ML19207B937
| ML19207B937 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/20/1979 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7909060146 | |
| Download: ML19207B937 (3) | |
Text
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UNITED STATES
,. f* i NUCLEAR REGULATORY COMMISSION i '9//
i WASHINGTON. D. C. 20555 i,'f dill 2Qg MEMORANDUM FOR:
T. Ippolito, Chief, Operating Re2ctors Branch 13, Division of Operating Reactors FRCM:
G. Lainas, Chief, Plant Systems Branch, Division of Operating Reactors
SUBJECT:
PEACH BOTTOM, UNITS 2 AND 3, REQUEST FOR ADDITIONAL INFORMATION FOR CEGRADED GRID VCLTAGE (TAC 10040 & 10039)
Plant Name: Peach Bottom, Units 2 and 3 Docket Nos.: 50-277 and 50-288 Responsible Branch: CRB #3 Project Manager:
D. Verrelli Reviewing Branch: Plant Systems Branch Status: Awaiting Information In response to Technical Assistance request TAC 10040 and 10039, the Plant Systems Branch has reviewed the licensee's submittal of December 22, 1977 and found that additional information 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.
r, G. Lainas, Chief Plant Systems Branch Division 'of Operating Reactors
Contact:
S. Rhow, X28077 J. Ibarra, LLL
Enclosure:
As stated 7 909 060l4G
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D. Eisenhut W. Gammill B. Grimes D. Verrelli G. Lainas D. Tandi M. Chiramal P. Shemanski S. Rhow J. Ibarra, LLL O i.
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- t REQUEST FOR ADDITIONAL INFORMATION PEACri BOTTOM, UNITS 2 ANQ 3 DEGRADED GRID VOLTAGE (TAC 10040 and 10039) 1.
Staff Position 1 part e, NRC letter June 2,1977, states that the voltage monitors shall be designed to satisfy the requirements of IEEE 279-1971. The intent of this position is that the moni-tors provide undervoltage protection to the ESF load. The monitors are to be part of the Class IE distribution system.
Your proposed modification of monitoring the 13 KV line as opposed to the monitoring the 4160V energency but is not found acceptable.
Modify your scheme to meet all the staff positions stated in the NRC letter of June 2,1977.
Also provide sufficient information (voltage drop analyses) to allow our independent verification that the undervoltage protec-tion voltage setpoint and time delay selected will not cause spurious separation of safety buses from offsite powen 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 connecticns 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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