ML19319A925
| ML19319A925 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 01/28/1977 |
| From: | Shao L Office of Nuclear Reactor Regulation |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7912300196 | |
| Download: ML19319A925 (4) | |
Text
_ _ _ _
.g JAN 2 81977
[
D. Eisenhut, Assistaot Director for Operational MEMORANDUM FOR:
Technology, Division of Operating Reactors t.. Chao, Chief. Engineering Branch. Division of FROM:
Operating Reactors OCONEE UNITS 1, 2 & 3 STEAM GENERATOR TUBE 1.EAK i
SUBJECT:
INCIDEilTS i
25, 1977, and as a follow-This is to respond to your note of Jannary 16,1976, regarding the subject up to my note to you dated DecemberWe have been in constant cont follow the progress of B&W's investigation into the cause of theseF matter.
Following is a su::
reported tube fatiures.
y to us to date:
Attached Figure 1 and Table 1 give the locations of all failed
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tubes that either caused leaks already or were found 1.
cracked.
tube sheets or at support plates.
direction and near the uppi a
Information obtained from two informal sources 2.
The top steam outlet side cracks caused by flow induced vibration.
was the region where the maximum steam' cross flow velocity w lfsthis failure mechanism were to be confimed by the licensee or their HSSS. It would be serious because it could indi in;;dequacy of the support system.
j Prior to the tube leal !ncidents at Units 1 & 2 on 12/4/76 12/9/76, respectively, the licensee had infomed us that the crack 3.
could be attributed to random manufacturing defects.
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Thera is only one tube that was renoved la steasa generator 28T t
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(unit 2 SG B; for laboratory examination.
reported the results of the laboratory examination to us.
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We have requested through Don Neighbors that the licensee elaborate ontheun-confirmedreports-(Item (2)). We have also requested
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that D.' Neighbors arrange a meeting with the licensee on the subject.
L.-Shao, Chief l
Engineering Branch Division of Operating Reactors i
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Enclosures:
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As stated DISTRIBUTION:
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V. Stello, Jr., DDR r,entral Files 4
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OTSG TUBE IDENTIFICATION PLAN-VIEW
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. TABLE'l' OCONEE OTSG TUBE EXPCRIENCE STEAM GE OR,._
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TUBE ELEVATIO3 DATE LANC TUDE CONDITION DESIGNATION.
TUEE trAg
' A
-77 17 lubcsheet 11/76 Yes Yes Crack 1-B 114 109 14thPiate 12/76 No Yes No Visual inspecticn 1-B 113 -
110 14th Plate 12/76 Nc No Similar to 114/109 1-B 75 18 Tubtsheet 12/76 Yes.
No 300* Crack 2-B 77 23.
Tubeshoot 12/76 Yes Yes 270* Crack, llole.
2-8 77 27 15th Plate 12/76 Yes yo Wear Appear-2, ance 2-8 124 42 12th Plate' 12/76 No No Eddy Current
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Indication.
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r 40-60 3-B 77
. 11 15th. Plate 7/76 Yes yoS No Visual
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