ML20207T076

Forwards Request for Addl Info on 860825 & 870123 Proposed Mods to Tech Specs Re Rwcu.Info Re Lowest Equipment Qualification Temp & Air Temp Sensors Requested within 30 Days of Receipt of Ltr

ML20207T076
Person / Time
Site:	Hatch
Issue date:	03/19/1987
From:	Rivenbark G Office of Nuclear Reactor Regulation
To:	James O'Reilly GEORGIA POWER CO.
References
TAC-62757, TAC-62758, NUDOCS 8703230163
Download: ML20207T076 (3)

Text

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. MAR 19 1987 c,i Docket Nos.: 50-321/366 Mr. James P. 0'Reilly Sr. Vice President - Nuclear Operations Georgia Power. Company Post Office Box 4545 Atlanta, Georgia 30302

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION ON PROPOSED CHANGES T0'RWCU TECHNICAL SPECIFICATIONS'

, Re Edwin I. Hatch Nuclear Plant, Units 1 and 2 By letters of August 25, 1986 and January 23, 1987, Georgia Power Company

. proposed modifications to the Technical Specifications to Hatch Units 1 and 2 concerning the reactor water cleanup unit (RWCU). We have reviewed these proposed modifications. In order to complete this review, we need the additional information described in the enclosure. You are requested to provide a written response submitting the requested information within 30 days j of receipt of this letter.

The reporting requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not required under.P.L.96-511.

Sincerely, Odghaal sigand by George W. Rivenbark, Project Manager BWR Project Directorate #2 Division of BWR Licensing'

Enclosure:

Request for Additional Information cc: w/ enclosure See next page DISTRIBUTION eDectet Files BGrimes NRC PDR JPartlow Local PDR NThompson PD#2 Plant File GRivenbark RMBernero SNorris 0GC-Bethesda ACRS(10)

EJordan DBL:PD#2 DBL:k DBL: #2 SN s GRiv$ ark:cd ler 3/ 11 /87 ;Q /87 3/Q/7 0FFICIAL RECORD COPY 8703230163 870319 PDR ADOCK 05000321 P PDR

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i- Mr. J. P. O'Reilly Edwin I. Hatch Nuclear Plant,.

' Georgia Power Company Units Nos. I and 2 cc:

Bruce W. Chruchill, Esquire Shaw, Pittman, Potts & Trowbridge 2300 N Street, N.W.

Washington, D.C. 20037 Mr. L. T. Gucwa Engineering Department Georgia Power Company Post Office Box 4545 Atlanta,. Georgia- 30302 Nuclear Safety and Compliance Manager Edwin I. Hatch Nuclear Plant Georgia Power Company Post Office Box 442 Baxley, Georgia 31513 Mr. Louis B. Long Southern Company Services, Inc.

Post Office Box 2625 Birmingham, Alabama 35202 Resident Inspector U.S. Nuclear Regulatory Comission Route 1, Post Office Box 279 Baxley, Georgia 31513 Regional Administrator, Region II U.S. Nuclear Regulatory Comission, 101 Marietta Street, Suite 2900 Atlanta, Georgia 30303 Mr. Charles H. Badger Office of Planning and Budget Room 610 270 Washington Street, S.W.

Atlanta, Georgia 30334 Mr. J. Leonard Ledbetter, Commissioner Department of Natural Resources 270 Washington Street, N.W.

Atlanta, Georgia 30334 Chairman Appling County Comissioners County Courthouse Baxley, Georgia 31513

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b RE0 VEST FOR ADDITIONAL'INFORMATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION

' PROPOSED TECHNICAL SPECIFICATI0N'MODIFICAT10NS

,REGARDING THE RWCU HATCH UNITS 1 AND 2 DOCKET N05. 50-321 AND 366

1. T'he submittal dated August 25, 1986 indicates that the lowest equipment qualification tenperature for safety related components or systems in the RWCU rooms is 157*F. However, the January 23, 1987 submittal indicates this temperature to be 151'F. Indicate which temperature correctly identifies the lowest equipment qualification temperature.

2. Provide a discussion of the air temperature sensors in each RWCU room with respect to meeting the single failure criterion, including the power supplies, the routing of the wiring, types of sensors, and instrumentation.

3. Provide a discussion and the results of an analysis, using the maximum room ambient temperature specified in the plant technical specifications, of the potential environmental conditions in each of the RWCU rooms.

Assume that one sensor is inoperable and that the pipe failure is located at the farthest distance and is pointed away from the operable sensor.

Assuming that the operable sensor initiates a signal at the proposed temperature setting of 150'F, specify the time delay from reaching the setpoint to closure of the isolation valves. Specify the peak room temperature. Provide a discussion as to why exceeding the safety related components' equipment qualification temperature by the amount identified in your analysis should be acceptable for each component.

4. The January 23, 1987 submittal states that by using the guidelines of Regulatory Guide 1.105, the maximum allowable air temperature setpoint is 151*F. The licensee has proposed a setpoint of 150*F. Provide a

, discussion of the uncertainties and instrument drift histories which supports a safety margin of l'F.

5. Provide a description of the surveillance and calibration program, frequencies, and historical as-found condition of the sensors and the instrumentation for the RWCV-leakage detection systems.

, 6. Provide a listing of the inadvertent RWCU isolation experienced at Hatch 1 & 2. The list should specify the date of the isolation, referenced LER number, cause and solution of the high ambient temperature signal, and the net effects on plant operation (such as lost power generation, failed fuel, offsite releases of radioactivity, or other effects on the health and safety of the public). Provide a discussion as to why raising the ambient temperature setpoint is a better solution than fixing the cause of the high temperatures.

7. Provide a discussion of effects of higher operating temperatures on the ability of plant personnel to perform maintenance and surveillance testing on the equipment in the RWCU rooms.

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