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MEMORANDUM FOR: Charles E. Rossi, Director '

Division of Operational Events Assessment !

Office of Nuclear Reactor Regulation

FROM: Johns P. Jaudon, Acting Branch ChiefEverts Assessment BranchDivision of Operational Events AssessmentOffice of Nuclear Reactor Regulation

SUBJECT: THE OPERATING REACTORS EVENTS MEETINLAugust 23, 1988 - MEETING 88-34

On August 23, 1988, an Operating Reactors Events meeting (88-34) was held tobrief senior managers from NRR, OSP, AE00, Commission Staff, and Regional,

Offices on events which occurred since our last meeting on August 16, 1988. Thelist of attendees is included as Enclosure 1.

The events discussed and the significant elements of these evente are presentedin Enclosure 2. Enclosure 3 presents a summary of reactor scrams for theweek ending August 21, 1988 and a scram summary for the first six months of1988. No significant events were ident1fied for input to NRC's PerformanceIndicator Program.

Johns P. Jaudon, Acting 8 ranch ChiefEvents Assessment Branch

. Division of Operational Events AssessmentOffice of Nuclear Reactor Regulation

Enclosures:As stated

cc w/Encio.:See Next Page

,

|

DISTRIBUTIONCentral File

| EAB Reading FileCirculating Copy EAB Staff'

MLReardon, EAB00udinot, EAB (

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J. N. Grace, RI!R. D. Martin, RIVJ. B. itartin, RVW. Kane, RI

~L. Reyes, RIlE. Greenman, RillJ. Callan, RIV ,

'

L D. Kirsch, RVS. Varga, 14E-4'

D. Crutchfield, 13A-2B. Boger, 14A-2G. Holahan, 13H-4G. Lainas, 14H-3L. Shao, 8E-2J. Partlow, 70-24B. Grimes, 9A-2F. Congel, 10E-4 *

E. Weiss, AEODT. Martin, 12G-18J. Guttmann, SECY :

| A. Thadani, 7E-4S. Rubin, AE00

| R. Barrett, 10E-2.

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_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ . _ _ _ _ _ _ _ _ _ _ _ _ . . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . . _ _ _ _ . _ _ _ _ _ _ _ . _ _ _ _ . _ _ _ _ . _ _ . _ _ _ _ _ _ _ _ _ . _ . _ _ _ _ _ _ _ _ _ _

- -.

'/ "%, UNITED STATES8 NUCLEAR REGULATORY COMMISSION

'

o.

5 |WASHINGTON D. C. 20665

\**.../

HEMORANDUM FOR: Charles E. Rossi, Director.

Division of Operational Events AssessmentOffice of Nuclear Reactor Regulation

FROM: Jchas P. Jaudon, Acting Branch ChiefEvents Assessment BranchDivision of Operational Events AssessmentOffice of Nuclear Reactor Regulation

SUBJECT: THE OPERATING REACTORS EVENTS HEETINGAugust 23, 1988 - MEETING 88-34

On August 23, 1988, an Operating Reactors Events meeting (88-34) was held tobrief senior managers from NRR, OSP, AEOD, Comission Staff, and RegionalOffices on events which occurred since our last meeting on August 16, 1988. Thelist of attendees is included as Enclosure 1.

The events discussed and the significant elements of these events are presentedin Enclosure 2. Enclosure 3 presents a sumary of reactor scrams for theweek ending August 21, 1988 and a scram summary for the first six months of1988. No significant events were identified for input to NRC's PerformanceIndicator Program,

on, Acti g %tLoo ns P. Ja Branth Chief

Events Asse sment Branch |

Division of Operational Events AssessmentOffice of Nuclear Reactor Regulation

Enclosures:As stated

cc w/Enclo.: )See Next Page |

|

t

- - ,. . . . . , . . - - - - ..

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* *ENCLCSilRE 1.

.

LIST OF ATTENDEES

OPERATING REACTORS EVENTS BRIEFING (88-34)

August 23, 1988

NAME' ORGANIZATION NAME ORGANIZATION

R. Scholl. NRR/DOEA M.L. Reardon NRR/DOEAD. Crutchfield NRR/DRSP' W. Minners RES/DRPSD.C. Fischer NRR/00EA P. ' Baranows ky NRR/DOEAV. Benaroya AEOD/DSP B. Boger ' NRR/ADR 1S. Varga .NRR/DRP J.W. Clifford DEDROC.J. Haughney NRR/DRIS D.R. Muller NRR/PD3-1J. Ramsey NRR/D0EA C. McCracken NRR/ECEBG. Lainas NRR/ADR-2 J. Jaudon NRR/DOEAD. Terao OSP/CP V. Hodges NRR/DOEAM. Chiramal AE00/ROAB

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.' ENCLO5URE 2''

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OPERATING REACTORS EVENTS BRIEFING 88-3l4

EVENTS ASSESSMENT BRANCH

LOCATION: 12-B-ll WHITE FLINTi

TUESDAY, AUGUST 23, 1988, 11:00 A.M.

,

ZION UNITS 1 8 2 THINNING 0F EXTRACTION STEAM (ES)PlPING

:

GENERIC ISSUE 10 CFR PART 21 NOTIFICATION FROM GE

REGARDING BINDING 0F MOVABLE CONTACT '

FINGERS.lN HFA RELAYS ;,

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88-34,

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ZION UNITS'1 8 2THINNING 0F EXTRACTION STEAM (ES) PIPING

JULY 23, 1988

.-

PROBLEM

WALL THICKNESS IS LESS THAN NOMINAL IN SOME AREAS,

CAUSE

EROSION / CORROSION,

SAFETY SIGNIFICANCE

HAZARD TO PLANT STAFF FROM CATASTROPHIC FAILURE OF THE PIPING ANDSYSTEM INTERACTIONS,

DISCUSSION

o ON 07/23/88, UNIT I WAS SHUTDOWN TO REPAIR AN ES LEAK,

o ON 08/09/88, UNIT 2 WAS SHUTDOWN TO ULTRASONICALLY TEST ES PIPING,,

o EACH UNIT HAS TWO 16-INCH ES PIPES FABRICATED FROM 500 MIL TYPEA-106B CARBON STEEL,

o MINIMUM WALL THICKNESSES IN UNIT 1 WERE O AND 130 Mils AND INUNIT 2 WERE 190 AND 370 MILS,

o SURFACE AREAS THINNED TO LESS THAN 300 MILS IN UNIT 1 WERE1,5 SQ, FT, IN EACH PIPE AND IN UNIT 2 WERE 0 AND 1,3 SQ, FT,

o THIS EVENT IS COVERED BY SURRY BULLETIN 87-01, IN 86-106, ANDSUPPLEMENTS 1 AND 2 T0 IN 86-106,

o THE BULLETIN COVERS CONDENSATE, FEEDWATER, STEAM, AND CONNECTED

HIGH-ENERGY SYSTEMS, WHETHER SAFETY-RELATED OR NONSAFETY-RELATED,

o BULLETIN RESPONSES ARE SUMMARIZED IN IN 87-17, WHICH STATES THAT

THINNING PROBLEMS IN TWO-PHASE PIPING EXISTS IN VIRTUALLY ALLOPERATING PLANTS,

o NUMARC, EPRI, AND INP0 HAVE PROVIDED A PROGRAM FOR MONITORING |SINGLE-PHASE PlPING BUT NOT FOR TWO-PHASE PIPING,

|o ZION HAS HAD A MARGINALLY ADEQUATE, INFORMAL PROGRAM SINCE 1982, 1

|)

CONTACT: R. WOODRUFF |REFERENCE: 50.72 # 12936 AND MORNING REPORTS FROM 07/25/88, 08/10/88,

AND 08/15/88: BULLETIN 87-01, IN 86-106, SUPPLEMENT 1 & 2,;

IN 88-17 I

|_ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ . ._ _ __ _ _ _ _ _ _ . ._ . _ _ _ _ _ _ _ _ _ _ _ _ _

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2- 88-314- ZION UNITS-1 & 2 -: ,

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o EPRI EXPECTS-TO ISSUE A TWO-PHASE PROGRAM DURING 12/88, .

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| .N0' ADDITIONAL F0ll0WUP IS PLANNED AT THIS TIME.. !4

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88-34*

.

.

10 CFR PART 21 NOTIFICATION FROM GE REGARDING

BINDING 0F MOVABLE CONTACT FINGERS IN liFA RELAYSAUGUST 17, 1988

PROBLEM

o BINDING OF MOVABLE CONTACT FINGERS IN GE HFA RELAYS,

CAUSE

o MOVABLE CONTACT FINGERS WERE MANUFACTURED WlDER THAN THEALLOWABLE TOLERANCE,

SAFETY SIGNIFICANCE

o POTENTIAL FOR RELAYS NOT PERFORMING THEIR INTENDED FUNCTION,

DISCUSSION

o A LICENSEE HAS HAD DlFFICULTY MAKING WIPE AND GAP SETTINGS OFSOME ilFA RELAYS (CORRECT WIPE AND GAP SETTINGS ARE NECESSARY TOMAINTAIN CORRECT OPERATION AND SElSMIC RATING OF'THE RELAY),

o GE DETERMINED ROOT CAUSE TO BE MOVABLE CONTACT FINGERS THAT WERE

MANUFACTURED WIDER THAN THE ALLOWABLE TOLERANCE (APPARENT QA-0C

BREAKDOWN ALLOWED OUT OF TOLERANCE FINGERS TO BE UTillZED IN HFARELAYS FOR AT LEAST 20 YEARS),

o POTENTIAL FOR SIMILAR PROBLEM APPLIES TO ALL HFA RELAYS,,

o GE RECOMMENDS ALL HFA RELAYS BE CHECKED TO DETERMINE IF A BINDINGCONDITION EXISTS,

F0LLOWUP

o STAFF ISSUED INFORMATION NOTICE 88-69 ON AUGUST 19, 1988 TO

PROMPTLY ALERT INDUSTRY TO THIS SITUATION,,

o STAFF REVIEW IS CONTINUlNG,

o ADDITIONAL ACTIONS WILL BE TAKEN, IF APPROFRIATE, UPON COMPLETIONOF STAFF REVIEW, i

|

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|CONTACT: J. RAMSEY

|_- _ _ __ _ _

- _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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ENCLOSURE 3'

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PyeNo. 1i

08/22188|.

PERFORhMCE INDICATORS SISN!FICANT EVEF4*

PL HT MAME EVENT EVENTDESCRIPT!0N IfR SiONIFICMCE |

DATE

1

MAINYWEE 08/13198 SCRAM COWLICATED IV RESERVE BRE MERS FAILING TO CLOSE1 SCRM u!TM COWLICATIONS

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1-

REACTOR SCRM SUMMARY,

!

M EK EhelW6 Ol/21/N

f I. PLMT SPECIFIC MTAl-

| MIE SITE Uh!T POWER S!6hAL CAUSE COMPL1- Yip Yip Yip

CAT 10NS ANVE MLON TOTAL ;

f 151 151'

08/15/89 SURRY 1 100 A EQUIPMENT NO 2 0 2

08/15i86 MAND 6'AF i 100 A EQUIPMENT N0 4 0 4

08/16/88 SOUTH TEIAS 1 100 A EQUIPMENT NO 2 1 3

08/16/89 TROJAN 1 IM A E00!PMENT NO- 2 0 2

OE/19/f! TUCKEY POINT 4 10'. A EQU!PMENT NC 1 1 2

08/21/!8PALOVERIE 1 75 A EQUIPMENT N0 4 1 5

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Pheno.~ !. ,

08/22/88$CRM SUMARY

01/01/98 10 06/30/88

PLANT NS$5 AUTO AUTO MANUAL MNUAL SCRAMS TOTAL PLANT CR. HRS SCRMS

'ENDCR SCRARS SCRAMS SCRMs SCRAh5 WITH SCRAMS OPER. / IMOi

)151 (151 )!M (!$1 COMPL. CR.HR$

f

ARKAhSAS1 IW 1 0 0 0 0 1 ara uSAS 1 4335 0.23.

ARKA4CAS2 CE 0 0 0 0 0 0 ARKANSAS 2 2004 0.H

BEAVER VALLEY 1 W 1 2 0 0 0 3 DEAVLR VALLEY 1 2862 1.05

DEAVERVALLEY2 W 2 0 0 0 0 2 DEAVER VALLEY 2 3947 0.51

816 ROCK POINT 1 GE 0 1 0 1 0 2 316 ROCK POINT 1 2223 0.90

BRAIDt00D1 W 0 0 0 0 0 0 BRAIDWOOD 1 1643 0.M

BRAIDWOOD 2 W 0 0 0 0 0 0 BRAIDWOCD 2 688 0.M

IRCWh5 FERRY 1 GE 0 0 0 0 0 0 MCWNS FERRY 1 ( 0.00

BRCWNS FERRY 2 6E 0 0 0 0 0 0 BROWNS FERRY 2 0 0.M~

MCWNSFERRY3 BE 0 0 0 0 0 0 BROWNS FERRY 3 0 0.M

IRUNSWICK 1 6E 0 0 0 0 0 0 BRUNSWICK 1 3661 0.00

BRUNSu!CK 2 6E 0 1 1 0 0 2 BRUNSWICK 2 1411 1.42

BYROM 1 W 1 0 0 0 0 1 SYROM 1 3471 0.27

BYRON 2 k 2 0 1 0 0 3 BYRON 2 4311 0.70 ,

CALLAWAY 1 W 3 1 1 0 0 5 CALLAWAY 1 3960 1.26

CALVERT CLIFFS 1 CE 0 0 0 0 0 0CALVERTCLIFFS1 2370 0.M

CALVERT CLIFFS 2 CE 2 0 0 0 0 2 CALVERT CLIFFS 2 3410 0.59

CATAtlA1 W 0 1 0 0 0 1 CATAWM 1 Mel 0.25 |,

CATAWIA2 W 4 0 2 1 1 7 CATAWBA 2 2252 3.11

CLINTON 1 6E 0 1 0 0 0 1 CLINTON 1 3283 0.30

COOK 1 W 1 0 0 0 0 1 COOK 1 4314 0.23

COOK 2 W 0 0 0 0 0 A COOK 2 2716 0.M l

CCDPER 1 6E 1 0 0 0 0 200PER 1 1629 0.61

CRYSTAL KlVER 3 SW 1 0 0 0 1 1 CRYSTAL RIVER 3 4096 0.24 i

i

DAVIS MSSE 1 SW 0 0 0 0 0 0 DAVil MSSE 1 1661 0.M

IIABLO CANYDN 1 W 1 0 0 0 0 1 l!AR O CANYON 1 1532 0..$ |

DIABLO CANYON 2 W ! 0 0 0 0 1 l!ARO CMYON 2 43M 0.23

DRESDEN 2 6E 0 0 0 0 0 0 MESKM 2 4M6 0.M

DREStEN 3 SE 0 0 0 0 0 0 BRESKN 3 2199 0.M |

DUANE ARNOLD 1 6E 0 0 0 0 0 0 SUAE At#0LD 1 4346 0.00

FARLEY 1 W 0 6 0 0 0 0 FARLEY 1 3023 0.H

FARLEY 2 W 0 0 0 0 0 0 FARLEY 2 4367 0.M

FEMI 2 6E 2 1 0 1 0 4 FEMI 2 2078 1,92

FIT! PATRICK 1 6E 0 0 0 0 0 0 Flf! PATRICK 1 3985 0.M

FORT CALHOUN 1 CE 0 0 0 0 0 0 FORT CALHOUM 1 4367 0.00

;DAT ST. VRAIN 1 64 1 0 3 0 0 4FORTST.VRAINi 3679 1.09

6!MA 1 W 2 1 0 0 1 3 GINNA 1 3277 0.92 -

6 RAND BULF 1 6E 3 0 0 0 0 3 IRMO SLAF 1 4153 0.72

HADDAM NECK 1 W 1 2 0 0 0 3 MDOM ECK 1 1760 1.70

HARRIS 1 W ! 0 0 0 0 1 MAM ll ! 4177 0.24

MTCH 1 GE 3 0 0 0 0 3 MTCH 1 3354 0.89

MTCH 2 GE 3 1 1 0 0 5 MTCH 2 2M7 2.40 .

HOPE CREEK 1 GE 1 1 1 0 0 3 HOPE CREEK 1 2936 1.02

INDIAN PolW1 2 W 1 1 0 0 0 2 I H: M Polui 2 3637 0.M

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Pap No. 2s

08/22/89SCRAM SumARY

01/01/98 TO 04/30/88

PLMT WS$$ AUTO AUTO MANUAL MANUAL SCRAMS TOTAL PLMT CR.WRS SCRMS

VENDOR SCRAMS SCRAMS SCRMS SCRMS WITH SCRus OKR. /1000

>151 <!51 >151 (151 COMPL. CR. HRS

f

INDIANPOINT3 W 2 0 1 0 0 3 IMIM POINT 3 3828 0.78

KENAUkEE 1 W 3 0 0 0 0 3 KEWAUNEE 1 3410 0.88.

LACROSSE 1 AC 0 0 0 0 0 0 LACROSSE 1 0 0.00

LASALLE 1 6E 0 0 0 0 0 0 LASALLE 1 1730 0.00

LASALLE 2 6E 1 0 0 0 0 1 LASALLE 2 41M 0.24

LIMERICK 1 6! 0 1 0 0 0 1 LIMERICK 1 4059 0.25

MAINEYAkKEE1 CE 1 0 0 0 0 1 MAINE YANKEE 1 4351 0.23

MC6UIRE 1 W 3 0 1 0 0 4 MC64!RE 1 4286 0.93

MC6UIRE 2 W 0 0 1 o 0 1 MC6UIRE 2 3515 0.28 I

MILLSTONE 1 BE 1 0 0 0 0 1 MILLSTONE 1 4338 0.23 4

MILLSTCNE 2 CE 0 0 0 0 0 0 MI:LSTONE 2 2542 0.M |

MILLSIONE 3 M 2 0 0 0 1 2 MILLSTONE 3 3228 0.62 i

ENilCELLO 1 SE 0 0 0 0 0 0 MONTICELLO 1 4367 0.00

N!ht MILE POINT 1 6E 0 0 0 0 0 0 NINE MILE POINT 1 0 0.M |

NINE MILE POINT 2 6E 5 1 0 0 1 6 NINE MILE POINT 2 1583 3.79 |

ERTH AN44 1 W 0 2 1 0 1 3 NORTH A e4 1 3442 0.82 i

NORTH AMA 2 W 0 0 0 0 0 0 NORTH ANNA 2 4310 0.00

OCONEE1 CW 0 0 0 0 0 0 DCONEE 1 4347 0.M

OCONEE 2 DN 0 0 0 0 0 0 DCONEE 2 2000 0.M

OCONEE 3 IW 0 0 0 0 0 0 OCONEE 3 3051 0.M

OfSTER CREEK 1 E 0 0 0 0 0 0 OYSTER CREEK 1 4347 0.00

PN.!SAMS 1 CE 0 0 0 0 0 0 PAllSAR S 1 3457 0.00

PALDVERDE1 CE 2 1 0 0 0 3 PALO VDtM 1 2579 1.16

PALD VERM 2 CE 0 0 0 0 0 0 PALO VERM 2 1513 0.00

PALD VERDE 3 CE 0 0 0 0 0 0 PALO VERN 3 42M 0.00

PEACH B01105 2 BE 0 0 0 0 0 0 MACH SOTTOM 2 0 0.00

PEACH 80T10M 3 6E e 0 0 0 0 0 MACH BOTTOM 3 0 0.00

PERRY ! SE 4 3 0 0 0 7 M RRY 1 3054 2.29

PIL6R!M1 E 0 0 0 0 0 0PILSRIM1 0 0.00

POINT H ACH 1 W 0 0 0 0 0 0 POINT BEACH 1 3431 0.00 f

POINT KACH 2 W ! 0 0 0 1 1 POINT SEACH 2 4341 0.23

PRAIRIE ISLAG 1 W 0 0 0 0 0 0 PRAIRIE ISLAND 1 4285 0 40

PRA!RIE ISLAG 2 W 0 0 0 0 0 0 PRAIRIE ISLAND 2 349 0.A

DUADCITIES1 E 0 0 0 0 0 0 OUAB CITIES 1 4110 0.00

0040 CITIES 2 E 2 0 0 0 0 2 9U48 CITIES 2 , 2441 0.82

RACHO SECO 1 IW 1 0 0 0 0 1 RANCHO SECO 1 1973 0.51

RIVER M G 1 E 2 1 0 0 0 3 RIVER Kul ! 42M 0.71

R0ilNSON 2 W 3 0 0 0 0 3R00lus0N2 3205 0.94

SAINTLUCIE1 CE 2 0 0 0 1 2 SAlWT LUCIE 1 4328 0.46

SAINT LUCll 2 CE 0 0 0 0 0 0 SAINT LUCIE 2 4347 0.00,

SALEM 1 W 0 1 1 0 0 2 SALEM i 2600 0.74

SA|EM 2 W 3 1 0 0 0 4 SALEM 2 4245 0.94 -

SANONOFRE1 W 0 0 0 0 0 0 SAN ONOFRE 1 1M9 0.M

SAN ONOFRE 2 CE 0 0 0 0 0 0 SM ON0FRE 2 3110 0.Mi

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Pap No,- 3, '

08/22/88$ CRAM SUMMARY

01/01/88 TO 04/30/88

PLWT NSSS AUTO AUTO MANUAL MANUAL SCRAMS TOTAL PLMi 'CR. HRS SCRAMS

VENOCR SCRAMS SCRAMS SCPVS SCRAMS WITH SCRMS OPER. /1000

>151 (151 >151 (151 COMPL. CR. HRS

SM Oh0FRE 3 CE 0 0 1 0 0 1 SAN ON0FRE 3 2632 0.38'

SEABRDOK 1 W 0 0 0 0 0 0 SEABROOK 1 0 0.00'

SE000YAH 1 W 0 0 0 0 0 0 EQUOYM 1 0 0.00

SEQUOYAH 2 W 4 1 0 2 0 7 SEQUDYAH 2 765 8.92

SHOREHAM 1 E 0 0 0 0 0 0 SHOREHAM 1 0 0.00

EDUTH TEIAS 1 W 0 1 0 0 0 1 SOUTH TEIAS 1 1193 0.54

SumER 1 W 3 0 0 0 0 3 SUMER 1 4105 0.73

SURRY 1 W 1 0 0 0 0 1 SURRY 1 2313 0.43'

SURRY 2 W 1 0 1 0 0 2 St'tAY 2 3223 0.62

SUSQUEHAW A 1 E 2 0 0 0 0 2 SUS 0UEHAmA 1 3873 0.52

SUSQUEHAHA 2 E 0 0 0 0 0 0 SUSQUEHAmA 2 1905 0.00

iMI 1 SW G 0 0 0 0 0TMI1 3911 0.00

TROJAN 1 W 1 0 0 0 0 1 TROJM i 2345 0.43

TURKEY P0lWT 3 W 0 0 0 1 0 1TURKEYPO!NT3 3171 0.31

TURKEY FOINT 4 W 0 0 0 0 0 0 TURKEY POINT 4 3246 0.00

VERMONT YAkKEE 1 SE 2 0 0 0 0 2 VERM0WT Y MKEE 1 4201 0.4I

V06TLE 1 W 3 0 1 0 0 4 V06TLE 1 3689 1.04

MTERFORD3 CE 1 1 1 0 0 3 MTERFORD 3 2041 1.05

WNP 2 GE 1 0 1 0 0 2 WIP 2 2424 0.83

WOLF CREEK 1 W 0 0 0 0 0 0 WOLF CREEK 1 3764 0.00

YMKEE R0WE 1 W 3 0 0 0 0 3 Y MKEE ROWE 1 4265 0.70

210N1 W 1 1 0 0 0 2 !!DN 1 2644 0.76

!!0N2 W 0 0 0 0 0 0 !!0N 2 4347 0.00

lli Total til1H 29 20 6 8 155 ,

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Observations Related to Scram Sumary

for Period January 1, 1988 - June 30, 1988

Plants With Highest Trip Rates (Scrams per 1000 critical hoursi

Plant Trio Rate Critical Houis of(scrams /1000 critical hours) Operation

Sequoyah 2 8.92 785Nine Mile Point 2 3.79 1583Catawba 2 3.11 2252Hatch 2 2.40 2087Perry 2.29 3056Fermi 1.92 2078Haddam Neck 1.70 1760Brunswick 2 1.42 1411Ca11away 1.26 3960Palo Verde 1 1.16 2579

The average trip rate is." 0.55 for the period January 1. 1988-June 30, 1988*

The average trip rate was ~_.1.0 last year for the same period.*

Plants With No Scram and largest Number of Critical Hours of Operation

Plant Critical Hours of i

OperationFarley 2 4367Fort Calhoun 4367Monticello 4367Oconee 1 4367Oyster Creek 4367Saint Lucie 2 4367Zion 2 4367Duane Arnold 4346 . '

North % : 2 4318 !'

Prairie Island 1 4285Palo Verde 3 4200

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