ML20086D692

AO 73-16:on 730612,during Severe Electrical Storm in Which Direct Lightning Strike to Top of Plant Ventilation Stack Observed,Detonation in Offgas Sys Caused Sufficient Back Pressure to Fracture Air Rejector Rupture Disc

ML20086D692
Person / Time
Site:	Vermont Yankee
Issue date:	06/13/1973
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086D688	List: ML20086D686 ML20086D692
References
AO-73-16, VYV-2716, NUDOCS 8312020450
Download: ML20086D692 (3)

Text

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, i T.0 i 6. A N i i s .i i;M o;; r 0 % O1 y g y. j ; th P. O. Di* 1G7 VL NNON Vi 'N ! Dill DM id Jtme 13.1973 Uoit ed 'lt 01 en /.t o:aic 1:ncr te Coit d of;lon Directorate of 1:enolat ery Operat ions, Ucnion T ,,

f 910 h) omi St ret t 3 dNork, .M u Joleev 07102 i 13:1Ttl5 CP. . Operatiop, Licence DPn-20 Daciet No. 50-271 '

i Abnorral Occuriente Eo, AO- / 3- 3 6

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,% defined by lechnioni 0,pe cifi cations f or the Vci atr.nt Ynnl:cc i Hunlenr Pwer St ation , Section 6.7.A.e, we are reporting the folioving Abn o ma'l Occurrence m; AO-73-16, nud cont'ir uing out telephoae l

convernation with your of f$ ce.

I At 1750 on .lunt 12, 19 73, dur ing a severe electrical f.Lora in which

.. di)ett 11thLninh nLril;e to the top of the plant ventflotjon otsch una

<>hrenr ved , a pinnt .s t a r.L gar. n. uni t or i n h r;; u t en , and the a tea gaima radiction tunitor on the peritaeter lence, becmae inoperab)e. Since thf r.

innt ruwntation is teouited at all tites as a Lir.itjng Condition for Opernt i on by Tncl.ni cal Cpecif ict. Lions Section 3.8.A.1, nu orderly pinnt shutdtr 'n v;u; init inted.

Concurrently wit.h 1.he above loun of Jhulruwentation. an 6Dporent detonation lu the Ofi-gao Systelo cauced suf fj edent hnet prennurn to f rort ure the air c.jertor rupturn disc, t'.icrchy degrading a boundary desigund t.u cont.ain radioactive raLeriulu as defined in 'lechnical Specillcotions Sectica 1.A.S.

'1he cauce of the inst rument twlf unction and npparcut detonation in believed to hnve been the li ghtning r.t.rike. Thin tc.L of nature reuulted in the iol.lo..'Jun event u which occurred encentially pir.ultnocously:

1, In t er ir: off-nan nys;t,cin tripped oil due t.o lot, t: of power 2, St a c1; gan tonitoxing nyct ea I tripped of f

3. Arca gnr.sa nouitor at pericet.cr icate inoperable

4. Oli-gw 11oa indicator on CIT 9-6 inopersble

5. Pancinra nycteu on C10' 9-6 and 9-7 inoperoble (apprnrinately 100 cards involved)

6. Air ejector tuptute dioc Iractured 8312020450 730622 PDR ADOCK 05000271 S PDR E

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- \ \ \ ; .1 1.( , .s ' ' ! 3 P ,, p 9 P ri tir to thin I n i. J .! u t the p1;.nt enu opa 41 ' tif, nort.nli , a t. 12pp7 o; i) % ely 70% p a ra e r vit h t he Int eilu oli g; r. .;y r. t e v. in per viv ,

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! l'ollo d un the int idrot , t ei.pornr y T eps,t i c uer e u:d>> to the inpture I

cIist- t a t i n ) ) ,1 ;'. t . egi,coun 1.in ioart iv (1 y jts t } p., 'j (!t ls iaiQ buildiny,. nit

{ oi.t .p t r es tilin in the ai r e lect ^r loNu of,tbe Turbine Building indicated

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Ir:n nut,)e y.e ,.t. t i v i t y ni 11. 4 'o 10 p C i / c e . *1 h i- 'lurbinn bn!; ding 2001 ltin w s 4 Lere e l Oped af, t h e* f. i t s.- til the i n c j t.1:e n t , 'j )n) bl.uth G;es b a rt o t J u.e. :.y n t r 2 I r.'. T e t u rn e d t o c e l e.i t e itt .1035, n.d the pi r ji t er -

f a or. .. .11tnr leutoted to optu.:l:J.in at 20.10; houever, react or pu,'er vvp l l

I u l 1.h e r i c d u r e d i o ?f)2 n t- shout /035, and tht' i c r e t 'll VO9 cobp.let c].y Ah ol d U,3f t (, t. 03$3 on Jbrin 13, l t)7 3, s

P tll i lit L' 11 V e.'.L j);atM o n hnd OVIrltmllon of ppL).ih3 e Am9 age TeUUltihg 1:ou the i n c i den t .i. n currently un<ir rvay , l:e ce r e al.y lepalte mad ter.t Inn a t'e p i e r.e n t } y its p rOr,re n n an d ,a j, J an t u t sti f Dp in cor.teLpinled thit:

O \'e n i t i f, .

Very truly yous n ,

VCitMET YAhTF.F. };llCLl;/d! l'O;lTE CORP 011ATHN n,

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l'Innt Superintendent hM9/l'bd t ____ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ . _ _ _ _ _ - - - _ _ _ _ _ _ _ - . _ . _ _ _ _ ___

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Chief, F:ie .h , RO ' ' " AF'2EMAL D'L.Rai MCC 73 16 Tho at t ac.imd report from the subject ifcenace in s o :rn .. s w. u.m n , una cc no:lly (5) foruarded in accordance with RO Manual Chapter b 6 I1ea l>R Cent ral Filet mc 1000. The action taken by the licennec is con-l< e g . St andardr, ( '.O Dir o f_f,1 c. .rm .i ,v (g) :idered nppropriatr. A npocial in"pection is

< < r. c .e c. a w u m.t.u s e om.-

~ - . . . - . . _ - . - -umletway to review the circumstancea of this event.-

wt A pro _ posed ' Blue Sheet" was sent to your_ office _by_

facainile on 6/14/73. Copies of the report bave

, w u c..,o..na r o um r.s

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been forwarded to the - - . .PDR,

. . + - - . . Local YDR, NSIC, DTIE

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(. nnd State representatives. The licensee will submit R. T. Carlson, RO:I a 10 day written report to Licensing.

PHW.f. fVI, LATE 6/15/73  :=N, UM Uf hD4 SIDE FOR ADi f f D'4 AL f1LV ARP,5 Clu i 147 8 O . 44b est a

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