ML20034A816
| ML20034A816 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 04/17/1990 |
| From: | Wessman R Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20034A817 | List: |
| References | |
| NUDOCS 9004240382 | |
| Download: ML20034A816 (5) | |
Text
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' UNITED STATES
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s NUCLEAR REGULATORY COMMISSION.
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'j WASHINGTON, D. C. 20655 -
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r VERMONT YANKEE NUCLEAR' POWER CORPORATION.
DOCKET NO. 50-271 l
VERMONT YANKEE NUCLEAR POWER STATION
.l AMENDMENT TO FACILITY OPERATING LICENSE Amendment No. 120 License No. DPR-28' 1.
The Nuclear Regulatory Comissionl(the Comission or the NRC);has found -
that:
A.
The application for amendment filed by;the Vermont-Yankee Nuclear f
PowerCorporation(thelicensee)datedNovember 10, 1989-complies with-
~l the stanot.rds and equirements of the Atomic Energy Act of 1954, as-l amended (the A:t), and the Comission's rules and regulations set?
-forth in 10 CFR Chapter I; B.
The facility will-operate in conformity with the application, the:
provisions of the Act, and the rules and regulations of the j
Comission;.
C.
There is reasonable assurance: (i) that:the activities authorized by this amendment can be: conducted without endangering the-health and safety of the public, and-(ii) that-such activities will be: conducted:
in compliance with the Comission's: regulations set forth in 10 CFR '
Chapter I; D.
The issuance of-this amendment will not be inimical'to the common i
defense and' security or to-the health and. safety of the public; and E.
The issuance of this amendment is in accordance with 10 CFR Part 51 of the Comission's regulations and all applicable requirements have been satisfied.
l 2.
Accordingly, the license is amended by changes to.the: Technical Specifica-tions as indicated in the attachment to this license amendment, and-paragraph 3.B of Facility Operating License No. DPR-28 is hereby amended to read as follows:
Technical Specifications The Technical Specifications contained in Appendix A, as revised through Amendment No.120, are hereby incorporated in the license.
The licensee shall operate the facility in accordance with the Technical Specifications.
9004240382 900417 hDR ADOCK 05000271 PDC
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2-3.
This license amendment is effective as of its date of-issuance.
FOR THE NUCLEAR REGULATORY COMMISSION 1
DRL w
Richard H. Wessman, Director Project Directorate I-3 Division of Reactor Projects I/II-Office of Nuclear Reactor Regulation i
Attachment-Changes to the Technical Specifications Date of Issuance: APR 1 7.1990.
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ATTACHMENT T0-LICENSE AMENDMENT NO.19n b
I FACILITY OPERATING LICENSE N0. DPR-28 i
DOCKET NO. 50-271 t
Replace the following ) ages of the Appendix A-Technical Specifications with-l the attached pages. T1e revised pages are identified by Amendment number and.
contain vertical lines indicating.the area of change.
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Remove Insert
- 111 111 117 117 i
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figure 3.6.i f
ReactorVessel Pressure-Temperature Limitations Volid Thru 4.46E8 NE(t) [32 EFFO Curves are in occordonce iith A usted Reference Temperoture at 1/4T = 89'F 10CfR50 App G ond RG 1.99 Rev 2
- A usled Reference Teaperature at J/4T = 75F A usted Reference Teaperoture at flange = 20'f 1100-h/,
fUpperLimit y
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Region 0
t 60 80-100.110 12 0 -
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-22'0 2(0 260 280 X0 REACTOR C001. ANT TEMPERATURE - oF Amendments No. 52, 51, d$.120 111
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VYWp3 Bases t
3.6 and 4.6 Reactor Coolent System A.
pressure end Temperature Limitettons i
All components in the Beector Cootenti System are designed to withstand the effects.of cyclic 1eede 'due to systemI i
temperature and pressure changes.
and startup and shutdown operettons.These cyclic'loeds are introduced by nesuel'1ood tremetents, roector trips, j
l provided in Section 4.2 of the pSAR. W verloos categories of toed cycles used for destga purposes ers During startup and shutdeum,'the rotes of temperature and pressure ebengee
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ere limited so that the mexinua spectfled heetup and cooldown rates are coasistent' with N deelse eseumptione
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end settsfy the stress limits for cyclic operation.
During heetup ' the thernet gradients in the reector vessel wall pewduce thermal stresses which very from :
compressive et the inner well to tenette et the outer well.
l elleviate the tensile stresses induced by N ic internet pressure.These thesuel Laduced easyresolve stresses tend to Therefore,.e pressero-temperature curve
.beeed on steady-state conditions-(1.e., no thornet stresses) represente a lever bound of all eletter curves for
. i finite heetup rates when the inner well of N vesse!'18 treated as the severslag toestions.
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The heetup enelyste else. covers the deterannation of passeure-temperature limitettees for the seee la totteh the outer well of the vessel becomes the centrotting locetten..The thornet gradiente estabitehed during heetup.
J produce tensite stresses et N outer well of the vessel.
These. stresses are additive to the pressure: Raduced tens 11e stresses which are streedy'present. The thornet induced streceos et the outer we11 of the vessel are i
tensile end are d:;: t t on both the rate of bestop'end the time along the hostep resp; therefore, e lower.
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bound curve similer.to that described for N heetup of the inner unti eennet be defined.
i Subsequently, for the cases in uhtch the outer well of N vessel becomes N etrose centretting locetten, each heetup rete of
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interest unast be enelysed on en individual'beste.
j In order to prevent undue stress on N vessel nossles and bottom head regten, the reelre'ulation leep
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temperatures should be within 500 F of each.other. prior to'startup of an idle loop.
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The reactor vesset materials'have been tested to determine their kaltiot reference temperature all-duettlity trensition temperature,(RTWOT) of 40*p asutsmus, terodiation will eeuse.en increase in the RTggy. Reector operetton and resultant feet neutron (s >l Now)-
4 Therefore, en adjusted reference temperature een be predicted using current industry practices and Vermont Yankee Surveillance progree dete. l(Begelstery Guide 3
1.99, Revision 2, and Bette11e Colustus Laboratory Report BCL 585-84-3, dated Rey 15, 1984.' The ~
. pressure / temperature 11mit curve, pigere 3.6.1,' includes predicted adjustments for this' shift in ETggy for
- operetton through 4.46 x108 g
sensing instruments.
leat(t), se vett es adjustments for poselble errors in the pressure end temperature - u-j-
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