ML20126F760

Discusses Status of GE Nuclear Energy Advanced BWR Shutdown Risk Draft FSER

ML20126F760
Person / Time
Site:	05200001
Issue date:	12/23/1992
From:	Poslusny C Office of Nuclear Reactor Regulation
To:	Marriot P GENERAL ELECTRIC CO.
References
GL-88-17, NUDOCS 9212310122
Download: ML20126F760 (3)

Text

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l December 23, 1992 Docket No.52-001 Mr. Patrick W. Marriott, Manager Licensing & Consulting Services GE Nuclear Energy 175 Curtner Avenue San Jose, California 95125

SUBJECT:

STATUS OF GE NUCLEAR ENERGY (GE) ADVANCED BOILING WATER REACTOR (ABWR) SHUTDOWN RISK DRAFT FINAL SAFETY EVALUATION REPORT _(DFSER)

The Reactor Systems Branch (SRXB) is currently finalizing its safety evalua-tion report on the subject identified above. The reviewers have identified some potential open issues below, which require early dialogue with GE.

1. Reliability of power available for reactor water cleanup (RWCU) system to measure coolant temperatures. This open item regards the method used to measure water temperature at the residual heat removal (RHR) pump dis-charge and the RWCU system suction lines, in case of loss of all power.

2. Adequacy of the decay heat removal (DHR) system parameters monitored by the ABWR instrumentation system. This open item regards the potential applicable of the GL 88-17's recommendations for RHR system indications (e.g., pump noise, pump suction pressure, motor current, alarms, etc.).

3. GE operating procedure guidelines for conducting outage and planning.

4. Shutdown technical specifications for the ABWR.

5. Potential impact on inflatable seals due to temperature increase from loss of DHR cooling during reactor internal pumps replacement or maintenance.

6. Discussion of a director reactor pressure vessel boiling to the contain-ment as an acceptable alternate decay heat removal method.

7. Impact on safety-related equipment from heavy loads and fuel handling in the containment during the refueling process.

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Mr. Patrick W. Harriott: . December 23, 1992-In addition, the reviewers have identified two confirmatory items:

1. Modification of a high temperature isolation feature to only isolate and; bypass the filter demineralizers rather than the entire RWCU. .This .

-confirmatory item regards the potential degrading of the RWCU system if the coolant inlet temperature to the iron exchanger exceeds the resin's design temperature.

2. Modification of a manually-operated RWCU bottom drain suction valve to remote / manual air-operated valve function. This confirmatory item regards the diverse capability for operators to isolate'line breaks from the control room.

Please provide this list to cognizant GE staff and contact me during the week of January 4, 1993, so that I can arrange a preliminary phone call and meeting, if necessary, to quickly resolve these concerns. I still expect evaluation inputs on shutdown risk from the Containment Systems and Severe Accident, Plant Systems, and Probabilistic Safety Assessment Branches in the near future. I will provide feedback to you next month if additional open items are identified.

Sincerely, (Original signed by)

Chester Poslusny, Project Manager Standardization Project Directorate Associate Directorate for-Advanced Reactors and License Renewal Office of Nuclear Reactor Regulation cc: See next page QISTRIBUTION:

Docket File PDST R/F DCrutchfield Wiravers PDR WRussell, 12G18 RPierson JNWilson CPoslusny TBoyce PShea' GGrant , -'17G21 RJones, 8E23 JMoore, 15B18 ACRS (10 -MRubin,>8E23-r%_ g_>

0FC: LA:PDST:ADAR PM:PDST:fDAR SCdDfT:ADAR-f D:PDSf:ADAR NAME: PShea g CPosluEyitz JkW(Ison

'RPihon DATE: 12(fy/92 12/23/92- 12/d/92 12/N/92

.0FFICIAL RECORD COPY: DOCUMENT NAME: SRDFSER.CP

1* .

GE Huclear Energy Docket No.52-001 cc: 4',r Robert Mitchell Mr. Joseph Quirk General Electric Company GE Nuclear Energy 175 Curtner Avenue Mail Code 782 San Jose, California 95114 General Electric Company 175 Curtner Avenue Mr. L. Gifford, Program Manager San Jose,-California 95114 Regulatory Programs GE Nuclear Energy 12300 Twinbrook Parkway Suite 315 Rockville, Maryland 20852 Director, Criteria & Standards Division Office of Radiation Programs V. S. Environmental Protection Agency 401 M Street, S.W.

Washington, D.C. 20460 Mr. Daniel F. Giessing U. S. Department of Energy NE-42 Washington, D.C. 20585 Mr. Steve Goldberg Budget Examiner 725 17th Street, N.W.

Room 8002 Washington, D.C. 20503 Mr. Frank A. Ross U.S. Department of Energy, NE-42 Office of LWR Safety and Technology 19901 Germantown Road Germantown, Maryland 20874 Mr. Raymond Ng 1776 Eye Street, N.W.

Suite 300 Washington, D.C. 20006 Marcus A. Rowden, Esq.

Fried, Frank, Harris, Shriver & Jacobson 1001 Pennsylvania Avenue, N.W.

Suite 800 Washington, D.C. 20004 Jay M. Gutierrez, Esq.

Newman & Holtzinger, P.C.

1615 L Street, N.W.

Suite 1000 Washington, D.C. 20036 1

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