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Testing of Dura-Solution at Comanche Peak

Testing of Dura-Solution at Comanche Peak. Jim Pore 254-897-5339 JKPore@luminant.com. The following test results were performed and recorded by the Comanche Peak Radiation Protection Department for comparison and evaluation of decontamination products and methods.

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Testing of Dura-Solution at Comanche Peak

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  1. Testing of Dura-Solution at Comanche Peak Jim Pore 254-897-5339 JKPore@luminant.com • The following test results were performed and recorded by the Comanche Peak Radiation Protection Department for comparison and evaluation of decontamination products and methods. • Dura-Solution was compared to surfactant-based products currently in use in the RCA at Comanche Peak Nuclear Power Plant in the reactor cavity de-con evolution and spent fuel pit equipment.

  2. Dura-Solution Decontamination Test in Reactor Cavity at Comanche Peak -2RF08 • De-contamination of the Unit 2 RX vessel trough using • Dura-Solution • Cavity Work During 2RF08 • Normal Refueling • Guide Tube Pin Replacement Mod. • RX Vessel Trough De-con • § Water and crud was removed (vacuumed) from trough. • § Dura-Solution was introduced to trough. • § Trough and flange was scrubbed using scrub pads with handles. • § Trough and flange was rinsed with water and vacuumed to Lower • Internals Storage Area. (LISA). • LISA floor was afterward de-conned to 10Kdpm/100cm2 average. • Summary of Radiological significance • Initial survey 100 to 700 mRad/hr/100cm2 on cavity floor. • Initial de-con effort reduced the contamination levels to 400Kdpm/100cm2. • The 2nd De-con effort (mopping of the trough) achieved our goal <100kdpm/100cm2. • A rough estimated of 1 man hour and 100mRem was saved.

  3. Conclusion: Westinghouse experienced no personal contamination events during the RX Head tensioning. This was due to reduced contamination levels at the flange and trough area. 2RF08 Cavity de-con was noted by management as excellent. RWST (cavity water) PEAK ENERGY DECAY CORR ISOTOPE ENERGY DIFF (KEV) uCi/ML -------- ------- ---------- ---------- CR-51 320.07 -0.06 1.708E-03 MN-54 834.81 -0.18 3.497E-05 CO-57 122.07 0.24 5.963E-06 CO-58 810.75 -0.09 2.001E-03 FE-59 1099.22 0.26 5.285E-05 CO-60 1332.51 0.08 1.006E-04 ZN-65 1115.52 0.18 7.982E-06 NB-95 765.82 -0.17 1.670E-04 ZR-95 756.72 -0.17 1.140E-04 ------ --------- AVG ENERGY DIFF = 0.01 4.192E-03 = TOTAL GAMMA ACTIVITY

  4. Test results: Dura-Solution vs Detergent 8 150K – 1st decon 200K – 200K 2st decon 3st decon 35K-40K 4st decon-Effect solution Subject matter: Stainless steel, Fuel Handling Load Guide Assembly Post outage decontamination Beginning Contamination Levels = 200K dpm/100cm2 In this corner Detergent 8 In this corner Dura-Solution Results dpm/100cm2 Results dpm/100cm2 1st decon 30K - 40K 2st decon 15K - 20K Note: Dose rate on rags 3-5 mR/hr Round 1 Time in motion study. Deconing to 30K Detergent 8 4 Rag + 4 Decons = Rad Waste Increase Dura-Solution 1 Rag + 1 Decon = Rad Waste Reduction

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