ML18219C133: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
(StriderTol Bot change)
 
Line 1: Line 1:
{{Adams
#REDIRECT [[05000316/LER-2075-003, Letter from Indiana & Michigan Power Co Informing NRC of an Abnormal Environmental Occurrence Which Occurred at the D.C. Cook Nuclear Plant at Approximately 1510 Hours on 2/6/1975]]
| number = ML18219C133
| issue date = 02/07/1975
| title = Letter from Indiana & Michigan Power Co Informing NRC of an Abnormal Environmental Occurrence Which Occurred at the D.C. Cook Nuclear Plant at Approximately 1510 Hours on 2/6/1975
| author name = Jurgensen R
| author affiliation = Indiana Michigan Power Co
| addressee name = Keppler J
| addressee affiliation = NRC/RGN-III
| docket = 05000316, 05000315
| license number = DPR-074, DPR-058
| contact person =
| document report number = LER 1975-003-00
| document type = Letter, Licensee Event Report (LER)
| page count = 10
}}
 
=Text=
{{#Wiki_filter:~ g pe.G'Y qo 4~
0 X
RQM.L~SQPKSK4885
              +r                  DIRECTORATE OF REGULATORY OPERATIONS REGION I I I ot~                                799 ROOSEVELT ROAD                                TKLZPHONE GLEN ELLYN, ILLINOIS 60137                            (812) 888-2660 A',  RO  Inspection Report No.
Transmittal Date Distribution:                                      Distribution:
RO  Chief,  FS&EB                                  RO  Chief,  FS&EB RO:HQ  (5)                                        RO:HQ  (4)
DR  Central Piles                                  L:D/D  for Fuels  & Naterials Regulatory Standards    (3)                      'DR  Central Files Licensing (13)                                      RO  Files RO  Piles B. RO  Inquiry Report  No.
Transmittal Date Distribution:                                      Distribution:
RO  Chief,'S&EB                                    RO  Chief,  FS&EB RO:HQ  (5)                                        RO:HQ DR Central Files                                    DR  Central Piles Regulatory Standards    (3)                        RO  Files Licensing (13)
RO  Files C. Incident Notification Prod:      ~ndian & Michigan Elec. Co., Docket No. 5O-315 (Licensee & Docket No. (or License No.)
Transmittal Date                      FEB    l,g  1975 Distribution:                                      Distribution:
RO  Chief,  PS&EB                                  RO  Chief,  FS&EB RO:HQ  (4)                                        RO:HQ  (4)
Licensing (4)                                      L:D/D  for Fuels & Materials DR  Central Piles RO Piles                                          RO  Files R>t
 
t>> >1- P 1
P
  .--~ pR~<i          .
              '.~NB'A 8 lill.":EISA i P8""ZB
                              'C, COOK NUCLEA'R PLA24T CVNP~APl'ONAD PO Has 458, BrMgcaun; Michigan.491M Febr.uary    7,. f975',
N)'.. AG Kepyler, Regional Director; Directorate 'Qf Regulator"y'perations                          '
Ur'rites States nuclear Regulatory Coramission.
Region ILL
      ?99 Roosevelt;. Road.
Glen, H,fyrr, IL'0'f37
                                                                'gerat~nq License          DPA-.58 00cftetlearNn 5Q-'335.
                                                                'FO "50~3'1    5/76-3 I                tAI I' '0            ~ I '1 '& tM4Wl
 
==Dear':==
. Nl-. KAPP Ter:
Thfs    report's to inform you          of- an'Ab'no+,al Environmenta'f Occul"rencc-.
Nhir ch "occUrl l Bd  Bt tlIP Dona 1 d~ Cv Cook Ruc                    " Pl ant't approx'lnratel hours on. February 6, 1975;                                                                  y'510" An'nswip>ed re'tease oF          a waste holdup tani";"eras made in.vio'fatfon Technics'f Specifications 2 4..2.biand 2;2;3.3.                                  of'ppendii'8" The South: Haste Evepor~tor, Condensate.                            Tail'as released. tor the- dischar ge tunnel without having: been;sampled~for. radioactivity,and. boron'con-.
cento cRt'f OA ~"
The      radf6actfvtty:monitor. (R-.'f8) af this R"d$ ation.;f'fonitor'fog System in; the discharge line Mhieh.was. in-operation;did not: reach-t}>'e alarm point and-the. recorder: trace indicated no md(oactivity $ n~ 2hs release; Est'i-mated-amount of'. v'adfaactivity; based upon.,thr history                          ihip''fa>
of: pr io". p7~nne5-raTeases.and analysis af-'he source tank'indicated a- re)casa:ot approxi-mate'fz 47 v:C4          tritium..
An-.investigation. is.sU7'f .in~progress ta=detenmne the cause of the
. error Ines action. to- prevent recurrence. however.                                            indications are-that. an-.error..-in; the written proced~ee caused the unp1anned: release.
OQl. consenra        .ive estimates Indicate that the d:scharg was bare'fy-above the n&#xc3;n&vum        detectable. activities.and be1olv the al)o~>able. limits for boron.discharges.              Based-upon these estimates, the health:-and safety 'o4.
the pub'fic. has net, been.:af'fected The NRC Resident, I'nspector,.le:. K.'R Baf<er, was if1Forin  .                          d:ot'his    event by- telephone*at 2070'houvs.; February 6,. 19T5'..
 
AFC DIST'n    JTIO.'I FOc~ PNNRT 50 DOCILE 7 ielA                  I IAI
{TEi.iPOBARY FORi"I)                ~
1550
                                                                                                                    'ONTROL NO:
F,RO,.>.American Electric Power                    DATE OF DOC                DATE PEC'D        LTR                                    OTHER
                'New York, New York 10004 Mr. J.E. Dolan                            2-3-75 T.O:                                                          ORIG            CC  OTHER            SE NRC                                        1    signed                                    SENT LOCAL PDR CLASS          UiNCLASS            PROPIiUFO            ,
IiVPUT          NO CYS REC'D            DOC~ cT iVO'0-31 316 DESCRIPTIOV:                                                                ENCLOSURES:
Ltr reporting an abnormal occurrence at the D.C. Cook      facility....concerning a deficiency                                      'ACKNOWLEDGED
          ...diode failures in the Engineered Safe>>
guards System            test  circuitry.....
D.C. Cook
                                                                                                    >O~OT BE140VE FOR ACT IQ.'I',/Ii.'FO R;I ATIO U                    2-12-75              JB BUTLER (S)                      SCHIlENCER    (S)            ZIEMANN {S)                REGAN    (E)
W/      Copies                  W/  Copies                  W/ Copies                  W/ Copies CLARK (S)                      STOLZ (S)                    DICKER (E),                LEDS (S)
W/ Copies                      ,W/ Copies                  ..W/ Copies                  Wj Copies PARR (S)                        VASSALLO (S)                  KNXGHTON    (E)
    ~
SPEXS    (S)
W/ Copies                      W/ Copies                    W/ .Copies                W/  Copies
  ~N  KNIEL (S)                      PURPLE (S)                    YOUNGBLOOD      (E)
W/lt Copies                    W/ Copies                  .W    .Co ies                            e I N T E R iV A 'L Q I $ i, ")UTIQN I
LIC. ASST.
P                        TECH REVIEW COSTELLO DENTON                                              A/T .IND HAEC PDR                                                      GR'INE S                  DIGGS (S)              SRAITNAN 4GC,      ROOM    P-506"A            +I!AC  CARRY            GAMMILL                    GEARXN (S)              SALTZMAN OSSICK          /STAFF                ~IGHT                AASTNER                    ' GOULBOJRNE          (S), B.            HURT KASE                                  CC'AWLICKX              BALLARD                    KREUTZER (E)
GXAMBUSSO                          tPMAO                -
SPANGLER                  IZE (S)                PLANS BOYD                                                                                    NAIGRET (S)            NCDONALD MOORE {S) {BWR)                    HOUSTON                  ENVIRO                    REED  (E)              CHAPMAN DEYOUNG (S) {P~IR)                  KZOVAK                  IS)LIER                  WSERVXCE (S)              DUBE w/input
    . SKOVHOLT (S)
(S)    'OLLEK 4%0SS APPOLITO DICER KNXG}720N
                                                                                              .SHEPPARD (S)
SLRTEA,    {E).    'A.E.            COUPE Hartfield P. COLLINS                                                                                                    "KLECKER (2)'MITH TEDESCO              YOUNGBLOOD                          (S)
DENISE                                  NG                  REGAVI .                  TEETS (S)              4'.            WXLLDQIS' REG.OPR                              LAINAS                PROJECT LDR                WXLLIAMS (E)
    'IN'ILE & REGION 'QQ                  4ENAROYA                                            WILSON      (S)
        .R. WILSON            ~ STEEL      4VOLXMER            HARLESS                    XNGRAM      (S)
EY, TL Ri~.'.XL Z-4-TXC (ABERNATHY)
MM            ~~: I            1  M. Pi"NNXNGTOiVP DISTR I BUTIQi~!
(1) (2) (10) -NATIONAL LABS RM'-201 G.T.
1-PDR SAN/LA/iNY 1 "BROOKHAVEN NAY LAB Ck NSIC(BUCHANAN)                                  1 "CONSULTANTS                                                1-G. ULRXKSON, ORNL 1-ASLB                                              NEI~/BLUI'IE/AGBABX AN                                    1"AG1IED(RUTH GUSSMAN) 1"NEWZON &IDERSON                                                                                                  'RM B        127 GNTa
:  ~.5"ACRS.        SENT TO LIC, ASST.                                                                                ,1"J.          RUNKLES> RM          E-201
:G.T.,
 
                                                  ~ 3
                            ~ 1              "n
                                          ~    ~
C f 4
lt'l'1~ ~  P I
                    )  'h
                            ~  ~  ~ ~  5  ltl        ~  ~
1 n
                                                        ~ ~ ~
        ~ ~ ~ ~ ~
                                    ~ ~
 
w    r
                                        ~ gegulatorg      Docket      ji!j;      ~
AMERICAN ELECTRIC POVfER Service Corporafi on 2 Broadtoati, Neto York, N. Y. 10004 (2J2J 422.4800 JOHN E. DOLAN Erccntiec Vice I'cccHcnt Engincccing 4 Concttnction 6                        February 3, 1975 (gS      cP Docket        No  50-3 and      6 CPPR No. 61 DPR No. 58 U.S. Nuclear Regulatory Commission Directorate of Regulatory Operations                                    ,~a@~+@
799 Roosevelt Road                                                  g e"i,e<e~,
Glen        Ellyn, Illinois    6013'7                                      4<i+
Attention: Mr. James            G. Keppler                                    ov Regional Director Gentlemen:
Pursuant to the regulations of 10CFR50.55(e), we herewith submit this report concerning an equipment deficiency which occurred during construction at the Don'aid C. Cook Nuclear Plant, Bridgman, Michigan. Unit 1 is currently operating under AEC Operating License DPR-58 and Unit 2 is being constructed.
under AEC Construction Permit No. 'CPPR-61.
The equipment deficiency has been identified. as diode        failures in the Engineered Safeguards System test circuitry. This test circuitry is utilized, to periodically verify the continuity of relay coils which are required for the proper operation of the Engineered Safeguards System.
The subject diodes are used for the sole purpose of protecting certain indicating lamps in the Engineered Safeguard, System test circuitry from surge voltages generated when associated relays in this system are reset (de-energized)                        .
Such a relay reset would occur after these Engineered. Safe-guards System relays have been energized in the performance test. Diodes associated with these relays failed during initial performance testing of the system at which time detection of the failure occurred.
 
                            ~<<
                  ~ l~
                        ~ ~
        ~ << I
  ~ ~ lf
 
Mr. James G. Keppler                              February 3, l975 An investigation into the deficiency has determined that the peat reverse voltage rating of these particular diodes is insufficient to withstand the surge voltages generated during Engineered Safeguards System Relay de-energization.
This resulted in diode failures and subsequent damage to Engineered Safeguards    System circuitry.
Had  the diode  failure occurred  undetected during plant operation, and had the Engineered Safeguards System been called upon to operate during the time interval that the failure remained undetected, proper operation of certain functions of the Engineered. Safeguards System may have been prevented. However, the indications of this failure during the initial performance testing were clear and immediately discernable to both test and operations personnel. Therefore, due to the comprehensive testing program carried out on this equipment prior to plant startup, no possibility existed. for placement of the subject Engineered Safeguards System test circuitry in service with this diode deficiency remaining undetected.
To  prevent future damage, all diodes in the Engineered Safeguards System Test circuitry subject to failure by this mechanism have been removed and replaced with varistors with the appropriate voltage characteristics.
All Engineered    Safeguard circuitry, including any circuitry with  the above  modification,  has been tested. All circuitry now operates within required specifications and. no varistor failures have been experienced under repeated operation.
Very  truly yours, John E. Dolan Executive Vice President Engineering 8c Construction JED:ma cc:  Gerald Charnoff, Esq.
R. C. Callen, Esq.
R. J. Vollen, Esq.
R. Nalsh, Esq..
P. M. Steketee, Esq.
R. S. Hunter R. W. Jurgensen  Bridgman
 
h~
                                          ~
                                        ~
h ~
h r      ~  I  ~ h h'I
                                  ~I \
h                lh                  h 4  I              ~    '*I h
h}}

Latest revision as of 15:38, 5 January 2025

Redirect to:

Retrieved from "https://kanterella.com/w/index.php?title=ML18219C133&oldid=4971529"