ML20084D435
| ML20084D435 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 04/17/1974 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084D330 | List: |
| References | |
| NUDOCS 8304110206 | |
| Download: ML20084D435 (3) | |
Text
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FLORIDA POWER & LIGHT COMPANY April 17, 1974 l
Mr. Angelo Giambusso Deputy Director for Reactor Projects Directorate of Licensing Office of Regulation U. S. Atomic Energy Commission Washington, D. C.
20545
Dear Mr. Giambusso:
TURKEY POINT UNIT NO. 4 DOCKET NUMBER 50-251 REINSPECTION OF SAFETY RELATED HYDRAULIC PIPE RESTRAINTS INACCESSIBLE DURING REACTOR OPERATION The reinspection of hydraulic pipe restrnints in accordance with the continuing requirenonts of the Directorate of Licensing letter of November 8, 1973, was completed on April 3, 1974.
A total of 50 restraints were inspected and all except one were found to be operable.
The restraint judged to be inoperable con-tained a hydraulic fluid level below the minimum indicated icvel.
This restraint was located in the pressurizer compartment and is a Bergen-Paterson Model No. HSSA-10-6.
Disassembly of the restraint showed that the cause of the fluid loss was the ineffective sealing of the main piston rod packing.
The two pieces that comprise the packing assembly were found to have separated, resulting in a degradation of the packing's sealing function.
This restraint was replaced with a spare unit containing ethylone propylene seals.
This was the first inspection conducted subsequent to rebuilding the Unit No. 4 restraintsawith the ethylene propylene seal material.
Examination of the seals from the inoperable restraint showed no evidence of deterioration of the seal material.
The separation of the main piston rod packing is believed to have been a random event related to the reassembly of the restraint.
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COPY SENr IEGION H E LPIN G BUILO FLORID A
1 Mr. Angolo Gio asso Pcgo 2 2
April 17, 1974 l
u A sumunary of the radiation and temperature environment for the restraints is provided in the attached Table.
Ve truly yours,
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'R. E. Uhrig Director of Nuclear A fairs REU/11NP/kmw cc:
Mr. Norman C. Moseley Mr. Jack R. Newman 1
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TABLE NO. 1 SANARY OF TIMPERATURE AND RADIATI(N ENVIR0tNENT 1U1 SAFETY REIATED RESTRAINTS INACGEIBLE IURING RFACTOR OPERATION Radiation in Area' Temperatures Restraint incation No. at Incation of Rostraints of Restraint at 100% Pauer i
1.
Top of Pressurizer Compart-18
<150F
<1(R/hr)
)
i ment 2.
Just below the containment 7
<120F
<1(R/hr) operating floor; just cut-side the pressurizer cam-l Partment 9
<120F
<1(R/hr)
I 3.
Operating floor in the vicinity of the steam generators j
4.
Imwor elevation of Reactor 16
<120F
=40(R/hr)"
contahnt (14 ft. elev.)
l inside the reactor coolant loop compartment l
1 i
4 i
- This number was determined by utilizing TID's located on the restraints closest to the reactor coolant loop.
This radiation field is representative of a maximum and should also be used in place of restraint radiation enrircument data previously submitted for Unit No. 3.
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