ML20086L526
| ML20086L526 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 03/12/1974 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086L524 | List: |
| References | |
| AO-74-9, NUDOCS 8402080294 | |
| Download: ML20086L526 (2) | |
Text
Peach lbtton Ato:dcDroworMe n
m Do3ta, Pennsylvania 2d n
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, g. 0 hk March 12, 1974 l
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Xr. Ja.v.es P. O'Eeilly, Director l
rnited Statec Ator.ic Energy Co::=ission Mrectorate of Regulatory Operationn QA Ttri: Avenue Eing of Prcenia, Pennsylvania 10406 fubject :
Abnorm 10:entrence 24-Mour !!otiff ention Cor,firr. ins ny convercation with Kr. R. A. Teil, A.E.C. Region.1 Regulatory Operations Office on March 12,3974.
Eeference:
Licenr.e Kunber IM 44, A:::endeent flunber 1, 'Icchniesl Spe-ifiestion
[c is'epori ho.:
50-277-74-9 P.eference Tab)e 4.2.B hport Dr.te:
3/32/74 0:currence Date:
}/13/74 heility:
Pcoch Potton Ato.wie Power Station Unit 2 R. D.1,141ta, Pennsylvania 37314 i
3dentification of Occurrence:
Conta:te of rehy 2LKB, of the autontic deprecturinstion syste:*,
in11ed to clo.9e per decign intent during surveilltmco tecting of the "E" nutonstic depreccurication systen logic.
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Conditiono Prior to Occurrer.cei Reactor operatir.g at appror. ira.tely 2% power. 7ho high prescure coolant. injection synte:> vas inoptrable.
z Description of Occurrenco:
j After detemining that the high pret:sure coolant injection system vos inoperablo, testing vs.c performd on the automtio deproce.trization oystem in accordance with Technical Specification 4 5 0.2.
'No.
rart:any opcn contacto of rehq 2LKS fni. led to close when ceded Vpon to do no. 'ihe coil of thic relay is connected directly acrocs the "L" 125-volt d.c. bus which cupplies the nort:a1 power to the sycte.n's r
t
'%" logic.
If a power failure on the "B" but occurs, the relay do-energiros, twa nore. ally open contacts cloce, and power in transferre:i 4
J to the "A" 125-volt d.c. bus. Tocco contacto failed to close upo::,-
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simulatin;; a power feihre on the "B" buc.
c.l Designation of Apparent Cauce of Occurrence:
the IG'A type
' W@bbdsfM)$ tact stuck l
A spring lonied firepr contact on tho 3 f06Pc'S il rehy was found to be eticking in the
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.in the cloning direction. it would preront, tinother contact fro:a closing.
If the contact stuck-in the opening recgig..g{ggvouldnotclose.-
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Analynia of Occurrenect 1
Tnc auto q"7.eprensurimtion system in d,c:;igned ruch-that no 9
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ningle fui u c. such t.o the ono jue decer g d,. con render the j
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nyste.,.ir.cpertible.. Even if a povor. failure on.the "B" buo occurred, and the "L'" Icgic group van not capablo.of cvapping l
- l over to the otber power buc, a redundant.Iogic group "A" povered from the "A" bun, would c
- 113. Le capablo of. initiating the automatic l[)
depreccurimtior. system.
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I Corrective i.ction:
She oticking relay finger contact von adjusted co that it cloced.
'croner3y.. Tae entire reluy.nrnture was replaced and reteated
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durir.g the reactor chutdovu followir.g the-loan of-power terc on Vll/74.
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Very truly yeuro.
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f R. 3. Fleir.c'r.:r. ann. II Accietant 5tperir.tendent Peach Ectta Ato:nic Power. Station-e e
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