ML18030B240
| ML18030B240 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 04/08/1986 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML18030B239 | List: |
| References | |
| TAC-61532, TAC-61533, TAC-61534, NUDOCS 8604140264 | |
| Download: ML18030B240 (13) | |
Text
Hinimum'((o.Instrument CIIannels Operable er Tri S"s(l)g]Function Tri Level Settin Action 1 TABLE 3.2.A PRIMARy COH1AINM IIT, ID REACTOR DUILDIIIG.
IA)IATIOh IH TRUHEtITATIOII Pesurks-" (12)Inatrument Channel-Main Steam Line Tunnel High Temperature S 2004 F 1.Above trip set tira initiate" Hain Steam Lxre Isolation.
Instrument Channel Reactor Mater Clea:Iup System Ploor Drain High Temperature Instrument Channel Reactor Mater Cleanup Syste~Space Hiqh Temperature Instrument Channel Reactor Building Venti-lation High Radiation-Reactor Zone Instrument Channel Reactor Building Uenti-lation Hiqh Radiation-Refueling Zone 16-1804 F 140-180oF 5 100 mrlhr or dovnscale G IGG mr/hr or dovnscale F A uve trip setting 1nitiates Isol~txoI if Reactor Mater C'.04mIp LiI;from R04ctor a:I3;eactur N.;ter Return Line.1~arne s a:.Jvc up"cale or 2 dovnscale vill Init sate GTS Isolate reactor"one and rerueling floor.c.Clos~a-oosphere control system.1 upscale cr 2 dovnscale vill a.Inrtiare SGTS Iso)ate reiuelI.ng floor.c.Close atmosphere control sy" tern'(7)(8)~Instrument Channel SGTS Flov-Train A Hear.er R..'l.Heater: S 2000 cfm H and (A or F)2elov 200.cim, I.rip setting R.il.hearer vill shut of f.2 (7)(8)Instrument Channel SGTS Plov-Train B Heater H and R.H.Heater S 2000 cfm (A or F)4elov 2CQO cfn tri p setr,inq R'l heater vill shut off.2 (7)(8)Instrument Channel SGTS Flov-Train C Hea'ter R.H.Heater 5 2000 cfm H and (A or F)aelov 200G cfm, r rip set tinq R.H.)eater<<ill snur ol1.SbO+>+O 5OOO259'lroqO8 ADOCX 0 P gYI~l TABLE 4.2~h SQRVEILLAHCE RBQOIREHENTS POR PRIHARY COHTAIHNE)rr hHD REACTOR BUILDING ISOLATIOH IHSTRONEHTATIOH
~K(o Instruaent Channel-Reactor Building Ventilation Biqh Radiation-Refueling Ecne Instrusent Channel-SQTS Train h Beater Instriuaent Channel" SCTS Train B Beater unct 0 a est (1)(14)(22)(4)(4)Calibration Fr uen ome/3 aonths nstrumcnt Cbeck once/day (S)H/h Instrusent Channel-SOTS Train C Beater Reactor Building Isolation T(aer (refueling floor)(4)(4)once/operating cycle 11/h Reactor Building Isolation Tlner (reactor xone)(4)once/operating cycle H/h PROPOSED CHANGES UNET 2 Hinimum 1'o.Instrument Channels Operable g~Function Tri IA.'vel Settin Action 1 TABLE 3.2.A PRIHARY COHTAINHEt>>T At>>D REACTOR BUILDIHG ISOIATIDH It>>STRUHEHTATIOtt Qevi>>rks-'12)Instrument Channel")tain Stean Line Tunnel High Temperature 2004F 1.Above tri p set t Inn initiate">>tarn Steam Lane Isolation.
Instrument Channel Reactor Water Clea.>>up System Floor Drain High Temperature Instrument Channel-Reactor water Cleanup System Space Uiqh Temperature Instrument Channel-Reactor Building Venti-lation High Radiation>>Reactor Zone Instrument Channel Reactor Building Venti-lation High Radiation-Refueling Zone 180-180aF lo0-180oF 5 100 mrlhr or downscale 100 mrlhr or downscale F 1.A'ovi trlti.ettlng 1n)tiates Isoiwt tvv>f Reactor water C ean>>>>p Ll>>;.f rom Reactor an)P eactor Water Return Line.1 arne aS a.'.OVC 1.1 upscale or 2 downscale will Init sate SG'IS Isolate eactor"one and retue)i>>>>g floor.c.Clos>'oosphere control system.l.1 upsca)e cr 2 downscale vill a.Initiare SGTS Iso)ati refueling floor.c.Cio=e atmosphere control system'(7)(8)-Instrument Channel SGTS Flow-Train A Heater R.'.I.Heater S 2000 cfm U and (A or F)Below 203: cim, trip setting R.il.heater wili Shut Off.2 (7)(8)2 (7)(8)Instrument Channel SGTS Plow-Train B Heater Instrument Channel SGTS Flow-Train C Heater R.H.Heater S 2000 cfm R.H.Heater 5 2000 cfm H and (A or H and (A or r)elov 2C00 cfm, trip setting R.H.heater.will shut of f.ae)ow 2000 cfm, trip setting<<.H.heater will shut otf.
e~l~J TABLE 4>2.A SURVEILLAHCE RR)OIBENEHTS POR PRIHARY COHTAIHHEHT AHD REACTOR BVILDIHQ ISOLATIOH IHSTROHEHTATIOH InetruaLent Channel-Reactor Building Ventilation Sigh Radiation Refueling Eche Instrument Channel-SOTS Train A Beater Instrument Channel-SGTS Train B Beater Inntrucsent Channel-SQTS Train C Beater-Reactor Building Isolaticn Thaer (refueling floor)())()4)(22)(4)(4)'(4)(4)Calibration Fr uen once/3 nontho (g)once/operating cycle Instrument Cheek once/day (8)H/A H/A 0 Reactor Building Isolation Tiuer (reactor xone)(4)once/operating cycle~H/A PROPOSED CHANGES UNIT 3 H]nimum't'o.Instrument Cltannels Operable p>>T>>~5:>(1))>Function Tri Level Srttin>e>>on~1 TAIII.E 3.2.A PRIHARy COWTAIVHHT A:ID I<EACTOft UOILDIttG ISOIATIOH IttSTRUHEttTATIOtl Re~rks (]4)Instrument Channel Reactor ttater cleanup System Floor Drain High Temperature Instrument Channel Reactor Mater Cleanup System Space Hiqh Temperature Instrument Channel Reactor Building 33enti-laticn High Radiation-Reactor Zone Instrument Channel-Reactor Buildinq Itcnti-lation Hiqh Radiation-Refuelinq Zone 160-180~F lo0-1804?5 100 mr/nr or domscalc G 100 mr/br or downscale F l.A'vvv trit>-cttlrq 1nttiatcs!roi~tt~t>f Reactor Mater C'.eanut Ltn from Reactor ate)?cactor>>..!cr Return Linc.1.'i~e 0:>.ove 1 up"cale or 2 downscale will Initxatc SGTS h.Isolate eactor'ne and r e rue I inq f 1 oor.c.Clos<at,oosphere control system.1 upscale cr 2 downscale will Initiate sGTs I oldt<reiuelrng floor.c.Close atmosphere control sy" tern'(7)(8)Instrument Channel SGTS Flow-Train A Heater R.H.Heater.<2000 cfn H and (A or F)Below 200".cim, trip settinq R.H.heater vill st>ut off.2 (7)(0)2(7)(8)Instrument Channel SGTS?low-Train B l3cater Instrument Channel SGTS Flow-Train C Heater R.H.Heater 5 2000 cfm H and (A or F)H and R.H.Heater<2000 cfm (A or F)Below 2COO cfm, trip setting R.H.heater vill shut off.~claw 200G cfm,-.ri p sc'ing R.H.heater will shut oft.
y TABLE 4~2 A SURVEILLANCE REQUIREMENTS POR PRINARY CONTAINMENT AND REACTOR BUILDING ISOLATION IHSTRUNEtG'ATION
~~co Instrmeent Channsl-Reactor Building Vcntklatica High Radiation-Refueling Xone Instruct Channel-SGTS Train A Beater.Instant Channel-I SGTS Train B Beater Instrnnent Channsl-l SGTS Train C Beater.Reactor Building Isolation Tiner{refueling floor)(1)('I4)(2>)(4){4)(41{4)b ation r uen ore:o/3 nonths (9){9)(9)once/operating cycle Instrument chez}c once/day{8)Reactor Building Isolation.
Tinar{reactor sons)(4)once/operating cycle
ENCLOSURE 2 Description and Justification (TVA BFNP TS 219)Description of Change References to the charcoal filter heater for each Standby Gas Treatment System (SGTS)train are to be deleted from Table 3.2.A and Table 0.2.A (pages 56 and 86, units 1 and 2;pages 58 and 89;uni,t 3).These references are in the remarks column corresponding to SGTS Flow Instrument channel for each SGTS train.Also"heaters" is being changed from plural to singular for each SGTS train.Reason for Change The charcoal filter heaters referenced in these tables have been deener-gized and are being removed from the SGTS design.Therefor e it is no longer correct to reference these heaters in the technical specifications.
Justification for Change Each of the SGTS trains was originally equipped'ith two types of heaters;relative humidity heaters which operate during blower operation and charcoal filter heaters which operate during standby conditions.
Both types of heaters are designed to prevent moisture buildup in the charcoal filters.This proposed amendment to Browns Ferry units 1, 2, and 3 technical specifications will delete references to the charcoal filter heaters for each SGTS train.These heaters were originally intended to ensure that the charcoal adsorber beds do not experience significant moisture buildup during standby conditions, but subsequent analysis has determined that operation of each train with its associated relative humidity heater on for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> each month is sufficient to control moisture buildup.This determination, which is consistent with the guidance of Regulatory Guide 1.52 Revision 1 (1978), forms the basis for the section 0.7.B.2.d of the current Browns Ferry technical specifications.
Based on this determination, the charcoal filter heaters have been deenergized and are being removed from the SGTS design under the provision of 10 CFR 50.59, and hence are no longer controlled by the instrumentation listed in Table 3.2.A.The calibration frequencies, instrument checks, and setpoints for these instruments remain unaffected by this proposed amendment.
Rather, only references to a piece of equipment which essentially no longer exists will be deleted.L35325.S2 ENCLOSURE 3 Determination of No Significant Hazards Consider ation (TVA BFNP TS 219)Description of Amendment Request This proposed amendment to Browns Ferry units 1, 2, and 3 technical specifications will delete references in the reactor building isolation instrumentation table to charcoal filter heaters which are being removed from the Standby Gas Treatment System (SGTS)design.Basis for Proposed Determination of No Significant Hazards Considerations The proposed revision will eliminate references by heater control instruments to heaters which are no longer operative, and hence the amendment will not increase the probability or consequences of any analyzed accident since the heaters themselves are no longer required.No new activities or equipment are involved, so that no new, unanalyzed accident condition is introduced.
Finally, the performance of the SGTS is not affected so that no margin to safety as defined in the bases of the technical specifications is reduced.Based on these conclusions, we propose to determine that the requested license amendment involves no significant hazards consideration.
L35325.S2 l p tW