Anticipated transients without scram (ATWS) in aboiling water reactor (BWR) were simulated in order to understand reactor response and determine the effectiveness of automatic and operator actions to mitigate this beyond-design-basis accident. The events of interest herein are initiated by a turbine trip when the reactor is operating in the expanded operating domainMELLLA+ [maximum extended load line limit plus]. In these events the reactor may initially be at up to 120% of the original licensed thermal power (OLTP) and at flow rates as low as 80% of rated.For these (and similar) ATWS events the concern isthat when the reactor power decreases in response to a dual recirculation pump trip, the core will become unstable and large amplitude oscillations will begin. The occurrence of these power oscillations, if left unmitigated, may result in fuel damage, and the amplitude of the poweroscillations may hamper the effectiveness of the injection of dissolved neutron absorber through the standby liquid control system (SLCS).

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Photograph of Alicia Marie Suschena playing La Fée in the opera "Cendrillon" during a performance at Winspear Hall. Suschena is waving a wand in her right hand and gesturing with her left as she sings.

Photograph of Natalie Manning (center) playing Madame de la Haltière in the opera "Cendrillon" during a performance at Winspear Hall. Manning is standing between two other actors.

Photograph of Molly Clementz (front left) and Alicia Marie Suschena (front right) playing Cendrillon and La Fée, respectively, in the opera "Cendrillon" during a performance at Winspear Hall. Clementz is sitting center-stage as Suschena reaches for her face with one hand. Three other individuals are visible in the background.

Photograph of Molly Clementz (front left) and Madelaine Martinez (front right) playing Cendrillon and Le Prince Charmant, respectively, in the opera "Cendrillon" during a performance at Winspear Hall. Ball attendees are watching as Clementz and Martinez face each other. Martinez is kneeling.

Photograph of Molly Clementz (left) and Madelaine Martinez (right) playing Cendrillon and Le Prince Charmant, respectively, in the opera "Cendrillon" during a performance at Winspear Hall. Martinez is hugging Clementz from behind.

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Recording of the first Sunday afternoon performance of the opera "Cendrillon" at the UNT College of Music Lyric Theater.

Percussion concert performed at the UNT College of Music Voertman Hall.

A TRACE model has been developed for using theTRACE/PARCS computational package [1, 2] to simulate anticipated transients without scram (ATWS) events in a boiling water reactor (BWR). The model represents a BWR/5 housed in a Mark II containment. The reactor and the balance of plant systems are modeled in sufficient detail to enable the evaluation of plant responses and theeffectiveness of automatic and operator actions tomitigate this beyond design basis accident.The TRACE model implements features thatfacilitate the simulation of ATWS events initiated by turbine trip and closure of the main steam isolation valves (MSIV). It also incorporates control logic to initiate actions to mitigate the ATWS events, such as water levelcontrol, emergency depressurization, and injection of boron via the standby liquid control system (SLCS). Two different approaches have been used to model boron mixing in the lower plenum of the reactor vessel: modulate coolant flow in the lower plenum by a flow valve, and use control logic to modular.

Determines the effectiveness of automatic and operator actions of Anticipated transients without scram (ATWS).

The TRACE/PARCS computational package [1, 2] isdesigned to be applicable to the analysis of light water reactor operational transients and accidents where the coupling between the neutron kinetics (PARCS) and the thermal-hydraulics and thermal-mechanics (TRACE) is important. TRACE/PARCS has been assessed for itsapplicability to anticipated transients without scram(ATWS) [3]. The challenge, addressed in this study, is to develop a sufficiently rigorous input model that would be acceptable for use in ATWS analysis. Two types of ATWS events were of interest, a turbine trip and a closure of main steam isolation valves (MSIVs). In the first type, initiated by turbine trip, the concern is that the core will become unstable and large power oscillations will occur. In the second type,initiated by MSIV closure,, the concern is the amount of energy being placed into containment and the resulting emergency depressurization. Two separate TRACE/PARCS models of a BWR/5 were developed to analyze these ATWS events at MELLLA+ (maximum extended load line limit plus)operating conditions. One model [4] was used for analysis of ATWS events leading to instability (ATWS-I);the other [5] for ATWS events leading to emergency depressurization (ATWS-ED). Both models included a large portion of the nuclear steam supply system and controls, and …

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Photograph of Amy Henard (12) preparing to set a volleyball during a match against the University of Texas at El Paso in the Mean Green Volleyball Center. Henard can be seen in the central bottom portion of the image, facing to the right of the camera and raising both hands palm-up as the ball flies toward her from above.

Photograph of University of Texas at El Paso players Talia Jones (9) and Dominique Millette (4) attempting to block a spike by UNT's Courtney Windham (11) during a match in the Mean Green Volleyball Center. Windham can be seen mid-air, raising her right arm as a volleyball flies over the net toward her opponents, who are each raising both arms. Amy Henard (12) is standing next to Windham on the court.

Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.