IR 05000237/1986014
| ML17199F797 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/05/1986 |
| From: | Holtzman R, Oestmann M, Schumacher M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML17199F796 | List: |
| References | |
| 50-237-86-14, 50-249-86-16, NUDOCS 8606160081 | |
| Download: ML17199F797 (14) | |
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U.S. NUCLEAR REGULATORY COMMISSION
REGION III
Reports No. 50-237/86014(DRSS); 50-249/86016(DRSS)
Docket Nos. 50-237; 50-249 Licenses No. DPR-19; DPR-25 Licensee:
Commonwealth Edison Company Post Office Box 767 Chicago, IL 60690 Facility Name:
Dresden Nuclear Power Station, Units 2 and 3 Inspection At:
Dresden Site, Morris, IL Inspection Conducted:
May 8, 12-15, and 19-20, 1986
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Inspectors:
M. J. Oestmann R_,~,~
R. B. Holtzman 7#~~
Approved By:
M. C. Schumacher, Chief Radiological Effluents and Chemistry Section Inspection Summary Date Date Inspection on May 8, 12-15, and 19-20, 1986 (Reports No. 50-237/86014(DRSS);
No. 50-249/86016(DRSS))
Areas Inspected:
Routine, unannounced inspection of (1) chemistry/radiochem-istry program, including water chemistry control, procedures, and practices, facilities and equipment, management controls, training and qualifications, licensee internal audits, quality assurance and quality control; (2) review of actions taken regarding previous violations and open item Results:
No violations or deviations were identifie foOOBT-860609- - ---
PDR ADOCK 05000237 Q
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DETAILS Persons Contacted 1D. Scott, Station Manager, Dresden 1J. Brunner, Assistant Superintendent, Technical Services, Dresden 1 D. Adam, Regulatory Assurance, Dresden W. Ahrens, QA Inspector, Dresden 1 R. Jeisy, Station QA Supervisor, Dresden 1S. McDonald, Radiation Chemistry Supervisor, Dresden 1 ' 2W. Johnson, Lead Chemist, Dresden 1 ' 3J. Knoll, Laboratory Chemist, Dresden 1 E. 0 1Connor, Assistant to Radiation Chemistry Supervisor, Dresden T. Schneider, Chemist, Dresden R. Arnoldi, Engineering Assistant, Dresden K. Neal, Chemical Engineer, Auxiliary Systems, Dresden K. Whittum, Chemist, Dresden D. Marco, Chemist, Dresden J. Reuttiger, Laboratory Foreman, Dresden B. Zank, Training Supervisor, Dresden R. Burns, Training Instructor, Dresden M. Burgess, Chemist, Technical Center, CECo US NRC 1 L. McGregor, NRC Senior Resident Inspector 1E. Hare, NRC Resident Inspector The inspector also interviewed several other licensee personnel during the course of the inspection, including chemistry and health physics per$onne Denotes those present at the plant exit interview on May 15, 198 Denotes those present during telephone conversation on May 19, 198 Denotes those present during telephone conversation on May 20, 198.
Licensee Action on Previous Inspection Findings (Closed) Violation Severity Level V (No. 50-010/86002-01; No. 50-237/86002-01; No. 50-249/86002-01):
Licensee failed to maintain radiation control procedures in accordance with TIS Section 6. The licensee performed an audit of Dresden Chemical Procedure Books No. 35 and 35A on February 6, 1986, to ensure that proper revisions to all procedures were presen During this inspection, the inspector confirmed that four DCP Manuals, including Books 35 and 35A, contained the proper revisions to the controlled chemistry procedure This item is closed.
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- (Closed) Open Item (No. 50-010/86002-02; No. 50-237/86002-02; No. 50-249/86002-02):
Examine licensee plotting QC performance dat The inspector confirmed that the licensee plotted performance checks for counting gamma, beta and alpha check sources on control charts prior to April 1, 1986 in response to audit finding The licensee also is plotting laboratory analytical results of bias (blind) samples and precision samples containing key chemical parameters on control charts to improve QC of laboratory performanc Further discussion is given in Section This item is close (Closed) Open Item (No. 50-010/86002-03; No. 50-237/86002-03; No. 50-249/86002-03):
Examine adequacy of the licensee's response to QA related findings and observations of audits QAA-12-86-02 and 12-85-I The inspector reviewed the corrective actions to the findings and observations of these two audits and found adequate actions taken such that both audits were closed out on February 24, 198 In particular the licensee prepared a procedure DCP 1900-1, 11 Instrument Out-of-Tolerance Corrective Action Policy, 11 Revision 0, dated February 1986, in response to Finding No. 2 of the offsite audit 12-85-I The licensee is currently implementing this procedure whenever require This item is close (Open) Open Item (No. 50-010/86002-04; N /86002-04~
No. 50-249/86002-04):
Examine implementation of an extended QA/QC program for testing RCT performanc Every six months the chemistry management tests RCT proficiency in accordance with Procedure DCP 1900-7 11 Radiation Chemistry Technician Semiannual Proficiency Check, 11 Revision 0 April 198 Each RCT is given one of three groups of unknowns at the beginning of his tour in the laborator The RCTs are given unknown samples to analyze for chloride, pH, silica and conductivit Iron, copper, and total organic carbon will be added to the list within the next mont This program was begun in August 1985 and resu"lts for 1986 showed that 11% of the 13 RCTs performing analysis were outside the 10% acceptance range, See Section 7 for further discussio This item will remain open, pending full implementation of this program for all RCT (Open) Open Item (No. 50-010/86002-05; No. 50-237/86002-05; No. 50-249/86002-05):
The licensee will count a fuel pool sample for gross beta, tritium, strontium-89 and 90 and report results to Region II Table II lists the comparison results showing disagreements for gross beta and strontium-89 and no comparison for strontium-9 The licensee investigated but failed to identify the reasons for the disagreement A spiked sample containing strontium-89 and 90 will be sent to the licensee from the NRC Reference Laboratory to retest the licensee's capability in analyzing for these radionuclide This item will remain open, pending licensee obtaining satisfactory results of the spiked sample.
- (Closed) Open Item (No. 50-237/86003-01; No. 50-249/86004-01):
Licensee to issue errata to the 1984 Annual Operating Report to correct non-routine reporting levels in the 1985 annual operating repor The licensee corrected the non-routine reporting levels in errata to the 1984 annual report issued in the 1985 annual repor This item is close.
Management Controls, Organization, Training and Qualifications The inspector reviewed the organization and staffing of the Chemistry Grou The Lead Chemist, who reports to the Radiation-Chemistry Supervisor, oversees the chemistry/radiochemistry are Four chemists, a Radiochemist, a Chemical Engineer for Auxiliary Systems (HRSS) and an engineering assistant report to the Lead Chemist and supervise specific area One of the Chemists is the Station Chemistry Control Coordinator (SCCC) responsible for overseeing the Station Chemical Control Program discussed in Section Another chemist is assigned to oversee laboratory functions and is responsible for the QC progra The chemists all have bachelors degrees in chemistry, but, except for the Radiochemist, have limited experience, having been assigned to their positions only within the last two to three year The Lead Chemist has been in this position for about a year and a hal The inspector 1 s discussions with him and a review of his background indicated that this individual meets the ANSI/ANS-3.1-1978 requirements for this positio The Laboratory Foreman, who also reports to the Lead Chemist, provides work assignments to the Radiation/Chemistry Technicians (RCTs) and supervises laboratory activitie The 51 RCTs are assigned on a rotating basis to three weeks in chemistry followed by sixteen to twenty-six weeks in health physic Because of the lengthy interval between assignments to the Chemistry Group, the Chemists and Laboratory Foreman are required to provide close supervision of the RCTs to assure credible analytical results are obtaine The Chemistry staff also presents a training program involving up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> µer week supervisory tim The program includes providing semiannual proficiency samples to the RCT prior to his performing any analysi The RCT must obtain satisfactory results in these samples before he performs any analysi Fifteen RCTs from the pool of 51 completed their generic training at the Braidwood Production Training Center a year ago and are in the process of completing their two-year certification program by completing their qualification (OJT)
card The remainder who have been at the Dresden Station for ten to twenty years received a three week course from Nuclear Utilities Services, Inc., in 1985 to upgrade their level of trainin The licensee also presents a one week site-specific training program each quarter to the experienced RCT Normally two days out of the week are devoted to lectures and OTJ training on chemistry topic The inspector 1 s observation of difficulties encountered by an RCT performing silica analysis on reactor water (Section 8) indicated a possible problem with training effectivenes The RCT, who had not been assigned to the laboratory for six months, required assistance by the Laboratory Foreman and the analyses had to be repeated three to four
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times before an acceptable result was obtaine The long period of absence from the laboratory results in a loss of laboratory proficienc The licensee is attempting to minimize this problem by restricting the absence to about three week A licensee representative reported that the licensee has under consideration permanently assigning each RCT to either the Chemistry or Health Physics Grou As yet no decision has been mad The effectiveness of training for RCTs will be reviewed in a subsequent inspectio (Open Item No. 50-237/86014-01; No. 50-249/86016-01).
No violations or deviations were identifie.
Water Chemistry Control Program The inspector reviewed the licensee 1s BWR Water Chemistry Control Program (Nuclear Stations Division Directive [NSD0-517] issued on October 5, 1984).
This program is consistent with the BWR Owners Group Guidelines and adequately addresses management policies, assignments of authority and responsibilities to implement the program, and provides appropriate guidance on operational chemistry limits designed to minimize stress corrosion cracking (IGSCC) in the reactor system and turbine An analytical measurements program, performance monitoring of the program data management and trending, and training requirements are include Management responsibilities described in the directive include providing adequate resources of staff, equipment, funds and organization to implement the program to avoid IGSCC of the reactor syste Action levels are to be implemented whenever an off-normal value is detecte The inspector confirmed that the station is implementing this directive through Procedure DCP 1200-5, 11 Reporting Conditions for Selected Laboratory Analyses Schedule of Limitations, 11 Revision 7, approved by the Uresden Ons1te Review Buctn1 (DOSR) in Fcbruu.ry 198 This licPnsPP hris established action levels for off-normal conditions and satisfactorily plots trends of key chemical parameters during plant operatio The inspector determined that the licensee has been implementing this program since June 198 The inspector reviewed trend plots of key chemical parameters for different plant systems starting in January 1986 and noted adequate explanations were given when a specific key chemical parameter was found in excess of the normal valu On these occasions, the licensee resampled the particular system and performed an investiga-tion of the cause of the off-normal value to correct the situatio For example during the week of April 27 to May 3, 1986, the conductivity of the 11c 11 Reactor Coolant Cleanup Demineralizer Effluent was reading 0.11 µ S/cm which was in excess of the limit level of< 0.08 µ S/cm in one sample out of five analyze An investigation indTcated that the demineralizer bed was being depleted and needed replacemen Other examples were given that showed timely actions were taken in response to off normal result It appears that the licensee is implementing an effective water chemistry control progra No violations or deviations were identifie * Station Chemical Control* Program The inspector reviewed the licensee's program to restrict and control the use of chemicals throughout the plant to maintain system integrit The program is outlined in DAP 16-1 11Station Chemical Control Program, 11 Revision. 2, approved by DOSR on June 2, 198 This procedure established policy on chemical usage, the position of Station Chemical Control Coordinator (SCCC) to oversee the program, and classifies chemical products for the protection of the plan The inspector discussed this program with the SCCC who appeared to be knowledgeable about different chemicals, and who has developed a strict program for plant usage and testing chemical Inspector's review of the program indicated it is effectively being implemente No violations or deviations were identifie.
Implementation of the Chemistry/Radiochemistry Program The inspector reviewed the chemistry/radiochemistry program including the physical facilities, laboratory operations, chemistry procedures and practices followed in the hot and cold laboratories and counting room Laboratory space, including fume hood space in both the hot and cold laboratories appeared crowde The licensee plans to remodel the space starting in July 1986 and remove excess hoods and provide for additional laboratory bench spac The total laboratory space will, however, remain the sam Ventilation in the laboratories and hoods was adequat The hoods are checked daily to assure that adequate ventilation is available during chemistry operation Housekeeping in the laboratories was goo The licensee has a Perkin-Elmer Model 5000 atomic absorption spectrophotometer, two DI unex 2020 i ion chromatograph:::;, pH.:ind cpocifi c ion probi:ic;,
conductivity meters and twu total organic carbon ap.:ilyzcr Review of log sheets for the analyses ind'itated no problem The laboratory is currently using a specific ion probe for chloride and fluoride analysis rather than an ion chromatograph (IC) which they are presently developing for such purpose The licensee uses a gas chromatograph (GC) unit at another licensee operating plant when neede The licensee representative said that insufficient laboratory bench space is available to place a GC uni The instruments were found to be operable, well maintained, and calibrated with current calibration sticker Chemical balances are calibrated every six months by a vendo Reagent bottles were found to be properly labele No solutions or chemicals were found to have passed their posted expiration date The counti.ng rooms have radiochemistry equipment of high qualit In the 11Spec 11 rooms, each of five shielded Ge(Li) and Ge detectors was controlled by one of the two Ortec multichannel analyzers and their associated PDP 11/44 computer A Packard liquid scintillation counter also was availabl A second counting room has three Tennelec and one Canberra alpha-beta multi-sample proportional counter All counting equipment was found operational and well maintaine *
Selected Chemistry Procedures (DCPs) for various analyses and surveil-lances (listed below) were being implemente They had been approved by the DOSR Board during 1985 and 198 No technical problems were noted during a review of the following procedure DCP 1100-3 DCP 1100-4 DCP 1100-9 DCP 1100-11 DCP 1100-24 DCP 1100-34 DCP 1100-44 DCP 1100-46 DCP 1100-61 DCP 1300-17 DCP 1700-2 DCP 1700-6 DCP 1900-4 Low Range Boron High Range Boron Dissolved Oxygen Analysis Colorimetric Method Suspended Solid Test on Water Samples Silica Determination Total Organic Carbon Analysis of Aqueous Samples Using the Dohrman DC-80 Determination of Feedwater Metals Using the Atomic Absorption Spectrophotometer Low Range Chloride with a Specific Ion Electrode Calibration of Laboratory Balances Calibration of the Radiometer Conductivity Meter Makeup Demineralizer pH Records Accuracy Check Conductivity Meter (Solu-Meter) Calibration Check Criteria and Testing of Chemicals and Chemical Products for Approved Plant Use Review of selected log sheets indicate that the licensee has been analyzing for sodium nitrite in closed cooling water using the ion chromatograph, conductivity, chloride and silca in reactor coolant water and 11C 11 cleanup demineralizer effluent, dissolved oxygen in feedwater, conductivity of condensate demineralizer and storage tank water, and conductivity and silica in the fuel pool and other key chemical parameter No problems were identifie The inspector observed several RCTs performing different analyse Certain RCTs appeared knowledgeable regarding procedures and laboratory practices but others seem to lack experience and needed closer supervision by the Laboratory Forema Discussions with chemistry personnel indicated that closer supervision was needed when there was a longer absence of the RCT from the laborator This was noticeable when a RCT had to repeat several analyses (Section 8) for silica in reactor coolant.
No violations or deviations were identifie * Implementation of the QA/QC Program in Chemistry/Radiochemistry Laboratory The inspector reviewed the Chemistry/Radiochemistry QA/QC program described in the following DCP procedures:
DCP 1900-1 DCP 1900-2 DCP 1900-3 DCP 1900-7 DCP 1900-8 Instrumentation out-of-tolerance Corrective Action Policy Revision 0, February 1986 Quality Control Program for Chemistry Instrumentation Revision 2, May 1986 Verification of Chemistry Analytical Performance Revision 1, April 1986 RCT Semiannual Proficiency Check Revision 0, April 1986 Analysis of Quality Control Samples in the Chemistry Laboratory, Revision 0, April 1986 Procedure DCP 1900-2 was revised to require the plotting of performance check data to trend counting equipment performance in response to a finding in a licensee audi The inspector reviewed several log sheets discussed in DCP 1900-2, including performance checks recorded on DCP 3000-T36A 11Quality Control Checks for the Conductivity Ce 11 11 as part of DCP 1900-2 and found a 11 appropriate information was recorde No problems were identifie The licensee in accordance with DCP 1900-3 maintains control charts of QC samples including bias (blind) and precision (duplicate) samples analyzed by the RCTs each week during the analysis of routine samples, in the hot and cold laboratorie The Glind samples obtained from the IJSEPA and Environmental Resource Associates contain high and low conductivity, chloride, nitrites, pH, turbidity, hardness, alkalinity, total suspended solids, total organic carbon, silica, iron, copper, nickel and chromiu This program started in January 1986 and will not be fully implemented until the fall of 198 The licensee is presently using +/-15% of the accuracy of the acceptable values until 40 or more points are accumulated to develop the control char Then the licensee plans to reduce this to
+/-10% to tighten the control Preliminary results indicate that good data have been obtained for nitrite analysis done on the ion chromatograph and p Full implementation of other results were at the beginning stag This QC program will be reviewed in a subsequent inspectio (Open Item No. 50-237/86014-02; No. 50-249/86016-02)
As discussed in Section 2d. the chemistry management provides proficiency (unknown) samples to the RCT on a semiannual schedul This program started in August 1985 and results for 1986 to date show that about six (11%) of the 54 analyses performed by about 13 RCTs were outside the +/-10%
acceptance rang This is an improvement over the 1985 results which showed 35% of the analyses performed by 15 RCTs were outside the 10%
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acceptance rang The unacceptable results were mainly silica and chlorid This item will continue to be reviewe (Open Item No. 50-010/86002-04; No. 50-237/86002-04; No. 50-249/86002-04)_
Iron, copper and total organic will be added to the list for the RCTs to analyz Procedure DCP 1900-8 discusses the analysis of bias and prec1s1on samples on a weekly basi As discussed above, the bias samples are plotted on control charts and kept in the QC log boo Similarly, precision data where analyses are duplicated are also plotted on control chart The precision sample may be the bias sample, standard, or a plant sampl The inspector observed several RCTs perform duplicated analyses of different samples and results appeared satisfactor The inspector also noted that each time a specific analyses such as silica, chloride, conductivity, pH or other analyses were performed the RCTs also ran a standard sample to check out the reliability of that particular analysi For example, each day the RCT ran a standard curve for the specific ion probe using five different standard chloride sample This is a good practice to assure the analytical procedure and equipment are working properl In 1986 the licensee initiated quarterly interlaboratory crosscheck pilot program through the licensee's Technical Cente The pilot program included distribution of non radiological chemical solutions containing key parameters to each of the licensee's operating plant They included chloride, fluoride, sulfate, iron, copper, nickel, chromium, and silic Dresden's results were within one standard deviation of the Technical Center's measured and calculated known concentration The next quarterly sample will be distributed in June 1986 and interlaboratory comparisons will be performe Results will be reviewed in a subsequent inspectio (Open Item No. 50-237/86014-03; No. 50-249/86016-03).
The licensee has made commendable efforts during the past year to improve laboratory performanc These efforts show an increased appreciation of the importance of QA/QC programs in achieving valid analytical result No violations or deviations were identifie Water Sampling, Monitoring and Processing The inspector reviewed the water treatment, sampling and monitoring programs and observed related equipment during a station tou The licensee has adequate sampling capabilities for the Reactor Coolant and cleanup demineralizer system, the condensate storage pump discharge, condensate storage tank and radwaste system to perform the necessary chemistry functions for the statio No problems were noted when a RCT was observed collecting reactor coolant and a cleanup demineralizer effluent in the Reactor Coolant Sample Pane The RCT seemed knowledgea-ble about what was expected of him, used appropriate handling techniques for radioactive samples, and adequately measured the conductivity of the water using a calibrated flow cell and solu-mete However, he ran into
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difficulty in analyzing for silica, having to repeat the analysis three to four times before the Laboratory Foreman came to his assistance, but had no trouble analyzing for pH, chloride, fluoride, and turbidit A licensee representative also discussed the need to improve on-line monitor The licensee has a conductivity on-line monitor readout in the Control Room that monitors reactor coolant and cleanup demineralizer effluen On-line monitors for specific conductivity, pH, and dissolved oxygen in the station, however, were not functionin The licensee plans to upgrade the on-line monitors during the first half of 1987 in accordance with recommendations of a corporate BWR Working Group task forc Vendors will be used to improve process sampling and monitoring equipment to add sodium, silica and dissolved oxygen monitors besides the existing conductivity and pH monitor This item will be reviewed in a future inspectio (Open Item No. 50-237/86014-04; No. 50-249/86016-04).
Overall, work is needed to improve the water processing and monitoring of the various plant systems to bring the station up to par with other newer station The licensee is aware of this need and plans to implement improvements in early 198 No violations or deviations were identifie Station Modifications Affecting Water Quality Control The inspector reviewed the following station modifications the licensee plans to make in 1987 to comply with the corporate BWR Water Quality Control Directiv Install sodium analyzers in the hotwell in order to confirm tube leaks and reduce the time necessary to locate the leak; Modify the exi st1 ng regem:!r*aVi on equipment in the condensate system in order to prevent excess resin waste during a major condenser leak; Upgrade the sampling and analysis equipment to include process conductivity and dissolved oxygen in order to improve sensitivity of measurement and to efficiently operate water treatment equipment; Increase cooling capabilities of sample stations in order to be able to measure conductivity at 25°C rather than correct the conductivity at the present elevated temperatures; Install resin sampling systems in the condensate demineralizer systems to obtain representative resin samples; Perform an investigation on dissolved oxygen and carbonate levels at the condensate pump discharge before, during, and after makeup to determine the effectiveness of the condenser as a deaerato Install makeup water degassifiers to lower the amount of C02 and, thereby, conductivity in the makeup wate *
1 Provide a separate dedicated cleanup system to process suppression pool water in order to keep the water clean at all times and decrease the time for startu Investigate installation of automatic valves for long path feedwater flushing in order to reduce startup time and crud buildu These changes will be examined in a subsequent inspection (Open Item Nb. 50-237/86014-06; No. 50-249/86016-06).
The inspector also discussed the reactor pipe replacement program with licensee representative A number of metallurgical samples taken from the old recirculating pipe will be examined for evidence of stress corrosion crackin The licensee agreed that close chemistry control is essential to minimize any corrosion, particularly in the new pipe recently installe The licensee recognized that close cooperation between the Chemistry and Operating Group is essential to protect the plant integrity over the life time of the plan No violations or deviations were identifie Licensee Internal Audits The inspector reviewed three audits and one surveillance relating to Chemistry:
QAA 12-85-15, March 1985, QAA 12-86-02, January 1986 performed by onsite personnel and Audit 12-85-II, October 1985 by offsite personnel; and QAS-12-86-004, January 198 The inspector reviewed the response by the licensee to each finding and observation and determined that the licensee has taken appropriate action so that all findings could be closed ou All findings have been closed out in a timely manne No violations ur deviations were identifie.
Open Items Open items are matters which have been discussed with the licensee, which will be reviewed further by the inspector and which involve some action on the part of the NRC or licensee or bot Open items disclosed during the inspection are discussed in Sections 3, 7, 8 and.
Exit Meeting The inspectors met with licensee representatives denoted in Section 2 at the conclusion of the inspection on May 15, 198 The scope and findings of the inspection were discusse The licensee acknowledged the need to:
Upgrade the on-line monitors
Improve laboratory space
Fully implement the QA/QC program
- During the inspection, the inspectors discussed the likely informational content of the inspection report with regard to documents or processes reviewed by the inspector during the inspectio Licensee representa-tives did not identify any such documents or procedures as proprietar Attachment:
Table II, Confirmatory Measurement Program Results, Second Quarter, 1986
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TABLE 2 U S NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT CONFIRMATORY MEA:3UREMENTS PROGRAM FACILITY: DRESDEN FOR THE 2 QUARTER OF 1986
NRC-------
- 3AMPLE I SOTOPE RESULT ERROR
LI CEN::::EE----
RE:::;1_IL T ERF.:OR L 1,.,1A:::;TE GRO:::S B 7.
H-3 7 *-* *
SR-8'7'
1.
A=AGREEMENT
[-=
I E;AGF.:EEMENT
~
TERIA RELAXED
- N COMPAP I :;:;ON
6E-05 1E-03 1E-07 7E-08 4. OE-06 c:" lE-05 o. OE-01
- -'*
4. OE-05 7 3E-03 o. OE-01
- -*i::
.-, OE-08 c:" OE-0'7'
o. OE-01 L *
- -'*
c:" *-** OE-09 4. OE-0'7'
2. OE-09
---LICENSEE:NRC----
RATIO RES T
6. ?E-01 1. 9E 0 1
[I 1. lE 00
I
- 7E 01 A
4. SE-02 c:"
- -'" 5E 00
[I 2.. 4E-01 7 *-** 4E 00 N
- .. 1. *
.
- ATTACHMENT 1 CRITERIA FOR COMPARING ANALYTICAL MEASUREMENTS This attachment provides criteria for comparing results of capability tests and verification measurement The criteria are based on an empirical relationship which combines prior experience and the accuracy needs o~*khis progra In these criteria, the judgment limits are variable in relation to the com-parison of the NRC 1 s value to its associated one sigma uncertaint As that ratio, referred to in this program as 11Resolution
, increases, the acceptability of a 1Jcensee 1 s measurement should be more selectiy Conversely, poorer agreement should be considered acceptable as the resolution decrease The values in the ratio criteria may be rounded to*fewer significant figures to maintain statistical consistency with the number of significant figures reported by the NRC Reference Laboratory, unless such rounding will result in a narrowed category of acceptanc RESOLUTION RATIO = LICENSEE VALUE/NRC REFERENCE VALUE Agreement
<3 No Co;nparison 23 and
<4
-.5
.?:,4 and
<8.0 2.,8 and
<16 i. 67
>16 and
<51 0.75 -
1. 33
>51 and
<200 0.80 -
1. 25 2200 0.85 -
1.18 Some discrepancies may result from the use of different equipment, techniques, and for some specific nuclides. These may be factored into the acceptance criteria and identified on the data sheet.