ML19347B353

Requests NRC Position on Emergency Operations Facility Habitability Criteria Per NUREG-0696 Requiring Ventilation Sys W/Hepa & Charcoal Filters.Facility Location Reduces Possibility of Exposures in Excess of Criteria.Graphs Encl

ML19347B353
Person / Time
Site:	Rancho Seco
Issue date:	10/02/1980
From:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Reid R Office of Nuclear Reactor Regulation
References
RTR-NUREG-0696, RTR-NUREG-696 NUDOCS 8010140473
Download: ML19347B353 (3)

Text

o e

o e suun SACRAMENTO MUNICIPAL UTILITY DISTRICT C 6201 S Street. Box 15830, sacramento, California 95813; (916) 452 3211 October 2, 1980 Director of Nuclear Reactor Regulation Attention: Mr. Robert W. Reid, Chief Operating Reactors, Branch 4 U. S. Nuclear Regulatory Commission Washington, D.C.

20555 Docket No. 50-312 Rancho Seco Nuclear Generating Station, Unit 1 Emergency Planning EOF Habitability Requirements

Dear Mr. Reid:

The functional criteria for the Emergency Operations Facility (EOF) is defined in NUREG-0696.Section IV.B states that "The EOF shall be located outside the security boundary and not further than 5 to 10 miles from the reactor..." and "... it must meet habitability requirements to ensure that personnel can remain in the facility throughout the entire course of the accident, including evacuation of the surrounding area."Section IV.F goes on to state that "A permanent E0F ventilation system which includes parti-culate (HEPA) filters and charcoal filters is required as a minimum."

As indicated by NUREG-0696,Section IV.F, the EOF personnel are limited to 5 rem whole body radiation exposure (10 CFR 50 - Appendix A, Design Criteria 19). A recent study by Science Applications, Inc. (SAI), dictated by Cali-fornia Senate Bill 1183 shows less than 20% probability of exceeding 1 rem whole body exposure at a distance of 10 mile 3 for a PWR accident, categories 1-7. (enclosures)

SMUD has proposed an EOF location at 10 miles from the reactor. There is an extremely low probability that use of this EOF following the majority of Class 9 accidents will result in exposures in excess of the occupancy criteria.

It is SMUD's position, therefore, that HEPA/ charcoal filtration is not required.

We request NRC concurrence in our interpretation.

A timely response would be helpful in our continuing emergency planning efforts for Rancho Seco.

Sincerely, T

n*

OY 900hn 3. Mattimoe 3

Assistant General Manager and Chief Engineer l

enclosures 8o10 aot'7s

/-

~.

.m m - m s m

w

.a-d

'D @ @

fj ymr p -

o A

i.M3 aA a

9 Figure 9 60 00Wi WND W.0 E BODY

0SE FOR PRNCHC SECO Oo

<...........q.....,.t........-..,.

CONDITIONS:

..,............r,6............. Rancho Seco

..........i......... -...... '

v..,.. s. 3. i. c. t......,..'..i. Annual Average Weather r

u.,,

......,...,.....,l...........,....

accident Categories 1 7 l.

Fifty Year Dose Commitment r~

6

.s g6 I

I C

..........'....'...'.r--------.-----.-.

e '>

i

'M

% -.. Q.

---

.---- -.,- < - c -

s.

p i

%. 3.

1.

4 ' y,i,- Q, '

l s

i m

N

'7li N Al -

i i

u M.

I'%.L.. A e-u i

C.............,..

2.- 4.

.;...., h... (.......

s

.i.....r--i

,i -*-----*-

r--\\..,

t.................

e........,.,..

e i

i

..;......"...........'..x....q----

rT 5..-,i-'.t-...

. - i--

C

[a,,)

g

......,....7....

.'j.....i.....a...

i 6

a i

1. l

..7.'....,.

a

,. ;.,.j.

7 c

.J.i..,........,...,....,...........,.'...'.

-O

~ i.

i i

i i

e 9

i l

O 1.

... L '.

.i i

i

~

l i

t i

i i -

s..,

e, c _.

i i,

U 7.

2 y

O 25 REii g

g g p{g

.f- - - - - ** -.- y' r * - j -*-- 1-----f rji- -

s i

r x

y 1an

,.,...........,...t.....,.,...

i

..,...,.. t..

P 3

i i

e' C

i e

.=

e i

e i

a e

i e

i 4

.i i i i

i p*

i I

l

,',,,I r

H.

i a

-- c3 i.

e i

i i.

i j

t s

......'_.....'...'..,'.........'.1..2.l.......'.............

I r

i i

i i

7_i..i.....7.....,...i.7

,c, g.. 7..,.,.........,.

i i :

- - - - -, - -,- - - ' 7 1 9, 1 - - - - '- - - -,j - r.

C i-

---

r----.--

'-'r-e Curves are probability r----'-----*--,-,'--

....w'..t....d,,' ' '..,t.... '.....\\..,!.'

per accide t.

Multiply by 4.9x10- to obtain i

i probability per year.

i,

. i i

I !

l e

4

, r-r, '

. ~ '

.J 4 w

.v

. w-r,.

e. y ee.y n7 n

.n

=

.w t

e e~~

j m

+i.g

.M.

. w.

r.,.

~m

=w s

w

.w

.r-

~

9 63

D**h D M~

Ao o Ju wJ

. UJ a

(

Figure 9-56 l

00WNWIND WHOLE BODY DOSE FOR RANCHO SECO

~c O,DITIONS-d

.,.a.,.i.................,..p._..

...a_._

.......i__ _ _ _ _,_.'..i'.'____..'...r'---i Rancho Seco

......'..., a..'.'. ' 'e

a.__s.

Annual Average Weather Accident Categories 1-7

....._'___,__a.

e

.i 1

I

...t.,_..s..i l

p1'.ty Year 0ose Comitment

,m l,; I N.,

l 2-i i e -

e t

e t

i e

I i

f i ~

g t

l 'i t

i 1

i i

il.

l l

Probability, given an i

-C-accident, tnat the dose

..._'___f_*5;....._____.._7_.....

s:. -i.. _ _ _f_.. _ _ _..r....

O will not exceed the 2

p _. _ p _ ',, _. _ _ _ _ _ ; _ _...; _.. ;_. 4 specified level

.,.5.___......

~

. _ e...._.p.,...._7__s._i.._.

e u..

.......... _ e..., 9 9..g o

l a,,,

1 I

i i

i i

i f :,

... _ ______t..,_;_,.21 0.30 i

i i

i

,t

'\\.. _ _,. _ _.. i

.i C

i i

. 4..'...'_..

.....___. q. ;..

c i,.

2h 3

3 s

e i

t e

,I s

p

\\

i e

i i

i i

i

'i'i y

\\

i i

\\

..I i

i i

i i

w s

e i

i i

i gg x

e c

. r__ _ g...... _........................;... _,.... _. _,... _...

s.g..

_ _.. % w 7. s. 7.... w. i........... _. - '- - * -i - - - - -g....- A _ _ a.....

---

ag-

,---,-+_--,------------*-

ry g

_4_ _._ _.

1..___.___._..

+

i i........ _ _............

i i

i

_..___w.._,.:.%.....___a..__...2,____.....,..t_,.a,-_:..

i i.

g

- i e

i e

i i i, 7-

\\

i

.....__...i...i..

_ _.. i.._._,1...

~

i i

e i

_ i i

i

. Xi i,e

,ig l

i I

1 g,,

I i

)

i i

l

• "-8 I

I

,d,

_.....&.- _ _ _ w.5 4...t........__.I..t_1 i

...$,...1....0

_.0.1-l l

i e

i i

,i,i e

i gi,i

,i,.

e i

i i

.,i i

i i

t

'\\., ' i '

i C,_

i i

i i i

i i

i i

\\-

'l

'....._i_ _.

i i

i i

i e

i i

i i

g

...__..__,__t.,D'\\..___._..____..........____7__.....

..t_..;,___'.__..

..w__

_..t.

....L__...'

L...........'.-_'.2.2....__'....A_t_.2.'..

--.___,i.........i

, i i

i i

i r-r--**i-*

i-***

......w___..'~f.*.*--**-~~r-**r*".-*-

...........i......__...

.a........__

f

\\

1

....,..... _ e _._,i _\\,.,i..g.............e,_l_:_I,_.____......i.e t

t f

l

.____...1.....,_Le,___'__.,..'..,,'t..........._.-

',M i ii i,

+

,i.

i i

. i i

- Probabil i ty per yea r $' k - - -'-

,- 2 7 -l ;-: ;--- -- - i - ke--l,---

l I

i i 1

i of an accident is b

3,.

.9x10 3

\\ ~x,

i, i

~

x a.

~.

,0

. h,.

.'3 h

~.au. m sm e

.u. a=

, gj e a.e.

3 8'.hm

m. lp

.p.

si.

p.

ap.

p.

9

-F

-%, 0 l i

,..gu.t r

D k

p-I 6

W

..mm.

. am I 8 a.i.

W gun.. 8 tusf tumid 9-59

-