ML20079C640
| ML20079C640 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 06/18/1991 |
| From: | Woodard J ALABAMA POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-88-010, IEB-88-10, NUDOCS 9106240270 | |
| Download: ML20079C640 (6) | |
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/Milf hilllilh0WCf June 18, 1991 a s. '- m h [f t y, It 4
Docket Nos. 50-348 50-364 U. ",. Nuclear Regulatory Commission ATTH:
Document Control Desk Vashington, D. C. 20555 l
Joseph H. Farley Nuclear Plant Response to NRC Bulletin 88-10 Gentlemen:
l In a phone conversation between your Hr. Stephen T. !!offman and Mr. B. L. Moore of Alabama Power Company, questions concerning our response of November 6, 1989 to NRC Bulletin 88-10 were raised.
These questions vere centered on the hold-in test (test section 2.3 of Attachment 1 to NRC Bulletin 88-10) for a lleinemann Model AH2-A3-A molded case circuit breaker.
This circuit breaker passed the hold-in test at 95.3% of rated current instead l
of the required 100%.
Subsequent to this phone call a letter dated April 26, 1991 was received by Alabama Power Company requesting the folloving information for the lleinerann Model AM2-A3-A molded case circuit breaker in questions l
A.
Documentation, such as vendor ducriptions, indicating whether the breaker is of magnetic or magnetic and thermal design.
B.
Trip characteristic curves for the breaker.
C.
Excerpts from the Vyle test program which explain the rated current hold-in test and the basis for the deviation to test at 95.3% of rated current instead of at 100%.
l Attachments 1, 2, and 3 to this letter contain the information requested above.
l In addition, sheet 2 to attachment 3 includes the basis for the acceptability of the hold-in test value that Vyle used.
If you have any questions, please advise.
Respectfully submitted, khb esbd hb.Voodard l
JDV/CCMicht-91.8.10 Attachments cc:
Mr. S. D. Ebneter Mr. S. T. Hoffman
/[,.b j
Mr. G. F. Maxwell
/
9106240270 910618
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- M M CidlCK GUIDE TO HL N OVERCURRENT PROVECVION Precise Overload Protection -
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with Heinemann Hydraulic-Magnetic Circuit Breakers Hect induced Time delay eliminates breaker tripping nuisance tripping eliminated due to transient current surges Hememann hyd'avic magnetic circuit Ehmination of trar s'en' cu ent su ges as than 10 tees r+ veake, s f at'ng rNde i
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breakers pet three major ad.antages a cause of nasance tfcptng is accom-inpan'aneous respor se ( Aninsta'da+ ecup ovef thermat deras phshed through the creabon of a con-top breaket is a<adable for use on, for ma N day am wataw ea%E moden naal anc we i Ebmination of nusance troprng caused
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by high amb,ent temperatures in 0
or near the instaUa' ion The breaber ocCuts when the ea7pment,s first turned For added protechon, the t'me delay is fesponds onty to cunent wanations. not g
qp to temperature change seSadn,;tbng to amtaent temperatute g
conMons M high ambients = where the 2 Asrurance that 100% of the rated fn fact transen' overicads they usua9y oMad WWe d W WA 4 curreht M be caffed The'e is no pose no t%reat of damage to the hne of D*"# " "NY d * "* Dd such assurance wth thefmal devices, to the equcment 50 it is not recessary in M a % da @ d a t w tc and v.hich may fad to carry f ated cu' rent or even desif abie to intecupt the powet N wmay mWm is mereby when subpcted to at>c so-normal when they occu,
@oma N bh tevaw N amb'ent temperatures A Hememann e
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em a cowW % v b aow breaker 'ated at 20 A. for examse *di of a ann W e b m m m ca w sustam 20 A, even at eevated temper, peams Man wg wen atu'es Def abng and other forms of lessening overload protecbon The detay temperature compensation are is in er ely r ortional to the ( verload, v
m essay fesponse is cluicker cn large overicads, 3 Immediate reset Since there a'e no where greater poter.bal danger costs.
thermal elements, heat budo up is not and slone' en sma!! obefloads Encept in 8 factor The'efof e, no "Co@ng o'1' specia! highor'ush mode's heavy ovet-period 6 fequired a'ter 'aJ1 interruption load and short circuit cu' rents CJ g' eater The Hydraullc Magnetic Principle (How the breaker works) d f m o a.
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h 1 The Heinerrant hyd'3J c-reagne'c cif 0 git 2 Wtth estels:ve Currer,t "se magneto?ius 3 When tne r*agn(MC V reaches a p'e*
l breaker Opera'et Cuload Cu renPproduced forte inCfease$ puNng tne rf 00 CO'e ?O*a'd de'ermned gave, Se affnat/e 15 Stated r
reagnet>C4as wahab0ns in a so6en@d The the n"ra'Je end Of the tvDe Th45 Core tu the poie p+0e and the breaber tr,ps Coilis *OUM a'Ognd a herfrebCa9y $ea+d.
inserton feduce$ tre fehactance o' the (The break er f'ay top be' Ore the CD'e non magnebC fJbe Contaming a SDfing-magne!c CI'Cuit and f/the' intfea$e5 the feathes the p060 p<ece it the CfibCat ffus lOSded movable iron Core en a Speciah strerg'h of the magne'c f-eid The 50'00r81 value it ACheeved trs') On very heavy f
iQuid regulates the Cof pl Speed O travel OveMOad5 Of short Circeos the flus prodoted haJL fdl WTh the load Cunent either at or t
60'06 the b'eSile' S nominal f 8593 :he t'eakng a con'rOhed tr p Detay that is by the tod alor e re;;a $ess O' CD'e po$r ma7 ESC flus !$ vf nsu'icent streng'h F<e'se) pr;p3fhore !O the M8gnoJde Of bon as Ss"cen' to Dv l in the 3*atute i
i to move the Core. So it rema ns $1 the end the Overload l' t"e O<encad Sut% des TN5 CeCud thierf sp'cn OCCu'$ * "' no O r e IJDe ODEWe the a"* A!" e bete tre Co'e re& Pes tne f;Oie piece Wenhonat Oe ay - B bg% OeSesbie f
fte Core fe'#ms to it3 09nal poston and fespOaSe Charasensbc the tveake' 00e$ not tnD (FOf nOrkdeiat J
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Page No.1 10 Nctice of Acomcly No. 2 Test Repert No. 40799 1 J/N 40799 ATTACHMEllT 2 Page 3 ef 3 i
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Page No.19 Test Report No. 40799 1 ATTACl{ MENT 3 Sheet 1 of 2 N'ottee of Anomaly No. 2 J/N 40799 Page : of 3 DISPOSITION COhlhlENTS RECOhth1ENDATIONS (Continued).
2.
Specimen AP 40799 5 was allowed to cool for approximately 40 minutes. It was re-energized with 100% rated current (Run 2). In addition to the test setup shown in Figure 5 of WLTP 6110 6, Revision F, a hand held meter with 100 msee peak hold capability was used to monitor for any current transients.
The breaker tripped approximately 20 minutes into the test. No transients were noted; the peak reading on the hand held meter was 15.44 A (rated current is 15 A).
The specimen was allowed to cool for 21/2 hours. It was energized with 100% rated curret.t (Run 3). WLTP 6110 26 requires current to be maintained at 100% 2 % of 5
rated current.
For Run 3 of the Rated Current Hold in Test, the current was maintained at 97%
100% of rated current. The breaker tripped 18 minutes and 15 seconds into the test.
At the completion of Sections 2.5 through 2.7 of WLTP 6110 26, Run 4 of the Rated Current Hold in Test u as conducted. Current was maintained at 14.3 Amps (95.3% of rated current) throughout the test. The breaker held in for the required 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. The Rated Current Hold in Test was re performed at a lower current because the manufacturer's time current curve (see attached curve) shows that the breaker can trip in as little as 12 seconds at 100% current. Although Specimen AP 40799 5 does not meet the requirements of NRC Bulletin 8810 for the Rated Current Hold in Test, the four tests that have been performed demonstrate that the specimen performs in accordance with the manufacturer's specification,
o a
i Sheet 2 of 2 Basis For Acceptability Of Testing llold-In Current At 95.3% In Lou Of 100%
The manufacturer's time ciarrent curves indicate that at 100% of
- rated current the Heinemann breaker can trip in less time than the required one hour specified in NRC Dulletin 88-10 (as little as 20 seconds).
When Wyle realized this they reduced the current to a value that allowed Wyle to test the breaker to verify that the breaker would " hold-in" for one hour and thus meet the intent of the testing criteria outlined in NRC Bulletin 88-10.
This breaker was purchased as a spare for the Inadequate Core cooling Monitoring System (ICCMS) and, as shown by the Wyle test report, would function as intended by the manufacturer, if used as a replacement for the circuit breaker now in cervice.
The 95.3% value (14.3 amps) is much higher than the ICCMS equipment load _(less than 10 amps).
If installed, the breaker would never see a prolonged load of 100% of its rated current during the normal operation of the ICCMS equipment.
Therefore a one hour
" hold-in" at 100% current is not required for this breaker to perform its intended function.
If an increase in loading is ever needed, a design change and engineering evaluation would be required to determine the acceptability of the Heinemann breaker
- for the increased load.
Additionally this spare circuit breaker would not be used for other safety-related applications at FNP without a design change which would include an engineering evaluation-of the acceptability of the breaker, based on its electrical characteristics including its. time-current curve.
It is Alabama Power Company's position that the Wyle test proved that the-Heinemann breaker in question was not a counterfeit breaker since'it performed in accordance with the manufacturer'c published time current data.
l l
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