ML19350B661
| ML19350B661 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 02/23/1981 |
| From: | Trimble D ARKANSAS POWER & LIGHT CO. |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| GR-0281-06, GR-281-6, NUDOCS 8103230214 | |
| Download: ML19350B661 (4) | |
Text
_-________.
f
/(,
r.-
AAKANSAS POWER & LIGHT COMPANY POST CRCE BCX 551 URLE ROCK. ARKu.sAS 72203 (50')371-4000 February 25, 1981 4
GR-02SI-06 hL, d
Nr. K. V. Seyfrit, Director gj "'4",,,",, l,') 7gOI A I~
Office of Inspection S Enforcement 4
2 U. S. Nuclear Regulatory Co==.
Region IV
%$D'oe 4
r 611 Ryan Plaza Drive, Suite 1000 O
P Arlington, Texas 76011 9
hll1>
SUBJECT:
Arkansas Nuclear One - Units 1 S 2 Docket Nos. 50-515 and 50-365 License Nos. DPR-51 and NPF-6 Energency Exercise Scenario (File: 1510.4, 2-1510.4 Gentlemen:
Arkrnsas Pow and Light Company is presently planning to participate in an emergen f preparedness exercise with state and local authorities on March 24 and 25, 1981. Attached for your review is the narrative su=ary of the scenario to be used for the exercise. We request tr.at you send any ccaments to us as socn as possible.
We would also like to know the expected extent of involvement the NRC plans to have in this exercise.
3 Very truly yours, j
O :
/
'. G U,'
n_ ;.
A -David C. Trimble Manager, Licensing DCT:1p Attachment cc: Director of Nuclear Reactor Re;ulation ATTN: Mr. Brian R. Grimes, Asst. Director 2.ngineering and Proj ects U. 5. Nuclear Regulatory Commission
(
Washington, D.C.
20555 s103230 M P
,_ m=m s_ umres e s -
2 NARRATIVE Sl?2ARY OF THE SCENAU O The exercise begins en March 24, 1931 wi th a repcr ey the System Dispatcher that it is imperative for all units en lir.e to remain on line if at all possible.
combinaticn of scr.eduled and force cutages of other unit: (Wnite Bluff, ASCJ) as well as a limited a= cunt of pcwer available frcr other utilities has race tnis reques necessary in order to teet the current high demar.d for ac er.
It is probable that any forced cutage is likely c result in blackouts.
L..:. !. L.c. ^ r. " = r ".'.
2.' + *., *.*. c.
- . c-i i c. "
- .' s.l
". 4. *. r -. ",i. *. 9
- 4. r. - #.
.2
- e >-
2.
m.
u j..., c. o s s. i n w~ ~ n *..<
c.r
~,4. o " 'v..
0 2 - i ^.- c..i s *. r. j" * :. c..
2 o
r.j"
- ^ ' l a. '.
..a
~
v s
e s.. ~ '6 o era ro n c. e - s-
- F..: *
- e.o. ~.
o'4.-21
.C "c -i # 4. C 2
- 4 ^..
'"~i*#.".".
4 -
4...s.
ss s
c-i -
ivs v..
~
u w
4 5
pf u 1 (y
- r. n s } u a *.
- 5. $ oX r ga. d o. k z 's., - e. *.1. y { pa e u f *.c ".
.r p ". v.
l-
\\
.s.]i:si.
3e e
n*
ss na irwrcaso
.. -. i ri r o= u. v.=. c. a v i. ".y
's. v s l e.,
i-
-i c4 3 r v *s. v ra
- F.. a. :=.r.-.'s..' s;.-= or 4.
a v
aiant areas.
The shif: coeraticns sucerviscr csclares a nctificaricr. of n r.. u s 2. ] o y e n *s.
O c = o..c a.
- e2 i. C ". 4. r. =. 2 c *s. v i *]'
s c' O.~ a~
- D.^^. s *. 2
- l c.
i s
e
.a
.a s. ". c' ". s o.o '.
- sr.a..". c. a
- . c r e ^.s. r.
- 4. e. d s. *. c.r.~i r. s. "
. r. *. i n ' S.
v.- c. e.2
- i r -
c s-c
.. m v
v
.s fCr 43 hours4.976852e-4 days <br />0.0119 hours <br />7.109788e-5 weeks <br />1.63615e-5 months <br /> as allCs.'ed b) the IECrCiCal $cecifica:icrs. ".cni:Oring cf O#irary CC0lan: is increastC tc eV ry fCJr hcurs.
- i i s v. (< 1 C 9. ". 2 r.", ^c'.*.,
- .*.o.
- . : # '2n. -
- . " c. l. "..~"".'.*.r'
- i. r..- i. r. s
- s t
- *
- s. e c.
.v S *. =. a inre.a..n5a. i a-4
. s n]ze. g. ~s..4.;.+wy.,
++a.
(.z. :.. v - -.. s ~. rju ce rs~=ey e.cO~,ss v
a su w
y rescrts that the most recent prirary Coolant sa~cle nas an icdine activity of 40 n:i/g.
A cecision is cade to rec;ce :cwer to ET; in Orcer C rem?in hell within !Pe acceOtable c0eratir.; linits OrCvicec in
-. o v..ni C S I
.C. o r. i. #. 4. e * *.i C r. s 2 ". "
w... i r.'. 3 c y A r * *. ',.
- . *.i. 'A
.o.
- #, - s. l i. a *.
4
.s.
w m
4-,-e.s m.
c
. ne. c e.n
.,g e. cs.
o - s. re sj A: EAM CST cn "arcn 25, a significan: step change in :rimary coolant iccine activity to 110 gci/g, is reported by raciccr.e-istry.
Thi s value is within the limits of the Technicai Sreci#ica:icns cut an Altet Erer :e'cy Actico level is ceclared ny the Shif t Creraticn Su ervisor as re:uired by tre -rergency rian.
,ncreases in racicac:1.ity in tr.e vicinity i
cf :ne Reactor Ccolant Cleanup Syste are repcriec, :.t r.c of fsite releases are re:crted.
Due to ne severe neec for czer, a cecision is c n. e t. is r. ". a.b e cn.'. '. m
- c...'.-
" rs *. *. 'n~ : ". s"~=.r a ^^
1 0 0. '.
s v.~ s..
- 4. *. i s..<
- c. ". *. = "
-2s.s.
a
.u s.
u In a! n...n.s1 Wiii line.
- s. 7 9. tO N. L3: ea 4~3rso 4.,
3
.3 r. 4. c 's 10.:s 99
.v : #a 'i e
.t r,.. h..
r v rs r-e.s.-.1 n
-c
. - a.
. e.
a u.
ss.
va
.m grid leads to a reactor pcter-turair.e pcwer r.iscatch.
Tne Steam Dura and By? ass Systen f ails to Cperate, reaCter pressure ir.Crers' leaCing to reac cr trip, and the main steam safety valves open te relieve steam generator pressure.
In this process a safety valve en steam genera:cr A fails catastrophicall; and at leas: two tubes in stear generatcr A rupture.
The result of the above transient is high reactor coolant activity leaking from the primary side to the secondary side througn ructured steam generator tubes and a release to the environment thiough the broken safet; valve.
The Shif t Operations Supervisor declares a General Emergency Action Level as required by the Emergency Plan.
Vs 4
f;arrative Summ ry February 6,1981 r
A ; operation member dispatched to inspect the broken safety valve is s;alded, radiclogically contaminated and knocked unccnscicus by escaping s team. The emergency medical team is activated and the individual is
';ransported to St. Mary's Hospital for treatment.
Members of the Emergency Radiation Team dispatched to monitor the site environment report a whole body dose rate of 250 mr/hr at the site boandary in the dcwnwind direction.
Other areas report readings of a: proximately 1 cr/hr includ'.g within the administration building.
Fcrtions of the auxillary building are contaminated by es:apir.g stear.
An evacuation cf the exclusion area is ordered ar.d plant perscnnel are kept within olant buildings to minimize their ex;osure.
By approximately 3:30 FM the reactor coolant system ano the steam generato: ;
are sufficiently depressurized to allow repairs on tre broken safety valve to take place.
Repairs are completed by 4PM and all offsite raciol0gical releases are terminated at that time. By 4:30 PM, radiation le',els at the exclusion area boundary are less than Imr/hr.
By 5:C3 PM radiation levels t;ithin the 10 mile Emergency Planning Zone are reported to be less tnan Imr/hr by state officials and the exercise is terminated.
l l
y v
w, o
m -
Narrative Summary February 6,1981 An operation member dispatched to inspect the broken safety valve is scalded, radiologically contaminated and knocked unconscious by escaping steam.
The emergency medical team is activated and the individual is transported to St. Mary's Hospital for treatment.
Members of the Emergene.y Radiation Team dispatched to monitor the site environmant report a whole body dose rate of 250 mr/hr at the site boundary in the downwind direction.
Other areas report readings of aoproximately 1 mr/hr including within the administration building.
Portions of the auxillary building are contaminated by escaping steam.
An evacuation of the exclusion area is ordered and plant oersonnel are kept within plant buildings to minimize their exposure.
By approximately 3:30 PM the reactor coolant systeT and tne steam generators are sufficiently depressurized to allow repairs on the broken safety valve to take place.
Repairs are completed by 4PM and all offsite radiological releases are terminated at that time.
By 4:30 PM, raciation levels at the exclusion area boundary are less than Imr/hr.
By 5:C0 PM radiation levels within the 10 mile Emergency Planning Zone are repcrted to be less than Imr/hr by state officials and the exercise is terminated.
I I
r l
l
~
r C.