ML20008D841
| ML20008D841 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 10/08/1980 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 8010230241 | |
| Download: ML20008D841 (3) | |
Text
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- pa nt%9'o, UNITED STATES a
[ I,cc g
NUCLEAR REGULATORY COMMISSION OA
'. C WASHING TON, D. C. 20555
- ?'lL.
o, OCT 8 1930 l
l Docket Nos.: 50-369 l
and 50-370 i
i Duke Power Company ATTN: Mr. William O. Parker, Jr.
Vice President - Steam Production l
i Post Office Box 33189 l
422 South Church Street l
Charlotte, North Carolina 28242
Dear Mr. Parker:
l l
Subject:
UHI Holddown Assembly Springs j
(McGuire Nuclear Station, Units 1 and 2) l l
We have recently learned of the detection of some cracked and broken holddown assembly springs in a foreign UHI plant. Since this matter may effect the McGuire plant, we request that you provide us with the information described in the attachment. This matter was previously discussed with your staff in mid-September.
In order to promptly conclude this review matter, we request that you provide the information no later October 15, 1980.
Sincerely, d4?
Robert L. gdesco, Assistant Director 3
for Licensing Division of Licensing l
Attachment:
Holddown Assembly Springs Question cc:
See next page l
&010230 D k
i 4
Mr. William O. Parker, Jr.
Vice President Steam Preduction Duke Power Comp,any P. O. 803 2178 422 South Church Street Charlotte,' North Carolina 28242
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cc: Mr. W. L. Porter-Duke Power Company David. Flesichaker, Esq.
P. O. Box 2178 1735 ' Eye Street, N. W.
Suite 709 422 South Church Street Washington, D. C.
20006 Charlotte, North Carolina 28242 Mr. R. S. Howard Richard P. Wilson, Esq.
Power Systems Division Assistant Attorney General State of South Caroliina Westinghouse Electric Corporation 2600 Bull Street P. O. Box 355 Columbia, South Carolina 29201 Pittsburgh, Pennsylvania 15230 Mr. E. J. Keith Office of Intergovernmental Relations EDS *iuclear Incor:: orated 116 West Jones Street 220 Montgomery St,eet Raleigh, North Carolina 27f>03 San Francisco, California 94104 County Manager of Mecklenburg County Mr. J. E. Houghtaling 720 East Fourth Street NUS Corporation Charlotte, North Carolina 28202 2536 Countryside Boulevard Clearwater, Florida 33515 U. S. Environmental Protection Agency ATTH:
EIS Coordinator Mr. Jesse L. Riley, President Region IV Office The Carelina Environmental Study Grcup 345 Courtland Street. N. W.
854 Henley Place Atlanta, Georgia 30308 Charlotte, North Carolina 28207 Mr. Tom Donat J. Michael McGarry,'III, Esq.
Resident Inscector McGuire NPS c/o USNRC Debevoise & Liberman 1200 Seventeenth Street, M. W.
Post Office Box 216 Cornelius, North Carolina 28031 Washington, D. C.
20036 Rober t M. Lazo, Esq., Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Cormission W. ashington, D. C.
20555 Dr. Emmeth A. Luebke Atomic Safety and Licensing Board U. S. Nuclear Regulatory Comission Washington, D.-C.
20555 Dr. Cadet H. Hand, Jr., Director
. Bodega Marine Lab of California P. 0. Box-247 Bodega Bay, California 94923
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Holddown Assembly Spring Question We have learned that during the first cycle refueling of a foreign VHI reactor, visual inspections of the fuel assemblies revealed several damaged coil springs in the holddown assemblies used to retain non-fuel bearing components; viz., burnable poisons, neutron sources, and plugging devices.
It is our understanding that this holddown assembly spring design is unique to Upper Head Injection plants and that McGuire has springs that are identical to those that were damaged in the foreign UHI plant. Therefore, if you intend to operate McGuire with those springs, please provide us with your assessment of.(a) the potential for broken springs and (b) the consequences of operation with broken springs.
In your analysis of potential consequences you should include, but not necessarily be limited to, addressing the following effects:
1.
Loose parts being released to the system.
2.
Vibratory wear resulting from un-restrained components.
3.
Other failures resulting from vibration (burnable poison rods, etc.)
4.
Loss of spring load resulting in axial displacement of core components that could affect (a) change in thimble by-pass ficws (b) change in pressure drcp, (c) axial repositioning of burnable poisons, and (d) reduction in UHI inlet flow area.
1 Your assessment should either provide the rationale for your conclusion that operation with the current spring design does not constitute a " substantial safety hazard" (10 CFR 21) or violation of "specified acceptable fuel design
,, limits" (10 CFR 50, appendix A General Design Criteria 10), or if the springs are to be replaced with other springs of different design, you should describe the differences and discuss the adequacy of the substitutes.
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