ML17301A051

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Forwards Response to 830609 & 10 Requests for Addl Info Re NUREG-0737,Items II.F.4,5,6,SAS Computer Scan Rates & Hydrogen Monitoring Sys
ML17301A051
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 08/08/1983
From: Robert E. Uhrig
FLORIDA POWER & LIGHT CO.
To: Clark R
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM L-83-439, NUDOCS 8308150207
Download: ML17301A051 (3)


Text

P OX 14000, JUNO BEACH, FL 33408

~yVll/g FLORIDA POWER 5 LIGHT COMPANY August 8, l 983 L-83-439 Office of Nuclear Reactor Regulation Attention: Mr. Robert A. Clark, Chief Operating Reactors Branch 7/3 Division of Licensing U. S. Nuclear Regulatory Commission V/ashington, D. C. 20555

Dear Mr. Clark:

Re: Sf. Lucie Unit l Docket No. 50-335

~eceyest for Additional Information The attachment to this letter provides Florida Power & Light Company's responses to questions, asked by your staff during telephone conversations on June 9th-and lOth, l983.

Very truly yours, Robert E. Uhrig Vice President Advanced Systems and Technology REU/R JS/cab Attachment pd r

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8308i50207 830808 ADQCK'05000335 PDR PEOPLE... SERVING PEOPLE

Attachment Containment Pressure - II.F. I.4 Question: NRC asked if the strip chart recorder can be switched to Train B if Train A fails.

~Res onse: The chart recorder PR-07-8A can not be switched from Safety Train A to safety Train B. NUREG 0737 requires that Regulatory Guide I.97 Rev. 2 be followed for design and qualification criteria. Containment Pressure is listed as a Category I variable. Our interpretation of RG l.97 Rev. 2 is that recording for at. least one train is all that is required. FPL meets this recording requirement.

Containment Sum Monitor - I I.F. I .5 Question: NRC asked if there is only one train for monitoring sump level.

~Res onse: There is only one train for monitoring sump level. NUREG 0737 requires that a narrow range instrument be provided to cover the range from the bottom to the top of the Containrnenf Sump, and references RG l.97 Rev. 2 for the design and qualification criteria. Sump level has

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been classified as a Cat. 2 variable in RG 1.97 Rev. 2 and does not require redundancy. However, there is also a Containment Water Level Wide range monitor.

Containment H dro en- II.F.Ie6 Question: NRC asked what accuracy level was being claimed for the containment hydrogen monitor.

~Res onse: Comsip Delphi, the equipment manufacturer, claims that the hydrogen analyzer can be calibrated with + 2% accuracy over the full scale.

Therefore, we take credit for + 2%. However, our experience shows that an accuracy of + l% is achievable as demonstrated by the following data from a previous calibration.

Hydrogen Instrument Reading Concentration Control Room Local 2.9 I 2.9 I 2.8 I 4.53 4.50 4.45 Question: NRC asked whether or not the hydrogen monitor solenoid valves are controllable from the control room.

~Res onse: The solenoid valves are controllable from the control room.

General Questions Question: NRC asked what the SAS computer scan rates are for the different parameters.

~Res onse: The scan rates are as follows:

Containment Pressure Narrow and Mid-Range 4 seconds Wide Range I second Containment Sump Level I second Contaiment Water Level 16 seconds Containment Hydrogen 16 seconds Question: NRC asked if the plant operator can direct the SAS computer to keep a record of the data most recently scanned.

~Res onse: The SAS computer maintains a record of the data scanned over the previous 30 minutes. The SAS computer also has the capability to maintain a record of the data scanned over a period of time in excess of 30 minutes.

Question: NRC asked if, the SAS computer can present an analog display oi the last 30 minutes on a CRT located in the control room.

~Res onse: The SAS computer can present an analog display of the last 30 minutes on a CRT located in the control room.

Question: NRC asked if the SAS computer can print a hard copy of the display described above on a 'color plotter.

~Res onse: The SAS computer can print a hard copy on a color plotter of the display described above.

Question: NRC asked how often the hydrogen monitoring system is calibrated.

~Res onse: The hydrogen monitoring system is normally calibrated every three months.

Question: NRC asked if the SAS computer has trending capability.

~Res onse: Containment Pressure, Containment Sump Level, and Containment Hydrogen are all included in the SAS computer trend group.