05000369/LER-1981-059, Forwards LER 81-059/03L-0.Detailed Event Analysis Encl

Forwards LER 81-059/03L-0.Detailed Event Analysis Encl

ML20005A033
Person / Time
Site:	McGuire
Issue date:	05/18/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A034	List: 05000369/LER-1981-059, Forwards LER 81-059/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-059-03, /03L-0:on 810418,during Mode 3,while Settling Pond Water Being Released,Conventional Waste Water Discharge Flow Meter Strip Chart Recorder Did Not Match Meter Digital Readout.Caused by Switch Not Set to Level
References
NUDOCS 8106290275
Download: ML20005A033 (3)

LER-1981-059, Forwards LER 81-059/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981059R00 - NRC Website

text

', '

I DUKE POWER COMPANY Powsm Bcat.nswo i

422 Soota Caracs Srszer. CHARI.OTTz. N. C. asa4a 2:;

wiww o.==an en.sm.

/ e. a.m ec.'

May 18, 1981 tr.c.-o c: a.e. ro.

373- 083 S ec.= *noowctio's Mr. J. P. O'Reilly, Dir ector U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re: McGuire Nuclear Station Unit 1 Docket No. 50-369

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-59. This report concerns the flow rate measuring device for the Conventional Waste water treatment line being declared inoperable. This incident was considered to be of no significance with respect to the health and safety c# the public.

Very truly yours, William O. Parker, Jr.

RWC/djs Attachment ec: Director Mr. Bill Lavalee Of fice of Management and Program Analysis Nuclear Saf ety Analysis Centet-U. S. Nuclear Regulatory Commission Post Office Box 10412 Washington, D. C. 20555 Palo Alto, Cali:fornia 94303 Ms. M. J. Graham in t

Resident Inspector-NRC

[

' O McGuire Nuclear Station feg

{ll d{

J' II 2 6 ISS1 m Te L1 J

N "2L*J; l== E

\\W 4s n

s

'b

\\

' w f. f\\

m 81062gg Q y5 l

" [

• n McGUIRE NUCLEAR STATION INCIDENT REPORT 4

REPORT NUMBER: 81-59 3

REPORT DATE: May 8, 1981 OCCURRENCE DATE:-April 18, 1981 FACILITY: McGuire Unit 1, Cornelius, N.C.

IDENTIFICATION OF OCCURRENCE: The flow rate measuring device,or the j

Conventional Waste (WC) water treatment line was declared inoperable.

CONDITION PRIOR TO OCCURRENCE: On April 14, 1981 at 1934 hours0.0224 days <br />0.537 hours <br />0.0032 weeks <br />7.35887e-4 months <br />, water from the settling pond was being released when it was noticed that the WC dis-charge flow meter's strip chart recorder was not functioning properly.

The digital read out of the meter did not correspond with its chart recorder.

This was reported to the Shif t Supervisor who incurn declared the instrument inoperable. This was a reportable incident pursuant to Technical Spec-ification 3.3.3.8.

l APPARENT CAUSE OF OCCURFENCE: The flow rate measuring device (Model 1870 Flow Meter) had been set-up to read and record the level of the flow stream during discharge. This was done by adjusting and changing several control switches on the flow meter to dif ferent settings. The MODE rotary switch which selects the mode of operation was moved to the FLOW RATE position at device number 4 instead of being at the LE'FZL position. This caused the.

strip chart recorder to give wrong indications.

ANALYSIS OF OCCURRENCE: On April 18, 1981 at 1120 hours0.013 days <br />0.311 hours <br />0.00185 weeks <br />4.2616e-4 months <br />, a release had just been initiated from the WC settling pond when it was noticed that the flow meter's strip -chart recorder was not recordin6 the correct flow rate.

The flow meter's digital readout indicated a level equivalant to 457 gpm but'the chart recorder did not correspond. At that time, Chemistry personnel were nat sure if the instrument was considered inoperable since its digital readout was functioning properly. At 1320 hours0.0153 days <br />0.367 hours <br />0.00218 weeks <br />5.0226e-4 months <br /> (two hours later), another reading was recorded at 457 spm. This time, the Shift Supervisor was

notified of the problem and he declared the instrument inoperable (1324 hours0.0153 days <br />0.368 hours <br />0.00219 weeks <br />5.03782e-4 months <br />).

It was found that the MODE rotary switch was placed in the FLOW RATE, DEVICE NO. 4 position. The instrument cabinet was provided with a pad lock to prevent access by non authorized personnel. However, when the ISCO Composite saepler was installed (4/13/81 to 4/15/81), it is believed that the MODU select switch may have been moved to that position because the cabinet had to be opened to install the sampler. The flow meter's MODE select switch was put back to the LEVEL position and the instrument was checked and calibrated for proper operation. The strip j

chart recorder was also verified to be functioning properly. The flow meter was declared operable at 1545 hours0.0179 days <br />0.429 hours <br />0.00255 weeks <br />5.878725e-4 months <br /> on that same day.

May 18, 1981 Page 2

SAFETY ANALYSIS

The health and safety of the public were not affected by this incident because the flow meter was back in service within 2 1/2 hours. Action Statement 31 of Technical Specification 3.3.3.8. requires flow rate be estimated at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> during actual releases and this may continue for up to 30 days. Moreover, since there is only new fuel in the core, there should be no radioactive effluent releases through the WC system.

CORRECTIVE ACTION

Flow was estimated three times during the actual release when the flow meter was inoperable. The flow meter's MODE select switch was repositioned to the proper (LEVEL) position. The instrument was tested and calibrated for proper operation and was declared operable at-1545 hours on April 18, 1981.

1