ML20084U925
| ML20084U925 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, 05000000 |
| Issue date: | 02/10/1975 |
| From: | COMMONWEALTH EDISON CO. |
| To: | Case E Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20084U927 | List: |
| References | |
| NUDOCS 8306290644 | |
| Download: ML20084U925 (1) | |
Text
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February 10,.1975 c
/ 'x Ns Mr. ':1. A n G. Case Act: ing D i. rector
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Diroctorate of r, ice 1s ing jq.
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unir b gul tim y c ai. ;i on
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Dre; den a nd Q u ad --C i t-i., s SLition Reac t or Wat er Ree i r< ni] a t i.on 4 - T :n:h Diameter Piping Crack I nye ; t i.g,: t i on Program, NRC_Dkts. 50-237, 50-249, k
750'Ti54 and 50-265-.7 l ;
Dear "; r. Case:
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In confor;wnce with commitments in a letter to you dated Oc te' r 21, 1974 concerning thi.s subject, attached are reports of o sults of the inv e s t i.g a t i.on s completed to date.
The one exception
- i. s t.he n:'ecal F: lect ric co,
iy r.3 port <;hich is bei.:g orinted and j
till be sut.nitted by the <.nd of this onth.
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The conclus ions of the attached reports are that the mecheaism L-!@,Uc 4 of cracking is stress assisted corrosion and that certain further
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j investigation should be considered.
On the basis of the ne conclu; ions, C '
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the following corrective actions and further investigations have
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been undertaken.
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Corrective Actions
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As discussed in a letter to you dated December 27, 1974, all
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the bypass lines will be replaced.
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(a)
Dresden Unit 2 and Quad-Cities Units 1 and 2 during
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the current outages.
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(b)
Dresden Unit 3 during the next refueling outage.
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Operate with the bypass valve normally open.
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