ML100630040
| ML100630040 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 03/03/2010 |
| From: | Mahesh Chawla Plant Licensing Branch III |
| To: | Patricia Anderson, Dotson B, Kuemin J Entergy Nuclear Operations |
| Chawla M, NRR/DORL, 415-8371 | |
| References | |
| TAC ME2475 | |
| Download: ML100630040 (3) | |
Text
From:
Chawla, Mahesh Sent:
Wednesday, March 03, 2010 5:08 PM To:
KUEMIN, JAMES L; DOTSON, BARBARA E; Anderson, Paula Cc:
Taylor, Robert; Pascarelli, Robert; Johnson, Andrew; Karwoski, Kenneth
Subject:
Palisades - 2009 Steam Generator Tube Inspection Report - ME 2475 -
Request for Additional Information By letter dated October 22, 2009 (Agencywide Documents Access and Management System (ADAMS) Accession No.: ML092950525), Entergy Nuclear Operations, Inc. (the licensee) submitted information pertaining to their 2009 steam generator tube inspections at the Palisades Nuclear Plant. Additional details of these inspections are documented in a conference call summary letter dated May 7, 2009 (ADAMS Accession No.: ML091060762). In order to complete its review, the staff needs the following additional information:
- 1. Table 5 lists the tube in row 2 column 57, in SG B, as being plugged due to a single axial indication of primary water stress corrosion; however, this tube is not listed in either Table 6A or 6C. Please clarify and confirm that all service-induced indications are reported in Tables 6A, 6B, and 6C. Please discuss the size of this indication and the previous inspection results for this tube. Please clarify the nature of this indication since Table 4 implies that an outside diameter stress corrosion crack indication was detected in the U-bend region and Table 5 indicates a primary water stress corrosion crack was detected (assuming these Tables are referencing the same indication/tube).
- 2. Please discuss whether any tube-to-tube wear indications were detected during the 2009 outage.
- 3. Two indications associated with dings were detected. Please discuss the size (voltages) of these dings and discuss how these indications were initially reported (i.e., with the bobbin coil, rotating coil, or both). If the voltage of the dings is near five volts, discuss your basis for not performing additional rotating probe inspections at dings less than five volts (given that circumferentially oriented flaws may also occur at dings).
- 4. It was indicated that, leakage did not exceed the 0.3 gallon per minute limit. Please clarify whether the leakage being referred to was the calculated accident induced leakage. In addition, please clarify the statement that, no leakage was predicted for the 2007 to 2009 operating cycle. Is this operating or accident-induced leakage?
- 5. During the 2007 outage, two tubes were plugged due to a loose part at the eighth cold-leg tube support (R129C108 and R128C109). Only one of these tubes was stabilized. Please discuss whether any indications were detected on the tubes surrounding the location of the loose part.
- 6. A few axial stress corrosion cracking indications were identified at the tube supports. One of these indications grew from non-detectable to a size that required in-situ pressure testing.
Please clarify whether it was reported as a flaw or an I-code. Did both analysts report this indication? If not, discuss any implications. Did either analysts team use automatic data screening?
Please arrange a teleconference to discuss the above information with the NRC staff.
Mahesh Chawla Phone: 301-415-8371 Fax: 301-415-1222 mahesh.chawla@nrc.gov E-mail Properties Mail Envelope Properties ()
Subject:
Palisades - 2009 Steam Generator Tube Inspection Report - ME 2475 -
Request for Additional Information Sent Date: 3/3/2010 4:59:26 PM Received Date: 3/3/2010 5:08:00 PM From: Chawla, Mahesh Created By: Mahesh.Chawla@nrc.gov Recipients:
jkuemin@entergy.com (KUEMIN, JAMES L)
Tracking Status: None bdotson@entergy.com (DOTSON, BARBARA E)
Tracking Status: None panders@entergy.com (Anderson, Paula)
Tracking Status: None Robert.Taylor@nrc.gov (Taylor, Robert)
Tracking Status: None Robert.Pascarelli@nrc.gov (Pascarelli, Robert)
Tracking Status: None Andrew.Johnson@nrc.gov (Johnson, Andrew)
Tracking Status: None Kenneth.Karwoski@nrc.gov (Karwoski, Kenneth)
Tracking Status: None Post Office:
Files Size Date & Time MESSAGE 16747 3/3/2010 Options Expiration Date:
Priority: olImportanceNormal ReplyRequested: False Return Notification: False
Sensitivity: olNormal Recipients received: