ML19320D491
| ML19320D491 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/16/1980 |
| From: | Parker W DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML16148A336 | List: |
| References | |
| NUDOCS 8007210425 | |
| Download: ML19320D491 (4) | |
Text
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$ttam D*00wCtione 373-4083 July 16, 1980 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attent ion: Mr. R. W. Reid, Chief Operating Reactors Branch No. 4 Subj ect: Oconee Nuclear Station, Unit 2 Docket No. 50-270
Dear Mr. Denton:
Pursuant to 10CFR50, 550.90, the attached proposed amendment to the Oconee Nuclear Station Facility Operating License and revision to the Technical Specifications is subnitted. This proposed change temporcrily revises Technical Specification 3.3.1.c. to allow continued operation of Oconee' Unit 2 at full rated power while maincenance efforts continue on the "B" High Pressure Injection (HPI) pump until 2220, July 18, 1980. This is an additional 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> period of time beyond the allowable inoperability period for main-tenance.
The 2B HPI pump motor lower guide bearing f ailed at approximately 10:20 p.m. on Sunday evening July. 13, 1980. Work began immediately to repair this motor; upon inspection of the bearing following partial disassembly, it was determined that the most expeditious approach was the removal of the motor and replacement with a complete spare motor.
Following a continuous repair effort during the initial run of the uncoupled spare motor on Wednesday morning (installed on the motor stand), a motor rotor bar connection failed. This required the replacement of the spare motor and use of the original motor following
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bearing' repairs. This changeout proceeded to a point by 4 p.m. where final assembly is anticipated by midnight Wednesday night. Uncoupled test runs, coupling to the pump and performance verification are scheduled to be complete by 7 a.m. Thursday, July 17,1980, if no further difficulties are encountered. The spare motor which experienced the rotor failure had been satisfactorily tested at a manufacturer's shop in January, 1979.
8007210 9 5 g
Mr. Harold R. Denton Page 2 :
July 16, 1980 The bases for this request is provided in the following.
The extremely hot weather is severely taxing the abilities of utilities in the South to meet load requirements. Mid-South, Southern Company, and TVA have appealed to customers for conservation. Duke expects a load of 10,500 MW tomorrow (July 17, 1980) based on the forecast that hot !
weather will be more severe tomorrow. Duke's available capacity is expected to be 10,534 MW. Duke has purchased 300 MW of capacity from PJM through VEPCO for tomorrow. There is no other capacity available ,
for purchase, j The status of the Virginia Carolinas Reliability Group for tomorrow is: 1 Available Capability 30,255 MW Expected tuak 28,870 MW Reserves 1,385 MW (4.8%)
These figures include all capacity known to be available to VACAR from within and without.
Duke is planning to issue an appeal for conservation eo its customers for July 17, 1980. ,
Duke's load today (July 16) was 10,364 MW at 3 p.m. This was about 270 MW greater than expected based on yesterday's load (9907 MW @ 6 p.m.)
and is 736 MW greater than was forecast for July. Reserves were approximately 312 MW (3%) today. Duke is losing a 142 MW unit with a boiler tube leak. Duke is using all available generation units (oil, hydroelectric, fossil, nuclear) to the extent possible. 0:onee Unit 2 at full power is essential to Duke meeting its exp. 'ted loads the remainder of the week.
The current HPI system lineup has the "A" pump opera _ ag providing makeup and reactor coolant pump seal injection flow. Valve HP-26 is normally closed, but opens on Engineered Safeguards (ES) actuation signal to provide a flow path. This valve was verified operable in June,1980 during the performance of periodic sutveillance tests.
To reduce the probability that this valve will not properly function, an operator will be stationed to assure that valve HP-26 opens in the event of an Engineered Safeguards actuation.
The HPI "C" pump is in standby. The ES actuation valve (HP-27) is normally open. This pump was verified operable in June, 1980 during the performance of periodic surveillance tests. Additionally, al.~
power supplies, instrumentation and controls, and auxiliary support systems for the HPI system are operable. No maintenance has been or will be initiated on any system that may degrade the reliability of the HPI system.
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Mr.1 Harold R. Denton Page Julyfl6, 1980-
. Furthermore,' to assure early detection of'any increase in Reactor Coolant System Icakage, the computer-leak rate calculation will be per-formed every'four hours. This additional measure will assure that
. prompt and appropriate operator action can be taken in ~he event that any increase in system Icakage occurs.
The existing Ltechnical specification requiring the operability of three HPI pumps,.instead of two HPI pumps, is based on consideration of the assumed occurrence of the limiting single failure in the HPI system during'certain postulated small breaks (in the primary system cold leg piping) of a very. narrow spectrum of leak sizes (0.04 - 0.1 sq. ft.) in the' vicinity of the HPI nozzle for which the associated HPI flow is
- assumed to be lost. For breaks occurring in the hot legs or pressurizer only one-pump, assuming a single failure of another pump, is necessary the probability of occurrence of this unique break and the simultaneous limiting single failure is very small. Also, the requested temporary period of permissible Einoperability of one high pressure injection pump is of comparable duration allowed for maintenance and testing of individual trains of. safety systems. Therefore, this proposed temporary change in Technical' Specification 3.3.1.C(2) is considered not to pose any significant increase in plant risk, i l
It is. requested that this request be approved immediately in order to prevent any power reduction of Oconce Unit 2.
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- This proposal is considered to consist of one Class III and two Class I license amendments. .Therefore, pursuant to 10CFR'.70, please find a
- check in the amount of $4,800.
l Ve truly yours, t> _. /J .
/\ -
William 0.~ Parker, Jr.
RLG:vr At taclunent N
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-Mr.' Harold.R. Denton-Page 4:
July 16, 1980 WILLIAM O. PARKER, JR., being duly sworn, statcs that he is Vice President
.of Duke' Power Company; that.he is authorized on the part'of said Company to' sign and file-with the Nuclear' Regulatory Commission this request for amendment of-the~0conce Nuclear Station Technical Specifications, Appendix A'to Facility Operating Licenses.DPR-38, DPR-47', and'DPR-55; and that all
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statements and matters set forth therein are true and correct to the best of.h / knowledge.
, se iA ' & . M ' L f<*'
William O. Parker, Jr., Vi Q esident Subscribed and sworn to before me this 16th day of July, 1980
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Notary Public-My Commission Expires:
-February 15, 1982 l
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