ML20033B204
| ML20033B204 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 10/30/1981 |
| From: | Houston M Office of Nuclear Reactor Regulation |
| To: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| References | |
| NUDOCS 8112010028 | |
| Download: ML20033B204 (5) | |
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NUCLEAR REGULAlGa r,qr,17,11SSIOf6 g/
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D cket File NRC PDR-OCT 3 01981' LB#2 Local PDR Docket Nos. 50-440 DEisenhut/RPurple NSIC and 50-441 RTedesco TERA-ASchwencer TIC DHouston ACRS (16)
MService Mr. Dalwyn R. Davidson OELD.
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Vice President - Engineering I&E (3)
The Cleveland Electric Illuminating Company 8
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Dear Mr. Davidson:
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Subject:
Resolution of Channel Box Deflection Issue for Near-Te$n Y
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In several recent BWR SERs, including La Salle, Shoreham, Susquehanna, Zimmer, Fermi-2 and Grand Gulf, Channel Box Deflection was identified as an issue that required further information to be ' submitted prior to the second cycle of operation.
In a recent amendment (No. 76) to the Zimmer FSAR, the applicant has proposed several steps (see attachment 1) that could be taken to miti-gate the consequences of channel bowing. The proposed actions should mitigate the consequences of channel bowing and provide the required assurance that channel bowing will not be a problem in Zimmer Unit _1 as concluded in a recent supplement to the Zimmer SER (see attachment 2).
A commitment to a similar plan for each of the other plants named above, as well as the LRG-II plants, including Clinton, WNP-2, River Band and Perry, is proposed to close out this issue.
If you require any clarification of this matter, please contact me at (301) 492-8430.
Sincerely,
'hv.!2a AG,/.
n M. Dean Houston, Project Manager Licensing Branch No. 2 Division of Licensing
Enclosure:
As stated i
8112010028 811030 CC: 'See next page PDR ADOCK 05000440 A
PDR-
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ouey NRC FORM 318 (10-80) NRCM O24o OFFICIAL RECORD COPY uso m ini-m wo ;
OCT 3 01981 Mr. Dalwyn R. Davidson Vice President, Engineering The Cleveland Electric Illuminating Company P. O. Box 5000 Cleveland, Ohio 44101 cc: Gerald Charnoff, Esq.
Shaw, Pittman, Potts & Trowbridge 1800 M Street, N. W.
Washingtcn, D. C. 20006 Donald H. Hauser, Esq.
The Cleveland Electric Illuminating Company 4
P. O. Box 5000 Cleveland, Ohio 44101
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Rasident Inspector's Office U.S.N.R.C.
Parmly at Center Road Perry, Ohio 44081 Donald T. Ezzone, Esq.
Assistant Prosecuting Attorney 105 Main Street Lake County Adninistration Center Painesville, Ohio 44077 Tod J. Kenney 228 South College, Apt. A Bowling Green, Ohio 43402 Daniel D. Wilt Wegman, Hesiler & Vanderberg 7301 Chippewa Road, Suite 102 Brecksville, Ohio 44141 Robert Alexander OCRE Interim Representative 2030 Portsmouth Street Suite 2 l
Houston Texas 77098 i
Terry Lodge, Esq.
915 Spitzer Building l
Toledo, Ohio 43604 i
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........y 4.2.3.5 Status of'SER Confirmatory Items-Channel Box Deflection The following general guidelines are exercised to mitigate the consequences of channel bowing, i
a.
Records are kept of channel location and exposure for each operating cycle.
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Channels.should not reside in the outer row of the core for'more than two operating, cycles.
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At the beginning of each fuel cycle, the combined outer' row residence time for any two channels in any control rod cell should not exceed four peripheral cycles.
r Prior to beginchg a new operating cycle, control rod drive friction I
tests shall be performed for those core " cells exceeding the above general guidelines or containing fuel channel's with exposures greater than 30,000 Ed/T (associated fuel bundle exp~osures).
In lieu"of friction testing,. fuel channel deflection measuremenIs may be used to justify use of fu'el channels exceedini 30,000 Wd/T exposure for a mar.icum of four additional operating cycles.
In the future, anal tical channel lifeti=e predictica =ethods, bench-j narked and backed up by periodic deflection mear :re=ents of a sanple of the highest duty fuel channels, may be used to ensure clearance between control rod klades and fuel channels without additional testing.
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, - ;p I,. 2.3.5 Channel Box Deflection Channel box. bulge ds a re'sult of in-reactor creep, which if a?. lowed to
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proceed unchecked, could eventually create an interference between the control blade and the fuel channelsj In a General Electric generic report, NEDE-21354, ;
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.:cn _ channel. box mechanical. design and-deflection [L..GE describes a chaiinelfe A.'.d
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lifetime prediction method and a backup recomendation for periodic channel reasure=e,nts which consi7st of settli.ng friction tests.
The.settl.i.n'g friction
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. tests would provide an exact control rod drive friction vers'us position profile by measuring the hydraulic pressure under the drive piston as the drive " settles" to a latch position.
In F.evision 76 to the FSAR, 'the appl'icant proposed several steps that would be taken to mitigate the, consequences of channel bowing, including.the following:
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1.
Prior to beginning a new operating cycle, control rod drive friction tests shall be performed for those core cells exceeding specified general guidelines or containing fuei channels with exposures greater l
than 30,000 r/Jd/T. (associated fuel bundle exposures).
...EP 2.
In lieu of friction testing, fuel channei deflection measurements may i
l be used to justify use of fuel channeis exceeding 30,000 mwd /T exposure I
for a maximum of four additional operating cycles.
3.
In the future, analytical channel lifetime prediction methods, bench-marked and backed up by periodic deflection measurements of a sample
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of the highest duty' fuel channels, may be used to ensure clearance between ' control rod blades and fuel channels without additional testing.
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ti me. While the review of the GE generic report, NE00--21354, _
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completed, we agree with the applicant that the proposed ' actions. should'.!~ St5
=itigate the consequences of channel bowing and Inat they provide reason-able assurance that channel bowing will not be a problem in Zimmer Unit 1.
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Shculd our continuing generic review of tnis phenomenon (and the' GE report) reveal that a modification to the proposed steps is necessary, the licensee pili,te informed to take ap'propriate' action.
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