10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...
10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...
10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...
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7.1.2.3 Water ChemistryUpdated Final Safety Analysis Report - (STS-004-002)The water chemistry <strong>of</strong> the primary, secondary and cooling water systems <strong>of</strong> the NSS wascarefully controlled to limit corrosionand activation. The primary systemwater quality was maintained to Table 7-1 Primary System Water Qualityconform to the standards shown inMaximum amountTable 7-1. See 8.6 for additionaldescription <strong>of</strong> Water Chemistry and Total solids, ppm 3.0Control.Dissolved solids, ppm 1.0The water chemistry program wasChloride, ppm 1.0effective in controlling corrosion andactivation <strong>of</strong> the water systems. Dissolved hydrogen, cc20 to 40Typical measurements <strong>of</strong> corrosion STP/kg waterproduct activity one day after shutdownpH 6.0 to 9.5were 130 mR/hr in the vicinity <strong>of</strong> thesteam generators and 25 mR/hr near the reactor vessel.7.1.2.4. RadiochemistryA sustaining program <strong>of</strong> radiochemical measurements was conducted during the operatingperiod <strong>of</strong> the NSS. Measurements were begun prior to initial operation <strong>of</strong> the reactor.Measurements <strong>of</strong> the system background indicated that the primary system was radiochemicallyclean. At the time <strong>of</strong> criticality, the multi-channel gamma spectrometer was used to obtaingross spectrum activity and energy peak decay <strong>of</strong> the primary coolant. At power levels above<strong>10</strong>0 kW and prior to power range testing, only F-18 and N-13 were observed; this was normalfor pressurized-water reactors. The primary system radioactivity characteristics werecontinuously evaluated by measurements <strong>of</strong> gross-15-minute-degassed and gross-iodine-activitysamples. Extrapolated to <strong>10</strong>0% power, gross activity was 5.5E-2 µCi/ml and gross iodineactivity was 1.2E-4 µCi/ml immediately after initialoperation.A very slight uranium surface contamination <strong>of</strong> thefuel pins was indicated. Iodine studies were madeafter power transients and after a scram, but nosignificant changes in iodine level were observed.The amount <strong>of</strong> fuel element surface contaminationby natural uranium was determined by calculationsbased on fission-product activity in the coolant.The results indicated a uranium concentration <strong>of</strong>approximately 5.0E-2 µCi/cm 2 <strong>of</strong> fuel elementsurface. This amount <strong>of</strong> contamination appeared tobe a practical lower limit and caused no operationalproblems.A sample <strong>of</strong> primary coolant was taken when thereactor was at full power and was analyzed forsuspended solids. More than 99% <strong>of</strong> the activitywas Mn-56. There was no detectable Fe-59, Co-60,Co-58, W-187, or Cr-51. The total activity <strong>of</strong> adegassed sample <strong>of</strong> primary system water wasTable 7-2NuclideN-l3* (* = Notremoved bydegassing)Primary SystemRadiochemistryPercentage <strong>of</strong>gross activity1.25F-18 14.9Mn-56 77.9Na-24 4.0Gross I 0.3Cs-138 0.12Ba-139 0.04Total strontium 0.05Rev. VI 63
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