ML20115C410

Confirms That Suitable Isolation for Spds/Emergency Response Facility Data Sys Provided,Per SER Open Item.Devices Used to Provided Electrical Isolation from Safety Sys Instrumentation & Control Circuits Listed

ML20115C410
Person / Time
Site:	Hatch
Issue date:	04/09/1985
From:	Gucwa L GEORGIA POWER CO.
To:	Stolz J Office of Nuclear Reactor Regulation
References
1539N, NED-85-191, TAC-57465, TAC-57466, NUDOCS 8504180387
Download: ML20115C410 (18)

Text

{{#Wiki_filter:. .gs; ' ' N. . Georgia Power Company E333 Piedmont Avenue y.=. ,-j Atlanta, Georgis 30308 -

Telepinie 404 5266526 D Maihng Address:-..

. Post Office Box 4545, Atlanta. Georgia 30302, Georgia Power

C T.Gucwa the southem etectnc system Manager Nuclear Engmeering ;

and Chief Nuclear Engineer EO-85-191 1539N April 9, 1985 Director of.Nudlear: Reactor Regulation Attention: Mr.' John F. Stolz,-Chief Operating Reactors Branch No. 4 Division of: Licensing - U. S. Nuclear Regulatory Commission Washington, D. C. 20555 EC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, EF-5 EDWIN I; HATCH NUCLEAR: PLANT UNITS 1, 2. PESPONSE TO SAFETY PARAETER DISPLAY SYSTEM SER OPEN ITEM, ELECTRICAL ISOLATION CONCERN Gentlemen: The subject WC Safet'y Evaluation-Report (SER), dated February'14, 1985, concluded that1 the Safety Parameter. Display System / Emergency._ Response Facility Data ~ System (SPDS/ERFDS)_-ifor Plant' : Hatch. Units 1 and 2 is acceptable for implementation except fcr confirmation that the' systems-are .provided with suitable. isolation. This letter provides _the requested confirmation of suitable isolation along:with supporting documentation.

The ' following devices have been used to provide electrical isolation-of N,.

the:SPDS/ERFDS from safety system' instrumentation and control circuits: i % N 1;- Foxboro Inc. isolators for analog circuits.-

2.

. Rochester Instrumentation ~ Spstems Inc. (RIS) digital optical

isolators for digital circuits.1 L3.

- Relays for digital circuits'.. 4. Fuses for ' digital circuNs.. The:: actual interface ' with SPDS/ERFDS system ~ is 1with.an c existing non-Class ale circuit. The. existing - -l

non-Class lE ccircuit-- is isolated ' from Class 1E : control circuits by.

L fuses :per the original' design 'of, the: plant. Fuses are addressed ~l

here and throughout the response (for: thoroughness and clarity, j

5P zControl switches.for digital circuits.. gel !W M O mpg, y up-m 4.

~ a q J.- jGeorgiaPowe [ iDirector'of' Nuclear [ Reactor Regulation. Attention:l Mr. John'F. Stolz,- Chief ' Operating Reactors Branch No. 4 -{ Division of Licensing; April 9,.1985 Page 2 ~ Part nI of!this letter is the response to requests for information from 4 itheTsubject SER;:: :Part IIEis a" description of the. ; isolation design ' and Tjustification for not testing certain isolation devices.

1. I.: - RESPONSES TO REQUESTS FOR IWORMATION t

Requests for;information are. restated, followed by the GPC response: a

Request:-

a..

"For each type of device used to accomplish electrical. Isolation, describe : the; specific. testing performed-. to - demonstrate - that the device is acceptable ~ for -its application (s). Th.'s description should ; include ' elementary diagrams when necessary to indicate the

test' configuration and how the maximum credible faults were. applied to the dtivices."

Response

l.; Foxboro Isolators for Analog-Circuits - Refer.to information submitted previously by -letters of. June 7,1984 and; August 7,1984 from L.~ T. Gucwa of GPC to Mr. John F. Stol: of.NRC. . 2. RIS' Dialt'al Optical -Isolators for Dicital Circuits - According to-

the:. vendor-supplied 1 instruction. manual,. t' a isolator has been

-tested to -withsta.nd a 4 KVisurge voltage t.:tweenj output 'and input with no isolation breakdown. ~ Additional;t_esting.for short-circuit fault conaitions.was performed by. the Lyendor at our requestt in response :to previous discussions . with the'~ WC reviewer on this subject. ' Refer-to ' Attachment '1, RIS ' test; report -(letter from:RIS to ;Bechtel of November 27,1984) for response of the L equipment" to ashort. circuit fault: conditions. No- ~ ' component damage:or isolation. breakdown.was noted. ~ 3.- -Relays. for-Digital Circuits -' 'No. specific. testing - was done to demonstrate -that relays Eare ' acceptable for' their-application.-

Refer to

page E7' of.. this--letter for a description of the, use. of

>. relays' for isolation and for; justification for not testing.. -4.~. Fuses for Digital" Circuits ; - No.especifici testing iwas ' done 1to demonstrate that{ fuses are : accept'able for their : application. : Refer.. "f FA A n .g

1:[. / - y z ' ~ ~ 3

4a s

~ .- g g.? ,s j IGeorgiaPower mA: m i Y

-Director' of-Nuclear Reactor Regulation.

1 r.; John F.'Stolz, Chief " Attention: M y"' Doerating Reactors Branch No. 4' Division of Licensing- "~ iApril;9,c1985L .Page 3: t to:page~ 8_ of this L1etter for a description of the use-of fuses for ~ 11 solation 4and for justification for not testing. 5. ' Control Switches ~for Digital Circuits - No specific testing was ..done to demonstrate that. the spare switch contacts are acceptable. Re. er to page 10 of this letter. for : a for-their :. application. f

description., L of 1 thei use' of " switches for isolation-and for

} justification:fornottesting. Request:. '.ts " Data to verify' that the maximum credible faults. applied during the " test were'the maximum voltage / current to which the devices could be exposed, Land define _how the maximum voltage / current was determined."

Response:-

1. -Foxboro Isolators for Analog Circuits Refer to~ previously ' submitted. letters of June 7,1984 and August 7,1984 from L'. T. Gucwa ~of GPC to Mr.' John F; Stolz of NRC.' ~

2.

RIS Digitali Optical Isolators for Digital-Circuits - All outputs , from the optical--isolators to the multiplexer; are run in raceways- . dedicated Jfor: control circuits. The maximum.possible= Voltage -in ~ those J trays : as Twelli as 'within the cabinets is. 208 ' volts'. The isolator module ~ contains an Eoptical coupler ' tested for protection

against a 4 KV'-surge between - the.1E' side and' non-lE-~ side. 'This

? demonstrates-that the device was tested for faults greater than the-maximum fault voltage due toLthe~SPDS/ERFDS. - The - highest 3 current; through 'the ' isolator. output < is= the-fault-Icurrent from the multiplexer power supply. - Themmultiplexer power. l

supply ~is rated 5l amps. :The RIS test (Ref. Attachment 'l)t used a 10 anp supply which provides la much -higher l 1evel-of } fault. current ^ (56 amps J of 1short : circuit surge-current 1was; measured)'.-

The. test _ m configurationfused the 'same n fuse" as the: ~ actual y circuit 'and ! an 1 ' resistor 1 was-used to :representi ther minimum 1 circuit, conductor' flength. : :This demonstrates : that the Ldevice was itested ; for faults - f greaterithan the maximum fault current =due:to.the.SPDS/ERFDS.. j 3. Relays'I forMDigital Circuitsi-No: specific-[ testing. was ~done to ,*f demonstrate -that : relays are ; acceptable LforE their:. application.- Q Referito, page17f of: this; letter for(a 1 description ~of the. use.'of Yrelaysforfisolationandforjustification=fornotitesting.: 2 M' w.- ? i$ 'Jg h ;_ 7 + ,s r i {, ' M7$

~ ~ ~ ~ ~~ n~ m w -::c 7 A -,.gd,-' = 7 GEorgiaP6werk 2 Director of: Nuclear Reactor. Regulation LAttention: Mr. John F. Stolz, Chief' ? Operating Reactors Branch No. 4 Division of. Licensing 1 ' April;9,'1985-2 'Pagef41 s 4. - Fuses for ' Diaital : Circuits No specific testing was done to demonstrate that fuses are acceptable for. their application. Refer uto;page 8 of thisiletter fcr a description of the use of fuses for isolation end for_ justification for not testing.

Control Switches' for Digital Circuits

- No specific -testing was -5.. done.to demonstrate that-the spare switch contacts _ are acceptable ifori theiri application.. Refer 'to page 10.of this letter for a

description :of the use of switches for. isolation and for ejustification for not testing..

Request: c. =" Data to verify that the maximum credible fault was applied to the output :of the device in the transverse mode (between ' signal and return) and other2 faults were' considered ~ (i.e.' open and ' short ' circuits)." . Response: 1.' Foxboro Isolators for Ansloa Circuits- - Refer to previously submitted letters ofmJune 7, -1984 and ; August 7,1984 from ? L. T.. Gucwa ~of GPC' to Mr. John F. Stolz of. NRC. 2. RIS Diaital Optical Isolators for Dicital Circuits - The RIS EI4400 series -isolator modules were-tested to yassess the, ability to maintain Lisolation between..the,1E input and ~non-lE' output during a. 4 'KV surge.at ~ the' output 'and during a short circuit fault condition at the: output. ' Testing for the 4 KV surge'isidocumented in~ the -vendor's instruction manual.: Refer L to Attachmentn1-for-details on i.esting 'during a-short-circuitifault-'at the' output.. Open circuits Eon the: output have no affect based on operating " characteristics of the optical; isolator. 3. Relays :for Diait'al' Circuits t No specificitesting' was done-on this - . Isolation device because.there is no credible? mechanism whereby the Efunction'of a-Class lE' system canibe compromised.- Refer:to page 7 -of:this> letter for a description of the use of_ relays. for isolation u Land for; justification ~for not-testing., 4 (4. [ Fuses E for1 Digital? Circuits L - Noispecific jtesti,ng was' doneI to ~ 4 _ demonstrate that fuses are acceptable-for their application.< Refer ? ( MOTFS

j-s, 7 K-- m.X Y 5. f _.__ (. 4~, s, ~ '.l , n n :_ v - d.- ~ ( .I' ' IGeorgia P6wer L ~ = ~ Director [ofNuclearReactorRegulation EAttention: Mri John F. Stolz,. Chief . Operating Reactors' Branch No.-4: l Division.of-Licensing = fApril 9, 1985:, - Pagef5' 4 to page 8' of; this letter for a description of the use of fuses for isolation and:forJjustification for not testing. '5. . Switches - for-Control Circuits. '- No specific testing was. done to demonstrate : that switches are % acceptable. for their. application. 'J' - Refer - to page '10..of :thisf etter for' a descriptionf of the use of l fuses for isolation and for justification for not testing, u Request: 'd. ~ " Define the Pass / Fall acceptance criteria for each type of device." Response:-, .1; Foxboro Isolators for -Analoa:' Circuits - Refer. to previously submitted letters of June 7, 19841 and AugustL 7, ~1984 from. L. T. .Gucwa of GPC to Mr. John F.:Stolz of-NRC. ~ c 2. ~ RIS' Digital' Opti al Isolators for Dialtal Circuits - Device shall

isolate Class lE devices' from any credible fault' in the ' non-Class

=1E circuits, such that ' safety function, of the Class lE system is' ~ not compromised. 3.. , Relays for Digital Circuits - Device; shall' isolate Class lE devices- - from all credible faultsu in the non-Class-'1E. circuits,.such that-Jsafety' function of the Class 1E system ~ is not compromised. Relay L contacts shall-be rated above 208' volts, and contact welding-due to overcurrent on' relays' used ifor SPDS/ERFDS circuits shall have no 2: ~ effect-on ^ the? safety function of Class '1E circuits.- -(Refer to ~

Page 7T.1

~ e I-7 l. 4.- Fuses for -Digital Circuits Device 'shall isolate Class-1E. devices 1 from.all credible faults in the' non-Class 1E' circuits, such that

safety l function c of ithe ' Class 71E1 system is not compromised. - : The -

p - fuse.~ time overcurrent- : trip-characteristics. shall ;cause - the i ' isolation i fuseEto open 1 prior Lto : initiation sof..an D opening ' of 1the '. upstream fuse. ;(Refer to Page. 8). I 5.- Switche's f$r" Digital Circuits ; -Switch L function J shallE not.be compromised bycany ~ credible fault fin l the' non-Class flE ; systems.. l Switch contacts ~ shall' bei rated above 208 ivolts, and 'the J switches shall beiablei to.. withstand ; the maximum ! fault a current. i(Refer ;to [ m liPage:10).

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e LGeorgiaPo ver Director. of. Nuclear Reactor Regulation ~ Attention:_. Mr.: John F. Stolz, Chief J0perating Reactors Branch No. 4~ . Division of Licensing

April 9, 1985:

Page 6 Request: e. " Provide - a comitment that the isolation devices comply with the environmental qualifications.(10 CFR 50.49) and with the seismic-qualifications which were the basis for plant licensing."

Response

1. Foxboro Isolators for Analog Circuits. - Refer to-previously -submitted letters of June - 7,- 1984 and August 7, 1984 from L. T. Gucwa of GPC to Mr. John F. Stolz of E C. 2._ RIS Digital Optical Isolators for Digital -Circuits The RIS digital optical isolators are located in the. main control room which is a mild environment area, as defined. by 10 CFR 50.49. .Accordingly, no specific environmental ~ qualification-is required per 10 CFR 50.'49. All equipment'is seismically qualified.- -3. Relays for Digital' Circuits - Except for one, all' panels housing . relays are located in the main control-room which is a mild environment area as defined ' by 10 -~ CFR 50.49. :Accordingly, no - specific environmental qualification is required. One panel housing the relays is located in reactor building elev. 203'0", which is a harsh' environment area. Even - though the panel is located - in a harsh environment, Class lE ' circuits - being ' isolated ~ i are' not ~ within the NRC-approved scope of equipment to' be -qualified per 10. CFR 50.49 (IEB-79-018). _ Hence no specific environmental qualification is required. All equipment is seismically qualified. 4. Fuses for Digital Circuits

The panels housing fuses are -located in.the main control room which is a mild environment area as

- defined. by 110 CFR 50.49. ~Accordingly, no. specific-environmental qualification is required. per 10CFR 50.49. 'The motor control ~ centers housing fuses are located 'in the reactor building elev. 130'-0" which 'is a harsh environment .for which they are environmentally qualified. All equipment is seismically qualified. '5.- Switches - for ' Digital'. Circuits - The panels housing switches are located in the main control room 'which is a mild environment area as-defined by 10 CFR'50.49.. Accordingly,_ no : specific ; environmental 700775.

n - Georgia Power A Director;of Nuclear Reactor Regulatio'n Attention: Mr. John F. Stolz, Chief. j Operating Reactors Branch No. 4 Division of Licensing April 9, 1985 Page 7 qualification is required per 10 CFR 50.49. All equipment is seismically qualified. Request: e. " Provide a description of the measures taken to protect the safety ' systems from ' electrical interference (i.e. electrostatic coupling, EMI, common mode and cross-talk) that may be generated by the SPDS."

Response

Isolation devices described in this letter do not provide isolation from electrical and electromagnetic interference. Isolation of the SPDS/ERFDS is ' considered adequate because equipment used meets . Mil-Spec and FCC standards for protection. from such interference. Refer to previously ' submitted letters of June 7,1984 and August 7, 1984 from i L. T. Gucwa of GPC to Mr. John F. Stolz of NRC for additional information. II. ISOLATION DESIGN AND JUSTIFICATION FOR NOT TESTING CERTAIN DEVICES All Class lE analog signals are isolated by fully tested and seismically qualified Foxboro isolators. Eight hundred of the approximately 1000 digital signals are isolated by fully tested and seismically qualified Rochester ' optical ~ isolators.- Relays, fuses and control switches were used for isolation devices only in-cases where isolation could not be reasonably. accomplished by other means. Each case where this was done was' examined to confirm that isolation provided was adequate. All isolation devices used for protecting Class lE circuits are seismically qualified. The following is a discussion of the -isolation design for the Hatch SPDS/ERFDS. .l. Foxboro Isolators for Analog Circuits Refer to information submitted previously by letters of June 7,1984 and August 7,1984 from L'. T. Gucwa of GPC -.to Mr. John F. Stolz of. NRC. Testing demonstrated-isolation of all credible faults due to~the SPDS/ERFDS. 2. RIS Digital Optical Isolators ' for Digital Circuits -- Refer to part

2. of. sections a..through - e of this letter.

Testing' demonstrated isolation of al1~ credible faults due to the SPDS/ERFDS. 3. , Relays for Digital Circuits--- Electrically;-independent relay . mns

w w. p ,*4 q e s ir .M~ c-T y: ',' r y,; ww 3 Geo;rgiaP6werA ~ lDirectorof.NuclearReactor: Regulation ? Attention:Mr. John F.'Stolz, Chief 1 J0perating Reactors Branch No. 4-C . Division of: Licensing 2 >4 AprilL9,1985 -

Page[8-I'

/

~ contacts-are:Used-toxisolate 177 of the approximately 1000 digital ! signals. The only '. mechanism whereby ~ a fault. in the SPDS/ERFDS could affect a Class lE -circuit is contact welding due to n overcurrent. The relay would fail due to inability of the armature to ~ move ion demand..ThisL is not considered credible as discussed 1 i below. %~ It was shown previously that. the maximum voltage from a fault in them SPDS/ERFDS is. 208 volts. -The maximum fault current 'is a momentary surge of 56 amps. I { In'approximately. 57. of the 177 cases, new. Class lE relays (GE Type CR120A and Potter-& Brumfield type KH'4690) were installed as means of ?providing isolation. The, coils 'of new; Class 1E relays were paralleled to existing ' Class J1E-relays, and-~ SPDS/ERFDS circuits l were connected only to normally open output contacts of the new relaps. Welding _of the contact for' the non-Class lE SPDS/ERFDS circuit cannot occur until after the-Class lE circuit has energized to ' perform.'its safetyf functions. No safety-related function would be affected by this failure. e In approximately "120. ofc the 177 cases,- spare output contacts of existingiClass 1E relays (G.E., Type CR120, CR120A, CR105, CR120K 1-and ~ WA,.- AgastatL type. GP and EGP ' Series) were : used as means of providing isolation. -'In'each case the interface.is with an output J j' contact.which is open when ' the ' relay :is in_' its' non-accident state, i

This ensures t that : problems. associated ' with contact. welding and the subsequent ' inability of' the; armature to move cannot occur because

~ of ifaults in the.SPDS/ERFDS circuits.1The only time that contact T welding could ; occur is : in the. event ' of. a~ major' ~ fault in the 'SPDS/ERFDS concurrent-with an: accident signal..'This is, considered . non-credible based on -both Lthe' high reliability. of ' the SFDS/ERFDS 4 .equipmentiand L the very; low. frequency of ' occurrence of an accident e i signal.1 Furthermore, regardless ~. of, the fault 11n: the SPDS/ERFDS, the relay.would move to its accident: state'on demand, and the only consequence lof the welded contacts would 'be; failure of the: relay to 1 reset upon removal of the accident signal. t -m [ f4.- Fuses for Digital Circuits - Fuses are used for' isolation ofl 24'of ~ V ~ c the. approximately M 000. digitali signals ' as described below. .As 1 i

noted previous _ly, - fuses. are, used. to'

isolate Eonly' non-Class 1EL P

circuits. ?ThoseF previously-existing Lnon-Class.'lE 1 circuits:'are

isolated from Class 11E-controlLcircuits' byifuses per the original 1designi ofithe plant.- Fuses are 1 acceptable. isolation fif L they.-

< + '( l s 9 P p + , i . o x 3

- ;= r m; .m.- a w 3 ~ u: 1 r J.,

. ; ~

~ Y = 1GeorgiaPbwer' ( 1 ~ JDirector'of; Nuclear! eactor Regulation R Attention:q Mr.: John F.-Stolz, Chief . Operating Reactors: Branch No. 4 . Division of Licensing c iApril 9,x1985L ~ 3 i-Page 9 .coordindte with upstream fuses.so:that isolating fuses open before the_ safety ' system circuit is.affected. -Fuses are considered acceptable based on the following. ~

In =16. of

the 24 cases, digital inputs to non-Class 1E SPDS/ERFDS circuits;are connected to non-Class IE circuits for the' main steam isolation valves. "The non-Class 1E circuits which are comected to the"SPDS/ERFDS are isolated from. Class 1E MSIV control circuits by _

fuses per.the original design of_ the plant. The fuses are. adequate _ isolation devices in this application because: 1.- The ratio of the ampere rating _ of the isolation fuses and Upstream fuses = is ' 5 ~ to :1.. : Fuse action.should coordinate. A ~ fuse coordination; studyf will confirm this.- We are in process of obtaining time-current curves from the fuse manufacturers. We will adjustafuse sizes "in' the 'unlikely event : of ~1ack of coordination with existing fuses.. '11. BlowingL of the upstream fuse;in the safety related circuit'(there .is no' reason to believe this would occur) would result in only one of the ' two signals ' necessary ' to close the MSIVs.- The circuits ' would' fail in the safe ~ direction. - The' failure would be annunciated tin' the main control. roomL(one-half Group 1 isolation' signal) and _ repairs'could be effected before plant operation was compromised. 'In c 8_ of ~ the. 24 ' casesi digital inputs. to the SPDS/ERFDS-are Leomected to non-Class -1E' control' circuits associated with motor-operated valves-on the p -2 hydrogen recombiner_' system.- The LSPDS/ERFDS? circuits' are -; separated from thei control!. circuits. by . fuses. J The ratioTof. the ampere trating~ of the isolation fuses and upstreamifusesJis: 1.8 H to lwhich should coordinate. ~A fuse. coordination.~ study iwill: confirm ithis. ~ We are in the process of a

obtainingi the - time-current f curves - from L fuse manufacturers.

On receipt' of ithei information, we will, adjust ' fuse ' sizes' in. the - unlikely: event of-lack;of coordination with existing' fuses. - [ ~ We ' conclude, that Class 1E" circuits are adequately isolated by fuses a ccontingent upon.the outcome of La fuse (coordination study.L This study will be complete-. and any. necessary adjustment.of fuse = size 'is' 4 expected..to be.made prior; to the committed completion date for the -, SPDS/ERFDSh, Testing Pis 7 not f required 1 based.on ' coordination' with . upstream fuses.- J 'l s f h 4 s ~" 700119,

y. lGeorgiaPowerN i Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing April.9,'1985 Page 10 5. Control Switches for Digital Circuits - Position status of certain manual control switches used in safety systems are input to the SPDS/ERFDS. The input is wired to a spare contact on the switch ~There is no electrical connection to the safety system circuit. It was shown previously that the ir.aximum voltage from a fault in the SPOS/ERFDS is 208 volts. The maximum fault current is a momentary surge of 56 amps. Isolation by connection to an electrically independent switch _ contact is Leceptable if that contact can safely withstand the maximum credible fault. Suitable isolation is confirmed by the following: 1. . Spare normally open contacts of four (4) electroswitch series 40K manual control switches were used. The switches are rated for 600 volts AC,. 40 amps continuous, and 270 amps overload current. Voltage and overlaod current ratings for these contacts are considerably in excess of the maximum credible fault. ii. Spare normally open contacts of two (2) G.E. S8l nianual control switches were used. The switches are rated 600 volts AC; 20. amps continuous, and 250 amps for 3 seconds. Voltage and overload current ratings' for these contacts are considerably in excess of the maximum credible fault. iii. Spare normally closed contacts of 44 G.E. CR2940 switches were used. -The switches are rated 600 volts AC, 10 amps continuous. No overload current rating is published' for these switches, and the rating could not be obtained from the vendor. However, it has been determined that the switches are adequate based on similarity of the ' design to switches with. published. overcurrent ratings considerably in excess of the maximum surge current from the SPDS/ERFDS.. Also note that.the continuous current rating of tl 2 contacts is more than three times the rating of the 3 amp fast-blow fuse which protectsithe multiplexer.. Following a fault in the SPOS/ERFDS, this fuse would blow to terminate'the fault current and 11solate the contacts. We ' conclude,that Class 1E. circuits are adequately isolated by control: switches, and that specific. testing is' not necessary 'to verify isolation. 700775

( GeorgiaPowerd Director of Nuclear Reactor Regulation Attention:- Mr. John F..Stolz, Chief -Operating Reactors Branch No. 4-Division of Licensing April-9,.1985 Page 11 We believe that, based on the information provided herein, the M C should determine -that suitable electrical and electronic isolation has been provided for the Hatch SPDS/ERFDS systems. Please contact this office if you have any questions or comments. Very truly yours, /C _n_ " " L. T. Gucwa PLS/mb Attachment as stated xc: H. C. Nix, Jr. NRC Regional Administrator Senior Resident Inspector 700M5

ATTAcHMW 1-3 Novrmber 27, 1984 Bechtel Power Corp. 15740 Shady Grove Rd. Gaithersburg, MD 20877-1454 o,O E Attn: Mr. G. A. Kosi 1

Subject:

RiS EI4400 Isolation Syste g & 2 Hatch Nuclear Plant, Unitsw P.O. PEHA-120 RiS S.O. 14231 Gentlemen: This letter and enclosed test report is a follow up to my previous letter of October 25, 1984, and preliminary test report rer;arding the short circuit fault current tests performed on our E14400 isolator modules. Additional testing has been provided as a result of my recent discussion with your Mr. R. Ibach. The results of these tests were again, satis-factory. The test report is being submitted at this time as a final document. We trust that this information is adequate and meets with your approval. Should you have any questions regarding the test report, please feel free to contact me at 716-263-7722. Very truly yours, O ROCHESTER INSTRUMENT SYSTEMS, INC. ~ D

• A hW.ch Donald J. Burgd Sr. Standards E 3eer DJB/kak l

Enclosure cc: R. L. Hanes Rochester Instrument Systems, Inc. 1195 Grimes Bridge Rd. Suite 1 Roswell, GA 30075-3904 R. Buhner Flow Controls, Inc. l 7844 Belair Rd. Baltimore, MD 21236 A. W. Engbrecht - RiSRoc D. J. Wood - RiSRoc ErgaM ]) ROCHESTERINSTRUMENT SYSTEMS,INC.

• • W-E E E. 255 North Urnon Street Rochester New Wrk 14605 U S A.

Telephone:1716 263-7700

• Cadie. RISROCNY. Telex: 978457 I

A member of The Marmon Group of companies i ltronio met 5He

LA 401 FAU1.T CURRENT TEST \\ - OBJECT 13 - To assess the ability of the E144001solator Module to maintain isolation between the IE input and non-1E output during a short circuit fault condition at the output of the module. TEST SET-UP 1. Test set-up will simulate an installation in which the isolator output is a series element in a 3 amp fused circuit powered by a 24VDC power npply. The equipment will be connected as shown in Figure 1. Both relay contacts and associated circuitry will be subjected to the short circuit condition. 2. Test Equipment DVM - Model Fluke 8050A T.E. # Tvo-191 Cal. due date s/gs Scope - Model HP-1727A T.E. # _T0-46 Cal. due date 10/85 Power Supply - AC/DC Electronics, Model EC24N10 Power Supply - Heath / Zenith PSl Rated 24VDC, 10A continuous output PS2 Model SP-2718 3. Precautions should be taken to limit excessive lead lengths between the isolator module output and the power supply. Record lead lengths and wire gauge. Total Length 21" Wire Gauge 12 Cauge Stranded TEST DESCRIPTION 1. Test #1 - Power supply connections are terminated at module pins 6 & 7 (K1C). A. Open SW1 B. Apply 24VDC to module (Pins 6 & 7) C. Close SW1 (siculating the presence of an input signal). Simultaneously measure the waveform on the scope and record the results. The DVM should also be monitored to check the isolation condition. D. Inspect the module for trace or component damage end isolation breakdown. 2. Test // 2 - Power Supply connections are terminated at module pins 7 6 8 (KlD). A. Replace fuse and check that SW1 is in the closed position. B. Apply 24VDC to module (pins 7 & 8). P C. Open SW1. Simultaneously measure the waveform on the scope and record the results. The DVM should also be monitored to check the isolation condition. ROCHESTER INSTRUWENT SYSTEMS 2SS NORTH UNION STREE CHESTER NEW YORK l44 985 KipUNG AVE ( MAIIM RD.,CPMh. TORON WBZ SH4 CANADA h RD,0 AA FORD,lotT DAI 444, u K. TITLE E14401 ISOLATION MODUI.E l SHORT CIRCUlf FAULT CURRENT TEST r app m NL/_ L_ nLt l eure_v 1 ne - /

A +-3g I ' 2< ' Test t 2 - (cont'd) D. Inspect the module for trace or component damage and isolation breakdown. TEhT RESULTS 1. Test # 1 CdRRENTWAVEFORM S4A n 2_64 ITV t8Y t9.9m-S I Swe F.JS E cheSED CPf6 MODULE CONDITION - No evidence of isolation breakdown or trace / component damage was noted. 2. Test # 2 CURRENT WAVEFORM l 5( A l /)'V

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<-88mr+ 4 Y I swg Fest g ruth oftus H0DULE CONDITION - No evidence of isolation breakdown or trace / component damage was noted. ROCHESTER INSTRUMENT SYSTEMS 255 NORTM umON STREE OCHESTER NOW YORK l46' 915 Ki> LING AVE W82 SM4 NMADA MA2iu RD..CAAYD. TORONRD,0 AA FORD.It.MT 0 At 4 l TITLE EI4401 ISOLATION H0DULE SHORT CIRCUIT FAULT CURRENT TEST i I .APPR M. A g d SHEET 2 0F 4

t ,' SUFD'ARY* The preceding tests were performed on an E14401 Isolator Module which is identical to the E14402 module in use at the Hatch f acility, with the exception that the E14401 module es'ntains SPDT relay output circuitry in lieu of a DPDT output. The circuit paths for csch output are comparable; therefore, it is logical that the test results would be j eimilar. The results of these tests indicate that the isolator module will perform its isolation function during the conditions as described in this report. l

REFERENCE:

RiS EI4400 Isolator System Hatch Nuclear Plant, Units 1 & 2 P.O. PERA-120 RiS S.O. 14231 ((b Lf 94 Tested by dc.t.s.,e t i ft { a_ ~ Date / Pf((V/ Approved by e we j)-(TS 0,A.7 Sate t Q ~ q ROCHESTER INSTRUMENT SYSTEMS SK L Av TOR TI) 8 SH4 th 0 b1AIlW RD.,CAAYkRD,0 ART F040,IEEMT 0 At 4M, U.K. T6TLE E14401 ISOLATION H0DULE SHORT CIRCUIT FAULT CURRENT TEST f APPRh 2 /, 4 /,ASHEET 3 0F 4

TEST SET-UP M. Duke P$$ 6e ScoPLe EZ %0 l 2 4 7sa.ma llM h A C DW E RJ h WWS lMS < IMPE L_ I F1 34 Z WD' kioM @h r-54WAL. O ^ i" c s ;; ' ^ so;# SWPPLy g pur ess o 3 Ae FIGURE 1 .a NOTES: 1. C1 added to boost short circuit current. 2. F1 - Littlefuse Series 312; 3A/250V fast acting. 3. Scope across R$ measures waveform. 4. R3 consists of three.1 ohm resistors. Total measured resistance = 0.3058 ohm: (Measurement taken on Fluke 8520A with 4 wire resistance setting). ROCHESTER INSTRUMENT SYSTEMS ux.NfwY[vI."To 8.ab"3.Y.,5'.'a>Wo.?. u". Ns'n

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