ML17329A039

Responds to Ltr Re Importance of NRC Info Notice 91-022. Highlights Steps Taken to Ensure Personnel Maintian High Level of Awareness of Potential for Causes of Shutdown Risks Described in Notice

ML17329A039
Person / Time
Site:	Cook
Issue date:	05/03/1991
From:	FITZPATRICK E AMERICAN ELECTRIC POWER CO., INC., AMERICAN ELECTRIC POWER SERVICE CORP.
To:	MURLEY T E Office of Nuclear Reactor Regulation
References
IEIN-91-022, IEIN-91-22, NUDOCS 9106070303
Download: ML17329A039 (8)

Text

ACCELERATED DI UTION DEMONSTRATION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)ACCESSION NBR:9106070303 DOC.DATE: 91/05/03 NOTARIZED:

NO DOCKET FACIL:50-315 Donald C.Cook Nuclear Power Plant, Unit 1, Indiana&05000315 50-316 Donald C.Cook Nuclear Power Plant, Unit 2, Indiana&05000316 AUTH.NAME AUTHOR AFFILIATION FITZPATRICK,E.

American Electric Power Co., Inc.FITZPATRICK,E.

American Electric Power Service Corp.R RECIP.NAME RECIPIENT AFFILIATION MURLEY,T.E.

Office of Nuclear Reactor Regulation, Director (Post 870411

SUBJECT:

Responds to ltr re importance of NRC Info Notice 91-22.Highlights steps taken to ensure personnel maintian high level of awareness of potential for causes of shutdown risks described in notice.DISTRIBUTION CODE: AOOID COPIES RECEIVED:LTR 2 ENCL 2 SIZE: TITLE: OR Submittal:

General Distribution NOTES: D D RECIPIENT ID CODE/NAME PD3-1 LA COLBURN,T.

INTERNAL: NRR/DET/ECMB 7D NRR/DOEA/OTSB11 NRR/DST/SELB 7E NRR/DST/SRXB 8E OC/LFMB 01 EXTERNAL NRC PDR COPIES LTTR ENCL 1 1 2 2 1 1 1 1 1 1 1 1 1 0 1'1 1 RECIPIENT ID CODE/NAME PD3-1 PD NRR/DET/ESGB NRR/DST 8E2 NRR/DST/SICB8H7 NUDOCS-ABSTRACT OGC/HDS2 RES/DSIR/EIB NSIC COPIES LTTR ENCL 1 1 1 1 1 1 1 1 1.1 1 0 1 1'1 D NOTE TO ALL"RIDS" RECIPIENTS:

D D PLEASE HELP US TO REDUCE WASTEI CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT.20079)TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISIS FOR DOCUMENTS YOU DON'T NEED!TOTAL NUMBER OF COPIES REQUIRED: LTTR 18 ENCL 16 0 I 1,'~'I g gf 4<<p=-e 5 B t t~I I (P~American Eiectric Po Service Corporation 1 Riverside Plaza Columbus, OH 43215 SlÃMICNM KE,MR'NEC PO5ÃPQ Dr.T.E.Huxley Director of Nuclear Reactor Regulation', U.S.Nuclear Regulatory Commission Washington, D.C.20555 m-si5/3'ay 3, 1991

Dear Dr.Hurley:

E.E.Fitzpatrick Vice President Nuciear Operations 614 223 2010 In response to your letter regarding the importance of NRC Information Notice 91-22, I would like to highlight the steps taken to ensure that Cook Nuclear Plant personnel maintain a high level of awareness of the potential for and causes of the shutdown risks described in the notice.I, too, am concerned about, the types of events described in the notice and have issued an internal memorandum that emphasizes the importance of this issue.Plant management also recognizes the importance of shutdown risk assessment.

Whi;le measures have, been taken to reduce shutdown risks in the past (unloading the core for the duration of the outage, for example), we have recently instituted formalized practices as a result of our review of the information notice and in preparation for a recent short, planned outage.These efforts include measures to ensure that plant personnel remain aware of the potential for events to occur during outage conditions and precautions to ensure that the probability of such events is significantly reduced.Because the recent short outage dealt with the inspection and minor repair of a main transformer, we were particularly interested in maintaining high awareness of the potential for loss of power.The Cook Nuclear Plant outage management team was briefed regarding events involving loss of AC power while shutdown and was given copies of pertinent notices and event reports from NRC and INFO.The safety and assessment department, as a result of their review of NRC information notices and INPO significant event reports, published lists detailing AC power supplies and available backup power supplies required by the technical specifications, the technical specifications impact on expected system outages, and recent industry events involving loss of AC powex while shutdown.Additionally, a shutdown risk profile was published and reviewed daily.A pictorial representation of the status of critical equipment was provided and discussed each morning during the outage to reinforce further its importance to safety.An example of the pictoxial representation is attached.9106070303 910503 PDRADOCK 05000315 9 PDR k~

~~4>>~Dr.T.E.Murley Page 2 May 3, 1991 In addition, the plant manager issued directives requiring plant manager approval of all non-routine activities within the switchyard and requiring that an additional power supply above those required by the technical specifications be maintained throughout the outage.During the outage, the roadway leading to the preferred off site power supply transformers was closed and the transformer area was cordoned off to limit access.Concrete barriers were installed to protect reserve transformers from inadvertent impact and a designated spotter was required during any crane movement in the transformer area.The outage management team periodically inspected the transformer arid diesel generator air intake areas for safety hazards, loose debris, and fire hazards.As an added precaution, prior to removing a diesel generator train from service for maintenance, the opposite train's diesel generator was run to verify its operability.

This verification was in addition to any technical specification requirements.

A Cook Nuclear Plant shutdown issues task force has been convened to examine issues affecting plant safety during shutdown.Areas such as reactivity control, decay heat removal, and reactor vessel protection are being examined to determine the adequacy of our current practices and to suggest improvements.

The task force is represented by personnel from a variety of departments including operations, outage planning, maintenance, nuclear safety and licensing, and shift technical advisors.In addition, the plant manager is a member of the NUMARC shutdown risk assessment team.We intend to continue the practices described above and to implement, through formal procedure, the recommendations resulting from the plant shutdown issues task force.The result of these controls is that the issues surrounding non-routine plant configurations remain in the foreground during plant outages.It is our intent to, and our belief that these measures will, prevent the types of events described in Information Notice 91-22 from occurring at Cook Nuclear Plant.If you require additional information regarding Cook Nuclear Plant practices, please contact me.Sincerely, rdh Attachment

~~~p~I'V D.C.COOK NUCLEAR PLANT CRITICAL PARAMETERS 4/25/91 REACTOR COOLANT SYSTEM INVENTORY EMERGENCY DIESEL GENERATORS BORATION FLOW PATH ESW PUMPS UNACCEPTABLE REGION CHARGING PUMPS PUMPS','+'+'+'POWER SOURCES'HR PUMPS Parameter Acce table Ran e RCS Inventory (621-614 ft)Bora tion Flow Paths Avail (l-2)Charging Pumps Avail (1-2)Off Site Power Sources (1-2)RHR Pumps Operable (1-2)CCW Pumps Operable (1-2)ESW Pumps Operable (1-2)Diesel Generators Operable (1-2)No.>621 ft 2 1 2 2 2 1 2 Comments PZR>17%level WEST Pump Out of S'ervice EAST Pump Out of Service STATUS OF CHANGES: West CCP has been Removed from Service to Leak Test CS-299W t~e~0~~~0