ML20056H491
| ML20056H491 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 08/18/1993 |
| From: | Vitkus T OAK RIDGE ASSOCIATED UNIVERSITIES |
| To: | Fauver D NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 9309090425 | |
| Download: ML20056H491 (2) | |
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M ORISE OAK R f DC.t #NS i t i t J1 E F OR SCIE NCE AND E DUC AT ION
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t.34 r i e *zIi e t1 August 18,1993 i
Mr. David Fauver Division of Low-Level Waste Management - NMSS U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Rockville, MD 20852 l
SUBJECT:
COMMENTS ON THE JULY 1,1993 CORRESPONDENCE FROM L.M.
l HILL, LONG ISLAND POWER AUTHORITY (LIPA) TO R. BERNERO, NUCLEAR REGULATORY COMMISSION (NRC)
Dear Mr. Fauver:
ESSAP has reviewed the subject document and offers the attached comments and clarifications for your consideration. Please do not hesitate to contact either myself at (615) 576-5073 or Michele Landis at (615) 576-2908 should you have any questions.
l Sincerely,
~
ay Timothy J. Vitkus Environmental Project Leader Environmental Survey and Site Assessment Program 1
TJV:kew Attachment i
cc:
T. Mo, NRC/NMSS, 6H3 j
D. Tiktinsky, NRC/NMSS, 6E6 i
L. Pattiglio, NRC/5E2 J. Swift, NRC/6H3 R. Nimitz, NRC/ Region I J. Berger, ESSAP M. Landis, ESSAP PMDA, NRC/6E6
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I't File /202 I
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9309090425 930818 I
pg R O. BOX 117. O,x ROGE. TENNESSEE 37831-0117 Monoged and operated by Ook Ridge Associated Universities for the U 5 Department of Energy I
i 1.
LIPA Response No. 2, Page 2, and LIPA April 16,1993 memo, Attachment 2: ESSAP 2
has reviewed LIPA's response and the supporting memo for the use of the 252 cm large area detectors (LADS). As described in the memo, ESSAP agrees that LIPA will be able to demonstrate compliance with both the average and maximum allowable NRC contamination guidelines when using the LADS with one noted exception. That is, the alarm setting of 805 net counts per minute (nepm) should be reduced by a factor of 1.2 to 671 nepm to account for Fe-55 contribution.
However, the Shoreham Termination Survey Plan specifies that any measurement in 2
excess of 5,000 dpm/100 cm would be investigated. In order to meet this obligation, an action level of 320 ncpm (267 nepm considering Fe-55 contribution) would be l
appropriate. This count rate is what the LAD would detect if an activity level of 5,000 2
dpm were present in an area of 100 cm or less.
2.
ESSAP would like to clarify the differences in tb Direct Measurement Comparison Tables which LIPA and ESSAP provided to the NRC.
The differences may be summarized as follows:
The initial Table prepared during the May 26, 1993 instrumentation comparison contained a 16% efficiency factor which LIPA provided for the LIPA detector / instrument combination of HP-260 #1009/ ESP-2 #1647. Based on this efficiency, the geometry corrected activity for the Tc-99 calibration source is 78,100 as indicated in LIPA's
- . ESSAP used the 10.9% HP-260 efficiency factor, presented in LIPA's Termination Survey Plan, for conversion and presentation of LIPA data in Table 1.
i Similarly, the 4.9 % and 16.1 % efficiencies for the APTEC 126 and 252 detectors (LIPA l ) were replaced with the LIPA Termination Survey Plan stated efficiencies i
of 3.9% and 6.4%, respectively.
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