ML102980106
| ML102980106 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 04/26/2010 |
| From: | Richard Ennis Office of Nuclear Reactor Regulation |
| To: | Arthur Burritt, Conte R, O'Hara T Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2010-0334 | |
| Download: ML102980106 (3) | |
Text
(NYC Burritt, Arthur From:
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To:
Cc:
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Subject:
Ennis, Rick Monday, April 26, 2010 8:01 AM Conte, Richard; OHara, Timothy; Burritt, Arthur; Cline, Leonard; Schroeder, Daniel; Balian, Harry Klein, Paul FW: Salem Update Outside of Scope From: Lupold, Timothy To: Evans, Michele;. Rosenberg, Stacey Cc: Taylor, Robert; Yoder, Matthew
,Inforrmaton in this record was ciei4.f trn S a{*o~da, nce with the Frfe.tom o0"!,
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Sent Fri, Apr* 16 15:41:22 2010 ubject:.Salem Update.
Out~side of Scope
- 1) Update - SalemnUnit1 Outage - AFW (headers 12 and 14) buried piping.Issues S.Based on UT results from the shallow section of the Unit 1 buried AFW piping for headers 12 and 14 (headers 11 and 13 arenot
- luried),th licensee currentlyplans to replace a combined total:of approximately 50 feet of piping on the shallow buried, portion of, these two head~ers, (depth of approx, 4 ft). The licensee is using a contractor to perform a finite element analysis to confirm the structural integrity of the rest of the ishallow piping. The* e results*will then be used :to finalize the licensee's determinationmof past operability for the shallow piping andto identify the need for additional corrective actions related to any extent of condition on.the operating unit, UnitUn2.
To this point the licensee has-confirmed reasonable assurance of operability for.the Unit 2 AEW system based on historical information and photographs from 1994 that providedlindication of intact pipe coating and the fact that Unit 2 is about 2.years younger than Unit,1. The licensee currently believes that the shallow section of
- piping on Unit 1 -was not coated "as specified" -by the design.
The operability evaluation for the shallow section of piping that Will be based on the finite element analysis is expected to be completed early the week of 4/19.
On the deep section of piping for headers 12 and 14, the licensee has excavated a small portion of the down
'com*r*that leads to the. deeper piping. They performed ultrasonic testing (UT) around the elbow at the top of this down corner (depth of approx 4 ft), which was completely submerged in groundwater. The minimum Wall thickness measured in this area was -0.226 inches, which was greater than the minimum required wall thickness of 0.200. inches. In addition the license performed a guided wave pipe inspection.on a portion of the straight run of.the deep section of piping (approximately 20 ft in length at a depth of approx. 17 ft). The results indicated less wall thinning on this section of piping tehan the guided wave results indicated for the.
shallow section of piping. The licensee also confirmed by visual observation that the deep section of AFW piping was coated in accordance with the design specification.
Based on the results of the UT around the elbow and the results of the guided wave in the'20 ft section of deep piping, the. licensee plans no further excavation of the deep section of piping. The licensee's current plan are to recoat all of the piping exposed during excavation that will not be replaced, in both the shallow and deep sections anidthen following the compiletion of pipe replacements for the significantly degradedexposed pipe sectionshyd**r6the entire line, both the shallow,and deep sections. The licensee will use these.hydro results to support operability of the deep section of piping for the next operating cycle.
To facilitate;completion of the operability determinations for both the shallow and deep section of piping; the licensee will also be reducing the design pressure of the AFW piping from a very conservative 1900 psig down to a more realistic 1275 psig: through a plant modification package.
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Region-1 has an ISI inspector onsite as part of normal baseline inspection activities and he is reviewing the licensee's analysis. Additional resources from headquarters are assisting as needed. (Continue to follow, forward to TRG Lead for Auxiliary Feedwater (Stan Gardocki), Buried Piping POC (Bob Hardies): assigned to Bob Bernardo).
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