ML20067B154
| ML20067B154 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 12/01/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| SBN-394, NUDOCS 8212060068 | |
| Download: ML20067B154 (5) | |
Text
O O
SEABROM STATION U PUBLIC SERVICE L.p.._i.g Office:
Companyof NewHampshere 1671 Worcester Road Framinoham, Messachusetts 01701 (617) - 872 - 8100 December 1, 1982 SBN -394 T.F. B7.2.3 United States Nuclear Re' ttory Commission Washington, D. C.
20555 Attention:
G. W. Knighton, Chief Licensing Branch No. 3 Division of Licensing
References:
(a) Constraction Permits CPPR-135 and CPPR-136, Docket Nos.
50-443 and 50-444 (b) Seabrook Station Environmental Report - Operating License Stage, as revised
Subject:
Supplemental Information on the Use of Steel H-Frame Structtres along the Seabrook to Newington Transmission Line Right-cf-Way
Dear Sir:
In response to a verbal request by your Mr. L. Wheeler, we are providing the following additional information concerning Applicants use of steel H-frame structures along the Seabrook to Newington transmission line right-of-way, rather than wooden H-frames as mentioned in the Seabrook Station Final Environmental Statement-Construction Permit Stage ( FES-CP ). The reasons for this change in H-frame structural materials were briefly discussed in Applicant's response to ER-OLS RAI 310.2 [ Reference (b)).
Line #369, the 345 kV transmission line t' tat connects Seabrook Staticn to Newington Station, was constructed with 80 ateel tangent structures, rather than those of wood as mentioned in the Seabrook FES-CP.
These stael structures are located at regular intervals along the transmission right-of-way f rom Seabrook to Newington, except for the stretch across the Hampton Marsh and from the Portsmouth Rotary into Newington Station where single steel poles were used as explained in the Seabrook Station FES-CP.
At the time of the CP proceedings, PSNH teutified that wood structures would be used for Seabrook related transmission line construction, and that the alternative to wood was the use of galvanized steel lattice towers. Not only did PSNH believe there was a visual impact advantage to wood over steel Qf O
lattice structures, but the need for concrete foundations for steel was a further environmental disadvantage. Years later, when these transmission line material specifications were being reviewed, it became evident that new concepts in steel structure design, together with the use of weathering steel, permitted further reduction in environmental impact beyond the degree committed. At that time, PSNH felt the change f rom wood to steel was not a 8212060068 821201 PDR ADOCK 05000443 D
o United States Nuclear Regulatory Commission December 1,1982 Attention :
G. W. Knighton Page 2 step backwards, rather it represented an improvement in the overall environmental acceptability of the structures. The advantages of the weathered steel simple H-frame supports over similar structures of wood are as follows :
1.
The use of steel permitted installation of H-frames with less bulk, making the structures appear less massive, hence reducing their visual impact. A comparison of critical dimensions of steel vs.
wood is as follows:
Steel Wood Cypical diameter of poles 14.5 inches 18 inches Dimensions of crossarms 4.5 x 4.5 inches 5.25 x 9.0 inches Height of structure and length of crossarms Same Same 2.
The steel poles were set into the ground just as' wood poles would be, thereby avoiding foundation work.
3.
The life of steel structures is equal to or greater than wood with less maintenance. Wood structures must be inspected periodically and occasionally require ground-line treatment with waod preservatives. Wood pole maintenance would increase the travel over the right-of-way.
4.
The weight of wood structures is about twice that of steel thus construction could be accomplished with smaller, lighter equipment.
5.
The color of the steel structures is very much like that of treated wood, so their appearance is quite similar (see enclosed photos).
In summary, the use of steel for tangent structures on the Seabrook-Newington line was a change from that explained in PSNH's testimony before NBC.
However, it is PSNH's opinion that the change was totally in keeping with the spirit of the commitment to minimize the environmental impact of this transmission line.
This expanded discussion on the use of steel vs. wood H-frame structures on the Seabrook-Newington transmission line will be included in the next revision to the Seabrook Station ER-OLS.
Very truly yours, j
John DeVincentis N Project Manager RAM /fsf Enclosures cc Atomic Safety and Licensing Board Service List
ASLB SERVICE LIST Philip Ahrens, Esquire Assistant Attorney General Department of the Attorney General Augusta, ME 04333 Representative Beverly Hollingworth Coastal Chamber of Commerec 209 Winnacunnet Road Hampton, NH 03842 William S. Jordan, III, Esquire Harmon & Weiss 1725 I Street, N.W.
Suite 506 Washington, DC 20006 E. Tupper Kinder, Esquire Assistant Attorney General Office of the Attorney General 208 State House Annex Concord, NH 03301 s
Robert A. Backus, Esquire 116 Lowell Street P.O. Box 516 Manchestcr, NH 03105 Edward J. McDermott, Esquire Sanders and McDermott Professional Association 408 Lafayette Road Hampton, NH 03842 Jo Ann Shotwell, Esquire Assistant Attorney General Environmental Prote, a Bureau Department of the Attorney General One Ashburton Place, 19th Floor Boston, MA 02108
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