ML17286A527
| ML17286A527 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/24/1990 |
| From: | Eng P Office of Nuclear Reactor Regulation |
| To: | Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| References | |
| IEB-90-002, IEB-90-2, TAC-76354, NUDOCS 9101020341 | |
| Download: ML17286A527 (6) | |
Text
Docket No. 50-397 Mr. G.
C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System 3000 George Washington Way P.O.Box 968
- Richland, Washington 99352
Dear Mr. Sorensen:
December 24, 1990
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING NRC BULLETIN 90-02, "LOSS OF THERMAL MARGIN CAUSED BY CHANNEL BOX BOll" (TAC NO. 76354)
On March 20, 1990, the NRC issued Bulletin 90-02, "Loss of Thermal Margin Caused By Channel Box Bow," to all boiling water reactor licensees.
The bulletin requested that licensees who are reusing channel boxes verify that current critical power ratio (CPR) technical specification operating and safety limits are met.
All affected licensees were also requested to advise the NRC of the number of such channel boxes and their disposition in the 'core.
Licensees were also requested to describe the methods and associated data base used to account for the effects of channel box bow during reuse of channel boxes to ensure conformance with the CPR limits.
By letters dated April 13, 1990 (G02-90-075) and September 28, 1990 (G02-90-162),
you provided your response to the bulletin.
During our revies( of your responses, we identified the need for additional information from you.
Specific questions are listed on the enclosure.
We would appreciate receiving the requested information as it becomes available.
Should you have any questions, please contact me.
This request for information affects fewer than 10 respondents; therefore, OMB clearance is not required under Public Law 96-511.
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Cy AnO UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 December 24, 1990 Docket No. 50-397 Mr. G.
C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System 3000 George Washington Way P.O.Box 968 Richland, Washington 99352
Dear Mr. Sorensen:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING NRC BULLETIN 90 02~
LOSS OF THERMAL MARGIN CAUSED BY CHANNEL BOX BOW (TAC NO. 76354)
On March 20, 1990, the NRC issued Bulletin 90-02, "Loss of Thermal Margin Caused By Channel Box Bow," to all boiling water reactor licensees.
The bulletin requested that licensees who are reusing channel boxes verify that current critical power ratio (CPR) technical specification operating and safety limits are met.
All affected licensees were also requested to advise the NRC of the nuriIber GT such channel boxes and their disposition in the core.
Licensees were also requested to describe the methods and associated data base used to account for the effects of channel box bow during reuse of channel boxes to ensure conformance with the CPR limits.
I>y letters dated April 13, 1990 (G02-90-075) and September 28, 1990 (G02-90-162),
you provided your response to the bulletin.
During our review of your responses, we identified the need for additional information from you.
Specific questions are listed on the enclosure.
We would appreciate receiving the requested information as it becomes available.
Should you have any questions, please contact me.
This request for information affects fewer than 10 respondents; therefore, OMB clearance is not required under Public Law 96-511.
Since y,
Enclosure:
As stated Patricia L. Eng, Pro ect Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation cc w/enclosure:
See next page
Mr. G. C. Sorensen Washington Public Power Supply System WPPSS Nuclear Project No. 2 (WNP-2)
CC:
Mr. J.
W. Baker WNP-2 Plant Manager Washington Public Power Supply System P.O.
Box 968, MD 927M Richland, Washington 99352 G. E. C. Doupe, Esq.
Washington Public Power Supply System 3000 George Washington Way P. 0.
Box 968 Richland, Washington 99532 Mr. R. G. Waldo, Chairman Energy Facility Site Evaluation Council Mail Stop PY-11 Olympia, Washington 98504 Mr. Alan G. Hosier, Licensing Manager Washington Public Power Supply System P. 0.
Box 968, MD 956B Richland, Washington 99352 Mr. A. Lee Oxsen, Acting Managing Director for Operations Washington Public Power Supply System P. 0. Box 968, MD 1023 Richland, Washington 99352 Mr. Gary D. Bouchey, Director Licensing and Assurance Washington Public Power Supply System P. 0. Box 968, MD 280 Richland, Washington 99352 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite'210 Walnut Creek, California 94596 Chairman Benton County Board of Commissioners P. 0.
Box 190
- Prosser, Washington 99350-0190 Mr. R. C. Sorensen U. S. Nuclear Regulatory Commission P. 0.
Box 69 Richland, Washington 99352 Nicholas S. Reynolds, Esq.
Winston 5 Strawn 1400 L Street, N.W.
Washington, D.C.
20005-3502
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RE(UESTED INFORMATION REGARDING WNP-2 CYCLE 7 OPERATION WITH REUSED CHANNELS 1.
The number of channels scheduled to be reused in cycle 7.
2.
Please provide the following for each channel scheduled for reuse in cycle 7:
a.
Planned location coordinates for cycle 7 for each channel.
b.
Whether any of the channels scheduled to be reused in cycle 7 will be located adjacent to new fuel assemblies.
c.
Whether any of the reused channels will be adjacent to a 1 imiting bundle during cycle 7.
d.
Discuss the estimated exposure and maximum calculated channel bow for each channel reused in cycle 7 (using the Supply System Analytical Model).
Items a through c may be provided on a core map.
3.
Discuss how the anticipated maximum channel bow will affect the following parameters during cycle 7:
a.
MCPR operating limit b.
MCPR safety limit