ML19253A666
| ML19253A666 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/20/1979 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7909100642 | |
| Download: ML19253A666 (3) | |
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[ T.#,y i NUCLEAR REGULATORY COMMISSION
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f WASHINGTON. O. C. 20555
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JUL 2D 1973 s
MEMORANDUM FOR:
T. lppolito, Chief, Operating Reactors Branch #3, Division of Operating Reactors FRCM:
G. Lainas, Chief, Plant Systems Branch, Division of Operating Reactors
SUBJECT:
BROWNS FERRY, LNITS ', 2 AND 3, REQUEST FOR ADDITIONAL INFORMATION FOR DEGRADED GRID VOLTAGE (TAC NOS.
10010, 10011, and 10012)
Plant Name: Browns Ferry, Units 1, 2 and 3 Occket Nos.:
50-259, 50-260, and 50-296 Responsible Branch: ORB #3 Project Manager:
R. Clark Reviewing Branch: Plant Systems Branch Status: Awaiting Infomation In response to technical assistance request TAC 10010, 10011, and 10012, the Plant Systems Branch has reviewed the licensee's submittal of May 12, 1978 and found that additional infonnation is required in order to complete our review.
The attached request for additional infonnation should be forwarded to the licensee as soon as possible with a request for response within 45 days.
G. Lainas u Chief Plant Systems Branch Division of Operating Reactors
Contact:
S. Rhew, X28077 C. Cleveland, EG&G
Enclosure:
As stated 7 909 I occy y f;3. 21 D
. cc w/ enclosure:
D. Eisenhut W. Gamill B. Grimes R. Clark G. Lainas D. Tandi M. Chiramal P. Shemanski S. Rhow C. Cleveland, EG&G
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REQUEST FOR ADDITIONAL INFORMATION BROWNS FERRY UNITS 1, 2 and 3 DEGRADED GRID VOLTAGE (TAC NOS.
10010.'10011, and 10012)
Upon review of your submittal dated May 12, 1978, for second level undervoltage protection it has been determined that the following addi-tional information is required to complete our evaluation:
1.
Staff position (1)(f) requires that the Technical Specifications shall include limiting conditions for operation, surveillance requirements, trip setpoints with minimum and maximum limits, and allowable values for second level undervoltage monitors.
Staff position 3 states the criteria for testing requirements. of our June 3,1977 letter shows all the criteria of staff positions (1)(f) and 3 in Model Technical Specification (MTS) format.
A review of your Technical Specifications reveals that the criteria will not be met without changes. Please furnish proposed changes to comply with the criteria including loss-of-voltage setpoints, allowable limits and testing capabilities. These changes should also tilow MTS format as close as possible.
2.
Staff position (1)(e) states that the voltage monitors shall be designed to satisfy the requirements of IEEE 279-1971.
Confirm that your design satisfies these requirements by documenting and describing such requirements as seismic and environmental qualification, class lE qualifications, independence, redundant, reliability and testability and others pertinent to the design.
3.
Provide sufficient information (voltage drop analyses) to allcw our independent verification that the undervoltage protection voltage setpoint and time delay selected will not cause spurious separation of safety buses from offsite power during all modes of plant operation (start-up, shutdown, power operation and accident condition) due to automatic or manual starting of large motors, bulk or sequential loading or automatic transfer of electrical loads. The analyses should include conditions when the safety buses are supplied power from the Unit Auxiliary Transformer, the Start-up/ Reserve transformer or other available offsite connections and assuming the need for electrical power is initiated by an anticipated transient (e.g., unit trip) or an accident,.
whichever presents the largest load demand.
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