ML20010E144
| ML20010E144 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 08/29/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| References | |
| TASK-07-06, TASK-7-6, TASK-RR LSO5-81-08-077, LSO5-81-8-77, NUDOCS 8109030139 | |
| Download: ML20010E144 (4) | |
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i August 29, 1981 p y L
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'W Mr. I. R. Finfrock, Jr.
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Vice President - Jersey Central
-! O tP 0 3193; s b Power & Light Company 32 5 Lea g % ~/
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A.d Post Office Box 330 Forked River, riew Jersey 03731 I;',
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j Dear I'r. Finfrock-
SUBJECT:
SEP TOPIC VII-6, FREOUEtiCY DECAY SAFETY EVALUATI0i! FOR OYSTER CREEK The enclosed staff safety evaluation is based on 6 contractor docunent that has been nade available to you previously.
This evaluation is the j
staff's position rega: ding design of your facility in the subject area.
1 Wita regard to the referenced topic, the staff has concluded that your facility meets current licensing criteria.
Sincerely, Dennis M. Crutchfield, Chief Operating Reactors P, ranch No. 5 Division of Ltcensing
Enclosure:
As stated cc w/ enclosure:
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OFFICIAL RECORD COPY o.ao i si-2 i2 w r.ac ron > 3 e m n NRCM Cm
Mr.' !. R. Fi nf rock, J r.
CC G. F. Trewbridge, Esquire Gene Fisher Shaw, Pittman, Potts and Trowbridge Bureau Chief 1500 M Street, N. W.
Bureau of Radiation Protection Washingtor., D. C.
20036 380 Scotts Road Trenten, New Jersey 08628 J. B. Lieberman, Esquire Berlack, Israels & Lieberman Cocai ssioner 26 Broadway New Jersey Department of Energy New Ycrk, New Yor< 10C04 101 Corrarce Street Newark, New Jersey 07102 Natural Rescurces Defense Council 91715th Street, N. W.
Licensing Supervisor Wasningtcn, D. C.
20006 Oyster Creek Nuclear Generating Station J. Knubel P. O. Box 388 SWR Licensing Manager Forked River, New Jersey 08731 Jersey Central Power & Light Conpany Madison Avenue at Punch Bowl Road Resident Inspector Morristcwn, New Jersey 07960 c/o V. S. NRC P. O. Box 445 Joseph
'.J. Ferraro, J r., Esquire Forked River, New Jersey" 08731 Deputy Attorney General.
State of New Jersey Department of Law and Public Safety 1100 Raymond Sculevard Newark, New Jersey 07012 Ccean Ccunty Library Brick Tcwnship Branch 401 Chambers Bridge Road Brick Town, New Jersey 08723 Mayor Lacey Tcwnship P. O. Box 475 Forked River, New Jersey 08731 Commissioner Department of Public Utilities State of New Jersey 101 Commerce Street Newark, New Jersey 07102 U. S. Envircnmental Protection Agency Region II Office ATTN: EIS COCRDINATOR 25 Federal Plaza New York, New York 10007
_SYSTEfMTIC EVALUATION PROGRAM TOPIC VII-6 OYSTER CREEK TOPIC VII-6 FREQUENCY DECAY I.
Introduction Iseue 9 of f;0 REG-0138 states that the staff should requ. ire that a post-ulated rapid decay of the frequency of the,offsite power system be included in the accident analysis and that the results be demonstrated to be acceptable. Alternatively, the reactor coolant pump (RCP) circuit breakers should be designed to protection system criteria and tripped to separate the pump motors from the offsite power system because rapid decay of the frequency of offsite power system has the potential for slowing down or braking the RCP thereby reducing the coolant flew rates to levels not considered in previous analyses.
~
II.
Review Criteria The review criteria for reactor trip systems are preser.ted in Table 7-1 of the Standard Review Plan.
III.
Related Safety Tocics and Interfaces Set Points (Topic VII-1. A) and Degraded Grid (Topic VIII-1.A) are relat-ed review areas that are outside the scope of this Topic.
sithough Topic VIII-1.A is not dependent on the present topic for comp-
.etion, the conclusions with ragard to frequency decay should be compat-atle.
l IV.
Review Guidelines Issue 9 of fiUREG-0138, " Staff Discussion of Fifteen Technical Issues Listed in Attachment to flovember 3,1976 Memorandum from Director, fiRR to f1RR Staff," provides suitable guidance for this review.
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V.
Evaluation Oak Ridge fiational Laboratory (ORNL), under a technical assistance program, reviewed the frequency decay rate phenomsna and its effects on RCP's. The results of the review are presented in Section 4 of fiUREG CR 1464, " Review of fluc~. car Power Plant Offsite Power Source Reliability and Related Recom-mended Changes to the fiRC Rules and Regulations."
In suranary, the report shows that the conditions required for dynamic braking of reactor coolant pumps are a sustained and rapid decrease in frequency while maintaining bus voltage. These conditions are only realind in a highly capacitive system using large amounts of buried transmission cables (such as Long
. Island). The Jersey Central Power and Light system does not use large amounts of buried transmission cable.
VI.
Conclusion The conditions necessary for an unacceptable frequency decay rate are not present in the Oyster Creek offsite electrical distribution system.
Acccrdingly, the staff considers this issue not to be applicable to Oyster Creek.
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