NRC-89-0221, Provides Results of Sample Line Loss Test & Evaluations Conducted to Fulfill License Condition 15 & Forwards Rept Entitled, Radioiodine & Particle Transmission Through Sample Lines for Standby Gas Treatment Sys Effluents....

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Provides Results of Sample Line Loss Test & Evaluations Conducted to Fulfill License Condition 15 & Forwards Rept Entitled, Radioiodine & Particle Transmission Through Sample Lines for Standby Gas Treatment Sys Effluents....
ML19324B750
Person / Time
Site: Fermi DTE Energy icon.png
Issue date: 10/31/1989
From: Sylvia B
DETROIT EDISON CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19324B751 List:
References
CON-NRC-89-0221, RTR-NUREG-0737, TASK-2.F.2, TASK-TM NUDOCS 8911080141
Download: ML19324B750 (5)
v • d • e


Text

6 B. Reiph $yhr'd benior Vici Prmoent

D#.roit f

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mm dison ~>;400 North oinee Highway 4

0::tober 31,1989

a. NIC-89-0221 4C U. S. Nuclear Regulatory Commission

. Attn: Document Control Desk Washington, D. C. 20555

Reference:

1) Fermi 2 NFC Docket No. 50-341 NIC License No. NPF-43
2) NUREG-0798, Supplement No. 6, Safety Evaluation Related to the Operation of Fermi 2, Section 22, Item II.F.l(2) , datcd July 1985

Subject:

Iodine / Particulate Sanpling System - Licence Condition luc. (15)__

Reference 2 provided the NIC Staff's final evaluation of the acceptability of Fermi 2's conpliance with the 'IMI Action Plan, NUREG-0737, Item II.F.2, Attachnent 2 on "Sanpling and Analysis of Plant Effluents". In Reference 2 the NIC Staff states that accident

. monitoring instrunentation shouki include provisions for the continuous collection of representative savples of iodine radioisotopes and particulates. The NIC further concludes that ,

"(1) collection of representative sanples neans obtaining t' e best sanples practicable given the exigencies which atterd the accident environnents. (2) line losses or line d@osition should be enpirically determined, and (3) appropriate loss correction factors should be applied." Accordingly, the Fermi 2 Operating License was conditioned

{per License Cordition L.C. (15) } by the NIC to require the following:

" Prior to startup following the first refueling outage, DIro shall demonstrate that the operating iodine / particulate sanpling system will perform its intended function."

'Ihe purpose of this letter is to provide the results of the sanple line loss test and evaluations corducted to fulfill License Condition L.C. (15) .

Attached herein is a rcport entitled "Radioicaine ard Particulate Transmission Through Sample Lines for SGTS Effluents at Fermi 2".

This report, dated Septenber 1989, was preparcd by Science 00f

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1 USNIC October 31, 1989 NIC-89-0221 Page 2 i

Applications International Corporation (SAIC) for the Detroit Edison Coupany (DECO) . The report contains the results of noasurenants and  ;

calculations performed at SAIC's Rockville Laboratory Radiolodine Line 'j Loss Test Facility to estinate radioiodine and particle transmission -

through selected sanpling lines at Fermi 2. The sanpling lines evaluated were those used to nonitor the StaMby Gas Treatment System (SGTS) discharge. Two lines carry sanples to the SPING nonitors and two lines carry sanples to the AXM nonitor grab sanpling locations. 'j The AXM lines are relied upon for the collection of post-accident grab sanples of radiolodines and radioactive particles in gaseous effluents.

For radioiodine transmission, elemental iodine is the most rezctive of .-

the gaseous species expected in reactor effluents under normal and l post-accident coMitions. It deposits on canple line surfcces and may  :

i later be resuspended or tightly bound to the surfece. Estimates of the deposition, fixation, and resuspension parameters for radioiodine were obtained from measurenents made as part of this and previous j

~

studies to estimate these transmission factors for the SG"3 lines.

Transmission parameters for radioactive particulates through the SGTS canple lines are based upon the " DUCT" code developed by SAIC. This code provides cciculations based upon empirical neasurennnts .of particle deposition for various particle sizes and densities, which are the nost inportant particle characteristics for these considerations. The final transmission factors account for the High Efficiency Particulate Air (HEPA) filters used in the SGTS.

It is inportant to note from the attached report that the sanple lines (

operate at tenperatures as high as 51 degrees Centigrade with an l airstream relative humidity as high as 97%. UnSer high humidity conditione, it is inportant to assure that the air stream does not cool to the saturation temperature. If coMensation of water vapor were to occur in the sanple lines, the transmission of radiolodines l

would be inpalteS and the sanples less reliablo. The results presented in this report are predicated on the assunption that the '

i SG'IS sanple line heat tracing will operate as designed and that condensation of water vapor does not occur.

Deco will develop accurate rcproducible baseline data by test for each l

heat tracing circuit to ensure it is at or above its minimum acceptable temperature in conjunction with existing equipment history. Each circuit will be adjusted as needed to ensure current ,

I operability. These totions will be conpleted prior to full power l operation fcllowing completion of the 1st Refueling Outt.ge. To ensure the heat tracing will continue to perform its inten3ed function in l

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t October 31, 1989 '

'NHC-89-0221 i

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maintaining the reliability.of the SGTS accident range nonitoring system sanples, DICo is committing to the following actions:

1. Surveillance Procedures 24.404.02 and 24.404.04, for Division I '

and II SGTS respectively, perform the SGTS filter and Secondary Containment isolation danper operability tests. These procedures ,

will be revised by adding sttps to require the operator to check  ;

. for proper anperage to each of the ten (10) beat tracing sections. This can be acconplished on Panels Dll-P400A & B using the pusL-to-test buttons for each sectiorrof + he heat tracing in each division of SGT3. This heat tracing operabildty check will be conducted on a nonthly basis. These proceduros will be revised by December 31, 1989. ,
2. A preventative maintenance (PM) activity will be established to l maintain SG1B heat tracing equipnent operability. This 18 nonth i PM will establish acceptance criteria for the temperature band allowed t'or the SGTS sanple lines heat tracing so as to fulfill the requirements of the attached rctort. This PM will be established by March 31, 1990. l
3. The plant licensed and non-licensed operations personnel will be ,

given formal training on the inportance of the SGTS sample lines J heat tracing in assuring a reliable accident range effluent nonitoring cystem sanplc. 7his training will be conducted prior I to. inplomontation of the procedurec noted above in item 1.

g The Radioiodine Line Loss Test Facility in SAIC's Rockville Laboratory

. has been used to neasure the transmission of elemental iodine (I2 )

l4 through replicas of air sanpling lines. Elenental iodine is the nost l reactive of the gaseous ra31olodine species expected in reactor

' effluents
under post-accident conditions. It d@osits on surfaces and i may later be resuspendeS or tightly bourx3 to the surface.

1 Transmission of I-131 through' the lines vas neasured and the data analyzed to determine average deposition velocities for I 2 in the lines.

t The following results were obtained:

Initial (2-h) Post-Accident Transmission LiDE. Factor for Elenental Railoloding AXM DIV I 0.84 i AXM DIV II 0.86

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^ I Ust@c i o October 31, 1989 i MC-89-0221  :

Page 4 1

l Expected changes in Tresmission Factors for Total Gaseous Icdine  !

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14ne 2b bh 2.0b DLh 2.0.Ch AXM DIV I 0.84 0.86 0.88 (,s1 0.99 j AXM DIV II 0.86 0.88 0.89 0.92 0.99  !

During the initiation of en accident, an initial sharp increase in e3cnental icdines in ecznparison to hypoiodous acid (ICI) and organic icdines are experienced. Of all the iodine species, elemental iodines .

cverience the greatest deposition ard subsequent sanple line loss.

As tine pastes, however, the mixture of raidolcdine species in the .

c3osed containnent building is expected to change. FJerental iodine  ;

concentration will becone a smaller fraction of the total gaseous i iodine inventory which will push the transmission factor towards 1.0.

In conclusion, initial accident conditions will result in >

. approxinataly 15% less than actual total gaseous ra$ioicdine samling

'" results. In order to corrcct for this loss, a sanple line loss  :

correction factor should be applied in the calculations for sanple analysis. In Procedure iPP-78.000.65 (AxM SAMPLI!G A!D A!EYSIS), i Attaclant 1, Part B, a 15% correction is already applied to the l canple volune calci 21ations for iodine ard particulate plateout.

Although particulate plateout is minimal throughout and radioicdine plateout is esrenti. ally norexistent at 200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br />, maintaining a 15%

correction factor for all conditions can only drive the analysis results tcuard a conservativo direction. Thus, no further charges to prccedure iTP-78.000.65 are required to conply with L.C. (15) .

The above actions, in conjunction with the attachcd report are considered to fulf All Ferni 2 Operating License Condition L.C. (15) .

If you should have: any questions, please contact Mr. Terry L. Riley, Supervisor of Conpliance ard Special Projects, Ibc3 car Licensing, at (313) 585-4041 (or x-1684),

s Sincerely, p .

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