ML20125A506

Responds to Technical Assistance Request for Review of Proposed Change in Plant pressure-temp Limitations for Operation

ML20125A506
Person / Time
Site:	Monticello
Issue date:	08/19/1975
From:	Maccary R Office of Nuclear Reactor Regulation
To:	Goller K Office of Nuclear Reactor Regulation
References
NUDOCS 9212080372
Download: ML20125A506 (2)

Text

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1 AUG 19 U75 i .

Earl R. Goller, Assistant Director

"; for Operating Baaetore '

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Division of Raastor u aanaing ,

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MONTICEL1h NUCLEAR GENERATING 1"LANT - RE i REQUEST LIMITATIONS FOR OPERATION.- (TAR-1760) - REVIEW PROPOSED CHANGE ICAL ASSISTANCE URE-TEMPERAltTRE IN NONT i

Plant Name Monticello l Docket Number: 50-263 j Responsible Branch and Project Manager:

Raquested Completion Date: ORB-2; B. Buckley i

August 20, 1975 Technical Baview Description of Raquest: Branch Involved:

Naterials Engineering Branch Review Proposed Change in Monticello's Review Status: Complete Pressure-Temperature Limitation for Operation

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{ Section of the Meterials Engineering , the HaterialeBranch PerformancehaIn re and core operation proposed by Northern Amendment Request dated July 1, 1975.

, heatup, cooldown States Ppre ower Company in License l

i The current pressure-temperature limitations f .

are based on HDT temperature plus 60*F and do notor operation of Montice requirements Raquirements." of Appendia G,10 CFR Part comply 50, "_with Fracture all the T

! oughness l based on the requirements of Appendix GThe proposed are pressure-t ASME Code Section III.

reference temperature, RTIn calculations'to'determina these limits the. 10 j

this vessel was designed and 1966 Addenda). mente manufactured of the Code to which (1965

'j reference temperature used was' the MDT n, the temperatureWh NDT-temperature was not known, the reference't .- Where-the dropweight.-

temperature at which 30 ft-lb of energy wa emperature used was-the

! of reported Charpy V notch test data. s expected to occur on the basis j the vessel purchase specification vessel emperature permitted by for anyfrom the co l material certified test is +40'F results.- and this value is used for the'RTPressure boundary

1. in lieu of

-j Predicted are given inchanges-in Figure 3.6.1.MDT temperature as a fu nction of neutron flancos.

This curve is based en 35 data points from n i

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9212000372 750819 '

PDR ADOCK 05000263.

.p PDR

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! c Karl R. Coller . [

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D tests on SA 302B and SA 533B steel. Itag$eeswithourpredictionfor

SA 5335 steel with 0.15% copper. The percent of copper in the Monticello i reactor vessel plate material from the beltline region has not been

, j determined.

I i' Calculations indicate that the maximum neutron fluence on the vessel wall is presently about 2 x 1017 n/cm2 and will be approximately 2.2 x 10 d n/cm2 at and of life.

! The material surveillance program for Monticello consists of three sets of specimens representing the vessel base, weld and HAZ material and conforms to ASTM E 185-66. Northern States Power Company proposes to change the withdrawal schedule to withdraw samples at 1/4 and 3/4 of i service life.

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! We conclude that the proposed temperature-pressure limits for operation

of Monticello comply with the requirements of Appendix G, 10 CFR Part 50 l and are acceptable until data from the first material surveillance-capsule are obtained and reported to the NRC. We recommend that the Ph osphorus and copper content of vessel plate and weld material in the-vessel core region be determined at that time, and the results included in the report. We also conclude that the proposed changes in surveil- ,

lance requirements, specifications 4.5.A and B, are acceptable.

Details of our evaluation including calculations for operating limits are available in MTEB Branch files.

, pgghialdruediF Lp.m. usum .

R. R. Maccary, Assistant Director for Engineering

, Division of Technical Review

, l Office of Nuclear Reactor Regulation ec: R. E. Heineman, TR DISTRIBUTION:

R. S. Boyd, RL Docket File (50-263)

W. G. Mcdonald, MIPC -NRR Reading File D. L. Zimmann, RL MTEB Reading File B. Buckley, RL RE 1.1-1 S. S. Pawlicki, TR R. M. Gustafson, TR U. Potapovs, TR

-W. S. Baselton, TR K. G. Hoge, TR Materials Performance Section, TR o,, e > TR: F TR MT. TR:MTEB  :

.w..., K a 2 on ,

SSPa la ry onre > 8/18/75 87/d. f./,/75 8/a/75

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8/te/75

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Forum ABC.318 (Rev. 9 5)) AECM 0240 W u. s. soVERNMENT PRINTING OFFIC E31974 326-104

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