ML18227A462
| ML18227A462 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 05/01/1975 |
| From: | Schmidt A Florida Power & Light Co |
| To: | Rusche B Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18227A462 (7) | |
Text
NRC
'RIOUTION FOR PART 50 DOCKFT~>ATERIAL (TEMPORARY FORM)
CONTROL NO:
FILE
>~C>DEME REPORT FLP ORIG l Sigsned CC OTHER TO:
Benard C. Rusche FRQM FJ.orida Power & Light: Co, DATE OF DOC
~ DATE REC'D 1Rami, Fla.
5-l-75 5-6-75
~~~ah'WXRPT OTHER SENT AEC PD SENT LOCAL PDR CLASS UNCLASS DESCRIPTION:
PROP INFO INPUT NO CYS REC'D ENCLOSURES:
DOCKET NO:
50-251 Ltr. reporting Abnorm, Occurr.
fr 75-6, on 4-22-75c, concerning Breach of Containment Tntegrity During Refueling Operationsoo.,o
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DOCKBfD Ij5)I!)9 LORIDA POWER & LIGHT COMPANY 15ay 1, 1975 Mr. Benard C.
- Rusche, Director Office of Nuclear Reactor Regulatio U. S.
Nuclear Regulatory, Commission +i Washington, D. C.
20555
Dear Mr. Rusche:
CO A'BNORMAL OCCURRENCE."NO.,251-.75-6 MAY 1, 1975 OCCURRENCE DATE: APRIL 22, 1975 TURKEY POINT UNXT NO.
"4 BREACH OF CONTAINMENT INTEGRITY DURING REFUELING OPERATXONS A.
CONDITIONS PRIOR TO OCCURRENCE The reactor was in refueling shutdown condition, reactor coolant temperature was approximately 105 F and the reactor vessel head was removed.
The refueling cavity and the refueling canal were filled with borated water with a boron concentration of 2,180 ppm.
All requirements for refueling operations were satisfied and movement of a fuel assembly from the spent fuel pit to the reactor core was in progress.
B.
DESCRXPTXON OF OCCURRENCE Safety valve number RV-4-1403, located outside containment, was disassembled by maintenance personnel on April 22, 1975.
The safety valve seating surface was being lapped with a lapping block.
About the same time, maintenance personnel inside containment were removing steam generator No.
4A secondary side manway.
When the lapping block was removed from the safety valve
- seat, about ll:45 A.M., April 22,
- 1975, a mixture of air and water vapor was observed escaping from the safety valve.
Maintenance personnel notified the operators of this condition.
Xmmediate operator action was to verify the main steam line valve alignment to determine the source of the air and water mixture.
The valve line-up was verified to be correct so it was concluded that the air and water mixture had been trapped in the horizontal section of the main steam line after the main steam valves were closed.
About the same time, operating personnel inside containment found that steam generator No.
4A secondary side man-way had been removed.
As soon as it was recognized that containment integrity had been breached by a flow path through the secondary
- system, the nuclear plant supervisor ordered refueling operations stopped at 12:30 P.M., April 22, 1975.
4882 HELPING BUILD FLORIDA
I
Mr. Benard C.
- Rusche, Director Page Two May 1, 1975 Steam generator No.
4A secondary side manway was reinstalled and containment integrity reestablished before refueling operations resumed.
C.
DESXGNATXON OF APPARENT CAUSE OF OCCURRENCE After review, analysis, and evaluation,. we concluded.that.
procedure deficiencies were the cause of this occurrence.
Procedures involved did not require that containment integrity through the secondary must be established and maintained during refueling operations.
D.
ANALYSXS OF OCCURRENCE During this occurrence, fuel handling operations were conducted under water with special fuel handling equipment.
Continuous monitoring of reactor core conditions, containment environment gaseous and particulate
- samples, and background radiation levels would have detected off-normal conditions.
Fuel handling incidents are analyzed and presented in the Turkey Point Unit Nos.
3 and 4 Final Safety Analysis Report,(FSAR) using conservative assumptions.
The inventory of noble gas radionuclides and the predominant halogen,radionuclides in a fuel assembly were evaluated and presented in the FSAR assuming 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> for radioactive decay.
At the time of this occurrence, the reactor had been subcritical about 520 hours0.00602 days <br />0.144 hours <br />8.597884e-4 weeks <br />1.9786e-4 months <br />.
Xf a fuel handling incident had occurred, the'inventory of noble gas radionuclides available for release from a fuel assembly would have been reduced by a factor of nine by radioactive decay.
Similarly, the halogen radionuclides would have been reduced by a factor of seven.
Therefore, the calculated exposures presented in the FSAR would be reduced by the same ratios.
From the review, analyses, and evaluation of conditions during this occurrence, we concluded that neither reactor safety nor the health 'and safety of the public were jeopardized by this occurrence.
E.
CORRECTXVE ACTXON Adminstrative and maintenance procedures will be revised to specify that secondary system integrity must be established and maintained when maintenance work on secondary systems is performed during refueling operations.
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Mr. Benard C. Rusche, Director Page Three May 1, 1975 F.
FAILURE DATA This is the first abnormal occurrence report from Turkey Point Unit Nos.
3 and 4 involving breach 'of containment integrity during refueling operations.
Very truly yours, D/CB~
Vice President Power Resources VTC/dfl cc:
Mr. Norman C. Moseley Jack R.
Newman, Esquire
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