ML20096C443

Forwards 911121 Memo Detailing Results of Univ Contacts W/ Reactor Staffs at Texas A&M Univ & North Carolina State Univ Re Vent Stack Monitoring & Bid Request Issued by Univ of Virginia to Purchase/Install Gaseous Monitoring Sys

ML20096C443
Person / Time
Site:	University of Virginia
Issue date:	12/02/1991
From:	Mulder R VIRGINIA, UNIV. OF, CHARLOTTESVILLE, VA
To:	Bassett C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 9205140005
Download: ML20096C443 (4)

Text

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s ENGINEERING El1 December 2, 1991 & APPLIED SCIENCE

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Mr. Craig Bassett U.S.N.R.C. Region 11 1 nncnm ot \irpma 101 Marietta Street, N.W. In ,a,r Emim Atlanta, GA 30323 cm,rit.nesune, VA ::yo.t:aa; si !4. 9:4.7] 3n i c\X Ni4.us:-:M4

Subject:

Update on UVAR gaseous monitoring system purchase plans.

Dear Mr. Basset:

Please find in attachment copies of the memorandum detailing the results of our contacts with the reactor staffs at Texas A&M and N.C. State regarding vent stack monitoring, and the bid request that has been issued by U.Va. for a gaseous monitoring system that we would like to purchase and install. The system would monitor noble gases in the reactor confinement and would be of more value than a vent stack monitor. Under severe accident scenarios, the vent stack f an would not be kept operating, the vent cover would close and potential releases from confinement would not be limited to the stack exit. Therefore, remote monitoring of the confinement would be of greater value in gauging condition severity and evolution. Also, we anticipate that the cost of this system would fall within the amount of the DOE equipraent grant.

If you have any questions, please feel free to contact me or our engineer Mr. Bouvard Hosticka at (804) 982-5440.

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MEMORANDUM-

Department of Nuclear Engineering and Engineering Physics-Schoci of Engineering and Applied Science University of Virginia-TO: - R.U. Mulder From: B. Hosticka. ,$d November 21,1991 Subj: Samplers at Texas A&M and N.C. State

1 Called Texas A&M about their " Stack Monitor _". What they call a stack monitor is a sampler to draw air from their central exhaust system across a 3X3 sodium iodide calibrated for argon 41. : They do this to monitor normal operational.

releases to ensure compliance with a technical specification limit on annual release

of argon-41. The person I spoks to also indicated that they have a particulate

- monitor on the main vent system that-draws air through a filter for counting. .

"Isokinetics and ANSI N13.1 were foreign terms to her. When I explained what they meant, she iridicated that no such considerations were taken in to the design of their system.'

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Fro'n N.C. State I got the folioWag information. Their stack' monitoring system was installed as part of the original construction of the facility. It has

-isokinetic samphng heads although probably not in_accordance with ANSI N13.1 (the person I spoke to has never reviewed ANSI N13.1 but believes that there is only one sampling port per flow condition). The system was not bought as a.

package and il)erefore has several vendors' components within it. They sample for only particulate and noble gasses in the stack, not for iodine. - As part of the DOE

upgrade' program they are spending $40,000 to $50,000 to replace the electronics of the stack monitor. The current mechanical components'_(sampling head, piping, L

moving paper particulate collector, gas chamber, pump, and flow control) are not :

u being replaced. This cost is consistent with what we have fouad in working with

! the vendors. I suspect that if the cost of the mechanical systems were added to the -

F upgrade, it too' would come out f xbe around $100,000.

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k Specifications-For an Area Noble Gas Monitor for the University of-Virginia Reactor Facility Instruments requirements-The reactor facility will need a commercial grade Noble Gas monitoring system taking local continuous samples with the characteristics as listed below.

It will normally monitor operationally produced Ar-41 in the

-reactor room where ambient radiation leve)s in the room are less than 0.5 mr/hr but may be called upon during accident conditions to monitor fission product gasses in much higher ambient radiation fields. Therefore, some means must be provided to monitor the ambient radiation level near the detector and comper. sating for it such that the actual nobel gas activity can be determined.

Noble Gas Monitor Characteristics

1. Continuous flow, non pressurized chamber

2. Means for subtracting signal from ambient radiation

3. Sensitive enough to detect 2 E-7 uC/ml of Ar-41 in the. sampled air 4 Allow remote reading via serial computer interface

5. Have analog output for driving strip chart recorder

6. Read out in Engineering units such as uCi/ml

7. Have Outputs for remote alarms Possible Vendors Below is a_ list of possible vendors for a noble gas l monitoring system. This list may not be exhaustive but l represents the vendors known to me at this time.

Eberline NRC Industries P.O. Box 2108 125 Titus Ave.

Santa Fe,_NM_ 87504-2108 Warrington, PA 18976 (505) 471-3232 (215) 343-5900 EG&G Berthold Sorrento Electronics 100 Midland Rd. P.O. Box 5189 Oak Ridge, TN 37831-0895 Cary, NC 27511 l (615)-483-0396 (919) 481-4425 L General Atomics Victoreen Inc.

P.O. Box 85608 10101 Woodland Ave.

L San Diego, CA 92138-5608 Cleveland, OH 44104 L (619) 455-4255 (216) 795-8200 l

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