ML20211F807

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Summary of 970911 Meeting W/Northern States Power Co in Rockville,Md Re Equipment Environ Qualification Program. List of Attendees Encl
ML20211F807
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 09/22/1997
From: Kim T
NRC (Affiliation Not Assigned)
To:
NRC (Affiliation Not Assigned)
References
NUDOCS 9710010222
Download: ML20211F807 (4)


Text

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NUCLEAR REGULATORY COMMISSION ggy WASHINGTON. D.C. 30seHoot

\.g +/ September 22, 1997 -

MEETING PARTICIPANT: NORTHERN STATES POWER COMPANY

SUBJECT:

SUMMARY

OF SEPTEMBER 11. 1997. HEETING WITH NORTHERN STATES POWER COMPANY REGARDING EQUIPMENT ENVIRONMENTAL QUALIFICATION PROGRAM On September 11, 1997, representatives of Northern States Power Company (NSP) met with representatives of the Nuclear Regulatory Commission (NRC) at the NRC's offices in Rockville. Maryland. The enclosure provides a list of meeting attendees.

The meeting was requested by NSP representatives to discuss the methodology used in updating equipment environmental qualification (E0) for the proposed power uprate program. NSP representatives described to the staff the method used to establish their E0 composite accident temperature profile and the extent to which the Arrehenius methodology was utilized to establish qualification. The NSP indicated that equipment test profiles envelop the E0 composite accident profile for about the first 15 days (i.e. the duration of testing for a specific piece of equipment) following a design-basis accident-LOCA [ loss-of-coolant-accident]. To justify qualification of equipment beyond 15 days. NSP indicated that the Arrehenius methodology has been used to extend the equipment test profiles over relatively brief time intervals. The intervals were chosen to minimize the magnitude of temperature variation during the time period of interest to limit the potential for errors based on changes in activation energy. '

The staff expressed some concerns with the use of Arrehenius methodology in E0. The staff stated that the acceptance of the application of Arrehenius methodology is based on Regulatory Guide 1.89. Revision 1. " Environmental Qualification of Certain Electric Equipment Important to Safety for Nuclear Power Plants." issued in June 1984, that essentially limits its use to evaluating aging effects during the largely steady-state temperatures that can be assumed prior to a postulated accident. The staff stated that a concern exists with using it during the accioent sequence when temperatures can change over relatively short periods.

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The staff also indicated that activation energy may be temperature dependent  !

since reactions and aging mechanisms at high temperature and normal service temperatures may be different (i.e., activation energy may be a function of f)f2)/

temperature, rather than constant) which could introduce the potential for an additional error. The staff indicated therefore, that a reasonable time delay should be taken following the postulated accident before starting to use this method. The staff stated that the use of Arrehenius methodology should be acceptable as long as conservatism can be demonstrated. The staff stated that it recognizes that this is a generic concern independent of power uprate, and that additional guidance to the industry may be appropriate.

971001022

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2-Notwithstanding this generic concern, the staff determined that the licensee's approach appeared acceptable since it is consistent with the current licensing basis and is based on the licensee's description of its implementation of the methodology that includes updating all the existing E0 files to demonstrate qualification of each equipment for the proposed power uprate. However, the staff indicated that it may audit the updated EQ files in the future to verify that the licensee has adequately ensured qualification of each equipment for the proposed power uprate.

ORIGINAL SIGNED BY Tae Kim, Senior Project Manager Project Directorate III-1 Division of Reactor Projects - III/IV Office of Nuclear Reactor Regulation

Enclosure:

List of Attendees DISTRIBUTION:

Docket File PUBLIC PD# 3-1 Reading OGC ACRS TKim E-MAIL S. Collins F. Miraglia R. Zimmerman E. Adensam C. Jamerson G. Tracy. EDO B. Sheron G. Lianas J. Calvo D. Thatcher P. Shemanski J. Knox D. Nguyen P. Mitra F. Ashe J. McCormick RIII R. Gardner. RIII DOCUMENT NAME: G:\WPDOCS\MONTICEL\MTGSUM.997 *SEE PREVIOUS CONCURRENCE To receive a copy of this document, indicate in the box C= Copy w/o attachment / enclosure E-Copy with attachment / enclosure N - No copy 0FFICE PM:PD31 E LA:PD31 E SC:EELB* D:PD31 \ 1 NAME TJKim:dbM CJamersodf DThatcher JHannonN DATE 9// 7 97 9/7/97 /j 9/17/97 9fLb7 U0 FICIAL RECORD COPf

.f Northem States Power Company - Monticello Nuclear Generating Plant cc:

J. E. Silberg, Esquire Kris Sanda, Commissioner -

Shaw, Pittman,- Potts and Trowbridge Department of Public Service 2300 N Street, N. W. 121 Seventh Place East Washington DC 20037 Suite 200

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, St. Paul, Minnemta 55101 2145 U.S. Nuclear Regulatory Commission Resident inspector's Omce Adonis A. Noblett 2807 W. County Road 75 Assistant Attomey General Monticello, Minnesota 55362 Omco of the Attomey General 445 Minnesota Street.

Plant Manager Suite g00 Monticello Nuclear Generating Plant St. Paul, Minnesota 55101 2127-l ATTN: Site Licensing

( .' ' Northem States Power Company Mr. Roger O. Anderson, Director l

2907 West County Road 75 Nuclear Energy Engineering Monticello, Minnesota 55362-g637 Northem States Power Company 414 Nicollet Mail

. Robert Nelson, President Minneapolis, MN 55401 ,

- Minnesota Environmental Control '

Citizens Association (MECCA) 1051 South McKnight Road St. Paul, Minnesota 5511g Commissioner -

Minnesota Pollution Control Agency 520 Lafayette Road -

St. Paul, Minnesota 5511g Regional Administrator, Region lli

' U.S. Nuc! ear Regulatory Commission 801 Warrenville Road

- Lisle, Illinois 60532-4351 Commissioner of Health Minnesota Department of Health .

717 Delaware Street, S. E. ,

Minneapolis, Minnesota 55440 Daria Groshens, Auditor / Treasurer ,

Wright County Govemment Center 10 NW Second Street Buffalo, Minnesota 55313 a.nuny ms

= . .-_

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MEETING ATTENDEES N_3png Oraanization T. Kim NRC/NRR D. Thatcher NRC/NRR P. Shemanski NRC/NRR J. Knox NRC/NRR D. Nguyen NRC/NRR P. Mitra NRC/NRR F. Ashe NRC/NRR S. Hammer NLP B. Linde NSP J. Beres NSP l

ENCLOSURE

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