10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...

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Updated Final Safety Analysis Report - (STS-004-002)13.1.8 Calculation of Total Contamination InventoryThe total contamination inventory for the primary and auxiliary systems was estimated based on thesample data. The contamination inventory is broken into two parts: internal surface contaminationand contamination entrained in residual coolant.13.1.8.1 Surface ContaminationThe surface contamination estimate begins with an assessment of the steam generatorcontamination content. Published industry data indicate that in pressurized-water reactors(PWRs), the majority of coolant-borne corrosion/fission products that are not removed by thechemical volume and control system (CVCS) are deposited in the steam generators. For areference PWR (Trojan), the generators contain about 85% of the total deposited activationproduct inventory. The balance of the activity is distributed in various other components basedon relative surface area and deposition characteristics of the system/component.Steam generator activity content was estimated based on the highest contamination level foundin the starboard generator. Assumptions for the calculation are as follows: The only nuclide of concern for surface contamination is Co-60; Smears were taken over a 100-cm 2 area; and, The removal factor for smears is 0.1The estimated internal steam generator surface area was calculated to be 7.2E6 cm 2 and totalestimated activity in one generator in curies is calculated 46.8 mCi or 93.6 mCi for both steamgenerators.Adjusting for reactor/steam generator surface area ratios and unit layout (2-loop vs. 4-loop),activity distribution assignments were made based on the reference PWR. Associated activitylevels were calculated and are summarized in Table 13-7.Table 13-7 Total Surface Contamination InventorySystem Activity distribution (%) Total estimated activity (Ci)Reactor vessel andinternals5 0.0054*Steam generators 87 0.0936Primary coolantsystem pipingAuxiliary systemspiping3 0.00322.3 0.0025Pressurizer 0.2 0.0002Other 2.5 0.0027Totals 100 0.108 or 108 mCi* Excludes volumetrically distributed activation products in the reactor vesselScans and samples confirmed that the primary nuclide deposited on surfaces in reactor systemsis Co-60. The total estimated inventory of Co-60 in surface deposits is approximately 100 mCi.Rev. VI 142
Updated Final Safety Analysis Report - (STS-004-002)13.1.8.2 Contamination in Residual CoolantSteam generator hot-leg access was performed to investigate the existence and quantity of waterin the primary coolant system beyond the reactor vessel for this purpose. Note thatapproximately 1500 gallons were found in the primary system. This volume is approximately15% of the normal operating water volume of the system (approximately 10,000 gallons).Given that the primary and auxiliary were drained to the maximum extent practical in March1976, the quantity of water present in the generators and lower hot-leg piping was greater thanexpected. This quantity of water is theorized to have due to draining but not pumping thesystem “dry.” It may also have resulted from the migration of water from the reactor pressurevessel (RPV) lower head during the subsequent 30 years as the ship has been subjected tonormal movements caused by sea action, and list/trim adjustments made for towing anddrydocking. Smear and water samples were obtained from inside the steam generators. Anestimate of the total contamination inventory is made based on samples from the starboardsteam generator. The dose rates and contamination levels are listed in Tables 13-8 and 13-9.Table 13-8 Steam Generator Dose Rates (primary system side)Dose ratesStarboard steam generator(mR/hour)Outside inner cover seal 32 34At opening plane 45 N/AAt mid plenum 275 344At tube sheet 525 812Port steam generator(mR/hour)Table 13-9 Steam Generator Contamination Levels (primary system side)Contamination levelsStarboard steam generator(dpm/100 cm 2 )Inside, top of plenum 14,798 22,000Inside, left of accessopeningInside, right/below ofaccess opening13,183 6,09651,682 4,144Plenum tube sheet 166,730 378,673Inside surface of SS coverseal10,211 7,654Port steam generator(dpm/100 cm 2 )The volume of water in primary coolant system was determined by verifying water levels invarious points in the system and using this data to calculate the water remaining in the system.The results are listed in Table 13-10.Rev. VI 143
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10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...

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