ML20077G195
| ML20077G195 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/21/1983 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20077G179 | List: |
| References | |
| NUDOCS 8308030407 | |
| Download: ML20077G195 (6) | |
Text
e ENCLOSURE 1 PROPOSED TECHNICAL SPECIFICATION REVISIONS BROWNS FERRY NUCLEAR PLANT UNITS 1, 2, AND 3 (TVA BFNP TS 178 SUPPLEMENT 1)
^
8308030407 830721 PDR ADOCK 05000259 P
PDR I
UNIT 1 a
Figure 3 6-1 1200 -
Curve #1 Minimum temperature 5-9-83 for pressure tects such as required by Section XI.
Minimum 1000 -
temperature of 1860F is required for test
~~.
pressure of 1,100 psig.
~
Curve #2
.l
.I Minimum temperature for:
800 -
- ~
mechanical heatup or
- -f.
nuclear shutdown.
cooldown following 3
j
_:T'
~~ ~
Curve #3 Minimum temperature for l
3
~
core operation 600 -
/
y T~~.1 (criticality) includes additional margin aG required by 10CFR50,
- 0; Appendix G, j$
~~
Par. IV A.2.C.
u h
400 -
Notes
.y
~~'
y These curves include S
sufficient margin to provide protection
.u l
against feedwater nozzl@
degradation. The curves 200'-
also include a 36oF Z
shift in RTNDT of the reactor vessel beltline
'-~
. :'l
~
^ ' ~ ~
.T-UP TEMPERAT1:RE material. This shift
. [B01 to be used up to 6.0 EFPY
~
will allow these curves 0-0 100 200 300 400 MINIMUM TEMPERATURE
( F) 194
,,,_,,h a--.~
UNIT 2 Figure 3 6-1 1200 -
Curve #1
.'ll. ~ 1..
Minimum temperature
,5-9-83
~
for pressure tests
^
such as required by Section XI.
Minimum j
temperature of 1860F 1000 -
is required for test press..e of 1,100 psig.
- c..
Curve #2 l-,
.I Minimum temperature for 800 -
mechanical heatup or
.f nuclear shutdown.
cooldown following g
f d
~
Curve #3
[
T.'~~.~.'
Minimum temperature for p~
core operation 600 -
/
(criticality) includes additional margin y
xg required by 10CFR50,
~g Appendix G, j$
~
Par. IV A.2.C.
a 400 -
Notes y
~
These curves include 1
g sufficient margin to
-S provide protection l
P against feedwater nozzle
!h degradation. The curves
'00 ~
also include a 36cF -
4 chift in RTNDT of the reactor vessel beltline
.T--UP TEMPEPE1:RE material. This shift I~
t
[B01 will allow these curves to be used up to 6.0 EFPY.
0-0 100 200 300 400 MINIMUM TEMPERATURE
( F) 194
.. JM.
F a
e UNIT 3 Figure 3.6-1 1
2 3
1200 -
I Curve #1 Minimum temperature
' 5-9-83 fer pressure tests
~
such as required by Section XI.
Minimum temperature of 186oF 1000 -
f is required for test pressure of 1,100 psig.
~~
Curve #2 j
Minimum temperature for 800 -
~
J e hanical heatup or
.f~
nuclear shutdown.
cooldown following
~
g
. ~ '
Curve #3 Minimum temperature for e operation 600 -
/
(criticality) includes additional margin
- j
[p required by 10CFR50, 0;
Appendix G,
>4
- j R; Par. IV A.2.C.
- a A
400 -
Notes (j-
- ,j These curves include x
sufficient margin to S
provide protection
'.3 against feedwater nozzle
.i d!
degradation. The curves 900'-
also include a 36oF
~
shif t in RT DT of the N
reactor vessel beltline
~
LT-UP TEMPERAT1:RE material. This shift
,g
BO will allow these curves t be used up to 6.0 EFPY.
0-0 100 200 300 400 MINIMLDI TEMPERATURE
( F) 707
ENCLOSURE 2 DESCRIPTION AND JUSTlFICATION (TVA BFNP TS 178 SUPPLEMENT 1)
Page 194 - Units 1 and 2 Page 207 - Unit 3 Description This is a proposed change to figure 3.6-1 for all three units. This figure shows curves of minimum temperatures as a function of reactor pressure for pressure tests such as ASME Section XI, for mechanical heatup or cooldown following nuclear shutdown and for core operation (criticality). The existing figure 3.6-1 is applicable only through 4.0 Effective Full Power Years (EFPY). This proposed change extends applicability through 6.0 EFPY.
Reasons /Justificaticn This existing figures (through 4.0 EFPY) are nonconservative for application beyond 4.0 EFPY. These proposed revisions are submitted to maintain the margin of safety provided by the earlier version of Figure 3.6-1.
This revision is needed to accommodate the shift in RTNDT necessitated by increasing neutron fluence on the pressure vessel walls as the pressure vessel ages. The revision shifts RTNDT 360F which is a 60F increase over the previous revision to figure 3.6-1.
This revision is necessary to maintain the same degree of overall plant safety.
Safety Analysis All changes cre in the conservative direction, i.e., shifted toward higher temperatures at lower pressures. This is a safer mode of operation than is currently allowed, thus there is no safety concern associated with making this change. Plant operation of units 1, 2, and 3 is presently restricted administratively to the conservative curves of enclosure 1.
r t.
.e ENCLOSURE 3 Significant Hazards Consideration (TVA BFNP TS 178 SUPPLEMENT 1) 1.
Does the proposed amendment involve a significant increase in the probability or consequences of an accident previously evaluated?
0 The revision reflects a 6 F temperature change in the No.
conservative direction and provides a margin of safety which complies with the fracture toughness requirements in 10 CFR 50, appendix G; therefore, this revision does not involve a significant increase in the probability or consequence of an accident previously evaluated.
2.
Does the proposed amendment create the possibility of a new or different kind of accident from any accident previously evaluated?
A 6 F increase in pressure-temperature operating requirements 0
No.
is an increase in the conserv tive direction and will not create the possibility of a new or different kind of accident from any previously evaluated.
3 Does the propoced amendment involve a reduction in a margin of safety?
No.
The revision does not involve a reduction in the margin of safety. As stated in (1), the revisiots reflects a 60F temperature change in the conservative direction and provides a margin of safety which complies with the fracture toughness requirements in 10 CFR 50, appendix G.
_..