ML20064M967

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Forwards Crbr Action Plan to Resolve Questions Re Monitoring Component Degradation in Nsss.Discussion Re Results of Phase I of Action Plan Scheduled for Late Nov 1982
ML20064M967
Person / Time
Site: Clinch River
Issue date: 09/01/1982
From: Longenecker J
ENERGY, DEPT. OF, CLINCH RIVER BREEDER REACTOR PLANT
To: Check P
Office of Nuclear Reactor Regulation
References
HQ:S:82:089, HQ:S:82:89, NUDOCS 8209080176
Download: ML20064M967 (7)
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Department of Energy Washington, D.C. 20545 Docket No. 50-537 HQ:S:82:089 SEP 011992 5J "O9 4

Mr. Paul S. Check, Director CRBR Program Office Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Check:

ACTION PLAN RELATING TO MONITORING 0F COMP 0NENT DEGRADATION IN THE NSSS Enclosed with this letter is a CRBRP Action Plan to resolve questions relating to monitoring component degradation in the nuclear steam supply systems.

This action plan is being submitted to summarize planned activities which were first discussed with your staff in a meeting on February 24, 1982. As detailed in the enclosed plan, the Project will complete Phase I of the action plan and will be available to discuss the results with your staff in late November 1982.

Sincerely, Jo n R. Longenec er Acting Director, Office of the Clinch River Breeder Reactor Plant Project Office of Nuclear Energy Enclosure cc: Service List Standard Distribution Licensing Distribution 8209080176 820901 pOO(

PDR ADOCK 05000537 A PDR

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.' t Attachment 1 CRBRP ACTION PL AN FOR RESOLUTION OF QUESTIONS RELATING TO K)NITORING OF COMFONENT DEGRADATION IN NSSS _

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INTRODUCTION The purpose of this document is to provide the action plan for evaluntion and resolution of questions relating to montforIng of component degradation in NSSS systems.

I1. BACKGROUND Recent operational events experienced in the Light Water Reactor flei d have hig51 Ighted the importance of providing the capability to moniter speelfIc areas of concern f or component or subsystem degradation.

Based on the type of reactor plant design, these capabilities may const st of specific dest gn f eatures and/or spectal diagnostic Instrumentation to be used as aides in the detection of component and/or subsystem degradation. The primary objective of degradation monitoring is to ensure that detection wilI take place in time to l prevent such degredation f rom resulting in the f ail ure of the component or systes to perf orm its saf ety f unction.

In addition, a review of technical questions and comments provided by NRC on CRBRP briefIr.gs and presentations f urther enphasized the need for an action plan addressing requirenents, capabilities, and impacts ,

to be devel oped.

Ii1. SCOPE in recognition of the complexity and diversity of questions to be r esol ved, it is recommended that the action plan be conducted in two phases:

l o Phase 1 -

Development of the basis f or CRBRP component degradation moniterIng o Phase 11 - Identification of the requirenents and imple-mentation needed to support the basis A. PHASE I SCOPE l

NSSS systens to be eval uated I,n Phase 1 Scope shall consist of I those in the heat generating and main Heat Transport Systems and l

shall also include those systems invol ved in Reactcr Coolant l Makeup, Decay Heat Renovel, and Spent Fuel Storage.

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. . Attachment I to

. LAP-82-371 The Phase l evaluation should be related to the specific CRBRP design; however, LWR incident data, supplied in Attachment 4, should be eval uated. The Phase I results will be used to make a recommen-dation as to whether Phase 11 will be required.

Overal l, the objective it to demonstrate a l evel of saf ety mmparabl e to current LWRs with respect to degradation mechanisms within the

. primary boundary or other key saf ety rel ateo systems.

Phase i should make the f ollowing assessments:

Task 1 (a) Loose Parts (1) Potential ef fects of loose parts - assess ef fects of loose parts entering the component from the fluid system or generated internally to the component. Part sizes entering the component shall be based on the loose parts transport capability study of Task 2.

(2) Potential generation of loose parts - Identify fail ures of the components that could create loose parts and release them to the system and the impact on the component itsel f.

(b) Crud Similer to above for Ioose parts, but spect fIcally covering crud. Crud is def ined as corrosion, rust, oxides and wear I

generated material which can collect or build up over time in crevices and on component and/or heat transfer surf aces .

(c) Vibrati on Assess the vibration potential of each canponent and the basis f or the estimates, expected magnitude of impacting, maximum impact energy, current plant monitoring plans including plant surveillance plans, feasible means f or monitoring, potential for identifying a vibration Induced f ailure in the plant, etc.

These assessments should provide a basis f or detennining sensitivity of the component to loose parts, crud and vibration; the potential for creating loose parts and crud; current ability to detect a problem; ability to inspect the component, and the designer's judgnent of instrumentation modifications or additions that would enhance detection of a probl em.

The objective of these assessments"woul d be twofoi d:

(1) Provide a data base f or presenting a case to NRC on a l ow likel ihood of a saf ety problen f ran loose parts, crud or v i br ati on.

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2. Identify the more significant potential problems f rom loose, t parts, crud and vibration f or assessment of detection capability based on the Instrument survey of Task 3. i

- I Task 2 1 Develonment of Fluid Velocity Distribution and ionse Parts Trantnort  :

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Fansib'llity  ?

- 1 For each system such as the PHTS Identify the fluid velocities ,

throughout the system. Develop parts mobility curves for a range of 3 to 6 part densities and shapes. These curves would relate parts ize to the sodium velocity required to carry the parts with the l fluid. The sodium velocities and mobliIty curves would be used to Identify the range of parts and potential sources that could enter [

each component for the assessments of Task 1. t i,

Task 3 instrumentation Survav Identify typical detection thresholds, accuracy, capability for l

Interpretation of measurenent signals, temperature limits, lifetime,  ;

etc., for potential monitoring devices usef ul for detection of loose ,

parts, crud, and vibration or the of facts of these items. Evaluate existing instrumentation and identify where these Instruments do and do not satisfy the monitoring requirements.  ;

In perf orming the above three tasks, the following questions should be considered:

o What are the saf ety requirements?

o What types of degradation are of concern? Some candidates include vibration, loose parts, flow blockage, wear of f act, etc. ,

o What is the impact of degradation on saf e operation and  !

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shutdown?  !

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o What design f eatures exist to prevent or mitigate i degradationt '

o What can be gained by modifying existing instrumentation?

i o What can be gained f rom specific monitoring activities of j existing instruments? I o What is the susceptlbilIty,of system degradation from I construction and pre-op test abnormal occurrences? I I

F o What is the susceptibility of degradation for CRBRP systems analogous to Lignt Water Reactor Plant?  !

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l o Does present design characteristics Inhibit component degradation montcrIng?

o What is the potential for CRUD generation and deposition on heat transf er surf aces; what are the heat transfer ef f acts on key components and subsystems?

Maximum use should be made in perf orming the above assessements of existing data bases using the FMEA, BOP, PRA, inservice inspection, and Surveillance data bases as appropriate.

SUMARY Phase I of the progran should accomplish the following:

1. Establishment of what data needs to be obtained in order to assure that we meet saf ety goals comparable to LWRs and what additional benef it could be obtained with respect to enhancing plant availability, operability and maintainability (i.e.,

review LWR noise diagnostic experience and approach applica-bility to CRBRP).

2. Determine how to obtain the necessary data, e.g. :
a. Judicious use or enhancement of existing process sensors and instrumentation (i.e., noise analysis, etc.).
b. Use of Inservice Inspection Progran, (i.e. pump vibratt on data, S.G. acoustic Ieak detection data, etc.)
c. Addition of "new instrumentation (i.e., an LPMA and/or LPMS).

B. PHASE II SCX)PE The fof lowing are const dered key elements of Phase 1I to be spect f Ically addressed:

1. Requirements o Determirfation of spect f Ic montforIng requirenents for .

for components desned necessary to be monitored.

o identification of design changes (if any) needed to support specific monitoring requirenants.

2. Criterion ,

From an in-depth study of CRBRP systen dest gn and oper-ational limits, determine appropriate criterion for the requirenants identified above in B.1.

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Determine characterization capabilities and expected . ,

1Ifetime degradation trends for support of the eriterton developed f or those CRBRP systems both unique and analogous to Light Water Plants. ,

3. Methodology.and implementation to Meet Criterion "o Determination of the specific type of monitarIng and diagnostic methods and/or instrumentation needed, such as vIbratlon sonsing, acoustIca1 notse detection, process sensor, neutron f lux measurenants for noise detection, and loose parts monitoring to meet the specific monitoring requirenent.

o Evaluation of the present diagnostic Instrumen-tation systems utilized in the Light Water Reactor field to determine their capability of providing reliable information for unique criterion in an LMFBR enyIronment, o Development of an implementation progran through periodic survelllance, utilizing an Integrated diagnostic Instrumentation system encompassing eienents of vIbratlon, acoustic sonsing, notse monitoring and in-plant instruments.

o identification of the implementation impacts (if any) on present system design.

o Determine the necessary methods of processing the data and the frequency of data taking required.

o Determine whether a distributed or centralized system should be used for data taking and analysis.

o Build a base of " noise signature and diaspostic data from the LWR Industry, domestic LMFBRs and foreign exchanges.

4. State of the Art Development Requirenents for CRBRP i

o Develop a plen of research and special tests as -

required to resolve incompatibllIties and a rev few cf of f-the-shel f instrumentation to meet special requirenents of CRBRP.

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