ML20148B177
| ML20148B177 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 12/18/1979 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001210150 | |
| Download: ML20148B177 (2) | |
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hp MEMORANDUM FOR:
T. Ippolito, Chief ij Operating Reactors Branch #3 Division of Ocerating Reactors FROM:
G. Lainas, Chief Plant Systems Branch Division of Operating Reactors
SUBJECT:
RECUEST FOR ADDITIOliAL INFORFATION - CONTAINMENT PURGE SYSTEM - BROWNS FERRY UNITS 1, 2, AND 3 (TAC 10187)
Plant Nare:
Browns Ferry Units 1, 2, and 3 Docket Nos. : 50-259/250/296 Project Manager:
R. Clark
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Review Status: Awaiting Infornation The Plant Systems Branch has identified the enclosed additional infomation as being required with 30 days in order tnat we can complete our evaluation of :ne electrical override / bypass aspects of tne containment purge matter on schedule.
G. Lainas, Chisf Plant Systems Branch Division of Operating Reactors Con tact:
R. Scholl,.127162
Enclosure:
Request for Additional Infomation cc w/ enclosure:
D. Eisennut D. Tondi 96024305
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ENCLOSURE e
REQUEST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE SYSTEM AN_D CONTAINMENT VENTING SY5iEM Foi BROWNS FERRY UNITS 1, 2 AND 3 DOCKET NOS. 50-259/260/296 1.
The docketed information as to the design of Engineered Safety Features (ESF) such as the Containment Ventilation Isolation (CVI) systems does not adequately address the following areas.
i Please discuss how your design confonns with each:
1.
The overriding
- of one type of safety actuation signal j
(e.g., radiation) should not cause the blocking of any 1
other type of safety actuation signal (e.g., pressure) to the isolation valves.
2.
Sufficient physical features (e.g., key lock switches) should be provided to facilitate adequate administrative controls.
3.
The system-level annunciation of the overridden status should be provided for every safety system impacted when an override is active.
4.
Diverse signals should be provided to initiate isolation of the containment ventilation system. Specifically, containment high radiation, safety injection actuation, and containment high pressure should automatically initiate Containment Ventilation Isolation (CVI).
5.
The instrumentation and control systems provided to initiate ESF should be designed and qualified as safety-grade equipmen 6.
The overriding or resetting
- of the isolation actuation signal should not cause the automatic motion of any ESF valve.
- The following cefinitions are given for clarity of use ir, this issue:
Override - the signal is still present, and it is blocked in order to perform a function contrary to the signal; ** Reset - the signal has come and gone, and the circuit is being cleared to return to the normal condition.
98024506
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