# CALIBRATION OF ORNL LID-TANK FISSION PLATES

## Abstract

The SP-2 fission plate in the ORNL Lid Tank Shielding Facility was calibrated on three occasions and these data were used for a retrospective reclibration of SP-1, whose nonuniform geometry made its original, calibration suspect. The three independent calibration experiments performed to determine the fission rate in SP-2 were: thermalneutron flux and utilization; neutron- generation rate; and heat-generation rate. A weighted average of these methods gives a fission rate of 1.62 x 10" plus or minus 5% fissions/sec of equivalent to 5.18 plus or minus 5% watts of reactor power. The weighted average effective source strengths of LTSF fission plates are 1.7 and 1.14 watts for neutrons ard gamas in SP-I and 4.87 and 4.56 watts in SP-2. The large difference in the effective power of SP-1 is attributed to encessive self-absorption of gammas by the thick SP-1 components. (B.O.G.)

- Authors:

- Publication Date:

- Research Org.:
- Pratt and Whitney Aircraft Div., United Aircraft Corp., Middletown, Conn.; Convair, San Diego, Calif.

- OSTI Identifier:
- 4191916

- NSA Number:
- NSA-14-013409

- Resource Type:
- Journal Article

- Journal Name:
- Nucleonics (U.S.) Ceased publication

- Additional Journal Information:
- Journal Volume: Vol: 18, No. 4; Other Information: Orig. Receipt Date: 31-DEC-60

- Country of Publication:
- Country unknown/Code not available

- Language:
- English

- Subject:
- PHYSICS; ABSORPTION; CONFIGURATION; FISSION; GAMMA RADIATION; GAMMA SOURCES; HEATING; LIFETIME; MULTIPLICATION FACTORS; NEUTRON FLUX; NEUTRON SOURCES; PLATES; POWER; STANDARDS; THERMAL NEUTRONS; THERMAL UTILIZATION; THICKNESS

### Citation Formats

```
McCool, W J, and Otis, D R.
```*CALIBRATION OF ORNL LID-TANK FISSION PLATES*. Country unknown/Code not available: N. p., 1960.
Web.

```
McCool, W J, & Otis, D R.
```*CALIBRATION OF ORNL LID-TANK FISSION PLATES*. Country unknown/Code not available.

```
McCool, W J, and Otis, D R. Fri .
"CALIBRATION OF ORNL LID-TANK FISSION PLATES". Country unknown/Code not available.
```

```
@article{osti_4191916,
```

title = {CALIBRATION OF ORNL LID-TANK FISSION PLATES},

author = {McCool, W J and Otis, D R},

abstractNote = {The SP-2 fission plate in the ORNL Lid Tank Shielding Facility was calibrated on three occasions and these data were used for a retrospective reclibration of SP-1, whose nonuniform geometry made its original, calibration suspect. The three independent calibration experiments performed to determine the fission rate in SP-2 were: thermalneutron flux and utilization; neutron- generation rate; and heat-generation rate. A weighted average of these methods gives a fission rate of 1.62 x 10" plus or minus 5% fissions/sec of equivalent to 5.18 plus or minus 5% watts of reactor power. The weighted average effective source strengths of LTSF fission plates are 1.7 and 1.14 watts for neutrons ard gamas in SP-I and 4.87 and 4.56 watts in SP-2. The large difference in the effective power of SP-1 is attributed to encessive self-absorption of gammas by the thick SP-1 components. (B.O.G.)},

doi = {},

url = {https://www.osti.gov/biblio/4191916},
journal = {Nucleonics (U.S.) Ceased publication},

number = ,

volume = Vol: 18, No. 4,

place = {Country unknown/Code not available},

year = {1960},

month = {4}

}