ML20129C282
| ML20129C282 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 05/29/1985 |
| From: | Rybak B COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 0178K, 178K, NUDOCS 8506050459 | |
| Download: ML20129C282 (2) | |
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Commonwealth Edison One First National Plaza Chicago, Ilknois Address Reply to: Post Office Box 767 Chicago, Illinois 60690 May 29, 1985 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commistica Washington, DC 20555
Subject:
Quad Cities Station Unit 2 Supplemental Information on Use of GE Advanced Control Blades NRC Docket No. 50-265 References (a):
B. Rybak letter to H. R. Denton dated October 2, 1984.
(b): GE NEDE 22290 - Safety Evaluation of the GE Hybrid I Control Rod Assembly.
Dear Mr. Denton:
As noted in Reference (a), it is Commonwealth Edison's intent to install control rod blades using hafnium in upcoming outages for its Dresden and Quad Cities units. Members of your staff required specific information as to the number and type of control rod blades to be installed at Quad Cities Unit 2 during its current refueling outage. The purpose of this letter is to provide that information.
The control rod blades to be used are what GE calls their Advanced Longer Life Control Rod design (ALLCR). This design is an extension of the Hybrid I Control Rod design (HICR) previously approved by the NRC. The significant differences between the HICR and ALLCR designs are:
A 6 inch long hafnium absorber plate is added to the top of each blade wing.
- A new lightweight velocity limiter is incorporated to offset the slightly higher weight of the hafnium absorber plates.
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7 H. R. Denton May 29, 1985 General Electric has provided detailed information on the ALLCR design in Supplement 2 to NEDE 22290 (reference (b)).
Specific information on the lattice design for plants such as Quad Cities Unit 2 is contained in Section 2.1 as well as other sections of that supplement.
If-you have any further questions regarding this matter, please contact this office.
. One signed original and forty (40) copies of this letter is.
provided for your use.
Very truly yours, 6
B. Ryb' Nuclear Licensing Administrator 1m cc:
R. Bevan - NRR NRC Resident Inspector - Quad Cities G. N. Wright - State of IL 0178K o