ML20090E165
| ML20090E165 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 11/27/1974 |
| From: | Schneider R NIAGARA MOHAWK POWER CORP. |
| To: | Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| 12148, AO-50-220-74-14, NUDOCS 8303110611 | |
| Download: ML20090E165 (5) | |
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NIAGARA MOHAWK POWER CORPORATION NIAGAitA MOHAWK 300 ERIE BOULEVARC. WEST 50-220 SYRACU$E. N Y.13202 November 27, 2974 (k'QN Mt. Donald J. Skovltolt N
Assistant Ditestor for Reactor Operations
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Division of Reactor Licensing O'
0 United Shttes Atenic Enetgy Commissicn h'asitington, D.C.
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Dear Mt. Skovltolt:
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"N in accordance teltl1 tize Teclinical Specifications fo 'b '
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tite Mine Mile Point Nuelear Station, Unit H1, tire enclosed Abnormat Occwtrence is subnLtted.
Tite report is ist tiie fomnat detailed in Regulatety Guide 1. 6 6 Rev. '1.
Vert) Ltutt) yours, La
, R.R. Sclineide,t Vice President Electtic Operations TJ0lmn Enc.
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NIAGARA MOHAWK POWER CORPORATION
- NIAGARA MOHAWK-NINE MILE POINT - J.A. FITZPATRICK t
1.
Report No.
50-220/74-14 2a.
Date November 21, 1974 2b.
Occurrence Date November 20, 1974 3.
Facility NY NMP # 1 4.
Identification of Occurrence Failure to perform required surveillance frequency on battery tests. Specification 4.6.3b.
5.
Condition Prior to Occurrence During the period the unit was operated at a peak load of 1830 mwt,-
i this lond was maintained until October when a pattern swap at low power was completed and reactor power decreased to 0,
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6.
Description of Occurrence During nianagement review of monthly surveillance tests,.-it was found -
4 that the station batteries were not tested as required by specification 4.6.3b. (Specific gravity of each cell on monthly _ basis). The October.
readings were taken on November 5, the July readings on August 1 and i
the September readings on Gctober 2.
The~ maximum time between tests occurred between 8/26 and 10/2, 37 days ~.
l 7.
Designation of Apparent Cause of the Occurrence Misinterpretation of the requirements as:related by Operations Department to the Maintenance Department.
8.
Analysis of Occurrence'
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The station battery, two independent systems, is:used as~a power source for breaker operation and instrumentation.and control.
Certain plant emergency systems (lighting; bearing oil pumps, etc.)
are powered from the battery, in the event of loss of AC power.
The battery, therefore, could prevent _ serious.cquipment ' damage L
and-excessive maintenance. The : monthly checks of J he. battery are
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t provided to assure that all cells wi11' satisfactorily handle full--
rated current if necessary..By_ extending thefsurveillance frequency.
to.37 days in one case does not reduce the; capability of the-system to function as required, however, it does complicate the process-of'
. logically determining whether or'notia trendablel discharge is in
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t' progress.- ' Pilot ~ cells are checked.'each day and the battery is-floating'across:a battery charger which~'would< maintain.the' battery?
~in fulltreadiness.
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Continued During review of the. test no degradation of the cell's was noted, r
therefore, no hazard would have been presented the general public.
9.
Corrective Action The maintenance foreman was notified of the requirement for monthly tests.
In addition, management controls in this area of surveillance testing are being reviewed and methods are.being evaluated.
A.
change will be made to assure that this event does not happen again.
10.
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NIAGAHA MOHAV[tC POWER CORPOR
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p.c art I:o, 50 220/74-14 2a.
Drto 11-21-74 2b.
Oceny ence Dste 11-20-74 3.
_!'e.cility W I;G' #1 4.
1(hatifier.tf an of Ocettrernee Pr.ilure to perfont required survoillence frequency on battery tests.
S;:c;;ificctica 4,0.;b.
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pm Mr. n prW vn o.~m nenea Durin': tha perica the unit una operated at a pech load of 10"O in.t, Giu Ictd esa r::intnin:d until October uhen a pattern:
tutp ct it'.t p.:q uan ccupleted end reactor potec; decrenced to 0.
6.
Ur ce,Mirn n" c e tercreo Durina canca, :ent rcvint of c:,nthly cttrroillnneo tects, it tas found thet the etct:en batteries Ucro not tested oc rce,uired by crecific tion 4.v45. (Cp:Ofic cravit'/ of cach coll en r.cathly basic). m October reed".nga ucre-tchen ca 1:0Vcabor 5, the July rendings on 11.u mst cnd the Septe-ber readinas en Cotober 2.
Tho neximics tino between tests o :rxrc6 b:;tucen C/20 cn210/2, 37 dcys.
7.
Iw.innnti m of A w are: _ce no ne tim c.crrr.?nco Micinternrctctic t of the requirencnta cc related by Opt,rt:tions d:pn=tt=nt to the Ibintenen00 departncnt.
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Lo~1vr.!r.<< Cecurwrco h etttica bnttery, tua ind:ptndent cyctens, is u:04 cn a peuer ccurco for tarechur c;cration end inctre:cntation cnd centrol.
Certain picnt aeracncy cystens(lightina, bearin3 oil p;cys, etc.)
nro pcuored frcn the bettery, in tho.'cVc:it of loss of AC poucr..
h bat.tcry, tht..v fero, coull prevent cericus cc.uip2cnt den 30 cud cnce nive raintennnec.
The conthly checho of the battery cro provided to ncou o thnt cil co112 will ::tinfootorily lendio full-rc.te ' crwent if n0coccc.ry.
Dy extendin?. the nurveillenco fre.quency to 3'1 (:yn.in cac car.o dess not reduco the c pnbility of the systea to functica ca rec.uired, he: rover,. It does cor.911csto the proccas of Ic:1culiy Ccte? inir : vhuther or not a tecnd.blo diccherr:o is in prearces.
Pile? celh: c: ch. ned cac's Gny cud the be.ttery in ficatina ccrons c.
bnt ecry. chtrntr t:hich uculd enintcin..the b::ttery..in.ful? re:dinoss.
F.:rina rovh :1 of the test no dern(ation of tho co11:2 p.:.s toted, thrv.? fero,'na ha:ord uculd havo bcea proce.ited to-tho central public.
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Corre ct h' ' t.<
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h raint'.:r.:e ferr' un vas notifie d of the requircatat for nenthLy at ec c:als in thfa c= a of curvo111c.nco test:
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testit-a cro b ina rcvit.<t J nn i s.:ctneds nro boin?. cvaluated. A chan.o still h. -Ao to accuro that this tvtat docs not br.,7en ocain.
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