ML20196J774
| ML20196J774 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 07/30/1997 |
| From: | ENTERGY OPERATIONS, INC. |
| To: | |
| Shared Package | |
| ML20196J766 | List: |
| References | |
| RTR-NUREG-1434 NUDOCS 9708050052 | |
| Download: ML20196J774 (3) | |
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SCIDs i,
3.6.4.2 4
SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY
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NOTES--- ------------
3.6.4.
j 1.
ers an nges in hig l
radiation areas y be verifie y
use of admini rative means.
M 1
2.
Not requ ed to be met f SCIDs that are op under adminis ative cont s.
Ve fy each seconda containment 31 da s olation manual oper and blind ange j
that is required o be closed dur ng i
accident conditions is closed./
1.6. Y. R.I
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Verify the isolation time of each power 92 days operated - ' -- ' automatic SCID is within limits.
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9,4, y,7. 3 N1 difd i
V SR 4 6.i.2.3 Verify each automatic SCID actuates to 18 months i
the isolation position on an actual or j
simulated automatic isolation signal.
9708050052 970730 PDR ADOCK 05000458 l
P PDR 1
RIVER BEND 3.6-50 Amendment No. 81
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SCIDs j
B 3.6.4 2 a
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B 3.6 CONTAllMENT SYSTEMS l
8 3.6.4.2 secondary Containment Isolation Dampers (SCIDs)
BASES BACKGROUND The function of the SCIDs, in combination with other
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accident mitigation systems, is to limit fission product i
release during and following postulated Design Basis Accidents (DBAs) (Ref. 1).
Secondary containment isolation l
l within the time limits specified for those isolation dampers designed to close automatically ensures that fission l
products that leak from primary containment following a DBA, that are released during certain operations when primary containment is not required to be OPERA 8LE, or that take i
place outside primary containment, are maintained within the secondary containment boundary.
l The OPERABILITY requirements for SCIDs help ensure that an adequate secondary containment boundary is maintained during j
and after an accident by minimizing potential paths to the i
environment.
Isolation barrier (s) for the penetration are discussed in Reference ?..
The isolation devices addressed by this LCO are either passive or active (automatic).
Manual dampers, de-activated automatic dampers secured in 1
their closed position, check dampers with flow through the damper secured, and blind flanges are considered passive i
devices. Check dampers and other automatic dampers designed to close without operator action following an accident are considered active devices.
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Automatic SCIDs close on a secondary containment isolation signal to establish a boundary for untreated radioactive i
material within secondary containment following a DBA or 1
other accidents.
Other penetrations are isolated by the use of dampers or valves in the closed position g inp fla p j M APPLICABLE The SCIDs must be OPERABLE to ensure the secondary SAFETY ANALYSES containment barrier.to fission product releases is established.
The principal accidents for which the set:andary containment boundary is required are a loss of coolant accident (Ref.1) and a fuel handling accident in the fuel building (Ref. 3). The secondary containment perfoms no active function in response to each of these (continued)
RIVER BENO B 3.6-89 Revision No. O
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SCIDs
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B 3.6.4.2 l
BASES
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APPLICABLE limiting events, but the boundary established by SCIDs is l
SAFETY ANALYSES required to ensure that leakage from the primary containment i
(continued) is processed by the Standby Gas Treatment (SGT) System and Fuel Bui.1 ding Ventilation System before being released to the environment.
Maintaining SCIDs OPERA 8LE with isolation times within l
limits ensures that fission products will remain trapped i
inside secondary containment so that they can be treated by i
the SGT System or Fuel Building Ventilation System prior to j
discharge to the environment.
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SCIDs satisfy Criterion 3 of the NRC Policy Statement.
i LCO SCIDs form a part of the secondary containment boundary. The SCID safety function is related to control of offsite j
radiation releases resulting from DBAs.
l The power operated isolation dampers are considered OPERABLE when their isolation times are within limits. Additionally, i
power operated automatic dampers are required to actuate on j
an automatic isolation signal.
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The normally closed is lation damper or bl d flan are l
w a
p a
ni tiv cr r s automatic dam Tps era uw.ct hetet ano secured 'n their 1
closed positionCoe41tnd fJanges arp4n pipdyTEe'~5CIDs covered by this LCO, along witn their associated stroke tiimes, if applicable, are listed in Reference 4.
APPLICABILITY In MODES 1, 2, and 3, a DBA could lead to a fission product release to the primary containment that leaks to the secondary containment.
Therefore, OPERA 81LITY of SCIDs is required.
In MODES 4 and 5, the probability and consequences of these events are reduced due to pressure and temperature limitations in these MODES.
Therefore, maintaining SCIDs OPERA 8LE is not required in MODE 4 or 5, except for other situations under which significant releases of radioactive material can be postulated, such as during movement of irradiated fuel assemblies. Moving irradiated fuel assemblies in the Primary Containment is addressed adequately in LCO 3.6.1.10. " Primary Containment 4 hutdown."
(continued)
RIVER BEND B 3.6-90 Revision No. 0
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