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REGULATORY@JFORMATION DISTRIBUTION S@EM (RIDS)

ACCESSION NBR:8007280489 DOC.DATE: 80/07/21 NOTARIZED: NO FACIL:50-263 Monticello Nuclear Generating Plant, Northern States AUTH,NAME AUTHOR AFFILIATION CLARITYM.H. Northern States Power Co. RECIP.NAME RECIPIENT AFFILIATION

SNAIDER,R, Systematic Evaluation Program Branch

SUBJECT: Forwards NUTECH evaluation of low pressure turbine roll, Results confirm earlier belief that present sys limitations associated w/intermediate range monitors cause 600 psi turbine roll,Mods under review.

DOCKET # 05000263

DISTRIBUTION CODE: A0245 COPIES RECEIVED:LTR /1ENCL SIZE:_ TITLE: 8WR Feedwater Nozzles/Spargers or Control Rod Drive Retu

NOTES:

RECIPIENT ID CO Z/NAME

ACTION: IPPULITO,T.

COPIES LTTR ENCL

1 1

RECIPIENT ID CODE/NAME

KEVERNT,

COPIES LTTR ENCL

i 1

A/D CORE & CS 1 CLEMENSONF. 1 HAZELTUNf. 1 I&E 23 2 KECKERR, 15 1 MATL ENG BR 1 MECH ENG BR 1 PA BR 08 1 RANDALL,P.N, 1 SNAIDER,R. 11 1

ACRS

1 AUX SYS BR 09 1 GEN ISSUES BR 0 HUMFM, 18 2 JOHNSONRICHARD 1 MACKAY,8, 1 MATTU,H, 17 1 NRC PDR 02 1 R-4AZESS BR 1 . 01 1

25 16 16 NSIC

1 1 1 1 1 1 1 1 1

1 0 1 1 1 1 1 1 1

03 1 1

/

TOTAL NUMBER OF COPIES REQUIRED: LTTR

INTERNAL:

EXTERNAL:

39 ENCL 37

NORTHERN STATES POWER COMPANY

Monticello Nuclear Generating Plant

Monticello, Minnesota 55362

July 21, 1980

Director of Nuclear Reactor Regulation Attn: Mr. Richard Snaider, Generic Issues Branch U. S. Nuclear Regulatory Commission

Washington, D. C. 20555

MONTICELLO NUCLEAR GENERATING PLANT

Docket No. 50-263 License No. DPR-22

Evaluation of Feedwater Nozzle Usage Factor for 600 psi and 900 psi Turbine Roll

Enclosed please find NUTECH's evaluation of low pressure turbine roll.

This report is submitted in response to Dick Snaider's request. Follow

ing are some corrections to the report which need to be recognized:

1) 13th line under DESCRIPTION OF STARTUPS on page two, LPRM's should

be IRMs.

2) 1st line of second paragraph under DESCRIPTION OF STARTUPS on

page two, Figure 2 should be Figure 3.

3) 1st line of third paragraph under DESCRIPTION OF STARTUPS on

page two, Figure 3 should be Figure 2.

4) Table 2 should be titled, "Usage Factors in the Feedwater Nozzle

for a Year of Operation."

Results of this report confirm our earlier belief that present system

limitations associated with IRM's cause the 600 psi turbine roll to

render greater nozzle fatigue usage than normal turbine startup. The

need for neutron monitoring system modifications is under consideration.

M. H. Clarity Plt. Supt., Engr. & Rad. Prot.

By: B. .D ,PE Lead Production Engr.

cc: J G Keppler G Charnoff

enclosure

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