ML20205P823
| ML20205P823 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 05/20/1986 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Noonan V Office of Nuclear Reactor Regulation |
| References | |
| SBN-1057, NUDOCS 8605220050 | |
| Download: ML20205P823 (14) | |
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a SEABROOK STATION Engineering Office PEN 4 May 20, 1986 Pub 5c Service of New Hampshire SBN-1057 T.F.
B7.1.2 NEW HAMPSHIRE YANKEE DIVISION United States Nuclear Regulatory Commission Washington, DC 20555 httention:
Mr. Vincent S. Noonan, Project Director PWR Project Directorate No. 5
Reference:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) PSNH Letter (SBN-903), dated November 27, 1985,
" Resolution of Power Systems Branch Confirmatory Items", J. DeVincentis to G. W. Knighton (c) PSE&G Letter, dated November 22, 1985, "HCGS Con-firmatory Issue 17 - Isolation Devices, Hope Creek Generating Station", R. L. Mitti to W. Butler Subj ect :
Additional Information on Isolation Cabinet MM-CP-470 (SER Confirmatory Issue No. 25)
Dear Sir:
As a result of discussions with the Staff (ICSB and PSB), additional information was requested concerning the qualification of isolation cabinet MM-CP-470 which is used to provide isolation between Train A and Train B circuits. The following information responds to the Staff's requests and augments the information already submitted to the Staf f via Reference (b)
[ Confirmatory item C-25, Items 6, 7, 8 and 13].
The additional information pertains to the Maximum Credible Voltage Test and Short-Circuit Current Test of the Struthers-Dunn type 219 isolation relay used in the subject isolation cabinet.
Although these two specific tests were not part of the qualification program for the Seabrook isolation cabinet, we have obtained a test report on the Struthers-Dunn type 219 isolation relays performed by Wyle Labs for Hope Creek (Public Service Electric and Gas Co.,
Docket 50-354) which addresses the above two specific tests.
This test report (Wyle Test Report No. 47950-01) was submitted to the NRC by PSE&G [ Reference (c)]. The acceptance of the report is documented in Hope Creek's SSER 5, Section 7.2.2.5(5) provided herewith (Attachment 1).
0605220050 860520 PDR ADOCK 05000443
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Seabrook Station Construction Field Offica. P.O. Box 700. Seabrook, NH O3874
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l United States Nuclear Regulatory Commission Attention:
Mr. Vincent S. Noonan Page 2 The tested relays for Hope Creek are Struthers-Dunn 120 Vac, type 219XBXP.
The relays used for the Seabrook isolation cabinet MM-CP-470 are Struthers-Dunn, 120 Vac' type 219XBX234. The two relay types are basically the.same. The only difference being that the 219XBXP is a standard relay while the 219XBX234 is an improved special relay wired the same as the standard but having the contacts constructed in such a way as to keep them as f ar removed from the frame as pos-sible' for better isolation and utilizing a special flame retardant bearing pad.
Mme above is documented in correspondence between Struthers-Dunn Co. and Yankee Atomic Electric Company (see Attachment 2).
As _ documented in the test report, the Maximum Credible Voltage Test con-sisted of applying 300 V RMS for 5 minutes between circuits (coil terminals and contacts) and across normally open contacts.. The maximum credible voltage appli-cable to the Seabrook circuits utilizing the isolation cabinet is 140 volts.which is enveloped by the 300 volts test level;- therefore, we consider the results of the test report applicable to Seabrook.
The Short Circuit Current Test consisted of applying a minimum of 325 amps through the closed contacts of the isolation relays until an open circuit occurred.
The maximum credible short. circuit current applicable to the Seabrook circtits utilizing the isolation cabinet is 240 amps which is enveloped by the 325 amps test level; therefore, we consider the results of the test report applicable te Seabrook.
Based on the above, we consider the test report for the Hope Creek Struthet s-Dunn isolation relays to be applicable to the Struthers-Dunn relays used for tho Seabrook isolation cabinet MM-CP-470.
The circuits utilizing the isolation cabinet to date are listed in Attach-ment 3.
We trust that the enclosed is acceptable and request that the resolution of the above referenced confirmatory issue be reflected in the next supplement.
to Seabrook's SER.
Very truly yours, A
ohn DeVincentis Director of Engineering Attachments cc: Atomic Safety and Licensing Board Service List 1
Dicn3 Curren, Esquire Calvin A. Cennsg Hanson & Weiss City Manager 2001 S. Street, N.W.
City Hall suite 430 126 Daniel Street Portsmouth, NH 03801 Washington, D.C.
20009 Sherwin E. Turk, Esq.
Stephen E. Morelli, Esquire Office of the Executive Legal Director Attorney General U.S. Nuclear Regulatory Comunission George Dana Bisbee, Esquire Tenth Floor Assistant Attorney General Washington, DC 20555 office of the Attorney General 25 Capitol Street Robert A. Backus Esquire Concord, NH 03301--6397 116 Lowell Street P.O. Box 516 Nr. J. P. Eadeau Manchester, NH 03105 Selectmen's Office 10 Central Road Philip Ahrens, Esquire Rye, NH 03870 Assistant Attoniey General Department of The Attorney General Mr. Angle Nachiros Statehouse Station M Chairman of the Board of Selectmen kugusta. NE 04333 Town of Newbury Newbury, MA 01950 Mrs. Sandra Cavutis Chairman, Board of Selectmer.
Mr. William 8. Lord RFD 1 - Box 1154 Board of Selectmen Rennsington, NH 03827 Town Hall - Friend Street Amesbury, MA 01913 Carol S. Sneider, Esquire Assistant Attorney General Senator Gordon J. Humphrey Department of the Attorney General 1 Pillsbury Street One Ashburton Place, 19th Floor Concord, NH 03301 Boston, MA 02108 (ATTN: Herb Boynton)
Senator Gordon J. Humphrey H. Joseph Flynn, Esquire U.S. Senate Office of General Counsel Washington, DC 20510 Federal Emergency Management Agencyg i
(ATTN: Tom Burack) 500 C Street, SW Washington, DC 20472 Richard A. Hampe, Esq.
Hampe and McNicholas Paul McEachern. Esquire 35 Pleasant Street Matthew T. Brock, Esquire Concord, NH 03301 Shaines & McEachern 25 Naplewood Avenue Donald E. Chick P.O. Box 360 Town Manager Portsmouth, NH 03801 T wn of Exeter 10 Front Street Cary W. Holmes, Esq.
Exeter, NH 03833 Holmes & Ells 47 Winnacunnet Road Brentwood Board of Selectmen Hampton, NH 03841 R.FD Dalton Road Brentwood, NH 03833 Nr. Ed Thomas FEMA Jtegion I Peter J. Nathews, Mayor 442 John W. McCormack PO & Courthouse City Hall Boston, MA 02109 Newburyport, MA 01950 Stanley W. Knowles, Chainnan Board of Selectmen P.O. Box 710 North Hampton, NH 03862 P
g ssN-1057 ATTACHMENT 1 HOPE CREEK SER
~ t er.;
h 7 INSTRUMENTATION AND CONTROLS
- 7. 2 Reactor Protection (Trip) system 7.2.2 Specific Findings 7.2.2.4 Lifting of Leads to Perform Surveillance Testing As stated in the SER, the aDolicant had performed an evaluation, at the.. staff's request, to determine whether the Hope Creek design had the canability.o per-form surveillance testing without lifting leads or utilizing jumpers.
This evaluation did not identify any device or circuit bypassing method other than those permitted by Position C 5 of RG 1.118. On the basis of the results of its original review, the NRC staff had found the actions requ4 rad to parform surveillance testing acceptable.
However, by letter dated February 24, 1986 (C. A. McNeill, PSE&G, to E. Acensam, NRC), the applicant identified the need to utilize lifted leans and.iumpers for certain at power surveillance testing.
The applicant indicated that, with these certain exceptions related to the use of temporary alterations during the par-formance of required at power surveillance tests, the Hope Creek design is in compliance witn RG 1.118.
(.
For each exception where teeoorary alterations are required (e g., lifting leads and jumpers), the applicant nas committed to follow the guidance in Office of Inspection and Enforcement (IE) Information Notice 84-37, "lise of Lifted Leads and Jumpers During Maintenance or Surveillance Testing." IE Information Notice 84-37 recommends a combination of administrative controls and functional tests to verify the restoration of proper system configuration following surveillance tests.,
On the basis of the results of its review, the NRC staff finds the applicant's commitment to follow the guidance of IE Information Notice 84-37 acceptat:1e.
This will provide reasonable assurance that the instrumentation will be re-stored to the correct configuration.following surveillance testing where lifted leads anc jumpers are needed.
Therefore, the NRC staff finds the actions re-quireo acceptable.
7.2.2.5 Isolation Devices In the SER the staff identified a concern about the ; solation oevices that are l
used to maintain independence between radundant Class IE circuits and between Class IE and non-Class IE circuits.
Specifically, for the isolation devices usec, the staff requested data regarding (1) the maximum credible fault (MCF) voltage / current (2) application of the MCF in the transverse mode to the output of the isolator (3) test procedures
(.
(4) test results Hope Creek SSER 5 7-1
(.-
d In responen to the staff's recuest, the applicant sut:mitted data describing each
{I of the dif9erent' types of isolators used and tnetr qualifications as a Class 1E isolating device. The iso'ation oevices used at Hope Creek are (1) Validyne Multiplexers and Bailey Controls 890 System The Validyne multiplexers (used between redundant Class 1E and Class 1E and non-Class 1E equipment) and the Bailey centrols 890 system (used between Class 1E and non-Class IE aquipmer.t) using transmitters and re-cefvers are qualified Class 1E equipment.
The Validyne system uses fiber-optic cables to intarface between redundant Class IE systees and Class 1E to non-Class 16 systems. The Bailey 890 system uses fiberontic cables to intsrfacebetweetsClass1EandA66-Classilsystems.
The fiberoptic cable in this case is the isolator because it will not permit the propagation of the MCF free one end of the cable to the other end.
Fiberoptic cables have ths following properties that qualify them as ideal isolators:
(a) They are totally dielectric; therefore, the electrical fault voltage /
current cannot propagate from one and of the cable to the other end.
(b) They are not susceptible to electrical interference.
Electrical noise, such as electrostatic coupling, common mode, or crosstalk, cannot be induced into or propagate througn the cable.
(2) The Computer Products. Inc.. Transformer Coupled Moden TheComputerProducts,Inc.b)isolaterisatransformercoupledmultidrop limited distance modem ( El The isolation interface is the output transformer on the non-Class 1E side The system is qualified in accor-dance with Standards 344-1975 and 472-1975 of the Institute of Electrical and Electronics Engineers (IEEE) and is locaten in a mild environment.
The MCF was applied to the ELDM in two chases.
Phase I* applied 300 V ac peak to peak, which is in excess of the calculated MCF voltage of 140 V ac.
Phase 11 applied an instantaneous short circuit current of approximately 385 amps.
The current was applied using 204 V ac with a 15-amp circuit breaker. The MCF in both phases was applied to the non-Class IE cutput j
side of the M LDM in the transverse mode.
The acceptance criterion states that no MCF voltage / current applied to the non-Class 1E side shall cause any misoperations on the Class IE side.
The acceptance critarfon was set by inserting a program inte.he system and, after the test, verifying that the program was still operational and tne same program that was entered before t,he test.
(3)
Technoloav for Eneray Corporation (TEC) Model 15o The TEC Model 155 analog signal isolator is a $1ngle channel current or voltage sensing device, which can be configured to accoot a variety of input ranges.
The unit is powered by 24 V de furnished from the catput side of the module.
Power isolation is providea between tne input and
{
output side of the :ard.
The connections,for the input and output are Hope Creek SSER 5 7-2 f
located on barrier strips to provide physical separation.
Signal isola-(f.
tion is achieved by the use of a eagnetic field :arrying information across an electrically isolatec barrier.
The isolators are cualified to IEEE Stds. 323-1974 and 344-1975 and are located in and qualified for a mild environment.
The MCF voltage / current used was 170 volts root mean square (VRMS) at 20 emps. The MCF was applied to the non-Class 1E cutout side of the iso-lator in the transvarse mode. The Class 1E input side of the isolator was acnitored using an oscillograph recorder. Upon the abrupt application of the MCF, the oscillograph recording showed no change in the input circuit.
The acceptance criterion that the integ*ity and the isolation ability of the Class IE input be maintained was met irrespective of the fact tnat the output circuit was damaged and no longer functioned.
The units tested were the potted version of the TEC 156 analog isolator.
TEC mkos and distributes an ucpotted version in which the unit's components are eccessible. With ths potted units, it was not possible to determine the nature of the failure of the output. The unit :entains 1/8-amp fuses on its output, and it can only be surmised that the fuses opened, thereby aborting the fault. However, by virtue of the potting, snare is no credi-ble manner in which the fuses can be compromised and the units stl11 oper-ate.
If and when the output fails, the units must be taken out of the circuit and replaced with new ones.
In discussions with the applicant, the applicant ensured the staff that the pctted versions of tne TEC 156 analog isolator were the only models in service at the plant.
(4) (.A Technoloaies Inc. RM-60 System The GA Technologies Inc. RM-80 system is the basis for the iiope Creek digi-tal radiation monitoring system (DRMS).
The system is a microprocessor-based computer-controlled s The system consists of Class 1E and non-Ciass1ERM-80 modules (ystem. field), Class 1E RM-23 cosouters (fie non-Class 1E'AM-11 computers (control room).
The system uses two diffe mnt types of isolators:
the communication iso-lation (CI) device and the ODC-24 optical isolator..The CI device is used to provide isolation between the RM-80s and the RM-11.
Tne 00C-24 provides isolation between the RM-23s and non-Class IE circuits.
The two isolators are qualified to IEEE Std. 344-1975 and tested in accordance with IEEE Std. 472-1974. The isolators are lecated in and qualifica for a alld i
environment.
The acceptance criteriori states that the isolation oevica nerformance shall be deemed acceptable when the signals transmitteo between the RM-23A, the remote indicator and control module, and the RM-80 microp mcassor remain unchanged during and after the tests outlined in the procedure, thus demon-strating that fdvits on one side of the isolation device ce not cause anty j
alsoperations on the other side of the device. The tests conducted were an
- open c.ircuit, a short circuit, a line to ground fault, anc the MCF voltage /
current app 1ted in the transverse mode to the non-Class 1E output side of the isolators.
In additien, a surge withstand est was perfomed on the 00C-24 isolator. The MCF voltage / current was determined i.o be~ 165 VRMS at
- (
30 amps.
Hope Creek SSER 5 7-3
On tne application of the MCF voltage / current to the non-Class 1E output side of the isolators in the transverse mode, the class IE input side was Addt-not affacted by selfunctions on the output side caused by the MCF.
tional testing of the RM-80 system components (except the 00C-24) for elec-tromagnetic capability was perfomed at the vendor s facilities to ensure that the radiation monitors would function properly under electromagnetic interference (EMI) conditions.
These tests included conducted anc radiatea transients (100 to 500 kHz, 300-V peak-to peak amp 14 tune), conducted and radiated radio frequency (RF) transients (0.5 to 100 Mhz, 5-V peak-to peak amplitude), and voltage surges consisting of a 2.5-kV peak oscillatory wave at a frequency of 1.5 Miz. The acceptance criterion was set.
(5) Allen-Bradley 700-200 A12P. Struthers-Dunn Type 219. Acastat GP nnd Potter and Brumfielo palm Relays The auxiliary relays used at Hope Creek 'or isolation devices are (a) Agastat Type GP, Model EGP-8001 (b) Allen-Bradley (A8) Type P, Model 700-P200A1 (c) Potter and Brumfield (8&P) Type MDR, Model 4134-1 (d) Struthers-Dunn (50) Models 219X8XP and 2198CXP The relays were tested to determine the ability or their coils Class 1E side, to maintain continuity and operability when their contacts, non-Class 1Eside,weresubjectedtovarioustestsincludingtheMCFvoltage/ current The relays when applied to the outaut contacts in the transverse mode.
were subjected to a hip potential dielectric test, a surge withstand capability test, a max. mum credible voltage test, and a maximum credible e
short circuit cut ent test.
i The tests are described as follows:
Hinh Datent'tal Dielectric Tes_t - application of a 1500-V octential for 60 sec between insulation aria ground, between relay coil and con-I tacts, and across normally open relay contacts Surne Withstand Canability Test - application of a 2.5-kV,1.0-HHz surge wave for 2 see between relay coil and contacts, across normally I
open telty contacts, and between contacts with tne coil energized with rated voltage Maxie? Credible Voltaae Test - application of the voitages listed below for a duration of 5 min between the relay coil and contacts l
Relay Voltage Allen-Bradley 650 V Agastat 164 V Potter and Brumfield 650 V Struthers-Dunn 300 V Maximue Credible Short Circuit Current Test - app 11 cation of a short c rcuit current, as listed below for each specimen, througn the closed contacts of the energized specimen relay until an open circuit occurred A
Hope Creek SSER 5 7-4
Relay Current Allen-Bradley 1160 and 1177 anos Agastat 300 amps Potter and Brumfield 300 amps Struthers-Dunn 300-350 anos The acceptance criteria for the aoove tests are:
High potential Dieluctric Test - There shall be no evidence of insula-tion breakdown or T ashover w"th the applied potentiai during the high potential functional test.
Leakage current shall be less than 3 mA between circuits and across normally open contacts.
Surne Withstand Caonbility Test - There shall be no evidence of insula-tion breakdown or T' asnover with an applied potentia 1 per ANSI /IEEE Std. C37.90-1978. Paragraph 9.3, and IEEE Std. 472-1574 Paragraph 2.
Maximum Credible Voltam Test - There shall be no evidence of insula-tion breakdown or flas wver on the ll lass 1E stee or coil at the relay.
Meximus Creati_ble Short Circuit Current Test - The integrity of the relay coil connected to class IE power shall be maintained when a short circuit current is circulated through the associated relay con-tacts (used in non-Class 1E circuits).
After each test, a post-test functional test was performed on the test specimen. In all cases the relays demonstrated sufficient integrity to maintain their Class 1E function and meet the acceptance criteria given e
above.
(6) General Electric (GE) Optical Isolators The GE optien1 isolator as an isolation device is discussed in GE recorts l
EAJ04-98, Revision 0, and A000-794-21, Revision 1, and accepted oy tne staff for use at the River Band station, Docket No. 50-458 After a detailed review of the materials and data submitted by the applicant, including the changes to the Hope Creek F5AR as envered by the answer to Q421.13, Amendment 7 appitcantarequalifIedisolationdevices.the staff has concluded that the devices used by This resolves the concerns of SER Section 7.2.2.6 and Confinnatory Item 17, 7.2.2.7 Regulatory Guide 1.75 As discussed in the SER, a concern deveicped regarding the lack ef physical separation between non-Class IE and Class IE circuits inside the nuclear steam supply system (NSSS) cabinets at Hope Creek.
It appeared to the NRC staff that the design of the Hope Creek system failed to provide adequate physical indepen
- dence of circuits inside the MS$$ cabinets, as established in current regulatory practice..
Hope Creek SSER 5 7-5 P'
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SBM-1057 ATTACHMENT 2 CORRESPONDENCE FROM STRUTHERS-DUNN
r,f FASYLINh 7840467AOC1 13MAY66 07:52/G7:53 EST j
VIA:
7103807619 TO:
62762726 YANKEE FMH STRUTHOUNN PIT STRUTHOUNN PIT MAY 13, 1986 YANKEE ATOMIC ELECTRIC 00.
FARMINGTON, MA ATTENTION: NAVIN PATEL S-D REF # 7948 DEAR MR. PATEL, DURING OUR TELEPHONE CONVERSATION OF 5/8/56, WE DISCUSSED THE DIFFERENCE BETWEEN THE STANDARD RELAY TYPE 219XBXP AND THE SPECIAL RELAY TYPW 219XBX234.
THE 219XBX234 IS WIRED THE SAME AS THE 219XB'P BUT THE CONTA0TS ARE CONSTRUCTED IN SUCH A WAY A9 TO KEEP THEM AS FAR REMAVED FROM THE FRAME AS POSSIBLE.
ALSO THE 219XBX234 USES A SPECIAL FLAME RETARDENT BEARING PAD.
IF YOU HAVE ANY FJR1 HEN QUESTIONS OR IF I MAY BE OF ADDITIONAL ASSISTANCE, PLEASE LET ME KNOW.
BRUCE FIGUEROA CL/END YANKEE FMH N iMM O
s
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_ _ _ _ _ j e
O SBN-1057 1
ATTACHMENT 3 ISOLATION RELAY CIRCUIT FUNCTIONS P
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ATTACHMENT 3 ISOLATION RELAY CIRCUIT FUNCTIONS ISOLATION RELAY TRAIN B INPUTS (COIL)
TRAIN A OUTPUT (CONTACT)
KB1, KB3 Contacts from alarm annunciate Relay contacts for alarm annunciate and alarm return horn auxiliary and alarm return horns for the relay in hardwired annunciator primary VAS alarm system.
system MM-UA-51.
KB2, KB4 Contacts from alarm annunciate Relay contacts for alarm annunciate and alarm return horn auxiliary and alarm return horns for the relay in hardwired annunciator secondary VAS alarm system.
system MM-UA-55.
KB5 Contacts from the reactor trip Relay contact in control circuit and bypass breaker and the SSPS for turbine trip on reactor trip.
for turbine trip on reactor trip.
KB6 Contacts from the SSPS for Relay contact in control circuit SI or steam generator hi-hi for steam generator feed pump level.
turbine FW-TD-1B.
'KB7, KB8, KB9 Contacts from the SSPS for Relay contacts for rod stop con-rod stop controls and indi-trols and indication.
cation.
KB10, KBil Contacts from Westinghouse Relay contacts for containment process protection cabinet pressure HI-3 test bypass status CP-2 for containment pressure monitor lights.
HI-3 test bypass.
KB12 Contacts from SSPS for steam Relay contact for steam dump dump interlock bypass.
interlock bypassed status monitor light.,
ATTACHMENT _3, ISOLATION RELAY CIRCUIT FUNCTIONS ISOLATION RELAY TRAIN A INPUTS (COIL)
TRAIN B OUTPUT (CONTACT)
KAl Contact from Westinghouse Relay contact in control circuit Auxiliary Relay Rack No. 2 for boric acid transfer pump, for makeup permit signal.
CS-P-B.
KA2, KA3, KA4, KA5 Contacts from Westinghouse Relay contacts in control circuit Auxiliary Relay Rack No. 2 for for pressurizer heater back-up pressurizer pressure and level.
group B.
KA6 Contacts from Westinghouse Relay contact in control circuit Auxiliary Relay Rack No. 2 for for pressurizer relief isolation pressurizer pressure and temp-valve RC-V-124.
erature.
KA7 Contacts from Westinghouse Relay contact in control circuit Auxiliary Relay Rack No. 2 for for pressurizer pressure control pressurizer pressure and temp-valve RC-PCV-456B.
erature.
KA8, KA10, KAl2 Contacts from reset, silence, and Relay contacts for reset, silence, acknowledge switches in hardwired and acknowledge for hardwired annunciator system MM-UA-50 and annunciator system MM-UA-51.
the VAS alarm system.
KA9, KAll, KA13 Contacts from reset, silence, and Relay contacts for reset, silence, acknowledge switches in hardwired and acknowledge for hardwired annunciator system MM-UA-54 and annunciator system MM-UA-55.
the VAS alarm system.
KAIS, KA16, KA17 Contacts from reactor trip and Relay contacts to VAS alarm bypass breaker position auxiliary system.
relays.