ML20236U353
| ML20236U353 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 11/25/1987 |
| From: | BALTIMORE GAS & ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20236U347 | List: |
| References | |
| NUDOCS 8712020448 | |
| Download: ML20236U353 (6) | |
Text
--
~~
SURVEILLANCE REQUIREMENTS (Continued) 2.
Tubes in those areas where experience has indicated
~
potential problems.
The second and third inservice inspections may be.le'ss than a c.
full tube inspection by' concentrating (selecting at least 50%
of the tubes to be inspected) the inspection on those areas of the tube sheet array and.on those portions of the tubes.where tubes with imperfections were previously found..
The results of each sample' inspection shall be classified into one of the following three categories:
4 Cateoory Inspection Results C-1 Less than 5% of the total. tubes inspected are degraded tubes and none of the in-spected tubes are defective.
C-2 One or more tubes, but not more than 1% of the total tubes inspected are defective' or between' 5% and 10% of the total tubes inspected are degraded tubes.
C-3 More than 10% of the total tubes inspected l
are degraded tubes or more than l% of the inspected tubes are defective.
Note:
In all inspections, previously degraded tubes must exhibit significant (>10%) further wall penetrations to be included in the above percentage calculations.
4.4.5.3 Inspection Frequencies - The above required inservice inspections j
of steam generator tuoes snall be performed at the following frequencies:
j a.
JRee-first ' ::rv':: ' :;;; tic: 05:1' 5: ';:rf:. ;: :ft:r S Eff::tive Fel' ^:r:r " th: but with'- 25 ::!: d:r ;;;th: Of I
initi:1 :ritic:l'ty.
5;t::q;;nt Inservice inspections shall be%%" ""
performed at 'nt:rv:1 Of :t 1::: th: 12 ::r r : t': Of
-eel;;d:r ;;;th: :ft;r th: pr;;i;;; in:;;;ti:n.
If ta; een;e;;-
iwnesvau
-tiv; in:p;;t'::: fell;;ing :;rvie: cad:r "!T :: diti ::, ::t includ'ag th: pre::rvi:: ' :p;;ti:n, r;;;1t in all in;peetien re:;1t: f:lling' int: th: 0 1 ::t;g;ry er if tw; ;;;;;;;tiv; in:p;;ti:n: d;;;;;tr:t: th:t pr;;ic;;1y ;t:;r;;d d;; red;ti;;
h:: :t :::tinued : d : dditi ::1 d;;r:d:ti:n h;; ;;;;..ed, the 43:ae tiec 49tery:1 may he : t: ded t: : ::: ire Of ::::
___,a _ _ _. u..
y-4 i
CALVERT CLIFFS - UNIT 1 3/4 4-7 1
q B712O2044B B71125 DR ADOCK 0500 7
AMENbmEAfr NO.
j l
a -
.i
4 l
REACTOR COOLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) t.
If the e::rvi:: * :p::ti:n Of : :t::: ;:::r:t:r :: de:t:d in d
1
- rd:::: rith T:51: f.! 2 r:;;ir:: : third :: ??: in:;::ti:n-
'h::e results fal' 4-Cate;0ry C -3, th: d:c;::ti
'r:;::::y 1
l ch:11 he r:f20:d t et least :::: ::r 20 :::th:. Th: 7:de:ti:n
- :p : tie 'r:;erney :h:11 apply :ti' : Sch::; tent inspecties l.
i d ;;;:tr:t:: that : th'rd : pl: ' :p:-tic i: ::t 7;;;ir:d.
q l
Additional, unscheduled inservice inspections shall be performed j
Jr.b on each steam generator in accordance with the first sample inspection specified in Table 4.4-2 during the shutdown subsequent to any of the following conditions:
1.
Primary-to-secondary tube leaks (not including leaks
.I originating from tube-to-tube sheet welds) in excess of the limits of Specification 3.4.6.2, 2.
A seismic occurrence greater than the Operating Basis Earthquake, 3.
A loss-of-coolant accident requiring actuttion of the engineered safeguards, or 4.
A main steam line or feedwater if ne break.
4.4.5.4 Acceptance Criteria a.
As used in this Specification:
j 1,
Imperfection means an exception to the dimensions, finish or contour of a tube.from that required by fabrication j
drawings or specifications. Eddy-current testing indications below 20% of the nominal tube wall thickness,_ if detectable, may be considered as imperfections.
u 2.
Degradation means a service-induced cracking, wastage, wear or general corrosion occurring on either inside or outside of a tube.
3.
Decesced Tube means a tube containing imperfections >20%
of tne nominal wall thickness caused by degradation.,
4.
t Degradation means the percentage of the tube wall tnickness affected or removed by degradat1on.
CALVERT CLIFFS - UNIT 1 3/4 4-8 Amendment No. ))(;(
- i
I REACTOR COOLANT SYSTEM SURVEILLANCE REQUIREMENTS (Continued) i 5.
Defect means an imperfection of such severity that it exceeds the plugging limit. A tube containing a defect is defective.
Any tube which does not permit the passage of the eddy-current inspection probe shall be deemed a defective tube.
6.
Plugging Limit means the imperfection depth at or beyond which tne tube shall be removed from service because it may become unserviceable prior to the next inspection and is equal to 40% of the nominal tube wall thickness.
7.
Unserviceable describes the condition of a tube if it leaks or contains a defect large enough to affect its structural integrity in the event of an Operating Basis Earthquake, a loss-of-coolant accident, or a steam line or feedwater line break as specified in 4.4.5.3.pf, above.
l b
8.
Tube Inspection means an inspection of the steam generator tube from the point of entry (hot leg side) completely around l
the U-bend to the top support of the cold leg.
i b.
The steam generator shall be determined OPERABLE after completing i
the corresponding actions (plug all tubes exceeding the plugging limit and all tubes containing through-wall cracks) required by i
Table 4.4-2.
4.4.5.5 Reports l
1 a.
Following each inservice inspection of steam generator tubes, the number of tubes plugged in each steam generator shall be reported to the Commission within 15 days pursuant to Specification 6.9.2.
i i
b.
The complete results of the steam generator tube inservice inspec-l tion shall be included in the Annual Operating Report for the period i
in which this inspection was completed (pursuant to Specification 6.9.1.5.b).
This report shall include:
l 1.
Number and extent of tubes inspected.
2.
Location and percent of wall-thickness penetration for each indication of an imperfection.
3.
Identification of tubes plugged.
i CALVERT CLIFFS - UNIT 1 3/4 4-9 Amendment No. ///
l l
w_____
2 SURVEILLANCE REQUIREMENTS (Continued) l 2
Tubes in those areas where experience has indicated-potential problems.
y c.
The second and third inservice inspections may be less than a full tube' inspection by concentrating (selecting at least 50%-
of the tubes to be inspected) the inspection on those areas of-the tube sheet array and on those portions of the tubes where l
tubes with imperfections were previously found.
)
The results of each sample inspection shall'be classified into one of the.
'I following three categories:
Category Inspection Results i
C-1 Less than 5% of the total tubes inspected are degraded tubes and none of the in-spected tubes'are defective.
C-2 One or more tubes, but not more than 1% of the total tubes inspected are defective,. or between 5% and 10% of the total tubes inspected are degraded tubes.
C-3 More than 10% of the total tubes inspected are degraded tubes or. more than 1% of, the.
inspected tubes are defective. -
1 Note:
In all inspections, previously degraded tubes must -
exhibit significant (>10%) further wall penetrations to be included in the above percentage calculations.
4.4.5.3 Inspection Frequencies - The above required inservice. inspections of. steam generator tubes snall be performed at the following frequencies:
1 i
The,.'.fr.:.t 4 : rvie: e:p:: tis. :h:11,_bc,;;rf:r;;d :ft:r '_ _,
d a.
.e..,,.............&.....m......a.. u....,..,-.........&.
n_..__
u.
a__
e,.........
initici crit'::lity. S;t::q;;;t inservi e inspections shall be
____'_U $ Z " S e" m d
'2 per., formed at int;rvel: Of'act 1::: th: 1.: ;;r ;;r: t':
l
...-... - -.-.,....u..--,..4.....
4....
4.
__2..
___.u,
,,m_
i tive in;p;;ti;a; f:110'.ing ::rvi:: ;;d:r AVT ;;r.diti;;;, n;t q
- :! die; the pr::ervie:
- pectice, r:: ult in :11 ir.;;;;ti;n i
r; ;it; f lling int: th: 0 '. ::t ;;ra r if 0; ;.;;;;;ti;;
in;p:;t.' :: d;;;;;tr:t: th:t pr:vi:::ly ;t;;rv;d d;;c;d;ti;;
5:: ::t ::: tine:d : d : :dditi ::1 d:gr:d:ti:n b:: ;;;;.. ;d, th: in:;;; tic int:rv:1 ::y b; ::t;;d:d :: : :::ir: ;f ;;;;
p;r 'O ;;;;h;.
,CALVERT CLIFFS-UNIT 2 3/4 4-7 1
1 1
4 1
l Ammbmear, wo 1
b
C
~
REACTOR COOLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)
~. -
-b.
If th: in::r;i:: in:p::tien Of : :t::: ;:ncr:ter ;;;f2:::d in
- rdance with T:ble '.'-2 r;;;ir;: : third. : ;1 in:;;;ti:n ah;;; r;;;1t: f:11 in C:t;;;ry C-3, th: in:;;; tion fr;;;;;;y th:1' be refered t: :t le::t :n:: per 20 :: nth:. The.;d::ti:n in in:p:rti:n fr:;;:n:y :h:11 :p:1y-unt44 : :cb:;;;;nt in;;;;ti:n-d;;;n:tr:t:: th:t : th'rd 51 ;1: in:;;;ti:n i: n:t r;;;ir;d.
-G b. Additional, unscheduled inservice inspections shall be performed on each steam generator. in= accordance with the first: sample-inspection specified in Table 4.4-2 during the shutdown subsequent to any of the following conditions:
1.
Primary-to-secondary tube leaks (not including leaks l
l originating from tube-to-tube sheet welds) in excess of the limits of Specification 3.4.6.2, 2.
A seismic occurrence greater than the Operating Basis.
Earthquake, 3.
A loss-of-coolant accident requiring actuation of the engineered safeguards, or 4.
A main steam line or feedwater line break.
4.4.5.4 Acceptance Criteria a.
As used in this Specification:
1.
Imperfection means an exception to the dimensions, finish or contour of a tube from that required by-fabrication drawings or specifications.
Eddy-current testing indications below 20% of the nominal tube wall thickness, if detectable, may be considered as imperfections.
2.
Degradation means a service-induced cracking, westage,-
wear or general corrosion occurring on either inside or outside of a tube.
3.
Degraded Tube means a tube containing imperfections >20%
of the nominal wall thickness caused by degradation.-
a.
% Degradation means the percentage of the tube wall-thicxness affected or renoved by degradation.
AmendmentNo.jgh/
CALVERT CLIFFS-UNIT 2 3/4 4-8 L
~
~
~
-]
i REACTOR' COOLANT SYSTEM SURVEILLANCE REQUIREMENTS (Continued) 5.
Defect means an imperfection of such severity that it exceeds
[
the plugging limit. A tube containing a defect _is defective.
Any tube which does not permit the' passage of the eddy-current inspection probe shall be. deemed a defective tube.
6.
Plugging Limit means the imperfection depth at or beyond which-the tube shall be removed from service because it may become.
unserviceable prior to the next inspection and'is equal to 40% of the nominal tube wall thickness.
7.
Unserviceable describes the condition of a tube if it leaks or:
contains a defect large enough to affect its structural integrity in the event of an Operating Basis Earthquake, a loss-of-coolant accident, or a steam'line or feedwater line breakasspecifiedin4.4.5.3.f.above.
l b
8.
Tube Inspection means an inspection'of the steam generator tube from the point of entry (hot leg side) completely. around the U-bend to the top support of the cold leg.
b.
The steam generator shall be determined OPERABLE after completing the corresponding actions (plug all tubes exceeding the plugging limit and all tubes containing through-wall cracks) required by Table 4.4-2.
4.4.5.5 Reoorts Following each inservice inspection of steam generator tubes, the a.
number of tubes plugged in each steam generator shall be reported to the Commission within 15 days pursuant to Specification 6.9.2.
b.
The complete results of the steam generator tube inservice inspec-tion shall be included in the Annual Operating Report for the period in which this inspection was completed (pursuant to Specification 6.9.1.5.b).
This report shall include.:
1.
Number and extent of tubes inspected.
2.
Location and percent of wall-thickness penetration for each indication of an imperfection.
3.
Identification of tubes plugged.
CALVERT CL1FFS - UNIT 2 3/4 4-9 Am % dment No.
[
i J