ e /CAY- 4

  • IfI +.( f Print Name Date

, /gqature Engineering Supervisor KAREN TOM F

  • 4/15/o8 J

LEnteigy I0 ENERCON E*TIERGY IMUCAR Enercon Study ELEC-IP-08001 for Indian Point License Renewal Project 345 kV Transmission Line-Induced Shock Study A

4111/08 Prepared by: Date: /0 f Reviewed by: Date:.~/

Indian Point License Renewal Project 345 kV Transmission Line Induced Shock Study

Executive Summary This report shows the method and results used to demonstrate that the high voltage transmission lines (345 kV) from the Entergy's Indian Point Nuclear Stations meet the steady state induced short circuit current requirements given in the current edition of the National Electrical Safety Code (2007 Edition).

Background

Entergy Nuclear Indian Point 2, LLC and Entergy Nuclear Indian Point 3, LLC (hereafter referred to as "Entergy") have submitted an Environmental Report (ER) in conjunction with the application to the U.S. Nuclear Regulatory Commission (NRC) to renew the operating licenses for Indian Point Units 2 and 3 (IP2 and IP3) for twenty years beyond the end of the current license terms. This requires the preparation of volumes of studies and analyses to show the facilities remain safe and viable. As part of these evaluations, the transmission lines that connect these plants to the electric system are evaluated. While these lines have typically not changed in their usage, the governing safety regulations have changed since original construction.

Specifically, the National Electric Safety Code (NESC)1 establishes the minimum safety requirements for electric lines, and has changed to include a limitation on the magnitude of induced current available from a vehicle parked under these lines2. As a result, the Nuclear Regulatory Commission (NRC) now requires that each plant being re-licensed to evaluate the 2 transmission lines supplying the power plants to ensure conformance with the current NESC.

This requirement is the basis for the Indian Point 345 kV Transmission Line Induced Shock Study, which demonstrates conformance to the NESC requirements. In addition, this study also demonstrates conformance with the more restrictive induced shock hazard limit of 4.5 mA required by New York Public Service Commission.

There are two (2) in-scope 345 kV transmission lines that transmit power from Entergy's Indian Point Nuclear Stations #2 and #3 to the nearest switchyard just across Broadway. The 138kV lines are at similar ground crossing heights to the 345kV line and are therefore enveloped by this study.

National Electrical Safety Code 2007, American National Standard C2 2 NESC Rule 232Clc Indian Point License Renewal Project 345 kV Transmission Line Induced Shock Study Page 2 of 10

Study Overview The process used to determine conformance to the NESC requirements requires the following basic steps:

Data Collection This phase collects information about the transmission line geometry, utilization and right-of-way (R/W) configuration.

Data Review Data that is collected is organized into a useable form and checked for errors and consistency. Some parameters are directly calculated in this step using source data.

R/W Cross-Section The data is reviewed to choose a limited number of R/W cross sections that represent roadway crossings and areas with low phase conductors.

Electric Field Level The various cross sections are modeled in electric field software to calculate the electric field levels that are expected to exist under the transmission lines.

Short Circuit Current Using the electric field strengths calculated, an EPRI example is used to calculate the hypothetical steady-state current between a vehicle under the line and ground. This current is limited to 5 mA in the current NESC.

Data Collection Data detailing the transmission lines and network connecting into the Indian Point plant was obtained from Entergy's Transmission Group. The information received from Entergy generally included the following types of information:

" Transmission phasing diagram

" Structure drawings

  • Transmission line data Data Review and Summarization From the documentation provided the height of each individual phase conductor above ground was determined for performance of the shock analysis portion of the study. In cases where the actual line height could not be determined from the prints, a SupaRule Cable Height Meter ultra-sonic measuring device was used to determine actual line height at location. Entergy's structure list information was provided in an Excel spreadsheet in electronic form. This data provided information about each structure in the appropriate transmission lines, along with information on each span (i.e. structure number, pole size / height, wire span, pole setting depth, and reference to a structure framing standard).

The following steps were also performed to validate Entergy information:

1. Determined the height above ground for the transmission phase conductors at the crossing of Broadway using the actual wire heights.
2. Used these wire heights as the minimum wire height above ground for each conductor.

Indian Point License Renewal Project 345 kV Transmission Line Induced Shock Study Page 3 of 10

Electric Field Strength Calculations The right-of-way geometry depicted in the cross section for Broadway was used as the source to enter the line geometry into the EPRI TLWorkstation calculation software. This software is an industry accepted and tested model used to calculate electric and magnetic field strengths, and audible noise levels that exist along a transmission line corridor. For this analysis, only the electric field strengths are of interest.

The portion of the resulting output (Attached Below) summarizes the geometry that was used for the model of the R/W cross section at Broadway. Each of the Lines included in the calculation is represented in the table. Each three-phase circuit is identified as a circuit, along with each static wire. All conductors are individually identified as a bundle. Voltage (Phase to Phase), current (which is arbitrarily set to 2400 Amps), and voltage and current phase angles are provided. This analysis focuses on the effects of capacitive charge buildup on vehicles, therefore only the voltage parameters are of importance. These parameters are voltage, voltage angle, and the X &

Y coordinates of each wire. The coordinates are generated from the appropriate cross section of the right-of-way at the location or roadway with minimum ground clearance.

Short Circuit Current Calculations Once the highest ground level electric field strengths are determined from the TLWorkstation program for the cross section, a calculation is made to determine the maximum possible short circuit current. This current could occur between a large vehicle parked under a transmission line and the ground. The NESC concern is that this current could pass through a human body. The vehicle will act as a large charging capacitor since it is insulated from ground by tires, and is exposed to an electric field. The amount of charge that can build up on the vehicle is directly proportional to the size of the vehicle and the strength of the electric field. Therefore for this analysis the largest possible vehicle is chosen. For conservatism, the maximum field over the xz plane of the road crossing is used since the electric field strength varies along the length of a large vehicle. The procedure used to perform these calculations is outlined in the Electric Power Research Institute (EPRI) Transmission Line Reference Book, 200kV and Above, Third Edition.

This document is the industry-accepted reference for transmission line design and field effects.

Using the methods, and tables detailed in section 7.8 of the EPRI book and the specified parameters for a 65-foot long tractor-trailer, spreadsheet calculations were made for the crossing at Broadway.

Note: The EPRI parameters for a 55-foot long tractor Trailer were used but the length was increased to 65 feet to meet the maximum New York restrictions.

Indian Point License Renewal Project 345 kV Transmission Line Induced Shock Study Page 4 of 10

Figure 1: Shock Currents from Vehicles - Measured Cable Heights Shock Currents from Vehicles Indian Point - 345kV lines across Broadway Maximum E-Fields on the R/W Based on EPRI Transmission Line Reference Book, 200kV and Above Electric Fields from EPRI Model 1.4 kV/M peak E Field 1.4 kV/M From EPRI Model Vehicle Dimension -

65.00 Ft Long = 19.81 meters 8.00 Ft Long = 2.44 meters 13.50 Ft Long = 4.11 meters From Table 7.8-3 for a solid rectangle H= 4.11 A= 19.81 B= 2.441 Therefore: A/B= 8.125 A*B= 48.30958 H/B= 1.6875 S/AB = (1 +(1.4+(5/(ANB)A.6))*(0. 1*(H/B)A .5+.78*(H/B)+.07*(H/B)A2+.01 *((H/B)/(NB))A3))

S/AB = 5.644775 S= 272.6967 Isc=jwES= 377*8.85*1OA12E*S Isc= 1.27 mA Indian Point License Renewal Project 345 kV Transmission Line Induced Shock Study Page 5 of 10

Conclusions The calculations for maximum steady state induced current was made for the Indian Point 345 kV transmission lines that transport electric power from the Stations to the first switchyard. The calculation process utilized data from the Entergy, EPRI TLWorkstation Computer Code, and EPRI accepted calculation methodology. The resulting calculated values are well below the NESC 5 mA steady state current limits detailed in NESC Rule 232C1c. Therefore, the Indian Point 345 kV transmission lines are in conformance to NESC requirements. A theoretical run was also done using TLWorkstation to demonstrate that a lowered line height of 32 feet would be what is necessary to drive the induced current to 4.5mA New York Public Service Commission limit. This theoretical report is also attached below.

Indian Point License Renewal Project 345 kV Transmission Line Induced Shock Study Page 6 of 10

Table 1: TLWorkstation Output Profile: Truck Profile Points distributed laterally from 100.00 ft to 200.00 ft in 4.00 ft 1 1.4 =MaxkV/M 100 667 0.858 0.112 0.843 0.002 184 776 1.103 0.041 1.101 0.044 184 780 1.056 0.038 1.054 0.049 184 784 1.004 0.036 1.001 0.054 1848 788 0.947 0.034 0.944 0.059 184 792 0.886 0.031 0.883 0.062 184 796 0.822 0.029 0.819 0.064 188 660 1.418 0.05 1.418 0.001 188 664 1.418 0.049 1.417 0.001 188 668 1.4171 0.048 1.416 0.002 188 672 1.416 0.048 1.415 0.002 188 676 1.415 0.047 1.414 0.002 188 680 1.414 0.047 1.413 0.002 188 684 1.412 0.046 1.412 0.002 188 688 1.411 0.046 1.41 0.002 188 692 1.409 0.045 1.408 0.002 188 696 1.406 0.045 1.406 0.003 188 700 1.404 0.044 1.403 0.003

-188 704 1.4 0.044 1.4 0.004 188 708 1.397 0.043 1.396 0.004 188 712 1.393 0.043 1.392 0.005 188 716 1.388 0.043 1.387 0.005 "188 720 1.382 0.042 1.382 0.006 188 724 1.376 0.042 1.375 0.007 782188 1.368 0.041 1.367 0.0081 188 732 1.359 0.041 1.359 0.01 188 736 1.3491 0.041 1.348' 0.011 188 740 1.337 0.04 1.336 0.013

- 188 744 1.3231 0.04 1.323 0.015 188 748 1.307 0.04 1.306 0.017 188 752 1.288 0.039 1.288 0.02 188 756 1.267 0.038 1.266 0.023 188 760 1.242 0.038 1.241 0.027 188 764 1.213 0.037 1.212 0.031 188 768 1.179 0.036 1.178 0.035

    • See Figure 2 For Plan View depicting Orientation of X and Z axis, Y axis is Height Indian Point License Renewal Project 345 kV Transmission Line Induced Shock Study Page 7 of 10

Protile 950

900 Description 850 800 750

=700 650 600 550 500 N

450 400 350 300 250

.200 Audible Noise 150 Couplingl5hielding 100 Detector, 4 00Ft Calculate Electric Field 50 Bandwidth:

4.000 0t t 0 Magnetic Field I

I Figure 2: TLWorkstation Profile Specifications I Indian Point License Renewal Project 345 kV Transmission Line Induced Shock Study Page 8 of 10

Figure 3: Shock Currents from Vehicles - Theorized Cable Theoretical Shock Currents from Vehicles at Lowered Line Height Indian Point - 345kV lines across Broadway Maximum E-Fields on the R/W Based on EPRI Transmission Line Reference Book, 200kV and Above Electric Fields from EPRI Model at Conductor Height 32' Above Ground 4.9 kV/M peak E Field 4.9 kV/M From EPRI Model Vehicle Dimension 65.00 Ft Long = 19.81 meters 8.00 Ft Long = 2.44 meters 13.50 Ft Long = 4.11 meters From Table 7.8-3 for a solid rectangle H= 4.11 A= 19.81 B= 2.44]

Therefore: A/B= 8.125 A*B= 48.30958 H/B= 1.68751 S/AB = (1+(1.4+(5/(A/B),.6))*(0.*1*(H/B)^5+.78*(H/B)+.07*(H/B)^2+.01*((HIB)/(AIB)) A3))

S/AB = 5.644775 S= 272.6967 Isc=jwES= 377*8.85*1OA.-12E*S lsc= 4.46 mA Indian Point License Renewal Project 345 kV Transmission Line Induced Shock Study Page 9 of 10

Enercon Study ELEC-IP-08001 Attachment A Page 1 of 1 IPEC OVERHEAD TRANSMISSION LINES CABLE DATA (LOOKING EAST)

CABLE HEIGHT CABLE DISTANCE LINE LEFT MIDDLE RIGHT L-M R-M 1 61.04 63.03 59.08 23-24 23-24 2 56.03 58.04 54.08 23 - 24 23 - 24 3 57.03 57.07 54.05 23 - 24 23 - 24 4 58.03 62.01 59.01 19-20 19-20 5 68.06 N/A 67.04 35.00 NOTES:

1) SEE ENTERGY DRAWING NO. EO-16214-A
2) LINE 1 = NORTHERN MOST TRANSMISSION LINE
3) CABLE HEIGHT = FEET ABOVE BROADWAY ROAD SURFACE
4) CABLE DISTANCE = BETWEEN ADJACENT CABLES AT BROADWAY Page 10 of 10
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