ML102950560
| ML102950560 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 04/13/2010 |
| From: | NRC Region 1 |
| To: | |
| References | |
| FOIA/PA-2010-0334 | |
| Download: ML102950560 (4) | |
Text
Outside o BRANCH 3 DAILY STATUS
_'J 4/13M10 4
Highlighted items were discussed at DRPIDRS Coordination meeting BOLD items are new SOUtside of Scope
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.. 013 01utfd olSope 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 and found 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 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.
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.
I o
No recorded inspections of Unit 1 AFW piping
-I S infomiaton in this record was deleted in accordance with the Free omrn of Iformatio A.
Exem~ptions O(-c-&fda 5'C_)4;0 I"
FOMPA P_ to,
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).
Upldatei as4 12:at 3:O M
80int f
Ieet of salwpipe 25%/ UTs complefe; 1",x 1 exanmination matrix; shbOuld be *t""o'MPleýte by end o~f4ib~
analysis to be completed4/14;/1 wi!llprovide bases forpast operability ofinit 1 and will I;e u§00 to determine need for additiona review base fope pasdtio atr~Iiy.o Unit 2
n ul e S~Acceptable bounding analysis using 0.152 thickness at1275+ psig for tUnit 1.
Currently performing guide wave odeep pie Outside of Scope
3/4 Outside of Scope Additiohal Items, Status Board Items:
-,,-Salem AFW buried piping (PRIORITY)
-L AOutside of Scope
Outside of Sbope