ML17037C129
| ML17037C129 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/16/1972 |
| From: | Perkins T Niagara Mohawk Power Corp |
| To: | Skovholt D US Atomic Energy Commission (AEC) |
| References | |
| Download: ML17037C129 (4) | |
Text
AEC DI ~
UTXON FOR PART 0 DOCKET MATE TEMPORARY FORMi CoiVTROL Nol 4653
'ROM:
Niagara Mohawk Power Corp Lycoming, N.Y.
13093 T.J. Perkins TO ~
Mr. Donald J. Skovholt CLASS:
OP INFO DATE OF Doc:
8-16-72 ORIG 1 signed XNPUT DATE REC'D 8-23-72 CC No CXS REC'D 5
FX LTR MEMO 'PT OTHER SENT AEC PDR SENT LOCAL PDR DOCKET No:
50-220 DESQRIPTIONl Ltr rpt during the annual inspe tion outage of Nine Mile Pt. Station Unit I, a"problem was found with the electromat relief valve was discovered
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IIEGUIATORV
)I MAlL SECTION QOOIIEI'LERK Nine Mile Point Nuclear Station P. 0.
Box '32
- Lycoming, New York 13093 August 16, 1972 A MOHAWKPOWER CORPORATION O~
GARA MOHAWK Mr. Donald J. Skovholt Assistant Director for Reactor Operations Division of Reactor Licensing United St'ates Atomic Energy Commission Washington, D.
C.
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Dear Mr. Skovholt:
Re:
Provisional Operating License DPR-17 Docket No.:. 50-220 During the annual inspection outage of Nine Mile Point Nuclear Station, Unit ¹1 this past spring, a problem with the electromatic relief valve was discovered and a letter dated June 2, 1972, forwarded.;,to your office.
In this letter a repair to all six valves was outlined ivhich
'ould improve the dependability of valve operation.
In effect, the repair was to remove the locking screw and lock retainer plate and in their place cut four 1/4" V grooves, 1" long in the joint between the disc retainer and the valve body inser't and stitch weld them together.
(See enclosed drawi.ng).
Electromatic valve ¹112 on which the disc retainer had backed out and was found in the bottom of the valve body had>sustained damage to the disc retainer threads and valve body threads.
A new disc retainer was 'purchased, installed and stitch -welded along the valve body disc re-tainer joint.
However, the testing of this valve following maintenance revealed that leakage was develop'ed past the disc retainer into Chamber A
from Chamber C.
This would be the result of damage to the valve body threads.
It was.then deemed necessary to seal weld instead of stitch weld the entire joint between the disc retainer and the valve body to insure no leakage and dependable operation of the valve, Subsequent testing showed the valve fully operable.
Very truly yours, 7
T. J.
Perkins Station Superintendent
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