ML20203C237

Summary of 990121 Meeting with Illinois Power Company in Rockville,Maryland Re Proposed Changes to Degraded Voltage Relay Setpoints as Described in License Amend Submittal .List of Meeting Participants & Meeting Handouts Encl

ML20203C237
Person / Time
Site:	Clinton
Issue date:	02/08/1999
From:	Hopkins J NRC (Affiliation Not Assigned)
To:	NRC (Affiliation Not Assigned)
References
TAC-MA4524, NUDOCS 9902110290
Download: ML20203C237 (18)

Text

,

, February 8, 1999 LICENSEE: lilinois Power Company FACILITY: Clinton Power Station

SUMMARY

OF JANUARY 21,1999, DEGRADED VOLTAGE RELAY SETPOINTS MEETING (TAC NO. MA4524)

On January 21,1999, NRC management and staff met in Rockville, Maryland, with representatives of Illinois Power Company (the licensee). The purpose of the meeting was to discuss proposed changes to degraded voltage relay setpoints as described in the license amendment submittal dated January 20,1999. A list of the meeting participants is included as Attachment 1. Copies of the meeting handouts are provided as Attachment 2 and

. Attachment 3. A copy of information sent by facsimile from the licensee to the NRC on January 12,1999 is included as Attachment 4.

The licensee proposes increasing voltage onsite by 5 percent to reduce the number of 480/120 voit regulating transformers that need to be installed and reduce the number of circuit modifications that need to be made to guard against undervoltage in the 120 voit circuits. The voltage increase necessitates changes to the Technical Specification undervoltage relay setpoints as described in the proposed license amendment. The licensee stated that it would like the amendment to be issued following field tests confirming the calculations and 2 weeks before their projected startup date of mid-March. The NRC staff is coordinating its amendment review and onsite inspection activities to provide for an efficient, effective review of the proposal.

Original signed by:

Jon B. Hopkins, Senior Project Manager Project Directorate 111-2 Division of Reactor Projects Ill/IV Office of Nuclear Reactor Regulation Docket No. 50-461 Attachments: 1. List of Meeting Participants

2. Meeting Handout

3. Meeting Handout

4. Facsimile

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cc w/atts: See next page i pQ\ \

DOCUMENT NAME: G:\PD3-3\CLINTON\0121MTS.WPD OFFICE PD3-2:PM 1, E PD3-2:LA E PD3-2:D E ,

NAME JHopkins /jV EBamhill & SRichards #

DATE h/5/99 'I A/f799 9-/ 8 /99 -

OFFICIAL RECORD COPY 110045 9902110290 990208 goa Apocaosoogg+t f.,gpfg:v.

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UNITED STATES g j NUCLEAR REGULATORY COMMISSION WAsMINGToN, D.C. 30ee6 c001 I

February 8, 1999 LICENSEE lilinois Power Company FACILITY: Clinton Power Station l

SUMMARY

OF JANUARY 21,1999, DEGRADED VOLTAGE RELAY SETPOINTS MEETING (TAC NO. MA4524) i On January 21,1999, NRC management and staff met in Rockville, Maryland, with representatives of Illinois Power Company (the licensee). The purpose of the meeting was to discuss proposed changes to degraded voltage relay setpoints as described in the license amendment submittal dated January 20,1999. A list of the meeting participants is included as Attachment 1. Copies of the meeting handouts are provided as Attachment 2 and i Attachment 3. A copy of information sent by facsimile from the licensee to the NRC on January 12,1999 is included as Attachment 4.

The licensee proposes increasing voltage onsite by 5 percent to reduce the number of 480/120 j voit regulating transformers that need to be installed and reduce the number of circuit modifications that need to be made to guard against undervoltage in the 120 volt circuits. The voltage increase necessitates changes to the Technical Specification undervoltage relay '

setpoints as described in the proposed license amendment. The licensee stated that it would  ;

l!ke the amendment to be issued following field tests confirming the calculations and 2 weeks  ;

before their projected startup date of mid-March. The NRC staff is coordinating its amendment review and onsite inspection activities to provide for an efficient, effective review of the proposal.

l

/

s -- J Jon B. Hopkins, Senior roject Manager Project Directorate lll-2 Division of Reactor Projects Ill/IV Office of Nuclear Reactor Regulation Docket No. 50-461

-Attachments: 1. List of Meeting Participants

2. Meeting Handout

3. Meeting Handout

4. Facsimile cc w/atts: See next page

= - ----u- - - - - -- e -- - ,.r- =,- -,

Clinton Power Station, Unit 1 lilinois Power Company -

cc: '

1 John P. McElwain . Illinois Department of Nuclear Safety Senior Vice President Office of Nuclear Facility Safety Clinton Power Station ATTN: Mr. Frank Nizidlek P.O. Box 678 1035 Outer Park Drive Clinton,IL 61727 Spiingfield,IL 62704 Wayne Romberg Josepn V. Sipek Manager Nuclear Station Director- Licensing Engineering Department Clinton Power Station Clinton Power Station P.O. Box 678 P.O. Box 678 Mail Code V020

.Clinton,IL 61727 Clinton,IL 61727 Resident inspector Leah Manning Stetzner )

U.S. Nuclear Regulatory Commission VP, General Counsel & Corp. Secretary RR#3, Box 229 A 500 South 27th Street Clinton,IL 61727 Decatur,IL 62525 i

R. T. Hill Licensing Services Manager l General Electric Company 175 Curtner Avenue, M/C 481

]

San Jose, CA 95125 '

Regional Administrator, Region lli  !

U.S. Nuclear Regulatory Commission

]

801 Warrenville Road Lisle, IL 60532-4351 i

' Chairman of DeWitt County l c/o County Clerk's Office

. DeWitt County Courthouse Clinton,IL 61727 J. W. Blattner Project Manager >

,- Sargent & Lundy Engineers 55 East Monroe Street Chicago,IL 60603 i

~' ~ l DISTRIBUTION FOR

SUMMARY

OF JANUARY 21,1999, MEETING WITH ILLINOIS POWER COMPANY Hard Coov w/atts Docket File PD lll-2 Reading j l- PUBLIC '

GGrant, Rlil

'JHopkins Hard Coov w/Att 1 OGC ACRS E-mail w/Att 1 SCollins (SJC1)

RZimmerman THiltz BBoger EAdensam (EGA1) i SRichards Meeting Participants e

s

- . . - . . . . - - __. _ - -- - - . . - . _ . . - - - . .-_. . .- . ~ .

MEETING ATTENDEES

' NRC AND ILLINOIS POWER COMPANY DEGRADED VOLTAGE RELAY SETPOINTS MEETING JANUARY 21,1999 HRQ J. Hopkins J. Lazevnick S. Richards D. Butler D. Thatcher F. Burrows N. Trehan Illinois Power Comoany J. Sipek R. Phares J. Ray W. Romberg A. Haumann J. Kaczmarek PECO Enerav J.Yacyshyn S. Hutchins t-Attachment 1 c

b

Reassessment of Regulating Transformer Modifications at Clinton Power Station January 21,1999 l

1 i.

IP Reoresentatives:

W. D. Romberg Manager-Degraded Voltage R. F. Phares Manager-Nuclear Safety and Performance Improvement J. V. Sipek Director-Ucensing J. F. Kaczmarek Ucensing Engineer J.L. Ray TechnicalLead-Degraded Voltage A.B.Haumann Technical Manager-Degraded Voltage

[

i.

f i

1 ILLIN915 P4sWER Attachment 2

l Aaenda j l

Introduction J. V. Sipek ,

1 Reassessment of Regulating W.D.Rombeg Transformer Modifications

- Plant Configuration Changes Technical Specification Changes J. F. Kaczmarek

- Supporting Calculations Evaluation of Potential for W.D.Rombeg Overvoltage Conclusion R. F. Phares I

1.

l ILLIN9ES P47WER

Introduction l -

Licensee Event Report 94-005 i - Recognized Weakness in Circuit Modeling Below 480-Volt Level Interim Actions Established

- New Degraded Voltage Relays Purchased

- New Relays Installed / License Amendment 110 issued in Early 1997 Full Scope of Modifications Determined

- Static VAR Compensators for RAT and ERAT ERAT Replaced with Load Tap Changer (RAT to be Replaced in the Future)

- Regulating Transformers to be Installed for Susceptible 120-Volt Circuits Progress / Current Status

- SVCs Installed ERAT LTC installed -

- Regulating Transformer Modifications Underway but Reassessed l

1 ILLIN9fS P(sWER

Reassessment of Regulatina Transformer Modifications Challenges Encountered During Design and Installation of Regulating Transformers Revised Approach Adopted

- Circuits Modified (Cable Rerouted, Parallel Cable l installed, etc.) l

- Raise Tap Setting on RAT

- Fewer Regulating Transformers Required

- Regulating Effect of SVC Accommodates Expected Offsite Voltage Range (Figure 1)

- Revised Degraded Voltage Relay Setpoints Requires Revision of CPS Technical Specifications

- Evaluation of Potential for Overvoltage I '

ILLIN915 PbWER

Technical Specification Channes Technical Specification Changes Required

-- Changes to Allowable Values Specified for Degraded Voltage Relay Setpoints

- Changes to Minimum Required Steady-State Bus Voltage Specified in Surveillance Requirements for Standby Emergency Diesel Generators Setpoint Changes Based on Calculational Methodology Previously Reviewed by NRC (for Amendment 110)

Status of Calculations Timeframe for NRC Review and Approval e

ILLIN915 P4rWER

I.-..- - -.

!l i[ Overvoltaae Evaluation l

l

• Potential for Overvoltage at Higher RAT Tap Setting l - Not a Concern for ERAT I

, - Potential for Overvoltage Dependent on all of the 1 Following:

i !.

• SVC Trip i ,

• Offsite Source (Grid) Voltage (Plant Running or

!( Not Running) High

• insufficient Balance of Plant Loading on RAT i,

i

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Potential Minimized via Procedural Controls

- Transfer Division 1 or 2,4.16 kV Bus to ERAT

- Monitor RAT Loading ILLINSIS P(WWER

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Pickup setpoint 4101

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i . .

j e Degraded Voltage Modifications (Original / Planned Scope)

SVCs '

! - . ERAT LTC l, - Regulating Transformers (480 V to 120-V)

, . Numberin Division 1 = 5

! = Numberin Division 2 = 5 .

. Numberin Division 3 = 1 -

! e Approximately 70 circuits afected '

. Design, Scheduling, Tedinical issues Encountered That Were Not i Previously Anticipated and Escalated Construction Costs l .

j- . Partial implementation of Scope and Regulating Transformer Installation i'

2 Number in Divisio.n 1 = 2 Number in Division 2 = 1

- Numberin Division 3 = 1

- Interim Configuration (Intend to Complete in RF-7)

- Approximately 27 Circuits Addressed

. Regulating Transformer .

i

. Reduced Voltage Drop e Raise RAT Tap by 5% (One Position)

- Allows SVC to Operate in Intended Range e Raise Second Level Undervoltage Relay Setpoints and Allowable Values

- 5% Boost

- No Significant Change in Probability of Transfer to Diesel Generators

- ENect of RAT SVC Trip

. Some increase in Potential for Overvoltage to Some Circuits in the Event of an SVC Trip at Maximum Expected OWsite Voltage

. Compensatory Measures / Contingencies

- Maintain BOP Loads / Busses on RAT

- Consider Transferring Div.1 or 2 to ERAT on Loss or Redudion of BOP Loads / Busses from RAT.-

Post it" brand fax transmittai memo 7671 aet psons e 1

• Jor4 Horgids- *ies Etwoop US N RC oWFN MtNots Powet

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Attachment 4 rn. M s-tS C6

l

. . Degraded Voltage Modifications (Original / Planned Scope)

SVCs .;

- ERAT LTC'

- Regulating Transformers (480 V to 120-V)

. Numberin Division 1 = 5

. Numberin Division 2 = 5

< . Numberin Division 3 = 1

. e Approximately 70 circuits affected

. Design, Scheduling, Technical lasues Encountered That Were Not Previously Anticipated and Escalated Construction Costs 2

Y - .

l . Partial implementation of Scope and Regulating Transformer Installation Number in Divisio.n 1 = 2.

Number in Division 2 = 1 Numberin Division 3 = 1

- Interim Configuration (Intend to Complete in RF-7)

- Approximately 27 Circuits Addressed

. Regulating Transformer

. Reduced Voltage Drop

. Raise RAT Tap by 5% (One Position)

- Allows SVC to Operate in Intended Range

. Raise Second Level Undervoltage Relay Satpoints and Allowable Values

- 5% Boost .

- No Significant Change in Probability of Transfer to Diesel Generators

- Effect of RAT SVC Trip i

. Some increase in Potential for Overvoltage to Some Circuits in the Event of an SVC Trip at Maximum Expected Offsite Voltage

. Compensatory Measures / Contingencies Maintain BOP Loads / Busses on RAT 4

- Consider Transferring Div.1 or 2 to ERAT on Loss or Reduction of l i

BOP Loads / Busses from RAT.-

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Post-it' brand tax transmittal memn 7671 * * >=eas

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USNRC OWFN T u.tw ois Po wt K

• N3scTs *ENess-stal n4*e Attachment 4 wa s '=; ,,gg g

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February 8, 1999 LICENSEE: Illinois Power Company

. FACILITY: Clinton Power Station

SUMMARY

OF JANUARY 21,1999, DEGRADED VOLTAGE RELAY SETPOINTS MEETING (TAC NO. MA4524) t On January 21,1999, NRC management and staff met in Rockville, Maryland, with representatives of Illinois Power Company (the licensee). The purpose of the meeting was to  :'

- discuss proposed changes to degraded voltage relay setpoints as described in the license amendment submittal dated January 20,1999. A list of the meeting participants is included as Attachment 1. Copies of the meeting handouts are provided as Attachment 2 and Attachment 3. A copy of information sent by facsimile from the licensee to the NRC on January  ;

12,1999 is included as Attachment 4.

The licensee proposes increasing voltage onsite by 5 percent to reduce the number of 480/120 volt regulating transformers that need to be installed and reduce the number of circuit 1 modifications that need to be made to guard against undervoltage in the 120 volt circuits. The voltage increase necessitates changes to the Technical Specification undervoltage relay setpoints as described in the proposed license amendment. The licensee stated that it would like the amendment to be issued following field tests confirming the calculations and 2 weeks before their projected startup date 'of mid-March. The NRC staff is coordinating its amendment review and onsite inspection activities to provide for an efficient, effective review of the proposal.

Original signed by:

Jon B. Hopkins, Senior Project Manager Project Directorate 111-2 Division of Reactor Projects lil/IV Office of Nuclear Reactor Regulation Docket No. 50-461 Attachments: 1. List of Meeting Participants

2. Meeting Handout

3. Meeting Handout

4. Facsimile cc w/atts: See next page DOCUMENT NAME: G:\PD3-3\CLINTON\0121MTS.WPD OFFICE PD3-2:PM ,, E PD3-2:LA E PD3-2:D E ,

NAME JHopkins /F EBamnill W SRichards #

DATE b / 5/99 '"ll A/f/99 9-/ B /99 OFFICIAL RECORD COPY i

o

. -