ML20086G716
| ML20086G716 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/10/1995 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20086G698 | List: |
| References | |
| NUDOCS 9507170082 | |
| Download: ML20086G716 (9) | |
Text
.
h ENCLOSURE 1 TENNESSEE VALLEY AUTHORITY y
BROWNS FERRY NUCLEAR PLANT (BFN)
UNITS 1, 2,
AND 3 i
REVISION TO TECHNICAL SPECIFICATION (TS) BASES (TS-365) i DESCRIPTION OF AND REASON FOR CHANGES I.
DESCRIPTION OF THE CHANGES Bases Section 3.7.A/4.7.A -
TVA revised this section of Units 1, 2,
and 3 Bases to clarify the method of determining
[
operability of the drywell to suppression chamber vacuum breakers.
These changes are provided below.
1.
Units 1 and 2 Bases page 3.7./4.7-29, the second paragraph revised to read as follow:
i If the check and green or check light circuit alone is inoperable, the valve shall t
be considered inoperable for full closure i
Un1sss?s11Tyschum:!breaksrsicahYbs demonstrsted 9 to f beV.fullyi close'd:[byfaltisfHsts mea'nsisuch; as :monitforing; thefdecay)istel;fof^~
drywell: toisuppressioni chamberidif ferentia1 pressure.;
[
2.
Unit 3 Bases page 3.7./4.7-28, the second paragraph revised to read as follow:
i If the check and green or check light circuit alone is inoperable, the valve shall be considered inoperable for full closure un1'sssTs119Vabuuih ' brsskefst caMbe demonstrated-to be fullyiclosed'byTalt'ernsts means,such.as monitoringithe,decayirate.j;of' drywelQtofsuppressionJchamberfdifferential pres _s_urei II.
REASON FOR THE CHANGES i
Bases Section 3.7.A/4.7.A - TVA revised Units 1, 2,
i and 3 Bases to clarify the method of determining operability of the drywell to suppression chamber vacuum breakers.
Specifically, TVA revised the Bases to allow an alternate means of verifying the vacuum breakers are fully closed.
This alternate method i
will allow drywell to suppression chamber differential pressure to be used to demonstrate the vacuum breakers are fully closed.
9507170082 950710 PDR ADOCK 05000259 P
ENCLOSURE 2 j
t TENNEeG5E VALLEY AUTHORITY i
BROWNS FERRY NUCLEAR PLANT (BFN) i UNITS 1, 2, AND 3 1
REVISION TO TECHNICAL SPECIFICATION (TS) BASES (TS-365)
MARKED PAGES I.
AFFECTED PAGE LIST Unit 1 Unit 2 Unit 3 3.7/4.7-29 3.7/4.7-29 3.7/4.7-28 II.
MARKED PAGES i
See Attached.
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r ROY 1619E 3.7/4.7 BASES (Cont'd) confirmation that the valve will at least "nearly close" (within 3' of full closure). The green light circuit confirms the valve will fully open.
If none of the lights change indication during the cycle, the air operator must be inoperable or the valve disc is stuck.
For this case, a check light on and red light off confirms the disc is in a nearly closed position even if one of' the indications is in error. Although the valve may be inoperable for full closure, it does not constitute a safety threat.
If the red light circuit alone is inocerable, the valve shall still be considered fully OPERABLE.
If the green and red or the green light circuit alone is inoperable the valve shall be considered inoperable for opening.
If the check and green or check light circuit along is inoperable, the valve shall be considered inoperable for full closurev If the red and check light 6
circuits are inoperable the valve shall be considered inoperable and open greater than 3*.
For a light circuit to be considered OPERABLE the light must go on and off in proper sequence during the opening-closing cycle.
If none of the lights change indication during the cycle, the valve shall be considered inoperable and open unless the check light stays on and the red light stays off in which case the valve shall be considered inoperable for opening.
The 12 drywell vacuum breaker valves which connect the suppression chamber and drywell are sized on the basis of the Bodega pressure suppression system Ten OPERABLE to open vacuum breaker valves (18-inch) selected on this tests.
test basis and confirmed by the green lights are adequate to limit the pressure differential between the suppression chamber and drywell during postaccident drywell cooling operations to a value which is within suppression system design values.
The containment design has been examined to determine that a leakage equivalent to one dryvell vacuum breaker opened to no more than a nominal 3*
as confirmed by the red light is acceptable.
On this basis an indefinite allowable repair time for an inoperable red light circuit on any valve or an inoperable check and green or check light circuit alone or a malfunction of the operator or dise (if nearly closed) on one valve, or an inoperable green and red or green light circuit alone on two valves is justified.
During each operating cycle, a leak rate test shall be performed to verify that significant leakage flow paths do not exist between the drywell and suppression chamber. The drywell pressure vill be increased by at least one psi with respect to the suppression chamber pressure and held constant.
The two psig setpoint will not be exceeded. The subsequent suppression chamber pressure transient (if any) will be monitored with a sensitive pressure gauge.
If the dryvell pressure cannot be increased by one psi over the suppression chamber pressure it would be because a significant leakage path exists; in this event the leakage source will be identified and eliminated before power operation is resumed.
4unbs a vate htakts can be c\\emordvdec( h bc O E-Q dead b$ abrede_ meAnS 5d % mmih%
d % m p ss e e b b r ck M M d u_a.
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c9 dv y BFN p essoJE.
3.7/4.7-29l AMDfDMENT NO. I 8 9 Unit 1
E1IE 3.7/4.7 BMIA (Cont'd) i l
confirmation that the valve will at least "nearly close" (within 3* of full Thegreenlightcircuitconfirmsthevalvewillfullyopen.(If closure).
nome of the lights change indication during the cycle, the air operator must be inoperable or the valve disc is stuck.) For this case, a check light on and
~
red light off confirms the disc is in a nearly closed position even if one of Although the valve may be inoperable for full the indications is in error.
closure, it does not constitute a safety threat.
If the red light circuit alone is inoperable, the valve shall still be If the green and red or the green light circuit considered fully 0FREARLE.
If alone is inoperable the valve shall be considered inoperable for opening.
the check and green or check light circuit alone is inoperable, the valve shall be considered inoperable for full closured If the red and check light 4---
circuits are inoperable the valve shall be considered inoperable and open For a light circuit to be considered 0FERARLE the light must greater than 3*.
If none of go on and off in proper sequence during the opening-closing cycle.
the lights change indication during the cycis, the valve shall be considered inoperable and open unless the check light stays on and the red light stays off in which case the valve shall be considered inoperable for opening.
The 12 dr7well vacuan breaker valves which connect the suppression chamber and drywell are sized on the basis of the Bodega pressure suppression system Ten OPERAgLE to open vacuan breaker valves (13-inch) selected on this tests.
test basis and confirmed by the green lights are adequate to limit the pressure differential between the suppression chamber and dryvell during postaccident dryvell cooling operations to a value which is within suppression system design values.
The containment design has been examined to determine that a leakage equivalent to one drywell vacuum breaker opened to no more than a nominal 3*
as confirmed by the red light is acceptable.
On this basis an indefinite allowable repair time for an inoperable red light circuit on any valve or an inoperable check and green or check light circuit alone or a malfunction of the operator or dise (if nearly closed) on one valve, or an inoperable green and red or green light circuit alone on two valves is justified.
During each operating cycle, a leak rate test shall be performed to verify that significant leakage flow paths do not exist between the drywell and suppression chamber. The drywell pressure vill be increased by at least one psi with respect to the-suppression chamber pressure and held constant.
The subsequent suppression The two pois setpoint will not be exceeded.
chamber pressure transient (if any) will be monitored with a sensitive If the drywell pressure cannot be increased by one pai over pressure gauge.
the suppression chamber pressure it would be because a significant leakage path exists; in this event the leakage source vill be identified and eliminated before power operation is resused.'
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au am s ca as mi% 4%. am e,=Ae 4 d y.Jl -lo w etre n u c.%%r d,KereA.A psue.
3.7/4.7-29l AMENDMENT NO. 2 04 BFN Unit 2 w...
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NOV 161997-3.7/4.7 MSJJ (Cont'd) 1 l
confirmation that the valve will at least "nearly close" (within 3* of full closure). The green light circuit confirms the valve will fully open.
If none of the lights change indication during the cycle, the air operator must be inoperable or the valve disc is stuck. For this case, a check light on and red light off confirms the disc is in a nearly closed position even if one of the indications is in error. Although the valve may be inoperable for full closure, it does not constitute a safety threat.
If the red light circuit alone is inoperable, the valve shall still be considered fully OPERABLE. If the green and red or the green light circuit alone is inoperable the valve shall be considered inoperable for opening.
If the check and green or check light circuit alon is inoperable, the valve j
shall be considered inoperable for full closur If the red and check light p circuits are inoperable the valve shall be considered inoperable and open greater than 3*.
For a light circuit to be considered OPERABLE the light must so on and off in proper sequence during the opening-closing cycle.
If none of
[
the lights change indication during the cycle, the valve shall be considered inoperable and open unless the check light stays on and the red light stays off in which case the valve shall be considered inoperable for opening.
l The 12 drywell vacuum breaker valves which connect the suppression chamber and drywell are sized on the basis of the Bodega pressure suppression system tests. Ten OPERABLE to open vacuum breaker valves (18-inch) selected on this test basis and confirmed by the green lights are adequate to limit the pressure differential between the suppression chamber and drywell during postaccident drywell cooling operations to a value which is within suppression i
system design values.
The containment design has been examined to determine that a leakage l
equivalent to one drywell vacuum breaker opened to no more than a nominal 3*
as confirmed by the red light is acceptable.
On this basis an indefinite allowable repair time for an inoperable red light circuit on any valve or an inoperable check and green or check light circuit alone or a malfunction of the operator or disc (if nearly closed) on one valve, or an inoperable green and red or green light circuit alone on two valves is justified.
During each operating cycle, a leak rate test shall be performed to verify that significant leakage flow paths do not exist between the drywell and suppression chamber. The drywell pressure will be increased by at least one psi with respect to the suppression chamber pressure and held constant.
The two pais setpoint will not be exceeded. The subsequent suppression chamber pressure transient (if any) will be monitored with a sensitive pressure gauge.
If the drywell pressure cannot be increased by one psi over the suppression chamber pressure it would be because a significant leakage path exists; in this event the leakage source will be identified and eliminated before power operation is resumed.
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3.7/4.7-28 l AMENDMENT NO. I 61 BFN Unit 3
~
UNITS 1, 2,
AND 3 REVISION TO TECHNICAL SPECIFICATION (TS) BASES (TS-365)
REVISED PAGES I.
AFFECTED PAGE LIST Unit 1 Unit 2 Unit 3 3.7/4.7-29 3.7/4.7-29 3.7/4.7-28 II.
REVISED PAGES See Attached.
m
1 3.7/4.7 BASES (Cont'd) confirmation that the valve will at least "nearly close" (within 3* of full closure).
The green light circuit confirms the valve will fully open.
If none of the lights change indication during the cycle, the air operator must be inoperable or the valve disc is stuck.
For this case, a check light on and red light off confirms the disc is in a nearly closed position even if one of the indications is in error. Although the valve may be inoperable for full closure, it does not constitute a safety threat.
i If the red light circuit alone is inoperable, the valve shall still be considered fully OPERABLE.
If the green and red or the green light circuit j
alone is inoperable the valve shall be considered inoperable for opening.
If the check and green or check light circuit alone is inoperable, the valve shall be considered inoperable for full closure unless all vacuum breakers can be demonstrated to be fully closed by alternate means such as monitoring the decay rate of dryvell to suppression chamber differential pressure.
If the i
red and check light circuits are inoperable the valve shall be considered inoperable and open greater than 3*.
For a light circuit to be considered OPERABLE the light must go on and off in proper sequence during the opening-closing cycle.
If none of the lights change indication during the cycle, the valve shall be considered inoperable and open unless the check Iight stays on and the red light stays off in which case the valve shall be wnsidered inoperable for opening.
The 12 drywell vacuum breaker valves which connect the suppression chamber and drywell are sized on the basis of the Bodega pressure suppression system tests. Ten OPERABLE to open vacuum breaker valves (18-inch) selected on this test basis and confirmed by the green lights are adequate to limit the pressure differential between the suppression chamber and drywell during postaccident drywell cooling operations to a value which is within suppression system design values.
The containment design has been examined to determine that a leakage equivalent to one drywell vacuum breaker opened to no more than a nominal 3*
as confirmed by the red light is acceptable.
On this basis an indefinite allowable repair time for an inoperable red light circuit on any valve or an inoperable check and green or check light circuit alone or a malfunction of the operator or disc (if nearly closed) on one valve, or an inoperable green and red or green light circuit alone on two valves is justified.
During each operating cycle, a leak rate test shall be performed to verify that significant leakage flow paths do not exist between the drywell and suppression chamber. The drywell pressure will be increased by at least j
one psi with respect to the suppression chamber pressure and held constant.
j The two psig setpoint will not be exceeded. The subsequent suppression chamber pressure transient (if any) will be monitored with a sensitive pressure gauge.
If the drywell pressure cannot be increased by one psi over the suppression chamber pressure it would be because a significant leakage path exists; in this event the leakage source will be identified and eliminated before power operation is resumed.
BFN 3.7/4.7-29 Unit 1
4 7
3.7/4.7 BASES (Cont'd) confirmation that the valve will at least "nearly close" (within 3* of full l
c1'osure). The green light circuit confirms the valve will fully open.
If none of the lights change indication during the cycle, the air operator must be inoperable or the valve disc is stuck. For this case, a check light on and red light off confirms the disc is in a nearly closed position even if one of the indications is in error. Although the valve may be inoperable for full l
4 closure, it does not constitute a safety threat.
If the red light circuit alone is inoperable, the valve shall still be considered fully OPERABLE.
If the green and red or the green light circuit alone is inoperable the valve shall be considered inoperable for opening.
If the check and green or check light circuit alone is inoperable, the valve shall be considered inoperable for full closure unless all vacuum breakers can be demonstrated to be fully closed by alternate means such as monitoring the decay rate of drywell to suppression chamber differential pressure.
If the red and check light circuits are inoperable the valve shall be considered inoperable and open greater than 3*.
For a light circuit to be considered OPERABLE the light must go on and off in proper sequence during the opening-closing cycle. If none of the lights change indication during the cycle, the valve shall be considered inoperable and open unless the check light stays on and the red light stays off in which case the valve shall be considered inoperable for opening.
The 12 drywell vacuum breaker valves which connect the suppression chamber and drywell are sized on the basis of the Bodega pressure suppression system 1
Ten OPERABLE to open vacuum breaker valves (18-inch) selected on this tests.
test basis and confirmed by the green lights are adequate to limit the pressure differential between the suppression chamber and drywell during j
postaccident drywell cooling operations to a value which is within suppression system design values.
j f
The containment design has been examined to determine that a leakage f
equivalent to one drywell vacuum breaker opened to no more than a nominal 3' as confirmed by the red light is acceptable.
On this basis an indefinite allowable repair time for an inoperable red light j
circuit on any valve or an inoperable check and green or check light circuit alone or a malfunction of the operator or disc (if nearly closed) on one valve, or an inoperable green and red or green light circuit alone on two valves is justified.
During each operating cycle, a leak rate test shall be performed to verify I
that significant leakage flow paths do not exist between the drywell and suppression chamber. The drywell pressure will be increased by at least one psi with respect to the suppression chamber pressure and held constant.
The two peig setpoint will not be exceeded. The subsequent suppression
]
chamber pressure transient (if any) will be monitored with a sensitiv.s i
If the drywell pressure cannot be increased by one rei over j
pressure gauge.
the suppression chamber pressure it would be because a significant leakage path exists; in this event the leakage source will be identified and eliminated before power operation is resumed.
BFN 3.7/4.7-29 Unit 2
)
3.7/4.7 BASES (Cont'd) 1 confirmati*on that the valve will at least "nearly close" (within 3' of full cloadre). The green light circuit confirms the valve will fully open.
If none of the lights change indication during the cycle, the air operator must be inoperable or the valve disc is stuck. For this case, a check light on and
)
red light off confirms the disc is in a nearly closed position even if one of I
the indications is in error. Although the valve may be inoperable for full closure, it does not constitute a safety threat.
If the red light circuit alone is inoperable, the valve shall still be considered fully OPERABLE. If the green and red or the green light circuit-alone is inoperable the valve shall be considered inoperable for opening. If the check and green or check light circuit alone is inoperable, the valve shall be considered inoperable for full closure unless all vacuum breakers can i be demonstrated to be fully closed by alternate means such as monitoring the decay rate of drywell to suppression chamber differential pressure.
If the red and check light circuits are inoperable the valve shall be considered inoperable and open greater than 3'.
For a light circuit to be considered OPERABLE the light must go on and off in proper sequence during the opening-closing cycle. If none of the lights change indication during the cycle, the valve shall be considered inoperable and open unless the check light stays on and the red light stays off in which case the valve shall be
{
considered inoperable for opening.
The 12 drywell vacuum breaker valves which connect the suppression chamber and drywell'are sized on the basis of the Bodega pressure suppression system tests. Ten OPERABLE to open vacuum breaker valves (18-inch) selected on this test basis and confirmed by the green lights are adequate to limit the pressure differential between the suppression chamber and drywell during postaccident drywell cooling operations to a value which is within suppression system design values.
The containment design has been examined to determine that a leakage equivalent to one drywell vacuum breaker opened to no more than a nominal 3' as confirmed by the red light is acceptable, On this basis an indefinite allowable repair time for an inoperable red light circuit on any valve or an inoperable check and green or check light circuit alone or a malfunction of the operator or disc (if nearly closed) on one valve, or an inoperable green and red or green light circuit alone on two l
valves is justified.
i During each operating cycle, a leak rate test shall be performed to verify l
that significant leakage flow paths do not exist between the drywell and suppression chamber. The drywell pressure will be increased by at least one pai with respect to the suppression chamber pressure and held constant.
The two psig setpoint will not be exceeded. The subsequent suppression chamber pressure transient (if any) will be monitored with a sensitive pressure gauge.
If the drywell pressure cannot be increased by one pai over l
the suppression chamber pressure it would be because a significant leakage path exists; in this event the leakage source will be identified and eliminated before power operation is resumed.
BTN 3.7/4.7-28 Unit 3 m-
.