ML20095A442
| ML20095A442 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 08/13/1984 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 2NRC-4-113, 82-04, 82-4, NUDOCS 8408210476 | |
| Download: ML20095A442 (10) | |
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2NRC-4-113 (412) 787-5141
- 2) 923-M0 Nuclear Construction Division econ (412) 787-2629 Robinson Plaza, Building 2 Suite 210
- Pittsburgh, PA 15205 August I, 1984 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION
Dr. Thomas E. Murley Administrator
SUBJECT:
Beaver Valley Power Station - Unit Na. 2 Do ket No. 50-412 c
Significant Deficiency Report 82-04
" Westinghouse Solid State Protection System" Gentlemen:
The attached report provides the information required by 10CFR 50.55(e), with respect to the previously reported potential for an unde-tectable failure of the Westinghouse Solid State Protection System.
Paragraph No. 5 of the attached report addresses the corrective action which will rectify this problem in the Beaver Valley Power Station -
Unit No. 2 SSPS.
No further reports are anticipated on this matter.
DUQUESNE LIGHT COMPANY s
By 9 E.(f. Woolever Vice President RW/nul Attachments cc:
Mr. R. DeYoung, Director (3) (w/a)
NRC Document Control Desk (w/a)
Mr. G. Walton, NRC Resident Inspector (w/a)
Ms. M. Ley, Project Manger (w/a)
Mr. E. Licitra, Project Manger (w/a)
INPO Records Center (w/a)
SUBSCRIBED AND SWORN 10 BEFORE ME THIS A DAY OF C3I ___
, 1984.
8408210476 840813 I
/ /
{DRADOCK 05000412 Notary Public PDR ANITA ELAINE REtTER, NOTARY PUBLIC ROBINSON TOWN 3 HIP, ALLEGHENY COUNTY MY CCM'.!!OSl0N EXPJRES CCTCOIR 20,.19M ^
4 p d-
7 United Stctes Nuclear Regulttory Commission Dr. Thomas E. Murley Page 2 COMMONWEALTH OF PENNSYLVANIA )
)
SS:
COUNTY OF ALLEGHENY
)
On this d/cf day of Qd,,
///
, before me, a Notary Public in and for said Commbwealth and County, personally appeared E. J. Woolever, who being duly sworn, deposed and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute behalf of said Company, and (3) the and file the foregoing Submittal on statements set forth in the Submittal are trup and correct to the best of his knowledge, MEb '
tb b
G Notary Public ANITA ELAINE REITER, NOTARY PljBLIC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPlRES OCTOBER 20,1986
BEAVER VALLEY POWER STATION - UNIT NO. 2 DUQUESNE LIGHT COMPANY Report on Significant Deficiency 82-04
" Westinghouse Solid State Protection System" 11.
SUMMARY
Westinghouse has ident ified a potential problem in the solid state protection system (SSPS) on-line testing circuits for system relays which could result in an undetect able failure.
The SSPS provides pro-tection and control of plant equipment, reactor trips, and actuates the engineered safety features systems.
2.
IMMEDIATE ACTION TAKEN Westinghouse notified the Nuclear Regulatory Commission of the po t e n-tial problem in a letter dated August 6,
1982, from E.
P.
Rahe to Richar i DeYoung, Director of the Of fice of Inspection and Enforcement.
On August 30, 1982, Duquesne Light Company (DLC) notified R. Keimig of the Region I of fice by telephone.
Interim reports dated September 29, 1982 and May 19, 1983, provided additional information.
3.
DESCRIPTION OF DEFICIENCY Periodic testing of the solid state protection system requires actua-tion of system master relays and continuity test of the output relays.
During testing, the voltage applied to the output relays is reduced frms 120V ac to 15V dc.
A pushbutton test switch actuates the master relays and opens a switch contact shunting a proving lamp shich veri-fies continuity of the output relays.
Upon completion of the test, 120V ac is restored to the output relay cirucits.
If the shunt contact falls to close and the system is called upon to operate,120V will be app?. led to the output relay through the proving lamp.
The result could be burnout of the lamp and failure of the output relay to actuate.
4.
ANALYSIS OF SAFETY IMPLICATIONS Failure of the SSPS output relays to actuate when required would pre-vent safety systems from automatically per forming their safety func-tion.
5.
CORRETIVE ACTION TO REMEMDY DEFICIENCY The design of BVPS-2 will incorporate the hardware changes described in Westinghouse Technical Bulletin NSD-TB-84-01.
DLC expect s that these changes will be incorporated in the BVPS-2 SSPS prior to July 1, 1985.
6.
ADDITIONAL REPORTS Duquesne Light Company does not anticipate that additional reports will be required on this matter.
L&
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DESIGNATED ORIGIrAt. MbyD Westinghouse
- "d 87 M N0 blear Technical Bulletin gig 3 FM AUG -6 PH 4: 55 An advisory n5tice of a recent technical development pertaining to the installation or operation of Westinghouse-supplied Nuclear Plant equipment. Recipients should evaluate the information and recommendation, and initiate action where appropriate.
P.O. Box 2728, Pittsburgh, PA 15230 Number
(
Eblect NSD TB.84-01 P(YrFNT QL_yN1 MWf'rART.R FA T T.TTRR-ONT,Y NF W RT RW Y W'M Date System (s)
MARCH 20, 1984 SOLID STATE PROWCTION SYSTFM Affected Plants AFFECTS SAFETY RELATED EQUIPMENT S.O.(s) 387 SEE ATTAClafENT III YES X
No
(
References y
7 Sheer Of SRC-ID-82-194 CHANGE CDN'IROL NO 6156 In
- 1982, reviews of the Solid State Protection System (SSPS) revealed a potential undetectable failure which could develop in connection with use of the System's on-line test features.
By generic letter, all sites were advised of a minor revision to the test procedure which would assure that such a failure could not go undetected.
(
The postulated potential failure is described in Attachment I, and the preventive additional testing is described in attachment II.
Although no design changes l
were deemed necessary to resolve safety
- concerns, Westinghouse undertook a design review of the matter in the interest of prudent engineering.
l l
That review has now been completed, and affected plants (sse Attachment III) will be sent formal change recommendations for a
relatively minor circuit modification which will obviate the need for the special testing.
Conceptual descriptions of the changes are shown in Attachment IV, and detailed change
(
recommendations will be sent as soon as they are completed.
AdditionalInformation,if Required, mey be obtained from the Originator. Telechene 412 - 733-5777 or(WINI286 - 5777 U J W Y _s NY W
/ sf/1 J
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g W. H. Furfari J. R. Terrye Manager
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Elec. & Inst. Services Elec. & Inst. Services r
No.me,weniaiaouw eiecie e co,co,si.on no,6is emo ove. meme eny.e,renty o, reo,ennistion..in reso.ei to ine ocevrecy, ewno#eteaen or va vi.
e nees of the information conte.ned in emie report or sessme any retoonsinisity for 16en lity os damage on.cn mey soeust from the use of sucn information.
wasvinsoMouse pomu seste l
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TB 84- 01 Shtet 2 of 7 Power m
l'
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l Safeguards l Device
(
%h S
l Normal 120 VAC Pushbutton 3jst 15 VOC (Test (Momentary',)
1 Safeguards e
i
/
Test T
Switch 1
8 l
=
E i
s
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Logic (shown as contacts
'NC for simplicity)
Normal l
M l-(_.
48 VDC
- NOTE: Switches shown in' normal 1
(non-test) position
)
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a.
Y NORMAL OPERATION:- Logic ' contacts close to pick ~up Master relay M.
Master relay contacts close to apply 120 VAC to Slave relay S.
. Slave relay contacts close to power the Safeguards device.
TEST OPERATION: " Relay mode selector switch' (not shown) to TEST position switches
~
, slave relay power from 120 VAC to 15 ~VDC.. Master relay power i
remains 48 VDC.,
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- Pushbutton test switch contact (1)~ picksup Master relay M q
Pushbutton contact (2) removes lamp shunt so that 15 VDC is..
. appifed to Stave relay coil thru proving lamp L.
s 3
l
'f *51 ave' relay is not' picked"up because,of reduced ' voltage of' cc.
s.y.,J,._
15 VDC, c, s
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a 4
- PROBLEM
If the contacts' shunting the proving lamp L do not reclosewhen
' the puchbutton is released and the system is returned to nomal, then 120 VAC would be applied to the Slave relay coil thru the proving lamp if Safeguards actuation were called for by)the i
logic contacts.
(Lamp may fail before relay 5 operates
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t SIMPLIFIED SKETCH OF TYPICAL SAFEGUARDS ACTUATION RELAY TESTING IN THE SSPS
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FWM 8-5-82 (Redrawn 3/2/84)
ATTACMENT I l
i
.-.-___,.___-_J-___
i 4
TB-84-01 Sheet 3 of 7 SOLID STATR PROTECTIM SYSTEM MASTER RELAY AND OUTPUT RELAY TEST I
Perf orm the test described below insnediately f ollowing completion of the Solid State Protection System (SSPS) Output Relay Testing.
This test will ensure that the pushbutton or relay contacts used to shunt the output relay continuity lamps located on the Output Relay Test 4
Fanel have returned to the closed position.
(
To check the output relay continuity lamp shunts on the Ou tput Relay Test Panel, utilize the Safeguards Test Cabinets as described below 1.
For each of the output relay continuity 1mnps, select an output i
(slave) relay which has its continuity checked throught the lamp.
For f-plants with the standard 2-train SSPS this will be eight relays per
(
train and for plants with the "new" 2-train SSPS or the 3-train SSPS i
this will be sixteen relays per train.
This selection can easily be performed by using the Output Relay Test Panel Selections table located i
in the System Maintenance section of each SSPS Technical Manual.
2.
Using the Engineered Saf eguards System Final Device or Actuator Test Procedure select the sections of the-tes t which pertain to the output relays selected above.
This can easily be done by referring to the table of contents.
i 3.
Before proceeding with the selected test sections, verify that all instructions pertaining to precautions, limitations and initial conditions have been followed.
[
4.
Ensure that the Mode selector switch on the SSPS logic train Output
(.
Relay Test Panel is placed in the Operate postion.
5.
From the Saf eguards Test CabiNt (STC) proceed with the selected sections of the Engineered Safeguards System Final Device or Actuator i
Test Procedure.
For each 'of the test sections verify that the output relay continuity lamps on the associated SSPS Output Relay Test Panel da' nat illuminate wh!!e rotating and depressing the STC test switches.
If t
the SSPS output relay continuity lamps do not illuminate and the i
selected sections of the STC tests are successfully completed, all of the continuity 1 amp shunt. contacts have properly returned to the closed 4 m(
position.
s 7
a,,
,w 4.,
If an output relay' continuity lamp illuminates during testing from f-the STC i t is an indleation that the lamp's shunting contact is open.
. (
Should this occur, remove.the associated SSPS logie train f rom service and replace the Output Relay. test pushbutton (f or. "new" 2-train and 3-train SSPS, replace the : relay whose ' contacts used f or shunting the j
. lamps-failed to close). 'Atter. replacement,-retest the master and output relays - f rom the Output. Relay' Test Panel: and. perf orm the tests listed.
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n
- 4,
. p q p N.,. ' s
- above, e
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, 7.
If an output relay 'eontinuity tamp does' not illuminate during-testing from the 'STC and the S1C test is unsuccessful it may be an indication that the continuity lamp shunt contact is open and that the continuity 1mnp itself has opened.
If this is the case, replace the Output Relay Test pushbutton and the continuity lamp and retest.
If the f
continuity lamp and its assoelated shunting contact are found
(
operational, this is an indleation of a f a!!ure in the Final Devlee or i
its Actuation circuit.
I ATTACHMENT !!
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h-84-01 Shget 4 of 7 ATTACHE NT 4 APPLICABLE DOESTIC AND INTERNATIONAL PLANTS
[
PLANTS WITH STANDARD 2-TRAIN SSPS Salem 1* and 2*
C Cook 1* and 2*
+
Ringhals 2*, 3*,and 4*
Farley 1* and 2*
i Beaver Valley 1* and 2 Diablo Canyon 1 and 2 Trojan *
+
Angra 1*
Byron 1 and 2 Braidwood I and 2 North Anna l* and 2*
Sequoyah 1* and 2*
Watts Bar 1 and 2
+
Almaraz 1* and 2*
+
Asco 1* and 2 Virgil Summer *
+
Ohi 1* and 2*
McGuire 1* and 2*~
Catawba 1 and 2 PLANTS WITH "NEW" 2-TRAIN SSPS
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M111 stone 3 5 "E 5
Seabrook 1.and 2'
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L E * * %
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Comanche Peak 1 and 1 T'"t Wolfereek 1
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--;m Callaway 1 n ?. ".i u..'y 7,,
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,1, Shearon Harris 1 c
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Krsko*
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' Ko-Ri 2*
f., T3 J Sf" ' TJJJ.f..
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fMaanshan-T and 2
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T Vogtle 1 and 2
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Korea 5, 6, 7, and 8
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.Vande11os 1.
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- +
,Napot Point i
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. PLANTS WITH"3-TRAIN.$$PS l
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South Texas, l', and 2' * ~ '. ' s' 9.' t m o^; - ;, :.
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Operating Plant
+ International Plant I
W ATTACHMENT III
Sheet 5 of 7 TB 8441
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Co*L hiCTE* M00E SELECTCn %Ircti 1:
l SHowH w TEST FCs/7/CN l
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l CPtMTION i
TEIT/0PfMTE SWITO( TO Tt3T I
asaarer.
- Ed' e slave 120 YAC reduced to 15 VDC e 48 YOC mester relay groufid retur es MASTER Rtuf SELEC*CR SWITOI 70 RELA 7 !!!M TISTC Mp l
, 3,,,
o,1 e Master relay energtzes 88' e Master relay contacts close 15 VCC *.s. stave l
sanne 88**
(31 ave not enerstred on 15 (CC' 7l TE37 PUSMUTTCH CE79E33E3 l
4, -
e Test lass CM conefra circuit ane slave rela-cott continuity, TE3T 7U5MUTTCM RELIAsta p
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arr conri-te,t i e..w.d DELETE l V g"1b-
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TB 84-01 Sheet 6 of 7 l'
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TEST RRLAY cawrA<r ine)
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SfCWH IN TEST PHJr/QN s
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TEST /0PtMTE SWITm TO Tt37 He ve*
e Slave 120 VAC reduced to 15 YDC
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,*,e e 48 VOC master 4 slave relays ground returnet i
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I aness MSTtX RELAY 5tLLCTOR SWITQt TO AELAY SEIM TESTI
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7
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- Mester relay energtzes I
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- Mester relar contacts close 15 Ytc to slave
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(11 ave wt eneref ted on 15 YOC)
/
M.1 TEST PU5HGUTTCM OEPRL33ED
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s' M88 k'
as Ys4 Assetes 2
- Test relay eneryttet o
ue e Test relay contacts open rl
- Test tame en confirme etreutt and slave rel Ca j
cett continuity TRIT PUSHOUTTCM RtttASED 6 Test relay de-energized oe oe
,, f *" " "f*
- Test relay contacts close e Test lose CFF conff ree test tase shunted J[y((,
s s
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w' CUTPUT RELAY TEST GRCUIT
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EXMNDED
& MAIN SSPS y< ([._ z y...
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Sheet 7 of 7 TB 84-01
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- M / WEAAft Sir!TOf TO TEIT igg vee
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o Slave 120 VAC reeusse to 15 VOC s
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o Slave relays ground returnet
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9 Test relays Ta & Ts aneegtsed g
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- , AssertIP METER NELA'? SILICTOR'Saf!TQI TO NELAT Stim 7t3 TID
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e Master ruler enerftses
^. o Master relay contacts close 15 fCC to slave -
tre gl
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(Slave not eneretted on 15 TOC) e or
,8
E.1 ftIT PUEMduTTon OEPRE13ED 4
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- lt 8l g
- 9. 3 e Test relay energises
- * * ~.
'e Test relay contacts even
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- .'!,' ** *.ee se e
e Test lame OM confirme elrcuit and slave reley se esf1 senttnef ty
. {g',,,dae gg agem-
% ygsyra. TEIT PUSNgttrTOR AELEAftp af-'" - *;o
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. D Test relay dJ-energited i
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'o Test relay contacts close o
eh e Test less 0FF confirms test less shunted t,.
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CUTPUT REW TEST GKUIT-
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