ML20236N592

Forwards Task Interface Agreement (TIA-97-12) Evaluation of TS Required Monthly & Refueling Interval Testing of P-4 Interlock for Vogtle Units 1 & 2

ML20236N592
Person / Time
Site:	Vogtle
Issue date:	12/22/1997
From:	Berkow H NRC (Affiliation Not Assigned)
To:	Jerrica Johnson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20236J990	List: IA-98-155, Responds to 980513 Request from Duquesne Light Co to Provide Written Interpretation of Beaver Valley Power Station,Unit 1 & 2 TSs Requirements for Channel Calibration of Rtds & Thermocouples IR 05000482/1991021 ML20236J987 ML20236K746 ML20236K751 ML20236K780 ML20236K784 ML20236K803 ML20236K816 ML20236K840 ML20236K853 ML20236K883 ML20236K902 ML20236K916 ML20236K936 ML20236K963 ML20236L549 ML20236L558 ML20236L563 ML20236L580 ML20236L584 ML20236L590 ML20236L597 ML20236L653 ML20236L921 ML20236L955 ML20236L971 ML20236M014 ML20236M020 ML20236M034 ML20236M057 ML20236M117 ML20236M138 ML20236M148 ML20236M911 ML20236M924 ML20236M966 ML20236M983 ML20236M996 ML20236N007 ML20236N047 ML20236N052 ML20236N066 ML20236N221 ML20236N240 ML20236N257 ML20236N271 ML20236N288 ML20236N323 ML20236N333 ... further results
References
FOIA-98-155 TAC-M98528, TAC-M98529, NUDOCS 9807150188
Download: ML20236N592 (4)

Text

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g NUCLEAR RECULATORY ION 'l ~ # ~

3 woe-.mee o. - t, - % l December' 22, 1997 4 t, . v.a.

MEMORANDUM TO: adessBudohnsonoDkedoor 88NWE' l PROM: Hertiert N. Dettour, Director ,  !

Project DrectorateIb2 / "

DMeion of RoederPrefects WI 05cs of NucteerReacter Reg (deti 'I I SUSJECT: TASK INTERFACE AGREEMENT (TW g7-12) EVALUATION OF

• TECHNICAL SPECIFICATION REQUIRED MONTHLY AND l REFUELING INTERVAL TESTING OF P4 INTERLOCK FOR  !

VOGTLE UNf731 AND 2 (TAC NOS. M98528 AND MOS$29) l Your memorandum dated May 5,1997, identilles a potental concem with the mothed used try l the Econoes to test the P4 interlock at Voglie Unge 1 and 2. Specmoelly, e portion of this interiock associated with the reactor trip bypees brestore le not being tested. The Vogue reaktert inspector provided edeilonelirdermeson regensne the P 4 insertook tesens precedure.

The etsff docussed this ' rWormation, contained in circuit disgrams of the loansee's test l preesdures, in e Naomber 18,1937, telesen ettended by the kanees the resident inspector, l end the project manager. Our sonalusione regarding the Bosness's P4 interlock assens are se tetews:

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' 1. Vogtie Technical Spec #ication (TS) Survolliance Requirement (SR) 3.3.1.4 requirse

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monthly operstdllty verEcotion of reestor trip trasher (RTS) and bypese brusher suidhery l end coR switch cardede, used me P4 interlock, to provkle inibeton elgnel to Solid State Protection System (SSPS) and Electro HydrouEc Control (EHC) system. The licensee's mornhir toot, however, vermee operstmy of onty half er es toisi numter of conteste used h P4 Interlock M violanon of the TB.

1

2. voede Technice! Spaceconon SR 3.3.2.s regures an 1s month TADOT (interlook siens!  ;

vereceten) of the P4 interlock for both the SSPS and the EHC syrtems. The llenness's )

test, however, vertflee the P4 signol to SSP 8 only. The pient design hee,an instated test '

airadt to test the P4 signet for only the SSPS. The P4 'aignet to the EHC"fyotem is not 4 bein0 tested, which is e violation of the M.

g 1hs atteshed evolustion completos sur effort in response to your TM. t$

3 Dochet Nee. 50424 and 50425 @

Ansehment: Tm 87-12 Evoluellon FAX TR A,NSMITTAL_ eve ==e L. i  ;

oc evett: C. Hohl, RI

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'; $ " E 'T3 rI wry' %-p590 Emmen mma e

9807150188 980624 f.?

PDR FOIA y UNNERST98-155 PDR

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,. TASK INTERFACF AQREEMENT fTIA.e712) EVALUATION l

BY THE OFFICE OF NUCLEAR REACTOR REGIAATION.

VDQTLE UNITS 3 AND1 DOCKET NOS. 80424 AND 80425

'1.0 INTRODUqT]ON By memorendum dated May 5,1997 Region 11 requested NRR's technleet sealstence to evolusts the Vogtis resident inspector's conesmo regenang monthly toedng of the Vogtle Reedor Trip System (RTS) bypsee circuit tonalere and lie N inlertook. The memorendum specsficeny requested the sesfr to address the fWowmo two conmems:

1, to the licensee's process or ordy emoting the sum shunt trip foeture or the reecaer trip trypese broeiere prior to piecing them in servios, noneistent wth the Trip Assuotion Devios operational Test (TADoi) requirement of the plant Technhwl Spanuicaticm l (TS) Surveillance Requirement (BR) 3.3.1.47

2. le the lleensee% praction of not toedng the P4 signal generated by the trypese tweaker and supplied to the turtine Electrp+fydraulic Contml (EHC) system canalstent wth the TADOT requirement of TS BR 3.3.2.97 2.0 EVALVATION The etsff evolunden of the Voglie boensee's practice of testing the bypers broders and lie N interiocks won based on the design foetures of the roedor trip broeiere (NT9e), reactor trip bypees treekere end their P 4 interloche, and the plart TS requirements.

In addition, the Vogtle resident inspector provided additionslinformation regen $ne the P 4 i interlock testing procedure et the Vogtle Unite 1 and 2. The staff discuened this Information -

! contained in circuit disgreme af the iloonese's test precedures in e November 18,1987, teincon l l stended try the Boonees, the reeldent inspostor, and the proJoct manager.

1. RandarYng Svnsen armakerTest In Westinghouse plant designs, e trypese broeier le provided in perelief with each of the two RTBe, only to facibtste et power testing of the RTBe. Westin0 house Topical Report WCAP 7872, " Solid State (.egic Protection System Description,' indicated that when en RTS is bypossed for test, the sesociated 89 tid otsie pnytechon system (SSPS) train is eenesclerod inoperable.

The RTBe end the trypees brookere are provided with en undervoltage and a shunt trip testure. The SSPS providse e signal for automatic trip (deenergine) of the undervoltage coll. Nowever, operating the mein control board menuel switch almutteneously actuates the diverse foeture (undervoltage evid shunt trip) of the reactor trip tweelers. In addition as these features, the trypese breeter een slao be tripped try a local manuel swllch. i ATTACHMENT 9

2-This local shunt trip flecture le provided to facihtete at power verification d the bypees breeler trip espebBty, which is pleoed in oorvios only during the mentNy TADOT Wthe nosociated RTB.

The Vogtle plartt TS defines TADOT as operating the trip ectuating devios and vertfyin8 the operability of required eierm, interlock, and trip funcione. TADOT of en RTB is required on a 31. day staggered test basis and TADOT for the associated bypese trosher is required prior to placing it in servlos. The plant 78 also limite plent operation to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> when a trypses broeler le ancke64n for testing the assocuted RTB. The T5 Bones for

f. ;;r TADOT of the bypses brealer indkstos that the bypees tweekers are tested only fbr the shunt trip by operedng the local manuel switch boosues the design does not have the capability for esperate and independent verificabon of both shunt and undervotste trip functione et power. For the bypass treakere, an independent verification W the shunt and undervoltage trip functions opersbelty le performed on on iknonth survomenos test intervel TADOT during the scheduled shutdown of the power plant. As defined, TADOT requires operating the trip ectuohng devlas (RTB ond bypese tweaker) whhout specifying the means to trip thans treekere. Additionally, #m sesoaisted SSPS train le conaldered inoporelde during an RTB morthly test, whkh etwistes tusene the operability of the undervoltage trip func6en inibsted by en inoperable SSPS train.

The etsff review of the Vogue plant design foetures and TS surveillance respanemonte found the licensee's monthly TADOT of the reactor trip bypass tweelere to be se,sistent

' wkh T8 SR 3.3.1.4. However, the monthly operebfilty of RTB and trypese trooker susillery and cell switch contacte providing P 4 Interlock signal to SSPS and EHC systems are not fully verffied. The Boonese4 monthly test vertfies operabtitty of only half of the total numter of cornects used in P d ledertook in violation of the Ts.

2. T. ::,a P= Trio a.=- ;i. % P.d E:=f te TuO MC * ~ -

P 4 la en Engineered Safety Feature Actuston System (ESFAB) interlock onshied when  !

! en RTB and its associated trypees treeter is open. Normally closed contacts of the coR owltch (treaker rock-infoul position switch) and thet of the auxilary owltch (treaker open/ class owltch) provide the P 4 eignal to trip the mein turtrino end initiate other E8FAS functions. The Voglie design includes two separate P-4 irWtisting ciraute; one providing trip signal to the turbine ENC system anti the other providing a trip signal to the SSPS for l

initiating other ESFAS funceana. Each circuit le e parallel combination of one closed l contact of the RTB esti owitch and one closed contact of the R1D audiary owheh in series with a simEar contact combination of the sesociated bypees treekst. As such,the P4 signol le only generated when either the nell or the audiary switch contacts of both the RT5 and the sesociated trypees breaker are cloeod. It le. therefore, not poselbie to esperately test the P4 eignal contribution by the RTE and the associated bypese breakers.

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Vogue Technical Speemaeuen SR 3.3.3.8 requirse en 18 month TADOT (iresNock elgnol verMconon) of the N ireerteck for both the 88PS and the EHC systems. The lioenese's test, however, vermee the N signal to SSPS ordy The piant design has en insteBod test ,

circuit to toot the N elgriet for only the sSPs. The N signal to the EHC system le not i teing tootod,in vlotonen of the TB.  ;

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. 3.o C O N C W RIO N Sesed on as review of the irdbrmetion provided in the TIA and the Novemter it 1997, telecon  !

with the teensee, the stoR concludes met the Vogtle liaenese's testing of ordy the shunt trip  !

lesture of the reactor Mp typese tweakers le consistent with the TS requiremers of SR 3.3.1.4  !

• wh5e not verWying the status of et ooraeste h P4 interteck to inconsistent with me TS survomanes requirement. in addhion, the stoff has concluded met twt teoung #w N interlock signal se the EHC system is insensistent whh the TADOT requirement of TS BR 3.3.2.0.

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l Tomt. p.14

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