ML20084Q521
| ML20084Q521 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 04/02/1984 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Denise R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| LIC-84-086, LIC-84-86, NUDOCS 8405210328 | |
| Download: ML20084Q521 (2) | |
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Omaha Public Power District 1623 Harney Omaha. Nebraska 68102 402/536 4000 April 2, 1984 LIC-84-086 b
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Mr. Richard P.
Denise, Director Division of Resident, Reactor Project APR - 51984 and Engineering Programs U.
S. Nuclear Regulatory Commission (b
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Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011
Reference:
Docke t No. 50-285
Dear Mr. Denise:
Inservice Inspection (ISI) Plan 1973-1983 The Omaha Public Power District requests two exemptions from exami-nations required for the 1973-1983 ISI interval.
The first ex-emption request results from limited access to perform the exami-nation.
During the first ten-year interval, in 1975 and 1980, two-thirds of the reactor head-to-flange weld was examined per the applicable Section XI code.
Due to an oversight, the last third of this weld was not examined in 1983.
The code allows for one year beyond the end of the interval to complete any examinations I
scheduled but not completed.
Based on the results of the 1975 and 1980 inspections of the head-to-flange weld, the need for the fol-lowing exemption was established:
ASME Section XI Item Bl.30 l
Exemption:
The closure head-to-flange weld has physical ob-structions which limit the extent of the ultrasonic and surface examination.
Specifically, there are twelve seismic skirt mounting lugs, each six inches wide, located thirty-seven inches apart, evenly spaced around the examination area.
Thus, seventy-two inches of the head-to-flange weld cannot be examined due to this physical obstruction.
Also, due to interference f,
from the seismic skirt and the head flange, the ultra-f sonic scanning is limited to four inches either side of the head-to-flange weld.
This restricts the volume jy of the weld examination and, depending upon the angle
,y of the transducers used, may result in less than code l
required weld volume being examined.
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's-Mr. Richard P. Denise LIC-84-086 Page Two of 7-8 Rem /hr area and 10 Rem /hr surface have prohibit-ed access to perform'the ultrasonic testing from the inside surface of the head.
Therefore, a volumetric and surface examination will be done only on the ac-cessible portions of the closure head-to-flange weld.
The second request is to apply an exemption allowed in the Winter 1980 addenda of the Section XI code to the first ten-year exami-nation program.
Because the Summer 1975 addenda of the ASME Section XI code applied to the first ten-year program, this re-quest must be made.
Specifically, the District requests exemption from testing of Class 3 portions of the waste disposal system, as required by Article IWD of the ASME Section XI code.
Instead, the District wishes to follow paragraph (g) of Subarticle IWA-1300 which first appeared in the Winter 1979 addenda to the 1977 edi-tion of the Section XI code.
It has been determined that the safety criteria for the waste disposal system would permit this system to be non-nuclear safety class.
Therefore, the District will optionally classify this system as Class 3 and will continue to treat it as a critical quality element system for the purposes of repair, modification, and replacement.
These changes are also consistent with requests made ior the second ten-year ISI program.
Sincerely, L&V W. C.' Jones Division Manager Production Operations WCJ/DJM:jmm cc:
LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N.W.
Washington, D.C.
20036 Mr. Keith Jorgensen Hartford Steam Boiler Inspection
& Insurance Company 8319 Izard Omaha, Nebraska 68114 Mr.
E. G. Tourigny, Project Manager Mr.
L. A. Yandell, Senior Resident Inspector
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