ML11342A053

Supplement to Letter Dated November 17th 2011: Request for the Amendment to the University of Utah Triga Reactor Technical Specification 3.5, Ventilation System, Specification 1, and to TS 4.4, Confinement, Basis

ML11342A053
Person / Time
Site:	University of Utah
Issue date:	11/29/2011
From:	Jevremovic T Univ of Utah
To:	Wertz G A Document Control Desk, Licensing Processes Branch (DPR)
References
Download: ML11342A053 (6)

Text

N50 S. Central Campus Dr. MEB 2298 Salt Lake City, UT 84112 y CIF IPhone: 801.587.9696 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Utah Docket 50-407 Attention:

Geoffrey Wertz

SUBJECT:

Supplement to letter dated November 17th 2011: Request for the Amendment to the University of Utah TRIGA Reactor Technical Specification 3.5, Ventilation System, Specification 1, and to TS 4.4, Confinement, Basis

Dear Mr. Wertz:

This supplement letter provides marked-up pages that were omitted in letter dated November 17th 2011, and in addition it provides the proposed TS pages as attached.Sincerely, Tat evremovic, PhD Chair Professor in Nuclear Engineering and Director UNEP/UNEF The University of Utah Salt Lake City UT 84112 Phone: 801-587-9696 Email: Tatjana.]evremovic@utah.edu I declare under penalty of perjury that the fore going is true and correct.Executed on / 11--/ --------------------------

---

Date ignartu./m.L N50 S. Central Campus Dr. MEB 2298 Salt Lake City, UT 84112 ,Sl*y l_____I________Phone:

801.587.9696 cc: Mayor of Salt Lake City 451 South State Room 306 Salt Lake City, UT 84111 Dr. Thomas Parks Vice president for research 201 S. President Circle, Room 210 University of Utah Salt Lake City, UT 84112 Ms. Karen Langley Director, University of Utah Radiological Health 322 RAB University of Utah Salt Lake City, UT 84112 Dr. Cynthia Furse Associate Vice President for Research 210 President Circle, Room 210 University of Utah Salt Lake City, UT 84112 Dr. Richard Brown Dean, College of Engineering 72 S. Central Campus Dr., 1650 WEB University of Utah Salt Lake City, UT 84112 2 UUTR TECHNICAL SPECIFICATIONS AND BASES 3.5 Ventilation System ApDlicabilitv This specification applies to the operation of the reactor area ventilation system.Obiective The objective is to assure that the ventilation system shall be in operation to mitigate the consequences of possible releases of radioactive materials resulting from reactor operation.

Specifications 0.01 The reactor shall not be operated unless the ventilatisystem is fully operable which is when: 1. The pressure difference between the reactor m and outside of the Merrill Engineering Building Is larger than 0. inches-of-water.

2. In the event of a substantial release of airborne radioactivity within the reactor area, the ventilation system will be secured or operated in the limited intake mode to prevent the release of a significant quantity of airborne radioactivity from the reactor area.Basis In the operational mode of the ventilation system, the air In the controlled access area (reactor room area) is constantly being exchanged.

The air leaving the facility has a volumetric flow rate of more than 100 CFM per each of the two fume hoods. The result of this is a negative pressure of greater than 0.01 inches of water in the reactor room.The worst-case maximum total effective dose equivalent is well below the applicable annual limit for individual members of the public and building residents during the maximum hypothetical accident (MHA) (SAR 13.2.1).IPage 26 UUTR TECHNICAL SPECIFICATIONS AND BASES 4.4 Confinement Applicability This specification applies to the reactor confinement.

Objective The objective is to assure that air is swept out of confinement and exhausted through a monitored release point (two fume hood systems located at Fuel Inspection area).Specification The ventilation system shall be verified operable in accordance with TS 4.5 monthly.Basis Because the ventilation system Is the only equipment required to achieve confinement, operability checks of the ventilation system meet the functional testing requirements for confinement.

The pressure difference between the reactor room and outside of the Merrill Engineering Building should be larger than 0.1 inches-of-water.

To keep this pressure difference, two fume hoods should be operated the flow rate of 90 CFM or higher. Current flow rate for two fume hoods are >100 CFM.IPage 42 UUTR TECHNICAL SPECIFICATIONS AND BASES 3.5 Ventilation System Applicability This specification applies to the operation of the reactor area ventilation system.Obiective The objective is to assure that the ventilation system shall be in operation to mitigate the consequences of possible releases of radioactive materials resulting from reactor operation.

Specifications The reactor shall not be operated unless the ventilation system is fully operable which is when: 1. The pressure difference between the reactor room and outside of the Merrill Engineering Building is larger than 0.01 inches-of-water.

2. In the event of a substantial release of airborne radioactivity within the reactor area, the ventilation system will be secured or operated in the limited intake mode to prevent the release of a significant quantity of airborne radioactivity from the reactor area.Basis In the operational mode of the ventilation system, the air in the controlled access area (reactor room area) is constantly being exchanged.

The air leaving the facility has a volumetric flow rate of more than 100 CFM per each of the two fume hoods. The result of this is a negative pressure of greater than 0.01 inches of water in the reactor room.The worst-case maximum total effective dose equivalent is well below the applicable annual limit for individual members of the public and building residents during the maximum hypothetical accident (MHA) (SAR 13.2.1).JPage 26 UUTR TECHNICAL SPECIFICATIONS AND BASES 4.4 Confinement Applicability This specification applies to the reactor confinement.

Obiective The objective is to assure that air is swept out of confinement and exhausted through a monitored release point (two fume hood systems located at Fuel Inspection area).Specification The ventilation system shall be verified operable in accordance with TS 4.5 monthly.Basis Because the ventilation system is the only equipment required to achieve confinement, operability checks of the ventilation system meet the functional testing requirements for confinement.

The pressure difference between the reactor room and outside of the Merrill Engineering Building should be larger than 0.01 inches-of-water.

To keep this pressure difference, two fume hoods should be operated with the flow rate of 90 CFM or higher. Current flow rate for two fume hoods are >100 CFM.IPage 42