ML18030B240

Proposed Tech Specs Deleting Refs to Charcoal Filter Heaters in Standby Gas Treatment Sys

ML18030B240
Person / Time
Site:	Browns Ferry
Issue date:	04/08/1986
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML18030B239	List: ML18030B237 ML18030B240
References
TAC-61532, TAC-61533, TAC-61534, NUDOCS 8604140264
Download: ML18030B240 (13)

Text

TABLE 3. 2. A PRIMARy COH1AINM IIT, ID REACTOR DUILDIIIG. IA)IATIOh IH TRUHEtITATIOII Hinimum '((o.

Instrument CIIannels Operable Tri Level Settin Action Pesurks er Tri S"s(l) g] Function 1 (12) Inatrument Channel- 2004 F 1. Above trip set tira initiate"

-"

Main Steam Line Tunnel S

Hain Steam Lxre Isolation.

High Temperature Instrument Channel 16 - 1804 F A uve trip setting 1nitiates Reactor Mater Clea:Iup Isol~txoI if Reactor Mater System Ploor Drain C'.04mIp LiI; from R04ctor a:I3 High Temperature  ; eactur N.;ter Return Line.

Instrument Channel 140 - 180oF 1 ~ arne s a:.Jvc Reactor Mater Cleanup Syste~ Space Hiqh Temperature Instrument Channel 5 100 mrlhr or dovnscale G up"cale or 2 dovnscale vill Reactor Building Venti- Init sate GTS lation High Radiation- Isolate reactor "one and Reactor Zone rerueling floor.

c. Clos~ a-oosphere control system.

Instrument Channel IGG mr/hr or dovnscale F 1 upscale cr 2 dovnscale vill Reactor Building Uenti- a. Inrtiare SGTS lation Hiqh Radiation- Iso)ate reiuelI.ng floor.

Refueling Zone c. Close atmosphere control sy" tern' (7) (8) ~ Instrument Channel H and SGTS Flov - Train A R..'l. Heater: S 2000 cfm (A or F)

Hear.er 2elov 200. cim, I.rip setting R.il.

hearer vill shut of f.

2 (7) (8) Instrument Channel H and SGTS Plov - Train B R.H. Heater S 2000 cfm (A or F)

Heater 4elov 2CQO cfn tri p setr,inq R 'l heater vill shut off.

2 (7) (8) Instrument Channel H and SGTS Flov - Train C R.H. Heater 5 2000 cfm (A or F)

Hea'ter aelov 200G cfm, r rip set tinq R.H.

)eater <<ill snur ol1.

SbO+>+O 0 5OOO259'lroqO8 ADOCX gYI P

~l

TABLE 4. 2 ~ h SQRVEILLAHCE RBQOIREHENTS POR PRIHARY COHTAIHNE)rr hHD REACTOR BUILDING ISOLATIOH IHSTRONEHTATIOH

~K( o unct 0 a est Calibration Fr uen nstrumcnt Cbeck Instruaent Channel- (1) (14) (22) ome/3 aonths once/day (S)

Reactor Building Ventilation Biqh Radiation - Refueling Ecne Instrusent Channel- (4) H/h SQTS Train h Beater Instriuaent Channel " (4)

SCTS Train B Beater Instrusent Channel- (4)

SOTS Train C Beater Reactor Building Isolation (4) once/operating cycle 11/h T(aer (refueling floor)

Reactor Building Isolation (4) once/operating cycle H/h Tlner (reactor xone)

PROPOSED CHANGES UNET 2

TABLE 3. 2. A g~

PRIHARY COHTAINHEt>>T At>>D REACTOR BUILDIHG ISOIATIDH It>>STRUHEHTATIOtt Hinimum 1'o.

Instrument Channels Operable Function Tri IA.'vel Settin Action 1 Qevi>>rks

-'12) Instrument Channel " 2004F 1. Above tri p set t Inn initiate"

)tain Stean Line Tunnel >>tarn Steam Lane Isolation.

High Temperature Instrument Channel 180 - 180aF 1. A'ovi trlti .ettlng 1n)tiates Reactor Water Clea.>>up Isoiwt tvv >f Reactor water System Floor Drain C ean>>>>p Ll>>;. f rom Reactor an)

High Temperature P eactor Water Return Line.

Instrument Channel- lo0 - 180oF 1 arne aS a.'.OVC Reactor water Cleanup System Space Uiqh Temperature Instrument Channel- 5 100 mrlhr or downscale 1. 1 upscale or 2 downscale will Reactor Building Venti- Init sate SG'IS lation High Radiation >> Isolate eactor "one and Reactor Zone retue)i>>>>g floor.

c. Clos>' oosphere control system.

Instrument Channel 100 mrlhr or downscale F l. 1 upsca)e cr 2 downscale vill Reactor Building Venti- a. Initiare SGTS lation High Radiation- Iso)ati refueling floor.

Refueling Zone c. Cio=e atmosphere control system' (7) (8) - Instrument Channel U and SGTS Flow - Train A R.'.I. Heater S 2000 cfm (A or F)

Heater Below 203: cim, trip setting R.il.

heater wili Shut Off.

2 (7) (8) Instrument Channel H and SGTS Plow - Train B R.H. Heater S 2000 cfm (A or Heater elov 2C00 cfm, trip setting R.H.

heater. will shut of f.

2 (7) (8) Instrument Channel H and SGTS Flow - Train C R.H. Heater 5 2000 cfm (A or r)

Heater ae)ow 2000 cfm, trip setting <<. H.

heater will shut otf.

e J ~ l ~

TABLE 4>2.A SURVEILLAHCE RR)OIBENEHTS POR PRIHARY COHTAIHHEHT AHD REACTOR BVILDIHQ ISOLATIOH IHSTROHEHTATIOH Calibration Fr uen Instrument Cheek InetruaLent Channel- ()) () 4) (22) once/3 nontho once/day (8)

Reactor Building Ventilation Sigh Radiation Refueling Eche Instrument Channel- (4) (g) H/A SOTS Train A Beater Instrument Channel- (4)

SGTS Train B Beater Inntrucsent Channel-SQTS Train C Beater-

'(4) H/A 0 Reactor Building Isolaticn (4) once/operating cycle Thaer (refueling floor)

Reactor Building Isolation (4) once/operating cycle ~ H/A Tiuer (reactor xone)

PROPOSED CHANGES UNIT 3

TAIII.E 3. 2.A PRIHARy COWTAIVHHT A:ID I<EACTOft UOILDIttG ISOIATIOH IttSTRUHEttTATIOtl H]nimum 't'o.

Instrument Cltannels Operable p>> T>>~5:>(1) )> Function Tri Level Srttin >e>>on~1 Re~ rks

(]4) Instrument Channel 160 - 180~F l. A'vvv trit> -cttlrq 1nttiatcs Reactor ttater cleanup !roi~tt~t >f Reactor Mater System Floor Drain C'.eanut Ltn from Reactor ate)

High Temperature ?cactor >>..!cr Return Linc.

Instrument Channel lo0 - 1804? 1. 'i~e 0:>. ove Reactor Mater Cleanup System Space Hiqh Temperature Instrument Channel 5 100 mr/nr or domscalc G 1 up"cale or 2 downscale will Reactor Building 33enti- Initxatc SGTS laticn High Radiation- h. Isolate eactor 'ne and Reactor Zone r e rue I inq f 1 oor.

c. Clos< at,oosphere control system.

Instrument Channel- 100 mr/br or downscale F 1 upscale cr 2 downscale will Reactor Buildinq Itcnti- Initiate sGTs lation Hiqh Radiation- I oldt< reiuelrng floor.

Refuelinq Zone c. Close atmosphere control sy" tern' (7) (8) Instrument Channel H and SGTS Flow - Train A R.H. Heater. < 2000 cfn (A or F)

Heater Below 200". cim, trip settinq R.H.

heater vill st>ut off.

2 (7) (0) Instrument Channel H and SGTS ?low - Train B R.H. Heater < 2000 cfm (A or F) villcfm,shuttrip setting l3cater Below 2COO R.H.

heater off.

2(7) (8) Instrument Channel H and SGTS Flow - Train C R.H. Heater 5 2000 cfm (A or F)

Heater ~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 b ation r uen Instrument chez}c Instrmeent Channsl- (1) ('I4) (2>) ore:o/3 nonths once/day {8)

Reactor Building Vcntklatica High Radiation - Refueling Xone Instruct Channel- (4) (9)

SGTS Train A Beater.

Instant SGTS Train Channel-B Beater

{4) {9)

I Instrnnent Channsl- (41 (9) l SGTS Train C Beater .

Reactor Building Isolation {4) once/operating cycle Tiner {refueling floor)

Reactor Building Isolation. (4) once/operating cycle Tinar {reactor sons)

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

tW l

p