ML20245L026
| ML20245L026 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 06/26/1989 |
| From: | Galle D COMMONWEALTH EDISON CO. |
| To: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 0184T, 184T, NUDOCS 8907050347 | |
| Download: ML20245L026 (3) | |
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' C mm::nw::alth Efison Z.9 72 West Adams Street, Chicago, Illinois 1!
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3 X6 dress Reply to: Post Of' ice Box 767~
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, Chicago, Illinois 60690 - 0767 a
June 26, 1989 PRIORITY ROUTING' First Set Md I
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FILE M Mr..A.
Bert Davis
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Regional Administrator U.S. Nuclear Regulatory Commission i
Region III 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Quad Cities Station Unit 1 Recirculation Pump Seal Monitoring and Action Plan NRC Docket No. 50-254 References June 22, 1989 Conference Call between CECO.
- i (R. Bax, G. Spedl, et al.) and Region III (W. Shafer, J. Harrison, R. Higgins).
Mr. Davis As requested by Mr. W.D.
Shafer, enclosed is the Ound Cities monitoring and action plan for the inboard seal on Recirculation Pump 1B..
As-1 discussed in the referenced conference call, this' seal is experiencing some-degradation as indicated by a gradual increase in pressure (between the inboard and outboard seals) which has occurred over several weeks from a normal pressure of about 500 psi to a value of'approximately 680 psi.- The seal pressure trend has remained relatively constant with the pressure ranging.
.i from 660 psi to 700 psi, depending on load, since June 20, 1989. This situation has been closely monitored by the station including regular discussions of the seal status / trend at the morning Plan-of-the-Day meetings since June 12, 1989.
In addition, the Corporate Office has been involved in the discussions with the Station regarding the seal and has monitored the seal status since' June 12, 1989.
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All data to date has indicated that only the first (inboard) seal has.
been affected. The gradual pressure increase is. consistent with previous-experience of over ninteen (19) years at Quad Cities where Recirculation Pump
.j Seal degradation has been manageable. via close monitoring and. planned replace-ment during a scheduled outage. There has been only one Recirculation Pump-l Seal failure, requiring immediate action, in Quad' Cities Stations operating, 1
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l history which occurred in the early 1970's during initial operation.
i Further, it's important to note that the pump manuf acturer was also consulted and indicated that previous recommendations remain appropriate for this type of seal behavior. These recommendations permit operation to continue f
up to a seal cavity pressure of 1000 psi.
Additionally, General Electric, the i
Nuclear Steam System Supplier, has also reviewed the seal condition and they
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Independently arrived at the same conclusion as the vendor.
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As a result of input received from your staff in the referencti conference call, the enclosed action plan was developed.
In addition to the provisions of the enclosed action plan, Commonwealth Edison would like to emphasize that it was our intention to replace this seal at the earliest feasible opportunity. That is, the seal w!11 be replaced during the next regularly scheduled or unplanned outage of sufficient duration even if the action plan's replacement threshold has not yet been reached.
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During the referenced conference call, the Clinton Unit 1 and Millstone Unit 1 recirculation pump seal f ailures were discussed. Commonwealth Edison would like to point out that we believe that the present seal degrada-tion at Quad Cities is not similar to that experienced at Millstone and Clinton. Current seal degradation characteristics are similar to the characteristics experienced in the past due to normal service life expiration of the seal.
CECO, therefore, believes that the approach, as described in the attached plan, is prudent and responsive to the staff concerns.
If you have any questions regarding this matter, please contact me or 3
N. J. Kalivianakis of this office.
Very truly yours, QM @
l' L6 f D. P.
Galle Vice President, BWR Operations Im Attachment cc T.M.
Ross - Project Manager, NRR R.L. Higgins - Senior Resident Inspector, Quad Cities
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s A7TACHMM7 OUAD CITIES 1B RECIRCULATION PUMP SEAL MOH1TORING_AND_FIEQRTlHG ACTIOILP1AH REOUIRED OPERATOR ACTIQN i
1.
Due to the apparent degradation of IB recirculation pump No. I seal, for the 1B pump starting immediately and until the pump seal is replaced, perform the following monitoring a.
On QOA 202-S1, record the drywell equipment sump gallons pumped every four hours.
b.
On QOA 202-S1, record the IB inboard and outboard seal temperature readings every four hours.
c.
On QOA 202-S1, record the IB seal pressure readings every four hours.
2.
For an increasing trend in the drywell/ equipment sump gallons pumped every four hours, or for an unexplained increasing trend in the inboard or outboard seal temperature readings taken every four hours, notify the station on-call duty person who will determine other notifications necessary and any corrective action to be taken.
i 3.
When the No. 2 seal pressure of the IB recirculation pump reaches 700 psig, and at 50 psig increments after 700 psig:
J a.
Notify the station on-call duty person.
b.
The station on-call duty person will notify the Station Manager.
c.
The Station Manager will notify either the BWR General Manager l
(Kalivianakis) or the Vice President (Galle).
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d.
The Corporate Office will notify the NRC of the pressure indication of the seal and any proposed corrective action decided upon.
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