ML19282D029

RO 269/7827 on 781214:on 781213,reactor Coolant Temp Became Erratic.Feedwater Problem Resulted from Operation of One or More Feedwater Valves.Power Cords Have Been Fitted

ML19282D029
Person / Time
Site:	Oconee
Issue date:	01/15/1979
From:	DUKE POWER CO.
To:
References
FOIA-79-98 NUDOCS 7905110017
Download: ML19282D029 (2)

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DUKE ?CW 2. COMPA.',"?

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CCC..- .. s 1ere-- Number- 10-269/7317

e or: Ca:e: Ja uary 15, 1979

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Occurrence Oa:e: Dece_ber 14, 1973 racili:v: Ccenae i.*ni: 1. Seneca, Scu:h Carolina

!fentificati:n ef Occurrence: ES Ac:ua:icn Folleving Reac:0: Trip Candi:icns ? tor to Occurrence: 93.". Full ?:ver Descrietien Of Cecurrence:

A: appro:ciza:ely llCO hou:s on Dece ber 13,1973, :he Reac:or Coolan:

Syste: average :e:pera:ure (Tave) s:stala = beca:e erra:1 and a work request :o investigate was issued. On December 14, 1978 during inves:-

igation of the erra:1: statalar= behavior a short occurred on the power cord feeding :he ICS Tave recorder. The sher: caused an erroneous low

! ave 1: dica: ion of approxi=a:ely 13 F. The ICS began vi:hdravi g cen::el

d group 7 :s sai=:ais Tave. The reactor ::1pped oc high pressure /:e:p-era:ure a: 1636 hours0.0189 days <br />0.454 hours <br />0.00271 weeks <br />6.22498e-4 months <br />. Both mor=al feedva:er pu=ps : ripped en high discharge ;; essure. The emergency feedva:er pu=p s:arted, : hen s:cpped when :he nor:a1 feedvater pu=ps rese: a:d restarted. By app cx1=atelf 1638 hours0.019 days <br />0.455 hours <br />0.00271 weeks <br />6.23259e-4 months <br /> :he level in :he GTSO's had dropped :o 6 and 0 inches respec-

ively ( c =al level is ,= ore :han 110 inches) . The e=ergency feedva:ce pu=p started to feed :he 3 ge= era or. Levels in :he A genera:or returned

o nor=al by 1641 hours0.019 days <br />0.456 hours <br />0.00271 weeks <br />6.244005e-4 months <br /> bu: :he 3 ge: era:or increased :o 35 inches and

hen re:ur:ed :o 0. This possibly resul:ed fro: malfunc:1o:ing of valves required for this particular flev path. The 3 ge ers:o vas refilled through the e=ergency feedva:ar header at 1649 hours0.0191 days <br />0.458 hours <br />0.00273 weeks <br />6.274445e-4 months <br />. ES Channels 1 and 2 (High Pressure :jection) ::1pped en lov RCS pressure (if 00 psig) as required by Technical Specifica: ices.

A:carent Cause of Occurrence:

7:e IS ac:ua:ed en lov ICS pressure due :o inabill:y :o 21::21: ieedva:e fl:v :o :he 0"SG's sufficies: :o =si=tain adequa:e s:artup level. !"ne feedva:e p qblems evidently resul:ed f::= imp;cper opera: ion of one or more Tecdva:c valves (FDW-46, -47)~1nvolvec in svi::hing f := nor= 1 ::

emergency fl:V pa:hs. Tne ini:iating even:, :he shor: in :he T've a rec :ders

ove

.::d, was apparently an isola:ed failure.

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Anal- s af Occurrence:

S.e heal:h and saie:7 of : e general public vere not adverse ; _.fec:ed as a resui: :f :his :c:urrence. 3c:h :ne 1?S and IS sys:e:s fune:i:ced

s required.

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THIS DOCUMENT CONTAINS POOR QUAUTY PAGES n05110@

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The ;c.er :::ds tha: su: ply :he Tave rece:ders en Cai:s 2 and 3 hase

. been inspected and f:und :o be in acceptacle endi:icn.

The petan:ially =alfunc:icning valves , 70'a*-4 7, -43 vill be :hcrcu;hl -

checked during a la:e: cutage. Further review of :he i= pact of :ha

ansien: en :he OTSG's is also bei g perfor:ed.

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