ML22132A043
| ML22132A043 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 05/12/2022 |
| From: | Boyce M Wolf Creek |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 22-0009 | |
| Download: ML22132A043 (2) | |
Text
P.O. Box 411 l Burlington, KS 66839 l 620-364-8831 Michael T. Boyce Vice President Engineering May 12, 2022 ET 22-0009 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
Reference:
Letter ET 22-0003, dated April 6, 2022, from M. T. Boyce, WCNOC, to USNRC
Subject:
Docket No. 50-482: Withdrawal of 10 CFR 50.55a Request I4R-09, Relief from Examination of Reactor Vessel Flange Threads Commissioners and Staff:
The purpose of this submittal is to withdraw Wolf Creek Nuclear Operating Corporation (WCNOC) 10 CFR 50.55a Request originally provided by the Reference. The Reference transmitted 10 CFR 50.55a Request I4R-09 for an alternative to the requirement of the American Society of Mechanical Engineers (ASME) Code,Section XI, Examination Category B-G-1, Item Number B6.40, Threads in Flange, to perform ultrasonic examinations of threads in reactor pressure vessel closure flange connections every inservice inspection (ISI) interval. Nuclear Regulatory Commission (NRC) Regulatory Guide (RG) 1.147, Revision 20 was effective as of April 4, 2022.
In this revision, ASME Section XI Code Case N-864 was conditionally approved by the NRC.
Code Case N-864 allows that reactor pressure vessel threads in flange examinations be performed in at least every third 10-year ISI interval. The conditions include that monitoring and maintenance activities must be performed and documented to monitor the condition of the reactor pressure vessel threads in flange for signs of degradation and to mitigate any degradation that occurs. WCNOC plans to evaluate the use of this Code Case and implement appropriate necessary actions to meet these conditions. Therefore, WCNOC is withdrawing the proposed request and is no longer seeking NRC review and approval of I4R-09.
ET 22-0009 Page 2 of 2 This letter contains no commitments. If you have any questions concerning this matter, please contact me at (620) 364-8831 x8687, or Ron Benham at (620) 364-4204.
Sincerely, Michael T. Boyce MTB/rlt cc:
S. S. Lee (NRC)
S. A. Morris, (NRC)
G. E. Werner (NRC)
Senior Resident Inspector (NRC)