ML20059K069

Provides Comments on from Lm Hill Lipa to R Bernero Re Shoreham Termination Survey Plan

ML20059K069
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	08/18/1993
From:	Vitkus T AFFILIATION NOT ASSIGNED
To:	Fauver D NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
NUDOCS 9311150175
Download: ML20059K069 (2)

Text

s ,

M  :

ORISE OAK fiKX.I IF-J Si g i t J1 ( f car SCif F4Cl A t 4LJ f ( R AC Af K..tr-J t t at F C 4 / t F J s'INf W 4Ml f 41 % N ". Il eAL i 4'lSH ' W J August 18,1993 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

SUBJECT:

COMMENTS ON THE JULY 1,1993 CORRESPONDENCE FROM L.M.

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) 576-50'/3 or Michele Landis at (615) 576-2908 should you have any questions.

Sincerely, ,

~

Y.

Timothy J. Vitkus Environmental Project Leader Environmer.tal Survey and Site Assessment Program TJV:kew Attachment cc: T. Mo, NRC/NMSS, 6H3 D. Tiktinsky, NRC/NMSS, 6E6 l L. Pattiglio, NRC/5E2 l J. Swift, NRC/6H3 R. Nimitz, NRC/ Region I l l J. Berger, ESSAP  ;

M. Landis, ESSAP '

PMDA, NRC/6E6 l File /202 9311150175 930sgg

• h I

p SOX 117 OAK FIDGE. TENNESSEE 37831 0117 l Managed and operrred by Ook Redge Associated Univeruties for the U1 Department of Energy

3-

, + . . ,

4

1. LIPA Respot .lo. 2, Page 2, and LIPA April 16,1993 memo, Attachment 2: ESSAP l 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 .i alarm setting of 805 net counts per minute (ncpm) should be reduced by a factor of 1.2 j 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 nepm (267 nepm considering Fe-55 contribution) would-be  !

appropriate. This count rate is what the LAD would detect if an activity level of 5,000 '

dpm were present in an area of 100 cm2 or less. ,

2. ESSAP would lihe to clarify the differences in the Direct Measurement Comparison  !

Tables which LIPA and ESSAP provided to the NRC. The differences may be j summarized as follows: l i

The initial Table prepared during the May 26, 1993 instrumentation companson l 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 l corrected activity for the Tc-99 calibration source is 78,100 as indicated in LIPA's t 9 Attachment 1. ESSAP used the 10.9% HP-260 efficiency factor, presented in LIPA's [

l Termination Survey Plan, for conversion and presentation of LIPA data in Table 1.  !

l Similarly, the 4.9% and 16.1% efficiencies for the APTEC 126 and 252 detectors (LIPA - [

Attachment 1) were replaced with the LIPA Termination Survey Plan stated efficiencies ,

of 3.9% and 6.4%, respectively. j i

i 1

)

l a- i j

4 1

1 l 4

L

'I t