ML20246N307
| ML20246N307 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 05/11/1989 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20246N303 | List: |
| References | |
| NUDOCS 8905190402 | |
| Download: ML20246N307 (6) | |
Text
_ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _-
ATTAGEENT 1
?JSPOSED CHANGES TO APPENDIX A IECMICAL_SEIC1fl.CATIDH SEC. TION 3 15 AUXI HAEX_ ELECTRIC POWER SUPPLY PAGE( S)_MQplf_1ED 255a 255b EAGIIS) ADDED NONE PAGE(S) DELETED NONE I
l
/sc1:0114T 3 i
l 8905190402 890511 ADOCK 05000295 PDR PDC P
y 0"
d
. d b
e yi 2
e s 2
n n a af 1
n h t l d i o
t n B.
i t o e cl n e
s t s r e ei e y m n 1
1 e e p s h gl y
r o e
t h 5 ri p s et a p b
o p od i i t p ef m i t
. 1 i
e s d w u a k r r o n
B.
4 r, c a o
c a e c U y pd n t 3 l
e p
f 1
n o o n a yl h s e
h s t i 5 i yi i h e a a c t oh l
r t a t d d h n t t i t 1
d e e s m o
s y e w a 3 e t p a et M 5
l n nf s
i a e r n 4 b e o a o e o sf i yl e o 5
v p em mY gt n i d a l
v t e5 i
a o c ed t l e
h 2 t o T
t d i e m ai t
t a c t I u et p m5 w eh e
r oL O r c s i 4 E h g g g t n n I e
L B t u n a s i B
g iuS gB eB 2 o
i p i a s A n q n2 h A n r r
nt eR i e ni t R d I b u n i r oE l
r i t d E n d o m e d P e
s n gP a e
d c O
u ed e a n O
.b e e a
t A 0 l
l f I e
f r et i
e ai
, r) 2 8 l b b oi h
f eA u1 9 l a a t
t R
)
i c2 D
(
s1 i r t e.
9 8 c n r
w e
s n s e D o p e ni n t 8 2 e a,
.E t
9, 2 oh a m o a 9
pl 8 1
, s l 1
eI a2 nt e r s r m e at A
i cF r t
i l 2 s e,i I e yi n
t e s l
(
a v A vR n r n s e o t e r n a
r1 rE e aU r m
x d o
u o s e
r m F s2 u eV g u, o c t t o e e r
s s s r
1 ot r
el b eh e n n t h d t
e o mb e el b e o
t t a inh t o s F b 0 m
c n o o a
i r U T a rl e a3 s e o
t 5
n e rf l i f r rt si r 5
U n r e
i d o et o a i t od 2
n r w p x t t h a e
e o. a o r r o e a s t m ed e gf 2 gt B o e n n r
r c e h
t l s5 a2 f d i e N n o n e l
r r
e n O i f a n e t 1
g s n e ed yO sh e I n n n e e4 s n n c e t gT d i e s m
e e a n y m C
e t t i i ed i g, e r o n l
A s r n n rd e
u e e
u r n d u o c i s e h i m A qt eh a
d oi a l
w u n e2 e ab t eh s t m e d t q, o s r m i
i t a o r
ri i y r d i B, f r B w d
E of q o
e2 e
i 2 D r o u rl 5 ed 1 ef - 5 B r e n r1 m
, n o o e t
F s e r c n r I
o I
e r
p o e w3 o 0"
A a C d
d a I
g c y, o f "
l l
A o n r R oi e a6 p, r l
n2 M a e E
l v c d
2 ef si o n
V r n r e p o r ei rd A e g e a 5 ot B.
o v Z o n 1
g m inf ie n s l
el t r t a r
l 4
i a a u e a d l e
5 s1
.b v r s h r s l
e t i o a
n e o5 l o e t e r u s m - v l
m n e n u o e e a t r rd 1
e eh n e o h i h x u u o oC F M A 4 i r gT i gh S d T e o s w
)
I I
l
s s
r r
h h
. d s
s s n 2 r 2 r l
l l
y a 1 h 1
h a
a a
a y
n n
n d s l n0 n
0 o
o o
i i 3 i
3 i
i i
7
'p a h
h n
t t
t pd t l t
l w
i i
i n
i a i a o d
d d
oW s w n w
nd N
d o
o t I
e.
d.
d
.iS
'p 3 i 3
it h O
a a
a t
u e
e aC p t
T o c o c o c r2 ei e
iS C
N n N n N n e C
d d d
d A
a a
a p& C od o
d e l
l o
M a M
at
.l l
.l
.l B B a
O i
O i O i 2 2 O 2 5 2
5 i C e C e C e d
L v L v L vt t &
t e t
e e o u o u o u n eA n o i d m r
r r i s i d u
n o s
)
N s N s N s U T O U M U
MI 989 1
e e
e e
e l
l l
l l
L b
b b
b b
L a
a a
a a
A B
9 C A r
r r
r r
p p
F 2
4 2 O e
e e
e e
o o
(
2 p
p p
p p
n n
O O
O O
O I
I E
GA T
2 U
e e
e e
e O
t l
l l
l l
I b
b b
b b
G r
A 8
B B a
a a
a a
D U
2 4
2 0 r
r r
r p
r p
2 e
e e
e o
e o
0" p
p p
p n
p n
O O
O O
I O
I F
O D
5 5
5 5
5 5
5 O
b 0
0 0
0 0
0 0
I 5
0 7
A 0
0 0
0 0
0 0
R 5
4 2
2 E
2 P
YA D
e e
e e
e l
l l
l l
5 B
9 C C b
b b
b b
4 G
a a
a a
a 1
4 I
1 r
r p
p r
r r
R e
e o
o e
e e
O p
p n
n p
p p
F O
O I
I O
O O
S T
N E
e e
e e
e M
l l
l l
l E
1 b
b b
b b
T A
8 B 0 a
a a
a a
A 1
4 1
0 r
p r
p r
r r
T t
1 e
o e
o e
e e
S i
p n
p n
p p
p n
O I
O I
O O
O N
U O
I TCA O
7 A E 5
5 S
5 5
S 5
4 1 O 0
0 0
0 0
0 0
1 0
0 0
0 0
0 0
n n
e e
'r p
G G
e P
l t
l n
e a
r p n
n e
n r
eP n
e e
s e
e se e
t e
G G
e G
G i
n al G
i D
l l
D e
W o l
l G
o l
e e
e e
eC e
s s
B s
s 8
e 2
l c
s e
e I
e i
e i
e i
i s
v p i
D iD D
D e
s r m D
u e o A
B A
A B
A iD B
S C O
1 1
1 2
2 2
l' ll l
I l
l' ATTACID4ENT 2 EYALUATION OF SIGNIFICANT HAZARDS R SIDERAIIDti ERQEQEED TECl!NICAL SPECIFICATION AMENDMENI SECTION 3.15 AUXILIARY ELECTRIC POWER SUPPLY
/se1:0114T:4 4
5
L, AIZEHMENT &
EYALUATJDtLDE__SLGNIFEAMLHAZARDS_ CONSlRERAHON PROPOSED CHAT!GES TO HQli_TEHNEAL SPECIFICATI_0N AERENDIX A - SECTION 3.15 AND 4.15-AUKILIARY ELECTRICAL POWER SYSTEM DESCRIPTION OF AMENDMENT REQUEST An amendment to the Zion Facility Operating License is proposed to allow a one-time 45. day outage for "O" diesel generator during the Unit 1 Fall 1989 refueling outage.
BACKGROUND 10 CFR 50.92 states that a proposed amendment will involve a no significant hazards, consideration if the proposed amendment does not:
1.
Involve a significant increase in the probability or consequences of an accident previously evaluated; or 2.
Create the possibility of a new or different kind of accident from-any accident previously evaluated; or 3.
Involve a significant reduction in a margin of safety.
The discussion below addresses each of these three criteria and demonstrates that.the proposed amendment involves a no significant hazards consideration.
BASIS FOR NO SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION t.
Does the proposed amendment:
1.
Involve a significant increase in the probability or consequences of an accident previously evaluated; or 2.
Create the possibility of a new or different kind of accident from any accident previously evaluated; or 3.
Involve a significant reduction in a margin of safety.
Discussion - Item 1 This proposed amendment will result in the one-time 45 day outage period for."O" diesel generator during the Zion Unit 1 Fall 1989 refue]Ing outage.
This change 1s being requested to allow for the completion of an extensive refueling outage maintenance program. This will result in increased reliability for the "O" diesel generator.
The effects of an extended outage for "O" diesel generator with one reactor operating and the other reactor in cold shutdown has been evaluated by the NRC staff. 'This evaluation was provided for in the Safety Evaluation by the NRC for Amendments 84/74 to Zion Facility Operating Licenses, March 12, 1984.
1
/sc1:0114T:5
p j,.
',i _frontinuedl The conclusion of that evaluation is given on page 4 of the attachment to the'SER of that amendment:
By comparing these onsite AC power reliability estimates, which use consistent success criteria assumptions, the proposed configuration is seen to be as reliable, perhaps more so the currently allowed configuration for the loss of offsite power sequences of concern. This is due primarily to the commitment not to perform maintenance on the other diesels while the swing diesel is out of service. The non-seal LOCA loss of offsite power sequences, are not affected by swing diesel considerations since the motor driven AFW r
pumps are powered of f the A and D diesel generators. Actually, AFW reliability in increased for the time the swing diesel is out-of-service since the A and B diesels must be operable during this period.
Based upon the above discussion, the AC power reliability of Zion Station during this 45 day period'is calculated to increase or remain stable.
Thus, this proposed amendment does not involve a significant increase in a probability or consequences of an accident previously evaluated.
Discussion - Item 2 The flexibility to allow a one-time 45 day outage on "O" diesel generator has no effect on the' reliability or integrity of any of Zion's systems.
As discussed above, the reliability of the AC power system is characterized to be "as reliable, perhaps more so than the currently allowed configuration for the loss of offsite power sequences of concern".
This 45 day one-time outage period will not have any effect on any of Zion's systems nor on the generation of any external event such as a tornado or flood. This new requirement will not create the possibility of any additional system malfunctions or externally generated events.
Therefore, this proposed amendment cannot create the possibility of a new or different kind of accident from any accident previously evaluated.
Discussion - Item 3 As discussed in items 1, the onsite AC power reliability estimate will be as reliable or perhaps more so than the currently allowed configuration for the loss of offsite power sequences of-concern.
In addition, the maintenance performed cn "O" diesel generator during this 45 day period will result in a diesel generator with increased reliability. These factor result in either an increased or constant margin of safety.
Therefore, this change does not involve a reduction in the margin of safety.
Therefore, since the application for amendment satisfies the criteria specified in 10 CFR 50.92 and is similar to examples for which no significant hazards consideration exists. Commonwealth Edison Company has made a determination that the application involves no significant hazards consideration.
2
/sc1:0114T 6
_ _ _ _ _ _ _ _ _ - _ _ _ _ _