ML20132E689

Requests Addl Info Re SPDS Display Format,Operator Tasks to Acquire Display Format,Display Sys for Each Critical Safety Function,All Variables for Function Selected & Control Room Diagram Locating Display Sys within 45 Days

ML20132E689
Person / Time
Site:	Rancho Seco
Issue date:	07/16/1985
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Reinaldo Rodriguez SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
TAC-56526, NUDOCS 8508020070
Download: ML20132E689 (3)

Text

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July 16,1985

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Dock'et No. 50-312 Mr. Ronald J. Rodriguez Assistant General Manager, Nuclear Sacramento Municipal Utility District 6201 S Street P. O. Box 15830 Sacramento, California 95813

SUBJECT:

RANCHO SECO NUCLEAR GENERATING STATION - SAFErY PARAMETER DISPLAY SYSTEM (SPDS)

In the enclosures to our letter dated July 27, 1984, we identified eight parameters that did not appear to be proposed for inclusion in your SPDS.

These parameters were: (1) intermediate range neutron flux, (2) power range neutron flux (3) containment sump level, (4) containment hydrogen concentration, (6) subcooling monitor, (6) reactor coolant system (RCS) level, (7) stack r,adiatinn monitor, and (8) steamline radiation monitor.

In your October 2, 1984 response to our letter, you stated that the first five parameters listed are included in the SPDS. You further noted that in your September 14, 1984 submittal on your Regulatory Guide 1.97 Position Revision 1 you committed to add this 1arameter to the SPDS. In addition, you identified that functions of the stac( and steamline radiation monitors are accomplished by variables in the Digital Radiation Monitoring System (DRMS) which are displayed on the Interim Data Acquisition and Olsplay System (IDADS)ComputerSystem.

Therefore, we now find the list of variables for the Rancho Seco SPDS acceptabic.

However, from our review of your October 2,1984 submittal we noted a potential human factors problem which could not be evaluated because of inadequate information. It appears that the data needed to evaluate the critical safety functions are presented in several display formats and in two display systems. The location of each display system within the control room has not been defined. We are concerned with the issue of dispersed data between the display systems and among the various display formats. If the data are widely spread in the control room, and widely spread among the display fonnats within a dis) lay system, then control room operators will not be able to rapidly and rella)1e assess the safety status of the plant.

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'Mr." Ronald J. Rodriguez In order to complete our review of this item please provide the following

-information. 1) Define the display format, operator tasks to acquire the display format, and display system for each critical safety function and all variables for the function selected by you to meet the requirements for the SPDS, and 2) Provide a plot plan of the control room indicating the location of each display system used to eet the SPDS requirements. Please provide the requested infomation within 45 days of receipt of this . letter.

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

Sincerely,

• M M useumg W!* Ba4%.e John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing cc: See next page D111 b gg[1184 et Fils/ TION JPartlow NRC PDR ACRS-10 L PDR R!ngram OR0f4 Rdg SMiner HThompson Gray File OELD ER1ackwood EJordan H0rnstein BGrimes ORR#4 DL DRM Dl.

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I. Mr. R. J. Rodriguez Rancho Seco Nuclear Generating l Sacramento Municipal Utility District Station

r. David S. Kaplan, Secretary Sacramenta County and General Counsel Board of Supervisors .

Sacramento Municipal Utility 827 7th Street Room 424 District Sacramento, California 95814 6201 S Street P. O. Box 15830 Ms. Helen Hubbard Sacramento, California 95813 P. O. Box 63 Sunol, California 94586 Thomas Baxter, Esq.

Shaw, Pittman, Potts & Trowbridge 1800 M Street, N.W.

Washington, D.C. 20036 Mr. Robert 8. Borsum S Babcock & Wilcox Nuclear Power Generation Division Suite 220, 7910 Woodmont Avenue Bethesda, Maryland 20814 Resident Inspector / Rancho Seco c/o U. S. N. R. C.

14410 Twin Cities Road Herald, California 95638 Re U.gional Administrator, S. Nuclear RegulatoryRegion V Comission 1450 Maria Lane, Suite 210 '

Walnut Creek, California 94596 Director Energy Facilities Siting Division Energy Resources Conservation &

Development Comission 1516 - 9th Street l Sacramento, California 95814 Mr. Joseph 0. Ward, Chief i Radiological Health Branch '

State Department of Health Services 714 P Street Office Building #8 Sacramento,dalifornia 95814 Mr. Joseph Findaro California State Office 444 North Capitol Street, N.W., Suite 305 Washington,D.C. 20003

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