IR 05000424/1988022

Insp Repts 50-424/88-22 & 50-425/88-29 on 880516-19.No Violations or Deviations Noted.Major Areas Inspected: Electrical Cables,Raceways,Termination Installation Records,Instrumentation Transmitters & Sensing Lines

ML20151G021
Person / Time
Site:	Vogtle
Issue date:	07/08/1988
From:	Conlon T, Hunt M, Mark Miller NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
Shared Package
ML20151G009	List: IR 05000424/1988022 ML20151G005
References
50-424-88-22, 50-425-88-29, NUDOCS 8807280082
Download: ML20151G021 (9)

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, p*+*. " %.~ ' 's p   UNITED STATES g .j . NUCLEAR REGULATORY COMMIS810N o *  REGION ll
 [  101 MARIETTA ST., \e,,,o   ATLANTA, GEORGIA 30323 l Repott Nos.:- 50-424/88-22 and 50-425/88-29 Licensee. . Georgia Power Company P. O. Box 4545 Atlanta, GA 30302 Docket Nos.: 50-424 and 50-425    License Nos.: NPF-68 and CPPR-109 Facility Name: Vogtle 1 and 2
' Inspection Conducted: May 16-19, 1988 Inspectors:  k1/) Msb z. ,     '7/T[[

M. D. Hunt ' ~ ' Oge figned M.R91A M. N. Mil'er 7/7/<ss Odter Signed Approved by: //AWA 4 rn LL 7 /S'/ W r.' E. Corflof, CXief Date' Signed Plant Syt h ms Section Division cf Reactor Safety SUMMARY Scope: This routine, unannounced inspection was in the areas of electrical cables, raceways, terminations installation records, instrumentation transmitters, associated sensing line;, as-build drawings, and an employee concer Results: No major weaknesses were found in the areas of instrumentation installation and testin The procedures appeared adequate to install and test instrument loops as evidenced by the documentation and QA records. All records reviewed were complete and adequately reviewed. A problem identified in the employee concern portion of this report was subsequently resolved as note No violations or deviations were identifie PDR ADOCK 05000424 Q PDC

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REPORT DETAILS

, Persons Contacted Licensee Employees
 *J. E. Aaams, Lead I&C Engineer Mechanical Discipline
 *A. 8. Gallant, Project Compliance Coordinator
 *E. D. Groover, Quality Assurance Site Manager - Construction
 *R. E. Hollands, Electrical Construction Supervisor
 *R. H. Pinson, Vice President Construction
 *P. D. Rice, Vice President and Project Director
 *J. E. Sanders, Assistant Project Manager
 *D. W. Strohman, Project Q Other licensee employees contacted during this inspection included craftsmen, engineers, technicians, and administrative personne Other Organization D. W. Strohman, Project Quality Assurance Engineer - Dechtel NRC Resident Inspector R. Schepens
 * Attended exit interview Inspection Background The inspector planned a system based electrical and instrumentation inspection for the Auxiliary Feedwater (Aux FW) system. Included are the associated level instruments for the steam generators which provide the reactor trip signals and initiate the starting of the Aux FW pumps and opening of the control valves to the steam generators. The purpose of the inspection was to follow the paths from initiating instrumentation to actuation of the field control devices. This required a walkdown of the instrumentation, verification of the cable routes from the instruments to the process control cabinets, verification of the electrical control cables from the process control cabinets to the field control devices and a review of records and drawing The Functional Diagrams 72407 Sheet 7, Steam Generator Trip Signals and Sheet 15, Auxiliary Feedwater Pumps Startup were reviewed to select the instruments (low low level transmitters) which provide the actuating
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signal Process and Instrumentation, P&I Diagram 2X4DB161-2, Revision 18, Auxiliary Feedwater System System No.1302 was reviewed to

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%   2 select the two motor driven feedwater pumps and injection valves to Steam Generators 3 and 4. P&I Diagram 2X4DB 159-1, Revision 19, Main Steam System System No. 1301 was reviewed and used for the walkdown of the level transmitter Details of the electrical control cables, instrumantatior cables, cable terminations and records are provided in Paragraph Details of the instrumentation are in Paragraph % Electrical Component and Systems - Work Observation (51053), Electrical Cables - Work Observation (51063) and Record Review (51065)

The inspector examined electrical controls cables in the Auxiliary and Control Buildings for the safety-related Auxiliary Feedwater System. The s

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cables were for the two motor driven feedwater pumps and the four motor operated control valves feeding Steam Generators 3 and 4. The control cables and termination for the pumps were verified from the process control cabinets in the control room to the motor control centers (MCC).

The two pumps are: Aux. Feedwater Pump 2-1302-P4-003 Train "A" Aux. Feedwater Pump 2-1302-P4-002 Train "B" The control cables and terminations for the .four valves were verified from the process control cabinets in the control rooin to the MCC for each valve and from each MCC to the valves. The four valves selected in the Aux FW system are: HV-5120 Train C Steam Generator 4 HV-5137 Train A Steam Generator 4 HV-5127 Train C Steam Generator 3 HV-5134 Train A Steam Generator 3 Note: Train C - Turbine Driven Aux FW pump feeds both Steam Generators 3 and Instrumentation cables and terminations for eight level transmitters (4 each for Steam Generators 3 and 4) were examine The cables and terminations were verified from the instruments to the Electrical Penetration Assemblies (EPA) inside the Reactor Building.. In addition, the cable for the signals were verified at the EPAs frem outside containment (Reactor Building) to the process control cabinets in the control roo The electrical control and instrumentation cables were examined to assure .

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the requirements in Procedures ED-T-07, Cable Installation and ED-T-08, Cable Terminations were followed. The routing of various cables was reviewed and verified from the instruments, valves, MCCs and control

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 , cabinets to the cable tray routing listed on the cable "pull cards." In certain instances, the routing was only verified to the point where the cable exited conduit and entered a cable tray containing similar cables or exited the cable tray to enter a cabine In addition, the cables and raceways were inspected to' assure proper identification and train or channel color coding was maintained. Special attention was given to assure channel separation and segregation of instrument, control, and power cable Cable terminations, including splices were examined to verify the points specified-in the "cable termination cards" and elementary wiring diagrams were in agreement. Cable splices in the containment building were examined for instrument cables and the records specified a splice kit number. -When the inspector was examining the splices in the EPA No. 23PY36 other termination were being performed. The craft were following Procedure ED-T-08 and a QC inspector was observing the work. The electrician was knowledgeable and performing his work in a professional manne For each cable and termination examined, the inspector reviewed wiring and cabling drawings, cable installation cards and cable termination card The cable inspection records and the termination inspections records were reviewed and signed by QC inspector ,

In general, the cables were inspected for various attributes, such as:

 - The cable and termination have been installed according to the latest drawings
 - The cables, wires and raceways have been properly identified
 - Cable separation and independence has been maintained
 - The junction boxes and cabinets are free of debris  ,
 - The cables are protected and free from damage
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 - QC inspections have been performed and documented The following electrical control and instrumentation cables and associated devices were examined:

Electrical Control Cables Valves HV-5120 HV-5127 HV-5137 HV-5137 N Cable 2CDIM0I5M ------- 2BBB39SD 2ABB37SD (At VaTve) ' Cable 2CDIM0!SN 2001M04SP 2BBB395H 2ABB37SH (FromMCC) t

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s 4 s Cable 2CDIM0!SB 2CDIM04SB 2BBB3958 2ABB37SB '

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Cable 2CDIMOISA 2CDIM04SA 2BBB39SA 2ABB37SA Control Room Panel 2CCQMCBB01 2CQMCBB01- 2ACQMCBBOI' 2ACQMCBB02'

 -Cabinet - Plug   BI  P-4   BI P-7 B2 - P-IL 82 P-02 FW Pump   Train A     Train B Cable   .2AA0217SB     2BA0321SB
 '(at MCC)
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Cable 2AA0217SA 2BA032ISA i Control Room Panel ~ 2ACQMCB803 2BCQMCBB01 Plug P-201 P-9

 : Instrument cables, junction boxes, EPAs, and Control Room Panels

, Instrument Cables Termination EPAs Control Box Containment Room Inside Outside Panel 2LT-537 24CQPS4AZD 20TJB2456 24PY47 24PX47 24CQPS4 24CQPS4AZE , . 24CQPS4AZF 2LT-538 23CQPS3ZG 2CTJB2457 23PY36 24PX36 23CQPS3 23CQPS3XK 23CQPS3XJ 2LT-539 21CQPSIZ7 2ATJB2458 21PY20 21PX20 21CQPSI 21CQPSIXU 21CQPSIXT  ; t-2LT-553 22CPRS2XM Not 22PY48 22PX48 22CQPS2

22CPRS2XL Assessable 2LT-547 24CQPS4YS 2DTJB2461 24PY47 24PX47 24CQPS4 24CQPS4XM 24CQPS4XL 2LT-548 23CPRS3AXD 2CTJB2462 23PY36 23PX36 23CQPS3

23CPRS3AZE '

23CPRS3AZF

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2LT-549 22CPRS2Z3 2BTJB2468 22PY48 22PX48 22CQPS2 22CPRS2XI 22CPRS2XS ,

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2LT-554 21CQPSIZ5 2'ATJB2467 21PY20. 21PX20 21CQPSI 21CQPSIXP 21CQPSIXN i Within the areas examined, no violations or' deviation were identifie . Instruments and Components - Work Observation (52053) and Records Review

 .(52055)
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The inspector performed walkdowns in the Reactor Building to examine the completed installations of level transmitters for Steam Generators 3 and.4. The instruments selected provide the trip signals, low low level, to the process control cabinets to start the Aux FW system. The work inspected included the sensing lines, tubing runs, instrument and root valves, and support The sensing lines and tubing runs were inspected to ensure adequate separation for each channel. The pressure rating and range of each transmitter was verified. The as-built condition was verified and the as-built redline drawings were reviewed for the incorporation of design changes, Field Change Notices (FCN), and QC verifications. The FCNs were reviewed to ensure that design changes were evaluated, reviewed and approved by' qualified engineering personnel . Other attributes that were inspected are:

  -   The location, configuration and installation in accordance to the latest approved design drawings and construction specification The specified instruments and components have been use The components and lines have been correctly and permanently identified and the channel identification color codes are as specifie The cleanliness and protection requirements have been maintaine The instruments and as-built redline drawings that were inspected and reviewed are:

Instrument Instrument and Sensing Line Isometric LC

*      As-Built Red-Line Drawing Verification 2LT-537    2X50Y00537-A  10-28-87 2SK5Y00537-N  10-15-87 2LT-538    2X50Y00538-A  10-28-87 2SK5Y00538-N  11-12-87 i 2LT-539    2X5DY00539-A  10-28-87 2SKSY00532-N  1-26-88 i

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2LT-547 2X5DY00547-A 1 11-02-87 , 2SK5Y00547-N .12-07-87 '

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2LT-548 2X5DY00548-A 11-02-87 2SK5Y00548-N 10-19-87 ; I 2LT-549 2X5DY00549-A 11-02-87 i 2SK5Y00543-N 1-28-88 2LT-553 2X5DY00553-A 10-28-87 2SK5Y00503-N 1-26-88 e 2LT-554 2X50Y00554-A 11-02-87 2-11-88

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' 2SK5Y00504-N Within the area examined, no deviations or violation were identifie . Employee Concern The NRC is frequently contacted by . individuals who express concerns relating to design, a.'d construction and safe operation of nuclear plant Followup inspections are performed by the staff to determine the significance of'the concern and to insure that the health and safety of the public is protecte Concern: A serious electrical phasing problem has existed at Vogtle Nuclear Generation Station since the Summer of 1984 when main and auxiliary transformer connections were made to the 4160V bus with Calvert Bus (cable). Changes made to wiring diagrams had reversed the phase rotation on a number of 4160V delta / delta transformers without showing these changes on the main station phasing diagram and appropriate load center single line drawing Discussion: Interviews were conducted with design, construction and operations personnel in an effort to determine the events and resultant actions surrounding this concer Documentation reviews in the areas of design ir -ings, connection diagrams, construction procedures, construction ifications and operating plant maintenance procedures were conducte concern arose in 1984 when Field Change Notices (FCN) E-FCRS-1103 and-FCRB-8349 were issued that revised the phase orientation for 480V switchgear, switchgear bus INBL2 transformer, and breakers 01 and 02 to provide clarification for terminating power cables to the high sides of the 4160/480V load center transformers. Drawing 2X3D-AA-B098, Phasing Diagram Unit No. 2 was revised to show the proper phasing at transformers 2NXRB and 2NXRA. The connection diagrams indicated the phase orientation as ABC when viewed from the high side of the transformers and rear of the

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switchgea Corrections were made to properly locate the phases A-B-C, left-to-right when viewing the low side of the transformers and the front of the switchgea The equipment was furnished with the phase requirements being A-B-C, lef t-to-right, top-to-bottom and front-to-back

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as specified. The connection diagrams'were corrected to produce the A-B-C phase orientation at the switchgear high side terminals when viewed from the front. The 4160/480V and 13.8 KV transfonners are wired such that the secondary winding terminals are connected phase A to Terminal X , Phase B tc Terminal X and phase C to Terminal X3 . The GPC electricaf system phase rotatiok sequence is A-C-B. Standard notation for phase rotation sequence is A-B-C which is also the standard high side and low side winding notations. The sequence of rotation is governed by the system phase rotation. The GPC system phase rotation remains A-C-B but the standard rotation sequence A-B-C was retained for the project. The result is that care must be exercised in the connection of motors and generator The motors must be connected to obtain the correct rotation for electrical phase A-C-B rotation sequenc To insure that proper connection requirements for motors was addressed and administered, maintenance procedures 25525-C (for motors) properly and 26836-E (for motor operated valves) were examined to verify that measures are taken to insure that correct motor rotation is verified when motor leads are connecte Construction Specification X3AR01-E2 Rev. 16 addresses the proper connection requirements for large motors and motor operated valve Additionally, in support of the 580 terminations program, drawing 2X3D-AA-A000, General Notes and Symbols Connection Diagram contains a note advising th&t "the phase rotation of power distribution system is A-C- Field to verify motor rotation before terminating power cables to motors."

Electrical Construction Specification X3AR01 Sections E2 and E9 were revised to provide for the phasing changes when terminating large three phase motor and motor operated valve drive unit During this inspection, the inspector was advised that an Operations Deficiency Report (0DP) No. T-2-88-20-805 had been issued regarding a protective relaying condition on diesel generator (D/G) DG2A and DG2 During a live relay test at the time of the D/G extended run, it was found that the Voltage Balance Relay responded backwards. The vendors instructions stated that the phase sequence should be A-B-C, however, the D/G phase sequence is A-C-B. An ODR No. 1-88-1292 was issued for the Unit 1 D/Gs A&B for the same deficiency. Until corrections are made the equipment (potential transformers) fuses will be verified every 24 hour Findings: This concern is partially substantiated. The revision of the phasing and termination diagrams were necessary to correct what appeared to be an error in the orientation of the terminals for the high side of various ' 4160 V,13.8 KV and 480V transformers, switchgear and bus connection Since the transformers are passive, if the phasing is the same throughout the plant no problem is anticipate There is no interconnection of transfonners that would cause phasing mismatch, however, attention must be

m'intained when terminating 3 phase equipmen g- . 3

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The care in _ termination of 3 phase equipment not only requires t e power leads 'be correctly connected but any protective relaying furnished with the_ equipment must be carefully reviewed for proper phase monitoring. In all instances this was not accomplished as noted by the two 0DR's discussed above. Therefore, the concern that the drawing revision could

 .cause problems if not followed properly is substantiate The licensee has _ agreed to perform an' engineering review to examine the

_ phase oriented protective relaying for proper electrical connection Note: The inspector was advised on July 7,1988 that the engineering review'had been completed and no other discrepancies were identifie . Exit Interview The inspection scope and results were sumarized on May 19, 1988, with those persons indicated in Paragraph-1. The inspector described the areas-inspected and discussed in detail the ' inspection results. Dissenting coments were not received from the license . }}