ML20059F180
| ML20059F180 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 08/30/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20059F174 | List: |
| References | |
| NUDOCS 9009110123 | |
| Download: ML20059F180 (4) | |
Text
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UNITED STATES E. a.
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4 SAFETY EVALUATION BY THE OFFICE OF. NUCLEAR REACTOR REGULATION RELATED TO. AMENDMENT.NO.g.TO FACILITY OPERATING L CENSE.NO. NPF.43 DETROIT.EDISONzCOMPgy FERMI-2 DOCKETNO.50;39
1.0 INTRODUCTION
Sy letter dated Septeniber 21,1988, the Detroit Edison Conpany (Deco or the i
licenste) requested an an.endment to the Technical Specifications (TS) appended to Facility Operating License No. NPF-43 for Fermi-2. The proposed anendnent wouldreviseTSSection3/4.3.4,AnticipatedTransientWithoutScram(ATWS)
Rerirculation Pump Trip System Instruntentation. The proposed TS changes pcVide appropriate provisions for the two-out-of-two trip logic and will allow the Fermi-2 TS to better reflect the as-built plant design.
-2.0 EVAtUtTION Tb Section 3/4.3.4 specifies instrutnentation and surveillarce requirements for theanticipatedtransientwithoutscramrecirculationpumptrip(ATWS-RPT) system. The ATWS-RPT system consists of two se)arate and redundant trip systen.s.
Each trip systen. r.onsists of four chnnels; eac1 channel containt one instrument.
Twn (bannels monitor Reactor Water Level and two channels monitor Reactor Pressure. The ATWS-RPT is activated with two-out-of-two being satisficd on eitl+r Feactor Vessel Pressure - High or Reactor Water level Low - Level 2, causing the Motor Generator (MG) set field breakers to open resulting in the Recirculation Pumps tripping.
9 With one :hennel in a trip system inoperable the current TS do not nire the ineptrable channel to be placed in the trip position, and io not re v any action to be taken for up to 14 days. et which time the 55 require the reactor to be shut dcwn. Most safety related instrumentation systems in the TS (i.e.
Reactor Fwtection System, Emergency Core Cooling System Instruroentation) require inoperable channels to be placed in the trip position in a short pericd of tiine following discovery at, long as the action will not cause a reactor trip.
The current TS covering the ATWS-RPT also does not centain any provisions for trc Can one channel per trip systen. to be inoperable.
If one channel becomes anoperabh the TS allow 14 days to repair the inoperable channel; however, if another chani.1 in the same trip system becones inoperable the current TS do not allow for this provision and would require entry into Section 3.0.3 of the TS, even though the redundant trip system n.ay be fully operable. Entry into Section 9009110123 900830 PDR ADOCK 05000341 P
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3.0.3 of the TS requires prorpt action to shut down the reactor, since it is presurned that en f.sstr.tial safety function is lost.
Such action will result in cht.11enges to plant safety systems. The current TS require such action be taken even though the redurdont trip systet n.ay be full.v operable.
The propost-d changes to the TS bring the Fermi-2 TS more in line with the BoilingWaterReactor(CWR)StandardTechnicalSpecificationconcerningATWS-RPT.
i The proposed charge will replace the existing two action statenents with four
- l 6ction staterntnts. The proposed change requires that if the nun.her of operable chennels is one less than the nur.ber required by the ininimun. opereble channels per trip systern, the inopersble channels or channels shall be placed in the tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. This action is more conservative the. required by the current TS. The existing TS allow 14 days prior to any action beitg ta ken. The proposed change also addresses the condition where two inoperable cb6hnels exist in the sanie trip system. The proposed change either requires the inoperable channels be placed in the trip condition or the trip system be dec16ted incperable, ar.d allows 72-hours to repair the trip system prior to cor..roentir g with 6 r e6ctor shut down as 10:g as the redundant trip system is o?trable. Theproposedchangepreciudesthesituationwheretwoinoperable caer.r.els uist in the sene trip system and Section 3.0.3 of the TS h 3 to be q
i entered. The proposed thenge alsn niales provisions for the inoperability of two trip systens simultaneously.
If two trip systen:s are inoperable the proposed TS ellchs only I hour to restore one trip system to operable prior to reciuiring the ' e6ctor to start shutting down and be in STARTUP within the next 6-hcurs. Thi is similar to the requirements of Section 3.0.3 of the TS.
The proposed TS better reflect the ATWS RPT plant design and the EUR Standard TS rtquiren,ents for the ATUS-RPT system.
In addition, the proposed change ttriuires that the plant be plactd in a safer condition upon the discovery of inoperable it.strunentation channels of trip systems.
Based on the abcse evaluation the staff finds the proposed changes are acceptable.
3.0 ENVIP0 MEldAL L N 1DERA110N j
This amendment involves a change in the requiren.ents with respect to the f
instt116 tion or use of a facility con.ponent located within the restricted area as. defined in 10 CFR Part 20 ond changes in surveillence requirements. We h6ve deternir.ed th6t this en.eridrant involves no significant incuase in the enounts, 4
and no significant thange in the types, of any effluents which niay be released offsite, 6nd that there is no si occupational radiation exposure.gnificant increase in individual or cunulative i
The Conunission has previously issued a
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.proposedfindingthatthisan.er.4entinvolvesnoshnificanthazards considtretion and there has betw no public nonnent on such findirig.
Accordingly, this arnendr:cht racets the eligibility criteria for categorical exclusion set forth ir10CFR51'.22(c)(9).
Pursuant to 10 CFR 51.22(b), no environinental impas :
stoterent or environner,tal assessinent need be prepared in connection with the-isst.ance of this Entodnent.
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4.0 CONCLUjION We have concluded, based on the considerations discussed above, that: (1)there is reascnable assurance that the health and safet of the publir will not be i
endangered by operation in the proposed manner,s(y) such activ' 2
i be conducted in cor.pliance with the Commission reguletians,and(3)the issuance of this an(ndn.ent will nct be inimical to the common defense and i
security or to the health anu safety of the public.
Principal Contributor: John Stang Date: August 30, 1990 1
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August 30, 1990 Docket No. 50-i 1 DISTRIBUTION Docket Fi W JStang)
GHill(4 Mr. William S. Orser NRC & Local PDRs Senior Vice President - Nuclear PD31 R/F Wanda Jones i
Operations JCalvo EJordan Detroit Edison Cornpany JZwolinski ACRS-(10) 6400 North Dixie Highway PShuttleworth GPA/PA Newport Michigan 48166 OGC ARM /LFMB DHagan
Dear Mr. Orser:
SUBJECT:
AMEN 0 MENT N0. 55 TO FACILITY OPERATING LICENSE NO. NPF-43:
l (TACNO.69836)
The Comission has issued the enclosed Amendr.ent No. 55 to facility Operating License No. NPF-43 for the Fermi-2 facihty. -This amendment consists of char.ges to the Plant Techt.ical Specifications in response to your letter dated September 21, 1988.
TheamendnentrevisesTechnicalSpecification(TS)3/4.3.4, Anticipated Tr6nsitnt Without Scram Recirculation Pump Trip System Instrurnentation. The-proposed TS changes provid'; erpopriate provisions for the two out-of-two trip logic ar.d will allow Fermi-2 TS to better reflect the as-built plant design.
l A copy of the Safety Evaluation supporting this wen;nient is clso en*losed.
Notict of issuance will be included in the Comist.cn's biweekly Federal Register notice.
Sincerely, l
OriginalSlgnedby l
John F. Stang, Project Manager Project Directorate. 111-1 Division of Reactor Projects - III, i
IV, V & Special Projects l
l Off'ce of Nuclear Reactor Regulation t
Enclosures:
1.
Amendrrent No. 55 to NFF-43 2.
Safety Evaluation cc w/enclosuras:
See next per.
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