ML20004D397
| ML20004D397 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 06/08/1981 |
| From: | Colbert W DETROIT EDISON CO. |
| To: | Kintner L Office of Nuclear Reactor Regulation |
| References | |
| EF2-53478, NUDOCS 8106090348 | |
| Download: ML20004D397 (3) | |
Text
.
Deholt FNRICO FERMI UNIT 2 PROJECT
() LIQ,j/O ENGINEERING s
g th,, [u L.
i t LUJUN 0 31981* ]j Q ' " e 8, 1981 2
Mr. L. L. Kintner u.s. wucune umroes Division of Proj ect Management k
C"'"***
Office of Nuclear Regulatory Commission 6,
,4g/j 6/ g '"/\\ '
Washington, D. C. 20555 s/
Dear Mr. Kintner:
Reference:
Enrico Fermi Atomic Power Plcnt, Unit 2 NRC Docket No. 50-341 Subj ect:
Supplemental Information on Saf ety Relief Valve (SRV)
Discharge Quencher Design Included with several NRC miscellaneous requests for information, was a request for additional information about the SRV discharge line quencher. The Fermi-2 SRV discharge line quencher design is a "T" configuration device, but the design does not explicitly conform to the design of a " generic T-quencher".
Descriptive in-formation describing the Fermi-2 "T" quencher device is provided in the attachment to this letter.
Should you have any additional questions, please contact Mr. D.F.Lehnert (313-649-7583).
Sincerely, f
)
W.F. Colbert Technical Director Fermi 2 Project DFL/sim
%\\\\
8106 090 JYF A
=
Mr. L. L. Kintner June 8, 1981 EF2-53478 Page 2 bec:
(with attachments)
T. A. Alessi E. L. Alexanderson R. M. Berg J. H. Casiglia W. J. Fahrner F. E. Gregor E. P. Grif fing J. W..Honkala W.'H. Jens A. K. Lim E. Lusis P. A. Marquardy L. E. Schuerman H. Tauber R. A. Vance A. E. Wegele D. F. Lehnert J. W. Nunley Doc. Control T. Martin (NUTECH)
I 1
Comparison of Fermi Quencher Device to Standard Mark-1 Quencher The Fermi quencher geometry differa from a standard Mark-1 quencher geometry in two ways.
The standard device has been de-signed for discharge at mid-bay in a torus segment and therefore, utilizes quencher arms which are in alignment (Straight).
ERV discharge for Fermi is located near torus mitered joints.
Accordingly, the quencher arms are also mitered (offset by 11.25*) so that they align with the longitudinal axes of the adjacent torus segments.
This provides for a symmetrical SRV discharge in the torus segments.
The second difference in the two devices is arm diameter.
The Fermi quencher arms (and ramshead) are 20" in diameter compared to the 12" diameter used in the Mark-1 quencher.
The increased diameter arms have been shown to result in a reduction in SRV discharge loads on the torus and submerged structures.
The Fermi quencher utilizes the same hole pattern parameters (hole diameter, spacing and discharge area) used in the standard Mark-1 quencher device.
_