ML20237A410

Forwards RAI Re Plant Request for Amend to Support Repowering Site W/Natural Gas Fired,Combined Cycle Turbines. Response Requested to Be Provided within 60 Days of Date of Ltr

ML20237A410
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	08/11/1998
From:	Thonus L NRC (Affiliation Not Assigned)
To:	Quennoz S PORTLAND GENERAL ELECTRIC CO.
References
TAC-M91021, NUDOCS 9808140036
Download: ML20237A410 (5)

Text

e August 11, 1998 Mr. Stephen M. Quennoz Portland General Electric Company Trojan Nuclear Plant 71760 Co!umbia River Highway Ranier, Oregon 97048

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION -INSTALLATION OF A NATURAL GAS TURBINE COMBINED CYCLE POWER PLANT AT TROJAN SITE (TAC NO. M91021)

Dear Mr. Quennoz:

This refers to your License Change Application No. 238 related to a proposed modification of the Trojan Plant to support repowering using a natural gas fired turbine. We have i determined that we need additionalinformation or clarification to complete our review of the safety analysis report attached to your June 6,1996 submittal. Please provide responses to the enclosed Request for AdditionalInformation within 60 days of the date of this letter. This is the first request for additionalinformation pertaining to your submittal.

In accordance with 10 CFR 50.30(b), your response to the enclosed Request for Additional  !

Information must be executed in a signed original under oath or affirmation.

This requirement affects nine or fewer respondents and, therefore is not subject to Office of Management and Budget review under P.L.96-511.

Sincerely, ORIGINAL SIGNED BY: Richard Dudley for  ;

Lee H. Thonus, Project Manager Non-Power Reactors and Decommissioning Project Directorate Division of Reactor Program Management Office of Nuclear Reactor Regulation Docket No. 50-344

Enclosure:

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% # August 11, 1998 i

l Mr. Stephen M. Quennoz .

Portland General Electric Company Trojan Nuclear Plant 71760 Columbia River Highway Ranier, Oregon 97048

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - INSTALL.ATION OF A NATURAL GAS TURBINE COMBINED CYCLE POWER PLANT AT TROJAN SITE (TAC NO. M91021)

Dear Mr. Quennoz:

This refers to your Ucense Change Applicat i on No. 238 related to a proposed modification of the Trojan Plant to support repowering using a natural gas fired turbine. We have determined that we need additionalinformation or clarification to complete our review of the safety analysis report attached to your June 6,1996 submittal. Please provide responses to the enclosed Request for Additional Information within 60 days of the date of this letter. This is the first request for additionalinformation pertaining to your submittal.

in accordance with 10 CFR 50.30(b), your response to the enclosed Request for Additional Information must be executed in a signed original under oath or affirmation.

This requirement affects nine or fewer respondents and, therefore is not subject to Office of Management and Budget review ender P.L.96-511.

Sincerely.

Off

. k p-Lee H. Thonus, Project Mana er Non-Power Reactors and Decommissioning Project Directorate l Division of Reactor Program Management l Office of Nuclear Reactor Regulation Docket No. 50-344 I

Enclosure:

As stated cc w/ enclosure:

See next page t

-a l

l6 Mr. Stephen M. Quennoz Trojan Nuclear Plant Portland General Electric Company Docket No. 50-344 cc:

Chairman of the Board of County Commissioners l Columbia County St. Helens, Oregon 97501 Mr. David Stewart-Smith Oregon Department of Energy 625 Marion Street, N.E. I Salem, Oregon 97310 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower and Pavilion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 l Mr. H. Ray Pate l Manager Ucensing, Compliance and Commitment Management l Portland General Electric Company Trojan Nuclear Plant 71760 Columbia River Highway Rair,ler, Oregon 97048 Mr. Uoyd K. Marbet 19142 S.E. Bakers Ferry Road Boring, Oregon 97009 Mr. Jerry Wilson Do It Yourself Committee 570 N.E. 53rd Hillsboro, Oregon 97124 Mr. Eugene Rosolie l Northwest Environmental Advocates 302 Hasaltine Building 133 S.W. 2nd Avenue Portland, Oregon 97204 i

I a_______-________-_-______ _ _

e b

ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION TROJAN REQUEST FOR AMENDMENT TO SUPPORT REPOWERING SITE WITH NATURAL GAS FIRED. COMBINED CYCLE TURBINES

1. Resin Stornae in the Auxiliary Bulletag (a) Based on Section 4.1 of the safety evaluation, PGE rules out turbine missiles as a l

possibility of puncturing the vessel based on unfavorable trajectory patterns and the combined thickness of the roof and floor slabs in the Fuel / Auxiliary buildings.

For the postulated confined explosion in the Auxiliary building, an airborne object from within the auxiliary building could result from the explosion and could penetrate and rupture the vessel. Provide an evaluation of hazards which may result in a rupture of the vessel and release of the contaminated resin upon impact from a missile within the auxiliary building.

(b) Describe all confinement measures to control potentially contaminated run-off from automatic or manual suppression in the Fuel / Auxiliary building. ,

2. Fire Protection Svstems in the Auxiliarv. Turbine. and Fuel Buildinas )

(a) Describe the fire protection systems capable of detection or suppression of fires in the Auxiliary, Turbine, and Fuel buildings, that will be maintained during the natural gas operation. Verify that the systems are designed, installed, and maintained in accordance with the applicable National Fire Protection Association (NFPA) codes and standards. Specify the location of these features.

3. Low Level Radwaste Storace Area (a) Describe the fire protection provided to detect and suppress fires in the low level l radwaste storage area. Verify that the systems are designed, installed, and maintained in accordance with the applicable NFPA codes and standards.

4. Maximum Pressure Differential Across the Reactor Cavity Walls (a) The site dose cc,nsequences analysis in Section 4.5.6 of the safety evaluation, l assume;; that there are no radiological consequences from a confined explosion on l the Reactor Cavity and Containment. Through an earlier analysis in Section 4.5.2, I a calculated maximum differential pressure across the reactor cavity walls of 103 psi is considered a reasonable margin from the 150 psi design differential pressure by PGE.

Provide the calculations that were the basis for concluding that the maximum differential pressure across the Reactor walls is 103 psi.

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5. Accidental Release of Radioactive Matenals (a) Provide the a detailed description of the ' bounding" accident analysis discussed in sub-section 4.5.6. Include in the description the total source term assumed (activity and  ;

isotopic spectrum), the release fraction taken from DOE-HDBK-3010-94, atmospheric i dispersion factors assumed, and the resulting offsite dose calculated.

. (b) Discuss why an explosion in the Containment / Fuel / Aux. Buildings is considered more bounding than a fire in contaminated lon-exchange resins resulting from a gas explosion i and fueled by a continued un-isolated gas fire. If a resin fire is bounding, provide an analysis of the potential consequences with full discussion of all assumptions.  ;

6. Environmentallmoact l

Sub-section 2.1.5 of Attachment IV states that *NO publi:: or occupational exposure will l occur as a result of NGTCC [ Natural Gas Turbine Combined Cycle) plant operations."  !

Justify this statement in light of the residual contamination and radioactive materials on-  ;

site.- Identify any potential radioactive effluent pathways from NGTCC operation, include any previously uncontaminated systems that may become contaminated as a result of plant reconfiguration. Calculate annual dose to the maximum exposed member of the public from these releases. Provide an estimate of the annual dose to workers operating the NGTCC plant.

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