ML20206G515

Summary of 990421 Meeting with Util Re Error Involving Recent ATWS Analyses Using GE Odyn Code.List of Attendees Encl

ML20206G515
Person / Time
Site:	Prairie Island
Issue date:	04/30/1999
From:	Tae K NRC (Affiliation Not Assigned)
To:	NRC (Affiliation Not Assigned)
References
TAC-MA3478, NUDOCS 9905100041
Download: ML20206G515 (27)

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April 30, 1999 VENDOR: General Electric Nuclear Energy

SUBJECT:

MEETING BETWEEN GENERAL ELECTRIC NUCLEAR ENERGY AND THE NRC STAFF CONCERNING USE OF ODYN CODE FOR ATWS ANALYSIS (TAC NO: MA3478)

The NRC staff met with representatives from the General Electric Nuclear Energy (GE) at NRC Headquarters on April 21,1999, conceming an error involving recent ATWS (anticipated transient without scram) analyses using GE's ODYN code. Enclosure 1 lists the meeting participants,' A public meeting notice for the subject meeting was issued on April 7,1999, and a copy of the meeting notice was posted on the NRC's public intemet webpage.

Prior to the meeting on March 11,1999, GE informed the staff via a telecon, that an input error to the ODYN code was identified while performing an ATWS analysis for a boiling-water-reactor plant in preparation for a power uprate application. The ODYN code was used for ATWS analysis in two recently approved power uprates: Monticello (September 1998) and Hatch (October 1998). The input error to the ODYN code involves a non-conservative assumption for the reactor vessel water level. GE indicated that a number of sensitivity studies were run and the preliminary results showed that the net effect of the error is negligible. GE also contacted both Monticello and Hatch with the information. GE requested to meet with the staff to discuss this issue in detail.

During the meeting on April 21,1999, GE presented various aspects of the issue including error discovery and communication, error description and consequences, and error resolution. l Enclosure 2 is a copy of the slides that were used during the meeting. GE concluded that the impact of the error is negligible due to the veracity of the benchmark process involved in ODYN application. GE also stated that: (1) GE is developing technical design procedures to improve process cer:trols and to reduce potential for similar error, (2) published Monticello and Hatch ATWS results are bounding, (3) the error does not invalidate the ODYN-ATWS qualification l

report that had been approved by the staff, and (4) GE will publish an accepted version of the  !

ODYN qualification report incorporating revised figures.

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2 The staff requested that GE submit a letter to the NRC documenting GE's conclusions and resolution of the error, and t. revised ODYN qualification report incorporating corrected figures.

In addition, the staff requested that GE, together with the affected licensees, (independent of the staff's review) determine whether or not the individual power uprate amendment requests or l other licensing basis documents for both Monticello and Hatch need to be amended. j

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l

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Tae Kim, Senior Project Manager, Section 1 '

Project Directorate ill Division of Licensing Project Management Office of Nuclear Reactor Regulation

Enclosures:

As stated cc w/encis: See next page

l I

2 April 30, 1999 The staff requested that GE submit a letter to the NRC documenting GE's conclusions and resolution of the error, and a revised ODYN qualification report incorporating corrected figures, in addition, the staff requested that GE, together with the affected licensees, (independent of the staff's review) determine whether or not the individual power uprate amendment requests or other licensing basis 6cuments for both Monticello and Hatch need to be amended. ,

Original signed by:

Tae Kim, Senior Project Manager, Section 1 Project Directorate til Division of Licensing Project Management Office of Nuclear Reactor Regulation

Enclosures:

As stated cc w/encts: See next page plSTRIBUTION:

HARD COPY Docket File (50-282,50-306) PUBLIC PD#3-1 Reading T. J. Kim OGC ACRS E-MAIL S. Collins /R. Zimmerman B. Sheron J. Zwolinski/S. Black C. Thomas /G. Dick G. Holahan/T. Collins J. Wermiel C.Lyon L. Olshan A. Ulses H. Scott D. Ebert A . Wtu DOCUMENT NAME: G:\PD3-1\WPDOCS\UPRATE\MTG4219.WPD

r. e een or m. eewn.,w, weem. m m. bu: c cm ww .n.*n nvenao r con we en.mn.nv.noo v No cm OFFICE PM:PD31 E LA:PD31 C SC: 1p(B E ' SC:PD% 1.,j Ji - C NAME TJKim4~e4 THarriso.) RC&lso GDick NA DATE 4 /2f/9D ~ 4 / AF /99 4/q i /99 4 /S / 99~

OFFICIAL RECORD COPY

~

,/ .

2 April 30, 1999 The staff requested that GE submit a letter to the NRC documenting GE's conclusions and resolution of the error, and a revised ODYN qualification report incorporating corrected figures.

In addition, the staff requested that GE, together with the affected licensees, (independent of the staff's review) determine whether or not the individual power uprate amendment requests or other licensing basis documents for both Monticello and Hatch need to be amended.

Original signed by:

i Tae Kim, Senior Project Manager, Section 1 Project Directorate Ill j Division of Licensing Project Management j Office of Nuclear Reactor Regulation j

Enclosures:

As stated cc w/encls: See next page l l

DISTRIBUTION: I l

HARD COPY Docket File (50-282, 50-306) PUBLIC PD#3-1 Reading T. J. Kim OGC ACRS E Mall S. Collins /R. Zimmerman B. Sheron J. Zwolinski/S. Black- C. Thomas /G. Dick j G. Holahan/T. Collins J. Wermiel C.Lyon L. Olshan A. Ulses H. Scott ,

D. Ebert A . LGw 1 DOCUMENT NAME: G:\PD3-1\WPDOCS\UPRATE\MTG4219.WPD To receive a copy of this document, Indicate in the boa: * {s Copy whhout attachment / enclosure *E' = Copy with attachment / enclosure "N* = No copy OFFICE PM:PD31 E LA:PD31 l C SC: 3[tXB E SC:PD}1 Ji- C NAME TJKimf,4ht THarriso.:) RCADso GDick j$

DATE 4 /2[(/9M ~ 4 /.1F /93 4/q 4 /99 4 /ji'(/ 799~

OFFTCIAL RECORD COFY

6 cc' Licensing Manager Licensing Manager Illinois Power Company Stone & Webster Engineering Clinton Power Station Corporation P. O. Box 678 Post Office Box 5200 Clinton,IL 61727 Cherry Hill, NJ 08034 Licensing Manager. Mr. Joseph Quirk Pennsylvania Power & Light Company GE Nuclear Energy 2 North Ninth Street A1-2 175 Curtner Avenue Allentown, PA 18101 -

San Jose, CA 95125 Licensing Manager Licensing Manager Detroit Edison Company Southem Nuclear Operating Company Fermi 2 - 280 TAC 40 Iverness Center Parkway

' 6400 North Dixie Highway Birmingham, AL 35242 Newport, MI 48166 Licensing Manager Licensing Manager Limerick Generating Station Tennessee Valley Authority Post Office Box 2300 (JKF 3-1)

Browns Ferry Nuclear Power Station Sanatoga, PA 19464 Post Office Box 2000 Decatur, AL 35609 Licensing Manager New York Power Authority Licensing Manager 123 Main Street Peach Bottom Nuclear Power Station White Plains, NY 10601 RD #1-Lay Road (A4-1N)

Delta, PA 17314 Licensing Manager Niagara Mohawk Power Company Licensing Manager 301 Plainfield Road (SM3)

Commonwealth Edison Compao Syracuse, NY 13221 1400 Opus Place Suite 500 Downers Grove,IL 60515 Licensing Manager Northern States Power Company Licensing Manager Monticello Nuclear Generating Plant PECO Energy 2807 West County Road 75 955 Chesterbrook Boulevard Monticello, MN 55362-9637 Wayne, PA 19087-5691 Licensing Manager Licensing Manager Carolina Power & Light Company Public Service Electric & Gas Brunswick Steam Electric Plant Company P. O. Box 10429 Nuclear Administration Building Southport, NC 28461 Foot of Buttonweed Road Hancocks Bridge, NJ 08038 Licensing Manager Washington Public Power Supply System 3000 George Washington Way Richland,WA 99352

-- _A

LIST OF MEETING ATTENDEES NAME AFFILIATION T. J. Kim NRC/NRR/DLPM/PD3-1, Senior Project Manager C.F.Lyon NRC/NRR/DLPM/PD3-1, Project Manager - Monticello L. Olshan NRC/NRR/DLPM/PD2-1, Senior Project Manager-Hatch R. Caruso NRC/NRR/DSSA/SRXB, Section Chief A. Ulses NRC/NRR/DSSA/SRXB, Technical Reviewer H. Scott NRC/RES, Research Engineer D. Ebert NRC/RES, Research Engineer I

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