ML20054H281

Forwards Request for Addl Info Re Proposed Reactor Vessel Water Level Indication Sys.Info Should Be Submitted within 30 Days of Receipt of Ltr

ML20054H281
Person / Time
Site:	Point Beach
Issue date:	06/14/1982
From:	Clark R Office of Nuclear Reactor Regulation
To:	Fay C WISCONSIN ELECTRIC POWER CO.
References
NUDOCS 8206230187
Download: ML20054H281 (5)

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• JUN 141%I DISTRIBUTION:

vD'ocket File NRC PDR

. Local PDR.

Docket flos. 50-266 D. Eisenhut and.150-301 0 ELD OI&E (1)

T. Colburn

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!!r. C.11. Fay NSIC ' ' '

Assistant Vice President . ACRS (10) tlisconsin Electric Power Company J. Heltemes, AE00 231 West 141chigan Street .

f411waukee, llisconsin 53201

Dear Mr. Fay:

In.conductingourreviewofyobrOctober2b,1981sb'mittalregarding b your proposed Reactor Vessel tlater Level. Indication System for the Point Beach fluclear Plant, Units 1 and 2, we have determined that we will need the additional information identified in the enclosure to continue our review.

Inorder.forustomaintainourreviewschedble,yourresponseisrequested within 30 days receipt of this letter. Picase contact us if you have any questions concerning our request.

The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, Of'B clearance is not required under P.L.96-511.

Sincerely.

Original signed by 6%%.> D %a@%$_y(

Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing

Enclosure:

Reqdest for Additional Information cc: See next page 8206230187 820614 PDR ADDCK 05000266 P PDR r

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Wisconsin Electric Power Company cc:

Mr. Bruce Churchill, Esquire Mr. William Guldemond Shaw, Pittman, Potts and Trowb. idge USNRC Resident Inspeccurs Office 1800 M Street, N. W. 6612 Nuclear Road Washington, D. C. 20036 Two Rivers, Wisconsin 54241 Joseph Mann Library 1516 Sixteenth Street Two Rivers, Wisconsin 54241 -

Mr. Glenn A. Reed, Manager Nuclear Operations Wisconsin Electric Power Company

Point Beach Nuclear Plant 6610 Nuclear Road Two Rivers, Wisconsin 54241 Mr. Gordon Blaha i

Town Chairman Town of Two Creeks Route 3 .

Two Rivers, Wisconsin 54241 Ms. Kathleen M. Falk General Counsel Wisconsin's Environmental Decade 114 N. Carroll Street Madison, Wisconsin 53703 .

U. S. Environmental Protection Agency Federai Activities Branch Region V Office ATTN: Regional Radiation Representative 2 230 S. Dearborn Street-__

Chicago, Illinois 60604 Chairman

[ Public Service Commission of Wisconsin Hills Farms State Office Building Madison, Wisconsin 53702 Regional Administrator l Nuclear Regulatory Commission, Region III

Office of Executive Director for Operations i

799 Roosevelt Road Glen Ellyn, Illinois 60137 1

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REQUEST FOR ADDITIONAL INFORMATION ON REACTOR VESSEL WATER LEVEL INDICATION SYSTEM FOR POINT BEACH NUCLEAR PLANT UNITS 1 AND 2

1. According to your submittal dated October 20, 1981 and responses to questions to Westinghouse submittal (your attachment #2) (specifically resporites to question numbers 12, 21, 22, and 23), your system is substantially different from the Westinghouse system. Provide a detailed description with respect to the itemized documentation requirements per NUREG-0737, Item II.F.2.

2. Since your system is different from tne Westinghouse system, the development of this level measurement system should include a test program to verify how the system . arks. Provide information about what to observe? When will this data be available?

3. Provide an analysis of system accuracy, listing the separate contri-butions from each component and how they are combined for the estimate of the total system accuracy.

4. Your response to Question 7 indicated that your level measurement instrumentation will not be used for the operator to make decisions to initiate action to recover the plant from the accident and prevent damage to the core. What then is the basis for operator decisions?

Please relate your responses to various size breaks.

5. Your response to Question 8 indicates expected response time of fractions of a second. Show a calculation of the expected response time using typical line diameters, lengths and differential pressure transmitter volumetric displacement for given pressure change. This response time should be measured and reported as a response to this question (using the specific transmitter, line diameters and line lengths). What is the required response time for your system?

6. Your response to Question 11 indicates that overranging "is not expected" to affect d/p transmitter performance. This question should be answered with data from test programs or past performance (well documented) for the specific transmitter type intended for this system. Provide the basis for "is not expected".

7. Provide your expected error range for your temperature and pressure compensation of differential pressure measurements. Describe how this error range will be factored into system operation.

8. Please answer Question 15, what is the source of the tables or relationships used to calculate density corrections for the level system?

9. What are the provisions to insure that the impulse lines remain full?

i How can an empty line be detected? What are the corrective actions?

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! 10. In addition to your response to Question 20 indicating that the RVWLS will have an ambiguous response describe under what conditions would the response be ambiguous? What operating procedures are provided to alert operator of possible ambiguous indications.

11. Your response to Question 23 is inadequate. How does your system respond to voids in the vessel? What tests are to be run or have been i

run under these conditions?

12. Provide an analysis in response to Question 24 dealing with expected i accuracy after an ICC event.

13. Justify that the single computer for level calculation meets the 99%

availability requirement of NUREG-0737.

14. Justify that the location of your pressure transmitters inside the containment will provide satisfactory operation during transients which degrade containment environment. Describe how this impacts

the maintenance, calibration, or replacement of the transmitters'and ,

their ability to continue to provide reliable information when containment access is not possible.

15. In your response to Question 3, you describe calibration and testing of the electronic modules. What provisions will be provided for calibration and testing of the differential pressure transmitters?

16. What effect will ambient conditions.inside containment (i.e., temperature) have on the RVWLS response?

17. In your system description you refer to " weighted average temperature signals" on Page 5 second paragraph. Please define this term.

18. In your equation on Page 6 you assume constant temperature, pressure and density through the vessel for your calculations. We know that these parameters vary, please justify your assumptions.

19. Your design uses one line each for the high pressure side and low pressure side; these two lines are connected to four differential pressure transmitters. Please indicate line lenghts, line diameters (inside and outside) and routing. A single line leak or break would make inoperable all four d/p transmitters. Please explain how this design satisfies the single failure requirement of NUREG-0737.

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