ML17252A852
| ML17252A852 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 01/31/1974 |
| From: | Cobean W Con Edison, Consolidated Edison Co of New York |
| To: | O'Reilly J US Atomic Energy Commission (AEC) |
| References | |
| Download: ML17252A852 (1) | |
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lndi~n F*o.int Unit No. 2 Af.C-Dc.n::kt'! l l~t). 50- 24 7 Mr
- J arne s 'P
- Q 1
- He i 11 y, Dire ctr) r R~gulatory Oper~tionE, Megion I
- u. S. l\\tomic EntJ.rgy Cc)ff!l'i1) ;:;::;ion
(\\~ 1 Park A\\F(~riue Fae i l i ty Op~i*f.iting LiC~Tl~t!
DI*'l\\-26 A.0.-4-2-6 King of Prussia, P~nnsylvania 19406 On January 25, 1974 th0 reactor was hrou9ht Griti6al prep~ratory*
t.c1 pl ac in9 tt~r:: plant ba.ck in sc;.rvice fol 1-owing cc)mpl ~ti on* of re*
p~_ire aesocdat.ed wi.t.h
~~he NO"JL-miber 13, 1973 fe1:.dwa.ter linl': brea:k incident.,
critit~ality w.:-t~ *"c:hieve.d with the 11 C::" banl-'. of ct'>ntrr,1 rods 45 step:.; withdrm*m from th(~ <::ore.* Tl1e criti.c_':'~l-pc1eitions
~f the control rod~ w~re approxirn~telY 27 steps below the in&cr-t.ion Ii.mite ehown on P.ig,_1_t'.c':_ 3.10-1 of the Tcc::hriicill 8pecificj~
tions.
At th~ time of the ocG~~rence tho reactor coolant. system
~.t.**~asure and lempc:t**i1ture wer.~ 2235 p:;.~g. and
~,4QOJ:~ resper.tively with ~l l. fc.1u-T r(':actor G~lli ant pump~ in se;:ivj ('!~ and the borc,n con-ccntra tion wis~ 112[i ppm boron.
Th~ 27
~.tcp di~t;~rr-:ntial repre-scnt.e a dcr:i.:-rea~e in the rt-quired shutc.~_1)wr1 mi'\\rg-; n of ~bi.>\\)t 0. 2-6't, re:activi ty.
Minimum boron c.-:oric.e:ntrat.1on req1.1.ire:d to maint~ln the
~*~quired $hutdown margin (Pi9ure 3, t0-3 of t.h0. 'l'echnit;al Speci..-
f ic~tion.e) is i;-alcul.-,tc:-:d to be 77 Ci ppm.
Therefc,rc~ 1 the * ~hutdown l\\\\lU'gin <<t the timt! of the 0Gc.:1~:i:-Yence. waF.
conc.ic.~c~L"ably more th~-~)
that required by Figure J.l0a3, We tlre inv~.etig~t.l.ng thG c.:::sut:t:s of this OGGux*rt!nce. "nd corrl!lc':'t.ive action nece:;:H~ry to prevent rGc.~urr~nco.
Mr.
- Ant.hcny Fui::..~ no of your off ic-e w;is nutif ie-d r:.f this Qc~c,1..i:t."Tt?n~C? by telephone by Mr.
John M~Y.epeac~ on
~J~m~i:::.t.**y 30, 1974.
Very truly youts,
- .(l~Jiai,, \\~ (i{J£pi,,_ j, W~rren R.
Cobe~n, Jr., Manager Nucleilr Po~c~ Genoration J
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