ML20006C399
| ML20006C399 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 01/19/1990 |
| From: | Scarano R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | |
| Shared Package | |
| ML20006C393 | List: |
| References | |
| 50-344-89-30, NUDOCS 9002070447 | |
| Download: ML20006C399 (4) | |
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APPENDIX B NOTICE OF DEVIATION Portland General Electric Company Docket No. 50-344 TrojanNuclearGeneratingPlant License No. NPF-1 As a result of the inspection conducted during the period of December 18 through22, identified.a deviation of your commitment in the Final Safety Analysis 1989 Report was In accordance with the " General Statement of Policy and Procedures for NRC Enforcement Actions," 10 CFR Part 2, Appendix C (1989),
the deviation is listed below:
j A.
Trojan Final Safety Analysis Report, paragraph 11.5.2.2, Continuous Gas Monitoring Systems, provides that sampling devices and procedures 1
reflect the recommendations of ANSI N13.1-1969 Guide to Sampling Airborne Radioactive Material in Nuclear Facilities.
ANSI N13.1-1969, Appendix A, Guides for Sampling from Ducts and Stacks, reads, in part:
J The point at which a duct or stack should be entered for sampling should be selected after taking into account several factors.
In i
the region immediately downstream from bends or severe transitions, flow patterns may be markedly distorted.
These locations should be avoided.... Generally, the distance from the transition or elbow to l
the point of sampling should be a minimum of five and preferably ten or more diameters downstream....It is recommended that the velocity distribution be measured at the anticipated section to determine that flow is fully developed and mixing complete....For laminar flow (Re < 2100) in circular ducts the flow profile is a parabolic distVibution of velocities...The average velocity occurs at about
.l 0.7 the radial distance from the axis of the duct to the wall. A sample drawn from this point through the inlet of the probe at a velocity equal to the average velocity in the duct will furnish a valid sample...At greater velocities and flows, turbulent flow will likely exist....
Contrary to the above, the physicial configuration of Temporary Modification (TM)89-072; installed to the PRM-1 sampling system on July 13, 1989-did not meet the criteria, as specified in ANSI N13.1-1969, for isokineticsamplingoftheHydrogenVentSystem(HVS)effluentduring containment pressure reductions in that the sample line was not positioned in the HVS duct but in front of the HVS nozzle penetration into the pur e duct, providing a radical flow transition; the sample line t
L was not rigi ly fixed in position allowing it to be moved about by the air flow; an the sample line was secured by stay-ties and tape which would be expected to further disturb the air flow.
This is a deviation.
Please provide to the U.S. Nuclear Regulatory Commission, ATTN:
Document Control Desk, Washington, DC 20555, with a copy to the Regional Administrator, gg20fggg{gggy44 }
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"O Region V, and a copy to the NRC Resident Inspector, Trojan in writing within 30 days of the date of this Notice the reason for the deviation, the l
correctivestepsthathavebeentakentoavoidfurtherdeviations,theresults achieved, and the date when your corrective action will be complete.
Please inform us if you are unable to respond within 30 days.
l FOR THE NUCLEAR REGULAT Y COMMISSION
- = >/W Ross A. Scarano Director DivisionofRadIationSafety
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and Safeguards i
Dated this / g dalnut Creek, California dayofg/g
, 1990 l
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f APPENDIX B NOTICE OF DEVIATION Portland General Electric Company Docket No. 50-344 TrojanNuclearGeneratingPlant License No. NPF-1 i
i As a result of the inspection conducted during the period of December 18 i
through22, identified.a deviation of your commitment in the Fic.a1 Safety Analysis 1989 Report was In accordance with the " General Statement of Policy and Procedures for NRC Enforcement Actions," 10 CFR Part 2, Appendix C (1989),
the deviation is listed below:
A.
Trojan Final Safety Analysis Report, paragraph 11.5.2.2, continuous Gas Monitoring Systems, provides that sampling devices and procedures reflect the recommendations of ANSI N13.1-1969 Guide to Sampling i
Airborne Radioactive Material in Nuclear Faci 1Ittes.
ANSI N13.1-1969, Appendix A, Guides for Samplina from Ducts and Stacks, reads, in part:
The point at which a duct or stack should be entered for sampling should be selected after taking into account several factors.
In the region immediately downstream from bends or severe transitions, flow patterns may be markedly distorted.
These locations should be avoided.... Generally, the distance from the transition or elbow to the point of sampling should be a minimum of five and preferably ten or more diameters downstream....It is recommended that the velocity distribution be measured at the anticipated section to determine that flow is fully developed and mixing complete....For laminar flow (Re < 2100) in circular ducts the flow profile is a parabolic distribution of velocities...The average velocity occurs at about 0.7 the radial distance from the axis of the duct to the wall.
A sample drawn from this point through the inlet of the probe at a velocity equal to the average velocity in the duct will furnish a valid sample...At greater velocities and flows, turbulent flow will likely exist....
Contrary to the above, the physicial configuration of Temporary Modification (TM)89-072; installed to the PRM-1 sampling system on July 13, 1989-did not meet the criteria, as specified in ANSI N13.1-1969, for isokinetic sampling of the Hydrogen Vent System (HVS) effluent during containment pressure reductions in that the sample line was not positioned in the HVS duct but in front of the HVS nozzle penetration into the pur e duct, providing a radical flow transition; the sample line was not rigi ly fixed in position allowing it to be moved about by the air flow; an the sample line was secured by stay-ties and tape which would be expected to further disturb the air flow.
This is a deviation.
Please provide to the U.S. Nuclear Regulatory Commission, ATTN:
Document Control Desk, Washington, DC 20555, with a copy to the Regional Administrator,
j j
Region V, and a copy to the NRC Resident Inspector, Trojan in writing within
)
30daysofthedateofthisNotice;thereasonforthedevIation,the
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corrective steps that have been taken to avoid further deviations, the results achieved, and the date when your corrective action will be complete.
Please infore us if you are unable to respond within 30 days.
FOR THE NUCLEAR REG TORY COMMISSION N
Ross A. Scarano Director DivisionofRadlationSafety and Safeguards l
Dated ainut Creek, California this day of g 1990 t
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