ML20045H121

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Summary of 930714 Meeting W/Util Re Offsite Power Supplies, Recent Switchyard Events & Corrective Actions
ML20045H121
Person / Time
Site: Crystal River 
Issue date: 07/14/1993
From: Silver H
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 9307190086
Download: ML20045H121 (39)
v • d • e


Text

-

July 14, 1993 Docket No. 50-302 LICENSEE:

FLORIDA POWER CORPORATION (FPC)

FACILITY:

CRYSTAL RIVER UNIT 3

SUBJECT:

SUMMARY

OF MEETING ON JUNE 16, 1993, REGARDING RECENT POST-STORM SWITCHYARD EVENTS AT CRYSTAL RIVER UNIT 3 Representatives of FPC met with members of the staff on June 16, 1993.

Topics discussed included the adequacy of the Crystal River Unit 3 offsite power supplies, recent switchyard events, and corrective actions. The meeting was prompted by four reportable events involving degraded offsite power between March 13 and April 8, 1993, as discussed in NRC Inspection Report 50-302/93-11. contains a list of attendees. consists of the handouts distributed at the meeting by FPC.

A management review team was formed by FPC to review the events.

Recommendations made by the review team include, in part, enhancing the nuclear staff technical knowledge of switchyard design and operations, changing interface procedures between Crystal River Unit 3 and other FPC personnel, precluding switchyard work on shutdown cooling-related power during outages, and reviewing guidelines for determining the level of detail required in work instructions for adequacy.

It was agreed that the licensee will keep the Resident Inspectors informed of the continuing corrective actions associated with the switchyard events.

(Original Signed By)

Harley Silver, Project Manager Project Directorate 11-2 Division of Reactor Projects - I/II

Enclosures:

As stated cc w/ enclosures:

See next page Distribution - See next page OFFICE LA:PDII-2 PM:PDI (22, D:PDIl_2

70. PD02-NAME ETana HSdkY HBe M >

R(Ro m b DATE 07/ l4/93 O h /93 07/ N /93 7 //d/9$

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OFFICIAL RECORD COPY - DOCUMENT NAME:C\\ AUTOS \\WPDOCS\\ CRYS"AL\\ MING. SUM M10 RLE CEPHB1 CWY D

9307190006 930714 PDR ADOCK 05000302 P

PDR L

Memorandum Dated July 14, 1993

. Ilj stribution-Docket File

RDII-2 Reading File

  • T. Murley/F. Miraglia

- J. Partlow S. Varga G. Lainas H. Berkow E. Tana H. Silver

  • K. Landis,RII OGC E. Jordan C. Berlinger R. Croteau
  • S. Saba, 7-E-14 M. Shymlock, RII P. Gill, 7-E-4 ACRS (10)

L. Plisco, EDO M. Sinkule, RII*

  • Meeting handout is enclosed.

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Memorandum Dated July 14, 1993 Distribution Docket File

RDII-2 Reading File

  • T. Murley/F. Miraglia J. Partlow S. Varga G. Lainas H. Berkow E. Tana H. Silver
  • K. Landis,RII OGC E. Jordan C. Berlinger R. Croteau
  • S. Saba, 7-E-14 M. Shymlock, RII P. Gill, 7-E-4 ACRS (10)

L. Plisco, E00 M. Sinkule, RII*

  • Meeting handout is enclosed.

)

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July 14, 1993 Docket No. 50-302 LICENSEE:

FLORIDA POWER CORPORATION (FPC)

FACILITY:

CRYSTAL RIVER UNIT 3

SUBJECT:

SUMMARY

OF MEETING ON JUNE 16, 1993, REGARDING RECENT POST-STORM SWITCHYARD EVENTS AT CRYSTAL RIVER UNIT 3 Representatives of FPC met with members of the staff on June 16, 1993.

Topics discussed included the adequacy of the Crystal River Unit 3 offsite power supplies, recent switchyard events, and corrective actions.

The meeting was q

prompted by four reportable events involving degraded offsite power between March 13.and April 8, 1993, as discussed in NRC Inspection Report 50-302/93-11. contains a list of attendees. consists of the handouts distributed at the meeting by FPC.

A management review team was formed by FPC to review the events.

Recommendations made by the review team include, in part, enhancing the nuclear staff technical knowledge of switchyard design and operations, j

changing interface procedures between Crystal River Unit 3 and other FPC personnel, precluding switchyard work on shutdown cooling-related power during outages, and reviewing guidelines for determining the level of detail required in work instructions for adequacy.

It was agreed that the licensee will keep the Resident Inspectors informed of the continuing corrective actions associated with the switchyard events.

(Original Signed By)

Harley Silver, Project Manager Project Directorate 11-2 Division of Reactor Projects - 1/11

Enclosures:

As stated cc w/ enclosures:

See next page Distribution - See next page OFFICE LA:PDII-2 PM:PDl%

D:PDI.(_2

?O %2-l ETana N fW HdfjsY HBh R (f s u k k WE DATE 07/ 14 /93 07 h 93 07/ P /93

'7 //d/9$

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//

OFFICIAL RECORD COPY - DOCUMENT NAME:C\\AU"0S\\WPDOCS\\ CRYS"AL\\ MING. SUM

Mr. Percy M. Beard Crystal River Unit No.3 Florida Power Corporation Generating Plant j

cc:

Mr. Gerald A. Williams Mr. Joe Myers, Director Corporate Counsel Div. of Emergency Preparedness q

Florida Power Corporation Department of Community Affairs MAC-ASA 2740 Centerview Drive P. O. Box 14042 Tallahassee, Florida 32399 St. Petersburg, Florida 33733 Mr. Bruce J. Hickle, Director Chairman Nuclear Plant Operations Board of County Commissioners Florida Power Corporation Citrus County P. O. Box 219-NA-2C 110 North Apopka. Avenue Crystal River, Florida 34423-0219 Inverness, Florida 32650 Mr. Robert B. Borsum Mr. Rolf C. Widell, Director B&W Nuclear Technologies Nuclear Operations Site Support Florida Power Corporation i

1700 Rockville Pike, Suite 525 P.O. Box 219-NA-21 i

Rockville, Maryland 20852 Crystal River, Florida 34423 Regional Administrator, Region 11 l

U. S. Nuclear Regulatory Commission Senior Resident Inspector 101 Marietta Street N.W., Suite 2900 Crystal River Unit 3 Atlanta, Georgia 30323 U.S. Nuclear Regulatory Commission Mr. Bill Passetti 6745 N. Tallahassee Road Office of Radiation Control Crystal River, Florida 34428 Department of Health and Rehabilitative Services Mr. Gary Boldt 1317 Winewood Blvd.

Vice President - Nuclear Tallahassee, Florida 32399-0700 Production Florida Power Corporation Administrator P.O. Box 219-SA-2C Department of Environmental Regulation Crystal River, Florida 34423-0219 Power Plant Siting Section State of Florida 2600 Blair Stone Road Tallahaseee, Florida 32301 Attorney General Department of Legal Affairs The Capitol Tallahassee, Florida 32304

ATTENDEES FPC - NRC MEETING ON JUNE 16,1993 Name Office H. Berkow NRC H. Silver NRC R. Croteau NRC C. Berlinger NRC S. Saba NRC M. Shymlock NRC K. Landis NRC P. Gill NRC G. Boldt FPC B. Hickle FPC J. Terry FPC A. Friend FPC L. Moffatt FPC J. Terry FPC M. Fitzgerald FPC

' Enclosure 2 f

FPC/NRC MEETING SWITCHYARD ISSUES JUNE 16, 1993 Agenda Introduction

System Description

Overview of Chronology Details of Events And Summary of Lessons Learned Questions and Answers FPC - Attendees Gary Boldt Vice President, Nuclear Production Bruce Hickle Director, Nuclear Plant Operations Larry Moffatt Manager, Nuclear Plant Technical Support Jim Terry Manager, Nuclear Plant Systems Engineering i'

M.ike Fitzgerald Supervisor, Nuclear Plant Systems Engineering - Electrical

' Al Friend Nuclear Principal Licensing Engineer

PURPOSE

  • To discuss offsite and onsite AC power supplies to Crystal River Unit 3 and their adequacy during the March 1993 storm To demonstrate the adequancy r

of the existing design i

To discuss lessons learned and areas for improve. ment t

TOPICS SWITCHYARD DESIGN 1

CHRONC' LOGY OF EVENTS (OVERVIEW?

EVENT DETAILS LESSONS LEARNED

  • CONTINUING ACTIONS

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CHRONOLOGY OVERVIEW FRIDAY 3/12 Storm warning message issued for severe thunderstorms, strong / gusty winds, followed by cold wave SATURDAY 3/13 CR 3 declares an UNUSUAL EVENT due to high tide level Storm ends WEDNESDAY 3/17 CR 3 declares a precautionary UNUSUAL EVENT due to reducing switchyard. redundancy

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CHRONOLOGY OVERVIEW MONDAY 3/29 A failed underground cable in the 500kv switchyard results in an interuption of t

the backfeed to CR 3. Both diesels auto L

started and resumed feeding decay heat.

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Offsite power was realigned.to the 230kv yard which remained available throughout L

the event. An UNUSUAL EVENT was declared 1

a'nd exited simultaneously.

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THURSDAY 4/8 i

Personnel error while changing a pilot

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cell in the 500kv switchyard. battery caused interuption of the backfeed to CR 3. The B

- diesel auto started and resumed feeding decay i

heat. Offsite power was realigned to:the.

230kv yard. An UNUSUAL EVENT-was. declared.

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CONTINUING ACTIONS REVIEW SWITCHYARD INSULATOR DESIGN Consider:

Over-insulating

Insulator coatings SWITCHYARD WASHDOWN 1

Consider:

Revisit hotwash systems PM program Outside supplemental crews CABLES Consider:

Separation of AC power from control cables in trenches.

PM program

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t PLANT SYSTEMS 3/4.7.6 FLOOD Pe0TECTf0N LIMITfMG CONDITION FOR OPERATION

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3.7.6.1 Flood protection shall be provided for all safety related

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systems, components and structures when:

a.

The water level of the Gulf of Mexico exceeds 98 feet Plant Datum, at the intake structure, and b.

A Hurricane Warning is in effect.

APeLICABILITY: At all times.

ACTION:

With the water level at the intake structure above elevation 98 feet Plant Datus and with a Hurricane Warning in effect:

/

a.

Close all watertight doors providing flood protection for safety related systmas, components and structures within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, and b.

Se in at least NOT SHUTDOWN within 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />st be in at least -

COLD SHUTDOWN within the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

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$URVEILLANCE REOUTREMENTS 4.7.6.1.1 When a hurricane Watch or Warning is in effect, the dier level at the intake structure shall be detemined to be within the limit by:

a.

Measurement at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> when the water level is below elevation 92 feet Plant Dat a.-

b.

Measursent at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> when the unter level is equal to or above elevation 92 feet Plant Data, and c.

Measursent at least once per 30 minutes when the water level is equal to or above elevation M feet Plant Datum.

4.7.6.1.2 Meteorological forecasts shall be obtained from the National Hurricane Center in Mitat. Florido at least once per 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> when a Hurricane Warning is in effect.

CRYSTAL RIVER. UNIT 3' 3/4 7-19 Amendment %. 8 W

.4e6.

PLANT SYSTRE 3/4.7.5 ULTDeATE ERAT SINK LIMITING M ITION FOR OPERATION 3.7.5.1 The ultunate heat sink shall be OPERABLE with:

A minisman water level at or above elevation 81 fe'et Plant a.

Datum, b.

An inlet water temperature of 196*F. and

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c.

A maxim m elevation of b intake canal bottom of 74 feet Plant Datum.

APfLICABILITY: Moots 1, 2, 3 and 4.

ACTION:

With b water level < 81 feet Plant Datum or the inlet-a.

water temperature > 96*F. be in at least ET STANDBY within 6 l

bours and in COLD SEUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, b.

With b elevation of the intake canal bottom ) 74 feet Plant Data, restore the elevation of the intake canal bottom to 1 74 feet Plant Datum within 90 days or be in at least EDT STANSY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in 00!A 550TDolet within the follow-ing 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVIILLAK E M Ji-Z is 4.7.5.1 The ultimate heat sink shall be determined OPERABLE:

At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the inlet water a.

temperature and water level to be within their limits, and b.

At least ames per 24 months by determining that the maximan elevation of b intake canal bottom is 174 feet Plant Datum.

. CRYSTAL RIVER - UNIT 3 3/4 7-18 h t No.109 L

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Lwnsen EERENCY CLA551FICATION TABLE (Page10of.'s)-

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ACCigEET CSIBIT105:

LOSS OF POWER ns n <*

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Loss of offsite mower CR Loss of feeder breaker:-

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lighting. loss of RC a 15 minutes nn nes aw mm> m' momssfam n.

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> 15 minutes no Efu > 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> Itohting loss of RC ire

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s FLORIDA POWER CORPORATION CRYSTAL RIVER ENERGY. COMPLEX SWITCHYARD OPERATION JUNE 16, 1993 AGENDA

  • NORMAL OPERATION OF SWITCHYARD DURING PLANNED OUTAGES
  • RECENT MODIFICATIONS

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4 230 kV SWITCHYARD PLANT-INPUTS TO 230 kV SWITCHYARD

  • CRYSTAL RIVER UNIT 1

~

  • CRYSTAL RIVER. UNIT 2-
  • CRYSTAL RIVER UNIT 4

. TRANSMISSION TIES TO 230 kV SWITCHYARD

  • . CRYSTAL. RIVER EAST via breakers 1155 & 1156
  • HOLDER via breakers 1158 & 1153
  • BROOKRIDGE via breakers 1690 & 1691 5 ' CENTRAL'FLA. via breakers 1693 & 1694
  • NEWBERRY via breakers 3231 & 3232 FEEDBACK SOURCES ~TO CR-3 OFFSITE POWER TRANSFORMER [0PT]'- (NTTR-9)-
  • CR-3 STARTUP TRANSFORMER [SUT] - (MTTR-2)-
  • BACKUP ENGINEERED SAFEGUARDS TRANSFORMER [BEST)

(MTTR-6)

RELAY PROTECTION & CONTROL POWER

  • BREAKERS 1691 & 1692 DC CONTROL POWER SUPPLIED BY CR-1/2 DC SYSTEMS. *

- RELAY PROTECTION SUPPLIED BY CR-1/2 DC SYSTEMS AND CR-3 IE SYSTEM 4

  • . BREAKERS 4900 & 4902 DC CONTROL POWER-SUPPLIED BY CR-3 IE SYSTEM RELAY PROTECTION. SUPPLIED BY'CR-3 lE SYSTEM AND CR-l&2 SYSTEM (via. interposing circuits) r w

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500 kV SWITCHYARD RING BUS DESIGN i

PLANT INPUTS TO 500 kV SWITCHYARD

~

e CRYSTAL-RIVER UNIT 3 e CRYSTAL RIVER UNIT 5 TRANSMISSION TIES TO 500 kV SWITCHYARD e BROOKRIDGE e CENTRAL FLA FEEDBACK SOURCES TO CR-3 e BACKFEED CAPABILITY (during outages via MOS 1873) l RELAY PROTECTION & CONTROL POWER e BREAKERS 1661 &-1662 DC CONTROL POWER SUPPLIED BY 500 kV DC SYSTEM

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. NORMAL OPERATION.DURING OUTAGES i

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ELECTRICAL REQUIREMENTS OPTIONS FOR E.S.. POWER DURING OUTAGES 500 kV-BACKFEED

-- BEST (MTTR-6) 0FFSITE-POWER TRANSFORMER (MTTR-9)

- - EGDG-1A & EGDG-1B OPTIONS FOR BOP POWER DURING OUTAGES (including FWP-7) 500 kV BACKFEED STARTUP TRANSFORMER (MTTR-2) t I

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CRYSTAL RIVER UNIT 3 MOD 5 S&6 DAILY PLANT STATUS REPORT DAY FRIDAY DATE 03/12/93 TIME 0500 MODE 5 RCS TEMP

'F RCS BORON 1557 PPMB RCS PRESS PSIG SHUTDOWN MARGIN

-2.2

% aK/K IN.

PZR)

FT.[Rx VESSEL)

RCS LEVEL RCS LEVEL

(

E.S. POWER SUPPLIES REACTOR COOLING METHODS E.S ELECTRICAL SUPPLY SYSTEM IN SERVICEf ):

SYSTEM (S) IN SERVICE ( ):

/ 500KV BACKFEED T' A DH TRAIN -- B OTSG A OTSG B DH TRAIN

~~ STARTUP TRANSFORMER MTTR-2 <

0FFSITE POWER TRANSFORMER M1TR-9 E.S. ELECTRICAL SUPPLY SYSTEM BACKUPI 1:

Ditt SYSTEMS AVAILABLE f ):

500KV BACKFEED COOLING INVENTORY STARTUP TRANSFORMER NTTR-2 OFFSITE POWER TRANSFORMER N!TR-9 "A"

SIDE

'B' SIDE

/ A DH TRAIN B DH TRAIN

/ A RCBT 7 A SF TRAIN B SF TRAIN 7 B RCBT

$ERGENCY E.S. POWER SUPPLIES AVAILABLEf ):

A OTSG 7 B'OTSG C RCBT 7 A LPI

~~~ B iPI 7 A BAST EGDG-1A

'~~ EGDG-1B 7 A MVP B MVP 7 8 BAST

/

\\ -" B MUP C MVP 7 A CFT

~

7 B CFT STATILE BATTERIES AVAILABLE( 11 CANAL FILL

/._ DPBA-1 A

_ DPBA-1B

_ BWST GRAVITY FEED G9KLAIMENT PEh!TRATIONS CONTAINENT C00LIMG CONTAINMENT PENETRQIONS OPEN TO ATMOSPHERE ( ):

SYSTEMf S) IN SERVICEf ):

PURGE SUPPLY VALVES AHF-1A SV COOLING

/

UIPMENT HATCH

'UIP60!T HATCH AIR LOCK ' 7 PURGE EXHAUST VALVES AHF-1B

-' CI COOLING RSONNEL HATCH A!P. LOCK I*

OTHER ITEMS AHF-lC rRefer to listing of Equipment Clearances sorted by Penetration f my:SPtCIACREQUi:lEMEMS7UNIMl]AECONDITIDN' OR[ SYSTEM ' ALIGNMENTS ;

T MWWW@W5E@d{@T$TSiXCT IDN ? STATENENT$T INTEFFECTJ*'** *R

~

111 IHLE ENTRY DATE/ TIME ACTION FPP Tabic Fire Barriers 03-10-92/ 1410 Hourly Roving Patrols 3.4.9.2 RCS Pressure Limits 03-05 93/ 1255 Need Engineering Evaluation 00CM TELE RM.-7 03-04-93/ 1247 Sample Every 8 Hours NIe i @ N k l E I M a M M 3!2 9 1993 GOAL: du 5 FOR CYCLE: 93.1%

FOR YEAR:

88.2%

Capacity Mys Nr

  • i'+; foi '93 Outiges: $4.72 Days SAE IUEGAL EFFICIENT

RECENT MODIFICATIONS TO SWITCHYARD e OFFSITE POWER TRANSFORMER [0PT] - (MTTR-9) installed during 8M outage (Fall 1991)

- -designed to power ES 4160 V. Busses 3A and 3B i

e BACKUP ENGINEERED SAFEGUARDS TRANSFORMER [BEST) - (MTTR-6) final tie in completed during 9M outage (Spring 1993)

- designed to power ES 4160 V. Busses 3A & 3B BEST installation isolated MTTR-2 as ES Power source.

installation required clearance on breakers 1691 &'1692 (resulting in isolation of MTTR-2) t

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i PLANT CONFIGURATION @ TIME OF " STORM OF CENTURY" DECAY HEAT REMOVAL SYSTEMS AVAILABLE "A" DECAY HEAT REMOVAL TRAIN (providing reactor cooling)

"A"' SPENT FUEL TRAIN "A" LPI "A" MAKEUP PUMP ENGINEERED SAFEGUARDS ELECTRICAL SUPPLY PRIMARY - 500 kV BACKFEED ALTERNATE STARTUP TRANSFORMER (MTTR-2)

EMERGENCY - EGDG-IA

-BATTERIES - DPBA-1A CONTAINMENT PENETRATIONS OPEN TO ATMOSPHERE EQUIPMENT HATCH (closed following inclement weather alert)

PURGE EXHAUST VALVES

y 1

Management Review Team Reviewed Switchyard Events to-i 1.

determine adequacy of root cause evaluations 2.

determine adequacy of corrective actions 3.

identify generic issues and enhancements j

4 i

l

Storm Scenario Fridav. March 12.1993 1559 Dispatcher issues telecom message " Severe Weekend Weather Predicted." Tonight, severe thunderstorms, strong / gusty winds, followed by cold wave late Saturday, Sunday and Monday, i

2145 Site Tornado Watch in effect 2300 Fringes of storm begin in move into Citrus County area. Moderate wind gusts and light rain and drizzle begin to fall.

2400 Storm moves ashore with strong wind gusts

\\

l Storm Scenario Saturday. March 13.1993 0045 Microwave system goes out due to wind damage to microwave dishes and antennas 0152 Various lines throughout system begin to spuriously lock out 0354 Wind gusts to 50 mph with heavy rain 0435

-Wind gusts up to 60 mph at Crystal River. Backup meteorological tower goes down.

-Lost power to CR-3 berm air compressors. In-plant compressors started.

0550 CR-5 trips due to salt spray flashover 0600

-CR-3 declares Unusual Event due to flooding greater than 98' plant datum.

-Breaker 1661 opens. Unable to reclose.

0730 CR-4/5 reserve auxiliary transformers trip due to salt spray flashover. CR-5 in blackout condition.

0845

-Breakers 1691 and 1692 open (Feeds to CR-3 start-up transformer)

-CR-3 "A" emergency diesel started (manually) and loaded onto emergency safeguards bus.

0930 Crystal River switchyards flooded to foundation caps 2300 CR-3 exits Unusual Event. Power re-connected to plant from 500 KV backfeed. Electrical grid stable.

o FLORIDA POWER CORPORATION

' e?

CRYSTAL RIVER UNIT 3 MODES 5&6 DAllX PLANT STATUS REPORT DAY FRIDAY DATE 03/12/93 TIME 0500

, MODE 5 RCS TEMP 85

'F RCS BORON 1557 PPMB RCS PRESS T PSIG SHUTDOWN MARGIN

-2.2

% AK/K RCS LEVEL 75-~ IN. PZR1 RCS LEVEL T7A FT. Rx VESSEL)

E.S. POWER SUPPL'rS REACTOR COOLING METHODS E.S ELECTRICAL SUPPLY SYSTEM IN SERVICE ( ):

SYSTEM (S) IN SERVICE ( ):

/ 500KV BACKFEED A OTSG B OTSG STARTUP TRANSFORMER MTTR-2 T A DH TRAIN Z B DH TRAIN Z 0FFSITE POWER TRANSFORMER MTTR-9 E.S. ELECTRICAL SUPPLY SYSTEM BACKUP ( ):

DHR SYSTEMS AVAILABLE ( ):

/ 500KV BACKFEED COOLING INVENTORY 7 STARTUP TRANSFORMER MTTR-2

- 0FFSITE POWER TRANSFORMER MTTR-9 "A" SIDE "B"

SIDE

/ A DH TRAIN B DH TRAIN

/ A RCBT 7 A SF TRAIN B SF TRAIN 7 B RCBT EMERGENCY E.S. POWER SUPPLIES AVAILABLE( ):

A OTSG 7 B OTSG C RCBT 7 A LPI B LPI 7 A BAST

-/ EGDG-1A

- EGDG-1B 7 A MVP B MVP 7 B BAST B MVP C MVP 7 A CFT STATION BATTERIES AVAILABLE( ):

v B CFT

- CANAL FILL

_!_DPBA-1A

_ DPBA-18

_g5 GRAVITY CONTAINMENT PENETRATIONS CONTAINMENT COOLING CONTAINMENT PENETRATIONS OPEN TO ATMOSPHERE ( ):

SYSTEM (S) IN SERVICE ( ):

/ E0VIPMENT HATCH PURGE SUPPLY VALVES AHF-1A SW COOLING EOUIPMENT HATCH AIR LOCK 7 PURGE EXHAUST VALVES AHF-18

~~ CI COOLING PERSONNEL HATCH AIR LOCK OTHER ITEMS AHF-1C FRefer to listing of Equipment Clearances sorted by Penetration #

S P EC I All; R EQUI REMENTS / UNU S U.A G.CONDI T ION.Sf0 RiS Y S T EMj AL I G NM ENTS i

~'wa*?STS7ACTIONlSTATEMENTSEIN! EFFECTS ****2 111 IllLE ENTRY DATE/ TIME ACTION FPP Table Fire Barriers 03-10-92/ 1410 Hourly Roving Patrols 3.4.9.2 RCS Pressure Limits 03-05-93/ 1255 Need Engineering Evaluation ODCM TABLE RML-7 03-04-93/ 1247 Sample Every 8 Hours TCAPACITYlFACTORlT01DATEP 1993 G0AL: 80.0 %

FOR CYCLE: 93.1%

FOR YEAR:

88.2%

Capacity days remaining for '93 Outages: 64.72 Days SAFE, LEGAL EFFICIENT

4 March 13 - Switchyard flooding Descriotion:

e Switchyard flooding occurred when storm and high tides caused Ultimate Heat Sink Level to reach 99' plant datum o Power to CR-3 start-up transformer lost (not connected to plant loads) e Breaker 1661 spuriously opened in 500 KV switchyard e Power remains available from 500 KV switchyard throughout event Cause:

Record breaking winter storm Corrective Action:

  • Established plan to wash down insulators in switchyard e Entered Unusual Event and took immediate actions to prevent facility flooding and ensure dependable power supply
  • Critiqued emergency response.

Revised storm emergency procedure to incorporate lessons learned.

FLORIDA POWER CORPORATION 9?

CRYSTAL RIVER UNIT 3 MODES 5&6 DAILY PLANT STATUS REPORT DAY MONDAY DATE 03/15/93 TIME 0500 MODE 5 RCS TEMP 92

RCS LEVEL 774 FT.(Rx V E.S. POWER SUPPLIES REACTOR COOLING METHODS E.S ELECTRICAL SUPPLY SYSTEM IN SERVICE ( ):

SYSTEM (S) IN SERVICE ( ):

/ 500KV BACKFEED A OTSG B OTSG STARTUP TRANSFORMER MTTR-2 7 A DH TRAIN B DH TRAIN Z OFFSITE POWER TRANSFORMER HTTR-9 E.S. ELECTRICAL SUPPLY SYSTEM BACKUPf 1:

DHR SYSTEMS AVAILABLE ( ):

/ 500KV BACKFEED COOLING INVENTORY 7 STARTUP TRANSFORMER MTTR-2

-7 0FFSITE POWER TRANSFORMER MTTR-9 "A"

SIDE "B"

SIDE

/ A DH TRAIN B DH TRAIN

/ A RCBT 7 A SF TRAIN B SF TRAIN 7 B RCBT EMERGENCY E.S. POWER SUPPLIES AVAILABLE( ):

A OTSG 7 B OTSG C RCBT 7 A LPI B LPI 7 A BAST'

-/ EGDG-1A

- EGDG-1B 7 A MVP B MVP 7 8 BAST STATION BATTERIES AVAILABl1[_)_t

- B MVP

~ CMVP 7 A CFT 7 B CFT

-_ CANAL FILL

_L DPBA-IA

_ DPBA-1B

_ BWST GRAVITY FEED CONTAINMENT PENETRATIONS CONTAINMENT COOLING CONTAINMENT PENETRATIONS OPEN TO ATMOSPHERE ( ):

SYSTEM (S) IN SERVICE ( ):

ECUIPMENT HATCH PURGE SUPPLY VALVES

/ AHF-1A SW COOLING ECUIPMENT HATCH AIR LOCK 7 PURGE EXHAUST VALVES AHF-1B 7 CI COOLING PERSONNEL HATCH AIR LOCK

--- OTHER ITEMS AHF-1C FRefer to listing of Equipment Tlearances sorted by PenetratiUH #

SPECIAGREQUIREMENTSlUNOS.0AECONDITIO.NS70RMYSTEM?ALI.GNMENTS7

^~

9*'**STS?ACTIONYSTATEMENTStINTEFFECTf**~**l 1LS TITLE ENTRY DATE/ TIME ACTION FPP Table Fire Barriers 03-10-92/ 1410 Hourly Roving Patrols 3.4.9.2 RCS Pressure Limits 03-05-93/ 1255 Need Engineering Evaluation ODCM TABLE RML-7 03-04-93/ 1247 Sample Every 8 Hours 3.3.3.3(a) SI-005-MEl 03-12-93/ 1255 Repair < 30 Days, Report 3.3.3.11.1 AH-648-CE 03-13-93/ 1200 Repair < 7 Days, or CC in Recirc 3.3.3.4 MMP-1/MMP-3 Wind Speed 03-14-93/ 0200 Repair < 7 Days, or Special Report

. CIT,Y5l FACTOR?T0]DATE[~"

f f^

1993 G0AL: 80.0 %

FOR CYCLE: 92.0%

FOR YEAR:

84.5%

Capacity days remaining for '93 Outages: 61.72 Days SAFE, LEGAL EFFICIENT

4 March 17 - Insulator flashover with spurious 230 KV breaker opening

==

Description:==

Breakers in the 230 KV switchyard begin spuriously opening. Voltage fluctuations are observed on 230 KV switchyard. Flashover across insulators in 230 KV switchyard observed.

Precautionary Unusual Event declared e

500 KV switchyard was stable Cause:

Salt contamination on insulators due to storm Corrective Action:

e Entered unusual event and took immediate action to ensure dependable power supply e Washed down switchyard insulators e investigating mechanism to monitor insulator status to determine need for washdown prior to flashover e Revising plant procedures to require prompt evaluation of potential salt contamination of switchyard insulators e Installing party-line capability in TSC

INSULATOR WASHDOWN e

Plan established March 13 e

First priority was washdown of electrical insulators to allow Units 4/5 to start up and supply power to grid, Emphasis was placed on insulator washdown plan that would not o

jeopardize shutdown or personnel safety.

Insulator washdown was occurring throughout system. Dedicated e

crew was assigned to Crystal River Energy Complex along with CR-3 technical manager, No problems experienced with insulator flashovsr until March 17 e

when rain and drizzle commenced.

March 29 - Spurious loss of 500 KV backfeed Descriotion:

Off-site power via 500 KV backfeed lost which caused a loss of decay heat removal.

Decay heat removal was restored using EDG within five minutes.

Cause:

A control power cable in the 500 KV switchyard failed.

Corrective Action:

e Unusual Event declared

  • Tested all cables in trench and replaced faulty cables

e Developing plan to test all switchyard cables in 230 KV and 500 KV yards e Evaluating adequacy of testing methods for newly installed cables e Evaluating need for periodic testing of switchyard cables.

?

April 8 - Unplanned loss of 500 KV backfeed

==

Description:==

During performance of switchyard maintenance, off-site power via the 500 KV backfeed was lost which caused a loss of decay heat removal.

Decay heat removal was restored within three minutes using EDG.

Cause(s):

e inadequate shift turnover in Electric Shop e Lack of clear guidance for responsibility for switchyard work e Work instructions did not provide sufficient detail e Plant personnel were not trained on switchyard batteries and chargers

  • Pre-olanning was deficient Corrective Action:
  • Entered Unusual Event e implemented procedural controls which prohibit switchyard work from being performed in switchyard that is supplying emergency power e Repaired protective relaying in switchyard

)

i e Reviewed and enhanced maintenance shift turnover practices e Established guidance providing that switchyard maintenance be performed by non-nuclear work groups that normally perform such maintenance o Reviewing suitability of acceptance criteria for switchyard battery testing

7[. o l

General Task Force Recommendations l

Guidelines for determining level of detail required in. work e

instructions require review for adequacy..

Administrative instructions for Reduced. Reactor Coolant System

)

o Inventory operations should be expanded to include all Mode 5 operations.

During outages, no work should be performed in the switchyard i

e providing power for shutdown cooling.

e Interface procedures, while effective, require

updating, consolidation and enhancement.

Nuclear staff technical knowledge of switchyard design and e

operations requires enhancement.

Timing is essential for removing SALT from insulators.

1 j

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