ML18227A467
| ML18227A467 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 03/21/1975 |
| From: | Schmidt A Florida Power & Light Co |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18227A467 (8) | |
Text
~ REPORT OF ABNORMAL OGGURRENGE AND/OR INGIDENI'RC D
RIBUTION FOR PART 50 DOCKE TERIAL (TEMPORARY FO RM)
CONTROL NO'ILE INCIDENT REPORT FILE FROM Florida Powder 6 Light Co Miami, Fla, A D S hmidt TO'dson G. Case DATE OF DOC 3-21>>75 ORIG 1 signed DATE R EC'D 3~25~75 CC OTHER LTR TWX
ENCLOSURES:
DOCKET NO:
50-251 Ltro reporting Abnormal Occurrence 8 75-4 trans the followingo Turkey Point 84 PLANT NAME:.
Lateral Restraints for Spent Fuel Racks
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P.O. BOX 3100 MIAMI,FLORIDA 33101 OP%
b'4 FLORIDA POWER 8L LIGHT COMPANY March 21 Mr. Edson G. Case, Acting Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Case:
ABNORMAL OCCURRENCE NO. 251-75-4 OCCURRENCE DATE:
MARCH 12, 1975 TURKEY POINT UNIT NO.
4 LATERAL RESTRAINTS FOR SPENT FUEL RA'CKS'ROKEN A.
CONDITIONS PRIOR TO OCCURRENCE Unit No.
4 was at steady-state power operation at 99% rated power.
The Unit No.
4 spent fuel pool was drained and being cleaned in preparation for the first refueling.
B.
DESCRIPTION OF OCCURRENCE During the spent fuel pool cleaning on March 6, 1975, it was found that one of the 116 stainless steel seismic restraint springs (see Sketches No.
1 and 2) on the spent fuel racks had broken into two pieces and was lying on the pool floor.
The re-maining springs were all noted to be in place.
- However, a more careful examination of each of the remaining 115 springs was completed on March 12, 1975 and revealed that 5 additional springs were similarly broken, but were held in place by the nuts used to fasten the spring to the stud used for preloading the spring (see Sketch No. 1).
C.
DESIGNATION OF APPARENT CAUSE OF OCCURRENCE The investigation to date has not conclusively determined the cause of the broken springs.
One of the broken springs has been sent to a laboratory for metallurgical analysis, but the results are not, yet available.
D.
ANALYSIS OF OCCURRENCE The springs provide restraint for the spent fuel racks in the event of a seismic event.
Inasmuch as there was no spent fuel in the Unit No.
4 spent fuel pool, the broken springs clearly presented no nuclear safety problem, and posed no potential danger to the public health and safety.
3ivJ HELPING BUILD FLORIDA
Mr. Edson G. Case, Acting Director Page Two March 21, 1975 E.
CORRECTIVE ACTION The broken springs will be replaced with new springs of the same functional design.
A supplement to this report will be issued in the event that additional corrective action is required as a result of the continuing investigation.
f P.
FAILURE DATA There has been one other instance of a broken spring at the Turkey Point Plant.
On March 10,
- 1975, one of the 116 springs installed in Unit No.
3 spent fuel pool was found to have broken.
The springs are manufactured by Unistrut Corporation,
- Wayne, Michigan, and are designated as part number 115792.
Very truly yours, D. Schmidt Vice President Power Resources HNP/cpc cc:
Mr. Norman C. Moseley Jack R.
Newman, Esquire
I
'OP OF POOL STAINLESS STEEL SPRING (USED FOR LATERAL RESTRAINT OF FUEL RACKS),.
HORIZONTAL MEMBER OF SPENT FUEL RACK SPENT FUEL POOL WALL STUD AND NUTS USED FOR PRELOADING,OF SPRING BOTTOM OF POOL P
SPRING INSTALLATION IN TURKEY POINT SPENT FUEL POOL SKETCH NO.
1
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4a
FRACTURE LINE
, STAINLESS STEEL SPRING USED FOR LATERAL RESTRAINT OF SPENT FUEL RACKS AT TURKEY POINT PLANT SKETCH NO.
2
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