ML19340A961
| ML19340A961 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities  |
| Issue date: | 12/21/1971 |
| From: | Stiede W COMMONWEALTH EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19340A960 | List: |
| References | |
| NUDOCS 8009100882 | |
| Download: ML19340A961 (1) | |
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Commonwealth Edison Company ONE FIRST NATIONAL PLAZA
- CHICAGO. ILLINOIS u*.., n.,i, POST OfflCf 901 747
- CHICAGO, !LLIN005 4049C December 21, 1971 Mr. Boyce H. Grier Regional Director U.S. Atomic Energy Commission Division of Compliance, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Grier:
This is in response to your letter of December 10 in which you informed us of an incident which occurred at Turkey Point 3 during preoperational testing.
In your letter you requested infor-mation concerning the design.of the main steam lines to which safety valves were attached.
The information you requested is listed below:
A - At Dresden Unit 1 the safety valves are not mounted on the steam line.
Safety valves are attached to the primary steam drum.
Thus, your concern with respect to Dresden Unit 1 is not applicable.
B - At Dresden Unit 2 safety valves are attached to the main steam line inside primary containment.
The spool piece to which the safety valves are attached consists of a forged pipe which was manufactured by the Kellog Corporation.
This pipe is A105 Grade 2 carbon steel which has a tensile strength of 70,000 psi and a minimum wall thickness of 1 3/32".
C - The design at Quad-Cities is similar to that at Dresden, with the exception that the spool pieces to which the safety valves are attached are A106 Grade B carbon steel which was manufactured by the Grinnel Corporation.
The pipe size is Schedule 80.
Should you require any additional information, please let me know.
Very truly yours, e.
..[ Q,;n c/.4 N'O'I Wayne L.
Stiede Nuclear Licensing Administrator f
8009100h
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