ML20137X639

Forwards Request for Addl Info Re Proposed Inadequate Core Cooling Instrumentation,Identified as Open Item 3 in Oct 1985 Ser.Info Requested in Sufficient Time to Complete Review Prior to Fuel Load

ML20137X639
Person / Time
Site:	Beaver Valley
Issue date:	03/03/1986
From:	Tam P Office of Nuclear Reactor Regulation
To:	Carey J DUQUESNE LIGHT CO.
References
TAC-62872, NUDOCS 8603110481
Download: ML20137X639 (3)

Text

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March 3,.1986 Docket No. 50-412 DISTRIBUTION: l 2 Docket No;.50-4121

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PTam NRC PDR LRubenstein Mr. J. J. Carey, Vice President Local PDR CVogan Duquesne Light Company PAD #2 R/F ACRS (10)  !

Nuclear Group TNovak Tech. Branch i Post.0ffice Box 4 OELD Gray File l Shippingport, PA 15077 EJordan .RKarsch l BGrimes '

Dear Mr. Carey:

JPartlow

Subject:

Beaver Valley Unit 2 - Request for Additional Infonnation on Inadequate Core Cooling (ICC)

Our evaluation of your ICC instrumentation has been documented in the October 1985 Safety Evaluation Report. It is also identified as an open item (Item No. 3) that would _need additional information from Duquesne Light.

. Enclosed are seven questions that we believe should provide some guidelines in addressing the subject open iten. You should submit your response on a schedule that would allow the staff ample time to complete its review prior to fuel load. j Sincerely, j Peter S. Tan, Project Manager PWR Project Directorate #2 Division of PWR Licensing-A l Office of Nuclear Reactor Regulation j

Enclosure:

As stated cc: See next page 1

PM: PAD #2 0 !

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• Mr. J. J. Carey Duquesne Light Company Beaver Valley 2 Power Station cc:

Gerald Charnoff, Esq. Mr. Roger Martin, Manager Jay E. Silberg, Esq. Regulatory Affairs Shaw, Pittman, Potts & Trowbridge Beaver Valley Two Project 1800 M Street, N.W. Duquesne Light Company, P.O. Box 328 Washington, DC 20036 Shippingport, PA 15077 Mr. C. W. Ewing, Quality Assurance Director, Pennsylvania Emargency Manager Management Agency Quality Assurance Department Room B-151 Duquesne Light Company Transportation & Safety Building P.O. Box 186 Harrisburg, Pennsylvania 17120 Shippingport, Pennsylvania 15077 Mr. Thomas Gerusky Mr. E. J. Woolever, Vice President Bureau of Radiation Protection Special Nuclear Projects PA Department of Environmental Duquesne Light Company Resources P.O. Box 4 P.O. Box 2063 Shippingport, Pennsylvania 15077 Harrisburg, Pennsylvania 17120 Mr. T. J. Lex BVPS-2 Records Management Supervisor Westinghouse Electric Corporation Duquesne Light Company Power Systems Post Office Box 4 P.O. Box 355 Shippingport, Pennsylvania 15077 Pittsburgh, Pennsylvania 15230 John A. Lee, Esq.

Mr. P. RaySircar Duquesne Light Company Stone & Webster Engineering Corporation 1 0xford Centre P.O. Box 2325 301 Grant Street Boston, Massachusetts 02107 Pittsburgh, Pennsylvania 15279 Mr. Glenn Walton U.S. NRC .,

P.O. Box 181-Shippingport, Pennsylvania 15077 Mr. Thomas E. Murley, Regional Admin.

U.S. NRC, Region !

631 Park Avenue King of Prussia, Pennsylvania 15229 Mr. John P. Thomas, Manager Engineering Beaver Valley Two Project Duquesne Light Company P.O. Box 328 Shippingport, Pennsylvania 15077

ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION ON THE DUQUESNE LIGHT COMPANY PROPOSED INADEQUATE CORE COOLING INSTRUMENTATION FOR THE BEAVER VALLEY-UNIT 2 PLANT

1. Knowing that the CET accuracy may not be suitable for the calculation of the core subcooling margin, the applicant should justify the use of the CET signal as the only input to the RPU for the core subcooling margin.

Please address the status of the CET environmental qualification.

2. Describe any' modifications or deviation from the Westinghouse Owner's Group Emergency Response Guidelines in the process of developing the Beaver Valley-2 Emergency Operating Procedures due to the uncertainty of the core exit thennocouple readings. .

The following are clarification questions on the description of the Beaver Valley-2 ICC system in letter, J.J. Carey to G. Knighton, 5/31/85:

3. Is the portion of the core exit thermocouple cabling inside the contain-ment environmentally qualified?

4. The description of the subcooling margin monitor signal processing electronics is not clear : are there two or three RPUs? In particular RPU-! is not shown to receive a signal from the reference junction boxes. Please clarify.

5. In the RVLIS Figure V, it is not clear where the inputs to DPU A and DPU B are coming from. Please clarify.

6. In the description of the RVLIS monitoring system there is a High Volume Pressure Sensor; however, there is no indication of the purpose or use of this sensor signal. Please describe.

7. What version of the WOG emergency response guidelines has Beaver Valley adopted; i.e., Rev. O, 1, or 27