ML20087A915

Rept of Assist Insp on 700924-25 to Obtain Info on Reported Power Oscillation & Spikes Attributed by Licensee to Problems W/Turbine Control Sys

ML20087A915
Person / Time
Site:	Oyster Creek
Issue date:	10/20/1970
From:	Harold Denton, Farmer W US ATOMIC ENERGY COMMISSION (AEC)
To:
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ML20086U000	List: ML20086U112 ML20086U115 ML20086U121 ML20086U134 ML20086U140 ML20086U146 ML20086U150 ML20086U163 ML20086U169 ML20086U171 ML20087A013 ML20087A017 ML20087A033 ML20087A036 ML20087A050 ML20087A057 ML20087A095 ML20087A099 ML20087A104 ML20087A108 ML20087A120 ML20087A164 ML20087A168 ML20087A174 ML20087A181 ML20087A185 ML20087A198 ML20087A206 ML20087A211 ML20087A215 ML20087A220 ML20087A229 ML20087A242 ML20087A251 ML20087A257 ML20087A269 ML20087A287 ML20087A296 ML20087A319 ML20087A484 ML20087A519 ML20087A556 ML20087A566 ML20087A578 ML20087A597 ML20087A600 ML20087A609 ML20087A620 ML20087A622 ML20087A628 ... further results
References
FOIA-95-36 NUDOCS 9508070220
Download: ML20087A915 (29)

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{{#Wiki_filter:Q ^ 9 --[ :[ * . g e. m REPORT OF ASSIST INSPECTION ~ Licensee: Jersey Central Power &' Light Co. n Oyster Creek 1 Docket No. 50-219 Dates of Inspection: September 24 and 25, 1970 Inspected By: ' ho M/M/70 W. S. Farmer, Senior Nuclear Engineer Date ? Reviewed By: If27/]MA / !0!2o!7& . (46enton, Chie cal Support Branch 'Date Proprietary Information: None SCOPE An inspection was made on September 24 and 25,1970, of the Oyster Creek Unit 1 Nuclear Power Station to obtain further information on re-ported power oscillation and spikes attributed by the licensee to problems with the turbine control system. The inspection was made by R. McDermott,. CO:I and W. S. Farmer, CO:HQ.

SUMMARY

1. The Oyster Creek i nuclear station between September 17 and 25 experi-enced two scrams and had to reduce power on at least three separate occasions because of oscillatory or eratic power output. All five events were directly related by plant operating personnel to turbine inlet valve control system problems. The spikes in power output were attributed to plugging of filters or valve ports in the hydraulic system serving the electrohydraulic pilot valve which controls turbine inlet valve positions. The oscillatory power output was attributed to the fact that the profile on the turbine inlet valve control cams did not match correctly the valve percent open versus flow character-ist ics. The turbine inlet valves tend toward unstable cyclic behavior with increase in power in the range of plant power outputs from about 400 to 530 MWe when on epr control. 2. Both Jersey Central personnel and representatives of the supplier, G-E, were evaluating the above problems. In order to keep dirt out 9500070220 950227 PDR FOIA DEKOK95-36 PDR

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! l t filters on the hydraulic system supplying the servo pilot valve had been replaced infrequently and no significant dP increases had been observed across the filters.. There had been-a few spikes and control' valve cycling of a minor nature observed earlier in the year. The 1 recent unstable control events that occurred on September 17 had been initiated, they believed, by back washing the condensers. Back wash . operations had been conducted during the summer while at full power 1 without " upsets." Jersey Central informed us that they intended to-i reduce power to an appropriate level prior to back washing the con-denser in subsequent operations. The epr control system has given trouble at various times since the l Oyster Creek 1 startup. Some of the earlier experiences with epr con-troller malfunction, dirt in the pilot valve and mechanical linkage binding are discussed in Reactor Operating Experiences (ROE) 70-9, " Pressure Regulator Tuning." The amplifiers in the epr system were giving difficulties earlier this year and were to be replaced by G-E. At the time of the current problems in the period September 17-24', the replace-ment amplifiers had been delivered but had been returned to G-E for correction. V. CORRECTIVE ACTIONS AND SUBSEQUENT EVENTS During the week of September 21, the hydraulic supply system filters were cleaned and replaced. An additional set of 1/2 micron filters were installed in series with and after the existing after-filter. These' changes were made to eliminate the pilot valve plugging difficulties. The G-E service representa'tive had taken new data on valve travel. versus steam flow. New cams are to be supplied by G-E and be installed j during the next outage. The new came are supposed to provide proper control in the higher power range involved in reaching stretch capacity. This will hold for both the mini-stretch and maxi-stretch. The Jersey Central--Cyster Creek maintenance personnel had visually. checked all of the mechanical linkage in the bypass valve and turbine inlet valve control systems. They also dye checked.the links for evidence of any cracks. G-E is planning to make a careful review of their mechan-ical linkage design. They plan to install bigger links or use steel in place of aluminum for added strength. These changes are to be made in the next extended outage. They also are considering placing covers over the linkage to protect them from inadvertent damage. (They are now open and running between - _. _, _. ~..

f:.. ir s .+ .f L t E steam pipes below the front standard of the turbine.) The broken tube is to be returned to Schenectady for metallurgical examination in the next shutdown. Hopefully, this will enable them to determine the cause of failure. They have already reviewed their mechanical stress calcula-tions for the linkage. They plan to check these against the strain gage measurements on the broken link. The personnel from the LSTD of G-E indicated a report on the results of their evaluation of the linkage failure would be made available to Jersey Central and the Compliance in-i spector would be permitted to review it. ~ Recognizing that the same cama were still present, the Jersey Central operating staff indicated that they would drop back load to around 450 MWe and go on the mechanical pressure regulator if they continued to have ~ trouble with the epr. On starting up the Oyster Creek 1 plant on September 25 they immedi- ) ately experienced probless from set point drift with the epr. The problem was believed to be caused by difficulties in the electronic bridge circuit of the epr. In the subsequent week it was reported by telephone that the plant dropped load and went back onto the apr control on several occasions. Poor ground connections and leakage paths were found in the epr electrical circuits. The potentiometers were stated to have been changed out and the replacement amplifiers were received and installed in the epr electronic system. During the week of September 28, it was j also reported by telephone that probleam developed in the feedwater con-trol circuit in one of the feed pump flow signals. As of this date it is understood that the problems above have been corrected and the planc is back up to 530 MWe and operating satisfactorily.

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