ML102950452

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Branch 3 Status
ML102950452
Person / Time
Site: Salem PSEG icon.png
Issue date: 04/19/2010
From:
NRC Region 1
To:
References
FOIA/PA-2010-0334
Download: ML102950452 (5)


Text

_Outside of Scope BRANCH 3 DAILY r" STATUS ST U BOLD items are new Outside of Scope f-ALEM ONE:, Weekend Coverage:

AL 1=(9X)>0.10:

Outside of Scope AFW PiDing Degiradation

Background

  • Buried AFW piping to the 12 and 14 S/Gs appears to have significant d The preliminary guided wave inspection results indicatethat the ASME Thepipe is schedule 80 4" inside diameter carbon steel piping with a c applied. The piping run of concern involves about 150 ft of pipe that is the out side of containment to 17 ft deep in a covered area adjacent to kdnfrmnatin in in.accordance with the Fro'orn of Informa!ton Act.Exemptions 5 t'Q-~ssz, ac)n4QS.4119110 tinn UUUI USm .......7 AL2=(2of3)>0.11 AL3=(lX)>0.13 egradation of the protective coating and piping.Class3? piping is degraded bellow minwall.0al tar type coating that appears to been hand buried at depths ranging from 4 ft adjacent to the containment.
  • EOC -Unit 2 has greater margin -it is a newer plant and is presumably in better condition; documentation exists that proves the piping was opened and inspected

-16 years ago andfound to be in pristine condition; ISI code gives more allowance to an operating unit (they can take credit for up to 90% of the yield stress). DRS reviewed photographs and has no immediate safety concerns.

There were no similar inspections of Unit 1 AFW piping.* On each unit there are three safety-related systems with buried piping (ASW, SW and control air)o Control air coating in tact, PSEG will document the inspection.

o Control air small leak. PSEG cut out and replaced.

Will evaluate the failure mechanism (believe it was repeatedly stepped on).o No previous UT inspections for service water piping, previously focused on seals for bell and spigot joints (as of end of outage all will have been replaced).

Based on SW piping OE the current concern would be groundwater corrosion of the metal bands between concrete layers.* PSEG evaluating past operability for Unit, 1 using finite element analysis.

Results will be used to determine if MC 0309 entry conditions are met (if-piping was inop needI to perform an MC 0309 review). PSEG determined they have an acceptable bounding analysis Using 0.152" thickness at 1275 psig for Unit 1 and plan to implement an AFW design change through 50,59, PSEG expects the finite element analysis (FEA) to be completed and 3rd party reviewed on 4/19. PSEG will use the FEA results to support past operability for Unit 1, cycle operability for Unit 1, and to determine any need for additional review of the pipe condition at Unit 2.Update as of 4/1`9 atQ0730* Followiwng replacement of about 80 ft of shallow Piping PSEG removdV tehesupports for the piping that was not~replaced and ide~ntified a section under a pipe supolrt clamp th~at was, well below miinimum~

wall (.077). Based on' the this .d~isco6ove&ýQ pSG~lans to replace all the deep pipe and.,the remainder of the shallow pipe on the 14 hea~der, Questions and Concerns* Design change to support 1275 psig* Unit 2 EOC (operability based on differences)

  • Replacement plan and schedule Information Needs* Finite element analysis* Past operability review for Unit 1* Operability determination for Unit 2* Design records for as installed piping on Unit 1 & 2* Previous ASME required flow or pressure drop tests for Inits 1 & 2 I I r VuLs Iue ulScp Outside of Scope Status Board Items:.Salem AFW buried piping (PRIORITY)

Outside of Scope i1 Outside of Scope