ML19308E109
| ML19308E109 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 06/30/1972 |
| From: | Jennifer Davis US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Rodgers J FLORIDA POWER CORP. |
| References | |
| NUDOCS 8003200831 | |
| Download: ML19308E109 (3) | |
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-2 3: m DIRECTORATE OF REGULATORY OPERATIONS In Reply Refer To:
June 30,1972 RO:II:JGD 50-302 Florida Power Corporation Attn:
Mr. J. T. Rodgers, Assistant Vice President and Nuclear Project Manager 101 Fifth Street South P. O. Box 14042 St. Petersburg, Florida 33733 Gentlemen:
This letter relates to your reactor Crystal River Unit 3.
Information obtained during inspections conducted by the Directorate of Regulatory Operations, has disclosed that a number of facilities have been equipped with valves with wall thicknesses below the minimum requirements specified by the applicable codes, standards and procurement specifications.
In' other instances, licensees have not bees able to document whether or not their valves met minimum wall thickness requirements. Our. survey of this subject has disclosed that the matter is not limited to any class of licensee or valve supplier.
In light of the above information, you are requested to verify, through manufacturing records or other suitable means, that valves important to nuclear safety installed or to be installed at your facility meet
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the min'imum wall thickness requirements of the specified codes or standards.
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To the extent that verification records are currently available, you are requested to promptly accumulate those records at the plant site, and to advise this office within thirty (30) days of the date of this letter, of what records are available and when our inspector may examine them at the plant site.
200 fQ f7
Florida Power Corporation June 30, 1972.
In the event that records are not currently available, you are requested to advise this office within thirty (30) days, of your plans and schedules for de: nstrating by suitable alternate means, that valves important to nuclear safety installed or to be installed at your facility are acceptabte with respect to wall thickness.
Records of conformance shall be maintained curra with insp4 ctions performed.
The valves which req ire demonstration of acceptable wall thickness are
_ _the following:
1 Each valve within the reactor coolant pressure boundary, as defined in subsection 50.55(e) (Codes and Standards) of 10 CFR 50, where the valve is:
(a) over 1-inch neednal pipe size for pressurized water reacte rs; (b) over 1 1/4-inch nominal pipe size in water lines for boiling water reactors; (c) over 21/2-inch nominal pipe size in steam lines for boiling water reactors.
The following techniques are considered to be a sufficient demonstration of ageeptabic wall thickness. Alternate techniques cay _bc offered, but there is no assurance that they will be found acceptable:
(1) Documented direct physical measurement of actual wall thickness, with comparison to specified minimum wall thickness.
(2) Documented results of ultrasonic measurement of wall
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thickness, with comparison to specified minimum wall thickness, and documentation that' the ultrasonic measure-ment technique is demonstrated to have a maximum error in repeatability and accuracy, of not more than 2% of the wall thickness.
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Florida Power Corporation June 30,1972 (3) Wall thicknesses,. verified by e'ither of the above techniques, to be not less than 90% of specified minimum wall thickness will be acceptable, provided that the documented mechanical characteristics of the material exceed the specification minimum by an amount
' sufficient to compensate for the measured rr. duction in wall thickr'ss.
(4) "Specified Minimum Wall Thickness" as L;ed above, means the wall thickness required by the relevant codes and standards (e.g., ASA B31.1 (1955); USAS B31.1.0 (1967);
USAS B16.5; 15S-SP-66) in effect on the date of the purchase order.
(5) Certain of your valves may have, for procurement convenience, been ordered to ratings higher than actually required by service conditions, in such instances, you may, if you wish, provide for our review, an engineering justification for accepting valves which do not conform to procurement specifi-cations, but do, in your opinion, satisfy service requirements. Such justification should be promptly transmitted to this office, in ten (10) copies.
(6) In certain instances, you may wish to repair valves found to have wall thickness below the specified minimum.
In such instances you are requested to provide to th'.a office for our review, the proposed repair procedure, including a description of techniques to be used to verify the acceptability of the repaired components. Such a proposed procedure should also be submitt,ed in ten (10) copies.
Acceptable documentation of conformance with the above requirements must be completed within three (3) years of the date of this letter.
Very truly yours, ay
.,.i John G. Davis Director
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