ML20198T173

Provides Summary of Meeting on 971022 W/Duke Energy Corp at NRC Region II Ofc Re C/As to Resolve Failures of Electrical Circuitry Optical Isolators Which Resulted in Reactor Trips. List of Meeting Attendees & Presentation Handout Encl

ML20198T173
Person / Time
Site:	Catawba
Issue date:	11/04/1997
From:	Christensen H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	Gordon Peterson DUKE POWER CO.
References
NUDOCS 9711140213
Download: ML20198T173 (20)

Text

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1.

November 4. 1997 Duke Energy Corporation ATTN: Mr. G. R. Peterson Site Vice President Catawba Site 4800 Concord Road York. SC 29745-9635

SUBJECT:

MEETING

SUMMARY

- CATAWBA - TO DISCUSS CORRECTIVE ACTIONS TO RESOLVE ELECTRICAL CIRCUITRY OPTICAL ISOLATORS FAILURES

Dear Mr. Peterson:

This refers to the meeting conducted at your request at the NRC Region II Office on October 22, 1997, at 10:00 a.m..

The purpose of the meeting was to discuss your corrective actions to resolve the failures of the electrical circuitry optical isolators which resulted in reactor trips.

A list of attendees and a copy of your presentation handout are enclosed.

It is our opinion that this meeting was beneficial in that it provided the NRC staff with a good overview of your planned corrective actions to resolve the optical isolator failures.

1 In accordance with Section 2.790 of the NRC's " Rule of Practice." Part 2.

Title 10 Code of Federal Regulations, a co)y of this letter and its enclosures will be placed in the NRC Public Document Room.

Should you have any questions concerning this meeting, please contact H. Christensen at (404) 562-4605.

Sincerely.

Original signed by George A. Belisle for:

Harold 0.

Christensen. Chief Engineering Branch Division of Reactor Safety Docket Nos 50-413. 50-414 License Nos. NPF-35. NPF-52

Enclosures:

1.

List of Attendees 2.

Presentation Summary T

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M. S. Kitlan North Carolina Electric Regulatory Compliance Manager Membership Corporation Duke Energy Corporation P. O. Box 2/306 4800 Concord Road Raleigh. NC 27611 York. SC 29745 9635 Karen E. Long Robert P. Gruber Assistant Attorney General Executive Director N. C. Department of Justice Public Staff - NCUC P. O. Box 629 P. O. Box 29520 Raleigh NC 27602 Raleigh. NL 27626-0520 Saluda River Electric Paul R. Newton Cooperative. Inc.

Legal Department (PB05E)

P. O. Box 929 Duke Energy Cor) oration Laurens. SC 29360 422 South Churc1 Street Charlotte NC 28242-0001 Peter R. Harden IV Account Sales Manager J. M. McCarry. 111. Esq.

Power Systems Field Sales Winston and Strawn Westinghouie Electric Corporation 1400 L Street. NW P. O. Box 7288 Washington, D. C.

20005 Charlotte. NC 28241 rth Carol 1na MPA-1 County Manager of York County te 600 York County Courthouse

0. Box 29513 York. SC 29745 Lleigh. NC 27626-0513 Piedmont Municipal Power Agency Max Batavia. Chief 121 Village Drive Bureau of Radiological Health Greer. SC 29651 S, C. Department of Health and Environmental Control G, A. Copp 2600 Bull Street Licensing - EC050 Columbia SC 29201 Ouke Energy Corporation P. O. Box 1007 Richard P. Wilson. Esq.

Charlotte. NC 28201-1007 Assistant Attorney General S. C. Attorney General's Office T. Richard Puryear P. O. Box 11549 Owners Group Columbia, SC 29?ll North Carolina Electric Membership Corporation Michael Hirsch 4800 Concord Road Federal Emergency Mgmt. Agency York. SC 29745 500 C Street. Sw. Room 840 Washington, D. C.

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L]ST OF ATTENDEES Date Power Company T. Bradberry, Engineer Catawba Nuclear Plant (CNP)

5. Brown, Civil. Electrical, and Nuclear Engineering Manager. CNP M. Callaway. Engineer CNP J. Forbes. Engineering Manager, CNP N. Holmes. Engineer. CNP M. Kitlan, Regulatory Compliance. CNP B. Queenan. 1&C Engineering Supervisor, CNP EC J. Jaudon, Director. Division of Reactor Safety (DRS), Ril H. Christensen, Chief. Engineering Branch (EB). DRS. Rll P. Fillion, Reactor Inspector EB, DRS M. Miller. Reactor Inspector, EB. DRS C. Ogle, Chief, Reactor Project Branch, Division of Reactor Projects, Rll l

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• P6 wen A Deke Eney Campmy

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5 a INTRODUCTION i l m BACKGROUND u FEBRUARY 1995 TO JUNE 1997 i a JUNE 1997 TO NOW - PRESENT STATE m FUTURE ACTIONS a

SUMMARY

I l B B i Q Q lj l J B !l l B B B B B.J B B 1 October 22,1997 Catawba Nuclear Station 4 h

Duke

1. Power.

Introduction A Dale Ewgy Co~rpery l i s Serious about this! a Adequacy of root cause analysis? s Adequacy of corrective actions? a Present state: How are we ensuring no more trips ? m Future state: What are our long term plans ? B B Q O i J B Bt3BQ JBB October 22,1997 Catawba Nuclear Station

l Duke

1. Power.

Catawba Organ.ization A rnkr % Cew m i Gary Peterson Site Vice President-l I I Jeff Forbes M ary Birch l Manager of Engineering Manager of Safety Assurance zScott Brown _ Mike 'Killan j Manager of Civil, Electrical, Nuclear Engineering Manager of Regulatory Compliance B Bob Queenan I&C Engineering Supervisor I B I 13 Tim Bradberry, Engineer l Minh Callaw'ay, Engineer I_J i Nicole Holmes, Engineer ~ j E i BBBB3JBB October 22,1997 Catawba Nuclear Station l

L R Duke C# Power. Bac'KgrOUnd l A Dehe Ewy Gmpary t a Digital Optical isolators are Separation Devices na 1 E-to-Non 1 E or Train-to-Train 4 a Entire Device is Safety Related QA1 j u 5700 Total -- 900 Control,4800 indication i i i Ogia i ~$O E i

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=pg q OK 40 e i Q 6 inches a I 3 BBBBBJES October 22,1997 Catawba Nuclear Station 4

M Duke C# Power. Backg round A Duke Ewgy Compey a Specifications a Vendor Selection a Procurement a Electromax Design a Electromax Manufacture a Duke Receipt E l B l 0 G l B BBBBBi ER 1 October 22,1997 Catawba Nuclear Station

Duke

1. Power _

Bac<g round - Emax Design A Duke Ewy Co~rpery { r non-1 E !E Power Power 1 .e m u O g i i B B Control Load O Q J y Simple Reliable Design y teammata October 22,1997 Catawba Nuclear Station i t

I \\ D Duke EdPower-a v.1,m m 4 h a BACKGROUND a FEBRUARY 1995 TO JUNE 1997 m JUNE 1997 TO NOW - PRESENT STATE a FUTURE ACTIONS l u

SUMMARY

B t 5 0 Q .] i R B B B B B ;J B B October 22,1997 Catawba Nuclear Station I l

Duke

1. Power.

February 1995 to June 1997 a va,z,c m a S/G 2B MSIV closure on 2/21/95 m Cause Analysis J Extensive root cause analysis done a All DOI components examined J Electrolytic capacitor aging a Corrective Actions 3 J Dols with new capacitors B J Replaced 432 Dols B J Established PM program O J Started a modification O J B B B B B B 'J B B October 22,1997 Catawba Nr .ar Station 1-m--

I b Duke 1 C# Power February 1995 to June ~ 997 i l .4o+ % m l Control DOI Failure Rate (population 900) 1 a Modification 3.023 J DOI replacement 25 -- reduced urgency 2.5ms 20 -- J Complex control circuit design 2.00 % 8 15 J 50.59 concerns j5 1.5ms 5 J DOI reliability 4.6 failtres/ year I reduced urgency 0.51%/yaar 1.0mb B 198 y3ars MlBF G 5 0.5m6 Q G o-O.00 % 1995 1996 1997 a j aaaaaaaa j October 22.1997 Catawba FJuclear Statron

DDnske EdPower-a o.u a,, c,m a BACKGROUND t a FEBRUARY 1995 TO JUNE 1997 a JUNE 1997 TO NOW - PRESENT STATE t r FUTURE ACTIONS l m

SUMMARY

a i G l B r; i3 J i i eBBBBUBE October 22.1997 Catawba Nuclear Statbt [

I Duke

1. Power July 1997 to Present A Duke Ewy Cmpary i

a S/G 2D MSIV closure on 7/26/97 J Found failed DOI a S/G 2D MSIV closure on 8/17/97 a Found erratically operating DOI a Failure Analysis a Analysis results after 2nd trip 9 J Resistor problem B J Not related to 1995 capacitor prob!em E 13 4 a -J E S E E E E iJ E S l October 22,1997 Catawba Nuclear Station i

l Duke Fa. lure Analys.is

1. Power _

i A Duke Duerg Company a Performance improvement inc did work u Random Manufacturing Failures l J Chemical contamination on film i J Physical damage to film 1 m Additional Long-term Degradation i J Coating Problem J Slower than other failures g a All Detectable by Test t J Slow degradation B i D i g J E GREGOJBB October 22,1997 Catawba Nuclear Station f 2 i \\ i

E DE#ke F# Power _ Testing

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i a MSIV Dols a Weekly output voltage test J Weekly input current test a Critical Energized Loaded Dols a Weekly output voltage test a Weekly input current test 3 i a Critical Energized Unioeded Dols B a Output voltage test done once E a Future input current test O O a No degradation detected to date .J B BBBBBUBE Octcber 22,1997 Catawba Nuclear Station

i b Duke EdPower. A Duke Ewgy Compery i i a BACKGROUND s FEBRUARY 1995 TO JUNE 1997 r a JUNE 1997 TO NOW - PRESENT STATE l a FUTURE ACTIONS a

SUMMARY

I B 3 T3 G l d O BBBBBdBB October 22,1997 Catawba Nuclear Station

M Duke C# Power _ Future Actions a o.u s, c,r, a Modify the MSIV Circuitry s Post 1988, Critical, Energized Dols a Post 1988, Critical, Deenergized Dols a Failure Monitoring B s PM Replacement Program g l B Q h j B i BBBBBJBR l October 22,1997 Catawba Nuclear Stat' i

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E Duke EdPower. i A DukeEwZ7 'mP*c1 I C i I i i I

SUMMARY

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