NG-95-3121, Forwards Licensing TR Demonstrating Applicability of Option I-D as Appropriate Long Term Stability Solution for DAEC, Request for TS Changes & Proprietary Technical Description of Odysy.Proprietary Technical Description Withheld

Forwards Licensing TR Demonstrating Applicability of Option I-D as Appropriate Long Term Stability Solution for DAEC, Request for TS Changes & Proprietary Technical Description of Odysy.Proprietary Technical Description Withheld

ML20095A887
Person / Time
Site:	Duane Arnold
Issue date:	11/30/1995
From:	Franz J IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	Russell W NRC (Affiliation Not Assigned), NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19317C170	List: ML20095A889 ML20095A895 ML20095A901 NG-95-3121, Forwards Licensing TR Demonstrating Applicability of Option I-D as Appropriate Long Term Stability Solution for DAEC, Request for TS Changes & Proprietary Technical Description of Odysy.Proprietary Technical Description Withheld
References
GL-94-02, GL-94-2, NG-95-3121, NUDOCS 9512080060
Download: ML20095A887 (3)

Text

IES Utihties Inc.  ;

\

• 200 First Street S.E. .

sg RO. Box 351 Cedar Rapids, IA $2406-0351 relephone 319 398 B162 Fax 319 398 8192 UTILITIES , , , , , , ,_

Vice President, Nuclear November 30,1995 NG-95-3121 Mr. William T. Russell, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Attn: Docmnent Control Desk Mail Station PI-37 Washington, DC 20555-0001

Subject:

Duane Amold Energy Center Docket No: 50-331 Op. License No: DPR-49 Request for Technical Specification Change (RTS-287): " Implementation of Option I-D Reactor Stability Solution"

References:

Frar z (IE) to Russell (NRC), NG-94-3152, "IES Utilities' Response to NRC Generic Letter 94-02, 'Long-Term Solutions and Upgrade ofInterim Operating Recommendations for Thermal-hydraulic Instabilities in Boiling Water Reactors'," dated September 9,1994.

File: A-ll7

Dear Mr. Russell:

By letter dated September 9,1994 (Reference) IES Utilities Inc. committed to submit the following by December 31,1995 to support the Duane Arnold Energy Center's (DAEC's) long-term thermal-hydraulic instability solution: 1) a plant-specific Licensing Topical Report (LTR) in support of the BWR Owner's Group's " Regional Exclusion with Flow-Biased APRM Neutron Flux Scram" (Option I-D) as the long-term solution for the DAEC, 2) proposed Technical Specification changes necessary to implement Option 1-D and 3) a technical description of the stability predictor, a software program for assessing the margin from unstable core oscillations, including any related administrative controls.

Enclosed are the DAEC's plant-specific LTR which demonst ates the applicability of Option I-D as an appropriate long term stability solution for the DAEC (attachment 1), a request for Technical Specification changes (below) necessm/ to implement Option I-D, and a technical description of ODYSY (attachment 3), the analytical model used in the SOLOMON on-line stability predictor software. The D AEC has committed to install and g I

make the stability predictor operational within 90 dayr following the end of the 1996 I refueling outage. The technical description, ODYSY Descriotion and Oualification, GE

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NE-523-A038-0495, is a General Electric Company proprietary report which contains f

, 9512080060 951130 g g" g p/M / 8

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V November 30,1995 NG-95-3121 Page 2 of 3 information which the ' General Electric Company customarily maintains in confidence and withholds from public disclosure. As such, it has been handled and classified as-proprietary to General Electric. The confidential information has been identified in the report by vertical bars within the margins. As indivated in the attached affidavit .

(attachment 2), we bereby request that GE NE-523-A038-0495, be withheld from public disclosure in accordance with the provisions of 10 CFR 2.790(a)(4).

It is our current intent to operate SOLOMON continuously when the reactor is at power and to administratively restrict plant operation in certain areas of the power / flow map when SOLOMON is off-line.

In addition to implementing the Option I-D stability solution, the proposed revision to the Technical Specifications makes changes to specifically require that the reactor be scrammed in the event the reactor operates in natural circulation, a newly defined condition, and to prohibit restarting a recirculation pump while in natural circulation.

Also, the proposed change will remove core plate differential pressure noise surveillance requirements for single recirculation pump operation which are not related to thermal hydraulic instability or reactor safety.

This letter and application for revision to the Technical Specifications for the DAEC have been reviewed by the DAEC Oper&ns Committee and the DAEC Safety Committee. A copy of this submittal, including the analysis of no significant hazards consideration for the requested Tecimical Specification revision, is being forwarded to our appointed state oflicial pursuant to the requirements of 10 CFR 50.91.

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's -- November 30,1995 NG-95-3121  !

, Page 3 of 3 This letter is true and accurate to the best of my knowledge and belief.

By AA fohn p. Frafiz I  :

i Vice President, Nuclear State ofIowa (County) of Linn Signed and sworn to fore me on this k day of km RAb JA .1995,

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Notary Public ipd for the State ofIowA ll-188 Commission Expires Attachments: 1) Licensing Topical Report: Aeolication of the " Regional Exclusion With Flow-Biased APRM Neutron Flux Scram" Stability Solution (Option I-D) to the Duane Arnold Energy Center, GENE-A00-04021-01

2) General Electric Affidavit of Proprietary Information

3) Technical Description of Stability Predictor: ODYSY Descriotion and Oualification, GE-NE-523-A038-0495

4) Evaluation of Change with Respect to 10 CFR 50.92

5) Proposed Change (RTS-287) to the Duane Arnold Energy Center Technical Specifications

6) Safety Assessment

7) Environmental Consideration 4

JFF/LLS N:\lowa\ Licensing \RTs\stabiliity\cvritr. doc cc: L. Sueper L. Liu w/ Attachments 4-7 B. Fisher w/ Attachments 4-7 G. Kelly (NRC-NRR)

II. Miller (Region III)

S. Brown (State ofIowa)

NRC Resident Office Docu J