ML102950561

Branch 3 Daily Status

ML102950561
Person / Time
Site:	Salem
Issue date:	04/13/2010
From:	NRC Region 1
To:
References
FOIA/PA-2010-0334
Download: ML102950561 (5)

Text

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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 better condition; documentation.exists that proves the piping was opened and inspected -10 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%,ofr the yield stress). DRS was providedaccess to the available information and completed its review. There are no immrediate 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.

o Control air small leak. PSEG cut out and replaced. Will evaluate the failure mechanism (believe it was -I I

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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 4/14 at 0730 SShallow pipe UTs (1"x V"examination grid) on hol due to incesn ro~ugh pipe surface conditions in the remaining 9of the 28 sections. Will~ be grinding to prepare surfaces for the UTs.~Hope to complete UTs by end of 4/14.

Finite element analysis expected to be completed 4114 but is dependent uponcompletion of UTs;Tie !EA will be used to ~support bases for past operability of Unit 1,cycle operab~ility of'Unit 1,and to determine need for addJition~al review of the pipe condition at Unit 2

• Acceptabie boun~ding analysis using 0.'152 thickness at 1275 psig for Unit I.'

• Evaluation ofdeesection of pipe completed - do not anticdpate any piping Irepacernmentsminthisarea:

UTs were completed around one elbow in deep section, Thinnest UT measurement-in this area was O.226 Sycle operability requirement was 0.200".

• % Guidedi wave measurements for 20 ft of the deep straight run are better'thah the originalguided wave results for the shallow pipe guided wave measurements. (30% wallloss vs.40% wall loss) xcavated to a level below the ground water and identified that piping was coated. Areas of pipe above tW illp peo hydrostatic test of,the entire length of-pipe-,d eep.and shallow-sections:*-toverifystru ctural e integrity.

Engineering Director/ Plant Manager/Site VP to discuss repai options at 11:00 am today(4/14).

Outside of Scope

Outside of Scope of

.Additional Additional Items (

m 1Status Board Items:

F *Salem Outside AFW buried piping (PRIORITY)

Outside of Scope

Outside of Scope tside Scope