ML19208B814
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UCENSEE EVENT REPORT Palisades CONTACL 8LCCK:l l
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l (PLEASE PRINT ALL REQUIRED INFORMATION) 1 6
NAME UCENsE NUM8ER Y
TY
] l Ml AlP l A lL l1l l 0 l 0 l-l0 l 0 l0 l0 l0 l-l 0 l 0 l l hl 1 l1l1l1l lol1l 7 89 14 15 25 26 30 31 32 EE CoCx T NUusEn EVENT CAT REpont CAT:
E 01 CCNT l
- l
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[,L_j l 0 l 5 l 0 l-l 0 l 2l 5l 5l l1 l1 l2 l 5 l7 l 7 l l 1l 2l1 l 6 l 7 l 7l 7 8 57 58 60 61 68 69 74 75 80 EVENT OESCRIPTION o2 l During nor=al steady state operatior, the "R" bus beca=e de-energized causing a co=-
l 7 89 80 c3 l plete loss of off-sit'e power and resulting in a loss of =ain condenser cooling water. l 7 89 80 04 The reactor was manually triteed. The uricarf ulant was stat 111:ed in the hot een-l 7 89 80 05 l dition and was berated.
LCOs of Tech Snee 3.1.1, 3.7.1 vere exceeded.
Event similar 7 89 SO Oe l to ER-77-Oh7.
(Contd on attached sheet.)
l 7 89 80 P,
SYSTEM u.
CCMAONENT CCMAONENT CCCE CCCE COMPCNENT CCCE SUPRER MAMJFanM.
07 lE l A W
lZ l Z l Zi zi Zl Zl W
lZl919l9l lY 7 89 10 12 17 43 44 47 CAUSE DESCRIPTION Oe l Cause of "R" bus loss not kncvn and is still under investigation.
l 7 89 80 09 l l
7 89 80
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FACE.lTy METHCC CF STATUS
% POWEA CTHER Sl&TUS CISCOVEAY CtSCOVERY CESCAPTON 11 lEl l_0l6l5l l N/A l W l
N/A l
7 8 9
10 12 13 44 45 46 80 C
CCNTENT AELEASEC CF AEaASE l 3h.h (Contd below )
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Secondary water to atmos here.
l AuCUNT CF ACNTY LCCATCN CF AELEASE
[JJ 12 lGl 7 8 9
10 11 44 45 80 PERSONNEL EXPOSURES S
NUMBEA TYPE CESCAPTCN 13 l 0l 0 l0 y
N/A l
7 89 11 12 13 80 y:;,]iq)
PERSONNEL INJURtES NuueEA CESCmpT:cN r
l 0l0 l 0l N/A J
C
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14 7 89 11 12 f-l9 i/ M j /,g l SC
' i-FROEA3LE CONSEQUE: ICES t
q O 'ju i: gU LJ Lb d C C L
g 7 89 SC
? D 09fg2 g4 LCSS CA OAMAGE TO FAC:UTY 4
- .h GNh TYPE CESCAPTICN b VV' l
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N/A 7 89 10 80 PU BUC.TY 17 l N/A QQ()f)GG l
7 a9
-~
eC ACOITIONAL FACTCRS J l ( A= cunt of Activity - Contd) mierecuries of I-131: 29.2 eierecuries of !-133 l
7 89 60 d!
l 7 89 60
Attach =ent to Licensee Event Report 77-055 Event Description (Contd)
During the incident, a pri=ary coolant leak occurred in the letdown line.
The leak was isolated.
Both diesel generators operated nor= ally to supply electrical power during the incident.
Electrical power was restored in 2.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />.
The delay in reporting this event was discussed with Region III.
See our letter dated December 9, 1977 (ER-TT-55) 390067
LICENSEE EVENT REPORT Palisades CONTRCL ELCCK:l I
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(PLEASE Pn!NT ALL REculAED INFCRMATION]
1 6
LCENsEE LCENsE CVENT NAME LCENSE NUMGER TYPE TYPE
] l Ml :l ?l Al Ll1l l0l0l-l0j010l0l01-l0l0l kl 1l1l 1l 1l l0l1l 89 14 15 25 26 30 31 32
" ypE T
CCCx!T NUMBER EVENT CATE REPORT CATE 01CCNTl*I*l 1 -l LTJ l nI s 101-i n I lalg 7 89 10 12 17 43 44 47 CAUSE DESCR;PTICN O8 l The cause of the
'R' bus less is unknown at this ti=e.
To =itigate the consequences l
7 89
- 0 gg l of future 'R' bus icsses, the tripping sche =e for the 'R' bus has been =cdified so g
7 89 EO 1g l that a signal frc= the s' ripping relay (h86 s-x) vill trip neither the 3h5 KV supply l
68
,,em METHCC OF (Cone d) 60 STATUS
% PCWEA CTMEA STATUS CISCOVERY 03COVEAY CESCRSTCN L'S I El Il l l
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NA l
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NA l
7 8 9
10 12 13 44 45 46 80 FCAM CF ACTMTV CCNTENT RELE.ASEC C5 AELEASE } 15 CUNT QF ACTMTV LCCATCN OF EELEASE A
d b
cent J
l l Secondary vater to at:0 sphere l
7 8 9
10 11 44 45 EO PERSONNEL EXPCSURES NUM8EA Tvo DESCA'ATCN
[Gijl010;0; l:El l
NA l
7 L9 11 12 13 60 PERSONNEL INJUA!ES
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M NuMeEA CES *pTICN rs:
,1.!nj l0 nl al NA U ' '; '
14
!,:)
l 7 89 11 12 b,$<!lp"l'!d,!/2,:
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,, y tq p 00 PR03A3LE CC"SEO,UEICES 15 l NA db J d uidd 7 89 50 LCSS CA DAMAGE TO FACui?
Type CESCnnt:CN
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7 99 10 60 PUEUCITY I
NA 17 7 89 i
l DOU VO(,')
60 ACCmCNAL FACTCA$
] l M-cunt of Activity-cent'd) tierceuries of I-131, 7.5 tierecuries of I-133 l
89 60 119 l l
7 89 60
Event Description, (cent'd):
hours that off-site power was not available.
This event similar to ER 77-055 (ER 77-058)
Cause Description (cont'd):
breaker 27-R8 nor the lov side breakers feeding the 2h00 and kl60 volt buses.
The 27-PS breaker vill trip from the transfor=er bank differential relays, and thermal trips for the feeder breakers have been retained. This scheme retains electrical fault protection, yet vill prevent plant trips fres spurious action of the 'R' bus stripping relay.
To deter =ine the source of the
'R' bus stripping signals, the 'h86 S-X relay has been instru=ented so that recorder traces can be obtained in the event future trips occur.
300069 l_
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