ML17254A982
| ML17254A982 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 09/19/1984 |
| From: | KOBER R W ROCHESTER GAS & ELECTRIC CORP. |
| To: | MURLEY T E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737 NUDOCS 8410120179 | |
| Download: ML17254A982 (4) | |
Text
I/ESPIll/!gj///I!/
/II///I/t/I//
//I///Flil izszzzROCHESTER GASANDELECTRIC.lEgyp'ORPORATION o89EASTAVENUE,ROCHESTER, N.Y.14649-0001 ROGERW.KOBERVlCCPRCSIDCNT ELECTRIC&STEAMPRODUCTION TCLCPHONC ARcAcoDcTld546-2700September 19I1984Dr.ThomasE.MurleyiRegionalAdministrator U.S.NuclearRegulatory Commission RegionI631ParkAvenueKingofPrussiaiPennsylvania 19406
Subject:
PostAccidentSamplingSystemR.E.GinnaNuclearPowerPlantDocketNo.50-244
DearMr.Hurley:
InourlettertoyoudatedJune28I1984Iweexplained thatthetestingofthePostAccidentSamplingSystem(PASS)wouldbecompleted bytheendofJulywiththeensuingdataevaluation andcloseoutofthetestprogramtobecompleted bytheendofAugust.Thesystemtestinghasbeencompleted successfully withtwoexceptions.
Thoseexceptions arethedetermination ofdissolved gassesinreactorcoolantandthedetermination ofpHinreactorcoolantundernormaloperating conditions.
Measurement ofdissolved hydrogenorgrossactivityinthecoolantisrequiredfordetermination ofcoredamageandcorrosion potential.
Ourdesignprovidesforgassamplingbygasstripping andanalysisforhydrogenwithagaschromatograph andforgrossactivitybyisotopicanalysis.
Inattempting todetermine thedissolved hydrogeninreactorcoolantbyemploying thegasstripping methodiresultsindicatearepeatability deviation ofmorethan10%.Thisisbeyondthelimitsestablished byNUREG-0737 fordissolved hydrogen.
Inourtestprogram>wehavedemonstrated thatwecandetermine totalgaseousactivityofstrippedgassamplestakenfromthePASSwithinafactorof2.Wehaveinformedthemanufacturer ofthesystemofthetestresultsandheiscurrently scheduled tobeon-siteinthenearfuturetoevaluatethesituation.
Untilsuchtimethatthemanufacturer ofourPASScandetermine thecauseforpoordissolved H2resultscweproposetorelyonatotalgasdetermination.
8<<<<~o"9S00024~'~'<091~DZqDOCX0P+)p l.)
SHEETNOROCHESTER GASANDELECTRIFEORP.
."<;September 19I1984Dr.ThomasE.MurleyI~Measurement ofreactorcoolantpHisalsorequired.
Whentest'ingwithstandardsolutions>
themonitorisaccuratewithintherequirements oftheNUREG0737.Howeveriwhenmeasuring thepHof-'thereactorcoolantduringnormaloperationi thePASSmonitordoesnotrespondwiththerequiredaccuracy.
Basedontesting>ourchemistshaveconfirmed thatthisisduetothelowionicactivityofthecoolantduringnormaloperation.
Duringanemergency situation withfailedfuelwhenthePASSmustbeusedduetoradiation exposureconsiderationsi itisexpectedtheionicactivityofcoolantwouldbesufficient toprovideaccuratepHmeasurement.
Basedoncomparison ofPASSresultswithlaboratory resultsofothersamples>e.g.iboronconcentration measurement resultsiwedonotbelievethatthepHmeasurement discrepancy duringnormaloperation isoneoflackofrepresentativeness ofthesample.Althoughwebelievethecurrentsituation isacceptable basedonlaboratory analysesof"clean"reactorcoolantandPASSanalysisofhighlyradioactive samples>wearecontinuing toexplorethissituation withthemanufacturer.
Statistical analysesofthefinaldataareinprogressr havingbeendelayedbythedifficulties identified above.Allanalyses>
exceptforthedissolved hydrogenandanythatmayberequiredbyachangeinthepHanalysismethodology>
willbecompletebyOctober15.Wehavealsoexperienced component failuresrecently.
Thefailureratehasincreased astheuseofthePASSincreases fortrainingpurposesand,mayalsobeattributable inparttothedevelopmental natureofthesystem.Agenericprobleminthedesignofaregulating valveforthespecificintendedfunctionhasbeenidentified.
Themanufacturer issupplying repairkitssothatthesystemcanbemaintained operableandispursuingotheralternatives forthisservice.etrulyyoursrRrW.Kober IOIT7H~0