ML19326C626
| ML19326C626 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 03/11/1980 |
| From: | Faulkenberry B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | |
| References | |
| PNO-V-80-017, PNO-V-80-17, NUDOCS 8004240286 | |
| Download: ML19326C626 (2) | |
Text
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M
.Y PRELIMINARY NOTIFICATION PRELIMIfMRY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-V: 80-17 Date:
March 11, i This preliminary notification constitutes EARLY notice of events _of_ POSSIBLE_
i safety or public __ interest significance.
The inforrration _pr_esented is as initially rcceived without verification or_ _ evaluation and is basically all that is known by IE staf f on this date.
Facility:
Sacramento Municipal Utility District Rancho Seco Nucicar Power Plant Sacramento, California Docket No. 50-312
Subject:
DAMAGE TO FUEL ASSEMBLY SPACER GRIDS AT RANCHO SECO The Senior Resident Inspector was informed that spacer grids on five Cycle 3 fuel assembli.
(FAs) were damaged during recent fuel movements performed as part of the Cycle 4 refuel-ing outage.
Video tapes and polaroid pictures of the damaged FAs indicated approximately 6.4 square inches of material was missing from the ' spacer grids and involving 14 separate pieces.
Vacuming of the lower and upper core areas has recovered about one-half of the ca terial.
The remaining material has not been located.
The cause of the damage was attri-buted to contact between the spacer grids on assemblies with " bowed" fuel and the spacer
- rids on adjacent assemblies during refueling operations.
The licensee stated that fuel
=aowing" has been experienced at Rancho Seco in the past.
In all cases B&W was made aware "of 'the problem by SMUD.
The five damaged assemblies have been returned to the core after analyses by the vendor (B&W) and the licensee's review comittees.
Regfon V informed IE:HQs and NRR of the above problem, via telephone, on March 10, 1980.
NRR has subsequently been in direct contact with licensee personnel and are currently evaluating the significance of the problem.
The Rancho Seco facility is currently in a cold shutdown condition for refueling operation-which were initiated on January 12, 1980.
A return to power operation is scheduled to conrience on March 21, 1980.
1 CONTACT:
B. Faulkenberry Distributiok:V%3-373frasmittedHSt Chairman Ahearne Comissioner Bradford S. J. Chilk, SECY c
Comissioner Kennedy Commissioner Hendrie C. C. Kammerer, CA Cornissioner Gilinsky ACRS (ForDistribution) i.
Transmitted: MNBB /O 8 M P Bldg // I 2 #
IE:X005 E'
(IE:HQ011 W. J. Dircks. E00 H. R. Denton, NRR C. M fchelson, AEDO R. C. DeYoung, NRR J. J. Fouchard, PA R. J. Mattson, NRR Landow _
_ (6 min /page)
W. M... Hall er, MPA D. Vassallo, NRR J. J. Comings, OIA
=3K.Shapar, ELD (g
"Other s, NHSSE k
gue, SD Regional Offices _
S. Levine, RES (Time) _
$OO92.N72d>
RV Fom 211
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)f-h80 PreliminaryNotification(Continued) i Region V was provided the above information by the Resident Inspector on March 10, 1980.
This infomation is current as of 11:00 AM PST on March 11, 1980.
Media inter 0st is not anticipated. A press release is not planned by the NRC at this time.
It is not known at this time if the Itcensee intends to issue a press release.
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