United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #: 9710210065


October 16, 1997


Document Control Desk

ATTN:  Chief, Planning, Program and Management Support Branch

U.S. Nuclear Regulatory Commission

Washington, D.C. 20555

Interim Report of Evaluation of a Deviation Pursuant to 10 CFR 21.21


The following information is provided pursuant to the requirements of 10

CFR 21 to submit an interim report on issues that will not be completed

within 60 days of discovery.

One interim report is enclosed for the following issue under evaluation

by Siemens Power Corporation:

     97-009         "Transient Analyses at Exposures Prior to EOC"

If there are any questions, please contact me.

Very truly yours,

J. S. Holm, Manager

Product Licensing



cc:  E. Y. Wang (NRR/DRPM/PECB)

Siemens Power Corporation

Nuclear Division              2101 Horn Rapids Road  Tel: (509) 375-8100

Engineering & Manufacturing   P.O. Box 130           Fax: (509) 375-8402

                              Richland, WA 99352-0130

                         Interim Report (97-009)


Interim report of evaluation of a deviation pursuant to 10 CFR 21.21



Transient Analyses at Exposures Prior to EOC.

Identification of Basic Activity:

BWR Transient Analyses

Basic Activity Supplied by:

Siemens Power Corporation - Nuclear Division

Nature of Deviation:

BWR Transient analysis results (delta-CPR) at EOC may not always be

limiting for the entire cycle.

Discovery Date:

August 18, 1997

Corrective Actions to Date:

Nonconformance report (NCR 6230) was prepared and processed by the

management review team.  INPO operating experience report (OE 8422)

indicated that transient analysis results at end-of-cycle (EOC) might not

always be limiting for the entire cycle.  The SPC evaluation indicates

that normal operation limits (i.e. no equipment out of service) remain

applicable at all plants for which SPC has licensing responsibility.

Some plants have operating limits that support operation in various

equipment out of service (EOOS) scenarios.  A review of the impact of

cycle exposure on the EOOS operating limits is ongoing.  The only plant

operation potentially affected by this ongoing EOOS evaluation is LaSalle

Unit 2 Cycle 8.  Preliminary results indicate that the only situation

where the current limits may not provide adequate protection is operation

below 30% power with the turbine

bypass valves inoperable.  LaSalle Unit 2 Cycle 8 is not expected to

start up until spring of 1998.  However, should the plant start up prior

to the completion of the evaluation, administrative limits have been

provided to ensure LaSalle safety limits are protected.

Evaluation Completion Schedule Date:

December 15, 1997


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