PWR Fuel Status Assessment
COURSE DESCRIPTION
The PWR Fuel Status Assessment course was developed by NWT to assist plant and
corporate chemistry personnel to:
- Evaluate the various fuel activity release models
- Employ nuclide release distributions to assess fuel failure modes
- Estimate the number of fuel defects
- Assess the radiological impact of the fuel failure mode
This course was developed by senior NWT personnel who have been
involved in nuclear power plant radioactivity measurements and activity transport control
programs for over 30 years. This experience is complemented by a thorough understanding of
the underlying physical and chemical principles in each area of instruction. Because of
the nature of the course, senior NWT personnel provide all instruction (see resumes).
The course is intended for PWR chemistry personnel involved in fuel
status assessment and radiochemical measurements. It assumes that the student is familiar
with the fundamentals of radiochemistry. Students are requested to bring plant
radiochemistry data for discussion.
NWT BACKGROUND
NWT was formed in March 1974 to provide consulting and research and
development services to the nuclear utilities in the areas of water chemistry, water
treatment, corrosion, activity transport and radiochemistry. Since that time, NWT has
provided services to over 50 utilities in the U.S. and overseas with emphasis on problem
diagnosis. Extensive studies also have been performed on state-of-the-art technologies for
EPRI. NWT staff members have participated in industry committees chartered to develop PWR
and BWR chemistry guidelines for problem avoidance.
Several training courses on the application of problem assessment
techniques employed by the NWT staff during routine consulting activities have been
developed. Utility plant and general office personnel have confirmed that these classes
have been of significant value in their efforts to optimize their chemistry programs.
Based on the response to these courses the fuel status assessment
course, outlined below, was developed specifically to assist plant personnel actively
engaged in this area.
| COURSE OUTLINE I. Sources of Radioactivity
A. Radiochemistry
Fundamentals
B. Water Activation
C. Impurity Activation
D. Corrosion Product Activation
E. Fission Process and Fission Products
F. Transuranics
II. Process Impacts on Fission Product Concentrations
A. Hot Leg Vs. Letdown System Sampling
B. Letdown/VCT System Impact on RCS
Activity Concentrations
a) Letdown System Removal Constant
b) Formation of Noble Gas Activities
c) Noble Gas Removal/Leak Constant
d) Partitioning of Gases in VCT and Pressurizer
III. Failed Fuel Activity Release
Characterization
A. Release of Fission Products from Fuel
Under Normal Operation
a) Recoil Sources
b) Fuel Cladding Defects
B. Failed Fuel Characterization
a) Defect Models
b) INPO Fuel Reliability Index
c) EPRI CHIRON Computer Code
d) Source Term Distribution Plots
C. Cs-134/Cs-137 Ratios and Np-239
D. Trending Activity Measurements for
Fuel Status Evaluation
IV. Activity Measurement Requirements
A. Standard Technical Specifications
B. Dose Equivalent Iodine
C. Gross Activity and E-bar
D. Dose Equivalent Xe-133
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LECTURER
H. R. HELMHOLZ: Mr. Helmholz began his nuclear career in 1951 at
Hanford. He subsequently joined the Case Institute of Technology where he organized the
radiochemistry program and taught courses in nuclear chemistry. After several years at
KAPL and at NRTS at Idaho Falls, where he supervised the S5G chemistry laboratory, he
joined GE-Vallecitos and assumed responsibility for design and performance of chemical
test programs at operating BWRs. Since joining NWT in 1981, he has had responsibility for
numerous chemistry and radiochemistry projects including development of radioanalytical
procedures, plant chemistry reviews, training course development and presentation,
assessments of solid waste radioassay techniques, radwaste dose rate to curie conversions,
effluent monitoring, shutdown radiation measurements and failed fuel characterization. Mr.
Helmholz was a major contributor to the original Fuel Integrity Monitoring and Failure
Evaluation Handbook (EPRI TR-108779) as well as Revision 1 (EPRI 1003407). He currently is
working on Revision 2 of this document.
GENERAL INFORMATION
CLASS SCHEDULE: Classes will be held from 8:15 a.m. to 5:00 p.m.
Monday and Tuesday with one hour for lunch, and 8:15 to noon on Wednesday.
ENROLLMENT: Course enrollments are limited to 10. Reservations
can be made by phone 408-281-1100, fax 408-578-0790 or e-mail.
If you prefer, discuss your interests with the Program Director.
FEE: The course fee includes all course material, break
refreshments, lunches (3) and one scheduled dinner. Lodging and other meals are NOT
INCLUDED. A Certificate of Participation is provided to each participant. Please contact
NWT for current fee information.
REFUNDS AND CANCELLATIONS: If you cancel your registration at
least 3 weeks working days prior to the class start date, your fee minus a $50
administrative fee will be refunded. If you cancel less than 3 weeks prior, you
will be liable for the full fee. Unfortunately, there can be no exceptions to this policy.
Enrollment substitutions may be made at any time.
NWT Corporation reserves the right to cancel this class within two
weeks of start date if fewer than five students are enrolled.
LOCATION/LODGING: The class will be held at the NWT offices in
San Jose, California. Information on San Jose area hotels will be provided with enrollment
confirmation.
ON SITE TRAINING SESSIONS: For information about holding this
seminar at your site, employing plant specific data and system design information, please
contact the Program Director.
COMPLEMENTARY COURSES: The following NWT courses also are
intermittently offered at our San Jose offices:
PWR Operational Chemistry (4½ days)
BWR Operational Chemistry (4½ days)
Applied PWR Radiochemistry (3½ days)
Applied BWR Radiochemistry (3½ days)
These courses can be customized for specific plants and held at the
plant site or corporate office. One or two day seminars on specific subjects or directed
at specific utility personnel also can be developed.
FOR FURTHER INFORMATION PLEASE CONTACT:
Dr. S.G. Sawochka or Mr. H.R. Helmholz (Program Directors)
at (408) 281-1100, fax (408) 578-0790 or
E-Mail: Sawochka@nwtcorp.com
Helmholz@nwtcorp.com
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