ML20010E612

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Submits Plans for Compliance W/Conclusions of NRC Safety Evaluation Re Reactor Pressure Vessel Water Level Ref Point. Photographs Encl
ML20010E612
Person / Time
Site: Hatch  Southern Nuclear icon.png
Issue date: 08/28/1981
From: Beckham J
GEORGIA POWER CO.
To:
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.27, TASK-TM TAC-45787, TAC-45788, NUDOCS 8109080043
Download: ML20010E612 (13)


Text

I

  • Geuma Power Company
  • 333 Pi. Mmc;rd A moue
  • AtWM Gccrg a 303C8 T.', phonc 404 52F,-7020 Ma+ng Add 2s'.

Post Ottee f30< 45E Aranta. Gerg a 303J2 August 28, 1981 J. T. Beckham, Jr.

V>ce Pres kot aN GeNra; Marayr .I'O. b Nucear Gent ranon '%

N s 9/ '

Director of Nuclear Reactor Regulation 5

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U. S. Nuclear Regulatory Commission 8) .

J M Washington, D. C. 20555 f;N J NRC DOCKETS 50-321, 50-366 V ch ,,[ U OPERATING LICENSES DPR-57, NPF-5 W .d D

EDWIN 1. HATCH NUCLEAR PLANT UNITS 1, COMMON WATER LEVEL REFERENCE - II.K.3.27 m gI'h GENTLEMEN:

A generic report entitled " Common Water Reference," transmitted as Enclosure 13 to our December 31, 1980 letter, proposed that a Reactor Pressure Vesse'. (RPV) level indication system, as was then installed at Plant Hatch, adequately addressed the ;oncern stated in item II.K.3.27 of NUREG-0737. By an April 6, 1981 letter, Darrell G. Eisenhut advised the members of the BWR Owners Group that the NRC staff had concluded that the generic report did not justify that reference level design. Our June 9, 1981 letter proposed a revised design employing dual scales to addrest the concerns of human factors engineering. Through telephone conversations with Mr. Morton B. Fairtile, NRC Project Manager for Plant Hatch, and members of the NRC technical staff, it was disclosed that the revised design as proposed by our June 9, 1981 letter was acceptable only as an interim solution to the concerns of item II.K.3.27. Further, it was stated that it was the conclusion of the Safety Evaluation performed by the NRC staff that only a single reference point for all level instrumentation would adequately address the requirements of NUREG-0737. While we still believe that the original design as described in the generic report is fully adequate, we herein submit our plans to comply with the conclusions of that Safety Evaluation on the question of RPV water level reference point.

The scales on indicators and recorders which were previously refereaced to the vessel bottom head invert will be revised to reference " Instrument Zero." These are the fuel zone instruments and the shutdown range instruments. Attached are photographs and drawings illustrating the instruments' present location and appearance. After revision, the scales of instruments 2B21-R605, 2B21-R610, 2 B21-R615 and 2B21-R623A, B (similar 11strumentation on Unit 1 with the exception of 2B21-R623) will be altered to reflect the common reference point- ' Instrument Zero" at 517 inches above the vessel bottom head invert. Spacing of marks and numbers will remain the same with the value of the numbers changed to reflect the new instrument reference zero, with the exception of the scale on 2B21-R615 on Unit 2, which will be marked at 5 inch increments vice 3 inch in accordance with the NRC's evaluation. c/ [,

2

, Jia.s 0109080043 810828 M I* O PDR ADOCK 05000321 P pyg b f

Georgia Power d United States Nuclear Regulatory Commission Wr.shington, D. C.

August 28, 1981 Page Two Various operating and calibration procedures will be revised to correct any specific numbers referenced to reflect the change in reference point.

The estimated date of completion of these revisions of scales, procedures, and operator training is March 1, 1982. It is our belief, as supported by the expressed opinion of the NRC staff, that the present system of indication is adequate during the interim six-month period.

If you require further information, please contact us.

Yours very truly, b b J. T. Beckham, Jr.

/

WEB /mb Enclosure xc: M. Manry R. F. Rogers, III i

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Georgia Power d riste 1 REVISED UNIT 2 INSTRUMENTATION INSTRUMENT SEE ATTACHED l NUMBER RANGE SCALE INCREMENTS FIGURE NUMBER 2C32-R606A,B,C 0"-60" Mark-every inch with numbers 1,2,3 Panal 603 at 10 inch increments 2B21-R604A,B -150" to 60" Mark and number every 15 inches 1,3 Panel 603 2C32-R608 0"~to 60" Mark every inch with numbers 2,3 Panel 603 Recorder at 10 inch increments 2B21-R605 -17" to +383" Mark every 10 inches with numbers 4,5 Panel 602 at 100 inch increments 2B21-Rb10 -317" to -17" Mark with number every 30 inches 6 Panal 601 4

2B21-R615 -317" to -17" Mark every 5 inches with numbers 6 Panal 601 Recorder at 50 inch increments i

2B21-R623A,B* -150" to 60" Mark every 5 inches uith numbers 6,7 Panel 601 Recorder at 50 inch increments. Recorder payer scale is 0-100 inches i

  • No Unit 1 instrument like this - otherwise instrumentation the same.

WEB /mb 8/28/81 N

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