ML19345F759
| ML19345F759 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/05/1981 |
| From: | Murphy C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| Shared Package | |
| ML19345F760 | List: |
| References | |
| NUDOCS 8102190228 | |
| Download: ML19345F759 (1) | |
See also: IR 05000328/1980022
Text
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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101 MARIETTA ST., N.W., SulTE 3100
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REGION 11
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FEB 0 51981
In Reply Refer To:
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Tennessee Valley Authority
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ATTN:
H. G. Parris
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Manager of Po*er
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Gentlemen:
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Thank you for your letter of January 25, 1981, informing us of stepr4ycLa'
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taken to correct the item of violation concerning activities under fiRC
Construction Permit No. CPPR-73 brought to yeur attention in our letter of
January 2, 1981.
We will examine your corrective actions and plans during
subsequert inspections.
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We appreciate your cooperation with us.
Sincerely,
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Charles E. Murphy, Chief
Reactor Construction and Engineering
Support Branch
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G. G. Stack. Project
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Manager
J. M. Ballentine, Plant
Superintendent
J. F. Cox, Supervisor,
Nuclear Licensing Section
M. J. Burzynski, Project
Engineer
H. N. Culver, Chief, Nuclear
Safety Review Staff
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400 Chestnut Street Tower II
January 26, 1,981 " , -
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Mr. James P. O'Reilly, Director
Office of Inspection and Enforcement
U.S. Nuclear Regulatory Cc::ission
Regicn II - Suite 3100
101 Marietta Street
Atlanta, Georgia 30303
Dear Mr. O'Reilly:
SEQUOYAH NUCLEAR PLANT UNIT 2 - NBC-0IE INSPECTION REPORT 50-328/80-22 -
RESPC"SE TO VIOLATION 328/80-22-01
The subject letter dated January 2,
1981, cited TVA with a Severity Level V
Violatien in accordance with 10 CFR 2.201.
Enclosed is cur response.
If you have any questions, please get in touch with D. L. L::bert at
FTS 657-2581.
Very truly yours,
TENNESSEE VALLEY AUTHORITY
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L. M. Mills, Manager
Nuclear Regulation and Safety
Cyorn to and subscribed before ce
this 2 I
day of
1981
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Notary Public
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My Commission Expires #M ' 5 'l
Enclosure
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Mr. Victor St.ello, Director (Enclosure)
Office of Inspection and Enforcement
U.S. Nuclear degulatory Commission
'4ashington, DC 20555
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ENCLOSURE
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SEQUOYAH NUCLEAR PLANT UNIT 2
NRC INSPECTION REPORT 328/80-22
RESPONSF TO SEVERITY LEVEL V VIOLATION 328/80-22-01
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Severity Level V Violation 328/80-22-01
10CFR50.55(a), paragraph (d), as implemented by TVA's FSAR, Table
3 2-4, requires in part,
. . piping which is part of the reactor
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coolant pressure boundary shall teet the require ents set forth in .
. the Class I section of the USA Standard Code for Pressure Piping
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(USAS 531.7)
." Paragraph 1-727.4.2(c) of B31.7 states, "When
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cc:penents of different outside diameters are welded together, there
shall be a gradual transition between the two surfaces." In addition,
paragraph 1-721.4.2(d) stater, "The finished surface of the weld shall
=erge s:cothly into the Ocapenent surface."
Centrary to the above, several reacter coolant pressure boundary
piping welds do not blend saccthly into the adjacent valve neccle.
Admission er Denial of Violation
The unacceptable welding, as described in the subject inspection
report, occurred as stated.
Reascn for Violation
The subject violaticn occurred as a result of the failure to comply
with the Class I section of the USA Standard Code for Pressure Piping,
paragraph 1-727.4.2(c) of B31.7
Corrective Steps Which Have Been Taken and Results Achieved
Repair procedures have been initiated for the unacceptable welds (2RX
00064, 00065, 00057, 00058).
Corrective Step: Which Have Been Taken to Avoid Further Noncumpliance
All welding inspectors have been reinstructed in the requirements
pertaining to transition welds blending smoothly into adjacent base
metal with a 3-to-1 taper.
An additional sampling of similar
valve-to-pipe transition welds will be conducted to determine if there
are other welds that do not have the required 3-to-1 transition, and
any that are found to be unacceptable will be repaired.
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Date When Full Ccepliance Will Be Achieved
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Reinstructicn fer the welding inspectors has been co=pleted, and all
required weld repair will be completed by April 1,
1981.
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