ML19257C533

Forwards Response to 791227 Ltr Requesting Info Re Mods to Small Break LOCA Operator Guidelines.Emergency Operating Guidelines Revised to Incorporate 43 F Subcooling Margin. Supporting Data Encl

ML19257C533
Person / Time
Site:	Farley
Issue date:	01/22/1980
From:	Clayton F ALABAMA POWER CO.
To:	Ross D Office of Nuclear Reactor Regulation
References
NUDOCS 8001290354
Download: ML19257C533 (4)

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• Alabama Power C i ompany 600 North 18th Struet Post Offree Box 2641 Birmingham, Alabama 35291 Telephone 205 323-5141 JL.k L';;oPvi,7,";ffnt AlabamaPower

!?W SOuttwn elxtr'C Spiem January 22, 1980 Docket Nos. 50-348 and 50-364 Mr. D. F. Ross, Jr., Acting Director Division of Project Management Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Ross:

As requested in your letter dated December 27, 1979 concerning Modi-fications of Small-Break Loss-Of-Coolant Accident Operator Guidelines, Alabama Power Company submits the enclosed response.

If you have any further questions in this matter, please advise.

Yours very truly, A

F. L. Clayton, Jr.

FLCJr/HRF:bhj Enclosure cc: Mr. R. A. Thomas Mr. G. F. Trowbridge

$6 \

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8001290

e LNCLOSURE Emergency Operating Procedures have been revised to incorporate the require-ment for ensuring at least a 430F subcooling margin (normal full. power sub-cooling) before terminating safety injection. This is in accordance with the Small-Break Loss-of-Coolant Accident Operator Guidelines approved by NRC by your letter to Mr. Cordell Reed, dated November 5, 1979.

Currently, the non-LOCA transients and E01's are being reviewed for the pur-poses of incorporating a subcooling criterion in the HPI termination criteria.

These activities will be completed and transmitted to the NRC by the Owner's Group chairman within the 21 day requirement.

Derivation of instrument irors associated with measurement of RCS pressure and temperature for ensuring adequate core subcooling is given below.

Pressure RCS wide range pressure is measured by ITT Barton, Model 763 pressure trans-mitters. Qualification of the transmitters are documented in the Westinghouse document entitled " Qualification Testing of Barton Pressure and Differential Pressure Transmitters" transmitted to Mr. J. F. Stolz on September 29, 1978.

The following describes errors in indicated pressure as a result of normal and post-accident environment:

NOTE: Wide range span 3000 psig 1

Normal transmitter reference accuracy = 10.5% of span

= 15 psi Ambient temperature effects on trans- = +0.5% of span mitter2 = Il5 psi Maximum transmitt er drif t2 = 11.0% of span

= 130 psi Normal instrument accuracy 2 = 0.5% of span

= 15 psi Ambient tem erature effect on = 10.5% of span instrument = 215 psi Maximum instrument drift 2 = 1.0% of span

= 230 psi Normal indicator accuracy = 11.5% of span

= 245 psi 0

Calibration devices accuracy = 10.1% of scale

= 3 psi 182y129

Allowed calibration tolerances 5 = 0.5% of span

= 15 osi Maximum indicator reading error =kc smallest division

= of 50 psi

= 12.5 psi Maximum Normal Error = 1 d5 (15)2+2 (30)2+(45)2+(12.5)2

= 71.5 psi Maximum post-accident environmental = +2% of span effect7 = I60 psi

( 1600F and 8 psig steam)

Total indicated error =

1132 psig Temperature RCS wide range temperature is measured by Rosemount Model 176RS RTDs. Quali-fication of these RTDs are documented in Westinghouse WCAP 9157. The follow-ing describes errors in indicated temperature as a result of normal environ-ment. Post-accident environmental effects are negligible.

NOTE: Span 700 F Process measurement error = 3.0% of span

= !210F Normal instrument error = !0.5% of span

= 3.5 F Ambient temperature effect on = 0.5% of span instrument 2 = 23.50F Maximum instrument drift = tl.0% of span

= 7.00F Normal indicator accuracy = 0.5% of span

= 3.50F Calibration curve accuracy = 10.2 F Accuracy of calibration devices = 10.01% of span

= .070F Allowed calibration accuracy = t0.1% of span

= 0.70F Calibration error due to non-linearity = 0.5% of span

= 3.SOF

_2_ 182// 130

4 Maximum indicator reading error = k of smallest division

= k of 100F

= 2.SoF Maximum Error = t 4(3.5) +(2.5) (21) +(7) +(.2) +(.7) +(.07)

= 23.4 F NOTES (1) ITT Barton Model 763 technical manual.

(2) Dick Miller, Engineer - Westinghouse I&C (3) Westinghouse Process Instrumentation Accuracy Requirements and Guidelines (4) FNP Test Equipment Inventory Description (5) Applicable Surveillance Test Procedures (FNP)

(6) Main Control Board Instrumentation (7) Westinghouse Report " Qualification Testing of Barton Pressure and Differential Pressure Transmitters" (Submitted to NRC 9/29/78 by letter from T. M. Anderson to J. F. Stolz) extrapolated to 160 F and 8 psig per Dick Miller, Westinghouse I&C.

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