ML17349A201

Summary of 920109 Meeting in Atlanta to Allow Licensee to Make Presentation on Status of New Load Sequencers & on Instrument Setpoints Program.List of Attendees Encl

ML17349A201
Person / Time
Site:	Turkey Point
Issue date:	04/22/1992
From:	Reyes L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	Goldberg J FLORIDA POWER & LIGHT CO.
References
NUDOCS 9205120107
Download: ML17349A201 (38)

Text

APR 2 2 19S2 Docket Nos. 50-250, 50-251 License Nos.

DPR-31, DPR-41 Florida Power and Light Company ATTN:

Mr. J.

H. Goldberg President

- Nuclear Division P. 0.

Box 14000 Juno

Beach, FL 33408-0420 Gentlemen:

SUBJECT:

MEETING TO DISCUSS NEW LOAD SE(UENCERS AND INSTRUMENT SETPOINTS This letter refers to the meeting conducted at your request at the NRC Region II offices in Atlanta on January 9,

1992.

The purpose of the meeting was to allow the licensee to make a presentation on the status of the new load sequencers and on the instrument setpoints program.

It is our opinion that this meeting was beneficial and provided a better understanding of the issues and,their current status.

In accordance with Section 2.790 of the NRC's "Rules of Practice,"

Part 1,

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

Should you have any questions concerning this letter, please let us know.

Sincerely, Original signed by Luis A. Reyes, Director Division of Reactor Projects

Enclosures:

1.

List of Attendees 2.

Presentation Summary cc w/encls:.

K. N. Harris, Sr. Vice President Nuclear Operations, Florida Power and Light Co.

P. 0.

Box 14000 Juno Beach, FL 33408 cc w/encls cont'd:

See page 2

9205l20107 920422 PDR ADOCK 05000250 P

PDR

Florida Power 5 Light Company cc w/encls cont'd:

R.

E. Grazio, Director Nuclear Licensing Florida Power and Light Co.

P. 0.

Box 14000 Juno

Beach, FL 33408-0420 T. F. Plunkett Site Vice President Turkey Point Nuclear Plant P. 0.

Box 029100 Miami, FL 33102 L.

W. Pearce Plant General Manager Turkey Point Nuclear Plant P. 0.

Box 029100

Miami, FL 33102 T. V. Abbatiello Site guality Manager Turkey Point Nuclear Plant P. 0.

Box 029100 Miami, FL 33102 E. J.

Weinkam Licensing Nanager Turkey Point Nuclear Plant P. 0.

Box 029100 Miami, FL 33102 Harold F. Reis, Esq.

Newman and Holtzinger, P.C.

1615 L Street, NW Washington, D. C.

20036 John T. Butler, Esq.

Steel, Hector and Davis 4000 Southeast Financial Center Miami, FL 33131-2398 Attorney General Department of Legal Affairs The Capitol Tallahassee, FL 32304 cc w/encls cont'd:

See page 3

APR 22 199'

Florida Power 5 Light Company cc w/encls cont'd:

Jacob Daniel Nash Office of Radiation Control Department of Health and Rehabilitative Services 1317 Winewood Boulevard Tallahassee, FL 32399-0700 Jack Shreve Public Counsel Office of the Public Counsel c/o The Florida Lesgislature 111 West Madison Ave.,

Room 812 Tallahassee, FL 32399-1400 3

APR 2'8 19$ $

Administrator Department of Environmental Regulation Power Plant Siting Section State of Florida 2600 Blair Stone Road Tallahassee, FL

,32301 Robert G.

Nave, Director Emergency Management Department of Community Affairs 2740 Centerview Drive Tallahassee, FL 32399-2100 Joaquin Avino County Manager of Metropolitan Dade County 111 NW 1st Street, 29th Floor Miami, FL 33128 bcc w/encl:

L. Raghavan, NRR J.

Johnson, RII K. Landis, RII Document Control Desk Ross Butcher, Sr. Resident Inspector U.S. Nuclear Regulatory Commission P. 0.

Box 1448 Homestead, FL 33090 RII:DRP RSc in 04jp~2 RI P

KLa dis 04/ZV/92 RII:D P MSinkul e 04/g/92

NRC ENCLOSURE I LIST OF ATTENDEES M. V. Sinkule, Chief, Reactor Projects Branch 2, Division of Reactor Projects (DRP), Region II (RII)

T. A. Peebles, Chief, Operations Branch, Division of Reactor Safety (DRS), RII K. D. Landis, Chief, Reactor Projects Section 2B, DRP, RII R. V. Crlenjak, Chief Operational Programs

Section, DRS, RII M. B. Shymlock, Chief, Plant Systems

Section, DRS, RII R.

C. Butcher, Senior Resident Inspector, Turkey Point, DRP, RII M. T. Janus, Project Engineer Intern, DRP, RII FPL T. J.

E. J.

D. L.

W. A.

J.

E.

Luke, Acting Site Engineering Manager Weinkam, Licensing Manager Smith, Discipline Chiefs and Staff Production Supervisor, FPL Busch, Senior Electrical Staff Engineer, FPL Knorr, Licensing Engineer

ENCLOSURE 2

FLORlDA POWER & LlGHT April3, 2992 Introduction.........E. J. Weinkam Setpoints Program - D. L. Smith Sequencer Update - Nf. A. Busch

TURKEYPOINT INSTRUMENTSETPOINT PROGRAM

DEEINITIONS DEVICE DEEINITIONS/EXAMPLES

1) Instrument Loops 20 ma Instrument Loops

- Contain Transmiffers, Bistables, Indicators, etc.

- May Have Input to Instrument Cabinets, e.g., RPS, or FSFAS

2) protective Relays

- Relays 1VithAdjustable Settings, e.g., overcurrent, undervoltage or underfrequency

- Have Characteristic Curves

8) process Switches

- Actuate at a Given Point

- Measure flow, level, pressure

- Single Purpose Devices FLEA12

PRIORITIZATIONOF SETPOINT DOCUMENTATION

1) Protective Relays - Complete 8/92

2) Instruments - Currentlyin Progress

~ Instrument Loops

~ Process Switches

9) Devices Presently Included on Drawings

- Plan June '99 for Decision to put in List Format

~ Timing Relays

~ Safety Reliefs

~ Pneumatic Devices

4) Others - No Setpoint Drawing Required

~ Area Radiation

~ Fire Detectors

PTN SAFETYRELATED INSTRUMENTSETPOINT PROGRAM

ORIGINAL INSTRUMENTSETPOINTS

~ Determined by AE, NSSS or Vendor (appear in many documents)

~ Provided In Process Units (gal., PSIA, etc.)

~ Scaling and Calibration Units TypicallyDone by Plants (volts, ma, etc.)

PRIOR ACTIONS FPL SETPOINT METHODOLOGYSTANDARD ISSUED 8/88

~ Revision 0 Endorsed Square Root Of The Sum Of The Squares

~ Revision 2 Endorses ISA S67.04 Methodology PTN DESIGN BASIS RECONSTITUTION

~ Westinghouse Performed RPS/ESFAS Settings To New Methodology

~ New Tech Specs With "6 Column Methodology"

~ New Methodology Did Not Show Past Setpoints Inadequate PTN INDEPENDENTASSESSMENT 0 Performed August 1991

MAINPROGRAM POINTS

1. Provide Documentation ofSetpoints for Instruments

2. Safety Related Instrument Setpoint Calculations/Methodology

PROVIDE DOCUMENTATION OF SETPOINTS FOR INSTRUMENTATION

1) Gather Existing Instrument Setpoints From Existing Documents

2) Create An Instrument Setpoint Document

3) Populate The Document With Information Gathered

4) WillBe Done For Non-Safety Instruments Also

MAGNITUDEOF EFFORT SETPOINT DRAWINGCREATION

~ Form Team Combined of 1 Person Each From Engineering, Tech Staff, and Maintenance

~ Provide Schedule for Remaining Setpoints by July '82

Instrument Setpoint Document Schedule Task Name

Start, Date End Date 91 92 Dec Jan Feb 2

2 3

Mar Apr May Jun Jul 1

1 1

1 Obtain Passport Approval Investigate Passp.

Capability Decide on Passport or dBase Determine Format

& Content Obtain Ebasco Program Make Field Changes Change Report Format Form Team:

Eng, Tech, Maint.

Prioritize Data Gathering Data Gathering Report Qtrly. Show Progress Report Qrtly. Show Progress Assess Effectiveness of Work Complete Complete Complete Complete Complete Complete Complete Complete Complete 15-Jan-92 1-Jun-92 Complete 1-Jun-92 15-Jun-92 15-Jun-92 1-Jul-92

~

~

~ ~ ~ ~ ~ ~ ~ ~ ~

Rev. 3/31/92

SAFETYRELATED SETPOINT CALCULATIONS/

METHODOLOGY

1. Setpoint Standard Rev 2 Issued

2. Gather Calculations

3. Review For Adequacy

4. Enhance or Re-create as Required

MAGNITUDEOF EFFORT SETPOINT CALCULATIONS/METHODOLOGY h

~ 7 Manyears Plus $300,000 For Required Support NSSS/AE

~ To Be Completed December 1893

SETPOINT CALCULATION SCHEDULE JAN FEB AR APR MAY JUN JUL AUG SEP ocr NOV JAN DEC FEB MAR APR MAY JUL SEP JUN AUG OCT NOV DEC GATHER EXISTING CALCS FORM OVERALLFPL TEAM PROVIDE SPECIFIC IMPROVEMENTPLANON CALCULATIONBASIS IMPROVE CALCULATIONS INDEPENDENTASSESSMENT FLlASS

TURKEYPOINT UNITS 3 8c 4 FAILUREOF LOADSEQUENCER AUTO-TESTRELAY

~ Background

~ Description ofthe Event

~ Short Term Actions Taken

~ investigations of the Failure 8 Results

~ Long Term Corrective Actions

BACKGROUND

~ Emergency Load Sequencers Implemented using Programmable Logic Controllers

~ Safety Functionis to Load Required Engineered Safety Feature Equipment in the Event ofa Safety Injection Signal and/or Loss of Offsite Power

~Automatic Test Feature-Normal Operating Mode

EVENTDESCRIPTION

~ On December 10, 1991, During A Routine System Walkdown, Sequencer 4A was Found to have Dropped Out ofAuto-Tesf.

~ Seguencer 4A was Declared Inoperable and, in Accordance with Technical Specification Action Statements, Unit4 was Brought to Hot Standby Conditions within 6 Hours, and then Hot Shutdown within the Following 6 Hours.

~ Troubleshooting Identified an Electromagnetic Relay on a Tesf Circuif Oufpuf Card which Failed in the Contact Closed State.

~ The Card was Replaced and fhe 4A Sequencer was Returned to Service.

SHORT TERM CORRECTIVE ACTION

~ Test Selector Switch Administratively Controlled in the OffPosition

~ Manual Testing is Performed Once Every 30 Days

~ Visual Inspections ofLocal Annunciators and Indicating Lights were Instituted on an 8 and 24 Hour Basis

INVESTIGATIONS

~ Root Cause Analysis - Metal Migration on the Relay Contacts Due to Inrush Currents Resulting From the Capacitive Effects ofLong Field Cables.

~ Failure Modes and Effects Analysis - No Other Significant Nodes ofFailure. Suggested Methods for Diagnostic and Test Enhancements.

~ Test Frequency Significance Relative to Published PRA Results - 30 Day Manual Testis Consistent with Published Results. Auto Test on a t Hour Frequency Reduces Probability of Core Melt - 2%

125V DC 125V DC UJ Q3 O

CI LU EL COMt ON-ENTS TEST OUTPUT CARD COMPONENTS PROCESS INPUT CARD TO PROCESS OUTPUTS SEQUENCER INPUT CARD TEST CIRCUIT

- SIMPLIFIED-PROCESSOR

500 TURKEY POINT SEQUENCER INRUSH CURRENT ON OW RELAYS 400 300 z

~~200 100 4

5 6

7 Thousandths TIMEINSECONDS

a I

106 SENSITIVITYOF ESTIMATED MEAN CDF TO SEQUENCER TEST INTERVAL 90 DAY I-z LLI ~ 104 z 0 LU CL (f) c( z CQ0

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4S DAY DAY oro 60 SAY o{o ro ~ ~ ~ ~ ~

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1 HOUR.'AY 7 l3AY 98 1

3 10 30 100 300 1,000 3,000 10,000 SEQUENCER TEST INTERVAL (HOURS)

LONG TERM CORRECTIVE ACTION

~ Engineering Packages to be Completed Prior to Refueling Outages

~ Change Test Circuit Power Supply.

Sequencer Remains Functional ifRelay Fails.

~ Resistors to Limitinrush Current on DC Relays to Extend Relay Life

~ Reduce Autotest Frequency from Once Every 3 Minutes to Once an Hour to Extend Relay Life

~ Diagnostics and Test Enhancements

SUMMARY

~ Current

- Determine Root Cause

- Eliminate Failure Mode by Disabling Relay Circuit

- Performing Surveillance Consistent with PRA

~ Future

- Conservative Design Change Reinstating Auto-Test

- Restore Original Design Intent

- Enhanc'e Diagnostic Capabilities

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