ML20090D519
| ML20090D519 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 07/21/1972 |
| From: | Schneider F NIAGARA MOHAWK POWER CORP. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20090D512 | List: |
| References | |
| NUDOCS 8303020113 | |
| Download: ML20090D519 (2) | |
Text
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NBAGARA MOHAWK POWER CORPORATION NtAGAR'A MOHAWK 300 ERIE BOULEVARD WEST SYRACUSE,N Y 13202 July 21, 1972 United States Atomic Energy Commission Division of Compliance, Region I Attention:
Mr. James P. O'Reilly Director 970 Broad Street Newark, New Jersey 07102
Dear Mr. O'Reilly:
1 Re:
Provisional Operating License:
DPR-17 Docket No.:
50-220 In your letter of June 22, 1972, you requested that we advise you of our plans and schedule for documentation of wall thickness on valves relating to nuclear safety within the reactor coolant pressure boundary.
The valves installed in the reactor coolant pressure boundary at Nine Mile Point Nuclear Station, Unit #1, as defined in subsection 50.55 (Codes and Standards) of 10 CFR 50, were designed and purchased under ASA B-31.1, B-16.5-1961, MSS-SP-66 and ASME Sections III and VIII. Those codes, at that time, did not require documentation of valve wall thickness although the valve manufacturer was required to design and cast the valve in accordance with the applicable code.
A comprehensive review of our records indicates that documentation of valve wall thickness was not included in the-manufacturing records furnished to Nine Mile Point, Unit #1.
In light of the above information, a program to obtain documentation of wall thickness of these valve bodies is being instituted.
The documentation of wall thickness of the affected valves will be the result of ultrasonic measurements of wall thickness, with comparison to specified minimum wall thickness.
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a Mr. Janes P. O'Reilly, Director Page 2 Division of Compliance The ultrasonic measurement technique will be demonstrated to have a maximum error in repeatability and accuracy of not more than 2*. and documented against a machine test block of the appropriate material and minimum wall thickness.
Minimum wall thickness documentation using the above technique will be accomplished over a three year period commencing with Spring 1973 annual outar.c. Approximately 26 valves can be documented during each annual outage resulting in complete documentation of the approximately 72 valves in three years.
Very traly yours,
,3 SAeh F. J. Schneider' Vice President - Operations FJS:pw
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