ML19338D118

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Proposed Changes to Tech Specs Clarifying Requirements for RHR Svc Water Sys & Adding Spec Which Allows Standby Coolant Capability to Be Inoperable for Period Not to Exceed 10 Days
ML19338D118
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 09/17/1980
From:
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML19338D113 List:
References
NUDOCS 8009190495
Download: ML19338D118 (10)
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Text

{{#Wiki_filter:. 'w __,e-ENCLOSURE 1 PROPOSED CliANGES TO TECHNICAL SPECIFICATIONS BROWNS FERRY NUCLEAR PLANT (DOCKET NOS. 50-259, 50-260) . 8009190.ST U

-f + r UNIT 1 PROPOSED CIIANGES 4 i l .1

c ~ e-a e s: s 7 t,1 KITING CONDITIONS' FOR OPERATICN SURVEILI.ANCE REOUIREMENTS-3.5.C RNR Sci'vice Vater and Energif y '" 4.5.C PNR Service Wate_r and Eterrency mm Equipment Cooling Water Systers $ntpmeec Coolinit Water Systw ( ETC'45 ) (Continued) (EEC45) (Continue.1)_ 2. During 'pover olieration. 2. a. If no more than tu RHR5W pumps must be RJIR$W punps~ are inop-operable and assigned. erable, increamed to service as indicated surveillance is not below for the specified required. tiee limits. b. When three RHRSV pu=ps'. are inoperable, the-remaining pumps, asso-t f1ME MINIMUM ciated essential con-Jf.IMIT. . SERVICE ASSIGNMINT trol valves, and asse- '(DAYS) RHRSW EECW** ciated diesel genera-8 8 parated Indefinite 7* 3a weekly. 30 7* or 6**a 2* or 3*** c. When four RHRSV pumps are inoperable, the 7 6* 2* remaining pumps, auo-cisted essential con-trol valves, and asse-

  • At least one operable pump must be ciated diesel genera-assigned to each header.

tors shall be operated

    • 0nly autenatically starting pumps may be assigned to EECW header service.
      • Nine pumps must be op,erable. Either configuration is acceptable 7 and 2 or 6 and J.

3. During power oper-3. Routine surveillance for ation both RHR$W pumps D1 these pumps is specified .and D2 normally or alter-in 4.5.C.1. nately assigned-to the RHR heat exchanger header supplying the standby coolant : supply connection must be operable except_as specified in 3.3.C.4 and '3.5.C.5 beloW. m 01I1 D) _a 152 i k ^ b, ) u y

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'l.. LIMITING CONDITIONS 19R OPERATICN SURVEILLANCE REGUIRDENTS 3.5.C ~(Continued) 4.5.C (Continued) ] ~ 4 When it is determined that. 1 44. One of ' the Di.or D2 one of the RHnSW pu:-ps sup - RilRSil pumps assigned to plying standby coolant is .t e RilR heat exchanger inoperable at a tioe when h operability is required, the supplying'the standby operable RHASV pe:sp on the coolant supply connection same header and its asso- - may be inoperable for a ciated diesel generator and- ~ period not to exceed the RRR heat exchanger 30 days provided the header and associated essen-operable pump is tial control.valvss shall aligned to supply the. be demonstrated to be RHR heat exchanger-operable immediately and header and the every 15 days thereafter. associated diesel generator and essential control . valves are operable.

5. 'The standby coolant

- supply capability may be inoperable'for a . period not to exceed ten days.. ' 6 '. If' specifications 3.5.C.2 through 3.5.C.5 are not met, an orderly shutdown shall be initiated-and the unit placed in the cold shutdown condition within 24 . hours, g 1. There shall be at VV p"Q"}[ least 2 RiiRS11 pumps, l ' associated.with the nt ' selected RilR pumps, JL . i .A. "3 . aligned for RHR heat exchanger' service for each reactor vessel .containing irradiated fuel. 1 -.153 ~ 1 s r .c,. i., m m

rn-3.5 BASES Should the capability for providing flow through the cross-connect linen .be lost, a ten day repair time is allowed before shutdown.is required. This repair time is justified based on the very small probability for ever needing RHR pumpu und heat exchangern to supply an adjacent unit. . ffritTHEUCES 1. Residual Heat Removal System (BFDP FSAR subsection 4.8) P. Core Standby Cooling Systems (itFNP FSAR Ceetion 6)

3. % C RHH Service Unter System and !lMercency Equipment Cooline Unter Cynten (EE.G)

There are two EECW headers (north and south) with four automatic starting RHRSW pumps on each header. All componei.ts requiring emergency cooling water are fed from both headers thus assuring continuity of operation if either header is operable. Each header alone can handle the flows to all components. Two RHRSW pumps can supply the full flow requirements of all essential EECW loads for any abnormal or postaccident situation. There are four RHR heat exchanger headers (A, B, C, & D) with one RHR heat exchanger.from each' unit on each header. There are two RHRSW pumps on each header; one normally assigned to each header (A2, B2, C2, or D2) and one on alte.rnate assignment (Al, Bl. C1, or D1). One RHR heat exchanger header can adequately deliver the flow supplied by both RHRSW pumps to any two of the three RRRSW heat exchangers on' the header. One RHRSW pump can supply the full flow. requirement of one RHR heat exchanger. Two RHR heat exchangers can more than adequately handle the cooling requirements of one unit in any abnormal or postaccident situation. The RHR Service Water Systems was-designed as a shared system for three u... c s. The specification, as written, is conservative when consideration . i.s given to particular pumps being out of service and to possible valving arrangements. If. unusual operating conditions arise such that more pumps are out of ~ service than allowed by this specification, a special case request may be made to the NRC to allow continued operation if the actual system cooling requirements can'be assured. Should one of the two RHRSU pumps nonna11y cr alternately assigned to the RHR heat exchanger header supplying the standby coolant supply connection become ~ inoperable, an equal capability for long-term fluid makeup to the unit reactor and ' for cooling of the unit containment remains operable. Because of the availability of an equal makeup and cooling capability which is demonstrated to be operable immediately and with'specified subsequent surveillance, n 30-day . repai r period is justified. Should the. capability to provide standby coolant supply be lost, a 10-day repair time is justified based on the low probability for ever needing the standby coolant supply. 164

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,o O t.tMITINC s dNDITIONS FOR OPERATION StPtVEII. LANCE REQUIRDThTS 3 3.5.C RHR Service Water and Emergenev 4.5.C RNR Service Water and E errency- _ Equipment Cooling Water Systems Eoutreent Cooline Water Systems '(EECWS) (Continued 1 (EECVS) (Continued) 2. During power operation, 2. a. If no more than evo U RSW pu.ps must be MRSV pu=ps are inep-operable and assigned etable. increased to service as indicated surveillance is not ~ below for the specified required. tice limits. b. Wen three MRSV pu=ps are inoperable, the remaining pumps, asso-ciated essential cen-f.!MIT SERVICE ASSIGNMENT trol valves, and asso-(DAYS) MRSV EIW *

  • ciated diesel genera-I'#***

Indefinite 7* 3* veekly. 30 7* or 6*** 2* or 3*** c. When f4ur RHRSW pumps are inoperable. :he 7 6* 2* remaining pumps, asso-ciated essential con-trol valves, and asso-

  • At least one operable pu:sp must be ciated diesel genera-assigned to each header.

tors shall be operated

  • .nnly automatically starting pumpa may be assigned to EECV header service.
  • '*Nine pumps must be operable.Either configuration is acceptable 7 and 2 or' 6 and 3.

3. Routine surveillance for these pumps is specified i's 4.5.C.l. DT1m D) El v ,DJ _a. .3. During unit 2 power oper. u ation any two RPRSW pu=ps -{ U (D1, D2, D1, and B2) nor- -b mally or alternately as-- sicned to the PJiR heat ex-changer header ' supplying .the standby coolant supply- . connection must be operabic except as soecified.in-3.5,C.4 and 3.5.C.5 below. 152 I i

c-a 1.1MITI'IC CONDITIONS 70R OPERATION SURVEILLANCE PICUIRDENTS 3.5.C (Continued) 4.5.C (continued) 4 When it is deterwined that ne of the RHn5V pueps s p-4. Three at the os, 02, al. 82 E I "" * *" # R!!RSW puDPs assi ned to tooperable at a time when S the RliR. heat exchanger operability is required, the supplyirig the standby operable RHRSW pump on the coolant supply connection same header and its asso-ciated diesel generator and may'be inoperable for a the RHR heat exchanger - period not to exceed h**d*' **d *** *i***d ****"~ 30 days provided the tiel centrol valves shall operable pump is be demonstrated to be aligned to supply the operable in=nediately and RilR heat exchanger every 15 days thereafter. header and the associated diesel generator and essential control valves are operable. 5. The standby coolant supply capability may be inoperable for a period not to exceed ten j days. 0 6. If specifications 3.5.C.2 through vV ~ 3.5.C.5 are not met, D ;- .an orderly shutdown shall be initiated ~3 and the unit placed in the cold shutdown condition within 24 hours. 7. There shall be at least 2 RilRSW pumps, associated with the selected.RilR pumps, aligneo for RiiR heat exchanger service for each reactor vessel containing irrad"ated fuel. 153

~. 3.5 BASES L Should the capability for providing flow through the cross-connect lines be lost, a ten day repair time is allowed before shutdown is required. 1his repair. time is justified based on the very small probability for ever needing RHR pumps and heat exchangern to supply an adjacent unit. REFEREi:CES 1. Residual Heat Removal System'(BFI!? FSAR subsecticn h.8) ?. Core Standby Cooling Syr.temr. (BFflP FSAR Section 6) 3.$.C RHH Service Unter System and haervent _' Equinment Coo t i ty* 5'ater "ynten ( EIM'.:") There are two EECW headers (north d south) with four. automatic starting RHRSW pumps on each header. All.7 :ponents requiring emergency cooling water.are fed from both headers tb, assuring continuity _of operation if either header is operable. Each '.eader alone can handle the flows to all components. Two RHRSW pumps can supply the full flow requirements of all essential EECW loads for any abnormal or postaccident situation. There are four RHR heat exchanger headers (A, B, C, 6 D) with one RHR heat exchangcr from each unit on each header. There are two RHRSW pumps on each header; one normally assigned to each header (A2, B2, C2, or D2) and one on alternate assignment (Al, B1, C1, or D1). One RHR heat exchanger header can adequately deliver the flow supplied by both RHRSW pumps to any two of the three RHRSW heat exchangers on the header. One RHRSW pump can supply the . full' flow requirement of one RHR heat exchanger. Two RHR heat exchangers can moreithan adequately handle the cooling requirements of one unit in any abnormal or postaccident situation. I The RHR Service Water Systems was designed as a shared system for three units. The specification, as written, is conservative when consideration is.given to particular pumps being out of service and to possible valving arrangements.. If unusual operating conditions arise such that more pumps are out of service than allowed by this specification, a special case request may be made to the NRC.to allow continued operation if the actual system cooling requirements can be assured. Ehould one' of the two RHRSW pumps normally cr alternately assigned to the HHR hest exchanger header supplying the standby coolant supply connection become inoperable, an equal capability for long-term fluid makeup to the unit reactor and for ' cooling of _ the unit containment remcins operable. Because of the . availability of an equal makeup and cooling capability which is demonstrated-to be-operable immediately and with specified subsequent'surve!'1ance, a 30-day 4 repa! r period is justified. Unit _2 nay be supplied standby!:colant from either of -ronr pumps--B1, B2. D1,-or D2. : Should the capability to provf de standby coolantLsupply-be lost, a 10-day repair time is justified based on the low probability for ever needing the standby coolant supply. 164 Y

e 4-ENCLOSURE 2 JUSTIFICATION ~(TVA BFNP TS 150) By letter from L. !!. Mills to H. R.-Denton dated August 26,

980, (TVA BFNP TS 147) and supplemented by letter from J. L. Cross to H. R. Denton dated August 28, 1980, we requested changes to the technical specifications of Browns Ferry unit 3 Amendment 34 to license No. DPR-68 issued September 9,1980, transnitted by letter from T. A. Ippolito to H. G. Parris dated September 9, 1980, revised the specifications in response to our request. The revised specifications allow operation of Browns Ferry unit 3 with the standby coolant supply capability (supplied from unit 2) inoperable for a period not to exceed ten days. The changer to the units 1 and 2 technical specifications requested here (TS 150) will make them consistent with the unit 3 technical specifications as revised by TS 147. Because the specification revisions request.ed are essentially identical, the justification provided for TS 147 is applicable to this change (TS 150).

The justification for this requested change, extracted largely from TS 147, is ns follows: Standby coolant flow from an adjacent unit is thtough the RHR eross-connection line. Loss of RHR cross-connect.ior flow path (by line blockage, etc.) will result in a loss of str.ndby coolant flow capability. Since no credit for cross-connected RHR flow is taken in the Appendix K analycis in the FSAR and becau::c of the very lou probability of ever needing RHR pumps and heat exchangers to supply an adjacent unit, a ten-day repair time for RHR cross-connection flow' capability is justified and authorized by Techncial Specification 3.5.B.13 Similarly, no credit for standby cooling capability through the RHR cross-connection line is taken in the Appendix K analysis in the FSAR and there exists a very low probability of ever needing this redundant backup source of cooling water. Therefore, the proposed technical specification change to allow a ten-day repair time for standby coolant supply ic justified and the overall reduction in plant safety margin would be insignificant. __}}

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