ML20148G290

Forwards Table of General Guidelines for Operator Action for Severe Weather as Clarification of Intent of NRC 870922 SER Re Winds & Tornado

ML20148G290
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	03/25/1988
From:	Frisch R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NUDOCS 8803290091
Download: ML20148G290 (3)

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Consumers

@ POWEJtRNG POWar AtA0NREAAr$ PYtDSitE55 oeneral offices: 1945 West Parnell Road. Jackson, MI 49201 e (517) 78b0550 i

March 25, 1988 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 )

l DOCKET 50-155 - LICENSE DPR BIG ROCK POINT PLANT -

WINDS AND TORNADO SAFETY EVALUATION REPORT CLARIFICATION OF INTENT i

Nuclear Regulatory Commission letter dated September 22, 1987' transmitted the i NRC staff Safety Evaluation Report for the Winds and Tornado Safety Evaluation  !

Report (SEP) issue at Big Rock Point. Plant Review Committee review of the report has raised some concerns regarding our understanding of the agreements reached during NRC review of this issue that appear to have resulted in an l I

inaccurate statement in the Safety Evaluation Report.

Item 4.(5) of the Safety Evaluation Report states "CPC is modifying the Big Rock Point Plant operating procedures to require plant cooldown or shutdown, and manning the alternate shutdown building if grid disturbances occur, a tornado warning is broadcast for the area, or a tornado is sighted in the area." A literal reading of this item could be conse. rued to mean the plant would be shut down in the event a tornado warning is broadcast for the general I area surrounding the Big Rock Plant. It also could be construed that our procedure on severe weather is being modified to include this plant shutdown.

This is not the case as shown in the attached Table of Guidelines from the procedure. The severe weather procedures were modified at the time of our February 13, 1987 Winds and Tornado Analysis submittal to require the Alternate Shutdown Building be manned for certain severe weather phenomena such as high winds or a tornado warning. Plant snutdown would only occur if l conditions further degraded (such as a tornado is approaching or sighted in the immediate vicinity of the plant). During NRC staff review of this issue, a telephone conference call with the NRC reviewers found the guidance to man the Alternate Shutdown Building when a tornado warning is broadcast for the general area and to begin a plant shutdown when a tornado is approaching or f0\

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. Nuclear Regulatory Commission 2 Big Rock Point Plant Wind-& Tornado - Clarification March 25, 1988 sighted in the immediate vicinity of the plant to be acceptable. This is also our understanding of the intent of Item 4.(5) of the _ Safety, Evaluation Report.-

This_ submittal is provided to prevent a future' misunderstanding of this issue.

AA &

Ralph R Frisch Senior Licensing Analyst CC Administrator, Region III, NRC NRC Resident Inspector - Big Rock Point Plant Attachment l

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TABLE OF GENERAL GUIDELIt'ES FOR OPERATOR ACTION FOR SEVERE WEATHER Wind Speed / Conditions Operator Response Basis Steady winds > 60 mph Man the Alternate Shutdown Wind speed at which or a tornado warning Building (ASDB) someone can walk to the ASDB Steady winds > 80 mph Insure ASDB is manned Original design basis or indication of grid for plant structures instabilities Reduce power to a level at which load rejection can be maintained (approximately 40 MWe)

Start the emergency diesel generator Steady winds > 100 mph Initiate orderly plant Damage to the Turbine or observation of a shutdown Building can be tornado approaching expected above this site or damage to more Insure EDG started wind speed vulnerable structures (Screenhouse, EDG Room Insure ASDB manned or Service Building)

Establish the Emergency Condenser Damage to the Consrol Transfer control to the Possible loss of Room or Station Power alternate area via emergency shutdown Room procedure EMP-3.10, Fires equipment due to Control Room or Insure that the Emergency Station Power Room Condenser is established equipment damage Insure EDG started Insure reactor tripped OC0388-0074-NLO4