ML102950405

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Branch 3 Daily Status
ML102950405
Person / Time
Site: Salem PSEG icon.png
Issue date: 04/16/2010
From:
NRC Region 1
To:
References
FOIA/PA-2010-0334
Download: ML102950405 (5)


Text

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4' 4 44 .44 .Z BRANCH Outside of Scope DAILY 4/16/10 STATUS Ii-Highlighted items were discussed at DRPIDRS Coordination meeting Outside of Scope ALI=(9X)>0,07 AL2=(2of3)>0.1 1 AL3=(lX)>0.13 J

,i SALEM ONE I Weekend Coverage: Dan (Sat)/Harry (Sun) i Jutside of Scope AFW Piping Degradation

  • Buried AFW piping to the 12 and 14 S/Gs appears to have significant degradation of the protective coating and piping.

The preliminary guided wave inspection results indicate that the ASME Class 2 piping is degraded below min wall.

The pipe is schedule 80 4" inside diameter carbon steel piping with a coal tar type coating that appears to been hand applied. The piping run of concern involves about 150 ft of pipe that is buried at depths ranging from 4 ft adjacent to the out side of containment to 17 ft deep in a covered area adjacent to the containment.

  • The UT results confirmed the guided wave results. Engineering determined they could not support operability of the piping through the next cycle.

EOC - Unit 2 has greater margin - it is a newer plant and is presumably in bette" condition; documentation exists that proves the piping was opened and inspected -10 years ago and found tobe in pristine condition; ISI code gives more allowance to an operating unit (they can take credit for up to 90% of theyield stress). DRS was provided access to the available information and completed its review. There are no immediate safety concerns.

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.

kh~ifmtion in tnis recwi w6 ciemou in accordance with the Freedom of Inbormadtio Act.

thwnnfi.. C-Ge)IC-'e' FOIAMA _,,z O2 I I I I 04-:

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.

o No recorded inspections of Unit 1 AFW piping 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 need to perform an MC 0309 review).

Update as~ of 4~1f5 at 0730* nwi

.Shallowpipe.UTs (1"x 11"examination grid):.Surface prep was~taking too long so backedout-of UTsS andwill cut out*ny ,sections of the shallow pipe that they did not complete UTs. They will finish UTs on those sections after the pipe' is cut out.

Curenty acomind totalf -80 ft of the shallow piping was cut out and will be replaced on the 12 and,14 AFW headers. The 80 ft included areas wh~ere UT results indicated less than 0.200" thickness and areas that were not UT'd.

  • PSEG expe+ctsthefinite element analysis (FEA)tto+be completedand 3,d party reviewed .on 4119. PSEGiwIll use the FEA results to support past operability for Unit I, cycle operability for Unit anI tOdeterbmined aany need d1, for additional reyiewjof the pipecodlition at Unit2.

PSEG claim+i*tht they.have an acceptable bounding analysis using 0.152" thickness t 1275. psi~fo* Unit 1 and plan toimplement an AFW design change through. 50.59.

section o pipe alsocopleted. PSEG currentlyplans no piping replacementS In this area:

deep .tion'f

>UTs were completed around one elbow in deep section. Thinnest UT measurement in this area was 0.226"

-'Cycle' operability requirement was 0.200"..

GuIded wave measurements for 20 ft of the deep straight run are better than the original guided wave resu the shallow pipe gutided wave measurements. (30% wall loss vs.40% wall loss)

  • ! Excavated to a level below the ground water and identiied tha~tppiing Was coated. Ara of pipe "bove that level are currently uncoated bu rill oepipeabov.

W*ill perform

    • r*tatic test of the, entire, length of;pipe - deep and shallow sections -to veriistructural
  • in~tegrity.

Repair status as of 4116 at 0730

  • 8f,25 welds completed on th~e p"ipnn prpJ"tnfrep eacensn the shlw sectiOn Outside of Scope
  • ~ anmta dn iaa ISWAWIi, hAA~c sh eW.t aenhtke £IJ4YUaU.&%S Mia*JThm n&a~M '~.'ass 2

I Outside of Scope

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Additional Items Status Board Items:

AFW buried ipinq (PRIORITY)

L

)Outside of Scope I-.

  • Outside of Scope, IOutside of Scope