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{{#Wiki_filter:consumers Power l'llWERINli MICHlliAN-S l'llOlillESS . Palisades Nuclear Plant: | {{#Wiki_filter:consumers | ||
* 27780 Blue Star Memorial Covert. Ml 49043 | ~*:,. | ||
Power GB Slade General Manager l'llWERINli MICHlliAN-S l'llOlillESS | |||
. Palisades Nuclear Plant: | |||
* 27780 Blue Star Memorial Hi~hway, Covert. Ml 49043 | |||
* April 24 , 1992 | * April 24 , 1992 | ||
* Nuclear Regulatory Commission . Document Control Desk | * Nuclear Regulatory Commission . | ||
* Washington, DC 20555 DOCKET 50-i55 -.LICENSE DPR | Document Control Desk | ||
Event Report (LER) 91-014:03 is | * Washington, DC 20555 DOCKET 50-i55 - .LICENSE DPR PALISADES PLANT - | ||
* This event is _reportable to the. NRC per 10CFR50.73(a)(2)(ii), as a condition outside the design | LICENSEE EVENT REPORT 91-014-03, - SAFETY RELATED CIRCUITS ROUTED WITH OPPOSITE CHANNEL CIRCUITS - SUPPLEMENTAL REPORT . . | ||
LER 91.-014 was dated August 8, 1991, and provided notification. | License~ Event Report (LER) 91-014:03 is .attach~d. | ||
* that a separation and channelization existed with* cabling **associated with three electrical schemes. In that LER we rioted that of an ongoing Electrical Cable and Racew.ay Separatibn Issue Res.elution Plan, we exp.ected to. submit additional information on this subject, as we expected that additional deficiencies may be identified. | * This event is _reportable to the. NRC per 10CFR50.73(a)(2)(ii), as a condition outside the design | ||
Supplement 1 to LER 91.-014, .*dated February 14, l992, prov.ided information concerning additional. | ~ ' *- | ||
* their and planned resolution. | basis. | ||
Supplement 2 to LER 91-014 provided information on a and channelization | The original. LER 91.-014 was dated August 8, 1991, and provided notification. | ||
**deficiency identified with pressurizer level circuitry* | * that a physi~al separation and channelization d~ficiency existed with* cabling | ||
cable .. This attached *supplement provides.informatiorr on one additional cable separation and | **associated with three electrical schemes. In that LER we rioted that becaus~ | ||
of an ongoing Electrical Cable and Racew.ay Separatibn Issue Res.elution Plan, we exp.ected to. submit additional information on this subject, as we expected that additional deficiencies may be identified. Supplement 1 to LER 91.-014, | |||
-Palisades | .*dated February 14, l992, prov.ided information concerning additional. | ||
* Attachment 9205010259 920424 PDR ADOCK 05000255 S PDR NllCtso:r** | * deficienci~s, their stat~s~ and planned resolution. Supplement 2 to LER 91-014 provided information on a cabl~ s~paration and channelization | ||
.-ovE:') OMI NO. | **deficiency identified with pressurizer level circuitry* cable .. This attached | ||
'ACILITY NAME 111 IDOCICIT ....all 121 I r*g* llll Palisades Plant o.1s101010121s1s 1 OF OIS liTrntTr;L** | *supplement provides.informatiorr on one additional cable separation and * | ||
;.-,'!;:-* | ~hannelization.defiGiency associated with the plants redundant*~ngineered safeguards roo~ ~ir coolers. Because programs afe in place to address these* | ||
......... .. ".'". | deficiencies, and have been described in earlier revisions of this LER, no | ||
*major changes have beeh made to .the descriptions in this LER except for the addition of the latest.deficiency to the attachment to the LER. Any changes d 4 ; t ; c a f l i n e in the right.hand margin. | |||
.. AMU OOCKIT NUMalRlll N/A 01&1010101 I I oh | Gerald B Slade General Manager CC Administrator, Region III, USNRC NRC Resident Inspectdr - Palisades | ||
-*.-II-I 21Ull21111 | * Attachment 9205010259 920424 PDR ADOCK 05000255 S PDR | ||
- | |||
* ao.*c.1111111 LIVIL i...... 1101 or o | NllCtso:r** U.I. NUCLIAll lllGULATOllY Cm9t1DIC* | ||
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.-ovE:') OMI NO. J110~HM LICENSEE EVENT REPORT (LEA) | |||
.. 1 | 'ACILITY NAME 111 IDOCICIT ....all 121 I r*g* llll Palisades Plant o.1s101010121s1s 1 OF OIS | ||
...._ OTHlll /$/#e/f'>; | .*.--~ liTrntTr;L**;.-,'!;:-*.........--...~-~-~-~-~..".'".~~----;--...,---;....._--------...,-----...,--......J'-.::.....L:...L..:~;...J..:..J..:...JL.::_~_.1::_~..:...i.::..:..w~~ | ||
;,, Ab<OWr 1#1-.11111 | SAFETY RELATED CIRCUITS ROUTED WITH OPPOSITE CHANNEL CIRCUITS - SUPPLEMENTAL REPORT | ||
/ff Text, NRC ,,.,.,,, .U,). | . Liii NUMeElll.Cll llll'OllT DATE 171 . OTHlll 'ACILITIU llrVOLVIO Ill' | ||
!REPORTABLE::::::::::::::::::-:::::::::::::::::.::::::: | *YEAR f{ISl~~~:~~AL f:;}: : . : MONTH DAY *YEAR ~AClLITY .. AMU OOCKIT NUMalRlll N/A 01&1010101 I I oh 19 9 1 9l 1 - I 0 11 14 | ||
CAUSE SYSTEM TO NPRDS :::::::: :::::: : | - ol3 0 14 214 91 2 N/A 01S1010101 I I ITTEO l'UllSUANT TO THI lllQUllllMINTI O' 10 Cfll §: /etr.d - or,,,_ of 1M fol-..,J 1111 | ||
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*:*:*:-:*:*:>:* | Ol'lllATllllG 1--llOO-* -*.-II-I-~~--< 21Ull21111 | ||
:;:::::: ::::::::: | -- 20.<IOlllol I0.71lo!llJlll*I .__ 1u1i.1 | ||
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:=:=:*:*:-:;;. | * ao.*c.1111111 IO.JllolCll ID.714111JIM 71.71111 | ||
:::: :::::-::::::::-,: | ---- | ||
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:::: I ) > | 1101 or o 1o ao.*c.11111w1 I0.*101121 . I0.711811211 .. 1 ...._ OTHlll /$/#e/f'>; ;,, Ab<OWr 1#1-.11111 /ff Text, NRC ,,.,.,,, | ||
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I0.71lo!llJllUI ID.71C.llillw1111191 . | |||
LX. I0.7JC.llJIUUI 111.n1a11211.1 LICINIH CONTACT fOll THll Liii 1121 T LEPHONE NUMBER ARIA CODI Will~am L. Roberts, Staff Licen~ing Engineer | |||
~LITI ONI .LINE fOR IACH COMPONENT fAILUlll OllClllllO IN THll. lllJIOflT 1111 CAUH SYSTEM COMl'ONENT* !REPORTABLE::::::::::::::::::-:::::::::::::::::.::::::: CAUSE SYSTEM COMl'ONENT TO NPRDS :::::::: :::::: : | |||
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:::::-::::::::: | """LIMINTAL RIPORT EXPECTED 11" y. YI IX'ICTl!D | ||
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:;;;;:;:;;;:;::*:*; | n IUIMISllON OATE 11111 YU (If llW. * - llJ<'IC'TED SVIMISSION. DA TEJ I I | ||
:;.;;:;:: | 1\81TflACT /Limit ,. l<<IO - | ||
:;:: """LIMINTAL RIPORT EXPECTED 11" . . n YU (If llW. *-llJ<'IC'TED SVIMISSION. | * I.a.. -x;;,,,,.,y fl,_ li'WI*-* ry_rre,, /in.V 1111 . | ||
DA TEJ | Through the on-going Palisades Configuration-Control Project a number of apparent discrepancies in circuit routing have been identified. Previ~us NRC correspondence dated September 4, 1990 and March 12,-19_91 provided details of the "Ci~cuit ~nd Raceway Schedule Enhancement Proje~t" and status of the projects .activities. The electrical .circuit channelization and separation deficiencies which have been evaluated at this time, while not conforming to FSAR criteria in all res_pects, have resulted in identification of very few conditi.ons involving a loss of ~lectrical ~r protection system independence; or noncompliance with lOCFRSO, Appendix R requirements". In those few cases compensatory measures and corrective actions have been taken as stipulated in plant Technical Specifications and/or the condition was promptly-correct~d~ | ||
/Limit ,. l<<IO -* I.a .. -x;;,,,,.,y fl,_ li'WI*-* ry_rre,, /in.V 1111 . Through the on-going Palisades Configuration-Control Project a number of apparent discrepancies in circuit routing have been identified. | The physical separation and channeli~ation deficierici~s that have been identified appear to result from two separate failures: 1) A non-uniform interpretation of design criteria for chann~lizing and routing electrical circuits, and 2) the unavailability of a single, complete .and reliable source of desfgn document*tion for electrical circuit routing and channelization. | ||
NRC correspondence dated September 4, 1990 and March 12,-19_91 provided details of the Raceway Schedule Enhancement and status of the projects .activities. | At the time of the discovery of the latest discrepancy (engineered safeguards room cooler cfrcuitry channelization}, the plant was shutdown for a refueling outage.. | ||
The electrical .circuit channelization and separation deficiencies which have been evaluated at this time, while not conforming to FSAR criteria in all res_pects, have resulted in identification of very few conditi.ons involving a loss of protection system independence; or noncompliance with lOCFRSO, Appendix R requirements". | * NflCF-- | ||
In those few cases compensatory measures and corrective actions have been taken as stipulated in plant Technical Specifications and/or the condition was The physical separation and that have been identified appear to result from two separate failures | IM31 | ||
: 1) A non-uniform interpretation of design criteria for and routing electrical circuits, and 2) the unavailability of a single, complete .and reliable source of desfgn document*tion for electrical circuit routing and channelization. | |||
,*-**** ., **-* | |||
* IM31 | llllC *** - - | ||
*NJ* "I *wC~iA* *1;.;,,.r:)** ==-***Oil | |||
*1;.;,,.r:)** | - .-01110 ~wt *O l'to-4*1).e . - | ||
==-***Oil | IO**o **~*,. - | ||
-.-01110 *O l'to-4*1).e . -IO**o | |||
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.. | .. | ||
* | * OOCUT- llUl91* Ill | ||
.< . | ~** *~* ** *&QI | ||
* | * 11 | ||
.- | * Palisades Plant Op 14 - - oI 3 o 12 oir. o 1s* | ||
..... ., ... ., .. .. OOCUT .... 1*111 ' | "",............ -------All"'.,.."''" - | ||
EV~NtDESCRIPTION T_he *Palisades Configuration Control Project (CCP) which was initiat~d in 1987 | |||
Plant o s o o o . 2 *s s. 9 | 'included an effort to.veri.fy and correct plant electrical drawings, including the plant circuit and raceway schedule. - This effort involved development of a circuit and raceway schedule data.base, as well as-verification of selected portions.of circuit routings. Through this effort a number of apparent discrepancies in circuit routing have been identified. - This event involves_ | ||
* i 0 1 4.* .... 0. 3 4 011 0 5 1 : | approximately *40 circuits wh.ich were bel ie-ved. to be safety-related. cj rcuits routed with opposite channel circuits. Previous plant deviation reports | ||
* This _event is being reported under lOCFRSO. 73(a) (2)(1i) as a condition. | *involving apparently mls'-routed Circuits include D.-PAL-8~-147, D-PAL-90-40, D-PAL-90-221, and D-PAL-90-222. All of the apparently mis-routed circuits* | ||
from these earlier deviation reports that have been evaluated,. have been dispositi.oned as either notb"eing safety-related and therefore channelized circuit rout~ng .is not an issue, or the cirtuit mis-routing .is nrit a ~afety | |||
actions ng .ci rc.uit channel i | ' concern because the failu~e of the cfrc~it does not lead to: undesirable consequences (i.e. the circuit fails safe). Additional backgrbund and* | ||
began with _the Electrical Cable and Raceway Separation Issue . * | information on the CCP circuit.and raceway_ enhancement *project was p~ovided to the NRC in our letter dated Septembe~ 4, 1990. * ~ st~t~s update on the proje~t c was provided. i,n -our letter dated March 12, 1991. | ||
. | |||
At- the time of th*e disc<?very -~of the 'latest discrepancy *(engineered safeg-uards | |||
*roc;>m *cooler.s circuitry Channelization), the plant was shutdown for a refueling | |||
-outage.* This event 'is :reportable as _a condition *outsid~ the des-ig!l _oasis of I | |||
- . the pl ant. * * . | |||
*- -* | |||
. Cause of the Event* | |||
~he physical separation and-channelization deficiencies that have been _ | |||
id~ntified appear t~ result from two separate: failures: 1) A: non-uniform interpret~tion of design criteria for channelizing and routing el~ctrical circuits, and 2) the una~ailability of a single, complete and reliable source** | |||
of design docum~ntation for electrical circuit r9Uting and channelization. | |||
Analy~is of the Event .*.. .. | |||
Cable. Separation_ Design Criteria The desig_n criteria wfrich were or-ig.inally used at Palisades to provide - - | |||
physical independence between redundant electrical tircuits were submitted to the Atomi.c Energy Commission (AEC) on May 28, 1969. This submittal contained, in part, our response to a requ~st for information regarding the criteria and_ | |||
associated bases used at Palisades during initial design and installation of* | |||
- el~ctrical circuits. The ~uidelines that are currently used during design of electrical cables and rateways are essentially unchanged from those of the "original design period and are r~flected in FSAR Section 8.5.3.1. FSAR Section 8.5.3.1 states that circuits belonging to safety-related power distribution channels, reactor prote~tion system channels, engineered safeguards channels or other _safety-related syste!:ll channels will be run in | |||
llltC . . . . . | |||
1~1 . . '"~- *'-C~Ua .*I~"'''"'.~** ::..01*.1<> | |||
. . UCINSll . , . AIPOffT ILIA> TIXT CONTINUA. "° | |||
_OOC&IT ""'91* Ill ., | |||
............ ...... '"''" | |||
.*-Ov10 ~ ... | |||
; | |||
l'to-4*00 * | |||
. | |||
..... ... | |||
~ | |||
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*&OI *>> | |||
Palisades Plant 911 - o 11 I 4 - 013 01 3 011 0 15 *. | |||
separat~ raceway sy~tems; and that "physical separation; (dist~nce), is considered to ~e most reliable method of providing circuit separation and | |||
* isolatton." ** * * | |||
*In practice, the.design criteria fbiphysical separation and independence of. | |||
electrical circuits are primarily satisfied by* routing electrical cables in chanryelized cable raceways, and by maintaining a separation distance between. | |||
these*channeliz~d raceways .. Thts method of providing physical separatio~ | |||
between redundant e_lectrical circuits meets the intent of currently accepted standards and guidelines and has been reviewed and determined tobe | |||
.acceptable. Palisades was designed pri.or to issuance of Regulatory Guide | |||
.* I. 75., "Physical Independence of Electrical Systems," the AEC General Design | |||
* *. Criteria for physical independence of electrical circuits, or.the*asspciated IEEE standards (IEEE 279' IEEE 384) . . ' . | |||
Circuit Separatjon and Channel izatipn Anomalies *> | |||
We have identified several examples where the cha*nnelization of installed . | |||
electrical cables does .not satisfy our original design criteria .. The actual | |||
. *number of electrical cable_ separation and channelizat1on discre,pancies_ | |||
. identified so far represents only,_a very small percentage (less. than orie percent) *of the over thirteen thous~nd* electrical cables that we have evaluated~ As a res.ult of these cable routing anomalies, we 'f1ave unde.rtaken a* | |||
* progral!'lmatic effort to identify and resolve those physfr:a1 separation and .. | |||
channelization discrepancies that may exist, and we have.taken steps to | |||
* prevent prcimulgation of iimilar di~crepancies in1he future~ We have also** | |||
taken actions to address the physical separation. *and *channelization * . * | |||
*deficiendes-whicb h.ave been.identified to date. * .. | |||
The electrical circuit chanri~liiation and separat*i*o*n deficiencies which *have been ~valuated at this time, while not cdnforming t6.FSAR criteria in all respects, have resu.lted in identification of very few safety-significant | |||
*conditions involving a loss of electric;al or protection _system independence or | |||
*.noncompliance with. IOCFRSO, Appendix R requirements. *In those few cases. . .. | |||
comp_ensatory measures and corrective actions h'ave been taken as stipulated .in plant*Technical Spec'ifications and/or the condition was promptly c,orrected.. | |||
* . Palisades has taken an aggressive pos.ition i.n its response to the identified eleetrical cable routing and channelization discrepancies *through the Electrical .Cable and Raceway Separation* Issue Resolution Plan . . This plan* | |||
:addresses the causal factors for these conditions and proposes actions to prevent reoccurrence. The key provisions of this pl an include: | |||
* I') | |||
publication of clear procedural ,guidance relative to cable routing design . | |||
. criteria, 2} availability of reliable circuit design- information, 3) field | |||
*review of installed raceways, and -4) evaluation and resolution of identified cable routing*and ~hannelization discrepancies. As we have done in the past, we wiJl evaluate confirmed cable routing and separati~n discrepancies for safety-significance and *operability impact when they ~re identified, and* | |||
. compensatory and corrective measures will be. pursued, as necessary .. | |||
* 11llC ***ma , | |||
*~** "1 *we~~** *IQ ... ~ .. *:i** :~***ooo | |||
......,....,. .. | |||
. | |||
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OOCUT . . . .1*111 ' | |||
..... ~**~***. *&QI >> | |||
. ~alisades Plant o s o o o .2 *s s. 9*i 0 1 4.* .... 0. 3 4 011 0 5 1 : | |||
* This _event is being reported under lOCFRSO. 73(a) (2)(1i) as a condition. outside | |||
~the des1gn: basis of.the plant .. :* | |||
Corrective Action* .. | |||
*.. _Corrective. actions a~dressi ng .ci rc.uit channel i ti' -and separation . ta on . | |||
defi-ciencie~ began with _the Electrical Cable and Raceway Separation Issue . | |||
* | |||
* Resolution Plani *A suimriary anq implementat:ion schedule for these ac;tions was provfded fo our September 4, 1990, "Submittal of. Add,.itfonal informati_on | * Resolution Plani *A suimriary anq implementat:ion schedule for these ac;tions was provfded fo our September 4, 1990, "Submittal of. Add,.itfonal informati_on | ||
* Related to the-Cir*cuit and Raceway Schedule Enhancement Project," and .a status update was* provide4 in our-March 12, 1991-The_actions and their .. FUrrent status are listed below: * * | * Related to the-Cir*cuit and Raceway Schedule Enhancement Project," and .a status update was* provide4 in our-March 12, 1991- lett~r. The_actions and their | ||
of elect.rical circuits has been reconstituted | .. FUrrent status are listed below: * * | ||
_and * .. . . | *"***.*, | ||
the "Electrical Desig*n * **,. | ** .. L * .The* des-i gn *'and n ~ens i ng :basis.: for thannel i zat.i on .and phys i ca i. | ||
.. ". _* ... * ., . . .. * . . * .'. * . | * *. : separation* of elect.rical circuits has been reconstituted _and * . . . . | ||
been deve lOped Jn Admi ni strati * | *consolidated ,in a single.:dotument,_ the "Electrical S~paration. Desig*n * .. | ||
,'9 | **,. C~iteria*~and Licens_i~g ~asis .. ". _* ... * ., . ... * . . * | ||
** . ** * .:** . | .< . *.. * .'. ~. * . G~*i d~-~c~ *h~s~ been deve lOped Jn Admi ni strati v~ | ||
and Raceway for contfol *and entry of _design* | * Proc~dure ,'9 ~3~, ** . ** * .:** **'. | ||
. . :;, -"Circu.it'. and Raceway Schedule!',~*. for contfol *and entry of _design* . ~ *~ *.::: . . _. -* ... | |||
.. . *. | informat*ion-. in the)~a.~le_,*-~nd: Raceway Schedul_e (c~*sr datab~se . . | ||
**peen **_incorpo.rated- | . :i.*,. *. . * * .** . , *,:* .* | ||
*i ntri * .. *. | o' C~ble ~outing.* requ.i ~'~merits and: .practi ~.ei ha~e **peen **_incorpo.rated- *i ntri * .. *. | ||
''Ch'anne_l C'able;* * *': | Engilie~ring.-Guidelines: EM-22-.04~-- ''Ch'anne_l .Sepa*r~.tion ~- C'able;* * *': | ||
* Routing* Instr_uctions;'" . .EM-:22-03, *"Fire Protection- | * Routing* Instr_uctions;'" ..EM-:22-03, *"Fire Protection- - Cable *Route .... . ~ | ||
-Cable *Route .... *** Verification;'" EM-22-06; Routing -EEQ | *** Verification;'" EM-22-06; ."~able Routing - EEQ Requirements;'~ ****: *. | ||
****: *. EGAD-PROJ.--:08, "Cable Sizing* Gujd.eline and EGAD' .. PROJ*-03; | EGAD-PROJ.--:08, "Cable Sizing* Gujd.eline >Amp~city;-" and EGAD'.. PROJ*-03; * **' *' * | ||
* **' *' * | "Electrical Engine_erjng *sep,arat:ion Criter_ia; Prac.tiC:es and*_, ,. - . . ,:. | ||
*sep,arat:ion Criter_ia; Prac.tiC:es and*_, ,. -. . ,:. Except.ions;''' | Except.ions;''' * . *. * ., * * * .. :: .* .. ; | ||
* . *. * . , * * * .. :: .* | * | ||
fo order to identify i.nstallati9i:is do not -meet. desig.n * . >req_ufreinents;_;. | . .' 1**."* . ** : ' *, . ' | ||
* .. .-*.*.:._ | 4~ A p_hysical:;rev1ew of *installed cable: raceways h_as been performed. fo order to identify i.nstallati9i:is *th~t do not -meet. desig.n * . | ||
*,** * * .,*'.* | >req_ufreinents;_;. * ...-*.*.:._ *,** * * .,*'.* | ||
* Design relative to the | *;~ | ||
*and phy,sical | ,_-. | ||
* roµting of electrical circuits and will be erihanced._ | * 5;.*:~ Design tnforma~ion relative to the cha:~neli:£ation *and phy,sical | ||
* .. . contained. | * roµting of electrical circuits and ra~eways will be erihanced._ Thts*- | ||
in the .CRS database *and is currently expected to be *. * | attiori will tnclude validation ~nd.tcimpletion ~f informat.ion * .;:" .. | ||
* comp_l ete *prior to 30, 1992. * " .. : . | . . contained. in the .CRS database *and is currently expected to be | ||
anonial ies fdentified . . during our review of physical *raceway installations .will .be . evaluated and appropriate_ly dispositioned.. | *. * | ||
The sc_hedule* | * comp_l ete *prior to ~eptember 30, 1992. * "..: | ||
for* ,. re solution of these i terns *iS. dependent on the number and' type of* . . items identified during the . . . ** *, | . . . | ||
llllC *** *MJ* i..JCENSEE -NT -AIPOffr ILIA) TIXT CONTINUA-N | .6. * -Electrical cabie*:sepa-ration and channelization* anonial ies fdentified . | ||
* . | . during our review of physical *raceway installations .will .be | ||
. evaluated and appropriate_ly dispositioned.. The sc_hedule* for* ,. | |||
-0 .. 10 ... "° | re solution of these i terns *iS. dependent on the number and' type of* . | ||
........ | . items identified during the revi~w. | ||
1'1IT ,._ ........... | .. ** . | ||
-........ -.......... | * ... , | ||
.,.,i71 .--For the specific circuits in this LER, the Control Project (CCP) Electrical Cable and Raceway Separation Issue Resolution Plan is intended to address the root cause of this event and no further corrective actions to | |||
* prevent. recurrence are proposed at this time. Remedhl actions for the recently identified specific circuit routings are as follows: ,* A.* Since only class IE circuits require physical separation of . . channelized circuits, the safety classification of each potentially mis-routed circuit will be | llllC *** - - | ||
* B. -The in-.plant routing of .each potentially' mis-routed safety-related channeli.zed circuit wilr verified. | *MJ* .IJ a iiwc~&****1c1.i1o.*'~** .::a.t***Qlil i..JCENSEE -NT -AIPOffr ILIA) TIXT CONTINUA-N * . - 0 .. 10 ~ ... "° l'to..,)*~ | ||
..... ............ | |||
........ l*'l*" | |||
QOCUT llUMll* Ill * *~ | |||
. *&QI JI | |||
*Palisades Plant 25591 05000 0 1. 4 - .0 3 5 011 0 5 | |||
" _..;;;..:. 1'1IT , . _ ...........-........ -. ..........,.,i71 .-- | |||
For the specific circuits in this LER, the Configu~ation Control Project (CCP) | |||
Electrical Cable and Raceway Separation Issue Resolution Plan is intended to address the root cause of this event and no further corrective actions to | |||
* prevent. recurrence are proposed at this time. Remedhl actions for the recently identified specific circuit routings are as follows: | |||
,* | |||
A.* Since only class IE circuits require physical separation of . . | |||
channelized circuits, the safety classification of each potentially mis-routed circuit will be ~e~iewed. | |||
* B. -The in-.plant routing of .each potentially' mis-routed safety-related channeli.zed circuit wilr b~ verified. | |||
* C. | * C. | ||
* A further investigation of original plant design basis for. physical separation of safety-related was completed. | * A further investigation of t~e original plant design basis for. | ||
on the results of this review, the EGAD-PROJ-03, "Electrfcal Separation Criteria, Practices, and was revised. * * * | physical separation of safety-related ~trcuits was completed. Bas~d.* | ||
* D. Each confirmed circuit channelization def1ciency | on the results of this review, the EGAD-PROJ-03, "Electrfcal Engin~ering Separation Criteria, Practices, and exception~," was revised. * * * | ||
*will be evaluated with regards to *equipment | * D. Each confirmed circuit channelization def1ciency *will be evaluated with regards to *equipment _opera bi 1ity and 10Cl'R50. 59; 'Appropriate ** | ||
_opera bi | compensatory measures and corrective actions as stipulated in.plant . | ||
59; 'Appropriate | . . Technical Specifications will also be taken .. A list .of confirmed . | ||
* | *. circuit channelization deficiencies is p~ovided in. the attachment to | ||
.*this LER. . . . . | |||
* * .. If 1t i's determined that' failure of the _improperly channelized, safety-related circuit does not affect of.a *. safety function, the circuit may be left as currently routed. Such* conditions will be clearly documented in the* Circuit and raceway | E. Physical separation of improperly channelized, safety"'.related circ~its will be established on a sched~le.consistent.wtth the | ||
* * * * * | . safety significance of the deviation. * * | ||
* F. Confidence in the accuracy *of the.circuit routing data in.the Circuit and Raceway Schedule was evaluated,. | .. If 1t i's determined that' failure of the _improperly channelized, safety-related circuit does not ad~ersely affect ac~omplishment of.a | ||
and it was determined that additional verification inspettions are not needed to assure that circuit channelization deficiencies have been identified. | *. safety function, the circuit may be left as currently routed. Such* | ||
Previous submittals of this lER, dated August 8; 1991, February 14, 1992 and March 10, 1992 have identified information on other.cable separation discrepancies. | conditions will be clearly documented in the* Circuit and raceway sc~edule~ * * * * * | ||
* F. Confidence in the accuracy *of the.circuit routing data in.the Circuit and Raceway Schedule was evaluated,. and it was determined ,. | |||
Attachment | that additional verification inspettions are not needed to assure *, | ||
* Co11111elit of .. Safety Circuits Question 8293 Room 2 . No No When: the erinditicin was discovered | that circuit channelization deficiencies have been identified. | ||
Addition~l fnfo~mation Previous submittals of this lER, dated August 8; 1991, February 14, 1992 and March 10, 1992 have identified information on other.cable separation discrepancies. | |||
.. S65 1 *. Yes No Failure of circuit not System adversely affect accomplishment.of the safety function. | Attachment | ||
IP 73 | 'I' ... *. | ||
* Narrow ... | LER 91-014 S~pplement 2 CONFIRMED CIRCUIT CHANNELIZATION AND SEPARATION DEFICIENCIES Scheme Scheme Name NUinber *Operable " Unreviewed | ||
* Co11111elit of .. Safety Circuits Question 8293 Die~el Gener~tor Room 2 . No No When: the erinditicin was discovered a. | |||
* Proper. physical separation will be .. *established . sos Service System 1 . Yes . No Failure of this c i r*cu it does not Valves adversely affect accomplishment of .. the safety function . " G06R Diesel 1-2 Auxiliary 1 *No. No of this circuit does not Skid adversely accomplishment-of " the safety function in short term. (2-4.hours). | Cooling Fan V24C . | ||
Long term operator .actions are addressed in *plant . . | *temporary modification was performed to remove reliance on V24C;' This . | ||
Proper physical . separation will be established . .. Sl6 Crimponent Cooling J . Yes No Failure of this circuit does not Water Valves* adversely affect accomplishment | ' | ||
*of the safety | - | ||
* furict ion .. | circuit has been re-routed to provide proper physical separation. | ||
.. | |||
S65 Reactor Prcitection 1 *. Yes No Failure of circuit d6e~ not System adversely affect accomplishment.of the safety function. | |||
... .1 IP 73 | |||
* P~essurizer Narrow ., | |||
No . . Yes When the condition was discovered a Range Pressure . .. temporary modi fi.cati on was performed to discorinect the circuit. | |||
* Proper. | |||
physical separation will be | |||
.. *established . | |||
sos Service W~ter System 1 . Yes . No Failure of this c i r*cu it does not Valves adversely affect accomplishment of | |||
.. the safety function . | |||
" | |||
G06R Diesel 1-2 Auxiliary 1 *No. No Fail~re of this circuit does not Skid adversely aff~ct accomplishment-of | |||
" | |||
the safety function in short term. | |||
(2-4.hours). Long term operator | |||
.actions are addressed in *plant | |||
. . | |||
proced~re~. Proper physical . | |||
" separation will be established . | |||
.. | |||
Sl6 Crimponent Cooling J . Yes No Failure of this circuit does not Water Valves* adversely affect accomplishment *of the safety *furict ion .. | |||
* 1 | * 1 | ||
* | |||
* | |||
*isolation valve position S25 and Miscellaneous 17 Yes No indication may be lost. This S26 Containment Isolation Regulatory Guide I. 97, Category 1 Valves instrumentation is required to*meet . . the single failure criterion. | '[r ..* | ||
The . ' instrumentation was *not upgraded with regards to physical separation when Regulatory Guide 1 .. 97 *was imposed by NRC Generic Letter 82-33 . . This was due to our failure to . recognize that physical separation criteria were not met. This is being evaluated to determine if the circuits should .be reverified to provide proper | Attachment * '. | ||
separation, .or if | LER 91-014 Supplement 2 Scheme Scheme Name Numb£!r. Operable Unreviewed C011111ent of Safety .. | ||
Cfrcuits Question 0408 .Control Rooin HVAC 1 Yes . No -failure of thts circuit does not Emergency.Actuation adversely affect accomplishment of the safety function; however, position indication for ventilation system dampers may be lost. This Regulatory Gui de 1. 97, Category 2 | |||
.. instrumentation is not required to meet the single failure criterion; S21 and Waste System . 19 Yes No Failure of these circuits does not S22 *Containment Iso1ati-0n adversely affect accomplishment of Valves *the S~fety function; however, containment *isolation valve position S25 and Miscellaneous 17 Yes No indication may be lost. This S26 Containment Isolation Regulatory Guide I. 97, Category 1 Valves instrumentation is required to*meet | |||
.* ., . . '. | . . the single failure criterion. The . | ||
of.** * * , Circuits | ' | ||
.. cables will be re-routed to provide FSAR | instrumentation was *not upgraded with regards to physical separation when Regulatory Guide 1.. 97 *was imposed by NRC Generic Letter 82-33 . | ||
* Sect lon 8. 5 .. 3. I. The fan*coolers are left channel but the power fot the fans ate .routed with right channel cables,. through a control room floor elettrical penetration. | . This was due to our failure to . | ||
recognize that physical separation criteria were not met. This conditi~n is being evaluated to determine if the circuits should .be | |||
.. | |||
* . > ' . . *' * | reverified to provide proper physical. separation, .or if * | ||
,. | |||
justifita~ion ~xtst~ to request NRC | |||
. . | |||
approval of a deviation from the | |||
. | |||
Regulatory Guide 1.97 requirements . | |||
2 | |||
*'* . | |||
* | |||
.* *- | |||
. . . Attachment .* ., . .*' '. | |||
*' ** LER 91:-014. ,Suppl emetit:. 2 *:: .* *.,* .: ~ . | |||
Scheme Scheme Name Number . Operabl~ Unrevi ewed . C011111ent of.** * * , Safety Circuits Question IL34 Pressurizer_'Wide :Range -No : ves* | |||
* Redundant insirumentS have cables | |||
-and Level * ~ . *~ | |||
rout_ed through one cable tray. .Both IL37 '. | |||
., | |||
.. | |||
*level instruments are identified i.n | |||
;,. | |||
I J.' | |||
"* | |||
*_the Te~hniial .Specifications .. Th~ | |||
cables will be re-routed to provide | |||
~eparation ~s f~quired i~: FSAR | |||
* Sect lon 8. 5.. 3. I. | |||
'8131 Engineered Safeguards 2 Yes .. *No* The fan*coolers are left channel but and Room Coolers fans V27A the power c~bles fot the fans ate 8133 and V27C .routed with right channel cables,. | |||
through a control room floor elettrical penetration. Failure ~f | |||
*.*** .. .. | |||
; -these circuits .does not adversely affect the accomplishment of the-* | |||
*. | |||
.. safety function as the redundant' - | |||
coolers cabl~s ,ate routed separat~ly | |||
.. ' *~ | |||
f~om these-circuits. * | |||
. *, t | |||
. ! . . > | |||
. . '* I',* | |||
... ~J ' | |||
. .*.. | |||
. ,* | |||
. ' | |||
**. . . **' | |||
.. *"'"** ' . | |||
... ***** ... | |||
.*., | |||
'' | |||
. *'*I | |||
~ | |||
. '}} |
Revision as of 19:17, 21 October 2019
ML18058A380 | |
Person / Time | |
---|---|
Site: | Palisades ![]() |
Issue date: | 04/24/1992 |
From: | Roberts W, Slade G CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
References | |
LER-91-014, LER-91-14, NUDOCS 9205010259 | |
Download: ML18058A380 (9) | |
Text
consumers
~*:,.
Power GB Slade General Manager l'llWERINli MICHlliAN-S l'llOlillESS
. Palisades Nuclear Plant:
- 27780 Blue Star Memorial Hi~hway, Covert. Ml 49043
- April 24 , 1992
- Nuclear Regulatory Commission .
Document Control Desk
- Washington, DC 20555 DOCKET 50-i55 - .LICENSE DPR PALISADES PLANT -
LICENSEE EVENT REPORT 91-014-03, - SAFETY RELATED CIRCUITS ROUTED WITH OPPOSITE CHANNEL CIRCUITS - SUPPLEMENTAL REPORT . .
License~ Event Report (LER) 91-014:03 is .attach~d.
- This event is _reportable to the. NRC per 10CFR50.73(a)(2)(ii), as a condition outside the design
~ ' *-
basis.
The original. LER 91.-014 was dated August 8, 1991, and provided notification.
- that a physi~al separation and channelization d~ficiency existed with* cabling
- associated with three electrical schemes. In that LER we rioted that becaus~
of an ongoing Electrical Cable and Racew.ay Separatibn Issue Res.elution Plan, we exp.ected to. submit additional information on this subject, as we expected that additional deficiencies may be identified. Supplement 1 to LER 91.-014,
.*dated February 14, l992, prov.ided information concerning additional.
- deficienci~s, their stat~s~ and planned resolution. Supplement 2 to LER 91-014 provided information on a cabl~ s~paration and channelization
- deficiency identified with pressurizer level circuitry* cable .. This attached
- supplement provides.informatiorr on one additional cable separation and *
~hannelization.defiGiency associated with the plants redundant*~ngineered safeguards roo~ ~ir coolers. Because programs afe in place to address these*
deficiencies, and have been described in earlier revisions of this LER, no
- major changes have beeh made to .the descriptions in this LER except for the addition of the latest.deficiency to the attachment to the LER. Any changes d 4 ; t ; c a f l i n e in the right.hand margin.
Gerald B Slade General Manager CC Administrator, Region III, USNRC NRC Resident Inspectdr - Palisades
NllCtso:r** U.I. NUCLIAll lllGULATOllY Cm9t1DIC*
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SAFETY RELATED CIRCUITS ROUTED WITH OPPOSITE CHANNEL CIRCUITS - SUPPLEMENTAL REPORT
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LX. I0.7JC.llJIUUI 111.n1a11211.1 LICINIH CONTACT fOll THll Liii 1121 T LEPHONE NUMBER ARIA CODI Will~am L. Roberts, Staff Licen~ing Engineer
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Through the on-going Palisades Configuration-Control Project a number of apparent discrepancies in circuit routing have been identified. Previ~us NRC correspondence dated September 4, 1990 and March 12,-19_91 provided details of the "Ci~cuit ~nd Raceway Schedule Enhancement Proje~t" and status of the projects .activities. The electrical .circuit channelization and separation deficiencies which have been evaluated at this time, while not conforming to FSAR criteria in all res_pects, have resulted in identification of very few conditi.ons involving a loss of ~lectrical ~r protection system independence; or noncompliance with lOCFRSO, Appendix R requirements". In those few cases compensatory measures and corrective actions have been taken as stipulated in plant Technical Specifications and/or the condition was promptly-correct~d~
The physical separation and channeli~ation deficierici~s that have been identified appear to result from two separate failures: 1) A non-uniform interpretation of design criteria for chann~lizing and routing electrical circuits, and 2) the unavailability of a single, complete .and reliable source of desfgn document*tion for electrical circuit routing and channelization.
At the time of the discovery of the latest discrepancy (engineered safeguards room cooler cfrcuitry channelization}, the plant was shutdown for a refueling outage..
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- OOCUT- llUl91* Ill
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- 11
- Palisades Plant Op 14 - - oI 3 o 12 oir. o 1s*
"",............ -------All"'.,.."" -
EV~NtDESCRIPTION T_he *Palisades Configuration Control Project (CCP) which was initiat~d in 1987
'included an effort to.veri.fy and correct plant electrical drawings, including the plant circuit and raceway schedule. - This effort involved development of a circuit and raceway schedule data.base, as well as-verification of selected portions.of circuit routings. Through this effort a number of apparent discrepancies in circuit routing have been identified. - This event involves_
approximately *40 circuits wh.ich were bel ie-ved. to be safety-related. cj rcuits routed with opposite channel circuits. Previous plant deviation reports
- involving apparently mls'-routed Circuits include D.-PAL-8~-147, D-PAL-90-40, D-PAL-90-221, and D-PAL-90-222. All of the apparently mis-routed circuits*
from these earlier deviation reports that have been evaluated,. have been dispositi.oned as either notb"eing safety-related and therefore channelized circuit rout~ng .is not an issue, or the cirtuit mis-routing .is nrit a ~afety
' concern because the failu~e of the cfrc~it does not lead to: undesirable consequences (i.e. the circuit fails safe). Additional backgrbund and*
information on the CCP circuit.and raceway_ enhancement *project was p~ovided to the NRC in our letter dated Septembe~ 4, 1990. * ~ st~t~s update on the proje~t c was provided. i,n -our letter dated March 12, 1991.
.
At- the time of th*e disc<?very -~of the 'latest discrepancy *(engineered safeg-uards
- roc;>m *cooler.s circuitry Channelization), the plant was shutdown for a refueling
-outage.* This event 'is :reportable as _a condition *outsid~ the des-ig!l _oasis of I
- . the pl ant. * * .
- - -*
. Cause of the Event*
~he physical separation and-channelization deficiencies that have been _
id~ntified appear t~ result from two separate: failures: 1) A: non-uniform interpret~tion of design criteria for channelizing and routing el~ctrical circuits, and 2) the una~ailability of a single, complete and reliable source**
of design docum~ntation for electrical circuit r9Uting and channelization.
Analy~is of the Event .*.. ..
Cable. Separation_ Design Criteria The desig_n criteria wfrich were or-ig.inally used at Palisades to provide - -
physical independence between redundant electrical tircuits were submitted to the Atomi.c Energy Commission (AEC) on May 28, 1969. This submittal contained, in part, our response to a requ~st for information regarding the criteria and_
associated bases used at Palisades during initial design and installation of*
- el~ctrical circuits. The ~uidelines that are currently used during design of electrical cables and rateways are essentially unchanged from those of the "original design period and are r~flected in FSAR Section 8.5.3.1. FSAR Section 8.5.3.1 states that circuits belonging to safety-related power distribution channels, reactor prote~tion system channels, engineered safeguards channels or other _safety-related syste!:ll channels will be run in
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separat~ raceway sy~tems; and that "physical separation; (dist~nce), is considered to ~e most reliable method of providing circuit separation and
- isolatton." ** * *
- In practice, the.design criteria fbiphysical separation and independence of.
electrical circuits are primarily satisfied by* routing electrical cables in chanryelized cable raceways, and by maintaining a separation distance between.
these*channeliz~d raceways .. Thts method of providing physical separatio~
between redundant e_lectrical circuits meets the intent of currently accepted standards and guidelines and has been reviewed and determined tobe
.acceptable. Palisades was designed pri.or to issuance of Regulatory Guide
.* I. 75., "Physical Independence of Electrical Systems," the AEC General Design
- *. Criteria for physical independence of electrical circuits, or.the*asspciated IEEE standards (IEEE 279' IEEE 384) . . ' .
Circuit Separatjon and Channel izatipn Anomalies *>
We have identified several examples where the cha*nnelization of installed .
electrical cables does .not satisfy our original design criteria .. The actual
. *number of electrical cable_ separation and channelizat1on discre,pancies_
. identified so far represents only,_a very small percentage (less. than orie percent) *of the over thirteen thous~nd* electrical cables that we have evaluated~ As a res.ult of these cable routing anomalies, we 'f1ave unde.rtaken a*
- progral!'lmatic effort to identify and resolve those physfr:a1 separation and ..
channelization discrepancies that may exist, and we have.taken steps to
- prevent prcimulgation of iimilar di~crepancies in1he future~ We have also**
taken actions to address the physical separation. *and *channelization * . *
- deficiendes-whicb h.ave been.identified to date. * ..
The electrical circuit chanri~liiation and separat*i*o*n deficiencies which *have been ~valuated at this time, while not cdnforming t6.FSAR criteria in all respects, have resu.lted in identification of very few safety-significant
- conditions involving a loss of electric;al or protection _system independence or
- .noncompliance with. IOCFRSO, Appendix R requirements. *In those few cases. . ..
comp_ensatory measures and corrective actions h'ave been taken as stipulated .in plant*Technical Spec'ifications and/or the condition was promptly c,orrected..
- . Palisades has taken an aggressive pos.ition i.n its response to the identified eleetrical cable routing and channelization discrepancies *through the Electrical .Cable and Raceway Separation* Issue Resolution Plan . . This plan*
- addresses the causal factors for these conditions and proposes actions to prevent reoccurrence. The key provisions of this pl an include:
- I')
publication of clear procedural ,guidance relative to cable routing design .
. criteria, 2} availability of reliable circuit design- information, 3) field
- review of installed raceways, and -4) evaluation and resolution of identified cable routing*and ~hannelization discrepancies. As we have done in the past, we wiJl evaluate confirmed cable routing and separati~n discrepancies for safety-significance and *operability impact when they ~re identified, and*
. compensatory and corrective measures will be. pursued, as necessary ..
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- This _event is being reported under lOCFRSO. 73(a) (2)(1i) as a condition. outside
~the des1gn: basis of.the plant .. :*
Corrective Action* ..
- .. _Corrective. actions a~dressi ng .ci rc.uit channel i ti' -and separation . ta on .
defi-ciencie~ began with _the Electrical Cable and Raceway Separation Issue .
- Resolution Plani *A suimriary anq implementat:ion schedule for these ac;tions was provfded fo our September 4, 1990, "Submittal of. Add,.itfonal informati_on
- Related to the-Cir*cuit and Raceway Schedule Enhancement Project," and .a status update was* provide4 in our-March 12, 1991- lett~r. The_actions and their
.. FUrrent status are listed below: * *
- "***.*,
- .. L * .The* des-i gn *'and n ~ens i ng :basis.: for thannel i zat.i on .and phys i ca i.
- *. : separation* of elect.rical circuits has been reconstituted _and * . . . .
- consolidated ,in a single.:dotument,_ the "Electrical S~paration. Desig*n * ..
- ,. C~iteria*~and Licens_i~g ~asis .. ". _* ... * ., . ... * . . *
.< . *.. * .'. ~. * . G~*i d~-~c~ *h~s~ been deve lOped Jn Admi ni strati v~
- Proc~dure ,'9 ~3~, ** . ** * .:** **'.
. . :;, -"Circu.it'. and Raceway Schedule!',~*. for contfol *and entry of _design* . ~ *~ *.::: . . _. -* ...
informat*ion-. in the)~a.~le_,*-~nd: Raceway Schedul_e (c~*sr datab~se . .
. :i.*,. *. . * * .** . , *,:* .*
o' C~ble ~outing.* requ.i ~'~merits and: .practi ~.ei ha~e **peen **_incorpo.rated- *i ntri * .. *.
Engilie~ring.-Guidelines: EM-22-.04~-- Ch'anne_l .Sepa*r~.tion ~- C'able;* * *':
- Routing* Instr_uctions;'" ..EM-:22-03, *"Fire Protection- - Cable *Route .... . ~
- Verification;'" EM-22-06; ."~able Routing - EEQ Requirements;'~ ****: *.
EGAD-PROJ.--:08, "Cable Sizing* Gujd.eline >Amp~city;-" and EGAD'.. PROJ*-03; * **' *' *
"Electrical Engine_erjng *sep,arat:ion Criter_ia; Prac.tiC:es and*_, ,. - . . ,:.
Except.ions; * . *. * ., * * * .. :: .* .. ;
. .' 1**."* . ** : ' *, . '
4~ A p_hysical:;rev1ew of *installed cable: raceways h_as been performed. fo order to identify i.nstallati9i:is *th~t do not -meet. desig.n * .
>req_ufreinents;_;. * ...-*.*.:._ *,** * * .,*'.*
- ~
,_-.
- 5;.*:~ Design tnforma~ion relative to the cha:~neli:£ation *and phy,sical
- roµting of electrical circuits and ra~eways will be erihanced._ Thts*-
attiori will tnclude validation ~nd.tcimpletion ~f informat.ion * .;:" ..
. . contained. in the .CRS database *and is currently expected to be
- . *
- comp_l ete *prior to ~eptember 30, 1992. * "..:
. . .
.6. * -Electrical cabie*:sepa-ration and channelization* anonial ies fdentified .
. during our review of physical *raceway installations .will .be
. evaluated and appropriate_ly dispositioned.. The sc_hedule* for* ,.
re solution of these i terns *iS. dependent on the number and' type of* .
. items identified during the revi~w.
.. ** .
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- Palisades Plant 25591 05000 0 1. 4 - .0 3 5 011 0 5
" _..;;;..:. 1'1IT , . _ ...........-........ -. ..........,.,i71 .--
For the specific circuits in this LER, the Configu~ation Control Project (CCP)
Electrical Cable and Raceway Separation Issue Resolution Plan is intended to address the root cause of this event and no further corrective actions to
- prevent. recurrence are proposed at this time. Remedhl actions for the recently identified specific circuit routings are as follows:
,*
A.* Since only class IE circuits require physical separation of . .
channelized circuits, the safety classification of each potentially mis-routed circuit will be ~e~iewed.
- B. -The in-.plant routing of .each potentially' mis-routed safety-related channeli.zed circuit wilr b~ verified.
- C.
- A further investigation of t~e original plant design basis for.
physical separation of safety-related ~trcuits was completed. Bas~d.*
on the results of this review, the EGAD-PROJ-03, "Electrfcal Engin~ering Separation Criteria, Practices, and exception~," was revised. * * *
- D. Each confirmed circuit channelization def1ciency *will be evaluated with regards to *equipment _opera bi 1ity and 10Cl'R50. 59; 'Appropriate **
compensatory measures and corrective actions as stipulated in.plant .
. . Technical Specifications will also be taken .. A list .of confirmed .
- . circuit channelization deficiencies is p~ovided in. the attachment to
.*this LER. . . . .
E. Physical separation of improperly channelized, safety"'.related circ~its will be established on a sched~le.consistent.wtth the
. safety significance of the deviation. * *
.. If 1t i's determined that' failure of the _improperly channelized, safety-related circuit does not ad~ersely affect ac~omplishment of.a
- . safety function, the circuit may be left as currently routed. Such*
conditions will be clearly documented in the* Circuit and raceway sc~edule~ * * * * *
- F. Confidence in the accuracy *of the.circuit routing data in.the Circuit and Raceway Schedule was evaluated,. and it was determined ,.
that additional verification inspettions are not needed to assure *,
that circuit channelization deficiencies have been identified.
Addition~l fnfo~mation Previous submittals of this lER, dated August 8; 1991, February 14, 1992 and March 10, 1992 have identified information on other.cable separation discrepancies.
Attachment
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LER 91-014 S~pplement 2 CONFIRMED CIRCUIT CHANNELIZATION AND SEPARATION DEFICIENCIES Scheme Scheme Name NUinber *Operable " Unreviewed
- Co11111elit of .. Safety Circuits Question 8293 Die~el Gener~tor Room 2 . No No When: the erinditicin was discovered a.
Cooling Fan V24C .
- temporary modification was performed to remove reliance on V24C;' This .
'
-
circuit has been re-routed to provide proper physical separation.
..
S65 Reactor Prcitection 1 *. Yes No Failure of circuit d6e~ not System adversely affect accomplishment.of the safety function.
... .1 IP 73
- P~essurizer Narrow .,
No . . Yes When the condition was discovered a Range Pressure . .. temporary modi fi.cati on was performed to discorinect the circuit.
- Proper.
physical separation will be
.. *established .
sos Service W~ter System 1 . Yes . No Failure of this c i r*cu it does not Valves adversely affect accomplishment of
.. the safety function .
"
G06R Diesel 1-2 Auxiliary 1 *No. No Fail~re of this circuit does not Skid adversely aff~ct accomplishment-of
"
the safety function in short term.
(2-4.hours). Long term operator
.actions are addressed in *plant
. .
proced~re~. Proper physical .
" separation will be established .
..
Sl6 Crimponent Cooling J . Yes No Failure of this circuit does not Water Valves* adversely affect accomplishment *of the safety *furict ion ..
- 1
'[r ..*
Attachment * '.
LER 91-014 Supplement 2 Scheme Scheme Name Numb£!r. Operable Unreviewed C011111ent of Safety ..
Cfrcuits Question 0408 .Control Rooin HVAC 1 Yes . No -failure of thts circuit does not Emergency.Actuation adversely affect accomplishment of the safety function; however, position indication for ventilation system dampers may be lost. This Regulatory Gui de 1. 97, Category 2
.. instrumentation is not required to meet the single failure criterion; S21 and Waste System . 19 Yes No Failure of these circuits does not S22 *Containment Iso1ati-0n adversely affect accomplishment of Valves *the S~fety function; however, containment *isolation valve position S25 and Miscellaneous 17 Yes No indication may be lost. This S26 Containment Isolation Regulatory Guide I. 97, Category 1 Valves instrumentation is required to*meet
. . the single failure criterion. The .
'
instrumentation was *not upgraded with regards to physical separation when Regulatory Guide 1.. 97 *was imposed by NRC Generic Letter 82-33 .
. This was due to our failure to .
recognize that physical separation criteria were not met. This conditi~n is being evaluated to determine if the circuits should .be
..
reverified to provide proper physical. separation, .or if *
,.
justifita~ion ~xtst~ to request NRC
. .
approval of a deviation from the
.
Regulatory Guide 1.97 requirements .
2
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. . . Attachment .* ., . .*' '.
- ' ** LER 91:-014. ,Suppl emetit:. 2 *:: .* *.,* .: ~ .
Scheme Scheme Name Number . Operabl~ Unrevi ewed . C011111ent of.** * * , Safety Circuits Question IL34 Pressurizer_'Wide :Range -No : ves*
- Redundant insirumentS have cables
-and Level * ~ . *~
rout_ed through one cable tray. .Both IL37 '.
.,
..
- level instruments are identified i.n
- ,.
I J.'
"*
- _the Te~hniial .Specifications .. Th~
cables will be re-routed to provide
~eparation ~s f~quired i~: FSAR
- Sect lon 8. 5.. 3. I.
'8131 Engineered Safeguards 2 Yes .. *No* The fan*coolers are left channel but and Room Coolers fans V27A the power c~bles fot the fans ate 8133 and V27C .routed with right channel cables,.
through a control room floor elettrical penetration. Failure ~f
- .*** .. ..
- -these circuits .does not adversely affect the accomplishment of the-*
- .
.. safety function as the redundant' -
coolers cabl~s ,ate routed separat~ly
.. ' *~
f~om these-circuits. *
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... ***** ...
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