05000263/LER-1995-001, :on 950206,missed Grab Sample on SW Radiation While Maint Was Being Performed on Sample Pump.Caused by No Administrative Aids to Ensure That Shift Took Required Samples.Took Sample Immediately
| ML20080K609 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 02/22/1995 |
| From: | Hill W, Parker T NORTHERN STATES POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LER-95-001, LER-95-1, NUDOCS 9503010189 | |
| Download: ML20080K609 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2) 10 CFR 50.73(e)(2) 10 CFR 50.73(a)(2)(i) |
| 2631995001R00 - NRC Website | |
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Northem States Power Company Monticello Nuclear Generating Plant 2807 West Hww 75 Monticello, Minnesota 55362-9637 l
February 22,1995 Report Required by 10 CFR Part 50, Section 50.73 i
l U.S. Nuclear Regulatory Commission Attn: Document Cor: trol Desk Washington, DC 20t 55
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MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 LER 95-001 Missed Grab Sample on the Service Water Radiation When Maintenance was Beina Performed on the Sample Pump The Licensee Event Report for this occurrence is attached. This report contains the following new NRC commitment:
Chemistry Procedures will require that administrative sids be used to ensure that samples required for Technical Specification equipment which is not in service is performed by the shift chemist. (Commitment Number: M95 003A)
Please contact Tom Parker at (612) 295-1014 if you require further information.
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W J Hill Plant Manager 1
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Regional Administrator - til NRC Sr Resident inspector, NRC NRR Project Manager, NRC l
State of Minnesota, Attn: Kris Sanda Attachment i
9503010189 950222 PDR ADOCK 05000263 S
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Nhc FORM 366 U.S. NUCLEAR REGULATOaY COMMISSION APPROVED BY OM2 N;3. 3150 0104 85
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EXPIRES 5/31/95 ESTIMATED BURDEN PER RESPONSE TO COMPLY WffH THIS LICENSEE EVENT REPORT (LER)
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MANAGEMENT AND SUDGET.WA&HINGTON, DC 20603.
F AC4LfiY NAME (1)
DOCKET NUMBER Q)
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MONTICELLO NUCLEAR GENERATING PLANT 05000 - 26 3
(" 5 wtE m Missed Grab Sample on the Service Water Radiation When Maintenance was Being Performed on the Sample Pum)
EVENT DATE (8)
LER NUMBER (6)
REPORT NUMSER (7)
OTHER FACILITIES INVOLVED (5)
MONTH DAY YEAR YEAR MONTH DAY YEAR 05000
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02 06 95 95 001 00 02 22 95
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OPERATIP8G N
THIS REPORT IS SUSMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR 4: (Check one or more) (11)
MODE (9) 20.402(b) 20.406(c) so.73(a)g)(iv) n 71(b)
POWER 100 20.es(e)(1)p) n.3s(c)(1) so.73(e)(2)(v) n rice)
LEVEL (10) of, 20.406(e)(1)01) so.3s(c)(2) so.73(a)(2)(v61)
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So.73(e)(2)(iii)
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Fa= m LICENSEE CONTACT FOR THIS LER (12)
NAME TELEPHONE NUhSER (6nclude Area Code)
Tom Parker 612-295-1014 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)
CAUSE
SYSTEM COMPONLN1 MANUF ACTURER RE ABLE
CAUSE
$YSTEM COMPONENT MANUF AC1URER RE E
SUPPLEMENTAL REPORT EXPECTED (14)
EXPECTED M NN DAY YW hrs cwer EXPECTED SUDMISSION DATE)
DATE ABSTRACT LMn TO 1400 SPACES. l E., APPROXMATELY 15 SINGLE-SPACED TYPEWRfTTEN UNES) (16)
NCR FORM 386 (541)
The shift chemist did not take a grab sample as required by Technical Specification Table 3.8.1 when the Service Water Discharge Pipe Gross Radioactivity Monitor was removed from service.
Two Preventative Maintenance Procedures were scheduled for the day shift, February 6,1995: the ennual Service Water Radiation Monitor Pump replacement and the quarterly Service Water Radiation Monitor strainer cleaning. Operations personnel removed the monitor from service at 0530 in preparation for the maintenance work. A grab sample was then required by 1330. This sample was not taken until 1503. Administrative changes have been made to assure that samples that are required on Technical Specification equipment removed from service are taken as required.
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MONTICELLO NUCLEAR GENERATING 05000 95 001 00 2 of 5 PLANT 263 TEXT (r more apese a sueused, amo essmanse sepas of AMC Fonn.1984 (17)
Description
While operating at 100% power, maintenance was planned to be performed on the Service Water Discharge Pipe Gross Radioactivity Monitor (Ells System Code: IL)(Ells Component Code: RI). Two Preventative Maintenance (PMs) procedures were '
scheduled to be performed on the day shift, February 6,1995: the annual Service Water Radiation Monitor Pump (Ells Component Code: P) replacement (PM 4123) and the quarterly Service Water Radiation Monitor Strainer (Ells Component Code: STR) cleaning (PM 4235). Operations personnel removed the monitor from service at 0503 on February 6,1995 in preparation for the maintenance work.
1 Technical Specification 3.8.A.1.c requires effluents be monitored in accordance with i
Table 3.8.1, Radioactive Liquid Effluent Monitoring Instrumentation. This table requires i
8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> grab samples be taken when the Service Water Discharge Pipe Gross l
Radioactivity Monitor is removed from service.
Operations personnel notified the shift chemist at 0530 that the monitor was out of service and grab samples were required every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. This information was passed to the day shift chemist at the shift turnover. The control room operators and the day shift chemist discussed the grab sample around 0800 when the shift chemist made their rounds through the control room. The shift chemist indicated that the sample would be taken later if the monitor was not back in service within the 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
At 1500 the control room operator contacted the chemist to verify the sample had been taken and learned that it had not been taken.
Cause
There were no administrative aids to ensure that the shift chemist took the required samples.
Analysis This event is reportable per 10 CFR Part 50, Section 50.73(a)(2)(i) since a Technical Specification required test was not performed within the specified time.
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MONTICELLO NUCLEAR GENERATING 05000 95 001 00 3 of 5 PLANT 263 TEAT (rmcre space a rogurust, use ockistenaf copea of NRC Fcrm 366N (17)
The Service Water Discharge Pipe Gross Radioactivity Monitor measures the radioactivi s of the service water after it has passed through various heat exchangers I
and before it is mixed with the Circulating Water (See Figure). This mixed water is sent to the Discharge Canal (after being sent to the Cooling Towers if they had been in service). The Discharge Canal water is continuously monitored by two other radiation monitors (the Discharge Canal Gross Radioactivity Monitors), which were in service.
These monitors use one of two sample pumps to continuously send water through a radiation monitor and also periodically discharges a sample to a collection tank that is analyzed weekly (called the composite sample). Both the continuous monitors and the composite sample confirmed that no radiological releases occurred during the 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> that the monitor was out of service.
There were no consequences from missing this Service Water grab sample since no radiological releases were made and the water was continuously monitored by the Discharge Canal Gross Radioactivity Monitors.
The sample was taken upon discovery of the error, indicating only naturally occurring radioactivity.
Corrective Actions
1.
The sample was immediately taken following discovery of the error.
2.
The shift chemist's office white board has been modified to provide a designated area for sample times for Technical Specification equipment which is not in service. Procedures have been modified to require the shift chemist to write on the white board the time that future samples will be required to be taken.
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Failed Comoonent identification i
None
Previous Similar Events
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LER 87-024: False Assumption of Test Completion Causes Missed Sampling for an l
Inoperative Process Monitor.
i The event involved the missing of the grab sample on the Service Water Discharge Gross Radioactivity Monitor also. However, the reasons for missing the sample in 1987 were associated with a misunderstanding between the Operations Group and the personnel doing the sampling. Therefore, the corrective actions could not have prevented this event.
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