ML17266A216
| ML17266A216 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 06/11/1980 |
| From: | Wethy C FLORIDA POWER & LIGHT CO. |
| To: | |
| References | |
| NUDOCS 8006230405 | |
| Download: ML17266A216 (2) | |
Text
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,Offsite ADS> JRS, COP~ kfAS, REU~ lQOi TO: Hr.'. P. O'R'eilly, Director,'- Region II Office of Inspection and Enforcemont
, U. 8. Huclear Regulatory Co~ission
- Atlanta, GA 30303
- . PRO.f
Hr. C. H. Wethy, Plant kianager St'ucie Plant - DPR 67 Plorlda power 6 Light Company Hiani, Florida It should be noted that to open the CCI4 valve it was necessary to
~disable its contains.'ent isolation function.
Ho@ever, the reactor was already shut down and cooling damn (as zequired for an inoperable containment isolation valve).
Ther'e is s redundant operable CIS valve'n series vit1> the sub)ect valve {)ICV<<14-6) and the valve can be c3'.osad manually if needed in about 5 minutes or less.
Also based on previous experience with natural circulation cooldowns it was expected that it would require about 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> to reduce RCS te"perature below 200oP and such continued long loss of seal cooling could eventually cause failure of seal soft parts zesulting in potentially significant HCS leakage, I
Currently RCS leatage (possibly from the seals) has increased only about I/4 gpss.
The plant is on SCD and the seals willbe replaced.
r June 11, 1980
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NE!0 FOR FACSDIILE TRAIIQIISSIOif TO CONFIRH PRO~IPT
'@P Off3.cer REPORTABLE OCCURRENCE 335-80-29 g
~ C. Agog g>fs, r.en',o is to follow up zed phone notification of the subject event at 3:00 AII on 6/ll/80 and telephone notification to Hr.'S. Elrod at 3:30 A<I, gt 2:26 AH a serious ground occurred on lB DG bus causing a containment isolation valve for CCI4 (slCV-14-6) from the RCP seal coolers to fail, closed (as designed)'.'s required by procedure (and the peap vendor) the RCP's were turned off within 10 minutes af loss of seal. cooling and following a uanual z'eactor trip from about 94X power ak 2:34 AH. )lat>>ral '"
circulation.cooldown was commenced.
After 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 24 minutes the closed valve was reopened.
Based on prior experience with loss of seal coali coo (see LER-335-77-23) it is expected that the seals have experienced suffici nt damage to require replaceaent and it is not prudent to run the RCP's (although there is no current. indication of significant leakage).
Therefore the natural circulation cooldowiw
$s continuini~.
RCS temperature wax 290o" at, 9:GO--AK-but pressuremas 490. psia and SDC requires c 300 psia.
The plant was on SDC at ll:07.
80O6g 3 Oqcq-
4 Mgpl
%he ground was Sn solenoid for Che aS.r opera CV7 va1ve.
The~<
apparent cause is Mater in the solenoid frow a steam:leek'in th>>
~ vicix~ity. further infonootioq.v443 ha provid>>d in the.LEE.
~gW C.
$1. L/~thy, Plant:
ager St. Lucia Plant QH7(L'fP:cc
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