ML19332F006
| ML19332F006 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 11/28/1989 |
| From: | Chrzanowski A COMMONWEALTH EDISON CO. |
| To: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19332F005 | List: |
| References | |
| 17810, NUDOCS 8912130267 | |
| Download: ML19332F006 (2) | |
Text
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Commonwealth Edb:n i,
x, Zen Generating St: tion
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101 Shiloh Blvd.
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Zion, Illinois 60099
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Telephone 312/746 2004 -
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i November 28. 1989 Mr. A. Bert Davis Regional Administrator
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U.S. Nuclear Regulatory Commission i
Region III
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t 799 Roosevelt Road Glen Ellyn. IL 60137 u
Subject:
Zion Nuclear Power Station, Unit 2 License Number DPR-48 i
Request For Enforcement Discretion-
"0" Diesel Generator Operability Requirements.
NRC DotLtLNo 50-304
Reference:
November 28, 1989 telephone conversation between T. Joyce and J. O. Smith
Dear Mr. Davis:
t The purpose of this letter is to request a relief from a Technical Specification (TS) Limiting Condition For Operation by using the guidance outline in the " Enforcement Discretion" process.
Specific reitef is requested e
from the requirements of Zion Station TS 3.15.2.C.
This letter confirms the commitment that was made during the course of the November 28, 1989 telephone conversation.
On Tuesday November 28, 1989, Unit 2 was operating at power with "0" Diesel Generator (DG) inoperable due to completion of repairs to the #2 connecting rod bearing.
The "0" DG had been declared inoperable at 0715 tours on November 22, 1989.
This condition placed the unit on a 7 day clock to 6 lot Shutdown.
The specific purpose of this request is to allow an extension of the 7 days to Hot Shutdown clock by 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
This additional perlod of time is necessary in order to perform the required Technical Specification operability run (PT-11) and a post-run evaluation.
If at this time, the "0" DG cannot be declared operable, Unit 2 will be placed in Hot Shutdown by 1515 hours0.0175 days <br />0.421 hours <br />0.0025 weeks <br />5.764575e-4 months <br /> on November 29, 1989.
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Zion Station requests temporary relief in this circumstance based on the following reasons:
- 1) The undesirable stress of the shutdown transient will be avoided. 2) The *0" DG operability run will be in progress by 0715 hours0.00828 days <br />0.199 hours <br />0.00118 weeks <br />2.720575e-4 months <br /> on i
November 29, 1989 or the Unit will be placed in Hot Shutdown, 3) During the operability run, the "0" DG is capable of providing emergency power to its j
associated safeguard bus should it be required.
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The following is a brief summary of the events leading up to the need for the additional extension of time:
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On November 22,1989 at 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br />, the "0" DG received a high connecting rod bearing temperature alarm during performance of pT-10. Safeguard Actuation Test.
Upon inspection, it was discovered that the #2 upper and lower connecting rod bearing shells were found with excessive babbit wear.
Nhile performing maintenance on the connecting rod bearing, oil samples 1 !
were taken on the crankcase lube oil system.
The results of the oil analysis determined that jacket water had entered into the lobe oil system.
The jacket water leaks were determined to be coming from the
, j cylinder heads.
Therefore, the 16 cylinder head. liner-to-block gaskets i
were replaced.
The scope of the above described work was within the 7 day 3
Technical Specificatinn time clock. As a common maintenance practice after j
s performing work on the jacket water system, a jacket water leak test is performed. On Noven,ber 27, 1989, at approximately 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br />, the jacket t
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water leak test was performed and two additional jacket water leaks into l
the crankcase lobe oil system were discovered.
The leaks were determined l
to be coming from the #1 cylinder wrinkle belly.
The wrinkle belly gaskets i
were replaced and the jacket water leak test was repeated, Additional water was found to be coming from the wrinkle belly-to-cylinder liner 3
i oint. At this time, the c linder liner was inspected and a casting
[l nconsistency was found.
T e cylinder liner has been replaced and the i
jacket water leak test will be repeated.
The cylinder liner replacement is (l.
l the reason for the request for Enforcement Discretion.
t Throughout the "0" DG outage period Commonwealth Ulson Company utilized
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corporate nuclear engineering diesel experts and two dicsel generator experts I
from the Byron Station to assist in the investigation.
Cooper Bessemer technical representatives were on site and involved in the repairs on all j
shifts. Work was performed 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> a day from the initiation of the Technical Specification time clock on November 22, 1989.
The leaks associated with the jacket water system were not reasonably foreseen by Zion Station personnel.
The repairs are in progress and will be completed in a relatively short period of time.
t If you have any further questions regarding this matter, please contact
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this office.
Very truly yours, fk h 0NWh R.lA.-
rzanowski n
e Nucle r 1.icensing Administrator
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cc: J. Hinds - Region Ill I
C. Patel - NRR f
l J. D. Smith - Zion SRI l
17810 i
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