ML12331A178
| ML12331A178 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 11/26/2012 |
| From: | Duke Energy Carolinas, NGG Holdings |
| To: | Billoch-Colon A T Plant Licensing Branch II |
| Billoch, Araceli | |
| Shared Package | |
| ML12331A170 | List: |
| References | |
| Download: ML12331A178 (25) | |
Text
H.B. Robinson Unit 2GSI-191 Strainer Fiber Bypass Test PlanNovember 26, 2012REV. 1 RNP Strainer Fiber Bypass Test PlanIntroductionsDukeEnercon AliAli onNRC PurposePurposePresent draft H. B. Robinson debris preparation and bypass test plan for NRC review and comment.
pREV. 1 Slide 2 RNP Strainer Fiber Bypass Test Plan RNP GSI-191 Project StatusSump was modified in 2007Strainer Bypass determined in 2007SllfGL200402iddi2008S upp l ementa l response f or GL 2004-02 prov id e d i n 2008Chemical Effects Testing was completed in 2010InvesselDownstreamEffectsisonlyremainingRAIIn-vessel Downstream Effects is only remaining RAICurrent Fiber load is 34.5 g/FAMore p rotot ypical test conditions ex pected to reduce the b yp ass pyppyp amount. REV. 1 Slide 3 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test ConfigurationFour Prototype Top Hat StrainersTop Hat located horizontally in test tankGilddfi llG aps i nc l u d e d to represent fi t-up a ll owancesDeionizedwaterFlowratemanuallycontrolledforapproachvelocityFlow rate manually controlled for approach velocityFiber settlement in stagnant areas prevented without disturbing debris bedBypassed debris will be captured in 5 micron filter bagsREV. 1 Slide 4 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test Procedure -Debris PreparationNukon fiber prepared in accordance with NEI ZOI Fibrous Debris Preparation Procedure, Revision 1 (January 2012)TestprocedureissimilartoCrystalRiver
'sTest procedure is similar to Crystal RiversNRC Comments on CR3's plan will be incorporated into the RNP
planThe significant differences between RNP and CR3 are:Approach VelocityPumps stopped and restarted at RNPREV. 1 Slide 5 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test Procedure -Approach VelocityScreens are arranged with two parallel areas.Approx 1/3 of total area is inside the pump bay (inner screen)Approx 2/3 of total area is outside the pump bay (outer screen)When the screens are clean, there is highly non-uniform flow through the top hats along the length of the plenum. Screens closest to the sump have the highest flows. With clean screens the majority of the screen area has very low approach velocities (>65% of top hats have velocities less than did40%lh01Xdi) d es i gn an d >40% are l ess t h an 0.1X d es i gn)Approach velocity for the bypass test will be based on the rmsof
velocity of the top hats.REV. 1 Slide 6 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test Procedure -Approach Velocity (Cont)CleanScreenApproachVelocityRatio 9.00 Clean Screen Approach Velocity RatioRelative to Design Velocity of 0.002 ft/s300 4.00 5.00 6.00 7.00 8.00 elocity Ratio 0.00 1.00 2.00 3.00 1 3 5 7 9 11 13 15 17 19 21 23 V e 19 21 23 25 27 29 31 33 35 37 39 41 43 Top Hat Location Outer ScreensInner ScreensREV. 1 Slide 7 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test Procedure -Approach Velocity (cont)The clean screen approach velocities range from 0.000 ft/s to 0.017 ft/s (0X to 8.5X design of 0.002 ft/s).Root Mean Squared (RMS) average of entire clean screen approach velocities = 1.9X Design RMS Mean velocity approaches 1X design as debris is deposited and flow redistributes causing velocities to increase over a larger area.
Peak velocities are lower, but more area is exposed to the higher velocities velocities
.Informational hydraulic modeling indicates the RMS mean velocity approaches1Xinmuchlessthan1pool turnover approaches 1X in much less than 1 pool turnover.REV. 1 Slide 8 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test Procedure -Approach Velocity (cont)RMSAverageofCleanScreenVelocityRatios 2 RMS Average of Clean Screen Velocity Ratios 1 1.5/0.002 ft/s) 0.5 Ratio (V/000.10.20.30.40.50.60.70.80.91Pool TurnoversEntireScreen Entire ScreenREV. 1 Slide 9 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test Procedure -Approach Velocity (cont)Initial clean screen high velocities are short lived (much less than 1 pool turnover) and limited to small portions of the screen.The bypass test will be conducted at an initial constant velocity of 1.5X design approach velocity. This value exceeds the RMS average velocity of clean screen velocities for all but the first fraction of a pool turnover, exceeds >65%
of clean screen velocities by a factor of over 1.5 and >40% by a factor f15 o f over 15.Once a debris bed is verified, the flow will be reduced to 1X Design.REV. 1 Slide 10 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test Procedure -Pump Stop/RestartAftitl11hlltddthtAfter approx i ma t e l y 11 h ours, a ll pumps are s t oppe d an d th e sys t em is aligned in piggyback mode (RHR pump in series with the SI pump) for hot leg injection via an SI pump.After restart, if all necessary equipment is available, simultaneous hot leg injection via the SI pumps will continue and cold leg injection via RHRmaybeestablishedwithoutinterruptingflowfromthesump RHR may be established without interrupting flow from the sump. If not available, after an additional 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> all pumps are stopped
a g ain and reali gned for cold le g in jection via the SI pumps. The gggjalignment is swapped between hot and cold leg every 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> thereafter
.REV. 1 Slide 11 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test Procedure -Pump Stop/Restart (cont)Bypass testing will be tested for a minimum period of 11 hours1.273148e-4 days <br />0.00306 hours <br />1.818783e-5 weeks <br />4.1855e-6 months <br />. After which, the pumps will be stopped for 6 minutes(maximumanalyzedtime)thenrestartedto minutes (maximum analyzed time) then restarted to simulate switchover to hot leg injection.FlowwillbereestablishedbasedonthehotleginjectionFlow will be re-established based on the hot leg injection (>0.17X design approach velocity (0.00035 ft/s)) and bypass m easu r ed. Fl o w will be m a in ta in ed in t hi s bypasseasuedobeataedtscondition until the stabilization criteria is reached.REV. 1 Slide 12 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test Procedure -Pump Stop/Restart (cont
)Measured bypass following the pump restart will be used to determine bypass following each of the multiple alignments to hot then cold leg injection.REV. 1 Slide 13 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test Procedure -Acceptance CriteriaStabilization CriteriaAt least 5 pool turnovers after each debris additionFilterbagwillbeswitchedoutaftereachdebrisadditionFilter bag will be switched out after each debris additionMinimum of 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> of recirculation after last debris addition additionAnd minimum of 11 hours1.273148e-4 days <br />0.00306 hours <br />1.818783e-5 weeks <br />4.1855e-6 months <br /> of total test time. Corresponds to time to switchover to hot leg injection.Filter bags switched out every 30 minutes during the first 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />sFilter bags switched out every hour after the first 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />sTwoconsecutivefilterbagsmustappearcleanTwo consecutive filter bags must appear cleanREV. 1 Slide 14 RNP Strainer Fiber Bypass Test PlanRNP Bypass Test ScheduleProbable bypass test date is for week of Jan. 28, 2012, at Alion'stest facility in Chicago, IllinoisExact day(s) to be determinedREV. 1 Slide 15 RNP Strainer Fiber Bypass Test PlanQuestions?REV. 1 Slide 16 RNP Strainer Fiber Bypass Test PlanAction Items:REV. 1 Slide 17 RNP Strainer Fiber Bypass Test PlanPublic comments?REV. 1 Slide 18