ML20150F064

Forwards Response to NRC 790308 Technical Questions Re Control Bldg Design Mods.Response Also Being Served on ASLB & All Parties to Control Bldg Proceeding

ML20150F064
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	03/28/1979
From:	Lindblad W PORTLAND GENERAL ELECTRIC CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
TAC-07551, TAC-11299, TAC-7551, WJL-GAZ-4GAH2A6, NUDOCS 7904030317
Download: ML20150F064 (8)

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March 28, 1979 Trojan Nuclear Plant Docket 50-344 License h7T-1 Director of Nuclear Reactor Regulation ATTN:

Mr. A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C.

20555

Dear Eir:

Attached are our responses, prepared by Bechtel Power Corporation, to the NRC Staff technical questions of G

March 8,1979, concerning the Trojan Control Building design modifications. We have forwarded 3 signed and 40 copies of this letter.

This letter and attachnent are being served on the Atomic Safety and Licensing Board (ASLB) and all parties to the Control Building proceeding.

Sincerely, X,

1 JWD 4,

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4.taa Vice President Engineering-Construction WJL/CAZ/4gah2A6 Attachment G

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5 RESPONSES TO NRC QUESTIONS DATED MARCH 8, 1979 9

1.

Describe the distance between the diesel fuel lines in the area to be excavated as described in Section 5.3.3 of PGE-1020.

The distance betvean the centerlines of the two diesel fuel lines in the area to be excavated is 1 f t 3 in.

2.

Describe the location of all shutof f and cross-connection valves in the fuel oil lines for the diesel generators.

The location of shutoff and cross-connection valves in the fuel oil lines for the diesel generators (shown on FSAR Figure 9.5-3) are as follows:

West Emergency Diesel Generator Room (Turbine Building)

Valve No Location D0005 9 ft vest of column line Y, D0007 12 in. off north wall D0011 at Elevation 47 f t 6 in.

MO-4903A D0017 4 ft east of column line Z, D0019 3 ft 6 in north of colu=n line 47 at Elevation 45 ft 6 in.

D0023 6 in. vest of column line X, 6 in. off north wall at Elevation 45 f t 6 in.

D0008 12 in. east of column line X, 6 in. off north wall at Elevation 49 ft.

D0025 5 f t 3 in. east of column line Z, D0027 9 f t 6 in. south of column line 47 at Elevation 47 f t 9 in.

D0029 10 ft east of column line X.

D0031 9 f t 6 in. south of column line 47 at Elevation 47 f t 9 in.

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t East' Emergency Diesel Generator Room (Turbine Building)

Valve No.

Location D0009 3 ft east of column line W',

6 in. off north wall at Elevation 49 f t.

D0010 3 f t east of column line W',

6 in. off north wall at Elevatlon 47 f t 6 in.

D0006 7 f t east of column line W',

6 in, off north wall at Elevation 47 f t.

N04903B 3 ft east of column line W',

3 ft off north wall at Elevation 47 f t 6 in.

D0018 7 ft east of column line W',

D0022 4 f t 6 in. of f north wall at Elevation 45 f t 5 in.

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D0024 1 f t 3 in east of column line W',

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D0026 9 ft 6 in. south of column line 47 i

at Elevation 47 f t 5 in.

D0030 4 f t east of column line T, D0028 9 f t 6 in. south of column line 47 at Elevation 47 f t 5 in.

i Vicinity of Stc, rage Tanks (Yard Area East of Fuel Building) i, l

Valve No.

Location D0001 D. O. Transfer punp A discharge l

D0003 109 ft east of column line A.

L 65 f t south r,f column line $5.

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D0002 D. O. Transfer pump B discharge D0004 125 f e east of column line A.

l 65 ft east of column line 55.

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s Diesel Auxiliary Feed Pump Room (Turbine Building) valve No.

I.ocation D0021 2 f t 5 in. south of column line 65, i

27 ft 9 in. east of column line S at Elevation 49 f t 5 in.

D0032 2 f t 5 in. south of column line 65, 24 ft 6 in. east of column line S at Elevation 49 f t 6 in.

D0033 4 ft 11 in. south of column line 65, 30 f t 5 in. east of column line S at Elevation 58 f t 4 in.

D0034 6 fe 6 in. south of column line 65, 26 ft east of column line S at Elevation 58 f t 4 in.

MO-4907A 3 ft 8 in. south of column line 65, 31 f t 5 in. east of column line S at Elevation 58 f t 4 in.

HO-4907B 5 ft south of column line 65, 26 i.e east of column line S e

at Elevation 58 f t 4 in.

3.

Identify and discuss the area and depth to be excavated by hand when uncovering diesel fuel lines.

The conventional backfill surrounding the diesel fuel lines will be removed by light hand tools, such as shovels, until sound rock is l

encountered.

If removal of any rock is required, light power tools vill be used.

4.

Describe measures to be taken to protect diesel f uel lines when hoisting steel plates and the fire protection measures to be taken in event of a line rupture by either hand tool damage or by drop-ping the steel plate.

The construction sequence is planned such that hoisting of the plates will not occur wSile the fuel lines are exposed. The excavation will be refilled and the concrete floor replaced before hoisting of the steel plate sections above this area is perforned. Thus, the fuel lines will be protected f rom any potential harm by approximately 5 ft of earth and the s a crete floor.

Hand-cperated chain hoists and the auxiliary hook of the overhead crane in the Turbine Building will be used to raise or lower plate sections into position.

pull redundancy will be provided for each lifting device needed (e.g., if two hoists are needed to lift a plate section, four hoists will be utill ed). _

1 The holsts and crane hook will have a safety factor of five times the required capacity.

In case of the failure of one hoist, the remaining hoisting device vill still have the capacity to carry the entire weight 0

of the plate sections and thus preclude their dropping.

The fire protection provided during the excavation around the diesel fuel oil lines and during other construction activities consists of administra-tive procedures, the permanent sprinkler system 'B' and hand-held fire extinguishers.

Should one of the lines be damaged, the amount of fuel oil vould be limited to that contained in the piping, thus, the combus-tion loading would be minimal. This section of piping is isolated f rom the fuel oil day tanks by normally closed, motor-operated valves and

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check valves. Oil f rom the underground storage tanks is supplied through l

these sections of piping only during operation of a diesel oil transfer i

pump which will be controlled during excavation.

1 During the excavation around the fuel oil lines, a fire watch will I

be added that will remain at his station for at least 30 min af ter com-pletion of work to ensure that the pipes are not leaking. During the entire modification program, including excavation, local hand-held fire extinguishers will be provided in this area.

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5.

Describe the effect of dropping the steel plate on the duct banks

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described in Sections 5.3.3 and 5.3.9.

khat protection is af forded against damage to safety-related cables?

As with the diesel fuel lines, the duct banks vill not be exposed during hoisting of the' plate sections since they are located below grade and vill be covered by backfill and.the concrete slab at grade.

6.

Describe measures to be taken to protect cables when hoisting plates above trays over to the guides as discussed in Section 5.3.11.

l l

The equipment that will be used to hoist the plates above trays sill l

be as described in the response to Question 4 The lower plates vill be secured in place first, thereby providing a lower limit stop to arrest downward motion of the upper plate section. Vertical steel guides af fixed to the lover plates will ensure that the upper sections will come to rest on the lower previously installed plate section.

Since the lower plate will arrest the downward motion of the upper plate, contact with the cable trays should not be possible.

7.

Describe measures to protect these cables f rom damage by the hoisting equipment.

The holsts will be installed above Elevation 93 ft.

The cables will be protected f rors the holsts by the floor sisb at Elevation 93 f t 0 in.

Guides will be installed to prevent any contact between the hoisting equipment and the cable trays.

t 8.

What equipment vill be used to raise / lower the plate (s) into position?

This equipment is described in the response to Question 4.

9.

As described in PGE-1012, "Trojan Nuclear Plant Fire Protection Review" (Page F-5), Plant safety procedure PS-7 requires that all immoveable combustible material below and within a 35-f e radius dere velding, cutting, grinding, or open flame work is performed be protected by asbestos curtains, metal guards or flame-proof covers.

In this regard, state the material composition of the protective blankets and velding screens discussed in Section 5.3.11 of PCE-1020.

The material is Claremont Weld Shield Style No. 800-24, manufactured by Claremont Company, Inc., 82 Camp Street, Meriden, Connecticut. or equivalent material. The material is described in Attachment 1.

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gn, 1,71 RESPONSES TO NRC STAFF i

TEQINICAL QUESTIONS DATED MARCH 8,1979 ATIAODDT 1

. PACE 1 of 2 Weld Fhield Fabrics Cla remont Weld Shictd fab'rics have been designed for difficult and demandin service conditions.

Under normal welding and acetylene cutting conditions Cla remont Weld Shield fabrics will give many times the use and wear itfe expticted of conventional welding cloth.

_ Con s t ruc tion Weld shield fabrics are made of special glass fabrics designed for high strength and flex resistance.

The incombustible cha racteristics of glass are then enhanced with a speelally enmpounded Neoprene coating.

The resulting fabric provides high abrasion resistance, tear snd puncture resistance, easy sewing and will shed molten metal splash in a good many applications.

Advanta ce s Most conventional fabrics used for welding or acetylene cutting protection can become quite flammable if contaminated with oils or grease, Weld Shield products do not readily absorb any liquid and surfaces can generally be wiped clean increasing the life and safety of the fabric.

in a fabrie make it clean to use-no lint or dust to contaminate immediate orTh adjacent a reas.

Feld shield fabrics a re lightweight and strong permitting easy sewing of curtains, pads and clothing.

Apnlications Prntection vf equipment, protection of personnel, flameproof curtains for eye protection (nf chippers, sanders and welders).

Weld Shield can be used to direct acetylene cutting drop to desired areas, all purpose protection during heavy construction where weldt:ig, cutting, abrasion and flame a re present.

Weld Shield fabrics can be used for Safety Clothing applications such as aprons, coats, shoulder patches, spats, pants, etc. based on the hazard and conditions, r

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June 1-71 RESPONSES TO NRC STA F TECHNICAL QUESTIONS DATED MARCH 8, 1979 AITACHMENT 1 B ASE FABRIC DATA AG 2

Style Number 24 32 Dose Fab ric Cla s s W cave Glass Plain Ccnst. WXT Plain 19 x 10 W cht, o:/ yd, ",

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8. 8 16.3 Std. Width 38"-50" 38" FINISHED FAB RIC PHYSICA LS Coating F. R. N eoprene F. R. Neopr ene Method FTMS 191 Cclo r Green #239 Green #239 Coating Deposit Balanced Finish B ala nc ed

.Te.nured T e.tu r ed Wght o:/yd.

22+2 3 2,+ 2 Thickne s s -Mils.

33-35 38-40 nsile: Warp 230 230 Fill 90 5102 280 Tea r:

Warp 15 5102 20 Fill 12 5970 20 5970 Finme Re sistance Flame out (s ec. )

.O to 2. O Max.

.O to 2. O M ax 5903 A f ter Clow (sec. )

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.O te2. O Max 5903 Char Length (in. )

1-2 1-2 5903 Roll SI::e s 50-100 yds.

50-100 yds.

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