US3894912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Determination of parameters of a nuclear reactor through noise measurements
Assignee: United States Department of Energy
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Filing: 1973-12-21
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Granted: 1975-07-15
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Expires: 1993-12-21
Abstract
Abstract This invention relates to a method of measuring parameters of a nuclear reactor by noise measurements. Noise signals are developed by the detectors placed in the reactor core. The polarity coincidence between the noise signals is used to develop quantities from which various parameters of the reactor can be calculated.
Inventors
- 👤 Charles E Cohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:06
CPC Classifications
G; G06; G06J; G06J1/00; G21; G21C; G21C17/00; G21C17/10; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
279 words
THE METHOD OF MAKING REACTOR MEASUREMENTS TO DETERMINE RACTOR PRAMETERS A1 B1 A2, B2 AND $1 FROM WHICH AN UNKNOWN SUBCRITICALITY OF A NUCLEAR REACTOR CAN BE CALCULATED INCLUDING THE STEPS OF: A. MEASURING THE NEUTRON DENSITY FLUCTUATION AT TWO DIFFERENT POINTS IN THE NUCLEAR RACTOR TO DEVELOP FIRST AND SECOND NOISE SIGNALS, B. FILTERING EACH OF SAID FIST AND SECOND NOISE SIGNALS IN FIRST AND SECOND BAND-PASS FILTERS RESPECTIVELY, THE BAND OF FREQUENCIES PASSED BY EACH OF SAID BAND-PASS FILTERS BEING THE SAME AND BEING ABOVE THE DELAYED NEUTRON ROLL-OFF FREQUENCIES AND BELOW THE PROMPT NEUTRON ROLL-OFF FREQUENCY, C. MULTIPLYING SAID FILTERED FIRST AND SECOND NOISE SIGNALS IN AN ANALOG MULTIPLIER TO DEVELOP A FIRST PRODUCT SIGNAL WITH SAID FIRST AND SECOND NOISE SIGNALS HAVING THE SAME POLARITY AND A SECOND PRODUCT SIGNAL WITH SAID FIRST AND SECOND NOISE SIGNALS HAVING OPPOSITE POLARITIES, D. ESTABLISHING THE REACTOR AT A SUBERITICALITY GREATER THAN 1$ SUBCRITICAL AND LESS THAN CRITICAL AND MEASURING A REFERENCE SUBCRITICALITY $1 BY A ROD DROP TEST, E. WITH THE RACTOR AT SAID REFERENCE SUBCRITICALLY INTEGRATING SAID FIRST PRODUCT SIGNAL OVER A PREDETERMINED TIME PERIOD T1 TO DEVELOP THE REACTOR PARAMETER A1, WHERE 30 SECONDS < T1 < 10 MINUTES, F. WITH THE RACTOR AT SAID REFERENCE SUBCRITICALITY INTEGRANTING SAID SECOND PRODUCT SIGNAL OVER SAID TIME PERIOD T1 TO DEVELOP THE REACTOR PARAMETER B1, G. WITH THE RACTOR AT THE UNKNOWN SUBSCRITICALLY INTEGRATING SAID FIRST PRODUCT SIGNAL OVER A TIME PERIOD T2 TO DEVELOP AN INTEGRATED PRODUCT SIGNAL A2, WHERE 30 SECONDS < T2 <10 MINUTES, AND H. WITH THE REACTOR AT THE UNKNOWN SUBSCRITICALLY INTERGRATING SAID SECOND PRODUCT SIGNAL OVER SAID TIME PERIOD T2 TO
Claim 2
Independent Claim
279 words
THE METHOD OF MAKING REACTOR MEASUREMENTS TO DETERMINE RACTOR PRAMETERS A1 B1 A2, B2 AND $1 FROM WHICH AN UNKNOWN SUBCRITICALITY OF A NUCLEAR REACTOR CAN BE CALCULATED INCLUDING THE STEPS OF: A. MEASURING THE NEUTRON DENSITY FLUCTUATION AT TWO DIFFERENT POINTS IN THE NUCLEAR RACTOR TO DEVELOP FIRST AND SECOND NOISE SIGNALS, B. FILTERING EACH OF SAID FIST AND SECOND NOISE SIGNALS IN FIRST AND SECOND BAND-PASS FILTERS RESPECTIVELY, THE BAND OF FREQUENCIES PASSED BY EACH OF SAID BAND-PASS FILTERS BEING THE SAME AND BEING ABOVE THE DELAYED NEUTRON ROLL-OFF FREQUENCIES AND BELOW THE PROMPT NEUTRON ROLL-OFF FREQUENCY, C. MULTIPLYING SAID FILTERED FIRST AND SECOND NOISE SIGNALS IN AN ANALOG MULTIPLIER TO DEVELOP A FIRST PRODUCT SIGNAL WITH SAID FIRST AND SECOND NOISE SIGNALS HAVING THE SAME POLARITY AND A SECOND PRODUCT SIGNAL WITH SAID FIRST AND SECOND NOISE SIGNALS HAVING OPPOSITE POLARITIES, D. ESTABLISHING THE REACTOR AT A SUBERITICALITY GREATER THAN 1$ SUBCRITICAL AND LESS THAN CRITICAL AND MEASURING A REFERENCE SUBCRITICALITY $1 BY A ROD DROP TEST, E. WITH THE RACTOR AT SAID REFERENCE SUBCRITICALLY INTEGRATING SAID FIRST PRODUCT SIGNAL OVER A PREDETERMINED TIME PERIOD T1 TO DEVELOP THE REACTOR PARAMETER A1, WHERE 30 SECONDS < T1 < 10 MINUTES, F. WITH THE RACTOR AT SAID REFERENCE SUBCRITICALITY INTEGRANTING SAID SECOND PRODUCT SIGNAL OVER SAID TIME PERIOD T1 TO DEVELOP THE REACTOR PARAMETER B1, G. WITH THE RACTOR AT THE UNKNOWN SUBSCRITICALLY INTEGRATING SAID FIRST PRODUCT SIGNAL OVER A TIME PERIOD T2 TO DEVELOP AN INTEGRATED PRODUCT SIGNAL A2, WHERE 30 SECONDS < T2 <10 MINUTES, AND H. WITH THE REACTOR AT THE UNKNOWN SUBSCRITICALLY INTERGRATING SAID SECOND PRODUCT SIGNAL OVER SAID TIME PERIOD T2 TO
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |