ML17332B005

Informs NRC of Intent to Withdraw Previous Commitment Re Chlorine Detection

ML17332B005
Person / Time
Site:	Cook
Issue date:	11/01/1995
From:	Fitzpatrick E INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
AEP:NRC:0398AB, AEP:NRC:398AB, NUDOCS 9511080288
Download: ML17332B005 (4)

Text

PRIORITY (ACCELERATED RIDS PROCESSING) 0 DISTRIBUTION CODE:

A003D COPIES RECEIVED:LTR I

ENCL 0 SIZE:

TITLE: OR/Licensing Submittal:

Suppl 1 to NUREG-0737(Generic Ltr 82-33)

NOTES REGULATORY INFORMATION DISTRXBUTION SYSTEM (RIDS)

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ACCESSION NBR: 9511080288 DOC. DATE: 95/11/01 NOTARIZED: NO DOCKET FACIL:50-315 Donald C.

Cook Nuclear Power Plant, Unit 1, Indiana M

05000315 p

50-316 Donald C.

Cook Nuclear Power Plant, Unit 2, Indiana M

05000316 AUTH.NAME AUTHOR AFFILIATION FXTZPATRICK,E.

Indiana Michigan Power Co. (formerly Indiana S Michigan Ele RECIP.NAME RECIPIENT AFFILIATXON Document Control Branch (Document Control Desk)

I

SUBJECT:

Informs NRC of intent to withdraw previous commitment re chlorine detection.

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Indiana Michigan Power Company PO Box 16631 Columbus, OH 43216 lNOlANA NlCHIGAN PQWKR November 1,

1995 Docket Nos.:

50-315 50-316 AEP:NRC:0398AB U.

S. Nuclear Regulatory Commission ATTN:

Document Control Desk Washington, D.

C.

20555 Gentlemen:

Donald C.

Cook Nuclear Plant Units 1 and 2

MODIFICATION OF COMMITMENT REGARDING CHLORINE DETECTORS Pursuant to a discussion with the NRC staff on October 24,

1994, the purpose of this letter is to inform you of our intent to withdraw a previous commitment regarding chlorine detection.

Our letter AEP:NRC:0398C, dated February 9,

1981, committed to installing chlorine detectors in the control room ventilation systems for the Donald C.

Cook Nuclear Plant.

The chlorine detectors were installed in response to NUREG 0737, Item III;D.3.4, "Control Room Habitability."

The need for the detectors was based on toxic gas analyses performed for NUREG 0737 Item III.D.3.4, that relied on chlorine detection to demonstrate that habitable conditions could be maintained in the event of a toxic gas release.

Subsequent to submittal of AEP:NRC:0398C and installation of the chlorine detectors, other analyses were performed as part of the probabilistic risk assessment (PRA) for Cook Nuclear Plant.

All hazardous materials stored within the Cook Nuclear Plant site boundary were examined for control room habitability concerns.

It was concluded that the materials stored within the site boundary present no threat to plant safety, as release of these materials will not incapacitate control room personnel or force a reactor shutdown.

Toxic chemical release and overpressure from either local industrial accidents or hazardous materials transportation accidents were also addressed in the PRA.

The frequency of core damage and/or radiological release in excess of that allowed by 10 CFR 100 as a result of any off-site hazardous materials accident was determined to be insignificant.

None of these analyses took credit for the presence of the chlorine detectors.

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~U'.~S. Nuclear Regulatory Commission Page 2

AEP:NRC:0398AB The existing chlorine detectors are becoming obsolete and are no longer supported by the vendor.

The detectors malfunction often, requiring frequent maintenance and distracting the operators.

Since the detectors are no longer necessary to demonstrate that habitable conditions can be maintained in the event of a toxic gas release, it is our intention to disable the system permanently.

This will be accomplished as part of our normal design change

process, under the provisions of 10 CFR 50.59.

Since the chlorine detectors only provide an alarm function, there will be no other impact on the control room ventilation system.

EZ pm+

E.

E. Fitzpatrick Vice President pit CC'.

A. Blind G. Charnoff H. J. Miller NFEM Section Chief NRC Resident Inspector

- Bridgman J.

R. Padgett