ML20203H501
| ML20203H501 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 02/20/1998 |
| From: | Muench R WOLF CREEK NUCLEAR OPERATING CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| ET-98-0006, ET-98-6, IEB-96-001, IEB-96-1, NUDOCS 9803030246 | |
| Download: ML20203H501 (2) | |
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LF CREEK W@ NUCLEAR OPERATING CORP R6 chard A Muench Vee President Engineenng February ?0, 1998 ET 98-0006 U. S. Nuclear Regulatory Commission ATTli Docurrent Cuntrol Desk Mail Station P1-137 Washington, D. C.
205S5 References 1)
URC Dulletin 96-01, " Control Rod Insertion Problems,"
dated October 7, 1996 2)
Proposed Supplement 1 to NRC Bulletin 96-01, " Control Rod Insertion Problems," (62 Federal Register 27629) lubject:
Docket No, to-481:
Control Rod Drop Test Data Gentlemen:
Refesrence 1 request ed licensees to measure and evaluate, at each outage of sufficient duration during calendar year 1996, the control rod drop times and rod recoil data for all control rods.
In Reference 2 tne NRC proposed end-of-cycle testing for control rods in fuel assembly locations having burnups greater than 40,000 MWD /MTU, if the fuel assembly design included Intermediate Flow Mixing (1FM) grids.
Wolf Creek Nuclear Operating Corporation perfotaed rod drop testing on October 4,
1997, during a refueling outage, on all rodded assemblies evith burnuo near or greater than 40,000 MWD /MTU, All rods exhibited recoil and none of the rod drop traces indicated any signs of excessive drag.
Rod drop times and associated assembly burnup data for the tested rodded assemblies are provided in the Attachment.
These control rods were drag tested in the spent fuel pool.
The maximum observed drag force in the dashpot region and the thimble tube region are provided in the attachment.
This information is being provided on a voluntary basis, and is not an NRC Bulletin 96-01 required response.
If you have any questions concerning this response, please contact me at (316) 364-8831, extension 4034, or Mr. Richard D.
Flannigan at extension 4500.
Very truly yours, 9803030246 900220
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Attachment to ET 98-0006 I' age 1 of 1 Rod Test and Assembly Burnup Data for the October 4,1997 Rod Drop and Drag Tests Assembly Max Drag Max Drag Rod Core Burnup Drop Time Force (Ibf)
Force (Ibf)
Bank Coordinates (MWD /MTU)
(seconds)
Dashpot Thimble CBD D4 40599 1.558 48 5
M12 40698 1.558 36 5
D12 40481 1.595 53 21 M4 40879 1,574 43 5
H8 32911-1.589 28 8
SBE H4 39751 1.544 53 4
08 39767 1.598 58 20 H12 39431 1.569 43 8
MB 39881 1.552 33 3
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