ML102950450
| ML102950450 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 04/17/2010 |
| From: | O'Hara T NRC Region 1 |
| To: | Balian H, Arthur Burritt, Conte R, Daniel Schroeder NRC Region 1 |
| References | |
| FOIA/PA-2010-0334 | |
| Download: ML102950450 (3) | |
Text
Schroeder, Daniel From:
OHara, Timothy Sent:
Saturday, April 17, 2010 4:57 PM To:
Conte, Richard; Burritt, Arthur; Schroeder, Daniel; Gray, Harold; Balian, Harry Cc:
Lupold, Timothy; Wilson-' Peter; Roberts, Beverly
Subject:
RESPONSE TO: FW: Some thoughts on Salem 1 Before I forget
- Rich, Here are my comments/opinions in red below.
Tim OHara From: Conte, Richard Sent: Saturday, April 17, 2010 7:49 AM To: Burritt, Arthur; Schroeder, Daniel; OHara, Timothy; Gray, Harold Cc: Lupold, Timothy; Wilson, Peter; Roberts, Darrell
Subject:
Some thoughts on Salem 1 Before I forget AFW Pipe Degradation (all subject to an adequate hydrostatic pressure on new design pressure):
- 1. I think we are ok on extent of condition pending root cause documentation, which will include extent of condition, but with after-startup documentation - one exception is the control air leak in the fuel handling building and the implications to how much or how little is known about the deep piping in the FHB.
- 2. I think we are ok with the repairs in the yard and trench area pending the tech eval on reduced design pressure and FEA on the remaining degraded but acceptable piping above new min wall.
- 3. Past operability will be developed later with additional characterization of replaced pipe but in the shop.
- 4. Pending the operability review for this temporary repair to support the next cycle, the assessment of conditions of the deep pipe in the FHB appears weak or inadequate Questions:
- a. Wwith what they have done to date and with a SAT hydro and with the knowledge of the control air leak due to mech damage on the coating, will they be code compliant or not --- most likely it will be subject to interpretation?)
PSEG needs to show that all the AFW buried piping will have structural integrity until their next outage which will be 18 months after return to power. The FEA and *hydro will, p6ovide that assurance for all the, piping which was replaced and for all the piping which was coroded but subsequently UT'd to demonstrate sufficientwall J
thickness (plus corrosion allowance) for 18 months. We will need to review all of this and make sure they show they meet it.
- b. Did they say that they will go done as far as they get intact coating (or coating in good condition - subject to be surrounded by wetted sandO in application of coating in the upper portion Of the riser section?
My understanding is they are doing no more excavation and no more UT's. Here are the facts which are of concern to me with the buried piping in the FHB:
(1) there are no UT readings (and will not be any) on the buried piping in the FHB
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(2) the buried piping (approximately 50 ft.) has received less than complete coverage with Guided Wave (not that this would tell much about the actual pipe condition)
(3) there is no positive ID that the buried piping in the FHB is actually coated, there are no QC records to show this either (4) the retrieved fragment of coating which was retrieved from the deepest excavation (a couple of feet) point on the vertical section of one of the AFW headers in the FHB had already deteriorated to the point where it spawled off of the pipe, and did not appear to be able to provide much protection in the condition I saw it (5) PSEG does not know what the coating fragment was, doesn't know when it was put on the pipe, and doesn't know what the lifetime of the coating was when, and if, it was applied or how long it might be good if it is there (6) early in this AFW episode, PSEG speculated that the piping was coated but had failed, now PSEG's judgement is that there was no coating applied in the trench - in spite of the fact that the original spec. says that all buried piping is to be coated (7) PSEG has no soil chemistry data to make a case that the soil/sand in the FHB area is any better (i.e. less corrosive) that the environment was in the trench outside the FHB (8) it is very apparent that when it rains, the sand gets wet in the FHB, PSEG doesn't understand this yet For these reasons, I don't understand how PSEG will provide a convincing argument that the.FHB buried piping, even after a sucessful hydro, will maintain structural integrity for the next 18 months. Corrosion rates, conservative or not, linear or not, don't tell us anything when you don't know the pipe thickness you are starting from! The piping is in a corrosive environment, may not be coated, and there are no qualified wall thickness measurements!
- c. Is there really an effort to look for as installed information or design information on the coating in the two areas? d. What will it tell us and What won't it tell us.
About 2 weeks ago, I asked for the information to check on this. To date we've not received anything to review. It would tell us that the coating was installed and how long it should have been good for.
There are many other information requests which have not been provided yet. I am getting the feeling that some of the requested information will not be provided. I can't say they are not looking for it because they say they are.
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[Outside of Scope 3