05000289/LER-1978-027, Forwards LER 78-027/01T-0.W/o Encl

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Forwards LER 78-027/01T-0.W/o Encl
ML20062C198
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 10/27/1978
From: Herbein J
METROPOLITAN EDISON CO.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 7811070191
Download: ML20062C198 (1)


LER-2078-027, Forwards LER 78-027/01T-0.W/o Encl
Event date:
Report date:
2892078027R00 - NRC Website

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, METHOPOLn AN EDl SON COMPANY n:ss.wr:ccensuu::su::lr:uniscwour:an/

POST OFFICE BOX 542 REAOING, PENNSYLVANIA 196C3 TELEPHONE 215 - 929 3ti01 October 27, 1978 GO,L 1732 Mr. R. H Grier, Director Office of Inspection and Enforcement Regi.on 1 U. S. Nuclear Regulatory Commission

631 Park Avenue

,,. King of Prussia, Pennsylvania 19406

..+.

Dear Sir:

Three Mile Island Nuclear Station, Unit 1 (TMI-1)

Operating License No. DPR-50 Docket No. 50-289 Attached please find an update to Licensee Event Report 78-27/OlT-0, as requested by Mr. Haverkamp in a telephone call to Mr. W. E. Potts on September 29, 1978.

Sincerely, N#7

' J. G. Herbein

- Vice President-Generation JGE:DGM;tas Attachment V

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7811070/9/ 5

U. S. NUCLEAR RECULATORY COMMISSION NLC FOftet 346

. *l1 711' LICENSEE EVENT REPORT CONTROL 8 LOCK: I 1

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REPORT DATE 7 8 60 61 OOCKETNUMSER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h iOI2l l Luring transmitter calibration, it was noted that the actual level of 12.k2 ft. of [

l t O !al l borated water in the "3" C.F.T. was less than the minimum allowable level of 12.55 go,,;; ft., thus violating T.S. 3.3 1.2.a. It was detemined that there was no threat to ]

l I O I s 1 l the health and safe'4 of the public.

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g i ; o ; ; A level transmitter calibration was being conducted due to different levels l

ii ,3 i g indicated on redundant channels. When it was determined that the correct channel

,, ,7j l shoved that the tank was out of specification, borated water was added to bring the I l

g l tank to within T.S. limits.

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[TTil8 9I Zl@l NA 7 10 So ISSUE DESCRIMtON 7$b o O / ()/ llllllltlll1ij g [,Yfj@l Weekly News Release l 68 69 80 5 7 8 9 10 f NAME OF PREPARER D. G. Mitchell PHcNE:

NARRATIVE TO LER 78-027/1T-1 On September 1,1978, it was determined that the "B" Core Flood Tank. (CFI) contained a volume of horated water ess t an t e in um a wed. The 3

minimum allowable volume of 1010 ft is equivalent to a level of 12.55 ft.

The actual level was 12.42 ft., a violation of Technical Specification 3.3.1.2a and reportable per T.S. 6.9.2.A.2.

The occurrence was noted during a surveillance conducted on the Core Flood Tank pressure transmitters. Af ter the surveillance was performed on the PT3 pressure transmitter and that transmitter valved back into service, the associated level channel, LT3, indicated a level of 12.69 ft., and the alarm actuated. However, LT4 level indicator was indicating a higher level and was believed to be correct, therefore, LT3 was placed out of service.

The lines to the LT3 level transmitter were blown down to clean them and provide a more accurate reading. Af ter this was accomplished, LT3 level indicator read 12.42 ft. This reading was then believed correct and borated water was i= mediately added to bring the volume in the tank within Technical Specification limits. Level transmitter LT4 was then checked and found to be out of specification. LT4 was recalibrated and returned to service.

The' alarm on the level indicator system actuates when the level reaches 12.70 ft. The alarm connected to channel LT3 did actuate at its proper level. However, that channel was thought to be showing an incorrect level, and was takea out of service for calibration.

The alarm from channel LT3 did not sound until the pressure transmitter calibration had been completed. Previous to that test, both channels were indicating a level within* the alarm setpoints. Therefore, it was not known how long the tank was out of specification.

The fluid loss from the tank was believed to be caused by the monthly sampling which requires 25-30 gallons of fluid for each test.

At the present time, the procedures require the level to be checked once per day. A review is under way to determine if the transmitter should be replaced.

Should the review indicate that the transmitters should be replaced, it is i anticipated that this change would take place during the 1979 refueling outage.

It has been determined that the out-of-limit volume for the "B" Core Flood Tank did not constitute a threat to the health and safety of the public, in that all other engineered safety features were operable, and the "A" Core Flood Tank had

( greater than the minimum required level. Therefore, the combined volumes of the

! "A" and "B" Core Flood Tankswould have been suf ficient to reflood the core.

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