ML19241A963
| ML19241A963 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 07/05/1979 |
| From: | Rachel Johnson PORTLAND GENERAL ELECTRIC CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| TAC-07551, TAC-11299, TAC-7551, NUDOCS 7907110474 | |
| Download: ML19241A963 (10) | |
Text
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C July 5, 1979 Troja". Nuclear Plant Docket 50-344 License STF-1 Director of Nuclear Reactor Regulation ATTN:
Mr. A. Scbwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors U.S. Nuclear Regult. tory Commission Washington, D. C. 20555
Dear Sir:
Enclosed are the responses prepared by Bechtel Power Corp.
to informal questions raised by staff members during their site visit on June 13-14, 1979. This visit and the questions responded to herein concern construction details related to the structural modifications of the Control-Fuel-Auxiliary Building Complex.
Sincerely, l
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... W. Johnson Corporate Attorney Portland General Electric Ccmpany RWJ/JCL/4kk6A24 Enclosure h
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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY aND LICENSING BOARD In the Matter of
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Docke t 50-344 PORTLAND GENERAL ELECTRIC COMPANY,
)
et al
)
(Control Building Pr(ceeding)
)
(Trojan Nuclear Plant)
)
CERTIFICATE OF SERVICE I hereby certify that on July 5, 1979, Licensee's letter to the Director of Nuclear Reactor Regulation dated July 5, 1979 and an attach =ent entitled " Request for Additional Information, Trojan Nuclear Plant, Proposed Control Building Design", have been served t oon the persons listed below by depositing copies thereof in the Unite? States mail with proper postage af fixed for first class mail.
Marshall E. Miller, Esq., Chairman Joseph R. Gray, Esq.
Atomic Safety and Licensing Board Counsel for NRC Staff U. S. Nuclear Regulatory Commission U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Washington, D. C.
20555 Dr. Kenneth A. McCollom, Dean Lowenstein, Newman, Reis, Axelrad &
Division of Engineering, Toll Architecture and Technology 1025 Connecticut Avenue, N. W.
Oklahoma State University Suite 1214 Stillwater, Oklahoma 74074 Washington, D. C.
20036 Dr. Hugh C. Paxton Richard M. Sandvik, Esq.
1229 - 41st Street Assistant Attorney General Los Alamos, New Mexico 87544 State of Oregon Department of Justice Atomic Safety and Licensing Board 500 Pacific Building Panel 520 S. W. Yamhill U. S. Nuclear Regulatory Commission Portland, Oregon 97204 Washington, D. C.
20555 William Kinsey, Esq.
Atomic Safety and licensing Appeal Bonneville Power Administration Panel P. O. Box 3621 U. S. Nuclear Regulatory Commission Portland, Oregon 97208 Washington, D. C.
20555 a7s
) ' [I Docketing and Service Section T
i i Office of the Secretary
((h>f" U. S. Nuclear Regulatory Commission Washington, D. C.
20555
CERTIFICATE OF SERVICE Ms. Nina Bell Mr. Eugene Rosolie 728 S. E. 26th Avenue Coalition for Safe Power Portland, Oregon 97214 215 S. E.
9th Avenue Portland, Oregon 97214 Mr. John A. Kullberg Route 1, Box 250Q Columbia County Courthouse Sauvie Islar.d, Oregon 97231 Law Library Circuit Court Room Mr. David B. McLoy St. Helens, Oregon 97051 348 Hussey Lane Grants Pass, Oregon 97526 Ms. C. Ca ll i'a rs o n P. O. Box 2992 Kodiak, Alaska 99615 1 '
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Ronald W.jJahnson Co rpo ra tt/At to rney Portland GeneraI Electric Company Dated: July 5, 1979
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4sb66.27B8
Responses to NRC Questions Raised During the June 13-14 Visit to Trojan Nuclear Plant Ouestion 1 Describe in detail the construction of the new R-line wall.
Response 1 The general sequence and details of construction for the R-Line wall are described in Section 4 of : CE 1020. New construction of the R-line wall will axtend from Coltmn L ine 41 to approximately 14 ft south of Column Line 46 and from El. 45 ft to 97 ft. 3 inches.
Tenporary removal of the staimay to the *. ewing gallery, the access platfom for the overhead crine, the dry standpipe, and other interfering facilities above El. 93 ft in the Turbine Building will provide the necessary access for chain-hoist rigging as described below. Platfoms and stairs will be removed by hand-rigging and use of the Turbine Building crane.
Fom work and reinforcing steel installat'on far the new R-line wall between Column Lines 41 and 46 will be of conventional construction with forms on both surfaces up to El. 59 ft 3 in.
A steel ledger angle will be embedded in the concrete wall at El. 59 f 3 in. to aid in setting steel Plate No. 1.
At this elevation, conventional fom work and reinforcing steel will continue to be used to form the east face of the R-line wall to the underside of the floor at El. 65 ft.
When ho'es are being drilled through the existing R-line wall, personnel will be stationed on the side of the wall opposite the drill to observe penetratien of that side of th^ wall. Communications will be maintained between these personnel and the drillers. Depth limiting devices will be used with the drills to control the length of the penetration.
The use of pilot holes, rebar finders and impact drills v :11 reduce the p' nibility of cutting reinforcing steel in the existing block walls and the concrete core.
However, reinforcing steel may be encountered during drilling which would require moving some holes and grouting the partially drilled hole. Such grouting will be perfomed prior to drilling the replacement hole. A template, which will be made after all holes in the wall for a given plate have been erilled, will serve as the drilling pattern for the associated plate.
Steel plates for the west face of the wall from El 59 f t 3 in to 97 ft 3 in.
wil' be delivered and unloaded at ground level, El. 45 ft.
Steel plates to be installed consist of 8 sections and will be numbered 1 through 8 for identificatiuon (see drawing RSK-1).
neel Plates No. I through 6 will be hoisted and installed below all the cable tray. Steel Plates No. 7 and 8 will be hoisted through the opening below the Turbine Building crane and lowered over the cable trays from above the El. 93 ft floor.
When hoisting each steel Plate No. I through 6, slings ' rom two of the chain hoists will be used to lift the load and come-alongs, cable pullers, or c
5o
Page Two similar tools will be used to drift the plates clear of the fire lines belcw El. 69 f t. When hoisting Plates No. I through 6, the third chain hoist will be attached to the plate at a point noninally above the center of gravity.
This chain hoist will not be loaded but will remain taut to receive the load should either of the two outboard chain hoists nalfunction. Drawing RSK-1 shows details of the hoisting operations.
Steel Plate No. I will be hoisted from ground level and set in place at El. 59 ft 3 in. and extend upward to El. 64 f t.
Af ter the plate has been set and aligned, the following activities will be performed:
1.
The through bolts will be installed, with a bond-breaker applied.
The nuts will be tightened to hold the liquid concrete head, but the bolts will not tensioned.
2.
Cencreta will be placed behind steel Plate No.1, which is used as a form.
Steel Plate No. 2 will then be hoisted from El. 45 f t, past Plate No.1, and set in place from Ei. 64 ft to 70 ft.
After Plate No. 2 has been set and aligned, the following activities will be performed:
1.
Through bolts will be installed in the same manner as for Plate No. 1.
2.
Steel Plates No.1 and 2 will be welded together.
3.
Concrete will be placed the same as for Plate No.1.
Steel Plate No. 3 will then be installed using the throu]h bolts, welding nad placing ConCrtte in the same manner as Plate No. 2 fron El. 70 ft to El 74 ft 3 in.
Steel Plate No. 4 will then be installed in the same manner as Plate No. 3 from El. 74 ft 3 in. to 79 't 3 in. except that grout, rather then concrete, wil' be piaced between the plate and the existing wall. Spacers will be used to maintain a nominal 1 in. clearance between Plate No. 4 and the existing R-line wall.
Plate No. 7 will be raised to the El. 93-ft floor by the Turbine Building crane.
This plate will be drifted east to the R-Line wall, then ba picked up by three chain hoists, and lowered into place.
Following installation of Plate No. 7, Plates No. 5 and 6 will be installed on either side of Plate No. 7 and welded to it from El. 79 ft 3 in. to El. 85 ft 3 in.
During installation of Plates No. 5, 6, and 7, spacers and grout dans will be placed at the north and south ends of the plates arour.d cable tray openings.
Greut wi'l be placed behind these plates following weldir;.
Steel Plate No. 8 consists of two pieces that will either be asserbled at ground level, El. 45 f t, in a vertical support frame or assembled tffsite.
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Page Three The plate will weigh approximately 23 tons and will be lif ted frce El. 45 f t with the Turbine Building crane to cn elevation adequate to clear the El. 93-ft floor.
From this point, the plate will be moved east with the Turbine Building crane and the south end of the plate placed as far behind the diesel exhaust pipes as possible, as limited by the travel of the auxiliary hoist on the Turbine Building crane.
Plate No. 8 will then br
.;t on a Hillman roller runway and prior to release of the crane hoist, chain hoist No. 5 will be attached to the south end. Once the plate is supported by Chain Hoist No. 5 and the Hillman roller runway, it can be moved into position parallel to the R-line wall.
Hoists 1, 2, and 4 will then be attached and Plate No. 8 will be lifted clear of the support frame and lowered into position using the four 16-ton chain hoists. This in itself will provide 2-to-1 redundar. y.
In addition, each chain hoist has a 5-to-1 safety factor as does the cesign of the complete hoisting assembly.
The two outboard chain hoists will handle the load with the two inboard hoists following the load in a taut condition. As long as the inboard following hoists do not assume an inordinate portion of the load, the outboard hoists will share the load in accordance with their relation to the plate's center of gravity.
This relationship is shown on Drawing RSK-1.
The inboard hoists will be monitored to take only enough load to be kept taut by the use of load cells in the rigging.
Prior to hoisting, both the hoist of the Turbine Building crane and the chain hoists will be tested onsite or at another appropriate facility.
Chain hoists will be Yale NH Hand Hoist or equal.
Question 2 Describe the methods which will be used to control dust during the modi fication work.
_Resconse 2 As necessary, water spray will be used to limit the spraad of dust. Vaneaxial or other type fans with flexible discharge ducts may also be used to direct dust away from the area as necessary. However, it is not expected tha* the amount of dust generated will cause problems with equipment in the vicinity of modification work. Any debris or dust on the penetration side of the wall can be contained by a light enclosure over the genetration.
Question 3 What will be the extent of vibration and noise associated with drilling of the wall?
Resoonse 3 Vibrations and noise transmitted through the structure from the drilling operation on the R-line wall adjacent to the control room are expected to be detectable in the control room and may present a temporary nuisance, un8 m
ould adversely Page 4 vibrations will be insignificant relative to levels that c itted noise should be well below tions within the control af fect control room equipment, and transm i
levels which could disrupt nomal voice comun caHowever, a i g considered to verify the effects of the vibration anasscciated with drilling ope t to the control room.
room.
ide access and egress along Question 4 k in case of a plart emergency?
'nhat provisions hue been considered to provColumn Line to or egress from areas in Pestonse 4 f med, all work will be teminaud and Fcr any condition requiring immediate access The worst case of possible inter-which modification work is ceing per o f Plates 1 through 4 into a materials will be moved out of the way.ference with access w It is possible trat access will be f 15 min while each plate is being position parallel with Column Line R.
Adequate alternate access restricted for a period on the order o and Cont.oi tsuildings, and l
Line R.
rolled into a position parallel to Co umnis available through i
temporary obstruction of access in the areess requirements.
present any difficulty with access or egr ding room be protected from accidental Question 5 How will cable trays in the cable sprea cropping of the large plate washers?
Response 5 in the vicinity of the work Cable tray covers will Le placed on traysThe tray covers to be used, as nd coastruction and in common associated with hoisting plate washers.necessary, are thos use.
Question 6 t damage to Class I utilities beneath What precautions will be taken to prevenilding in the event of an ac the El. 45-f t slab in the Turbine Buof a section of the ste dling?
Response 5 s of safety in the hoisting The redundant hoists, along with large f actorl drop of a section of ste assemblies, will preclude the accidenta
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Page Five Ouestion 7 barrier be maintained between the Control Builaing and the b
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Response 7 Durirg drilling operations, a fire watch will be stationed at the work location. Af ter the holes are drilled and prior to the installation of the plates, the holes will be sealed with approved fire protection material.
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