ML20096D332
| ML20096D332 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 05/08/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20096D324 | List: |
| References | |
| NUDOCS 9205150230 | |
| Download: ML20096D332 (2) | |
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UNITED STATES
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'h NUCLEAR REGULATORY COMMISSION 5
a E WASHINGT ON, 0. C. 2055b
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SAFETY EVALUATI0t: EY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT N0.133 TO FACILITY OPERATING LICENSE N0. DPR-28 VERM0 lit YANKEE NUCLEAR POWER CORPORATION VERM0t:T YANKEE NUCLEAR POWER 51ATION D0CKET I:0. 50-271 1.0 It!TRODUCTIOil By letter dated Decerber 23, 1991, the Vermont Yankee Nuclear Power Corpc aticn (the licensee) suboitted a request for a change to the Vernont Yankee Nuclear Power Statich Technical Specifications (TS). The requested charge would extend the calibration interval for the high steam line flew instruc.ent6 tion fron, quarterly to once each operating cycle.
2.0 EVALUATION Eeplecing the existing hi h stean line flow differential pressure switchcs with g
analog loop instrunentatirn will replace r.,echanically-actuated components with newer and more reliable equipment.
This new instruuentation will maintain the i
rece red redundancy and protective functions.
The new instructentation is also environmentally and seism cally qualified.
i The proposed change in calibration frequency f rec qearterlj to once each operating cycle will continue to raeet the intent of Technical Spec 4fication requirerrents fer assuring cnn.ponent operability.
Experience at Vermont Yankee w th sinilar analog loop i strumentation over the past 11 years tas shewn ttis n
equipment to have an excellent operstN.3 n: story.
Plant safety would be enhanced by reducing the frequency of calibrations to once eat'a operating cycle. This would albw calibration to be performed during shut down, thus minimizing the potential for challenges to plant safety systems during operation.
The requested change to the calibration frequency does not impact any FSAE safety analysis, nor does it involve any change in Technical Spec 4ficaiden setpc#nts, plart operation, protective functions or the design basis of the plu.t.
l' ore reliable protect'.vo 'nstrumentation will provide continued assurance that required control and alaim functions are tc.a M a ned to prevcnt i
unctvering the fuel frcr ins er.tery loss due tc a worst case main steam lir.e breal.
it c pycrosed chtr ge has t en rev ewec'
'te ritr+ Cperftions Fev ew Corr 4ttee i
4 att the Yet r c nt Yankee i.t.c la.: h it.ty v.t ard Eet #eb Comrittec.
9205150230 920508 PDR ADOCK 05000271 P
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2-3.0. 5,gTE CONSULTATION In accordance with the.Comm!ssion's regulations, the Vermont State official was nctified of the proposed issuance of the amendment.
The State official had no comments, d.0.
ENVIRONMENTAL,CONSIDEPAT1,0N The amendment. changes a requirement with respect to installation or use of a facility con.ponent located within~ the restricted area as defined in 10 CFR Part 20 and changes a surveillance requirement. The NRC staff has deterrdned Ethat the amendrcent-involves no s nificant increase in the amounts, and no sigr ificarit-change iri <ne types, f any effluents that r.ay be relecsed cf fsite, and-that there is rio significant increase in individual or cumulative
=nccupational-radiation exposure. The Commission has previously issued a
. proposed findir g = that the amendment involves no significant hazards consideration, and there has-beer, r.o public corraent on such finding (FR cite). Ac cordingly,
the ar..endr.er.t meets the eligibility or iteria for categorical exclusion set gforth in 10 CFR 51.2F(c)(9).
Pursuant to 10 CFP 51.22(b) rio environrier.tal in: pact 1statenent or environner.tal assessment need be prepared in connection with the issuance of the aniendnent.
5.0. CONCl.USION The Con. mission has concluded, based on the considerations discussed above, that:
(1) there is reascnable assuranct that the health and safety of the
_public will nct be endangered by creration in the proposed manrcr, (E) sect
-activities will be conducted in compliance with the Commission's regulations,
- and (3)-the' issusnce of the.amendnent will nct be inimicai to the common defense and security or to the health and sefety of the public.
Print' pal Contributot5:
P. M. Sears L E. F. Trottier Date:
May 8, 1992 y
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