U-602785, Provides Suppl to Which Provided 120-day Response to GL 96-06, Assurance of Equipment Operability & Containment Integrity During DBA Conditions. Util Intends to Modify Penetrations During Next Refueling Outage
| ML20196H713 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 07/24/1997 |
| From: | Romberg W ILLINOIS POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-96-06, GL-96-6, U-602785, NUDOCS 9707310055 | |
| Download: ML20196H713 (3) | |
Text
s
%nois Power Company l
Clinton Power Station s
P O Box 678 Clnton,IL 61727 Tel 217 9354 220 Fax 217 9354632 l
P(pMR au y 24, 1997 Wayne D. Romberg Assistant Vice President Nuclear i
w.,- cmany U-602785 8G.120 Docket No. 50-461 1
Document Control Desk U.S. Nuclear Regulatory Commission Washing' ton, D.C. 20555
(.
Subject:
Illinois Power's (IP's) Supplement of the 120-Day Response l
to Generic Letter (GL) 96-06, " Assurance of Equipment Operability and Containment Integrity During Design-Basis Accident Conditions" l
Dear Madam or Sir:
f The purpose of this letter is to provide a supplement to IP letter U-602686, l
' dated January 28,1997. IP letter U-602686 provided IP's 120-day response to GL 96-06. In that letter, penetration IMC-086 was identified as not being susceptible to overpressurization. After further review, it has been determined that this penetration could be susceptible to overpressurization as described in GL 96-06.
1 l
Penetration 1MC-086 contains the Reactor Water Cleanup (RWCU) system to main condenser blowdown line. Thejustification to exclude this penetration in IP's previous letter was that the RWCU system is at high temperature and pressure during operation and would cool under Loss-of-Coolant Accident (LOCA) conditions.
However, this line is normally used only during startup to remove excess reactor vessel inventory to the condenser. As such, after this line is isolated the reactor water contained in the penetration could be relatively cool and would subsequently heat up and expand during a LOCA.
)
l In IP's January 28,1997 letter, operability for penetrations IMC-050, 065, 069,
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l 070,103, and 104 was determined using measured valve leakage. Penetration 1MC-i 086 is now included in this category. Analyses for these seven penetrations show the current measured containment isolation valve leakage to be sufficient to prevent overpressurization. However, since these analyses are based on current leakage rates, l
reevaluation will be required each time new leakage data is obtained or if maintenance is f
l performed that could affect the leakage rate. To eliminate this need for continued I
monitoring and reanalyzes, IP intends to modify these penetration
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refueling o*c;e (RF-7).
9707310055 970724
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Attachment I provides an affidavit supponing the facts set forth in this letter.
l Sincerely yours, 1
hW Wayne D. Romberg Assistant Vice President l
JSP/krk i
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Attachment l
cc:
NRC Clinton Licensing Project Manager NRC Resident Office, V-690 i
i Regional Administration, Region III, USNRC Illinois Depanment ofNuclear Safety i
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I Attachment I to U-602785 l
Wayne D. Romberg, being first duly sworn, deposes and says: That he is Assistant Vice President at Illinois Power; that this letter supplying information for Generic Letter 96-06 has been prepared under his supervision and direction; that he knows the contents i
thereof; and that to the best of his knowledge and belief said letter and the facts contained therein are true and correct.
This 2f day ofJuly 1997.
Date:
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S.igned:
Wayne D. Romlierg STATE OF ILLINOIS l SS.
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Jacquaine S.MaiNas COUNTY J Notary Putsc,SWe of Innels ulA My CommissionEgkes11/N/97 n========::
Subscribed and sworn to before me this N day ofJuly 1997, i
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/} (Notary Public) /
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