IR 05000280/1988013
| ML18153B527 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 09/27/1988 |
| From: | Dan Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8810120371 | |
| Download: ML18153B527 (4) | |
Text
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SEr. cJ,;-:,i Virginia Electric and Power Company ATTN:
Mr. W.R. Cartwright, Vice President,
- Nuclear Operations P. 0. Box 26666 Richmond, VA 23261 Gentlemen:
SUBJECT:
DOCKET NOS. 50-280 AND 50-281, CONFIRMATORY MEASUREMENT RESULTS, SUPPLEMENT TO INSPECTION REPORT NOS. 50-280/88-13 AND 50-281/88-13 As part of the NRC Confirmatory Measurements Program, spiked liquid samples were sent on June 2, 1988, to your Surry facility for selected radiochemical analyse We are in receipt of your analytical results transmitted to us by your letter dated August 8, 1988, and.the following comparison of your results to the known values are presented in Enclosure 1 for your informatio The acceptance criteria for the comparisons are listed in Enclosure In our review of these data all comparative results.were in agreemen These data should be reviewed in greater detail by cognizant staff members for any significant trends in the data among successive years in which samples have been analyzed by your facilit Mr. B. Garber of.. your Surry facility staff, was.informally notified of these results by telephone conversation on September 19, 198 These results and any results from previous years pertaining to these analyses will be discussed at future NRC inspection Enclosures: Confirmatory Measurement Comparisons Criteria for Comparing Analytical Measurements cc w/encls:
D. L. Benson, Station Manager N. E. Hardwici, Manager - Nuclear Programs and Licensing Commonwealth of Virginia bee w/encls:
(See page 2)
8810120371 880927
~DR AD0CK 05000280 i
PNU
Sincerely, Jriginal Signed By o. M. Collins Douglas M. Collins, Chief Emergency Preparedness and Radiological Protection Branch Division of Radiation Safety and Safeguards
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Virginia Electric and Power Company bee w/encls:
NRC Resident Inspector DRS Technical Assistant Document Control Desk RII ~~
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Isotope H-3
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Fe-55 sr..:89 Sr-90 ENCLOSURE 1 CONFIRMATORY MEASUREMENT COMPARIONS OF H-3, Fe-55, Sr-89, AND Sr-90 ANALYSES FOR SURRY NUCLEAR PLANT ON AUGUST 8, 1988 Licensee NHC Ratio ( uCi /ml l ( uCi /ml l Resolution (Licensee/NHCl Comparison 1. 95 E-05 2.05 0.04 E-05
0.95 Agreement 1.90 E-05 2;01 0.04 E-05
0.95 Agreement 1. 50 E-04 1, 51J 0.05 E-04
0.97 Agreement 1. 00 E-05 9. 30 0.37 E-06
1. 08 Agreement
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ENCLOSURE 2 CRITERIA FOR COMPARING ANALYTICAL MEASUREMENTS This enclosure 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 of this progra In these criteria, the judgment limits denoting agreements of disagreement between licensee and NRC results are variable. This variability is a function of the NRC's value relative to its associated uncertainty, referred to in this program as 11 Resolution 111 increases, the range of acceptable differences between the NRC and licensee values should be more restrictiv Conversely, poorer agreement between NRC and licensee values must be considered acceptable as the resolution decrease For comparison purposes, a ratio 2 of the licensee value to the NRC value for each inc:tividual nuclide is compute This ratio is then evaluated for agree-ment based on the calculated resolutio The corresponding resolution and calculated ratios which denote agreement are listed in Table 1 belo Values outside of the agreement ratios for a selected nuclide are considered in disagreemen *
1 Resolution= NRC Reference Value for a Particular Nuclide Associated Uncertainty for the Value 2 Comparison Ratio= Licensee Value NRC Reference Value TABLE 1 Confirmatory Measurements Acceptance Criteria Resolutions vs. Comparison Ratio Resolution
<4 4 - 7 8 - 15 16 - 50 51 - 200
>200 Comparison Ratio for Agreement 2. *5.5 0.6 -
0.75 -
-0. 80 -
0.85
- 2. 0 1. 66 1. 33 1. 25 1. 18