ineerin overview of spent fuel pool neutron absorbing
TRANSCRIPT
Ove
rvie
w o
f Spe
nt F
uel P
ool
Neu
tron
Abs
orbi
ng M
ater
ial D
egra
datio
n
Em
ma
Won
gN
ucle
ar R
eact
or R
egul
atio
n/D
ivis
ion
of E
ngin
eerin
gg
gg
Ste
am G
ener
ator
Tub
e In
tegr
ity a
nd C
hem
ical
Eng
inee
ring
Bra
nch
Pub
licM
eetin
gon
Neu
tron
Abs
orbi
ngM
ater
ialD
egra
datio
n
1
Pub
lic M
eetin
g on
Neu
tron
Abs
orbi
ng M
ater
ial D
egra
datio
n
Oct
ober
4, 2
012
Ove
rvie
w
•S
afet
y S
igni
fican
ce•
Mat
eria
l Typ
es•
His
toric
al Is
sues
•R
ecen
t Eve
nts
•S
taff
Obs
erva
tions
•S
taff
Obs
erva
tions
•N
RC
Que
stio
ns•
NR
C A
ctio
ns•
Kno
wle
dge
Bas
e
2
g•
Sur
veilla
nce
Met
hodo
logi
es
Pic
ture
: Spe
nt F
uel P
ool
Safe
ty S
igni
fican
ce
•P
reve
nt th
e oc
curre
nce
of a
ny in
adve
rtent
cr
itica
lity
even
tsin
the
SFP
criti
calit
y ev
ents
in th
e S
FP•
Neu
tron
abso
rbin
g m
ater
ials
hav
e a
dire
ct
impa
cton
safe
tyim
pact
on
safe
ty
–U
nide
ntifi
ed a
nd u
nmiti
gate
d de
grad
atio
n po
ses
acr
itica
lity
and
safe
tyco
ncer
na
criti
calit
y an
d sa
fety
con
cern
–C
halle
nges
com
plia
nce
with
NR
C s
ubcr
itica
lity
requ
irem
ents
: 10
CFR
50.
68 a
nd G
DC
62
•N
RC
sta
ff ha
s id
entif
ied
this
issu
e as
po
tent
ially
saf
ety
sign
ifica
nt
3
Mat
eria
l Typ
es
•M
ost p
opul
ar a
t US
pla
nts
Al
iB
Cbi
dC
t–
Alu
min
um B
oron
Car
bide
Cer
met
•B
OR
AL®
–N
on-m
etal
Mat
rixC
ompo
site
s–
Non
-met
al M
atrix
Com
posi
tes
•B
oraf
lex
•C
arbo
rund
um–
Met
al M
atrix
Com
posi
tes
•M
ETA
MIC
®
•N
ew M
etal
Mat
rix C
ompo
site
s–
Bor
tec®
4
–A
lcan
Com
posi
teP
ictu
res:
BO
RA
L® c
ross
-sec
tion
and
Bor
tec®
mic
rogr
aph
EP
RI R
epor
t TR
1013
721
His
toric
al Is
sues
•B
oraf
lex
(197
0s-1
980s
)–
Sili
ca p
olym
er m
atrix
deg
rada
tion
–IN
s: 8
7-43
, 93-
70, 9
5-38
–
GL
96-0
4: M
aint
ain
5% m
argi
n
•B
OR
AL®
(198
0’s)
–B
liste
ring
& b
ulgi
ngg
gg
–IN
83-
29
5P
ictu
res:
In-s
ervi
ce s
hrin
kage
and
Bor
afle
x re
mov
ed fr
om S
pent
Fue
l Rac
ks a
nd B
oral
Blis
terin
gE
PR
I Rep
ort T
R10
1372
1
Rec
ent E
vent
s•
Car
boru
ndum
, Pal
isad
es 2
008
–S
tuck
fuel
asse
mbl
ies
Stu
ck fu
el a
ssem
blie
s–
BA
DG
ER
test
ing
foun
d up
to
70%
degr
adat
ion
EP
RI R
epor
t TR
1013
721
to 7
0% d
egra
datio
n
•B
OR
AL®
Blis
terin
g–
Blis
terin
g•
Sea
broo
k 20
03•
Bea
verV
alle
y20
07B
eave
r Val
ley
2007
•TM
I 200
8–
Bul
ging
6
ug
g•
Sus
queh
anna
200
9P
ictu
re: C
arbo
rund
um m
icro
phot
ogra
ph a
nd e
xam
ple
of B
oral
blis
ter a
nd b
ulge
Rec
ent E
vent
s (c
on’t)
•B
oraf
lex
–Tu
rkey
Poi
ntU
nit3
2010
Turk
ey P
oint
Uni
t 3, 2
010
•A
real
den
sity
was
less
than
the
licen
sing
bas
is•
Inef
fect
ive
impl
emen
tatio
n of
cor
rect
ive
actio
nsp
•In
effe
ctiv
e in
iden
tifyi
ng a
nd m
itiga
ting
degr
adat
ion
–P
each
Bot
tom
Uni
t 2, 2
010
•P
anel
s de
grad
ed b
elow
the
TS re
quire
men
ts•
Inef
fect
ive
impl
emen
tatio
n of
cor
rect
ive
actio
ns•
Mon
itorin
g an
d m
itiga
ting
the
degr
adat
ion
not a
dequ
ate
–IN
12-
13
7
Staf
f Obs
erva
tions
–S
urve
illanc
e pr
ogra
m im
porta
nt to
det
ect
onse
tofd
egra
datio
non
set o
f deg
rada
tion
–E
ffect
iven
ess
of s
urve
illanc
e m
onito
ring
prog
ram
sim
pact
man
agem
ento
fthe
SFP
prog
ram
s im
pact
man
agem
ent o
f the
SFP
–E
ffect
ive
oper
atin
g ex
perie
nce
eval
uatio
n ca
n l
dt
lid
tifi
tile
ad to
ear
ly id
entif
icat
ion
–U
nkno
wn
degr
adat
ion
mec
hani
sms
and
rate
s co
uld
resu
lt in
redu
ced
subc
ritic
ality
mar
gins
.
8
NR
C Q
uest
ions
•M
ater
ials
in e
ach
SFP
and
mon
itorin
g m
etho
d•
Mon
itorin
g an
d m
itiga
ting
the
mat
eria
l de
grad
atio
n•
Deg
ree
of a
ccur
acy
of in
-situ
neu
tron
atte
nuat
ion
mea
sure
men
ts•
Sur
veilla
nce
inte
rval
s to
mon
itor d
egra
datio
n•
Mat
eria
ldeg
rada
tion
affe
cton
the
criti
calit
y•
Mat
eria
l deg
rada
tion
affe
ct o
n th
e cr
itica
lity
anal
ysis
9
NR
C A
ctio
ns•
IN 0
9-26
, LR
-ISG
200
9-01
, upd
ate
to G
ALL
(N
UR
EG
1801
Rev
2)an
dIN
12-1
3(N
UR
EG
180
1 R
ev 2
), an
d IN
12-
13•
NR
C e
valu
atin
g m
ater
ial d
egra
datio
n m
echa
nism
ssu
rvei
llanc
ete
chni
ques
and
mec
hani
sms,
sur
veilla
nce
tech
niqu
es, a
nd
pred
ictiv
e m
odel
ing
Lit
tk
ld
b–
Lite
ratu
re k
now
ledg
e ba
se–
Con
firm
ator
y re
sear
ch o
n th
e su
rvei
llanc
e th
dl
met
hodo
logy
–C
onfir
mat
ory
rese
arch
on
the
surv
eilla
nce
inte
rval
ad
equa
cy
10
adeq
uacy
Kno
wle
dge
Bas
e•
Cur
rent
NR
C s
tate
of k
now
ledg
eC
omm
erci
alan
dde
com
mis
sion
edS
FPs
–C
omm
erci
al a
nd d
ecom
mis
sion
ed S
FPs
–Li
sts
mat
eria
ls in
eac
h S
FPP
idi
lld
td
–P
erio
dica
lly u
pdat
ed•
Issu
ed p
ublic
–Te
chni
cal L
ette
r Rep
ort:
ML1
1355
0241
–S
prea
dshe
et: M
L121
0905
00
11
Surv
eilla
nce
Met
hodo
logi
es•
Bor
afle
x m
etho
dolo
gies
(pre
dict
ive
code
and
in-
situ
met
hod)
exam
ined
situ
met
hod)
exa
min
ed•
Rep
orts
pub
lishe
dTL
RB
flR
AC
KLI
FEd
BA
DG
ER
–TL
R o
n B
oraf
lex,
RA
CK
LIFE
, and
BA
DG
ER
m
etho
dolo
gies
: ML1
2216
A30
7TL
RB
AD
GE
Rt
lM
L122
54A
064
–TL
R o
n B
AD
GE
R to
ol: M
L122
54A
064
•B
AD
GE
R re
port
perta
ins
to a
ll ne
utro
n b
bii
lab
sorb
ing
mat
eria
ls
12