ML19345C898
| ML19345C898 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 10/24/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| References | |
| NUDOCS 8012080574 | |
| Download: ML19345C898 (4) | |
Text
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',g NUCLEAR REGULATORY COMMISSION i
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October 24, 1980 g
Docket No. 50-219 f3
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{f' E5 Mr. I. R. Finfrock, Jr.
Vice president
%72 Fe c-M Jersey Central Power & Light Company C
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i3 Oyster Creek Nuclear Generating Station Q
Forked River, New Jersey 08731
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o P. O. Box 388
Dear Mr. Finfrock:
1 We are continuing our review of the generic issue of onsite power systems for the Oyster Creek Nuclear Generating Station and have found that additional information described in the enclosure to this letter is needed. We request your response within 45 days of receipt of this letter.
Sincerely,
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Dennis M. Crutc1 ield, ief Operating Reactors Branch #5 Division of Licensing
Enclosure:
Request for Additional Information cc w/ enclosure:
See next page
%012 08 0 57'f f
g 1 October 24, 1980 Mr. I. R. Finf rock, J r.
cc G. F. Trowbridge, Esquire Gene Fisher Shaw, Pittman, Potts and Trowbridge Bureau Chief 1800 M Street, N. W.
Bureau of Radiation Protection Washington, D. c.
20036 380 Scotts Road Trenton, New Jersey 08628 GPU Service Ct rporat ton ATTN. Mr. E. G. Wallace Comissioner Licensing Manager New Jersey Department of Energy 260 Cherry Hill Road 101 Comerce Street Parsippany, New Jersey 07054 Newark, New Jersey 07102 l
Natural Resources Defense Council Plant Superintendent 91715th Street N. W.
Oyster Creek Nuclear Generating Washington, D. C.
20006 Station P. O. Box 388 Forked River, New Jersey 08731 Steven P. Russo, Esquire 248 Washington Street Resident Inspector P. O. Box 1060 c/o V. S. NRC Toms River, New Jersey 08753 P. O. Box 445 Forked River, New Jersey 08731 Joseph W. Ferraro, Jr., Esquire Deputy Attorney General Director, Technical Assessment Div.
State of New Jersey Office of Radiation Programs Department of Law and Public Safety (AW-459) 1100 Raymond Boulevard U. S. Environmental Protection Newark, New Jersey 07012 Agency Crystal Mall #2 Ocean County Library Arlington, Virginia 20460 Brick Township Branch 401 Chambers Bridge Road U. S. Environmental Protection Brick Town, New Jersey 08723 Agency Region II Office Mayor ATTN: EIS COORDINATOR Lacey Township 26 Federal Plaza P. O. Box 475 New York, New York 10007 Forked River, New Jersey 08731 Comissioner i
Department of Public Utilities i
State of New Jersey 101 Commerce Street
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Newark, New Jersey 07102 1
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I ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION THE OYSTER CREEK PLANT DEGRADED GRID VOLTAGE 1.
In Reference b, Tables II and III, a voltage of 3735V at SWGR IC and 3673V at SWGR 10 are rec orded for a grid voltage of 212.75kV.
In Reference a, Tab od 3, a voltage of 3635V at SWGR 1C for a grid vo, o f 214.8kV and 3635V at SWGR ID for a grid voltage t 3kV is recorded.
If the voltage regulators have be-illed, as described in Reference b, page la, why a-analyzed voltages in Reference a, Tables I and 2, s-lower than the previo>s lower analysis?
2.
If the voltages in Ref erence a, Tables 2 and 3: are indeed correct, then the U.V. relay setpoint is within your expected grid operating band, as described in Reference b, Attachment 1, Item 9.
This brings to light either of two possibilities:
(a) the onsite distribution system is inadequate for the expected grid voltages (212.75 to 238kV) as at 212.75kV, the safety bus voltages and motor terminal voltages will be below the equipment rated voltage, or (b) the offsite grid will be separated in the bus operating voltage band, causing spurious trips from a good offsite power source.
This latter possibility would be a violation of GDC 17.
Please discuss the situation at your facility including the basis for your design.
3.
In Table ? -f Reference a, the CRD feed and C.S. BSTRs on USS 1A2 (1B2); and in Table 3 of the same reference, the fuel pool FLTR on MCClA21 (1821) have voltages below the allowed minimum of 414 volts at the selected setpoint of the undervoltage relays.
This equipment is, therefore, not protected from thermal damage.
The relay setpoint may need to be changed.
Indicate how you propose to protect this equipment.
4.
Reference a, Table 5 shows a verification by less than one percent difference between the measured and analyzed voltages.
What was the actual percent of full load on these buses during test?
5.
Are the voltages on MCC buses within their starters rating?
6.
Reference a Table 5 does not include MCC and worst-case motor terminal voltage verification.
It should be provided.
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References:
a.
JCP&L letter (I.R. Finfrock, Jr.) to NRC (Director) dated j
August 11, 1980.
I b.
JCP&L letter (I.R. Finfrock, Jr.) to NRC (Director) dated Noventer 1,1979.
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