ML102950543
| ML102950543 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 04/12/2010 |
| From: | - No Known Affiliation |
| To: | Office of Information Services |
| References | |
| FOIA/PA-2010-0334 | |
| Download: ML102950543 (3) | |
Text
'A NOTE: THIS
SUMMARY
IS OFFICIAL USE ONLY
- MAY CONTAIN..SENSITIV PROPRIETARY OR NRC INTERNAL USE
-NLY I FORMATION***
DO NOT FORWARD ANY PORTION OUTSIDE OF NRC WIT FIRST OBTAINING PERMISSI FROM ORIGIN IOEB Clearinghouse Screening Summary for Monday, April 12, 2010
[Note - The information in this part of the Summary is often preliminary in nature and is provided to help lOEB staff communicate and track noteworthy items being followed up by either the Regions or HQ staff]
- 2) Update - Salem - AFW buried piping Issues The licensee has decided to replace the approximately 150' of AFW piping on Salem Unit 1 (currently in a refueling outage) that is relatively shallow (< 5 feet) and has been determined to be degraded. The licensee is doing a finite element analysis to evaluate the structural integrity of the piping. The licensee is also evaluating other AFW piping that is buried deeper and is more difficult to access.
In addition, the licensee is performing an operability determination to assess the operability of the Unit 2 piping and to look at Unit 1's operability over the last cycle. The licensee's preliminary analysis indicated that this was not an immediate safety concern on Unit 2 based on previous data indicating that Unit 2 piping had less degradation than Unit 1 piping. The Region 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 (S. Gardocki), Buried Pipingq POC (B. Hardies): assigned to Mike Brown)
NOT:-THIS SUM ARY IS OFFICIAL USE 0
- MAY CONTAINENSITIVEI PR PRIETARY OR NRC ERNAL USE ONLY 7
INFO MATION**
DO NOT FO, RI?ý D ANY PORTIONS OU RC WITHOUT FIRST OBTAINING PERMISSION FROM ORIGINATOR IOEB Clearinghouse Screening Summary for Monday, April ??, 2010
- 1) Update - Salem Unit I Outage - AFW (headers 12 and 14) buried piping Issues Based on UT results from the shallow section of the Unit 1 buried AFW piping for headers 12 and 14 (headers 11 and 13 are not buried), the licensee currently plans to replace a combined total of approximately 50 feet of piping on the shallow buried portion of these two headers (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 shallow piping. These results will then be used to finalize the licensee's determination of past operability for the shallow piping and to identify the need for additional corrective actions related to any extent of condition on the operating unit, Unit 2.
Information In this record was deleted In accordan'ce w h th,* Froed*om of hQormatton Act Exeptons
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0
To this point the licensee has confirmed reasonable assurance of operability for the Unit 2 AFW system based on historical information and photographs from 1994 that provided indication 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 comer that leads to the deeper piping. They performed ultrasonic testing (UT) around the elbow at the top of this down comer (depth of approx 4 ft), which was com*Mete/y 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 licensee 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 than 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 plans are to recoat all of the piping exposed during excavation that will not be replaced, in both the shallow and deep sections, and then following the completion of pipe replacements for the significantly degraded exposed pipe sections, hydro the 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.
Region-1 has an ISl 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).
NOTE: THI MMARY IS OFFICIAL USE ONLY
~INFORATION***
DO NOT FORWARD ANY PORTIONS OUTS WITHOUT FIRST OBTAINING PERMISSION FROM ORIGINATOR Q.EB Clearinahouse Screeninq Summary for Monday, April 19, 2010 uutside Of,cope
NOTE: TH MMARY IS OFFICIAL USE ONLY
- MAY CONTAIN SSITIVE!
OPRIETARY OR NRC INTERNA NLY
,/
INF RMATION***
DO NOT FORW ANY PORTIONS 0 TSIDE OF NRC OUT FIRST OBTAINING PERMISSION OM ORI OR lOEB Clearinghouse Screening Summary for Monday, April 26, 2010
- 3) Update Salem 1 - AFW Piping Issues - (underground pipe degradation issues)
The licensee completed their Finite Element Analysis (FEA) over the weekend. The FEA demonstrated AFW structural integrity for the licensee. The Region has engaged NRR Component Integrity Division to assist in the review the FEA. The licensee is finishing up welds in the deeper section of the trench and expects to complete the repairs today and enter Mode
- 3. The licensee has finished replacing all of the shallow sections of the AFW piping and has re-routed the deeper sections of the piping to be above ground. (Forward to TRG for AFW; S.
Gardocki, Materials; Keith Hoffman and Underground piping contact, Bob Hardies - assigned to Mike Brown).
- 4) Salem 2 - AFW Operability review The licensee determined last week that they had not performed the required testing to demonstrate AFW operability. They performed an initial risk assessment allowed by their technical specifications which allowed them 7-days to perform a more comprehensive assessment. On Friday, the licensee completed their more comprehensive assessment that demonstrates continued AFW operability for 1 year (related to the underground pipe degradation concerns). The Region is reviewing the revised risk assessment. (Forward info to TRG for AFW; Stanley Gardocki - assigned to Mike Brown).