ML19341D543

Forwards Bechtel Safety Evaluation Re Acceptability of Severing Tendons in Precast Panels of Control Bldg Floor Slab During Mods.Certificate of Svc Encl.Related Correspondence

ML19341D543
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	02/25/1981
From:	Broehl D PORTLAND GENERAL ELECTRIC CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
TAC-43449, NUDOCS 8103050790
Download: ML19341D543 (5)

Text

,

I.'w.c n,,xr-mmum um ammmu Portland General ElectricCompany I

~

DonacJ BroeN Assistant Vce Prescem February 25, 1981 Trojan Nuclear Plant Docket 50-344 Lictmse NPF-1 l.

y p~ -

Mr. R. H. Engelken, Director f%'

OCC U. S. Nuclear Regulatory Commission

,, gcg y -

s i'.3 h ].J.. e Region V m

Suite 202, Walnut Creek Plaza l,Q

,,aoW c

'^

1990 N. California Blvd.

~;"

Walnut Creek, CA 94596 A

y/

Y/

Dear Mr. Engelken:

N' O/

In accordance with my letter to you dated February 6, 1981, attached is Licensee's Safety Evaluation, performed by Bechtel Power Corporation, of the acceptability of severing tendons in the precast panels of a Control Building floor slab during the Control Building modifications. A copy of this Safety Evaluation is being sent to the Office of Nuclear Reactor Regulation.

Sincerely,

,4~

. }

D t)

/(_,b,abl Xn A

JG D,'Cg' MAR 041993,, %

E v.s.

8 neouurcat /

'88 0 *

/

Attachment i'

c:

Mr. Robert A. Clark, Chief s

Operating Reactors Branch No. 3 Division of Licensing U. S. Nuclear Regulatory Commission Mr. Lynn Frank, Director

]

l State of Oregon Department of Energy Director of Inspection and Enforcement U. S. Nuclear Regulatory Commission f

Washington, DC 20555 Service List b.;.

33._73..g.g.,,,..

.3j

s UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING APPEAL BOARD In the Matter of

)

)

Docket 50-344 PORTLAND GENERAL ELECTRIC COMPANY,

)

et al

)

(Control Building Proceeding)

)

(Trojan Nuclear Plant)

)

CERTIFICATE OF SERVICE I hereby certify that on February 25, 1981 Licensee's letter dated February 25, 1981 to the NRC, Region V, with attachments, has been served upon t.ie persons listed below by depositing copies thereof in the United States mail with proper postage affixed for first class mail.

Alan S. Rosenthal, Esq., Chairman Dr. Kenneth A. McCollom, Dean Atomic Safety and Licensing Appeal Division of Engineering, Bosrd Architecture and Technology U. S. Nuclear Regulatory Commission Oklahoma State University Washington, D. C.

20555 Stillwater, Oklahoma 74074 Dr. John H. Buck, Member Dr. Hugh C. Paxton Atomic Safety and Licensing Appeal 1229 l'.at Street Board Los Alamos, New Mexico 87544 U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Atomic Safety and Licensing Board Panel Dr. W. Reed Johnson, Member U. S. Nuclear Regulatory Commission Atomic Safety and Licensing Appeal Washington, D. C.

20555 Board U. S. Nuclear Regulatory Commission Atomic Safety and Licensing Appeal Washington, D. C.

20555 Panel (5)

U. S. Nuclear Regulatory Commission Marshall E. Miller, Esq., Chairman Washington, D. C.

20555 Atomic Safety and Licensing ?oard U. S. Nuclear Regulatory Commission Washington, D. C.

20555

CERTIFICATE OF SERVICE Docketing and Service Section (4)

Ms. Nina Bell Office of the Secretary 3926 N. E. 12th Avenue U. S. Nucleat Regulatory Commission Portland, Oregon 97212 Washington, P. C.

20555 Mr. John A. Kullberg Joseph R. Graf, Esq.

15523 S. E. River Forest Drive Counsel for NRC Staff Portland, Oregon 97222 U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Mr. David B. McCoy 348 Hussey Lane Lowenstein, N<swasn, Reis, Axelrad &

Grants Pass, Oregon 97526 Toll 1025 Connecticut Ave., N. W.

Ms. C. Gail Parson Suite 1214 P. O. box 2992 Washington, D. C.

20036 Kodiak, Alaska 99615 Frank W. Ostrander, Jr., Esq.

Mr. Eugene Rosolie Assistant Attorney General Coalition for Safe Power State of Oregon 215 S. E. 9th Avenue Department of Justice Portland, Oregon 97214 500 Pacific Building 520 S. W. Yamhill Columbia County Courthouse Portland, Oregon 97204 Law Library Circuit Court Room William Kinsey, Esq.

St. Helens, Oregon 97051 Bonneville Power Administration P. O. Box 3621 Portland, Oregon 97208 MLS h.

w/

RonaldW.phnson Assistant General Counsel Portland General Electric Company Dated: February 25, 1981 4-66.27313

I COI:':ITl rCT CLI.RITICT. TION RCGLCDING

.i CUTTIIG TCNDOCS Ili PRECTET PAUCLS i

i

}

Background

}

In " Licensee's Tectimony on Matters Other than Etructural t

Adequccy of the Modified Complex", Licenace tectified that i

drilling aleng column line N' in the electrical at Willaries l

. room, so that rebar U-bends could be inserted would not i

affect the tendons in the precast pancis of the floor slab because the tendons are located at regular intervals and their location would be established and avoided during the drilling.

This testimony was based on Licensee's plan at that time to drill holes one inch in diameter.

Bechtel field construction engineering personnel requested that additional holes five inches in diameter be drilled to facilitate concrete placement.

This size hole necessarily required that two tendons in one panel be severed during the drilling process.

l Commitment Clari_fication The commitment is changed to allow no more than two tendons to be cut in the precast panel along column line M'.

Evaluation The design live load for the particular area is 300 psf.

An evaluation has shown that even with two tendons cut, the panel still has excess capacity when the actual live load resulting from the concrete placement is applied.

Once the new wall on N' line is constructed under the panel, it again will be able to carry the live load of 300 psf.

This change in commitment does nott (1) increase the occurrence probability or an accident of malfunction of safety-related equipment previously analyzed; (2) increase the consequences of an accident or malfunction of safety-related equipment previously analysed; (3) represent the possibility of a different type of accident or malfunction of safety-related equipment from the previously analyseds l

30/A-10 t

a l

l u-I Page 2 of 2 3

(4) reduce the scrgin of safety, nor (S) require a change to the Technical Seccificctionc or Opercting Licence, i

ALLO '

W$

P. Chang 6o

~

T. E. buchnell Bechtel Project Engineer civil Engineering Branch Menager Nuclear Projects Enginocring g

Agd ! p( y

/s/ C. P. Yundt T

J.W(Lentsch,Hanager C. P. Yundt Gcneration Licensing

'oneral Hunager and Analysis Department Trojan Nuclear Plant e

e O

6 30/A-13

~- -- - - -

.