ML20128D711

Requests Addl Info Listed in Encl in Preparation for Review of Proposed TS Re Steam Leak Detection Instrumentation Numac Upgrade

ML20128D711
Person / Time
Site:	Brunswick
Issue date:	11/10/1992
From:	Newberry S Office of Nuclear Reactor Regulation
To:	Adensam E Office of Nuclear Reactor Regulation
Shared Package
ML20128D666	List: ML20128D661 ML20128D711
References
NUDOCS 9212070359
Download: ML20128D711 (5)

Text

__ - . _ . _ _ _ . _ _ _ _ _ _ . . _ _ . _

g reau,  !

3"

/ o g -

n UNITED STATES 3#

i NUCLEAR REGULATORY COMMISSION l WASHINoTON. O C. 20146 o%,o l November 10, 1992

)

HEMORANDUM FOR: Elinor G. Adensam, Director I Project Directorate 11-1 Division of Reactor Projects i

FROM: Scott F. Newberry, Chief Instrumentation and Controls Branch Division of Reactor Controls and Human Factors

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION STEAM LEAK DETECTION INSTRUMENTATION NUMAC UPGRADE - BRUNSWICK STEAM ELECTRIC PLANT, UNITS 1 AND 2 On September 14, 1992, the licensee submitted for NRC staff review a

~

proposed revision to the Technical Specifications for the Brunswick Steam Electric Plant, Units 1 and 2. The staff determined that several' topics j addressing hardware and software implementathn have not been addressed adequately in this submittal, and therefore it is equested that the licensee '

provide the additional informatio.. as listed in the enclosure in preparation  :

for review of this Technical Specification amendment. Please provide a response and related documentation to these questions within C0 days.

(1,k .

Scott F. Newberry, Chie Instrumentation and Controls Branch Division of Reactor Controls and Human factors

Enclosure:

-As stated cc:

R. Lo i pf'aDMb ed*

e

-.m,_.- , , . _ . _ . . _ _ _ _ _ _ _ . _ _ _ . _ . , _ . . - - _ _ _ _ _ _ _ .

4 ENCLOSURE General Backaround Information

1. Provide design information of the GE microprocessor based NUMAC system. Include the descriptions of the devices used in the microprocessor, the programming language, compiler, type of microprocessor, etc.

2. Provide drawings and descriptions of the physical location of the replacement system in the plant. ,

3. Discuss the temperature and humidity qualifications of the NUMAC system and how these qualifications meet normal plant '

and worst case accident conditions.

Software Verification and Validation

1. Provide references / guidelines used for the NUMAC system.

2. Discuss any differences with IEEE 7.4.3.2.

3. Describe the plans for performing the verification and validation (V&V) of the NUMAC system logic. If the V&V has been performed, provide the documentation of the V&V plan.

If the V&V has not been performad, describe the process which CP&L will ensure the adequacy of the software used in the NUMAC system for 1E applications.

4. Provide the acceptance critoria for hardware and software, and also discuss traceability of products at different development stages to their specifications.

5. Provide the acceptance criteria and procedures for, and results of the hardware / software integration testing.

6. Provide the procedures and results for the startup testing..

7. Previde a listing of all software errors and_their ensuring corrections.

Operations /Surveillances

1. Describe site acceptance / pre-operatiunal testing;-

specifically ad. tress loss and restoration of power to the NUMAC system during standby and power operation. Also describe the memory-retention capability of the NUMAC system. *

2. Discuss coordination of self check and continuous monitoring modes with normal NUMAC system operations.

Page 1 of 4 i

,---...--_,-.,_--..,,._,n _. .. - . - _ , .- .~. .- .. , , < , ,: - .. . . - - - = . - -

. - ~ - - . _ - - . - _ - - . . . - . - - . _ . .- - - - - _ - . _ - . - . _ - - - - - .--

3. Describe the steps required to recover the NUMAC s ' tem if a loss of system function is detected.

4. Describe all provisions for "back-up" provision to the NUMAC system.

5. Does the system provide alarms for the loss of the NUMAC system's self-diagnostic features?

6. Discuss the potential failures for which the NUMAC system is not capable of detecting during channel functional testing.

7. Discuss the NUMAC system stability.

EMI/RFI

1. Provide the NUMAC electromagnetic compatibility (EMC) specifications and justify the margin between the EMC specifications and expected electromagnetic interference.

2. Discuss the process by which CP&L will verify that the electromagnetic environment at the plant is enveloped by the NUMAC EMC test parameterst

a. Provide a list of the test equipment used in the onsite EMI/RFI testing and their technical specifications.

b. Provide the methodology and the results of the onsite electromagnetic interference survey.

c. Provide the evaluations of the vendor's EMI/RFI testing methodology and the results of the factory testing for radiated and conducted susceptibility.

d. Provide the results of the licensee's comparison between the onsite and f actory EMI/RFI testing.

3. List the EMI/RFI testing frequencies and provide justifications for any frequencies not tested.

4. Durin., the pre-operational test, are there any transient monitors installed? If any, what are the parameters being-monitored?

5. Provide the surge transient susceptibility testing apecifications for the NUMAC system and justify the margin between the specifications and expected surges.

Man Machine Interface

1. Discuss the_ interface that the man machine interface (MMI) has with the NUMAC system.

Page 2 of 4

~ __ _____.____ ___ _ _ . _ _ . _ . __

e

2. Discuss tha process of altering setpoints through MMI or other means, i.e., password protection, administrative control, etc. ,

IE and Non-1E Isolation

1. Provide a detailed description of the devices used to '

accomplish electrical isolation between the 1E and non-1E systems and describe the specific testing performed to demonstrate that the devices are acceptable for this application.

2. Provide data to verify that the maximum credible faults applied during the tests discussed in the above question were the maximum voltage / current to which the device could be exposed, and explain how the maximum voltage / current was determined.

3. Verify that other faults were considered (i.e., open and short circuits)

4. Define the acceptance criteria for each type isolati.on device.

5. Provide the electrical wiring diagrams which show the non-1E connections to the NUMAC system.

C_onfiouration Control Describe the process for future modification to the software and hardware of the NUMAC system.

Commercial Grade Item Dedication

1. Provide the procurement documentation for the NUMAC system.

2. Provide the mean-time-to-failure (MTTF) and the mean-time-to-repair (MTTR) information for the NUMAC system.

3. Describe the audit and audit results of the vendor's QA program and procedures fcr commercial grade dedication of the NUMAC system.

4. What are the vendor's recommendation and bases for the shelf life of the_NUMAC_ spare parts?

5. Provide the standards and procedures used to dedicate the GE commercial grade NUMAC system.

6. Describe the criteria governing the successful completion of the GE commercial grade NUMAC system.

Page 3 of 4

6 i

7. Identify the methods and acceptance criteria for verifying the critica). characteristics.

Deslan basis consideration Provide the assessment and documentation on the development of the design modification with respect to the design basis.

Egwer Sunoly

1. Were the power supplies independently surge withstand tested?

2. Provide the power requirements for the NUMAC system.

3 Are switching power supplies used and what provisions are made to control harmonic distortions in the replacement system.

Failure Mode Discuss the failure mode of a loss of detector signal.

Eail Safe i Describe operation and design of any other NUMAC component uued to place the system in its fail safe condition.

Groundina

1. Are the analog and digital grounds isolated?

2. During RFI testing, was the signal on the ground line monitore Discuss the effects of the signal measured on the grounu line in relation to RFI testing.

3. Discuss the effects of lightning strike on the ground line and provisions for system protection.

EgipJ;tipt Calculations Discuss the methodology of calculating the analytical limit and allowable limit for the differential flow of the reactor water cleanup system isolation function..

Page 4 of 4

_, , . , . _ , _ . _ . . , . _