ML18043A693
| ML18043A693 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 05/08/1979 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-01.A, TASK-8-1.A, TASK-RR NUDOCS 7905240731 | |
| Download: ML18043A693 (4) | |
Text
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MAY *s 1979 DISTRIBllII..Q__N:
CCentra l Files>
NRC PDR Read fog Fil es D. Ziemann, Chief,. Operating Reactors Branch #2, DOR FROM:
- G.* Lainas, Chief~ Plant System~ Brancp, DOR
\\
SUBJECT:
PAL I SADES PLANT, REQUEST. FOR. ADDITIONAL INFORMATION FOR DEGRADED GRID VOLTAGE (TAC l 0043}
Plant Name:
Palisades Plant Docket No. :. 50-255.
Responsible Branch:
ORB#2
- Pr_oje.ct ManC!_ger: *.D. Silver.
Reviewing Branch:* Plant Systems Br!}nch Status:* Awaiting 'Infor'!liltion.
In response to technical assistance request TAC 10043, :the Plant Systems BBanch has. reviewed the licensee's submittal of October. 2,-
1978, and fo.und that additional information ';s required in order to c9mplete our review.*.
The attache_d* request for. additionai information should be fo"'1arded to* the 1.icen_see.
J.
G; Lainas, Chief Pl ant *Systems Branch
- ojvision of Operating Reactors
Enclosure:
As stated
- Contact:
S.Rhow X.. 28077 cc:. See next page
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UNITED STATES
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. NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 MAY 8 1979 MEMORANDUM FOR:
D. Ziemann, Chief, Operating Reactors Branch #2," DOR FROM:
G. Lainas, Chief, Plant Systems Branch, DOR
SUBJECT:
PALISADES PLANT, REQUEST FOR ADDITIONAL INFORMATION FOR DEGRADED GRID VOLTAGE (TAC 10043)
Plant Name:
Palisades Plant Docket No.:
50-255 Responsible Branch:
ORB#2 Project Manager:
D. Silver Reviewing Branch:
Plant Systems Branch Status: Awaiting Information In response to technical assistance request TAC 10043, the Plant Systems Branch has reviewed the licensee's submittal of October 2, 1978, and found that additional information is required in order to complete our review.
The attached request for additional information should be forwarded to the licensee.
Enclosure:
As stated
Contact:
S. Rhow X-28077 cc:
See next page Plant Sy ms Branch Division of Operating Reactors
cc w/enclosure:
V. Stello D. Eisenhut R. Vollmer W. Russell B. Grimes D. Silver G. Lainas D. Tondi P. Shemanski
,, ~
REQUEST FOR ADDITIONAL INFORMATION PALISADES PLANT DEGRADED GRID VOLTAGE (TAC 10043)
- 1.
Your response to position 1 (f) is unacceptable.
The situation of a reactor trip while the grid is in a degraded state is one possibility, for example.
Therefore,.your statement that off-site power is used only during shutdown mode is not totally correct.
- 2.
Please submit technical specification changes to comply with our June 3, 1977 letter. These changes should comply as close as possible to the Model Technical Specifications (MTS) and should also include the limiting conditions for operation, surveillance requirements, nominal set-points with minimum and maximum limits for first level voltage protection (loss-of-voltage) as shown in the MTS.
- 3.
Please explain why your choice of a 3/3 coincident logic is acceptable from a safety standpoint (as contrasted to a 2/3 coincident scheme).
Schematics of the proposed relaying circuits and types of relays being used are also requested.
- 4.
Will the proposed relays and other components. of the circuit be seismically and environmentally qualified?
- 5.
Has an analysis been performed to detennine if the proposed 6 second time delay is of long enough duration to take into account the starttng time arid consequential voltage drops from large motors on the bus?