ML20213G457

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Responds to Gw Rivenbark 870422 Request for Addl Info Re 870211 Amend Request on 4.16 Kv Emergency Bus Undervoltage Relays
ML20213G457
Person / Time
Site: Hope Creek PSEG icon.png
Issue date: 05/12/1987
From: Corbin McNeil
Public Service Enterprise Group
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NLR-N87082, TAC-64740, NUDOCS 8705180301
Download: ML20213G457 (20)
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{{#Wiki_filter:- _ _ _ _ _ _ _ _ _ _ _ ~ Public Service Electric and Gas Company ' Cortnn A. McNeill, Jr. Public Service Electric and Gas Company P.O. Box 236, Hancocks Bridge, NJ 08038 609 339-4800 s:nict Vice Pres <1ent - Nuclear May 12, 1987 NL R-N8 7082 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen: RESPONSE TO TAC NO. 64740 - REQUEST FOR ADDITIONAL INFORMATION HOPE CREEK GENERATING STATION DOCKET NO. 50-354 Public Service Electric and Gas Company (PSE&G) hereby responds to the letter from George W. Rivenbark (Nuclear Regulatory Commission - NRC) to Corbin A. McNeill, Jr. (PSE&G) dated April 22, 1987 (TAC No. 64740). The information contained in Attachments 1 through 4 completely addresses the NRC Request for Additional Information ( RAI) regarding the Hope Creek Generating Station (HCGS) Technical Specification amendment request dealing with the 4.16 kV Emergency Bus Undervoltage Relays. The subject amendment request was forwarded to the NRC in a letter from C.A. McNeill, Jr. dated February ll, 1987 and hence, this transmittal supplements the original amendment request. Should you have any questions on the subject transmittal, please do not hesitate to contact us. Sincerely, Attachments (4) 8705190301 870512 PDR ADOCK 05000354 p PDR i

Document Control Desk '2 5-12-87 C Mr. G. W. Rivenbark Licensing Project Manager Mr. R. W. Borchardt Senior Resident Inspector i .Mr..D. Caphton USN RC Region I Reviewer Mr. W. T. Russell, Administrator USNRC Region I Mr. D. M. Scott, Chief Bureau of Nuclear Engineering Department of Environmental Protection 380 Scotch Road Trenton, NJ 08628 a 4 l i 4

ATTACHMENT 1 The following information is provided in response to the NRC Request for Additional Information ( RAI) dated April 22, 1987. Each RAI.is reiterated below, and the detailed response follows. This information supplements the PSE&G submittal dated February 17, 1987 regarding the HCGS amendment request dealing with the 4.16 kV Emergency Bus Undervoltage Relays ( Technical Specification Table 3. 3. 3-2). Attachments 2 through 4 contain additional information, as referenced below, which together with this attachment completely address the subject RAI. 1. Provide a comparison of the response characteristics at the desired set point for the inverse time and solid state relays and provide experience data with similar solid state relays in other applications if available. Provide information on reliabilty and qualification to indicate that the solid state relay is -equivalent or better than the inverse time relay. Technical Specification Table 3.3.3-2, Trip Function 5.b specifies an undervoltage trip allowable value of within 20 + 15 - 5 seconds of reaching the degraded condition of 109 volts ( 92 percent). In order to respond within this time frame, the current CV-22 inverse time delay voltage relay is tuned to a Time Dial Setting of 3 - see the characteristic response curve for CV-22 relays in Attachment 2. The CV-22 response curve becomes asymptotic around 92 percent; and therefore, the trip function, in response to a degraded voltage condition, cannot ne accurately predicted nor assured within the allowable time frame. The characteristic response curve for the SSV-T solid state voltage relay is shown in Attachment 3. The use of an SSV-T relay, with an Agastat type E7012PD time delay relay, will satisfy the referenced Technical Specification response time because the SSV-T has a. response time of approximately 35 milliseconds. This time period is essentially instantaneous and when I coupled to a 20 second timer ( the Agastat relay) would produce the required trip function within the specified time l f ra me. Therefore, the comparison of the two response curves in Attachments 2 and 3 concludes that the SSV-T solid state voltage relay will respond quicker and with a higher degree of predictability than the CV-22 inverse time delay voltage relay. PSE&G has found that inverse time delay undervoltage relays i are used at various nuclear facilities, including Limerick -Unit 1 Susquehanna Unit 2 and Trojan Unit 1. The relays in L use at these stations were manuf actured by ITE ( formerly Gould) while the current CV-22 relays at HCGS were manufactured by Westinghouse Electric Corporation ( WEC). l Page 1 of 3 i

In addition, the referenced stations have degraded voltage ranges spanning from 65. percent to 92.5 percent with time delay ranges spanning from less than 3 seconds to 5 minutes. In some cases, more than one relay is used in degraded voltage protection at different voltages with various time delays. Although HCGS falls within these individual ranges, both the degraded voltage and the time delay setpoints must be compared in unison since they are dependent upon each other. When compared to the referenced facilities, the situation at HCGS is unique in the use of a 20 second time delay at 109 volta. With regard to solid state relay experience. PSE&G has been unable to locate another use of the SSV-T relay in a similar situation at other nuclear facilities. However. HCGS has used similar WEC SSV-T relays in the four Emergency Diesel Generator ( EDG) power supply panels as supplied from Colt Industries. To date. no known malfunctions of these relays have been recorded. Although the use of SSV-T relays in the EDG system does not replicate the conditions which will be seen in the undervoltage protection circuit, the solid state relays are qualified for a Class 1E, high radiation, seismic environment. containe the WEC Instruction Hanual, I. L. 41-766.5, which provides additional information on the qualification requirements of the SSV-T relays. Therefore, PSE&G can confirm that the SSV-T relays are environmentally qualified to operate in the expected HCGS environment. In summary, the SSV-T solid state voltage relay provides a more predictable response within the required response time than that for the CV-22 inverse time delay voltage relays as seen from their characteristic response curves. Industry experience for inverse time delay relays is plant specific and hence not applicable to HCGS. Although industry experience for solid state relays is lacking, HCGS is currently utilizing SSV-T relays in the EDG power supply panels with an unblemished record. Finally, the SSV-T relay is completely qualified for the environmental conditions l expected within HCGS. Therefore, the use of a SSV-T solid state voltage relay, in place of the current CV-22 inverse time delay voltage relay, in the 4.16 kV Emergency Bus l Undervoltage trip function is preferred, proven and l justified, i l 2. Provide information to justify your statement that i "since the revised configuration will operate within I the parameters specified in technical specifications, l the system reliability will be increased. " This is not clear since the inverse time relays operate within the same parameters. Page 2 of 3 l l

PSE&G concurs that the requirements identified in Technical Specification Table 3.3.3-2 for Trip Function 5.b for the current inverse time delay voltage relay will also be imposed on the proposed solid state voltage relay, i. e. 20 + 15. 5 seconds at 109.0 volts. However, as can be seen when comparing the characteristic response curves in Attachments 2 and 3, the SSV-T relay will operate in a more predictable manner due to the asymtotical response of the CV-22 relay at a degraded voltage of around 92 percent. The i more linear nature of the SSV-T relay curves combined with a an almost instantaneous response channeled to a preset 20 second timer ensures the 4.16 kV system will respond to trip conditions with a higher degree of reliability. Additionally, solid state components when compared to electro-mechanical components are more reliable since less physical motion and cyclic stresses are involved. This conclusion assumes the solid state component is capable of operating within the same environment as the electro - mechanical component and, in the case of the subject relays, is verified as described in the response to RAI No. 1 above. Since the SSV-T relay is a solid state relay and meets the environmental requirements specified, it can also be concluded from purely a component design basis that the SSV-T solid state voltage relay will be more reliable when i compared to the CV-22 inverse time delay voltage relay. 3. Provide information to justify that technical specification surveillance requirements specified for the inverse time relays are still valid for the solid state relays. HCGS is required to perform the Class 1 E, 4.16 kV feeder, degraded voltage instrumentation channel functional test (Test Procedure MD-ST. PB-005( Q) ) on at least a monthly basis per Technical Specification Table 4.3.3.1-1 Trip Function

5. b.

The test ensures that the entire channel is tested and includes the injection of a simulated signal to assure operability, including alarm and trip functions. As detailed in Attachment 4 SSV-T relays should be checked at j least once every year. Since the Surveillance Requirements contained in the Technical Specifications are not changing and because the testing which will be performed is more conservative than that recommended by WEC, the functional tests currently performed on the CV-22 relays to demonstrate l operability will still be valid when performed on the SSV-T

relays, i

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~ ' TYPE CV RELAY ATTACHMENT 2 32 TYPICAL TIME CURVES ' r Em n } ],'l TYPE CV J :11 UNDER VOLTAGE RELAY ll 30 60 HERTZ i d II - 1 EI I . EI I I J ny i gg i ) I Il f 1 !I III I I J f [ f ly ) 3 i I i Jf ' fW h r I l II If i gg i i n. 1 # I I I i ' i ' i i I,'j J I I i i ! i e !Ej L1 I f iL II I E I ' i 1!I I I Ii gy i Il f I' 11 E I. !I .Ji J J 'I I r j g_ j r I IIITI J SS I II I I J I FIJ I f I I J 'Ii I.I f Ji ] I I :I J V l'l t f Y I E'I V ' I' gg i I I! E I_J IiJ ! !3 I f ie a t i rI;f ile 1I J. fi1 ei i I I II i I 6 * 'f If E!I I I I TI ., I i. I I i I y I IJ I J I I I J I .i i l i 8 ' I i 'I I E' 'I!, gg 1 i e i i Ii II ;Fl IfJ f le f 1 I ! 3 l' / TI II 311 j f i e !i t 1 I/ iII / / I.f I J t. I ! '/ I: I I II . I. 1 i W i }$ $ I /*I fr I I J ul! E 1 !J' t II J l JiI fi Fl I o i E !J ff f !) !f I l '?, f f I il '. r i1! I ', [] (J W A in 2'i / J Il1 'J FJ f f f J l f V F 'I I TR }Q I / IJ fi / / / I T / f f I/ J I 1 I T 1 TIMd OfAl, SETTING e e e i e r .r r c i (i If ~fT' / / / V 1 1 I J I l t 1 f ! l ggr i / / Jr x ,r r I I J gg i f i 1'Q~ ,10 ~ l I / i ./' / / / f .f I l 13 _ i i i ie / II.r i s'. / I J J E / I / f I E F %"* S T LLL' 'e 1~. w ^ /i 't 1 1 I Y . u fi r! 1 f 1 / r .r .n gg g h_. i t!I Iea v i r 't / / J iI ,e I ii I d M / r f ill I MiI M ~~~.T I r J I _.i I (~ d / / .I F df ~~.O e e r r i TI TT !i!I e g LLLi e-#K . --L,'*C-~1 5 'i r r / J f A i. I F iII II i -*-~ r 2 l i / / F 1s

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~~~# ATTACHMENT 4 ~ Westinghouss I t d17se s INSTALLATION e SPERATION e MAINTENANCE INSTRUCTIONS ) ) TYPES SSV-T AND SSC-T RELAYS (For Class IE Application) CAUTION: Before putting relays into service. The type SSC-T and SSV-T relays have a remove all blocking which may have been inserted high ratio of drop-out and are particularly for the purpose of securing the parts daring ship-suitable for use in applications requiring as ment. Make sure that all moving parts operate accurate current or voltage level detector. freely. Inspect the contacts to see that they are clean and close property, and operate the relay CONSTRUCTION to check the settings and electrical connections. l The type SSC-T or SSV-T relay consists of APPLICATION a printed circuit board with a transformer, a scale l plate, an output telephone relay, and several These relays have been speciaHy des.igned and associated components. The relay is mounted is 1 tested to establish their suitabdity for Class IE se semi-Amh FT Il Fhiten cue. The relay applications. Materials have been selected and sis 6 includes one ICS Ondicating Contactor ] tened to insure sat se misys a perfoms esir Switch) for indication and seal.in purposes. mtended function for esir design Efe when The relay chassis is draw-out construction for operated,s a normal environment as def'med by easy of test and maintenance. i J g /g ANSI standard C37.90 - 1971, when esposed 8' ) to radiation levels up to 10' reds, and when sub-The coenponents are connected as shown in jected to semenc mets produces a Shock Fig. 4. 5. and 6. Response Spectrum within the limits of the relay '*""8-Input Transformer - The input transformer l " Class IE" is the safety classification of the is a two winding type with a center tapped I electric equipment and systems in nuclear power secondary winding. The secondary is connected i generating stations that are essential to emergene) to too full wave rectifiers. shutdown of the reactor, containanent isolation. cooling of the reactor, and heat removal from Rectifiers and DC Power Supply - There are the containment and reactor, or otherwise are two full wave rcctifiers. One with two asner essential in preventing significant release of diodes and a capacitor is used as an input signal radioactive material to the environment. and connected to a level detector (settingi circuit. d" * * * * "d ** '"'8' P' ** The solid state' types SSC-T current relav ti ns. The other full wave rectifier is used as de and SSV.T soltage relay are high seismic rels[s power supply. For type SSC-T overcurrent relay. and'suiinte for nuclear power staion relasitIs E protection. Thes are adjustable over a wide range }* of current and" soltage and have a calieratec Rate plate which indicates the pick.up setting. Setting Circuit - The setting circuit is con-The output unit is a telephone relay and an ICS nested between zener-rectifier and sensing circuit. (Indicating Contactor Switch) seal in device. lP r....Re..ontenrenere which mas ari.e Jurmy installatwn. creration. or maintenance. nn /* *:,rther J..;...; rJ wri.:t;.. :. at t tis equironent Ja ur, t (:.rro :.. be.m ered b.s these.nstes.ctinent i r il i i r m.tintenans e of ) .no.ornratu.n s. Je.rcJ b;. purs ha<er regarJmg has par::.:dar m<ta at on operat on u d gr.o.g..ornte t asfestinghottse Electerc Corporatio*r representatuse shonJd be conta.te b EIVI MM EFFECTIVE NOVEMBER 1977 J.' DRAEATI IT V1 h F0fDNF0fAUDON m/ L. l w Ed ,g i A.,.

o. s For undervoltage application, the transistors It consists of two resistors and a potentiometer with a scale plate. The potentiometer has a Qi and Q2 are normally conducting and the locking feature to minimize accidential change telephone relay is pulled in. As soon as the input voltage drops below the setting, the transistor of setting. Q2 is turned off and the telephone relay is re. Sensing Circuit - The sensing circuit consists leased. of a transistor, a mener diode, and several assoc > sted components. It is actually a level detector. CHARACTERISTICS If the input voltage from the rectifier is high enough to break down the asner diode, the output transistor will be turned on. I. Overcurrent Relay SSC-T Output circuit - The output circuit consists I of a transistor driver and a telephone relay. The Range Continuous Rating overcurrent relay (SSC-T) has a telephone relay equipped with 2.A type contacts. The over of 0.5 - 2 amps 2 amps under voltage relay (SSV-T) has a telephone relay equipped with I-A & I B type contacts. 2.0 - 8 amps 8 amps Indicating Contactor Switch (ICS) - The In-4.0 - 16 amps 10 amps dicating contactor switch is a small de operated clapper type device. A magnetic armature to 10 - 40 amps 10 amps which leaf spring mounted contacts are attached. It is attracted tp the magnetic core upon energiz. ation of the switch. When the switch closes the I Second Rating: 28 times the continuous moving contracts bridge two stationary' contacts rating. completing the trip circuit. Also during this operation, two fingers on the armature deflect Operating Frequency 50/60 Hz a spring located on the front of the switch which allows the target to drop. The target is reset Temperature Error. 29 between - 20*C and from the outside of the case by a push rod located 659C. l st the bottom of the cover. Dropout Ratio: 909 to 98% OPERATION The block diagrams of the SSV T and SSC-T are shown in Fig. l. 2, and 3 and the internal Response Time: Pickup Time = 10 - 13 r:is l schematic are shown in. Fig. 4. 5. and 6. For osenoltage and osercurrent application. the Dropout Time = 10 - 26 ms transistor Q2 is normally not conducting and the telephone relay is deenergized. The transistor QI is used as an emitter follower. When ac voltage [ or current is applied to the primary of the trans-For 2 tal5 times pickup former (Tl a voltage is produced on the secondary setting value (Fig.10n <ide that is proportional to the input. The retentiometer tR2n is for the pick.up setting. If Tranudent Oserreach: F tne.altage from rectifier iZl. Z2. and C2n is la.ge enough to esceed the breakdown voltage iTab;e ls Burden ot' ce,cr dusle Z5. the zener diode conducts to l l turn on the transistor Q2 and operate the I telephone relay. Frequene) Response: iFig.121 7' l 2 h WL,.. .N '

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n ,.......s... 0^ll bfy Gk rrf 4 9 'g lT = e bu) 7tz -6 7o o lO LL 81*I8*3 k ) relay. Setting in between the scale marking can TABLEl(Sc hertz). be made by applying the desired voltage or current i N ./ and adjusting the potentiometer until the tele-Piste,cument setung P one relav operates, h l nonostasape) Lemost Segung SGehestesehe _ va p.r.ansioy va p.r.ane e #~ INSTALLATION s o.s - 2.o o.s s.s* 4.o s2.s. 2.o - s.o o.s sJ-sm 12.5-The relays should be mounted on switchboard as-is.o e.s s.s-ss 12.s. pancis or their equivalent in a location free from too - soo o.s to na eo ser dirt, moisture, excessive vibration and heat. Mount the relay vertically by means of the four

2. Over/Under voltage Relay SSV-T.

mounting holes on the flange for the semi flush type FT case. The mountir.g screws may be uti-Range: 60 -140 Volts lized for grounding the relay. External toothed p is 140 - 320 Volts washers inre provided for use in the locations c.., 280 - 640 Volts shown on the outline and drilling plan to facilitate making a good electrical connection between the relay case, ks mounting semws and the my Continuous Rating: Highestvoltage of range panel. Ground Wires are affixed to the mounting i ""*"8 ' screws as required for poorly grounded or insula. ting Panels. Other electrical connections may be ^ F W60 h made directly to the terminals by means of screws, I ""**I '"*I "'""'I"8-P ) Temperature Error: 2% between -20*C and For detail information on the FT case refer to I.L. 41076 for semi flush mounting. 92% to 99%. Dropout Ratio: an 1L. wM ADJUSTMENT AND MAINTENANCE ResponseTime: Pickap Time 10 ms The proper adjustments to insure correct operation of this relay have been made at the Dropout Time 40 factory and should not be disturbed after receipt as (Fig.9) by the customer. Burden: 1 VA at 120 volts 60 hertz Acceptance Teses: The foHowing cpeck is mconintendd to Trip Circuit insure that the relay as in proper working order. Refer to the internal schematics and apply tolt-The main contacts will safely close 30 amperes l .it 250 solts de and the sealin contacts of the in-age or current to the proper terminals. I. %Iinimum Trip Current - Cheek pickup dicating contactor switch (when suppliedi will minimum and maximum settings This is, Safely carry this current long enough to trip a accomplished by applying the specified toltage at circuit breaker. The indicating contactor switch or current and checking the pickup of the output twhen supplied) has a pickup of approximatel) telephone relay when the ac input is within 15P c I ampere. Its de resistance is 0.37 ohms. of the wttings. SETTINGS: 2 Dropout Ratio - Ader e5:ekirg pi: Lap. gradually reduce the ins The drgoat r.euM O The rela) must be 5et for the desired iesci, of be greater than 9:4 and # of the pi:Lp for ) soltage or current. The pickup of the rela) is made {SLT and SSC T relays re>pectisely. l by adjusting the potentiometer in the front of the FOR INF0%TM ONL,i. ! l g

a i / 'I Repeat above cacept to pass 85% of ICS I. Contact Wipe - Adjust the stationary nameplate rating current. Contacts should not contacts so that both stationary make with the pick up and target should not drop. moving contacts simultaneously and wipe I/64" ~' ROUTINE MAINTENCE uble trip ICS units, adjust the third r All relays' calibration should be checked and "*. "*U

  • contacts should be cleaned at least once every year. A contact burnisher Sil82A836H01 is

,p to recommended for cleaning purpose. It is recom-mended to change the potentiomenter R2 every

2. Taract - Manually. raise the moving contacts and check to see that the target drops I'" Y**'*-

at the same time as the contacts made or up to CALIBRATION I/16" ahead. The cover may be removed and the tab holding the target reformed slightly if Use the follow.mg procedure for calibratmg necessary. However care should be exercised so the relay if the relay adjustments have been dis-that the target will not drop with a slight jar. trubed. This procedure should not be used until it is apparent that the relay is not in proper

3. Pickup - Uni'. should pickup at 98% of work,ing order. A new acale plate may be nec-rating and not pickup at 85% of rating. If nec-essan when parts are changed.

essary the cover leaf springs may be adjusted. To lower the pickup current use a tweezer or Dial Calibrat. ion - 1. Connect on ohmmeter similar tool and squeeze each leaf spring appromi-across proper relay terminals which connect to mate equal by applying the tweczer between the the telephone relay contacts. leaf spring and the front surface of the cover at

2. Apply the desared voltage or current to relay the bottom of the lower window.

l terminals 8 and 9. l

3. Turn potentiometer on front of relay counter-If the pickup is low the front cover must be clockwtse from extreme clockwise position until removed and the leaf spring bent outward equally.

the relay operates as indicated by the ohmmeter. ~ Indicating Costactor Switch IICS) Repair work can be done most satisfactorily Initially adjust unit on the pedestal.so that at the factory. However, interchangeable parts armature fingers do not touch the yoke in the can be furnished to customers who are equipped reset position. This can be done by loosening the for doing repair work. When ordering parts. mounting screw in the molded pedestal and alwa3s give the complete nameplate data. l moving the ICS in the downward position. l l l t l l l l 1 l FOR lhF0fWATW CM.f.. i

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OUTLINE AND DRILLING FOR RELAY CASE TYPE. FT-Il FOR CLASS l-E APPLICATION --.sss (44.308 L594 - P4,083* g (40.4s) 3:54003 f.'!?<A% s n a 1 q.8 -Les e' too sel $ $ "gg PANEL LOCAfl008 stess-FLuSn asts. ~ * ' - p5.W3* 250 4 MOLES F0ft 8 88*38 "I 8C'E"8 ~ 2.7W- = ='. -ca.c <=.a i. .WfTERNAL gjy5 J l I a a g i exmum. eens $38 3.250 1enSHER l 2. /j- & (74 4 I t . Mt.SSI ' ' l f 4 dr. ii./ 9 ( A,,,. =.3.c a s, $" car W 75-*i IIW (14s.35 PANEL CUTOUT S ORtLUNG FOR SEMI-FLUSH MTS. 3StGat$. I p.y s2 ourm end Orunong Peen for roe Tree S$v.T ana $$C." Hay so Sen!!use U tt Case W ESTIN G H O U S E ELECTRIC CO RP O R ATIO N RELAY.lMSTRUMENT DIVISION Ja NEWARM, N. J. Pt.eesese U 1 A. s 4,.. .g.

I SSV-T RELAYS'De sT CASE Ol321D79A01 ge[al Parte 60-140 VOLTS 50/60 HZ. 1 AMP ICS UNIT SID 9'l'l b* CLASS I-E i,a \\W g, dF The failmeine parts are most subject to wear in ordinary :::st-%:. leentinsumen Nummer NameetPtut Number perUnit _ 1451C82G01 1 MODULE 3523A56G13 1 ICS UNIT 288B744Gil 1 COIL STA. CONTACT FOR ICS UNIT 1732868 2 187774 1 COVER COMPLETE 2 187A744H01 1 KNOB

  • l FOR FT CASE PARTS REFER TO RPD 41-076Al 1

l 6 man: rene - in.e.eos in me w.er.nimi me, m. Oreer past by numo and idonenentsen n.n. J -_ eengeses nemmedede rendes. WeeHaghouse Electric Cetpetelles Paes OM I f je. .,jl/ u.g (U-r01 INFbmATW om.Y.. ht.. .,}}

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