ML20210C605
| ML20210C605 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon, South Texas, 05000000 |
| Issue date: | 09/04/1975 |
| From: | Parr O Office of Nuclear Reactor Regulation |
| To: | Morrissey J PACIFIC GAS & ELECTRIC CO. |
| Shared Package | |
| ML20210C503 | List:
|
| References | |
| NUDOCS 8705060243 | |
| Download: ML20210C605 (7) | |
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NUCLCAR RCGULATonY C O t.t t.115 SIO tJ e.'
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Pacific Cas and Elcetric Co:pany ATTN: !!r. John C. :'orrissey Vice President and Ccncral Counsci 77 Ecale Street San Francisco, California 94106 Gentlemen:
Enclosed are the resuitc of our revicu of the !?cstinghouse Protection Syste:1::oisc Tests p.cport, dated Dece bcr 1974, and Supplenent 1, dated February 20, 1975.
This report provided the scope, :cchnical cons'dcraticas, accep:ence criteria, tesc procedurcs, and resul:s and conclusions for the '<ies:inghouse supplied systems.
0,2r detailed review of the subject report is con:cined in Enclosure 1 and referenec?a used arc iden:ified in Enclosure 2.
As indicated in
' cur detailed revicu, ve find the subject report acceptabic ri:h the follouing excep:icas:
- 1) The accep:ance cri:cria must ba.:dified, and 2) the noise su:ceptibility tes:s for the Ancio; Precess Cen:rol Systen cust be nodified tnd repen:cd as indicated in the recule:
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put.itien portien of the revicu.
t c reco=cnd tha: you p r: vide us vi:':.
a r.odif2.cd tes: progran for cur evaluatica prior to conduc'ing and N-- -
inplencating the :ests.
In order to prc'eced with our licensing revice, please inf:rn us within seven (7) days af ter roccipt of this letter of the schedule you vill be abic to noct in responding to our concerns re;ardin's the sub,8c::
This natter. cust be resolved in an accep:able -anner before report.
operating liccases for Diablo Canycn ll nits 1 and 2 can be issued.
Sincercly, 6 LV I c-Olan 1). Parr, Chief Light 1later Reactors Project Branch 1-3 Division of Reactor Licensing
Enclosures:
1.
Detailed Review of Subject Report 2.
References cc:
See page 2 ATTAC H M E N T A
8705060243 B70430 PDR ADOCK 05000498 A
PDR r
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- pgegric Cas and Elcetric Ca,pany
-2 SEP 0 4 1315 cc: Philip A. Cranc, Jr., Esq.
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Pacific Cas and Electric Company i
77 Beale Street-San Francisce, California 94106 Andrew J. Skaf f, Esq.
California Public Utilitics Co=nission 3501:cA111 ster Street San Francisco, California 94102 i
Mr. Frederich Eissler, President i
Scenic Shorcline Preservation *
- Conference, Inc.
4623 :: ore ::csa Drive Santa Barbara, California 93105 Ms. P.nye Ficcing 1746 Cho'rro Street San Luis Obispo, California 93401 lb. Sandra A. Silver 322 S. Plymouth Blvd.
Los Angeles, California 90020
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I!r. John Forster 985 Palm Strcot San Luis Obispo, California 93401 Mr. Uilliam P. Cornwell P. O. Box 453
)forro Bay, California 93442
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Mr. W. J. Lindblad, Project Engineer Pacific Cas and Electric Co=pany 77 Dealc Street San Francisco, California 94106
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!!r. Cordon A. Silver 322 S. Plymouth Blvd.
Los Angeles, California 90020 1
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'EVALUATIO:10F Tl!E i!ESTI G!!OUSE PROTECTi0:1 S r
1,0 Summa ry of Renort The subject report was initiated as a result of our cencerns relatino
, to the qualificatica of electrical isolatien cevices, desica criteria requiring electrical and chysical separatica betxcen ::re:eitica and control circuits and "as built" protectica systems ic.;nity to electrical noise.
iluclear Pc.:er Statien. Units 15 2, dated 0:te:er 16, the CP reviews of both units the
'ysical and elehtrical istictica ofthat during protecticn and control ucs not adequate and the ir.ple en:a:icn of the design presen:ed in the FSA't d:es net t.:eet the requirements of Secti:ns 4.2, 4.6 and 4.7 of IEEC Std 273-1371.
The voltases and test tethods were selected to cover che c and noise ::ndi:icr.s fcr the sys:e s ::s:c:.
folicains a::e;;ar.cc criteria for al.1 :ests.
'les tin;::.se caff acd the
!!oise would not degrade the ability of the protectt:n systets a.
to previde the necessary ac:ica b.
!!oise which causes initiaticn of pr:te:tive a:ticas, if any, would be acceptable.
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The test report was divided into three f.ec:fons covering the follefdn; llcstin;heuse s;; plied systems:
Section A Solid State Protecticn Syste 1 (SSFS).
A::endix A of this section ecntained isola:i:n verifica:ic. :ests and results for tne lient emit:ing dicdas (LE:s) used for isolatien in the SSPS.
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Sectien B fluelcar Instrumentation System Section C Process Analog System 7100 Series s
Test _00scriptic s
' The above identified systems ucre sebject to the follcuing tests.
Representativo casnnels were energi:cd and the functional crerability checked for cach test.
i iloise Susce-tibility Tests - These tests were run in accordance with I
MfGPliDMJ, caico June T.1960. Ullitary Specificatien - ::uclear Propuisten Centrol and Instrumentation Equipront, Canaral Requiretents, l
, Paragraph 4.6.11. Susceptibility.
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Output, rg.ble Voltam Faults - The maxinwa credible voltages (118 Y AC
".and 250 V DC) wire applice to cac'i systen output cabling to d2termine the effect cr,) the innut sid2.
Tuo additional tests were ecneucted on the Analog Process Systen.
A 450 V AC fault test and a 125 V CC
,e test switching a 2.17h inductive load to sirulate the inductive '
component of the isolator cutput circuit.
The isolator output circuits
.wcre discennected during the fault tests.
The isolators and connectors
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have already been cualified for fault voltaces and current; uhicn
- verified c;crobility of the inpu: sido during costructicn of cc::enents in the cutput porti:n of the isolator.
The cu. ut ccole voltag2 favi:
tests ucre to verify the adequacy of the cabic separation (input /ou:put) of the "as built" systems.
Jhon.g, tic *nteri:reate TEs:s - These tests were cenducted by discenne ing the ou;put ccales ano intrc:u: ing a 113 7 AC ;i:.cr scur:e and providing a 100 oh= lead at tho'cc.noc:ce and to allcu i a pere to fl u in the out:ut uiring.
The input side of the is01ator was menit: red for induced noise.
Since the inpu:/ca:put ut rir.; in :ne Frecess Anaieg Systo cre closer than the other.'sys:c:s :he 1 ampere AC current was routinely switched.
Light Erittine Diede ('.E31 Veri fics:t e. 72sts - These tests were condu::e: :y in:r::::in; a c:rm:n
- v:.::;e scur:e to tr.e isolati:n board.
A 2 Ky de dynar.ic scur:e a.d fr:: se tests c: 2 kV peak, i Ph:
ringing d:an in 6 - 13 cy:les a:;ifed f:r 1 r.inu:2.
A 10 V res 53 hz dynamic scur:e was a: plied to :he cut:ut side cf the isola:Or end the fault v:lta;2.
input r: nit: red to c2:er.i"e the offe:: of a g:s;ru: is c:;iicd cr.
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The tests..ers cerfere:d to ce. nstra:2:ha: ::::ntic the ncn-pre:2::icn sido are not dirc::ly ( flasn:.er) or indirec:iy (induced er capacitan:o) coupiad into the pr::c::ica logic sics.
The basis for selecting t!'e 1 f. p value fer the magnetic interference-tests described abov2 were based en an analytical study.
The cai:ulaticn considerad untuisted centrol cables runnin; ;arallai for ~3 retars
) tith three-phase ccccuctcrs carryin: 23 ar. cres.
The induced 10cp current was c:1:ula: d to t: 2.7 miirc-ce eres in a IC3 ch-load.
The 1 amperc was selected to provica a c nserva:ive value for :he test.
Test Procedures 02scricti:n and P,osults The test report provided detailed test pre:edures and descriptions for
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the tests identified bove.
llestinghouse sunari:cd the results of the tests for cach of t.he systems tested.
2.0 Sun: nary of Renulatory devicu We revicued the datailed test procedures, sctuu. description,
' functional checks and test results for the systems icentificd in the suciary of the report.
The results of all the tests
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conducted indicated that the tests p.;rform:d did not intreduce
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interference ce noisa fro"t the non-safety te the safety partion of the systea..
ihe functieaal verif k..;)ca paruen or tne :ests indicated that the equipn.ent performad as ecsigacd Defure, during 8
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3-and after, tests.. The safety functions of the systems were exercised during the test.s.
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- As 5tc have indicated in the summary of this report, the test program was initiated as a result of our concerns relating to the lac % of physical separation between the protection and control circuits in the final ir.:pleacntation of the sys:cn designs unich c:vid result in interaction between control and safety functior.s.
5cstin:.S use has indicated as part of their acec,:cnce cri;cria that r.cisc which causes initiation of protective acticns, if any, w uld be accc::able.
ife find this criteria unacceptabic.
IEEE Std 279-1971, recuires that the protection syste, snall, with precision and reliatility, auto-matica11y initiate acprepriate proto::ive action unenever a c:ndition
. monitored by the system reauies a pr e-set level.
The tests pericr. ad by llestinghouse indicate that the systems are adequate for those tes s
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perforced.
ile have concluded that the tests 'and results "fcr the 5 lid State Protection Systcra and the !;uclear Ins ru er.:a:i:n S/s::, are a:c:: Ate
. to de castrate non-in:orac !cn sf the safety and c:n:r:i fen:.icns.
Ilouever, we have concluded that the r.oise s s:c :i:iii / :ss:s fer the Analog Process Con:rcl Syster are er.:::c::a:;e.
Tre re airi ; tests and results for the Anslo; prc: css C:mrsi Sys:sn a.e :::e:::;je.
The input and cutput cabling in Anale; ~r::sss C:n:rol S/s:s: cc:incts are physically in the same utre ways i:n ns so:ces;i:..
A::iticnal a;ne-i:
interference tests were perfcenad i:r tre Ar,al:; *-r:::: s C:r.rci p)
System and r.ot the othar systcrs.
- le have ccnciu
- od :n:: :.E n0ise susceptibili;y tests f;r the c;her sys;e.s were a:c:uate c:40 to the fact that physical secaration exists an: :he proximi:/ of the inpu:/
output cabics is for a short distance.
.lle u111 require that modified i41L '-1990 E ::oise Sus:c::ibility Test Progracs or a new progrc.n.:: initia:cd for the Maic; pec:ess Sysic :
which will include the followin: recuircren:s.
The :ss: pr ;ran will include all the provisions or similar rargirc :.:s of '4*L-h-MI"02.
lloucver, the noisc. source output c::Ic snill ran in tre sa c c'.ble ways, vertical and hori: ental, as the input /:u::ut cchles of the Analog Precess Syst.cn for tnc cis::r:c c fine: in :no :< L. 5:cc.
test progran.
The basis for the IS-inch distance frc, the r.oisa source output cable for the equipe:nt tested in the 41L->l9s;03 tests is that typical cabicuays aboard snt:s are IS in:nes wide.
If tha installed equin,:ent experiences noisc interference pecklens, the scurce l
l can be detected and so:arated by at least a distance of 1S inches.
lle utili:cd IEEE Std 270-1971, " Criteria for Protcetica Systens f or h'uclear Pa.:ce Generatir; Stations," in. cur revicu of inis i cstin?"cuse Test Report.
Other references used are included in Enclosure 2.
Regula tory posi tion _
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I!c have concluded that the tests and results as documnted in the report are acceptable for the Solid State l'rotectiun Systeni, the liuclear l'ns truxntallen Sy4 tem. l.ignt trti tti"n l'lede% J"d t"0 A"dI0')
Process Control Systent with the exception of the noisu susceptibility tests.
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4 ife requir,e.that the acceptance criteria be ch:nged to ir.dicate that noise which ct.uses spurious initiation of a crctcction c:ticr. cr
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function will be it,lcntified.
If the spuricus trips or initi; tion of protective actions occur due to lack of separation, we will rcquire a design change to provide adequate separation to clininate the spurious operations.
1.'c require tha t a nodified 141L-l1-199'43 ::oise Sus:cotibility Test be initia:cd for the Analog I'r::ess Systenf Progren or a new progra that will irclude the recuirc-ents ider.;ified in tne Surt.ary cf P.cgulatory Revict pcrtion of this re; ort.
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The requiiuuni.s of Regulatory Guide 1.75, "Ehysicci Ir.dere :er.ce of Electric Systcas" r.:ust be r.:et for any noa system desi;r.s ar.: for all desiens which ccnstructi:n ::ermi: a;:lica:icr.s for..ic
- he issue date of the Safety Evaluation Report is Febr.;sry 1,1974, er af ter.
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a RCTEREilCES Report of Procccs Instru.T.cntation Isolation Amplifiers, dated I
liarch 28, 1973.
~ !!cstingP.ouse Topical !!ct: ort !-! CAP 7432L Solid State Protection Systcra Description, dated Jcnusry, 1971.
Surg.ary of Electrical Site Visit and I:ecting licld on February dated i: arch 10, 1974.
20-22, 1974, Sun:rsry of ibetin9 with !!0stinfmuse Electric Corporation', dated August 7,1974.
Safety Evaluation P.erort, Diablo Canyon i;uclear Power Station L' nits 1 and 2, dat.ed October 16, 1974.
Sur.cary of i't:cting held February 6,197'5 to discuss separctior, cr.d qu:lificoticn, dated i: arch 5,1975.
IEEE Std 279-1971, " Criteria for Protection Systems for !;ucl,cci Pcuer Ger.orttir.; Statiens".
Regulctory Cuide 1.75, " Physical Independance of Electric Syste:.:5, Revisten 1",
dated Jantcry 1975.
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