ML093210544

NRC SG Secondary Side Inspections

ML093210544
Person / Time
Site:	Waterford
Issue date:	11/17/2009
From:	Entergy Operations
To:	Plant Licensing Branch IV
Kalyanam N, NRR/DLPM, 415-1480
Shared Package
ML093210496	List: ML093210501 ML093210519 ML093210530 ML093210539 ML093210544
References
Download: ML093210544 (4)

Text

Steam Generator Secondary Side InspectionsFall 2009 Refuel 16 OutagePreliminary ResultsPage 1 of 4 NOECP-257"Steam Generator Secondary Side Inspections"Inspect following areas of SGs for loose parts and evidence of flow accelerated corrosion.area below the steam separator can deckarea around tube supportsarea around feedringarea above the steam separator can deckarea above dryer deckSteam Generator #1 Upper InspectionIssues Discoveredfeedwater distribution box vent fell off (CR-WF3-2009-06504)4 J-nozzles with pin hole in welds (CR-WF3-2009-06622)Actions TakenRetrieved distribution box vent assembly. The J-tube portion of the distribution boxvent had significant flow accelerated corrosion. The T-fitting portion of thedistribution box vent had little to no corrosion.UT 21 of 40 of the 3-1/2 inch diameter J-nozzles (including all with pin holes)Minor wear (nominal thickness 0.318 inch) with the lowest measured UT readingof 0.212 inch.

-Measured wall size ranges from 67% to 135% of original wall; areas ofdegradation are not significantly different from the nominal pipe wall. It canbe concluded that the J-nozzles will be able to perform its intended functionfor the next cycle of operation per Westinghouse Letter LTR-SGDA-09-189UT and boroscope distribution box around vent - showed no signs of significanterosionUT Ring Header between J-nozzlesMinor wear on the 12 inch Ring Header (nominal thickness = 0.4 inch). Thelowest measured UT reading is 0.335 inch.

-Wall size ranges from 83% to 109% of original wall; areas of degradation arenot significantly different from the nominal pipe wall. It can be concludedthat the ring header will be able to perform its intended function for the nextcycle of operation per Westinghouse Letter LTR-SGDA-09-189100% external visual and boroscope interior weld areas of 21 of 40 J-nozzles4 J-nozzles with pin hole in welds. The holes seem to be the result of the weldingprocess. The holes are in the weld material and are generally not biased to eitherthe nozzle or the ring header.

-Per visual inspection the welds are acceptable with respect to Westinghouseletter LTR-SGDA-09-188, which calculated the minimum required weld is Steam Generator Secondary Side InspectionsFall 2009 Refuel 16 OutagePreliminary ResultsPage 2 of 40.017 inch over 270 degrees of the circumference. The minimum rigid basematerial was determined to be 0.020 inches.No signs of significant erosionverification "pull test" of vent weld remnant to ensure not potential loose partNo loose parts identifiedGood weld fusion to distribution boxResolutionsWestinghouse letter LTR-SGDA-09-189 provides the acceptability of SG operationEC-18652 use-as-is evaluation is being preparedSteam Generator #1SG31 Failed Distribution Box Vent Steam Generator Secondary Side InspectionsFall 2009 Refuel 16 OutagePreliminary ResultsPage 3 of 4SG31 J-Tube Nozzle Pin HoleSteam Generator #2 Upper InspectionIssues Discoveredpin hole found in weld of distribution box vent elbow (CR-WF3-2009-06629)Actions TakenUT distribution box and vent / also boroscope inside of distribution box includingback of vent weld connectionThin area of vent line (nominal thickness = 0.300 inch). The lowest measured UTreading is 0.086 inch.Small hole observed in weld of vent elbow

-Westinghouse letter LTR-SGDA-09-188 Rev 1 calculated the minimumrequired weld material to be 0.015 inch over 270 degrees of thecircumference. The minimum rigid base material was determined to be 0.017inches. Therefore, this is acceptable since both the hole in the vent elbowweld and the area of thin wall meet the acceptance criteria.100% visual inspection of J-nozzlesNo areas of degradation observedResolutionsWestinghouse letter LTR-SGDA-09-189 provides the acceptability of SG operationEC-18652 use-as-is evaluation is being prepared Steam Generator Secondary Side InspectionsFall 2009 Refuel 16 OutagePreliminary ResultsPage 4 of 4SG32 Distribution Box Vent